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为了解决机场跑道的异物检测的信号处理问题,给出了一种基于快速傅里叶的线性调频连续波信号处理方案。该方法通过对回波信号采样混频后1路通过低通滤波器滤波,输出信号经过SFC和放大器后经过FFT得到频率幅度谱。通过和杂波图比较可以发现是否存在异物。仿真结果表明此方法可以有效的提高回波的距离分辨率,提高发现异物的概率,其技术指标满足机场检测系统的要求。
In order to solve the problem of signal processing of foreign object detection in airport runway, a fast Fourier-based LFMCW signal processing scheme is presented. The method filters the echo signals through a low-pass filter after being mixed and the output signal passes through the FFT and the amplifier to obtain the frequency amplitude spectrum. By comparison with the clutter map can be found whether there is foreign body. The simulation results show that this method can effectively improve the distance resolution of echo and improve the probability of finding foreign objects, and its technical indexes meet the requirements of airport inspection system.