【作者】 宋铁帅； 杨彬； 王俊； 董曌；

【Author】 SONG Tieshuai;WANG Jun;YANG Bin;DONG Zhao;Beihang University;

【机构】 北京航空航天大学；

【摘要】 合成孔径雷达(SAR)在测绘、航空、航天等领域发挥着重要的作用。与脉冲体制SAR相比,调频连续波(FMCW)SAR具有体积小、成本低、分辨率高等一系列优点,采用毫米波体制的FMCW SAR能够对近距离目标进行高分辨成像。在SAR成像处理中,传统的"停-走-停"假设常用于星载或机载平台,而在毫米波频段的FMCW SAR,其快时间占方位向脉冲重复周期比例更大,在收发信号时,雷达平台与目标之间的相对运动往往不能忽略,不能将其假设为"停-走-停"模型。因此,本文研究了非"停走停"假设下SAR中经典的距离-多普勒(RD)算法,通过点目标仿真以及搭建滑轨SAR实测验证了这种连续运动模型下的RD算法的有效性。更多还原

【Abstract】 Synthetic aperture radar(SAR) plays an important role in mapping,aviation,aerospace and other fields.Compared with the pulse system SAR,FMCW SAR has the advantages of small size,low cost and high resolution.FMCW SAR using millimeter wave system can image the close-range target with high resolution.In SAR imaging processing,the traditional "stop-go-stop" hypothesis is often used for spaceborne or airborne platforms,while FMCW SAR in millimeter wave frequency band has a larger proportion of fast time in azimuth-oriented pulse repetition period.When sending and receiving signals,the relative motion between the radar platform and the target cannot be ignored,and it cannot be assumed as a "stop-go-stop" model.Therefore,this paper studies the classical range-Doppler(RD) algorithm in SAR under the non-stop-and-go assumption,and verifies the effectiveness of RD algorithm under this continuous motion model through point target simulation and slide-track SAR measurement.更多还原