CAJ | 학술논문

针对双站合成孔径雷达(SAR)中由于发射机、接收机斜视角和速度的不同导致获取图像存在几何失真的问题,提出了一种基于坐标尺度变换的双站SAR图像几何失真校正方法.首先根据双站SAR的几何关系,详细分析了目标的斜距历程.采用等效相位中心原理,将双站SAR模型等效于单站SAR模型,结合RD成像算法,建立了几何失真校正的数学模型.最后通过该数学模型,对静止二维点阵目标的成像结果进行了几何失真校正,校正结果与地面设定的场景完全一致,从而验证了该校正方法的有效性和正确性.
침대쌍참합성공경뢰체(SAR)중유우발사궤、접수궤사시각화속도적불동도치획취도상존재궤하실진적문제,제출료일충기우좌표척도변환적쌍참SAR도상궤하실진교정방법.수선근거쌍참SAR적궤하관계,상세분석료목표적사거역정.채용등효상위중심원리,장쌍참SAR모형등효우단참SAR모형,결합RD성상산법,건립료궤하실진교정적수학모형.최후통과해수학모형,대정지이유점진목표적성상결과진행료궤하실진교정,교정결과여지면설정적장경완전일치,종이험증료해교정방법적유효성화정학성.
The existence of the differences in squint angle and velocity between transmitter and receiver in the bistatic synthetic aperture radar(SAR)makes the imaging results distorted.This paper concerns the issue of bistatic SAR image geometric correction.According to the geometry of the bistatic SAR,the slant range history is particularly analyzed.In addition,the equivalent phase center (EPC) method is used to transform the bistatic model to a monostatic equivalent.Then,the expression of the geometric distortion correction for the bistatic SAR image is derived based on the RD imaging algorithm.Finally,the validity of the method is demonstrated by simulation.