一种高动态环境下PCM-FM的低信噪比检测方法

A low SNR detection method of PCM-FM signal in high dynamic situation

摘要:

针对 PCM-FM 遥测信号的特点，提出一种基于快速傅里叶变换的自相关检测方法。首先利用自相关处理， 消除多普勒频率变化对检测性能的影响，可适应目标高动态变化环境。然后通过对自相关输出进行快速傅里叶变换，提高在低信噪比情况下的检测性能。仿真结果表明所提方法在高动态、低信噪比条件下能够高概率检测到 PCM-FM 信号。

Abstract:

Considering the characteristic of Pulse Code Modulation-Frequency Modulation (PCM-FM) signal, a Fast Fourier Transform (FFT) based autocorrelation detection method is proposed. Firstly, this method can adapt to high dynamic situation by using autocorrelation processing to eliminate the influence of Doppler frequency change on detection performance.Then the detection performance of proposed method is improved under the condition of low SNR by FFT of autocorrelation output. The simulation result shows that high probability detection of PCM-FM signal at low SNR and high dynamic situation can be realized by the proposed method.