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近年来,近空间受到了越来越广泛的关注。近空间飞行器兼具卫星和航空飞机的优点,能提供类似卫星的宽覆盖、长续航能力和飞机的快速响应能力,这为研究新体制遥感技术创造了条件。基于此,文章提出了一种基于近空间平台的被动双站合成孔径雷达(SAR)成像方法。首先,通过分析近空间被动双站SAR的空间几何模型,建立了其相应的SAR回波信号模型;然后,根据发射机和接收机对成像目标产生的多普勒效应,对近空间被动双站SAR成像的距离分辨率和方位分辨率进行了分析和仿真,并分析了近空间被动双站SAR存在的方位向调频率空变特性。最后,以接收机静止模式为例,对其成像处理进行了仿真。理论分析和仿真实验结果表明,近空间被动双站SAR是一种具有良好应用前景的遥感新技术。
In recent years, near space has received more and more attention. Near-space vehicles combine the advantages of satellites and aeronautic aircraft with the ability to provide satellite-like coverage, long battery life, and fast response to aircraft, creating the conditions for the study of the remote sensing technology of the new regime. Based on this, a passive dual-station synthetic aperture radar (SAR) imaging method based on near-space platform is proposed. Firstly, by analyzing the space geometry model of near-space passive bi-station SAR, the corresponding SAR echo signal model is established. Then, based on the Doppler effect of the transmitter and receiver on the imaging target, The resolution and azimuth resolution of SAR imaging are analyzed and simulated, and the space-time modulation frequency space-to-frequency variation of near-space passive dual-station SAR is analyzed. Finally, taking the receiver still mode as an example, the imaging processing is simulated. Theoretical analysis and simulation results show that near-space passive dual-station SAR is a new remote sensing technique with good application prospects.