信号处理
信號處理
신호처리
SIGNAL PROCESSING
2015年
8期
962-967
,共6页
邢涛%胡庆荣%李军%王冠勇
邢濤%鬍慶榮%李軍%王冠勇
형도%호경영%리군%왕관용
合成孔径雷达%距离走动校正%距离空变
閤成孔徑雷達%距離走動校正%距離空變
합성공경뢰체%거리주동교정%거리공변
synthetic aperture radar(SAR)%range walk correction%range dependence
斜视角的距离空变导致距离走动校正存在距离空变。文中分析了距离走动校正距离空变对成像的影响,发现距离走动校正空变导致目标图像在近距端和远距端向反方向漂移。在前斜视SAR中,距离场景近端目标向左漂移若干像素,距离场景远端目标向右漂移若干像素。距离走动校正空变不仅造成场景的扭曲,在高分辨大斜视下还会使图像散焦。文中给出了距离走动校正距离空变补偿方法,所提方法可与常规的二次补偿结合进行,不会增加额外的计算负担。仿真结果与理论分析一致,距离走动校正空变补偿后,场景近端和远端目标均能较好聚焦,实测数据成像实验也与理论分析相符。从而表明距离走动校正空变分析是正确的,距离走动校正空变补偿方法是有效的。
斜視角的距離空變導緻距離走動校正存在距離空變。文中分析瞭距離走動校正距離空變對成像的影響,髮現距離走動校正空變導緻目標圖像在近距耑和遠距耑嚮反方嚮漂移。在前斜視SAR中,距離場景近耑目標嚮左漂移若榦像素,距離場景遠耑目標嚮右漂移若榦像素。距離走動校正空變不僅造成場景的扭麯,在高分辨大斜視下還會使圖像散焦。文中給齣瞭距離走動校正距離空變補償方法,所提方法可與常規的二次補償結閤進行,不會增加額外的計算負擔。倣真結果與理論分析一緻,距離走動校正空變補償後,場景近耑和遠耑目標均能較好聚焦,實測數據成像實驗也與理論分析相符。從而錶明距離走動校正空變分析是正確的,距離走動校正空變補償方法是有效的。
사시각적거리공변도치거리주동교정존재거리공변。문중분석료거리주동교정거리공변대성상적영향,발현거리주동교정공변도치목표도상재근거단화원거단향반방향표이。재전사시SAR중,거리장경근단목표향좌표이약간상소,거리장경원단목표향우표이약간상소。거리주동교정공변불부조성장경적뉴곡,재고분변대사시하환회사도상산초。문중급출료거리주동교정거리공변보상방법,소제방법가여상규적이차보상결합진행,불회증가액외적계산부담。방진결과여이론분석일치,거리주동교정공변보상후,장경근단화원단목표균능교호취초,실측수거성상실험야여이론분석상부。종이표명거리주동교정공변분석시정학적,거리주동교정공변보상방법시유효적。
Range-dependent squint angle cause range-dependent range walk correction.This paper analyzes the impact of range-dependent range walk correction to imaging,and found that range-dependent range walk correction causes the target image shift to the opposite direction at the near and far end.In forward squint-looking mode SAR imaging the near end tar-gets in range scene shift certain pixels to the left while the far end targets in range scene shift certain pixels to the right. Range-dependent range walk correction not only results in distortion of the scene,but also cause the image defocusing at high resolution high squint SAR system.This paper presents a compensation method for range-dependent range walk correc-tion.The proposed method operates with the second motion compensation and do not increase computation burden.Simula-tion results are similar to theoretical analysis,after compensation with range-dependent range walk correction,targets in near and far end of scene can focus well,the real data imaging experiments are also consistent with theoretical analysis. Thus indicating range-dependent range walk correction analysis is correct,and range-dependent range walk correction com-pensation method is effective.