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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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弱信号P码直捕方法研究
Keywords: 弱信号,P码直捕,全球定位系统,快速傅里叶变换
Abstract:
提出了一种新的基于快速傅里叶变换(FFT)的P码直捕方法,并采用TS201对其进行了具体实现.该方法采用时间分格将大的P码时间不确定度分割成若干小的时间分格,并配合外部存储器的使用,有效减少了直捕过程中FFT的次数,并且可实现各种灵活的捕获策略.分析了低信噪比下非相参积累后的捕获概率及虚警概率,提出了基于两次检测的"A+B"检测方法,既保证了检测性能,又降低了捕获时间.性能分析结果显示,该方法能够在60s内完成捕获信噪比为-32dB,时间不确定度为±1s的P码直捕.
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