Journal Papers

  1. LTE receiver design and multipath analysis for navigation in urban environments
    K. Shamaei and Z. Kassas
    NAVIGATION, Journal of the Institute of Navigation, 2018, accepted

  2. 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, 2018, accepted

  3. 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, 2018, accepted

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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)

  10. 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

  11. 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

  12. 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

  13. 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. Event-based communication strategy for collaborative navigation with signals of opportunity
    J. Morales and Z. Kassas
    Asilomar Conference on Signals, Systems and Computers, Oct. 28-231, 2018, Pacific Grove, CA, accepted (invited)

  2. 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, accepted

  3. 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, accepted

  4. 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, accepted

  5. 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, accepted

  6. 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, accepted

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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)

  14. 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

  15. 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

  16. 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

  17. 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)

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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

  27. 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

  28. 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

  29. 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

  30. 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)

  31. 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

  32. 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

  33. 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

  34. 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

  35. 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

  36. 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

  37. 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. Lane-level navigation system for ground vehicles with lidar and cellular signals
    Z. Kassas, M. Maaref, and J. Khalife
    U.S. Patent Application No. 62/663,209, Filed: Aug. 23, 2018

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

  3. Event-triggered communication scheme for crowdsourced signals of opportunity aided inertial navigation system
    Z. Kassas and J. Morales
    U.S. Patent Application No. 62/663,198, Filed: Apr. 26, 2018

  4. 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. 62/663,203, Filed: Apr. 26, 2018

  5. 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

  6. 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

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

  8. 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

  9. 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

M.S. Theses and Ph.D. Dissertations

  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, December 2018

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

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