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国产18信息轨道电路和UM-71系列无绝缘轨道电路是我国铁路的主流制式,其调制方式均为FSK(移频键控)。而准确快速测量调制频率是列车安全调度的首要条件。为提高信号频率检测的实时性和精度,检测算法设计中将欠采样技术应用到常规ZFFT算法中,实现软件程序的优化,提高检测速度。在基于DSP TMS320VC5402构建的检测平台上实现此算法。实验表明:此优化的ZFFT算法抗干扰性强,检测精度高,实时性满足实际要求。
Domestic 18 information track circuit and UM-71 series of non-insulated track circuit is the mainstream of our railway system, the modulation are FSK (FSK). The accurate and rapid measurement of modulation frequency is the primary condition of train safety regulation. In order to improve the real-time performance and accuracy of signal frequency detection, the under-sampling technique is applied to the conventional ZFFT algorithm in the design of detection algorithm to optimize the software program and improve the detection speed. This algorithm is implemented on the detection platform based on DSP TMS320VC5402. Experiments show that this optimized ZFFT algorithm has strong anti-interference ability, high detection accuracy and real-time performance to meet the actual requirements.