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

• Published in: Journal of Positioning, Navigation, and Timing Vol. 3; no. 3; pp. 107 - 116
• Main Authors: Kong, Seung-Hyun, Yoo, Kyungwoo
• Format: Journal Article
• Language: English
• Published: 사단법인 항법시스템학회 15.09.2014
• Subjects: 기타공학
• DOI: 10.11003/JPNT.2014.3.3.107
• ISSN: 2288-8187

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. KCI Citation Count: 0