Journal Papers

  1. Stochastic observability and uncertainty characterization in simultaneous receiver and transmitter localization
    J. Morales and Z. Kassas
    IEEE Transactions on Aerospace and Electronic Systems, 2018, accepted

  2. 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

  3. 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

  4. 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

  5. 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

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

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

  8. 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, March 2015, pp. 247-258

  9. 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

  10. 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

Conference Papers

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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)

  8. 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

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

  10. 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

  11. 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)

  12. 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

  13. 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

  14. 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

  15. 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 MeetingJan. 30 - Feb. 2, 2017, Monterey, CA, pp. 1256-1268

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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)

  25. 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

  26. 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

  27. 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

  28. 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

  29. 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

  30. 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

  31. 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

Magazine Articles

  1. 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)

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

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

Presentations

  1. Fusing lidar and cellular signals for robust ground and aerial autonomous navigation
    J. Khalife, S. Ragothaman, K. Shamaei, J. Morales, and Z. Kassas
    Southern California Robotics Symposium, Apr. 2017, Los Angeles, CA

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

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

  4. Robust autonomous vehicle navigation using signals of opportunity
    J. Khalife, K. Shamaei, and Z. Kassas
    University of California Center on Economic Competitiveness in Transportation (UCCONNECT), Feb. 2016, Riverside, CA

Patents

  1. Precise navigation with cellular carrier phase measurements
    Z. Kassas and J. Khalife
    U.S. Patent Application No. 62/663,209, Filed: Apr. 26, 2018

  2. Event-triggered communication scheme for crowdsourced signals of opportunity aided inertial navigation system
    Z. Kassas and J. Morales
    U.S. Patent Application No. 62/663,203, Filed: Apr. 26, 2018

  3. A self-contained approach for positioning with LTE signals using a joint TOA and DOA estimation
    Z. Kassas, K. Shamaei, and J. Khalife
    U.S. Patent Application No. 62/561,026, Filed: Apr. 26, 2018

  4. Crowdsourced signals of opportunity aided inertial navigation system
    Z. Kassas and J. Morales
    U.S. Patent Application No. 62/561,026, Filed: Sep. 20, 2017

  5. A real-time, multipath-mitigating receiver design for navigation with LTE signals
    Z. Kassas, K. Shamaei, and J. Khalife
    U.S. Patent Application No. 62/561,023, Filed: Sep. 20, 2017

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

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

  8. SDR 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

Ph.D. Dissertations

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