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SAR interferometric phase unwrapping reference point selecting method and device, and storage medium

A technology of interferometric phase and phase unwrapping, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., to achieve the effect of improving accuracy, guiding phase unwrapping, and overall control

Active Publication Date: 2018-12-14
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: Aiming at the problem of how to determine a reliable unwrapping reference point to ensure the accuracy of phase unwrapping, provide a SAR interferometric phase unwrapping reference point selection method, equipment and storage medium

Method used

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  • SAR interferometric phase unwrapping reference point selecting method and device, and storage medium
  • SAR interferometric phase unwrapping reference point selecting method and device, and storage medium
  • SAR interferometric phase unwrapping reference point selecting method and device, and storage medium

Examples

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Embodiment 1

[0058] Step S101, generating an interferogram to be unwrapped:

[0059] In this example, the research area is Jiuzhaigou County, Sichuan Province. Select two SAR images covering the study area on September 28, 2017 and October 10, 2017, with an image size of 24642*6874. After image registration, interference processing, flat ground removal, and phase filtering operations, the interferogram A to be unwrapped is obtained, as shown in figure 2 shown. In the process of processing, multi-view processing is performed on the image, and the number of views in the distance direction and the azimuth direction are 10 and 2 respectively;

[0060] Step S102. Calculate the coherence of the interferogram to be unwrapped to obtain the coherence diagram B, such as image 3 shown;

[0061] Step S103, removing low-coherence points:

[0062] In this embodiment, most of the research area is mountainous and complex terrain, and the coherence threshold Φ is set to 0.5 to eliminate points whose...

Embodiment 2

[0070] On the basis of the first embodiment, it also includes: step S108, phase unwrapping;

[0071] The unwrapping reference point is selected based on the selection method of the unwrapping reference point in the first embodiment above, and then the phase unwrapping is performed using a traditional phase unwrapping method (for example, the minimum cost maximum flow method).

[0072] For example: using point P as the unwrapping reference point, the phase unwrapping diagram is obtained, such as Figure 4 shown. As a comparison, this embodiment sets up two control groups. The first control group selects the starting point of the image as the unwrapping reference point, uses the same unwrapping method to unwrap, and obtains the phase unwrapping diagram, as shown in Figure 5 shown. The second control group manually selects a reference point as the unwrapping reference point, uses the same unwrapping method to unwrap, and obtains the phase unwrapping diagram, as shown in Ima...

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Abstract

The invention relates to the technical field of mapping science or synthetic aperture radar interferometry. The invention provides a SAR interferometric phase unwrapping reference point selecting method and device, and a storage medium for the problem of how to determine a reliable unwrapping reference point to ensure the phase unwrapping accuracy, wherein the coherence of an interferogram A to beunwrapped is calculated, and a coherent map B of the same size as the interferogram A is obtained; in the coherent map B, the sub-region C of the coherent map B is selected with the image center of the coherent map B as the reference; an interference point corresponding to the maximum value of the coherence is obtained from the sub-region C of the coherent map B; a corresponding reference point Pof the reference point of the sub-region C in the interferogram A is calculated, and the reference point P is an unwrapping reference point.

Description

technical field [0001] The invention relates to the field of surveying and mapping science or synthetic aperture radar interferometry technology, in particular to a method, device and storage medium for selecting a reference point for SAR interferometric phase unwrapping. Background technique [0002] Synthetic Aperture Radar Interferometry (SAR, Synthetic Aperture Radar) is an active earth observation technology, which has the advantages of high spatial resolution and wide coverage. It can observe the earth all day and all weather, and can penetrate clouds. Fog can effectively make up for the lack of optical satellite measurements. In recent years, radar interferometry technologies such as interferometry (InSAR), differential interferometry (DInSAR), and time-series interferometry have been formed by combining SAR imaging principles and interferometry techniques, which are widely used in topographic mapping, surface deformation monitoring, and DEM acquisition. . [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 罗京辉杨志高郑长利成志强王涌李学仕王晓霞
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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