基于TMS320C6678的实时SAR成像算法实现-信号与信息处理专业论文.docxVIP

摘 要 合成孔径雷达（SAR）不受时间、天气、地域等因素影响，具有全天时、全 天候和作用距离远等特点，广泛应用于目标识别和定位、战场侦察监视、自然灾 害预报以及资源勘探等军事和民用领域。SAR 成像信号处理的特点是数据量大、 成像算法复杂、实时性要求高等。传统的 SAR 成像实时信号处理系统大多是基于 FPGA+多片单核 DSP 构架，DSP 负责雷达成像核心算法部分的实现，但是现有的 单核 DSP 处理能力有限不能满足 SAR 成像的实时性要求，而多片 DSP 互连的结 构不仅占用板卡空间，还大大增加了整个系统的功耗，并且给资源的共享和程序 的 实 现 都 带 来 很 大 的 难 度 。 本 文 致 力 于 构 建 一 种 基 于 高 性 能 多 核 DSP TMS320C6678 的 SAR 成像实时信号处理系统。C6678 的高性能和低功耗为 SAR 成像系统带来了较大的提升空间。 本文将简要介绍 SAR 成像算法的一般性原理，并给出基本的 RD 算法和相位 梯度自聚焦算法流程。在 TMS320C6678 体系结构上，基于多核导航器和 EDMA 等基本模块，我们将分别详细的给出两种算法的软件并行实现方法，并分析仿真 结果，以验证系统的可行性。 关键字： 雷达信号处理 SAR TMS320C6678 PGA ABSTRACT SAR (Synthetic Aperture Radar) is unaffected by the time, weather and terrain. It has the characteristics of day and night, all-weather and long range. Thus, SAR has been widely applied in the areas of military and civil such as target recognition and location, battlefield reconnaissance, disaster forecast, resource mapping and so on. The features of SAR imaging is large amount of data, complex arithmetic and high requirements for real-time processing. The traditional real-time signal processing system for SAR imaging is mostly based on FPGA and multiple single core DSP’s. DSP is in charge of realizing the core algorithm of SAR imaging. However, the single core DSP available can’t meet the requirement for real-time signal processing due to its limited processing ability. While the structure of multiple DSP’s connecting with each other not only occupies most of space in the board, but also increases the consumptions of the whole system. In addition, it makes resources sharing and programs implementing more difficult. This thesis is committed to building a new real-time signal processing system for SAR imaging based on the multi-core DSP TMS320C6678 which is of high-performance. The high performance and low-power consumption of C6678 makes a huge improvement in SAR imaging system possible. This thesis will briefly introduce the general principle of SAR imaging algorithm first. Then the process flows