基于FFT的微弱GPS信號(hào)頻率精細(xì)估計(jì)
doi: 10.11999/JEIT150204 cstr: 32379.14.JEIT150204
基金項(xiàng)目:
國家自然科學(xué)基金(61221004)
FFT-based Fine Frequency Estimation for Weak GPS Signal
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摘要: 為了解決傳統(tǒng)GPS接收機(jī)對弱信號(hào)頻率牽引速度比較慢、成功率較低的問題，該文提出基于FFT的頻率估計(jì)方法。為了克服導(dǎo)航數(shù)據(jù)比特反轉(zhuǎn)帶來的影響，用平方法和差分法分別構(gòu)造的新變量作為FFT運(yùn)算的輸入。實(shí)驗(yàn)結(jié)果顯示，沒有比特邊沿先驗(yàn)信息的情況下，差分構(gòu)造變量的方法在21 dBHz弱信號(hào)時(shí)正確估計(jì)頻率概率在95%以上，有比特邊沿先驗(yàn)信息的情況下，平方構(gòu)造變量的方法在19 dBHz弱信號(hào)下正確檢測頻率概率仍能達(dá)到95%。
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關(guān)鍵詞:
- GPS /
- FFT /
- 頻率牽引 /
- 頻率精細(xì)估計(jì)
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
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