Journal Papers

  1. Opportunistic ARAIM for navigation with GNSS signals fused with terrestrial signals of opportunity: requirements and performance
    M. Jia, J. Khalife, and Z. Kassas
    IEEE Transactions on Intelligent Transportation Systems, 2022, submitted

  2. Observability analysis of receiver localization via pseudorange measurements from a single LEO satellite
    R. Sabbagh and Z. Kassas
    IEEE Control Systems Letters, 2022, submitted

  3. Ad astra: simultaneous tracking and navigation with megaconstellation LEO satellites
    Z. Kassas, N. Khairallah, S. Kozhaya, J. Khalife, M. Neinavaie, and J. Haidar-Ahmad
    IEEE Aerospace and Electronic Systems Magazine, 2022, submitted

  4. 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, submitted

  5. A static reduced-order multiple-model adaptive estimator for noise identification
    J. Khalife and Z. Kassas
    IEEE Transactions on Aerospace and Electronic Systems, 2021, submitted

  6. Cognitive detection of unknown beacons of terrestrial signals of opportunity for localization
    M. Neinavaie, J. Khalife, and Z. Kassas
    IEEE Transactions on Wireless Communications, 2021, submitted

  7. Differential framework for submeter-accurate vehicular navigation with cellular signals
    J. Khalife and Z. Kassas
    IEEE Transactions on Intelligent Vehicles, 2021, submitted

  8. Opportunistic autonomous integrity monitoring for enhanced UAV safety
    J. Khalife, M. Maaref, and Z. Kassas
    IEEE Aerospace and Electronic Systems Magazine, 2021, submitted

  9. 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, 2021, submitted

  10. 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, 2021, submitted

  11. Event-based communication strategies for collaborative inertial radio SLAM
    J. Morales, J. Khalife, and Z. Kassas
    IEEE Transactions on Aerospace and Electronic Systems, 2021, submitted

  12. 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, 2021, submitted

  13. Urban road safety state prediction: a satellite navigation perspective
    H. Lee, J. Seo, and Z. Kassas
    IEEE Intelligent Transportation Systems Magazine, 2021, submitted

  14. 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, accepted

  15. 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, accepted

  16. 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, 2021, accepted

  17. Information fusion strategies for collaborative inertial radio SLAM
    J. Morales, J. Khalife, and Z. Kassas
    IEEE Transactions on Intelligent Transportation Systems, 2021, accepted

  18. 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, 2021, accepted

  19. A pedestrian indoor navigation system using deep-learning-aided cellular signals and ZUPT-aided foot-mounted IMUs
    Abdallah, C. Jao, Z. Kassas, and A. Shkel
    IEEE Sensors Journal, 2021, accepted

  20. 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, 2021, accepted

  21. UAV waypoint opportunistic navigation in GNSS-denied environments
    Y. Yang, J. Khalife, J. Morales, and Z. Kassas
    IEEE Transactions on Aerospace and Electronic Systems, 2021, accepted

  22. 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

  23. 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)

  24. 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

  25. 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

  26. 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, 2021, accepted

  27. 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

  28. 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

  29. 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

  30. 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

  31. 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

  32. 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)

  33. 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

  34. 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

  35. 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

  36. 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

  37. 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

  38. 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

  39. 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)

  40. 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

  41. 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

  42. 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

  43. 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

  44. 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)

  45. 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

  46. 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

  47. 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

  48. 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

  49. 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

  50. 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

  51. 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

Conference Papers

  1. 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, accepted

  2. 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, accepted

  3. 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, accepted

  4. 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, accepted

  5. Received power characterization of terrestrial cellular signals on high altitude aircraft
    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 Conference, Mar. 5-12, 2022, Big Sky, MT, accepted

  6. 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, accepted

  7. 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)

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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, accepted

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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

  27. 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

  28. 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

  29. 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)

  30. 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

  31. 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

  32. 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

  33. 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

  34. 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

  35. 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

  36. 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

  37. 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

  38. 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

  39. 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

  40. 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

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

  42. 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

  43. 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

  44. 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

  45. 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

  46. 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

  47. 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)

  48. 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

  49. 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

  50. 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

  51. 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

  52. 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

  53. 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

  54. 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

  55. 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

  56. 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

  57. 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

  58. 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

  59. 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)

  60. 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

  61. 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

  62. 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

  63. 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)

  64. 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

  65. 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

  66. 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

  67. 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

  68. 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

  69. 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

  70. 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

  71. 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

  72. 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

  73. 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

  74. 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

  75. 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

  76. 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)

  77. 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

  78. 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

  79. 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

  80. 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

  81. 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

  82. 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

  83. 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

  84. 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

  85. 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

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

  87. 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

  88. 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

  89. 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

  90. 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

  91. 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

  92. 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

M.S. Theses

  1. 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, Dec. 2018

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

Ph.D. Dissertations

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

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

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

  4. Analysis and synthesis of collaborative opportunistic navigation systems
    Z. Kassas
    Ph.D. Dissertation, The University of Texas at Austin, USA, May 2014

Book Chapters

  1. 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

  2. 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

  3. 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

Magazine Articles

  1. 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)

  2. 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

  3. 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)

  4. 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)

  5. 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)

  6. 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)

  7. 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)

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

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

Patents

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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

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

  13. 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

  14. 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

  15. 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

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

  17. 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

  18. 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

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