一种简易的LFM脉冲雷达动目标检测方法

A simple method on LFM pulse radar moving target detection

采用脉冲压缩与DMTI以及FFT滤波器组级联的信号处理方案,实现线性调频(LFM)脉冲雷达的动目标检测.先将LFM回波信号进行脉冲压缩,再采用数字动目标显示(DMTI)技术进行一次对消以抵消固定杂波,然后用FFT滤波器组对动杂波进行抑制并改善低速目标的信噪比.仿真结果表明:与单纯采用DMTI技术相比,系统输出信噪比明显提高;与单纯采用FFT滤波器组相比,级联DMTI后,地杂波被大幅度抑制,低速目标输出信噪比有所下降,高速目标输出信噪比进一步提高.

A simple LFM Pulse RADAR MTD signal processing scheme,which the pulse compression filter was cascaded by DMTI filter,and then cascaded by FFT filter groups,was presented in this paper. Firstly, the echo signal was processed by using pulse compression technique, then the single pulse cancellation DMTI filter was employed to cancel the fixed target. Basing on this,the FFT filter groups were used to reduce the moving clutter and improve the signal-to-noise（SNR） ratio of slow speed target. The simulated results indicate that the output SNR is improved clearly compared to the case that only the single DMTI filter is employed. After the FFT filter groups are cascaded by DMTI,the fixed clutter is canceled greatly,the slow speed target signal is reduced and the high speed target is enhanced.