CAJ | 학술논문

合成孔径雷达系统通常要对回波进行数字处理,方位向、距离向采样会给SAR点目标响应的峰值带来测量误差.该文针对此问题进行了深入分析,给出了峰值测量误差与点目标位置的关系.对时分工作方式多极化SAR系统的分析结果表明,在某些情况下,由方位向采样和非同时测量造成的极化数据间相对幅度和相位误差会很大.该文提出了使不同极化回波的匹配滤波函数相隔一定延时的匹配滤波方法,以使方位向采样对各极化数据具有相同的影响.仿真结果表明该方法有效地改善了极化数据间幅相一致性.该文研究的问题对SAR的精确定标有着重要意义.
합성공경뢰체계통통상요대회파진행수자처리,방위향、거리향채양회급SAR점목표향응적봉치대래측량오차.해문침대차문제진행료심입분석,급출료봉치측량오차여점목표위치적관계.대시분공작방식다겁화SAR계통적분석결과표명,재모사정황하,유방위향채양화비동시측량조성적겁화수거간상대폭도화상위오차회흔대.해문제출료사불동겁화회파적필배려파함수상격일정연시적필배려파방법,이사방위향채양대각겁화수거구유상동적영향.방진결과표명해방법유효지개선료겁화수거간폭상일치성.해문연구적문제대SAR적정학정표유착중요의의.
Analog SAR echoes are usually sampled in both azimuth and range for digital processing, which will introduce error to point target peak measurements. This problem is analyzed in detail and the theoretical relationship between peak error and target location is given. For time-divided mode polarimetric SAR systems, azimuth sampling will also introduce relative error between different polarization data. A match-filtering method is proposed, which uses different time-delayed filtering functions for different polarization data, to produce the same effect of azimuth sampling on them. Simulation results prove its effectiveness in improving the magnitude and phase consistency.