CAJ | 학술논문

机载顺轨干涉合成孔径雷达(ATI-SAR)估计运动目标径向速度的精度受干涉相位误差、基线分量误差等影响，因此为了得到较高的测速精度必须对ATI-SAR的系统参数进行定标处理。基于敏感度方程的定标方法是干涉SAR 定标中的常用方法，但是其性能受敏感度矩阵条件数的影响，地面控制点(GCP)或角反射器的布设方式决定了敏感度矩阵的条件数大小。该文通过分析给出机载ATI-SAR系统定标中GCP的布设策略，包括静止GCP的布设方式及运动GCP的数量、布设位置、运动速度大小和方向的设置原则，并通过仿真手段对上述布设策略进行了验证。
궤재순궤간섭합성공경뢰체(ATI-SAR)고계운동목표경향속도적정도수간섭상위오차、기선분량오차등영향，인차위료득도교고적측속정도필수대ATI-SAR적계통삼수진행정표처리。기우민감도방정적정표방법시간섭SAR 정표중적상용방법，단시기성능수민감도구진조건수적영향，지면공제점(GCP)혹각반사기적포설방식결정료민감도구진적조건수대소。해문통과분석급출궤재ATI-SAR계통정표중GCP적포설책략，포괄정지GCP적포설방식급운동GCP적수량、포설위치、운동속도대소화방향적설치원칙，병통과방진수단대상술포설책략진행료험증。
The accuracy of the radial velocity estimated by the airborne Along-Track Interferometric SAR (ATI-SAR) is affected by the accuracy of different system parameter, such as the interferometric phase biases and the baseline components errors. Therefore, these factors must be calibrated if the higher radial velocity estimation accuracy is required. The calibration methods based on the sensitivity equations are generally used in the interferometric SAR calibration. However, the performance of these methods is limited by the matrix condition number of the sensitivity matrix, which is decided by the location strategy of Ground Control Points (GCP). This study analyses and simulates the condition number of the sensitivity matrix corresponding to the different GCP distribution ways along the swath as well as the different selections of velocities and positions of moving ground control points.