针对被动式毫米波测速系统对测速信号处理不精确导致测速精度不高的问题，提出了改善系统硬件电路和软件程序以提高被动式毫米波测速精度的方法。该方法根据辐射计输出模拟信号的电压及频率规律，设计出合理的硬件电路对信号进行相关处理以增强信号的可读性，然后利用 TMS320F28335芯片对处理后的信号进行特征提取、设置对应的判别门限阈值以及对采集的数据进行快速计算。实验表明采用该方法对输出的模拟信号具有较好的处理能力，使得直接检波式辐射计的输出信号在示波器中有良好的可识别波形，利用该信号测得移动金属速度误差小于2%。%Aiming at passive millimeter wave velocity measuring system for speed signal processing inaccurate result in speed measuring precision is not high,a system of hardware circuit and software program in order to improve the passive millimeter wave speed measuring precision was proposed.According to the radiometer out-put analog signal voltage and frequency regulation,a reasonable hardware circuit of signal processing was de-signed to enhance the readability of the signal,then the TMS320F28335 chip was used for featuring extraction of the signal processing,corresponding discriminant threshold and fast calculation of data acquisition was set.Ex-periments showed that,by using the method of output analog signal,the method had a good ability to make di-rect detection radiometer output signal in the oscilloscope,which had good identifiable waveform,and the sig-nals of measured mobile metal velocity error was less than 2%.
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