结合毫米波体制和双站毫米波合成孔径雷达(SAR)前视成像技术,开展毫米波双站SAR前视成像算法的研究,在双站SAR前视成像系统中,较大的前视角引入了多普勒质心偏移和严重的距离徙动,因此普通双站SAR的成像算法无法直接移植到双站SAR前视成像中.针对以上问题,论文首先提出了一种基于瞬时多普勒分析的改进Loffeld§Bistatic Formula (MLBF)二维频谱求解方法,相比于现有方法,该方法能更准确的得到双站SAR前视回波信号的二维频谱.在此基础上又推导出了适用于毫米波双站SAR前视成像的Omega-k算法;最后通过仿真实验,验证了提出算法的有效性和优越性.%This paper combines millimeter-wave and bastatic forward-looking synthetic aperture radar (BFSAR) techniques,carrying out the research of imaging algorithms for millimeter-wave BFSAR.However,imaging algorithms for BFSAR are the difficulties in this study.Due to the special forwardlooking geometry,imaging algorithms for bistatic SAR can not be applied to BFSAR directly.So,this paper proposes a modified Loffeldg Bistatic Formula (MLBF).The new method compared with other extended Loffeld's Bistatic Formula (ELBF) can obtain a bistatic point target reference spectrum,which is accurate enough for bistatic forward-looking configuration.Then,an Omega-k algorithm based on the reference spectrum is derived.Finally,simulations validate the accuracy of the MLBF method and the effectiveness of the Omega-k imaging algorithm.
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