Journal Papers

  1. Optimal collaborative mapping of terrestrial transmitters: receiver placement and performance characterization
    J. Morales and Z. Kassas
    IEEE Transactions on Aerospace and Electronic Systems, 2017, accepted

  2. 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

  3. 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

  4. 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

  5. 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. 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

  2. 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

  3. 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

  4. 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)

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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)

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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. 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)

  2. 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)

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

  4. 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. 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

  2. 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

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

  4. 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

  5. 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