基于TMS320C6701的机载SAR方位向处理的实时实现

Real-time Implementation of Azimuth Compression for Airborne SAR Using C67 High-speed DSP

机载合成孔径雷达可以在载机飞行的同时获得高分辨率合成孔径雷达图像。由于合成孔径雷达成像具有很多原理性优点,它在军事和民用领域都取得了广泛的应用。方位处理是合成孔径雷达成像算法中重要的一步,由于算法本身的复杂性和雷达数据的高速率,方位向处理的实时实现具有很大的挑战性。介绍了自主研发的、采用TIC67DSP作为核心处理芯片实现方位向处理的高速信号处理系统。通过优化的结构设计和软件流程,有效保证了硬件资源的利用效率,成功实现了设计目标。

Airborne SAR could gain high-quality image during aircraft flight. Due to its theoretical advantages, SAR imaging has been widely applied in both military and civilian areas. Range and azimuth processing are the two crucial steps of SAR imaging. The major challenges of real-time implementation with digital signal processing techniques lie in the algorithm complexity and high data rate of radar systems. This paper describes a high-speed DSP system based on C67 to realize real-time azimuth compression of Range-Doppler imaging algorithm. Through optimized board structure and software programming, processing system's data throughput is greatly enhanced. Both experimental simulation and field flight have shown that this system is successful.