高分辨力雷达导引头可编程FFT处理器设计

A Programmable FFT Processor Design of High-Resolution Guide Radar

高分辨力雷达导引头采用先进的合成孔径雷达(SAR)进行制导,通过对回波数据的大量积累和实时处理来提高雷达的方位分辨力。其中极为关键的部件就是FFT处理器,它的处理速度是整个数字信号处理系统中的重要指标。为了研制这种高速可编程FFT处理器和满足实时处理要求。本文采用两片TMS320C25芯片设计了一种可编程FFT处理器。当运算点数在128点以内(复数数据)时,通过合理地优化可执行程序代码和安排运算数据,其编程可以达到最高的效率,能够在0.5ms完成128复数点FFT运算(全部过程)。实践表明,效果良好。

High-resolution guide radar improves its azimuth resolution by using synthetic aperture principle and collecting a large number of echoes and processing them in real-time. The very important section in it is FFT (Fast Fourier Transform) processor. The operating speed of FFT processor is one of the important parameters in the whole digital signal processing system. In order to build a high speed FFT processor for high-resolution guide radar real-time processing, this paper gives a design consideration of high speed FFT processor by using two chips of TMS320C25 microprocessor. When the input data points (complex points )is less than or equal to 128, this processor can reach its optimizing speed through simplifying executable program code and arranging input complex points in on-chip RAM. With this processor, a 128 complex-points FFT can be finished in 0.5ms (the whole calculating time). It has been proved by practice that this processor is feasible.