基于FPGA和单片机技术的FSK信号监测

FSK是铁路运行系统中的速度控制信号，为确保信号精度，运用FPGA和单片机技术设计了基于FSK信号特征和各项技术指标的实时监测软、硬件系统；通过对FSK信号测量数据的理论分析，建立了FSK信号低频、载频、相位数据的解算方法，通过实验数据验证，说明该方法简单、可行，实现了对FSK信号质量的有效检测。

Inspecting FSK signal based on MCU and FPGA

FSK(Frequency-Shift Keying) is one of the most important control signals used in railway system therefore its accuracy should be confirmed all the time.This function is achieved by an inspecting system described in this paper.The hardware of the system is based on FPGA and MCU technology therefore the precision of the data measured from FSK signals is increased.Regulation about several important parameters such as low frequency, carrier frequency and phase is analysed in detail.The algorithm used here is in time domain to achieve simpicity instead of in frequency domain such as FFT. Both theoretic reasoning and the experiment results proved that the system is efficient and accurate.This method is especially befit to inspect the signal which is just created in a square wave without any process and to ensure the accuracy of the FSK creation system.The hardware resource of the system can also be shared with the FSK signal creation system.A simple and efficient algorithm used in the software of the system is presented which is verified by experiment.