基于FFT的微弱GPS信号频率精细估计

张洪伦; 巴晓辉; 陈杰; 周航

doi:10.11999/JEIT150204

基于FFT的微弱GPS信号频率精细估计

doi: 10.11999/JEIT150204

基金项目:

国家自然科学基金(61221004)

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出版历程
- 收稿日期: 2015-02-03
- 修回日期: 2015-05-11
- 刊出日期: 2015-09-19

FFT-based Fine Frequency Estimation for Weak GPS Signal

摘要

摘要: 为了解决传统GPS接收机对弱信号频率牵引速度比较慢、成功率较低的问题，该文提出基于FFT的频率估计方法。为了克服导航数据比特反转带来的影响，用平方法和差分法分别构造的新变量作为FFT运算的输入。实验结果显示，没有比特边沿先验信息的情况下，差分构造变量的方法在21 dBHz弱信号时正确估计频率概率在95%以上，有比特边沿先验信息的情况下，平方构造变量的方法在19 dBHz弱信号下正确检测频率概率仍能达到95%。
- GPS /
- FFT /
- 频率牵引 /
- 频率精细估计
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.
- GPS /
- FFT /
- Frequency pull-in /
- Fine frequency estimation

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参考文献(28)

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