Research on Key Technologies of Precise InSAR Surveying and Mapping Applications Using Automatic SAR Imaging

doi:10.11947/j.JGGS.2019.0204

Abstract

Abstract:

Precise interferometric synthetic aperture radar (InSAR) is a new intelligent photogrammetric technology that uses automatic imaging and processing means. Precise InSAR has become the most efficient satellite surveying and mapping (SASM) method that uses the interferometric phase to create a global digital elevation model (DEM) with high precision. In this paper, we propose the application of systematic InSAR technologies to SASM. Three key technologies are proposed: calibration technology, data processing technology and post-processing technology. First, we need to calibrate the geometric and interferometric parameters including the azimuth time delay, range time delay, and atmospheric delay, as well as baseline errors. Second, we use the calibrated parameters to create a precise DEM. One of the important procedures in data processing is the determination of phase ambiguities. Finally, we improve the DEM quality through the joint use of the block adjustment method, long and short baseline combination method and descending and ascending data merge method. We use 6 sets of TanDEM-X data covering Shanxi to conduct the experiment. The root mean square error of the final DEM is 5.07m in the mountainous regions. In addition, the low coherence area is 0.8km ². The result meets the China domestic SASM accuracy standard at both the 1∶50000 and 1∶25000 measurement scales.

Key words: InSAR; global mapping; calibration; post-processing; DEM

Xinming TANG,Tao LI,Xiaoming GAO,Qianfu CHEN,Xiang ZHANG. Research on Key Technologies of Precise InSAR Surveying and Mapping Applications Using Automatic SAR Imaging[J]. Journal of Geodesy and Geoinformation Science, 2019, 2(2): 27-37.

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Source	Year Released	Coverage	Grid Size	Height Accuracy/m	Technology
GTOPO30	1993	90°S—90°N	30″/~900m	30	Merged using 8 data sources
SRTM-C-v1	2003	56°S—60°N	3″/~90m	16	InSAR
ETOPO1	2008	90°S—90°N	1'	None	Merged using 12 data sources
GMTED2010	2010	90°S—84°N	7.5″, 15″, and 30″	10	Merged using 11 data sources
ASTER GDEM-v2	2011	80°S—80°N	15m	15	Optical photogrammetry
ALOS DSM	2015	82°S—82°N	1″/~30m	5	Optical photogrammetry
TanDEM-X DEM	2016	90°S—90°N	0.4″/~12m	4	InSAR

Image Index	Descending/ Ascending	Perpendicular Baseline/m	HoA/m
20140402_1	Ascending	-129.40	79.06
20121021_2	Ascending	-370.75	27.33
20130903_3	Descending	215.16	57.15
20130925_4	Descending	204.52	56.29
20130903_5	Descending	214.96	57.22
20130925_6	Descending	204.33	56.36

Image Index	SRTM	ICESat-GLAS	Ziyuan-3 GCPD
20140402_1	3.12	5.96	1.28
20121021_2	2.42	4.75	3.44
20130903_3	1.39	4.72	3.75
20130925_4	0.98	3.14	0.74
20130903_5	1.03	1.67	1.80
20130925_6	0.65	1.95	1.36

Image Index	a(×10^-4)	b(×10^-4)	c(×10^-4)
20130903_3	5.30	-2.13	-7.30
20130925_4	-6.24	-2.38	3.02
20130903_5	4.35	-3.04	-5.55
20130925_6	-8.96	-3.43	0.00