GPS Pull-In Search using Reverse Directional Finite Rate of Innovation (FRI)

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When an incoming Global Positioning System (GPS) signal is acquired, pull-in search performs a finer search of the Doppler frequency of the incoming signal so that phase lock loop can be quickly stabilized and the receiver can produce an accurate pseudo-range measurement. However, increasing the accuracy of the Doppler frequency estimation often involves a higher computational cost for weaker GPS signals, which delays the position fix. In this paper, we show that the Doppler frequency detectable by a long coherent auto-correlation can be accurately estimated using a complex-weighted sum of consecutive short coherent auto-correlation outputs with a different Doppler frequency hypothesis, and by exploiting this we propose a noise resistant, low-cost and highly accurate Doppler frequency and phase estimation technique based on a reverse directional application of the finite rate of innovation (FRI) technique. We provide a performance and computational complexity analysis to show the feasibility of the proposed technique and compare the performance to conventional techniques using numerous Monte Carlo simulations.
Publisher
The Korean GNSS Society
Issue Date
2014-09
Language
English
Citation

Journal of Positioning, Navigation, and Timing, v.3, no.3, pp.107 - 116

ISSN
2289-086
DOI
10.11003/JPNT.2014.3.3.107
URI
http://hdl.handle.net/10203/199143
Appears in Collection
GT-Journal Papers(저널논문)
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