In-orbit application parameters test and analysis of L-band differential interferometric SAR satellite constellation

doi:10.11947/j.AGCS.2024.20230240.

Abstract

Abstract:

After one year in-orbit test of the China's first L-Band differential interferometric SAR (L-SAR) satellite, which is also named as LuTan-1, we finally conclude that the satellite has reached the pre-defined accuracies. In this paper, we analyzed the key technologies that related to the parameters of the quantitative applications. Three kinds of parameters belonging the long-time geolocation capacity, the digital surface model (DSM) accuracy, as well as the deformation products accuracy are introduced. Results show that the geolocation error of L-SAR is within 3.9 m. We obtained the DSM calibration and validation data in Henan and Jiangsu Provinces. DSM accuracies before interferometric calibration, after calibration and after least square estimation are 13.2, 6.3 and 2.9 m, respectively. We have defined three kinds of deformation products, i. e., deformation products generated using differential InSAR, stacking and multi-temporal InSAR. Accuracies of the three deformation products obtained in Datong of Shanxi Province are 2.7 mm, 8.6 mm/a and 3.7 mm, respectively. Meanwhile, 90% of the strict regression orbit radius was tested to be smaller than 323 m. The components of the decoherence sources were discussed. Final coherence before filtering is better than 0.7 when ignoring the temporal decoherence. The in-orbit test result is encouraging and the satellite will be widely used after its delivery from satellite producers to the users.

Key words: L-SAR, LuTan-1, in-orbit test, geometric accuracy, digital surface model accuracy, deformation accuracy

CLC Number:

P236

Xinming TANG, Tao LI, Xiang ZHANG, Xiaoqing ZHOU, Jing LU, Xuefei ZHANG. In-orbit application parameters test and analysis of L-band differential interferometric SAR satellite constellation[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(10): 1863-1872.

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时间	区域	方位向残差	距离向残差	平面定位残差
2022-07-12	江苏省	2.80	2.59	3.81
2022-07-12	河南省	0.74	0.64	0.98
2022-08-29	江苏省	0.65	0.53	0.84
2022-08-29	河南省	0.57	0.33	0.66
2023-01-24	内蒙古自治区	3.23	1.02	3.39
2023-03-08	内蒙古自治区	0.59	0.76	0.96
2023-04-12	内蒙古自治区	3.23	0.36	3.25
2023-04-16	内蒙古自治区	2.27	1.95	2.99
2023-04-18	内蒙古自治区	1.15	2.57	2.82

成像时间	影像ID	检校前/m	检校后/m	平差后/m	影像类型
7月12日	28089	12.9	1.8	0.9	检校景
	28090	13.2	1.7	1.0	验证景
	28091	7.7	6.3	2.9	验证景
	28092	9.6	3.3	1.7	验证景
8月29日	33399	3.1	0.9	0.9	检校景
	33400	3.2	1.0	1.0	验证景
	33401	5.3	2.7	1.9	验证景
	33403	6.0	3.8	1.0	验证景

测试项	GPS		BD-2		BD-3
测试项	A星	B星	A星	B星	A星	B星
定位精度/mm	2.5	2.0	19.8	18.2	17.6	15.7
测速精度/μm	2.9	1.9	11.8	9.8	10.4	8.5

卫星名称	回归轨道控制半径/m
Seasat	—
ERS	—
Radarsat-1	5000
SRTM	—
ENVISAT	—
ALOS-PALSAR	500
TerraSAR-X/TanDEM-X	250
ALOS-2	500
Radarsat-2	5000
Cosmo-Skymed	—
Sentinel-1	50
高分三号	—
L-SAR	350

相干性	关键参数	典型值	说明
基线相干性	回归轨道控制半径	0.99	条带模式1
体散射相干性	模糊高、树高	0.86	模糊高35 m
信噪比相干性	等效噪声后向散射系数	0.97	-31 dB
模糊相干性	方位向与距离向模糊	0.98	方位向模糊-20 dB，距离向模糊-27 dB
量化相干性	量化比	0.94	支持的量化比包括10∶10、10∶6、10∶4、10∶3、10∶2
多普勒相干性	方位向带宽	0.99	条带模式13 200 Hz
处理相干性	配准、过采样	0.96	配准精度0.1像素，16点sinc函数插值
时间相干性	时间基线	1.00	暂不予考虑。
总体相干性	0.72