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电子学报  2012 

DCT变换域滤波码捕获方法

DOI: 10.3969/j.issn.0372-2112.2012.10.037, PP. 2122-2126

Keywords: 码捕获,检测,离散余弦变换,虚警概率,检测概率

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Abstract:

针对较小时频不确定度的卫星信号捕获,提出了一种结合离散余弦变换(DCT)的码捕获算法.首先对信号进行部分匹配滤波(PMF),然后对各个码相位对应的PMF输出矢量进行DCT变换域滤波及信号重构,最后对信号进行基于能量的检测.由于PMF输出信号和噪声时变特性不同,滤波重构后信号能量几乎无损,而噪声能量得到了明显降低,从而提高了相同虚警概率下的捕获概率.理论分析和仿真结果表明本文检测算法可以有效提升检测概率,并且具有较低的复杂度.

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