机载SAR半实物快速回波模拟设计及实现

合成孔径雷达(SAR)回波模拟计算量大、用时长,快速的实现SAR回波模拟非常有利于SAR系统的研制。设计了一种基于FPGA的通用雷达快速回波模拟半实物平台;同时为了快速实现SAR回波模拟,改进了基于等效散射体回波模拟算法;考虑到算法的并行运算,优化了可编程逻辑器件(FPGA)硬件实现流程,实现了点目标和自然场景的SAR回波快速模拟并提供高精度的回波数据。实际应用结果表明,设计的通用SAR回波模拟平台能够依据不同的SAR仿真需求快速地模拟回波信号,满足对SAR系统评估测试要求。

Design and Realization of Fast Airborne SAR Echo Simulation Based on Hardware-in-Loop

The SAR echo simulation has high computational complexity and costs.The fast SAR echo simulation facilitates the study of SAR system.A general hardware-in-loop simulation platform based on FPGA is presented in this paper.In order to implement SAR echo simulation quickly,an improved echo simulation algorithm in terms of equivalent scatterer is adopted to obtain fast computation.Considering that the computation has the characteristic of regulation,the fast airborne SAR echo simulation platform based on field programmable gate array（FPGA） can generate the point target and the SAR echo simulation of natural scene in quasi-real-time way and provide high accuracy SAR echo data.The application results show that the SAR echo simulator can produce echo signal quickly and satisfy the need of SAR system＇s research and analysis.