Satellite-borne InSAR atmospheric correction method combined with GACOS
An atmospheric correction and space-borne technology, which is applied in the directions of radio wave reflection/re-radiation, re-radiation, and measurement devices, can solve the problems of lack of regularity in the performance of atmospheric errors in InSAR images, and achieve wide application range, good effect, The effect of saving resources
Pending Publication Date: 2022-04-29
CHANGAN UNIV
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The generation of InSAR images requires interference processing of two SAR images in different periods, and the spatial distribution of the atmosphere at two different times is very different, resulting in the lack of regularity in the performance of atmospheric errors in InSAR images, which is difficult to deal with by simple methods
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[0023] A number of specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0024] Specifically, such as Figure 1-3 As shown, the present invention is based on a small baseline set InSAR, uses a general-purpose atmospheric correction model and principal component analysis method, and aims to use a simple and easy-to-operate method to obtain InSAR images with better correction effects.
[0025] Firstly, the original satellite SAR image, as well as the satellite orbit data and terrain data corresponding to the original SAR image are obtained, the original SAR image is co-registered to the common main image, and the interferometric processing is performed to obtain the interferometric interferometric image.
[0026] During the generation of interferometric images, the orbit data is used ...
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The invention discloses a satellite-borne InSAR atmospheric correction method combined with GACOS, and the method comprises the steps: firstly obtaining an original satellite SAR image, carrying out the co-registration of the original satellite SAR image to a common main image, carrying out the interference processing, obtaining a winding interference image, and finally obtaining an unwound original interference image; then atmospheric correction data of all the images are generated by using a GACOS online service, and initial atmospheric correction is carried out on all the original interference images; recombining all the original interference images subjected to initial atmospheric correction into a plurality of subsets according to SAR images; then, principal component analysis processing is carried out on each subset, principal component components reaching a threshold value in each subset are removed, and then the subsets are restored into interference images; and finally, inputting the reduced interference image into a small baseline set InSAR to carry out time sequence analysis so as to generate an accumulated deformation quantity, a deformation rate and a topographic error. The method is easy to operate, good in effect, capable of saving resources and wide in application range, and does not limit use of a platform.
Description
technical field [0001] The invention relates to the technical field of radar measurement, in particular to a spaceborne InSAR atmospheric correction method combined with GACOS. Background technique [0002] Synthetic aperture radar interferometry (InSAR) is an advanced geodetic tool, which has the characteristics of strong all-weather and all-weather working ability, wide spatial coverage, high spatial resolution, high measurement accuracy, and no need for ground instruments. Applied to the measurement of surface deformation with high spatial resolution. [0003] Synthetic aperture radar interferometry technology relies on the SAR images generated by active microwave remote sensing satellites. The satellite signals emitted by SAR satellites start from the satellites, pass through the atmosphere and reach the ground, and then are reflected by the surface and pass through the atmosphere before being received by the satellite. In the troposphere, the propagation speed of elect...
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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/90
Inventor 李振洪张雪松
Owner CHANGAN UNIV