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High Accuracy GPS Phase Tracking Under Signal Distortion

Kalyanaraman, Sai K.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1251221460

Abstract Details

2009, Doctor of Philosophy (PhD), Ohio University, Electrical Engineering (Engineering and Technology).
Array signal processing is a viable method to provide protection against interference to the desired GPS (Global Positioning System) signal. Adaptive array processing can also be used to provide GPS multipath mitigation. As reported in the literature (Hatke, 1998), adaptive nulling to suppress interference can cause errors in the carrier phase and code phase measurements. The output of multi-element controlled reception pattern antennae (CRPA) may be subject to sizeable variations in phase patterns that arise from the application of non-trivial time varying adaptive array weights (Moelker, 1998). Part of this phase distortion can be compensated in the carrier phase tracking loop of the baseband GPS receiver processing. Classical approaches implement constrained beam steering mechanisms to control the phase of the array in the look direction. An alternative approach, using unconstrained adaptive array processing with compensation for the subsequent phase distortion of the GPS signal is demonstrated by the use of a software radio with results to support the theory. This unconstrained adaptive array implementation does not require attitude information and obviates the need for an attitude sensor such as an inertial reference unit. In addition to addressing carrier phase distortions due to adaptive array processing, this body of work evaluates the carrier phase distortion resulting from GPS signal multipath. Phase multipath characterization is performed for GPS receiver architectures that use typical baseband receiver processing designs (using coherent and non-coherent code tracking loops). Prior to this effort, scant attention had been given to validating carrier-phase multipath theory against GPS data (Brodin, 1996). A comprehensive phase multipath equation (Braasch & Van Dierendonck, 1999) which captures the true nature of carrier multipath is presented. Validation of this equation is carried out for wide and narrow correlator spacing within coherent and non-coherent code tracking architectures by comparing bench test data to theoretical predictions. In addition, data collected for non-zero multipath phase rates are presented. The impact of GPS receiver architecture on the mitigation of phase-rate multipath will be discussed.
Michael Braasch, Ph.D. (Advisor)
Maarten Uijt de Haag, Ph.D. (Committee Member)
Gary McGraw, Ph.D. (Committee Member)
Frank van Graas, Ph.D. (Other)
James Rankin, Ph.D. (Committee Member)
Daniel Phillips, Ph.D. (Committee Member)
William Kaufman, Ph.D. (Committee Member)
139 p.
Electrical Engineering
GPS; Adaptive Array; MVDR; MV; CRPA; Carrier Phase; Multipath; Code Tracking

Recommended Citations

Citations

  • Kalyanaraman, S. K. (2009). High Accuracy GPS Phase Tracking Under Signal Distortion [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1251221460

    APA Style (7th edition)

  • Kalyanaraman, Sai. High Accuracy GPS Phase Tracking Under Signal Distortion. 2009. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1251221460.

    MLA Style (8th edition)

  • Kalyanaraman, Sai. "High Accuracy GPS Phase Tracking Under Signal Distortion." Doctoral dissertation, Ohio University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1251221460

    Chicago Manual of Style (17th edition)

ohiou1251221460
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© 2009, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.