数字相关技术实现DS信号快捕

Rapid Acquisition of Direct Sequence Signal by Digital Correlation Technique

本文提出了利用数字相关技术实现PN码同步快捕方法。该方法能对不同码型、码长的PN码所调制的BPSKDS信号进行解扩,具有体积小,稳定性好,抗振动性强,易于集成化等特点。适合于信/噪比不很低的突发直扩信号的快速捕获。文章应用《信号检测与估值》理论分析了正交双通道PN码快速捕获的特性,并设计了具体的实现电路模型。从理论上计算了在不同的虚警概率下,检测概率随输入信/噪比的变化曲线。

This paper introduces the rapid synoronous method of pseuclo-noise (PN) code acquired by using the digital correlation technique. In the method, any binary phrase shift keying (BPSK) signal modulated by different types and lengths of PN code can be demodulated. It is characteristic of smallness in size, good stability and powerful anti-shaking strength, and it is easily integrated as well. The author analyses the performance of I,Q channels of PN code rapid acquisition by the theory-Signal Detection & Estimation, designs a concrete circuit model, and thesretically calculates the changing curve of the input S/N ratio of detecting probability under the different probabilities.