CAJ | 학술논문

近年来,一般构形双基SAR由于其灵活性等特点,成为SAR的重要研究方向之一,一种典型的一般构形系统就是星一机混合双基SAR.一般空间构形双基SAR由于其具有二维空变性,给成像处理造成困难.针对这一问题,本文分析了基于级数反演法求得的一般构形双基SAR回波二维频率域表达式及其二维空变特性,将此二维频域表达式的相位线性化为目标距离参数和方位位置参数的函数,然后采用两次逆chirp-z处理来解决距离和方位空变问题,由此建立了一般构形双基SAR的chirp-z成像方法.最后通过星-机构形下的仿真验证了此成像方法的有效性.
근년래,일반구형쌍기SAR유우기령활성등특점,성위SAR적중요연구방향지일,일충전형적일반구형계통취시성일궤혼합쌍기SAR.일반공간구형쌍기SAR유우기구유이유공변성,급성상처리조성곤난.침대저일문제,본문분석료기우급수반연법구득적일반구형쌍기SAR회파이유빈솔역표체식급기이유공변특성,장차이유빈역표체식적상위선성화위목표거리삼수화방위위치삼수적함수,연후채용량차역chirp-z처리래해결거리화방위공변문제,유차건립료일반구형쌍기SAR적chirp-z성상방법.최후통과성-궤구형하적방진험증료차성상방법적유효성.
In last years the interest in general bistatic SAR is increasing and a typical configuration is the space-home/air-borne hybrid bistatic SAR.Because ofthe two dimensional variance ofgeneral bistatic SAR.it is dittlcuh to focus the echo.In the paper,the spectrum based on series reversion and its two dimensional variance is analyzed,then the chirp-z algorithm is presented to focus the general bistatic sAR echo.The algorithm comprises the two steps of inverse chirp-z transform,with which the range and azimuth variance is processed.Lasdy effectivity of the algorithm is confirmed by simulation of hybrid configuration.