CAJ | 학술논문

导弹的俯冲加速运动所带来的较大距离徙动使得SAR成像难度较大.该文根据弹载SAR平台的运动特点,使用高阶逼近模型建立了SAR的回波信号模型.考虑到大场景下的距离空变问题,对目标斜距随时间的变化进行了详细的分析.结合级数反演法,得到了弹载SAR回波信号的2维频域的精确表达式.基于此式,提出了一种适用于弹载SAR俯冲加速运动下的大场景成像算法.理论分析和实验结果表明,该算法对较大场景取得了较好的成像效果,距离向和方位向分辨率都达到了理论分辨率.
도탄적부충가속운동소대래적교대거리사동사득SAR성상난도교대.해문근거탄재SAR평태적운동특점,사용고계핍근모형건립료SAR적회파신호모형.고필도대장경하적거리공변문제,대목표사거수시간적변화진행료상세적분석.결합급수반연법,득도료탄재SAR회파신호적2유빈역적정학표체식.기우차식,제출료일충괄용우탄재SAR부충가속운동하적대장경성상산법.이론분석화실험결과표명,해산법대교대장경취득료교호적성상효과,거리향화방위향분변솔도체도료이론분변솔.
The large range migration produced by missile diving acceleration flight make SAR image difficult. This paper establishes the echo model of the missile-borne SAR by using the high order range model based on the characters of the missile movements. Considering the large scene, the change of the slant range is analyzed in details. Then, the two-dimensional point target spectrum is derived by the method of series reversion. A large scene imaging algorithm used for diving acceleration flight is presented. Finally, simulation results are presented to demonstrate the accuracy and validity of the proposed algorithms. The resolution of range and azimuth are identical with the theoretical values.