移频键控信号测量系统设计

为了提高铁路机车中移频键控信号的测量精度,给出了一种利用FPGA和ARM处理器测量频率的方法。该方法在FPGA中利用量化时钟实时测量一组FSK信号周期长度,并将测量数据存储在FPGA内部设计的双口RAM中。FPGA通过设计的串口模块将测量数据送给ARM处理器,ARM处理器对产生测量误差的主要原因进行分析,并对上、下边频切换时产生的畸变数据进行处理,给出了时间间隔测量误差的分析和补偿方法。实验表明,该系统具有较好的抗扰动能力,能够满足一般工业现场测试速率和精度的要求。

The measurement system of frequency shift keying signal

To improve the accuracy of measuring track circuits FSK signal, a method was put forward by implemented with FPGA and ARM processor. The method was used to measure FSK signal period in real-time by quantization clock, and store the measurement data in dual-port RAM which was designed in FPGA, and then FPGA send measurement data via serial port module to ARM processor. By ARM processor, the main reasons for FSK measure errors were analyzed, and the distortion data in switching frequency was analyzed and comp...