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

GPS Pull-In Search using Reverse Directional Finite Rate of Innovation (FRI)
Year	2014
Month
Journal	2014 / Journal of Positioning, Navigation, and Timing vol. 3, no. 3, pp. 107-116
Author	공승현(Seung-Hyun Kong) , 유경우
Link	https://koreascience.kr/article/JAKO201428637715339.page 210회 연결
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.