一种高效精确的FMCW SAR动静目标混合场景回波模拟方法

发布时间：2018-11-28 11:43

【摘要】：近几年来,由于小型无人机的兴起,基于FMCW体制的合成孔径雷达(SAR)由于体积小,重量轻,成本低得到了快速发展。然而,由于传统的脉冲SAR中的"停-走"假设不再成立,FMCW SAR成像处理与传统的脉冲SAR有着很大的不同,这样使得在FMCW SAR实测数据进行处理和分析时往往缺乏理论支撑。因此,开展FMCW SAR的信号处理研究具有重要的现实意义和军事价值。目前,国内外关于FMCW SAR的研究主要集中在其成像处理方法上,在回波模拟方向研究甚少,特别是对于既包含分布式运动目标又有静止目标下的真实场景下的FMCW SAR回波快速模拟方法更是鲜有涉及。基于此,该文在FMCW SAR平台脉内连续运动的基础上推导了一种适用于动静目标的精确的FMCW SAR 2维频域模型,并基于该模型提出一种高效精确的FMCW SAR动静目标混合场景回波模拟的方法。点目标和场景目标的仿真试验验证了该模拟方法的有效性,效率分析发现该种模拟方法的效率远高于传统的仿真方法。
[Abstract]:In recent years, due to the rise of small UAVs, (SAR) based on FMCW system has been developed rapidly because of its small size, light weight and low cost. However, the "stop-walk" assumption in the traditional pulse SAR is very different from the traditional pulse SAR, which makes it lack of theoretical support when processing and analyzing the measured data of FMCW SAR. Therefore, the research of FMCW SAR signal processing has important practical significance and military value. At present, the research of FMCW SAR at home and abroad is mainly focused on its imaging processing method, and the research on echo simulation direction is very few. Especially, the fast simulation method of FMCW SAR echo in real scene with both distributed moving target and static target is rarely involved. Based on this, an accurate FMCW SAR 2-dimensional frequency-domain model for dynamic and static targets is derived on the basis of continuous motion in the pulse of FMCW SAR platform. Based on this model, an efficient and accurate echo simulation method for mixed scene of FMCW SAR static and static targets is proposed. The simulation results of point target and scene target verify the effectiveness of the simulation method. The efficiency analysis shows that the efficiency of this simulation method is much higher than that of the traditional simulation method.
【作者单位】：广东第二师范学院物理与信息工程系;
【基金】：国家自然科学基金(61475049)~~
【分类号】：TN958

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