毫米波雷达直升机旋翼回波匹配滤波研究

针对低重频毫米波雷达直升机旋翼回波信号检测中旋翼回波信噪比低的问题，本文采用发射大时宽带宽的线性调频信号，接收匹配滤波处理以增加旋翼回波信号的信噪比，并推导了线性调频旋翼回波模型。由于旋翼旋转对雷达回波产生调幅效应，使其对线性调频匹配滤波器失配，造成信噪比的下降。本文利用匹配滤波的概念，用旋翼匹配滤波器组近似达到了旋翼匹配滤波的性能，提高后端旋翼回波检测的信噪比。

Research on Matched-Filtering of MMW Radar Echoes from Helicopter Blades

The SNR of the helicopter blade echoes is small when the MMW radar has low pulse repetition frequency. In this paper, we put forward that the radar can transmit the LFM signal with wide band and long time and apply the matched filter to the signal processing to enhance the SNR of the helicopter blade echoes. The model of LFM echoes of helicopter blades is deduced. The effect of amplitude modulation due to blade rotations make the echo signals of blades cannot match the LFM matched filter and descend the SNR of output. We use the concept of matched filter and design a blade echo matched filter bank, which achieves the approximate performance of blade echo matched filter and increases the SNR for detection of blade echo.