基于DSP双相位检测微弱信号的仿真分析

针对数字信号处理器（DSP）系统集成度高、速度快、适合大量数据实时处理的特点，分析微弱信号的双相位相干检测原理，从应用的角度研究基于DSP实现的双相位检波模式的优点。利用DSP产生精确的相干波，从而使谐波的抑制能力可以达到一120dB。随机噪声中的信号幅值误差可以达到0．45％，相位误差0．228％。构建了一个以DSP为核心高精度的微弱信号检测系统。

The Analysis of Detecting Weak Signal Based on DSP and Dual Phase Method

In this paper,a dual phase correlation method for detecting weak signal based on DSP is introduced.Because the DSP can produce an accurate correlation signal perfectly,the whole detecting system can reduce the harmonic to-120dB when detecting the signal buried in the coherent signals,the amplitude error can be reduced to 0.45% and the phase error to 0.228%.This method can make up a high accurate system for detecting weak signal.