基于浮点DSP的轨道信号开发平台的研究

针对轨道信号处理系统中面临的CPU换代和信号解调实时性差的问题,构建了一个轨道信号开发平台。系统核心处理器采用TI公司的高性能双核浮点处理器OMAPL138,轨道信号产生模块采用数字信号处理器(]DDS)AD9831,通过A/D变换器AD7865采集信号,经UART串口实现人机交互。轨道信号解调算法采用基于快速傅里叶变换(FFT)和频域抽取(ZFFT)的频谱分析法,检测信号的载频和调制频率。测试结果表明,载频检测误差不超过0.1 Hz,调制频率检测误差不超过0.12 Hz,该方案大大改善了轨道信号解调算法的空间,提高了解调速度。

Research on Track Signal Development Platform Based on Float DSP

To solve the problems of CPU's updating and poor real-time processing in the track signal system,a new development platform is designed.TI's high performance dual-core floating-point DSP OMAPL138 is adopted as the core processor,DDS is used to send the track signal,A/D convertor AD7865 is used to collect data and UART is used to communication.As for software algorithms,spectrum analysis based on FFT and ZFFT is applied to detect the carrier and modulation frequency.The test results show that the carrier frequency error is less than 0.1 Hz and modulation frequency error is less than 0.12 Hz.The space and speed of rail signal demodulation algorithm can be greatly improved.