基于国产DSP的步进频率综合宽带处理

Stepped Frequency Synthesis Processing Based on Domestic Digital Signal Processor

步进频率综合宽带技术是一种易于雷达工程实现的距离高分辨技术。但步进频率工作体制对目标的运动十分敏感,若不作速度补偿处理则最终综合成像处理结果将发生错误,因而步进频率综合宽带处理需包含速度补偿等一系列关键处理流程。首先阐述了步进频率综合宽带距离像的原理以及目标运动带来的影响,分析信号处理整体流程并提出基于相位差分-IFFT的速度估计算法。依据国产"魂芯一号"DSP平台进行最优化软件设计,提供了一种基于国产DSP的步进频率综合宽带处理实时系统方案。

Stepped frequency synthesis processing technology is a method easily realized in radar projects to obtain high-resolution range profile.However,the stepped frequency radar is sensitive to the target motion,so the synthesis processing without velocity compensation leads to the final imaging results with errors.As a result,the stepped frequency synthesis processing contains a series of important processing steps such as velocity compensation.In this paper the basic theory of the stepped frequency synthesis for range profile imaging and the impact of target motion are introduced firstly.And the overall signal processing procedures are discussed.A novel algorithm based on phase difference-IFFT is proposed for velocity estimation.The signal processing software design is optimized according to the domestic digital signal processor platform called BW100.A design scheme of real-time stepped frequency synthesis processing system based on domestic digital signal processor is presented.