圆周合成孔径雷达因其独特优势已经成为雷达领域的研究热点。分析圆周合成孔径雷达与线性合成孔径雷达在成像区域大小、点散布函数特性、回波频谱特点、三维成像能力等方面的差异，凸显了圆周合成孔径雷达的成像特点。发现单航过圆周合成孔径雷达频域成像处理的难点在于其回波频谱的空变性。为提高频域成像处理的效率，分析了平面圆周合成孔径雷达与多航过圆周合成孔径雷达成像模式，并指出这两种模式易于在频域开展一致化处理。仿真试验证明了分析内容的正确性。%With its intrinsic characteristics,circular synthetic aperture radar has lately become a particular interest to the radar community. The differences of imaging processing between the circular synthetic aperture radar and linear trajectory synthetic aperture radar were compared and analyzed.The detailed comparisons containing the size of the observed area,the properties of the point spread function,and the properties of echo spectrum were carried out.It was learnt that the difficulty of the imaging processing of single-pass circular synthetic aperture radar lies on its space dependence.To overcome this difficulty,the plane circular synthetic aperture radar and multi-base line circular synthetic aperture radar imaging models were analyzed.Simulation test was carried out and the corresponding results prove the proposed analysis is valid.
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