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提出了一种基于单芯片的ZPW-2000A型铁路移频信号检测的方案。通过引入FIR数字滤波技术实现ZPW-2000A信号的主副频信号分离,使用频谱分析的方法检测移频信号的调制低频信息和上下边频信息,结合欠采样技术和Zoom-FFT技术提高低频频谱分辨率,用能量重心法校正上下边频的检测准确度,并将这种算法应用在ARM处理器上,实现了利用单芯片对移频信号的检测。测试结果表明上下边频检测误差不超过0.2Hz,调制低频检测误差不超过0.02Hz,该方案能提高铁路移频信号检测的精度,具有高集成度和高可靠性。
A scheme based on single-chip ZPW-2000A railway frequency-shift signal detection is proposed. The main and auxiliary signals of ZPW-2000A signal are separated by introducing FIR digital filtering technology. The modulation low frequency information and the upper and lower side frequency information of the frequency-shifted signal are detected by spectrum analysis. The combination of undersampling technology and Zoom-FFT technology is used to improve the low frequency spectrum resolution Rate, with energy center of gravity method to correct the upper and lower side frequency detection accuracy, and this algorithm is applied to the ARM processor, the use of a single chip to achieve the detection of frequency-shifted signals. The test results show that the upper and lower side frequency detection error does not exceed 0.2Hz and the modulation low frequency detection error does not exceed 0.02Hz. This scheme can improve the accuracy of railway frequency shift signal detection with high integration and high reliability.