A method of stereo localization for airborne SAR image based on range equations is proposed. This method uses three SAR images of the same imaging area to implement stereo localization without control points. Firstly, the corresponding image points (CIP) in the three images are determined, and the platform parameters corresponding to the CIP such as instantaneous geographic coordinates, altitude, and slant range are analyzed. The range equations for the CIP of three images are established in the geocentric coordinate system. The geocentric coordinates of the CIP are obtained by solving range equations, the geographic coordinates and altitude are obtained by coordinate transformation, so as to realize the three-dimensional positioning. The system error factors affecting the accuracy of stereo localization are simulated and analyzed. The positioning experiment is carried out using the actual flight airborne SAR image. The results show that the proposed method is effective.
PAN Zhigang
,
WANG Chao
,
CAO Ge
. Stereo localization method for air-borne SAR image based on range equations[J]. Journal of University of Chinese Academy of Sciences, 2020
, 37(6)
: 798
-804
.
DOI: 10.7523/j.issn.2095-6134.2020.06.011
[1] 潘志刚,潘卓,曹舸. 机载SAR无控制点直接定位方法[J]. 中国科学院大学学报,2015, 32(4):536-541.
[2] Curlander J C. Location of pixels in space-borne SAR imagery[J]. IEEE Transactions on Geosciences and Remote Sensing, 1982, 20(3):359-364.
[3] Johnsen H, Lauknes L,Guneriussen T.Geocoding of fast-delivery ERS-1 SAR image mode product using DEM data[J].International Journal of Remote Sensing, 1995, 16(11):1957-1968.
[4] Leberl F W. Radargrammetric image processing[M]. Massachusetts:Artech House, 1990.
[5] 张红敏. SAR图像高精度定位技术研究[D]. 郑州:信息工程大学, 2013.
[6] 张红敏, 靳国旺, 徐青,等. 利用单个地面控制点的SAR图像高精度立体定位[J]. 雷达学报,2014, 3(1):85-91.
[7] 韦北余,朱岱寅,吴迪,等. 一种基于和差波束的机载SAR定位方法[J]. 电子与信息学报,2013,35(6):1464-1470.
[8] 程春泉,张继贤,黄国满,等. 考虑多普勒参数的SAR影像距离-共面方程及其定位[J]. 遥感学报, 2013, 17(6):1444-1450.
[9] Schubert A, Small D, Jehle M. COSMO-Skymed, TerraSAR-X, and RADARSAT-2 geolocation accuracy after compensation for earth-system effects[C]//2012 IEEE International Geoscience and Remote Sensing Symposium (IGARSS2012), Germany, 2012:3301-3304.
[10] Gisinger C, Balss U, Pail R, et al. Precise three-dimensional stereo localization of corner reflectors and persistent scatters with TerraSAR-X[J]. IEEE Transactions on Geosciences and Remote Sensing, 2015, 53(4):1782-1802.
[11] Eineder M, Minet C, Steigenberger P, et al. Imaging geodesy:toward centimeter-level ranging accuracy with TerraSAR-X[J]. IEEE Transactions on Geosciences and Remote Sensing, 2011, 49(2):661-671.
[12] Cong X Y, Balss U, Eineder M. Imaging geodesy:centimeter-level ranging accuracy with TerraSAR-X:an update[J]. IEEE Geoscience and Remote Sensing Letters, 2012, 9(5):948-952.
[13] 云菲. 高分三号卫星[J]. 卫星应用, 2016(8):F0004.
[14] 丁赤飚,刘佳音,雷斌,等. 高分三号SAR卫星系统级几何定位精度处探[J]. 雷达学报,2017,6(1):11-16.
