%A FAN Huaitao, ZHANG Zhimin, LI Ning, WEI Yunlong %T Target geo-location method in airborne TOPSAR mode based on IMU %0 Journal Article %D 2016 %J Acta Aeronautica et Astronautica Sinica %R 10.7527/S1000-6893.2015.0261 %P 1587-1594 %V 37 %N 5 %U {https://hkxb.buaa.edu.cn/CN/abstract/article_16225.shtml} %8 2016-05-15 %X

In the terrain observation by progressive scans synthetic aperture radar (TOPSAR) mode, the application of burst mode and beam steering in the azimuth can effectively weaken scalloping effect, which is an inherent defect in ScanSAR mode. In addition, several problems arise in TOPSAR mode, such as the complex relationship between image pixels and the corresponding echo pulses, which makes it difficult to geo-locate targets precisely. Meanwhile, time-lapse in the process of recording inertial measurement unit (IMU) data will worsen the location accuracy in azimuth and precise estimation of the error will greatly improve geo-location performance. Proceeding from the geometric relationship of data acquisition and imaging algorithm in TOPSAR mode, a new target geo-location method is proposed with the usage of airborne IMU data. The presented method can provide longitude and latitude information of targets from processed imagery. Tests have been conducted using airborne TOPSAR imagery to verify the proposed method and average geo-location accuracy of twenty-five meters can be obtained.