基于FFT的微弱GPS信号频率精细估计

doi:10.11999/JEIT150204

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Abstract

The frequency pull-in process of traditional GPS receiver is time-consuming and its success rate is low under weak GPS signal environments. In order to solve this problem, FFT-based fine frequency estimation methods are presented. To overcome data bit phase transition, new input variables of FFT are constructed by using the squaring or differential algorithm. The experimental results show that the frequency detection probability is above 95% using differential algorithm when C/N₀=21 dBHz if prior information of the navigation data is unknown. The frequency detection probability is above 95% using squaring algorithm when C/N₀=19 dBHz if prior information of the navigation data is known.

Key words： GPS FFT Frequency pull-in Fine frequency estimation

Received: 03 February 2015 Published: 29 June 2015

PACS:

TN967.1

Corresponding Authors: Ba Xiao-hui E-mail: baxiaohui@ime.ac.cn

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	Articles by authors
	Zhang Hong-lun
	Ba Xiao-hui
	Chen Jie
	Zhou Hang

Cite this article:

Zhang Hong-lun,Ba Xiao-hui,Chen Jie等. FFT-based Fine Frequency Estimation for Weak GPS Signal[J]. JEIT, 2015, 37(9): 2132-2137.

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http://jeit.ie.ac.cn/EN/10.11999/JEIT150204 OR http://jeit.ie.ac.cn/EN/Y2015/V37/I9/2132

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