SAR成像应用特征分析及硬件设计空间讨论

Analyzing SAR imaging application feature and discussing hardware design space

合成孔径雷达SAR是一种主动式的对地观测系统。近年来SAR逐渐朝着多平台化发展,陆续出现了在无人机、探测车等小型移动平台上。SAR成像是运行在SAR上的成像程序,由于新的特殊运行环境的出现、其对低能耗和高算力有了更严格的要求。如何针对特定的平台,提供高性能、低功耗的应用支持,便成为其核心要点。对SAR成像计算和访存等特征进行了分析,针对性地进行了程序优化并测试了该程序在x86平台上的性能,以获得可靠的性能参考。在此基础上,面向DSP+FFT加速器的硬件结构,构建了一个算力配比数学模型,为硬件设计提供解决方案。

SAR(Synthetic Aperture Radar),or synthetic aperture radar,is an active earth observation system.In recent years,SAR has gradually developed towards multi-platform,and has appeared on small mobile platforms such as unmanned aerial vehicles and probe vehicles.SAR imaging is an imaging program running on SAR.Due to the emergence of a new special operating environment,it has stricter requirements for low energy consumption and high computing power.How to provide high-performance,low-power application support for a specific platform has become a core point.This paper analyzes the characteristics of SAR imaging calculation and memory access,and specifically optimizes the program and tests the performance of the program on the x86 platform to obtain a reliable performance reference.On this basis,oriented to the hardware structure of the DSP+FFT accelerator,a mathematical model of computing power ratio is constructed to provide a solution for hardware design.