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中文摘要：
提出了大斜视双基地SAR的二维可分离成像算法。首先建立了大斜视双基地SAR回波信号模型,并对其距离徙动和方位调频率的变化特性进行了分析;在此基础上,将二维可分离成像算法推广应用到了双基地SAR领域,解决了大斜视双基地SAR回波信号线性距离徙动补偿后方位调频率在方位向出现的空变性问题。算法采用了由平移不变双基地SAR几何关系所确定的新匹配函数,并考虑了3次相位项对成像效果的影响,改善了成像的效果。最后通过点目标仿真验证了算法的有效性。
英文摘要：
The two-dimensional separated approach for high squint bistatic SAR imaging is proposed.Firstly,the signal model of the high squint bistaitc SAR is constructed,and the characters of its range migration and the change of the azimuth Doppler modulation rate are analyzed.Based on these,the two-dimensional separated approach for high squint bistaitc SAR is presented,and the change of the azimuth Doppler frequency modulation rate brought by the linear range migration compensation is compensated.Then,the new matched functions are deduced according to the translational invariable bistatic SAR geometry,and the third order phase item of the returned signal is also considered to enhance the imaging effect. Finally,the new approach is verified by computer simulations.
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