基于高分三号卫星的星载无人机双基前视SAR系统设计

System Design for Bistatic Forward-looking SAR Based on GaoFen-3 Satellite as Transmitter and Unmanned Aerial Vehicle as Receiver

高分三号卫星是我国首颗全极化C波段高分辨率SAR成像卫星。文章提出一种以高分三号卫星为辐射源的无人机双基前视SAR系统。对典型双基构型参数下的成像分辨率、分辨率夹角、图像信噪比等指标进行理论分析。所设计的星载-无人机载前视SAR系统,成像场景中心地距分辨率为0.8m,多普勒分辨率为2m,分辨率夹角约为85°,SNR约为52dB,并通过计算机仿真实验,验证了理论分析的正确性和有效性。文章所提出的系统设计方法为星载-无人机载前视SAR高分辨率目标侦察、飞机着陆指引等应用提供解决方案。

GaoFen-3 satellite is the first full polarization,high resolution SAR satellite of China,which works with C band. A bistatic forward-looking SAR is researched with the GaoFen-3 SAR as the illuminator and an unmanned aerial vehicle (UAV) as the receiving platform.With the typical bistatic configuration,the performance parameters such as the imaging resolution,the angle between range resolution and Doppler resolution,SNR et al,are analyzed. A spaceborne-UAV bistatic forward-looking SAR was designed with the proposed method.The target located in the scene center has a range resolution about 0.8m,Doppler resolution about 2m,the angle between the two dimensional resolutions about 85 degree and SNR about 52dB.The correctness and validity of the analysis are verified through computer simulations.The proposed system provides the proof for spaceborne-UAV forward looking SAR system design, and a solving scheme for forward looking high resolution surveillance and airplane landing guide as well.