ASPIN Publications

LEO PNT frameworks for non-cooperative satellites with poorly known ephemerides: open-loop SGP4, tracking, and differential
Z. Kassas and J. Saroufim
IEEE Aerospace and Electronic Systems Magazine, 2024, submitted

On the fundamental tracking performance and design considerations of radio navigation
S. Kozhaya and Z. Kassas
IEEE Journal on Selected Areas in Communications, 2023, submitted

LEO satellite orbit prediction via closed-loop machine learning with application to opportunistic navigation
Z. Kassas, S. Hayek, and J. Haidar-Ahmad
IEEE Aerospace and Electronic Systems Magazine, 2023, submitted

Cognitive sensing and opportunistic navigation with unknown terrestrial and non-terrestrial signals
Z. Kassas, M. Neinavaie, J. Khalife, S. Shahcheraghi, and J. Saroufim
IEEE Signal Processing Magazine, 2023, submitted (special issue)

A first look at the OneWeb LEO constellation: beacons, beams, and positioning
S. Kozhaya and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2023, submitted

Aircraft navigation in GNSS-denied environments via radio SLAM with terrestrial signals of opportunity
Z. Kassas, N. Khairallah, J. Khalife, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
IEEE Transactions on Intelligent Transportation Systems, 2023, submitted

Autonomy for sustainability: An AESS vision and perspective
E. Cianca, J. Dauncey, G. Fasano, Z. Kassas, W. Nel, and M. Ruggieri
IEEE Aerospace and Electronic Systems Magazine, 2023, submitted

I can hear you loud and clear: GNSS-less high altitude aircraft navigation with terrestrial cellular signals of opportunity
Z. Kassas, A. Abdallah, S. Shahcheraghi, J. Khalife, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
IEEE Transactions on Aerospace and Electronic Systems, 2023, submitted

Ad astra: simultaneous tracking and navigation with megaconstellation LEO satellites
Z. Kassas, N. Khairallah, and S. Kozhaya
IEEE Aerospace and Electronic Systems Magazine, 2023, accepted

Ephemeris tracking and error propagation analysis of LEO satellites with application to opportunistic navigation
N. Khairallah and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2024, Vol. 60, no. 2, pp. 1242-1259

Unveiling Starlink LEO satellite OFDM-like signal structure enabling precise positioning
M. Neinavaie and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2024, Vol. 60, no. 2, pp. 2486-2489

GNSS software defined radio: History, current developments, and standardization efforts
T. Pany, D. Akos, J. Arribas, M. Bhuiyan, P. Closas, F. Dovis, I. Fernandez-Hernandez, C. Fernández–Prades, S. Gunawardena, T. Humphreys, Z. Kassas, J. López Salcedo, M. Nicola, M. Psiaki, A. Rügamer, Y. Song, and J. Won
NAVIGATION, Journal of the Institute of Navigation, 2024, Vol. 71, no. 1, pp. 1-45

Cognitive sensing and navigation with unknown OFDM signals with application to terrestrial 5G and Starlink LEO satellites
M. Neinavaie and Z. Kassas
IEEE Journal on Selected Areas in Communications, 2024, Vol. 42, no. 1, pp. 146-160

No GPS no problem: exploiting cellular OFDM-based signals for accurate navigation
Z. Kassas and A. Abdallah
IEEE Transactions on Aerospace and Electronic Systems, 2023, Vol. 59, no. 6, pp. 9792-9798

Performance analysis of opportunistic ARAIM for navigation with GNSS signals fused with terrestrial signals of opportunity
M. Jia, J. Khalife, and Z. Kassas
IEEE Transactions on Intelligent Transportation Systems, 2023, Vol. 24, no. 10, pp. 10587-10602

Efficient transmitter selection strategies for improved information gathering of aerial vehicle navigation in GNSS-denied environments
A. Nguyen and Z. Kassas
IEEE Aerospace and Electronic Systems Magazine, 2023, Vol. 38, no. 10, pp. 26-39

Cognitive detection of unknown beacons of terrestrial signals of opportunity for localization
M. Neinavaie, J. Khalife, and Z. Kassas
IEEE Transactions on Wireless Communications, 2023, Vol. 22, no. 8, pp. 5613-5627

Flight demonstration of high altitude aircraft navigation with cellular signals
Z. Kassas, J. Khalife, A. Abdallah, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
IEEE Intelligent Transportation Systems Magazine, 2023, Vol. 15, no. 4, pp. 150–165

Performance-driven design of carrier phase differential navigation frameworks with megaconstellation LEO satellites
J. Khalife and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2023, Vol. 59, no. 3, pp. 2947–2966

A static reduced-order multiple-model adaptive estimator for noise identification
J. Khalife and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2023, Vol. 59, no. 3, pp. 2672–2686

Opportunistic autonomous integrity monitoring for enhanced UAV safety
J. Khalife, M. Maaref, and Z. Kassas
IEEE Aerospace and Electronic Systems Magazine, 2023, Vol. 38, no. 5, pp. 34-44 (special issue)

Exploiting on-demand 5G downlink signals for opportunistic navigation
A. Abdallah, J. Khalife, and Z. Kassas
IEEE Signal Processing Letters, 2023, Vol. 30, pp. 389-393

Event-based communication strategies for collaborative inertial radio SLAM
J. Morales, J. Khalife, and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2023, Vol. 59, no. 2, pp. 1624-1642

Observability analysis of receiver localization via pseudorange measurements from a single LEO satellite
R. Sabbagh and Z. Kassas
IEEE Control Systems Letters, 2023, Vol. 7, pp. 571-576

Differential framework for submeter-accurate vehicular navigation with cellular signals
J. Khalife and Z. Kassas
IEEE Transactions on Intelligent Vehicles, 2023, Vol. 8, no. 1, pp. 732-744

PINDOC: pedestrian indoor navigation system integrating deterministic, opportunistic, and cooperative functionalities
C. Jao, A. Abdallah, C. Chen, M. Seo, S. Kia, Z. Kassas, and A. Shkel
IEEE Sensors Journal, 2022, Vol. 22, no. 14, pp. 14424-14435

Assessment of cellular signals of opportunity for high altitude aircraft navigation
Z. Kassas, J. Khalife, A. Abdallah, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
IEEE Aerospace and Electronic Systems Magazine, 2022, Vol. 37, no. 10, pp. 4-19

Urban road safety prediction: a satellite navigation perspective
H. Lee, J. Seo, and Z. Kassas
IEEE Intelligent Transportation Systems Magazine, 2022, Vol. 14, no. 6, pp. 94-106

On the achievability of submeter-accurate UAV navigation with cellular signals exploiting loose network synchronization
J. Khalife and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2022, Vol. 58, no. 5, pp. 4261-4278

I am not afraid of the GPS jammer: resilient navigation via signals of opportunity in GPS-denied environments
Z. Kassas, J. Khalife, A. Abdallah, and C. Lee
IEEE Aerospace and Electronic Systems Magazine, 2022, Vol. 37, no. 7, pp. 4-19

Acquisition, Doppler tracking, and positioning with Starlink LEO satellites: first results
M. Neinavaie, J. Khalife, and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2022, Vol. 58, no. 3, pp. 2606-2610

Information fusion strategies for collaborative inertial radio SLAM
J. Morales, J. Khalife, and Z. Kassas
IEEE Transactions on Intelligent Transportation Systems, 2022, Vol. 23, no. 8, pp. 12935-12952

Cognitive opportunistic navigation in private networks with 5G signals and beyond
M. Neinavaie, J. Khalife, and Z. Kassas
IEEE Journal of Selected Topics in Signal Processing, 2022, Vol. 16, no. 1, pp. 129-143

A pedestrian indoor navigation system using deep-learning-aided cellular signals and ZUPT-aided foot-mounted IMUs
A. Abdallah, C. Jao, Z. Kassas, and A. Shkel
IEEE Sensors Journal, 2022, Vol. 22, no. 6, pp. 5188-5198

The first carrier phase tracking and positioning results with Starlink LEO satellite signals
J. Khalife, M. Neinavaie, and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2022, Vol. 58, no. 2, pp. 1487-1491

UAV waypoint opportunistic navigation in GNSS-denied environments
Y. Yang, J. Khalife, J. Morales, and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2022, Vol. 58, no. 1, pp. 663-678

Autonomous integrity monitoring for vehicular navigation with cellular signals of opportunity and an IMU
M. Maaref and Z. Kassas
IEEE Transactions on Intelligent Transportation Systems, 2022, Vol. 23, no. 6, pp. 5586-5601

Multipath mitigation via synthetic aperture beamforming for indoor and deep urban navigation
A. Abdallah and Z. Kassas
IEEE Transactions on Vehicular Technology, 2021, Vol. 70, Issue 9, pp. 8838–8853

Aerial vehicle protection level reduction by fusing GNSS and terrestrial signals of opportunity
M. Maaref, J. Khalife, and Z. Kassas
IEEE Transactions on Intelligent Transportation Systems, 2021, Vol. 22, Issue 9, pp. 5976–5993 (special issue)

A joint TOA and DOA acquisition and tracking approach for positioning with LTE signals
K. Shamaei and Z. Kassas
IEEE Transactions on Signal Processing, 2021, Vol. 69, pp. 2689–2705

Receiver design and time of arrival estimation for opportunistic localization with 5G signals
K. Shamaei and Z. Kassas
IEEE Transactions on Wireless Communications, 2021, Vol. 20, Issue 7, pp. 4716–4731

Autonomous ground vehicle path planning in urban environments using GNSS and cellular signals reliability maps: simulation and experimental results
S. Ragothaman, M. Maaref, and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2021, Vol. 57, Issue 4, pp. 2575–2586

Autonomous ground vehicle path planning in urban environments using GNSS and cellular signals reliability maps: models and algorithms
S. Ragothaman, M. Maaref, and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2021, Vol. 57, Issue 3, pp. 1562–1580

Tightly-coupled inertial navigation system with signals of opportunity aiding
J. Morales and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2021, Vol. 56, Issue 3, pp. 1930–1948

Performance evaluation of TOA positioning in asynchronous cellular networks using stochastic geometry models
J. Khalife, C. Sevinc, and Z. Kassas
IEEE Wireless Communications Letters, 2020, Vol. 9, Issue 9, pp. 1422-1426

Measurement characterization and autonomous outlier detection and exclusion for ground vehicle navigation with cellular signals
M. Maaref and Z. Kassas
IEEE Transactions on Intelligent Vehicles, 2020, Vol. 5, Issue 4, pp. 670-683

Robust vehicular localization and map matching in urban environments through IMU, GNSS, and cellular signals
Z. Kassas, M. Maaref, J. Morales, J. Khalife, and K. Shamaei
IEEE Intelligent Transportation Magazine, 2020, Vol. 12, Issue 3, pp. 36-52, (special issue)

Opportunistic UAV navigation with carrier phase measurements from asynchronous cellular signals
J. Khalife and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2020, Vol. 56, Issue 4, pp. 3285-3301

Ground vehicle navigation in GNSS-challenged environments using signals of opportunity and a closed-loop map-matching approach
M. Maaref and Z. Kassas
IEEE Transactions on Intelligent Transportation Systems, 2020, Vol. 21, Issue 7, pp. 2723-2738

Autonomous surface vehicle multistep look-ahead measurement location planning for optimal localization of underwater acoustic transponders
J. Garcia, J. Farrell, Z. Kassas, and M. Ouimet
IEEE Transactions on Aerospace and Electronic Systems, 2019, Vol. 55, Issue 6, pp. 2836-2849

Optimal sensor placement for dilution of precision minimization via quadratically constrained fractional programming
J. Khalife and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2019, Vol. 55, Issue 4, pp. 2086-2096

Lane-level localization and mapping in GNSS-challenged environments by fusing lidar data and cellular pseudoranges
M. Maaref, J. Khalife, and Z. Kassas
IEEE Transactions on Intelligent Vehicles, 2019, Vol. 4, Issue 1, pp. 73-89

Stochastic observability and uncertainty characterization in simultaneous receiver and transmitter localization
J. Morales and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2019, Vol. 55, Issue 2, pp. 1021-1031

LTE receiver design and multipath analysis for navigation in urban environments
K. Shamaei and Z. Kassas
NAVIGATION, Journal of the Institute of Navigation, 2018, Vol. 65, Issue 4, pp. 655-675 (invited)

Navigation with cellular CDMA signals - Part II: performance analysis and experimental results
J. Khalife and Z. Kassas
IEEE Transactions on Signal Processing, 2018, Vol. 66, Issue 8, Apr. 2018, pp. 2204-2218

Navigation with cellular CDMA signals - Part I: signal modeling and software-defined receiver design
J. Khalife, K. Shamaei, and Z. Kassas
IEEE Transactions on Signal Processing, 2018, Vol. 66, Issue 8, Apr. 2018, pp. 2191-2203

Exploiting LTE signals for navigation: theory to implementation
K. Shamaei, J. Khalife, and Z. Kassas
IEEE Transactions on Wireless Communications, 2018, Vol. 17, Issue 4, Apr. 2018, pp. 2173-2189

Optimal collaborative mapping of terrestrial transmitters: receiver placement and performance characterization
J. Morales and Z. Kassas
IEEE Transactions on Aerospace and Electronic Systems, 2018, Vol. 54, Issue 2, Apr. 2018, pp. 992-1007

I hear, therefore I know where I am: compensating for GNSS limitations with cellular signals
Z. Kassas, J. Khalife, K. Shamaei, and J. Morales
IEEE Signal Processing Magazine, Vol. 34, Issue 5, Sep. 2017, pp. 111-124 (special issue)

Receding horizon trajectory optimization in opportunistic navigation environments
Z. Kassas and T. Humphreys
IEEE Transactions on Aerospace and Electronic Systems, Vol. 51, Issue 2, Apr. 2015, pp. 866-877

Greedy motion planning for simultaneous signal landscape mapping and receiver localization
Z. Kassas, A. Arapostathis, and T. Humphreys
IEEE Journal of Selected Topics in Signal Processing, Vol. 9, Issue 2, Mar. 2015, pp. 247-258

A phase-reconstruction technique enabling low-power centimeter-accurate mobile positioning
K. Pesyna, Z. Kassas, R. Heath, and T. Humphreys
IEEE Transactions on Signal Processing, Vol. 62, Issue 10, May 2014, pp. 2595-2610

Observability analysis of collaborative opportunistic navigation with pseudorange measurements
Z. Kassas and T. Humphreys
IEEE Transactions on Intelligent Transportation Systems, Vol. 15, Issue 1, Feb. 2014, pp. 260-273

Discretisation of continuous-time dynamic MIMO systems with nonuniform delays
Z. Kassas
IET Control Theory & Applications, Vol. 5, Issue 14, Sep. 2011, pp. 1637-1647

A nonlinear filter coupled with hospitability and synthetic inclination maps for in-surveillance and out-of-surveillance target tracking
Z. Kassas and U. Ozguner
IEEE Transactions on Systems, Man, and Cybernetics - Part C, Vol. 40, Issue 1, Jan. 2010, pp. 87-97

Power matching approach for GPS coverage extension
S. Saab and Z. Kassas
IEEE Transactions on Intelligent Transportation Systems, Vol. 7, Issue 2, Jun. 2006, pp. 156-166

Ephemeris error correction for tracking non-cooperative LEO satellites with pseudorange measurements
S. Hayek, J. Saroufim, and Z. Kassas
IEEE Aerospace Conference, Mar. 2-9, 2024, Big Sky, MT, accepted

Analysis of satellite ephemeris error in differential and non-differential navigation with LEO satellites
J. Saroufim, S. Hayek, and Z. Kassas
IEEE Aerospace Conference, Mar. 2-9, 2024, Big Sky, MT, accepted

Blind Doppler tracking and positioning with NOAA LEO satellite signals
S. Kozhaya, H. Kanj, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 11-15, 2023, Denver, CO, pp. 363-372

Ephemeris error modeling in opportunistic LEO satellite tracking with pseudorange and Doppler measurements
S. Hayek, J. Saroufim, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 11-15, 2023, Denver, CO, pp. 2123-2133

Evaluation of orbit errors and measurement corrections in differential navigation with LEO satellites
J. Saroufim, S. Hayek, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 11-15, 2023, Denver, CO, pp. 2823-2834

Acquisition and tracking of Starlink LEO satellite signals in low SNR regime
H. Kanj, S. Kozhaya, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 11-15, 2023, Denver, CO, pp. 3420-3431

Joint Doppler and azimuth DOA tracking for positioning with Iridium LEO satellites
S. Shahcheraghi, F. Gourabi, M. Neinavaie, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 11-15, 2023, Denver, CO, pp. 2373-2383

Positioning with Starlink LEO satellites: A blind Doppler spectral approach
S. Kozhaya and Z. Kassas
IEEE Vehicular Technology Conference, Jun. 20-23, 2023, Florence, Italy, pp. 1-5

Multi-constellation blind beacon estimation, Doppler tracking, and opportunistic positioning with OneWeb, Starlink, Iridium NEXT, and Orbcomm LEO satellites
S. Kozhaya, H. Kanj, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 25-27, 2023, Monterey, pp. 1184-1195

Signal mode transition detection in Starlink LEO satellite downlink signals
M. Neinavaie and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 25-27, 2023, Monterey, pp. 360-364

Navigation with multi-constellation LEO satellite signals of opportunity: Starlink, OneWeb, Orbcomm, and Iridium
Z. Kassas, S. Kozhaya, H. Kanj, J. Saroufim, S. Hayek, M. Neinavaie, N. Khairallah, and J. Khalife
IEEE/ION Position, Location, and Navigation Symposium, Apr. 25-27, 2023, Monterey, pp. 338-343

Robust receiver design for high altitude aircraft navigation with terrestrial cellular signals
Z. Kassas, S. Shahcheraghi, A. Kaiss, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
IEEE/ION Position, Location, and Navigation Symposium, Apr. 25-27, 2023, Monterey, pp. 75-80

Simultaneous LEO satellite tracking and differential LEO-aided IMU navigation
J. Saroufim, S. Hayek, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 25-27, 2023, Monterey, pp. 179-188

Fault detection and exclusion for INS/GPS/5G tightly-coupled navigation
M. Jia and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 25-27, 2023, Monterey, pp. 597-602

Assessment of differential Doppler navigation with Starlink LEO satellite signals of opportunity
S. Hayek, J. Saroufim, M. Neinavaie, S. Kozhaya, and Z. Kassas
ION International Technical Meeting, Jan. 23-26, 2023, Long Beach, CA, pp. 1021-1031

Detection of constrained unknown beacon signals of terrestrial transmitters and LEO satellites with application to navigation
M. Neinavaie, J. Khalife, and Z. Kassas
IEEE Vehicular Technology Conference, Sep. 26-29, 2022, London, England, pp. 1-5

Protecting the skies: GNSS-less aircraft navigation with terrestrial cellular signals of opportunity
Z. Kassas, A. Abdallah, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 1014-1025

Observability analysis of opportunistic receiver localization with LEO satellite pseudorange measurements
R. Sabbagh and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 1890-1901

Joint detection and tracking of unknown beacons for navigation with 5G signals and beyond
M. Neinavaie and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 921-932

Blind receiver for LEO beacon estimation with application to UAV carrier phase differential navigation
S. Kozhaya and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 2385-2397

Unveiling beamforming strategies of Starlink LEO satellites
M. Neinavaie and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 2525-2531

Sub-meter accurate pedestrian indoor navigation system with dual ZUPT-aided INS, machine learning-aided LTE, and UWB signals
C. Jao, A. Abdallah, C. Chen, M. Seo, S. Kia, Z. Kassas, and A. Shkel
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 1108-1126

GNSS software defined radio: History, current developments, and standardization efforts
D. Akos, J. Arribas, M. Bhuiyan, P. Closas, F. Dovis, I. Fernandez-Hernandez, C. Fernández–Prades, S. Gunawardena, T. Humphreys, Z. Kassas, J. López Salcedo, M. Nicola, T. Pany, M. Psiaki, A. Rügamer, Y. Song, and J. Won
ION Global Navigation Satellite Systems Conference, Sep. 19-23, 2022, Denver, CO, pp. 3180-3209

Kalman filter-based integrity monitoring for GNSS and 5G signals of opportunity integrated navigation
M. Jia and Z. Kassas
IFAC Symposium on Advances in Automotive Control, Aug. 29-31, 2022, Columbus, OH, pp. 273-278 (special session)

A hybrid analytical-machine learning approach for LEO satellite orbit prediction
J. Haidar-Ahmad,  N. Khairallah, and Z. Kassas
International Conference on Information Fusion, Jul. 4-7, 2022, Linköping, Sweden, pp. 1-7 (special session)

An interacting multiple model estimator of LEO satellite clocks for improved positioning
N. Khairallah and Z. Kassas
IEEE Vehicular Technology Conference, Jun. 19-22, 2022, Helsinki, Finland, pp. 1-5

Multipath mitigation of 5G signals via reinforcement learning for navigation in urban environments
A. Abdallah, M. Orabi, and Z. Kassas
IEEE Vehicular Technology Conference, Jun. 19-22, 2022, Helsinki, Finland, pp. 1-5

Demo: I am not afraid of the GPS jammer: exploiting cellular signals for accurate ground vehicle navigation in a GPS-denied environment
A. Abdallah, Z. Kassas, and C. Lee
ACM Workshop on Automotive and Autonomous Vehicle Security, Apr. 24, 2022, San Diego, CA, pp. 1-1

Opportunistic navigation using sub-6 GHz 5G downlink signals: a case study on a ground vehicle
A. Abdallah and Z. Kassas
European Conference on Antennas and Propagation, Mar. 27 - Apr. 1, 2022, Madrid, Spain, pp. 1-5 (special session)

First results of differential Doppler positioning with unknown Starlink satellite signals
M. Neinavaie, Z. Shadram, S. Kozhaya, and Z. Kassas
IEEE Aerospace Conference, Mar. 5-12, 2022, Big Sky, MT, pp. 1-14

Received power characterization of terrestrial cellular signals on high altitude aircraft
Z. Kassas, A. Abdallah, J. Khalife, C. Lee, J. Jurado, S. Wachtel, J. Duede, Z. Hoeffner, T. Hulsey, R. Quirarte, and R. Tay
IEEE Aerospace Conference, Mar. 5-12, 2022, Big Sky, MT, pp. 1-8

Transmitter selection for improved information gathering in aerial vehicle navigation with terrestrial signals of opportunity
A. Nguyen and Z. Kassas
ION International Technical Meeting, Jan. 25-27, 2022, Long Beach, CA, pp. 723-734

Doppler stretch estimation with application to tracking Globalstar satellite signals
M. Neinavaie, J. Khalife, and Z. Kassas
IEEE Military Communications Conference, Nov. 28 - Dec. 1, 2021, San Diego, CA, pp. 647-651 (special session)

Universal receiver architecture for blind navigation with partially known terrestrial and extraterrestrial signals of opportunity
J. Khalife, M. Neinavaie, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 2201–2211

Exploiting Starlink signals for navigation: first results
M. Neinavaie, J. Khalife, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 2766-2773

Comparison of neural network architectures for simultaneous tracking and navigation with LEO satellites
S. Kozhaya, J. Haidar-Ahmad, A. Abdallah, Z. Kassas, and S. Saab
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 2507–2520

UAV navigation with 5G carrier phase measurements
A. Abdallah and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 3294-3306

Ephemeris closed-loop tracking of LEO satellites with pseudorange and Doppler measurements
N. Khairallah and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 2544-2555

A machine learning multipath mitigation approach for opportunistic navigation with 5G signals
M. Orabi, A. Abdallah, J. Khalife, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 2895-2909

A lower bound for the error covariance of radio SLAM with terrestrial signals of opportunity
A. Nguyen, Z. Shadram, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 20-24, 2021, St. Louis, MO, pp. 2294-2306

Ground vehicle navigation integrity monitoring for multi-constellation GNSS fused with cellular signals of opportunity
M. Jia, H. Lee, J. Khalife, Z. Kassas, and J. Seo
IEEE International Conference on Intelligent Transportation Systems, Sep. 19-22, 2021, Indianapolis, IN, pp. 3978–3983

Blind Doppler tracking from OFDM signals transmitted by broadband LEO satellites
J. Khalife, M. Neinavaie, and Z. Kassas
IEEE Vehicular Technology Conference, Apr. 25-28, 2021, Helsinki, Finland, pp. 1-5

Experimental characterization of received 5G signals carrier-to-noise ratio in indoor and urban environments
A. Abdallah, J. Khalife, and Z. Kassas
IEEE Vehicular Technology Conference, Apr. 25-28, 2021, Helsinki, Finland, pp. 1-5

Blind Doppler tracking and beacon detection for opportunistic navigation with LEO satellite signals
M. Neinavaie, J. Khalife, and Z. Kassas
IEEE Aerospace Conference, Mar. 6-13, 2021, Big Sky, MT, pp. 1-8

Opportunistic navigation with Doppler measurements from Iridium Next and Orbcomm LEO satellites
M. Orabi, J. Khalife, and Z. Kassas
IEEE Aerospace Conference, Mar. 6-13, 2021, Big Sky, MT, pp. 1-9

Assessing machine learning for LEO satellite orbit determination in simultaneous tracking and navigation
T. Mortlock and Z. Kassas
IEEE Aerospace Conference, Mar. 6-13, 2021, Big Sky, MT, pp. 1-8

Evaluation of ground vehicle protection level reduction due to fusing GPS with faulty terrestrial signals of opportunity
M. Jia, J. Khalife, and Z. Kassas
ION International Technical Meeting, Jan. 25-28, 2021, San Diego, CA, pp. 354–365

Neural network-based ranging with LTE channel impulse response for localization in indoor environments
H. Lee, A. Abdallah, J. Park, J. Seo, and Z. Kassas
International Conference on Control, Automation, and Systems, Oct. 13-16, 2020, Busan, South Korea, pp. 939–944

I am not afraid of the jammer: navigating with signals of opportunity in GPS-denied environments
Z. Kassas, J. Khalife, A. Abdallah, and C. Lee
ION Global Navigation Satellite Systems Conference, Sep. 21-25, 2020, St. Louis, MO, pp. 1566–1585

Blind opportunistic navigation: cognitive deciphering of partially known signals of opportunity
M. Neinavaie, J. Khalife, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 21-25, 2020, St. Louis, MO, pp. 2748–2757

Assessing real 5G signals for opportunistic navigation
A. Abdallah, K. Shamaei, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 21-25, 2020, St. Louis, MO, pp. 2548–2559

Blind Doppler estimation from LEO satellite signals: a case study with real 5G signals
J. Khalife, M. Neinavaie, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 21-25, 2020, St. Louis, MO, pp. 3046–3054

Performance analysis of simultaneous tracking and navigation with LEO satellites
T. Mortlock and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 21-25, 2020, St. Louis, MO, pp. 2416–2429

Integrity-based path planning strategy for urban autonomous vehicular navigation using GPS and cellular signals
H. Lee, J. Seo, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 21-25, 2020, St. Louis, MO, pp. 2347–2357

Enhanced safety of autonomous driving by incorporating terrestrial signals of opportunity
M. Maaref, J. Khalife, and Z. Kassas
IEEE International Conference on Acoustics, Speech, and Signal Processing, May 4-8, 2020, Barcelona, Spain, pp. 9185–9189 (special session)

Navigation with differential carrier phase measurements from megaconstellation LEO satellites
J. Khalife, M. Neinavaie, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 22-24, 2020, Portland, OR, pp. 1393–1404

Deep learning-aided spatial discrimination for multipath mitigation
A. Abdallah and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 22-24, 2020, Portland, OR, pp. 1324–1335

Optimal GPS integrity-constrained path planning for ground vehicles
M. Maaref and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 22-24, 2020, Portland, OR, pp. 655-660

A machine learning approach for GPS code phase estimation in multipath environments
M. Orabi, J. Khalife, A. Abdallah, Z. Kassas, and S. Saab
IEEE/ION Position, Location, and Navigation Symposium, Apr. 22-24, 2020, Portland, OR, pp. 1224–1229

Performance characterization of an indoor localization system with LTE code and carrier phase measurements and an IMU
A. Abdallah, K. Shamaei, and Z. Kassas
International Conference on Indoor Positioning and Indoor Navigation, Sep. 30 - Oct. 3, 2019, Pisa, Italy, pp. 1-8

Multipath-optimal UAV trajectory planning for urban UAV navigation with cellular signals
S. Ragothaman, M. Maaref, and Z. Kassas
IEEE Vehicular Technology Conference, Sep. 22-25, 2019, Honolulu, HI, pp. 1-6

Evaluation of feedback and feedforward coupling of synthetic aperture navigation with LTE signals
A. Abdallah and Z. Kassas
IEEE Vehicular Technology Conference, Sep. 22-25, 2019, Honolulu, HI, pp. 1-6

Orbit modeling for simultaneous tracking and navigation using LEO satellite signals
J. Morales, J. Khalife, U. Santa Cruz, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 16-20, 2019, Miami, FL, pp. 2090-2099

Assessment of differential carrier phase measurements from Orbcomm LEO satellite signals for opportunistic navigation
J. Khalife and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 16-20, 2019, Miami, FL, pp. 4053-4063

Sub-meter accurate UAV navigation and cycle slip detection with LTE carrier phase measurements
K. Shamaei and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 16-20, 2019, Miami, FL, pp. 2469-2479

UAV integrity monitoring measure improvement using terrestrial signals of opportunity
M. Maaref and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 16-20, 2019, Miami, FL, pp. 3045-3056

Indoor localization with LTE carrier phase measurements and synthetic aperture antenna array
A. Abdallah, K. Shamaei, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 16-20, 2019, Miami, FL, pp. 2670-2679

Receiver design for Doppler positioning with LEO satellites
J. Khalife and Z. Kassas
IEEE International Conference on Acoustics, Speech, and Signal Processing, May 12-17, 2019, Brighton, UK, pp. 5506-5510

Simultaneous tracking of Orbcomm LEO satellites and inertial navigation system aiding using Doppler measurements
J. Morales, J. Khalife, and Z. Kassas
IEEE Vehicular Technology Conference, Apr. 28 - May 1, 2019, Kuala Lumpur, Malaysia, pp. 1-6

A framework for navigation with LTE time-correlated pseudorange errors in multipath environments
K. Shamaei, J. Morales, and Z. Kassas
IEEE Vehicular Technology Conference, Apr. 28 - May 1, 2019, Kuala Lumpur, Malaysia, pp. 1-6

Pseudorange measurement outlier detection for navigation with cellular signals
M. Maaref, J. Khalife, and Z. Kassas
ACM/IEEE International Conference on Cyber-Physical Systems, Apr. 16-18, 2019, Montreal, Canada, pp. 346-347

Performance evaluation of navigation using LEO satellite signals with periodically transmitted satellite positions
C. Ardito, J. Morales, J. Khalife, A. Abdallah, and Z. Kassas
ION International Technical Meeting, Jan. 28-31, 2019, Reston, VA, pp. 306-318

Event-based communication strategy for collaborative navigation with signals of opportunity
J. Morales and Z. Kassas
Asilomar Conference on Signals, Systems and Computers, Oct. 28-31, 2018, Pacific Grove, CA, pp. 548-553 (invited)

Inertial navigation system aiding with Orbcomm LEO satellite Doppler measurements
J. Morales, J. Khalife, A. Abdallah, C. Ardito, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 24-28, 2018, Miami, FL, pp. 2718-2725

Centimeter-accurate UAV navigation with cellular signals
J. Khalife, S. Bhattacharya, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 24-28, 2018, Miami, FL, pp. 2321-2331

Integrity monitoring of LTE signals of opportunity-based navigation for autonomous ground vehicles
M. Maaref, J. Khalife, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 24-28, 2018, Miami, FL, pp. 2456-2466

Positioning performance of LTE signals in Rician fading environments exploiting antenna motion
K. Shamaei, J. Morales, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 24-28, 2018, Miami, FL, pp. 3423-3432

Indoor positioning based on LTE carrier phase measurements and an inertial measurement unit
A. Abdallah, K. Shamaei, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 24-28, 2018, Miami, FL, pp. 3374-3384

A low communication rate distributed inertial navigation architecture with cellular signal aiding
J. Morales and Z. Kassas
IEEE Vehicular Technology Conference, Jun. 3-6, 2018, Porto, Portugal, pp. 1-6

Precise UAV navigation with cellular carrier phase measurements
J. Khalife and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 23-26, 2018, Monterey, CA, pp. 978-989

Information fusion strategies for collaborative radio SLAM
J. Morales and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 23-26, 2018, Monterey, CA, pp. 1445-1454

A joint TOA and DOA approach for positioning with LTE signals
K. Shamaei, J. Khalife, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 23-26, 2018, Monterey, CA, pp. 81-91

Optimal measurement location planning for localizing underwater transponders
J. Garcia, J. Farrell, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 23-26, 2018, Monterey, CA, pp. 480-486

A machine learning approach for localization in cellular environments
A. Abdallah, S. Saab, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 23-26, 2018, Monterey, CA, pp. 1223-1227

Pseudorange and multipath analysis of positioning with LTE secondary synchronization signals
K. Shamaei, J. Khalife, and Z. Kassas
IEEE Wireless Communications and Networking Conference, Apr. 15-18, 2018, Barcelona, Spain, pp. 286-291 (special session)

Distributed signals of opportunity aided inertial navigation with intermittent communication
J. Morales and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 25-29, 2017, Portland, OR, pp. 2519-2530

Computationally efficient receiver design for mitigating multipath for positioning with LTE signals
K. Shamaei, J. Khalife, S. Bhattacharya, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 25-29, 2017, Portland, OR, pp. 3751-3760

Evaluation of relative clock stability in cellular networks
J. Khalife and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 25-29, 2017, Portland, OR, pp. 2554-2559

Ranging precision analysis of LTE signals
K. Shamaei, J. Khalife, and Z. Kassas
European Signal Processing Conference, Aug. 28 - Sep. 2, 2017, Kos Island, Greece, pp. 2788-2792 (special session)

Pose estimation with lidar odometry and cellular pseudoranges
J. Khalife, S. Ragothaman, and Z. Kassas
IEEE Intelligent Vehicles Symposium, Jun. 11-14, 2017, Redondo Beach, CA, pp. 1722-1727

Modeling and analysis of sector clock bias mismatch for navigation with cellular signals
J. Khalife and Z. Kassas
American Control Conference, May 24-26, 2017, Seattle, WA, pp. 3573-3578

Collaborative autonomous vehicles with signals of opportunity aided inertial navigation systems
J. Morales, J. Khalife, and Z. Kassas
ION International Technical Meeting, Jan. 30 - Feb. 2, 2017, Monterey, CA, pp. 805-818

Comparative results for positioning with secondary synchronization signal versus cell specific reference signal in LTE systems
K. Shamaei, J. Khalife, and Z. Kassas
ION International Technical Meeting, Jan. 30 - Feb. 2, 2017, Monterey, CA, pp. 1256-1268

Signals of opportunity aided inertial navigation
J. Morales, P. Roysdon, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 12-16, 2016, Portland, OR, pp. 1492-1501

Performance characterization of positioning in LTE systems
K. Shamaei, J. Khalife, and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 12-16, 2016, Portland, OR, pp. 2262-2270

Characterization of sector clock biases in cellular CDMA systems
J. Khalife and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 12-16, 2016, Portland, OR, pp. 2281-2285

A software-defined receiver architecture for cellular CDMA-based navigation
J. Khalife, K. Shamaei, and Z. Kassas
IEEE/ION Position, Location, and Navigation Symposium, Apr. 11-14, 2016, Savannah, GA, pp. 816-826

GNSS vertical dilution of precision reduction using terrestrial signals of opportunity
J. Morales, J. Khalife, and Z. Kassas
ION International Technical Meeting, Jan. 25-28, 2016, Monterey, CA, pp. 664-669

Optimal receiver placement for collaborative mapping of signals of opportunity
J. Morales and Z. Kassas
ION Global Navigation Satellite Systems Conference, Sep. 14-18, 2015, Tampa, FL, pp. 2362-2368

Indoor localization based on floor plans and power maps: non-line of sight to virtual line of sight
J. Khalifeh, Z. Kassas, and S. Saab
ION Global Navigation Satellite Systems Conference, Sep. 14-18, 2015, Tampa, FL, pp. 2291-2300

Adaptive estimation of signals of opportunity
Z. Kassas, V. Ghadiok, and T. Humphreys
ION Global Navigation Satellite Systems Conference, Sep. 8-12, 2014, Tampa, FL, pp. 1679-1689

A graphical approach to GPS software-defined receiver implementation
Z. Kassas, J. Bhatti, and T. Humphreys
IEEE Global Conference on Signal and Information Processing, Dec. 3-5, 2013, Austin, TX, pp. 1226-1229 (invited)

The price of anarchy in active signal landscape map building
Z. Kassas and T. Humphreys
IEEE Global Conference on Signal and Information Processing, Dec. 3-5, 2013, Austin, TX, pp. 165-168

Receding horizon trajectory optimization for simultaneous signal landscape mapping and receiver localization
Z. Kassas, J. Bhatti, and T. Humphreys
ION Global Navigation Satellite Systems Conference, Sep. 16-20, 2013, Nashville, TN, pp. 1962-1969

Motion planning for optimal information gathering in opportunistic navigation systems
Z. Kassas and T. Humphreys
AIAA Guidance, Navigation, and Control Conference, Aug. 19-22, 2013, Boston, MA, pp. 4551-4565

Observability and estimability of collaborative opportunistic navigation with pseudorange measurements
Z. Kassas and T. Humphreys
ION Global Navigation Satellite Systems Conference, Sep. 17-21, 2012, Nashville, TN, pp. 621-630

Observability analysis of opportunistic navigation with pseudorange measurements
Z. Kassas and T. Humphreys
AIAA Guidance, Navigation, and Control Conference, Aug. 13-16, 2012, Minneapolis, MN, pp. 4760-4775

Optimal H2 and H∞ control of extremely large segmented telescopes
Z. Kassas and R. Bishop
AIAA Guidance, Navigation, and Control Conference, Aug. 13-16, 2012, Minneapolis, MN, pp. pp. 4529-4540

Constructing a continuous phase time history from TDMA signals for opportunistic navigation
K. Pesyna, Z. Kassas, and T. Humphreys
IEEE/ION Position, Location, and Navigation Symposium, Apr. 24-26, 2012, Myrtle Beach, SC, pp. 1209-1220

Tightly-coupled opportunistic navigation for deep urban and indoor positioning
K. Pesyna, Z. Kassas, J. Bhatti, and T. Humphreys
ION Global Navigation Satellite Systems Conference, Sep. 20-23, 2011, Portland, OR, pp. 3605-3617

Numerical simulation of continuous-time stochastic dynamical systems with noisy measurements and their discrete-time equivalents
Z. Kassas
IEEE International Symposium on Computer-Aided Control System Design, Sep. 28-30, 2011, Denver, CO, pp. 1397-1402

Methodologies for implementing FPGA-based control systems
Z. Kassas
IFAC World Congress, Aug. 28 - Sep. 2, 2011, Milan, Italy, pp. 9911-9916

A numerical algorithm for reconstructing continuous-time linear models with pure integrators from their discrete-time equivalents
Z. Kassas and G. Morrow
IEEE International Symposium on Computer-Aided Control System Design, Sep. 3-5, 2008, San Antonio, TX, pp. 377-382

New mechatronics development techniques for FPGA-based control of electromechanical systems
B. MacCleery and Z. Kassas
IFAC World Congress, Jul. 6-11, 2008, Seoul, South Korea, pp. 4434-4439

A unified approach for classroom and laboratory control systems education
Z. Kassas and R. Dunia
IFAC World Congress, Jul. 6-11, 2008, Seoul, South Korea, pp. 14618-14623

Discretization of MIMO systems with nonuniform input and output fractional time delays
Z. Kassas and R. Dunia
IEEE Conference on Decision and Control, Dec. 13-15, 2006, San Diego, CA, pp. 2541-2546

Out-of-surveillance target state estimation: a combined hospitability and synthetic inclination approach
Z. Kassas, U. Ozguner, and J. Layne
IEEE Conference on Decision and Control, Dec. 14-17, 2004, Paradise Island, Bahamas, pp. 710-715

Map-based land vehicle navigation system with DGPS
S. Saab and Z. Kassas
IEEE Intelligent Vehicle Symposium, Jun. 17-21, 2002, Versailles, France, pp. 209-214

A look at the stars: navigation with multi-constellation LEO satellite signals of opportunity
Z. Kassas, S. Kozhaya, J. Saroufim, H. Kanj, and S. Hayek
Inside GNSS Magazine, Vol. 18, Issue 4, Aug. 2023, pp. 38–47 (cover article)

Securing PNT for highly automated transportation systems
Z. Kassas
Institute of Navigation Newsletter, Vol. 33, Issue 2, Apr. 2023, pp. 14-15 (invited)

Enter LEO on the GNSS stage: navigation with Starlink satellites
Z. Kassas, M. Neinavaie, J. Khalife, N. Khairallah, S. Kozhaya, J. Haidar-Ahmad, and Z. Shadram
Inside GNSS Magazine, Vol. 16, Issue 6, Dec. 2021, pp. 42-51 (cover article)

Carpe signum: seize the signal – opportunistic navigation with 5G
Z. Kassas, A. Abdallah, and M. Orabi
Inside GNSS Magazine, Vol. 16, Issue 1, Feb. 2021, pp. 52–57

Recent advancement on the use of global navigation satellite system-based positioning for intelligent transport systems
F. Dovis, L. Ruotsalainen, R. Toledo-Moreo, Z. Kassas, and V. Gikas
IEEE Intelligent Transportation Systems Magazine, Vol. 12, Issue 3, Jul. 2020, pp. 6–9 (special issue)

Opportunity comes knocking: overcoming GPS vulnerabilities with other satellites’ signals
Z. Kassas, J. Khalife, M. Neinavaie, and T. Mortlock
Inside Unmanned Systems Magazine, Jul. 2020, pp. 30–35 (special issue)

New-age satellite-based navigation – STAN: simultaneous tracking and navigation with LEO satellite signals
Z. Kassas, J. Morales, and J. Khalife
Inside GNSS Magazine, Vol. 14, Issue 4, Aug. 2019, pp. 56–65 (cover article)

Navigation systems for autonomous and semi-autonomous vehicles: current trends and future challenges
Z. Kassas, P. Closas, and J. Gross
IEEE Aerospace and Electronic Systems Magazine, Vol. 34, Issue 5, May 2019, pp. 82-84 (invited)

LTE steers UAV
Z. Kassas, J. Morales, K. Shamaei, and J. Khalife
GPS World Magazine, Vol. 28, Issue 4, Apr. 2017, pp. 18-25 (cover article)

Opportunity for accuracy
J. Morales, J. Khalife, and Z. Kassas
GPS World Magazine, Vol. 27, Issue 3, Mar. 2016, pp. 22-29 (cover article)

Collaborative opportunistic navigation
Z. Kassas
IEEE Aerospace and Electronic Systems Magazine, Vol. 28, Issue 6, Jun. 2013, pp. 38-41

Navigation from low Earth orbit – Part 2: models, implementation, and performance
Z. Kassas
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume 2, Wiley-IEEE Press, Jan. 2021, pp. 1381-1412

Navigation with cellular signals of opportunity
Z. Kassas
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume 2, Wiley-IEEE Press, Jan. 2021, pp. 1171-1223

A hospitability map approach for estimating a mobile target location
J. Layne, M. Eilders, Z. Kassas, and U. Ozguner
Recent Developments in Cooperative Control and Optimization, Kluwer Academic Publishers, Nov. 2003, pp. 117-124

Towards opportunistic navigation with LEO satellites: Adaptive clock estimation and closed-loop ephemeris tracking
N. Khairallah
M.S. Thesis, University of California, Irvine, USA, 2022

Aerial vehicle navigation with terrestrial signals of opportunity: Performance analysis and transmitter selection
A. Nguyen
M.S. Thesis, University of California, Irvine, USA, 2022

Indoor navigation with cellular signals utilizing synthetic aperture for multipath mitigation
A. Abdallah
M.S. Thesis, University of California, Irvine, USA, 2022

Path planning for autonomous ground vehicles using GNSS and cellular LTE signal reliability maps and GIS 3-D maps
S. Ragothaman
M.S. Thesis, University of California, Riverside, USA, 2018

Autonomous surface vehicle measurement location planning for optimal underwater acoustic transponder localization
J. Garcia
M.S. Thesis, University of California, Riverside, USA, 2018

Cognitive sensing and navigation with unknown terrestrial and LEO satellite signals
M. Neinavaie
Ph.D. Dissertation, The Ohio State University, Columbus, OH, USA, 2023

Exploiting cellular signals for navigation: 4G to 5G
K. Shamaei
Ph.D. Dissertation, University of California, Irvine, CA, USA, 2020

Precise navigation with cellular signals: Receiver design, differential and non-differential frameworks, and performance analysis
J. Khalife
Ph.D. Dissertation, University of California, Irvine, CA, USA, 2020

Inertial radio SLAM: Standalone and collaborative architectures
J. Morales
Ph.D. Dissertation, University of California, Irvine, CA, USA, 2020

Ultimate navigation chip: Synthetic aperture navigation with cellular signals and IMU
A. Abdallah, K. Shamaei, A. Shkel, and Z. Kassas
NIST Public Safety Broadband Stakeholder Meeting, Jul. 10, 2019, Chicago, IL

Pseudorange measurement outlier detection for navigation with cellular signals
M. Maaref, J. Khalife, and Z. Kassas
ACM/IEEE International Conference on Cyber-Physical Systems, Apr. 16-18, 2019, Montreal, Canada

Navigation with cellular CDMA signals
J. Khalife, K. Shamaei, and Z. Kassas
Southern California Robotics Symposium, Apr. 22, 2016, San Diego, CA

Mapping and exploitation of signals of opportunity
J. Morales, J. Khalife, and Z. Kassas
Southern California Robotics Symposium, Apr. 22, 2016, San Diego, CA

Vehicular navigation with cellular CDMA signals
J. Khalife, K. Shamaei, and Z. Kassas
University of California Center on Economic Competitiveness in Transportation Conference, Feb. 11-12, 2016, Riverside, CA

Blind beacon estimation, Doppler tracking, and opportunistic positioning with multi-constellation unknown LEO satellites
Z. Kassas, S. Kozhaya, and H. Kanj
U.S. Patent Application No. 63/498,189, Filed: Apr. 25, 2023

Cognitive opportunistic navigation with Starlink LEO satellites: on-demand and always-on OFDM reference signals
Z. Kassas and M. Neinavaie
U.S. Patent Application No. 63/457,372, Filed: Apr. 5, 2023

Systems and methods for positioning and navigation with low Earth orbit satellite signals
Z. Kassas and M. Neinavaie
U.S. Patent Application No. 63/393,501, Filed: Jul. 29, 2022

Systems and methods for determining cellular downlink observables and navigation
Z. Kassas and A. Abdallah
U.S. Patent Application No. 63/355,890, Filed: Jun. 27, 2022

Systems and methods for user equipment based 5G navigation and downlink bandwidth operations
Z. Kassas and A. Abdallah
U.S. Patent Application No. 63/315,719, Filed: Mar. 2, 2022

Systems and methods for acquisition and tracking of unknown LEO satellite signals
Z. Kassas, J. Khalife, and M. Neinavaie
U.S. Patent Application No. 63/210,595, Filed: Jun. 15, 2021

Systems and methods for differential and non-differential navigation with cellular signals
Z. Kassas and J. Khalife
U.S. Patent Application No. 63/155,048, Filed: Mar. 1, 2021

Systems and methods for blind opportunistic navigation, cognitive deciphering of partially known signals of opportunity, and blind Doppler estimation from LEO satellite signals
Z. Kassas, M. Neinavaie, and J. Khalife
U.S. Patent Application No. 63/087,591, Filed: Oct. 5, 2020

Navigation with differential carrier phase measurement from low Earth orbit satellites
Z. Kassas, J. Khalife, and M. Neinavaie
U.S. Patent Application No. 63/047,796, Filed: Jul. 2, 2020

Systems and methods for opportunistic time of arrival estimation for opportunistic localization with 5G signals
Z. Kassas and K. Shamaei
U.S. Patent Application No. 63/026,360, Filed: May 18, 2020

Systems and methods for TOA and DOA acquisition and tracking for signal of opportunity positioning
Z. Kassas and K. Shamaei
U.S. Patent Application No. 63/013,638, Filed: Apr. 22, 2020

Sub-meter accurate navigation and cycle slip detection with LTE carrier phase measurements
Z. Kassas and K. Shamaei
U.S. Patent Application No. 62/930,298, Filed: Nov. 4, 2019

Indoor localization system with LTE code and carrier phase measurements and an IMU
Z. Kassas, A. Abdallah, and K. Shamaei
U.S. Patent Application No. 62/913,078, Filed: Oct. 9, 2019

Synthetic aperture navigation with LTE signals
Z. Kassas and A. Abdallah
U.S. Patent Application No. 62/913,074, Filed: Oct. 9, 2019

Receiver design for Doppler positioning with low Earth orbit satellites and differential carrier phase measurements
Z. Kassas, J. Khalife, and A. Abdallah
U.S. Patent Application No. 62/834,317, Filed: Apr. 15, 2019

Simultaneous tracking and navigation using LEO satellite signals
Z. Kassas J. Morales, and J. Khalife
U.S. Patent Application No. 62/834,313, Filed: Apr. 15, 2019

Lane-level navigation system for ground vehicles with lidar and cellular signals
Z. Kassas, M. Maaref, and J. Khalife
U.S. Patent Application No. 62/721,967, Filed: Aug. 23, 2018

Signals of opportunity aided inertial navigation system
Z. Kassas and J. Morales
U.S. Patent Application No. 62/398,413, Filed: Sep. 22, 2016

Software-defined radio for navigation with LTE signals
Z. Kassas, K. Shamaei, and J. Khalife
U.S. Patent Application No. 62/398,403, Filed: Sep. 22, 2016

Software-defined radio for navigation with cellular CDMA signals
Z. Kassas, J. Khalife, and K. Shamaei
U.S. Patent Application No. 62/294,758, Filed: Feb. 12 2016

Multi-channel algorithm infrastructure for programmable hardware elements
Z. Kassas and J. Lewis
Patent No. 8,122,238, Issued: Feb. 21, 2012