基于TMS系列DSP实现LFM信号的实时脉冲压缩

研究了以定点通用型DSP芯片TMS320VC5509为硬件核心的LFM信号实时脉冲压缩技术。在CCS 3.3软件开发平台上实现,采用C语言编程,结合Matlab仿真得到LFM信号和匹配滤波器的系数,在时域实现脉冲压缩算法。为有效抑制副瓣的影响,采用海明窗加权函数对滤波器进行调制。采用单位阶数耗时衡量滤波算法,通过增加滤波模块接口的方法对数据存储更新方式进行优化,并结合FIR滤波器的特性简化了卷积算法。测试表明,系统工作稳定,处理精度和实时性均达到了较高标准,可以满足工程应用的要求。

Real-time pulse compression of LFM signal based on TMS DSP

This paper researches real-time pulse compression technique of LFM signal with fixed-point general purpose DSP chip TMS320VC5509 as its core hardware.With C programming language on the software platform of CCS 3.3,coupled with the LFM signal and matched filter coefficients generated by the simulation of Matlab,the pulse compression algorithm is realized in the time domain.In order to reduce side lobes,Hamming weighting function is adopted to modulated the filter.The system introduces unit order timing to measure the performance of the filter.The data storage and updating method is optimized by adding an interface to the filter module,and the convolution algorithm is simplified using the character of FIR filter.Final test shows that the system has high stability,and achieves high standard both in accuracy and real-time quality,which can meet the requirement of engineering application.