用LH9124开发通用FFT模板及其在SAR实时成像处理中的应用

Using LH9124 in SAR Real Time Image Processor & Design for F9124 DSP Board

新一代高分辨率、远作用距离机载合成孔径雷达（ＳＡ）成像侦察系统中，作为实时成像处理器核心运算部件的高速ＤＳＰ模板的研制是最为关键的一环，其他关键技术的方案和实现在很大程度上由它来决定。在ＳＡＲ成像中所使用的时域一频域快速相干算法以ＦＦＴ为时频变换工具，ＳＨＡＲＰ公司的ＤＳＰ专用芯片ＬＨ９１２４及其配套芯片ＬＨ９３２０可以完成相应的高速ＦＦＴ运算。本文介绍了采用ＬＨ９１２４／ＬＨ９３２０实现ＤＳＰ运算的几种方案及Ｆ９１２４通用ＦＦＴ模板的研制，主要用于完成ＳＡＲ实时成像处理器方位多视处理过程的运算，通过合理配置可适用于其它需要高速ＤＳＰ运算的场合．本文还概述了如何将ＬＨ９１２４／ＬＨ９３２０与ＴＭＳ３２０系列ＤＳＰ器件配合使用完成ＳＡＲ实时臧像方位处理的方案。

High speed digital signal processing (DSP) in the real-time image processor (RTIP) is key for the high resolution, long-distance synthetic aperture redar (SAR) system. Other techniques used in SAR RTIP depend on the DSP to a great extent. FFT is used as the transform method of time domain-frequency domain quickly correlated algorithm. LH9124 and LH9320 introduced here are the special chips that can be used for FFT. This paper introduces some design schemes and the self-designed F9124 general circuit bond using LH9124. THis board is mainly used in the azimuth multi-look processing in the real time image processor and can be used in many other cases if disposed properly. THis paper the introduces the scheme using LH9124/Lh9320 with TMS320 to realize the azimuth processing in SAR RTIP.