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A Phase Unwrapping Method of Mass Graph Based on Heap Sort

A phase unwrapping and quality map technology, which is applied in the field of InSAR image processing, can solve problems such as slow calculation speed, error propagation, global error of the least square method, etc., and achieve the effect of improving accuracy and shortening the required time

Inactive Publication Date: 2017-07-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The branch cut method is fast to unwrap, but the improper setting of "branch cut line" will cause error propagation
The least squares method is prone to global errors, and the calculation speed is slow
The problem of phase inconsistency due to noise and undersampling has always been the difficulty of phase unwrapping.

Method used

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  • A Phase Unwrapping Method of Mass Graph Based on Heap Sort
  • A Phase Unwrapping Method of Mass Graph Based on Heap Sort
  • A Phase Unwrapping Method of Mass Graph Based on Heap Sort

Examples

Experimental program
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Embodiment

[0053] figure 1 It is a flow chart of the mass map phase unwrapping method based on heap sorting in the present invention.

[0054] In this embodiment, as figure 1 As shown, the mass map phase unwrapping method based on heap sorting of the present invention includes the following steps:

[0055] S1. Obtain an interference image

[0056] Conjugate multiplying the two SAR images, that is, multiplying the corresponding pixels of the two SAR images respectively, to obtain an interference image;

[0057] In this embodiment, the same target area is imaged twice by the spaceborne SAR to obtain two SAR images.

[0058] S2. Perform the de-levelling effect on the interference image to obtain a coherent image;

[0059] S3, performing median filtering on the coherent image to obtain the phase image A to be unwrapped;

[0060] In this embodiment, in the Bam area of ​​Iran (BAM), after preprocessing the ASAR data map with a size of 2823×1973, that is, through the processing of steps S1...

example

[0122] Generally speaking, the present invention needs to perform a series of processing according to two pieces of SAR data whose terrain does not change. Since the two SAR images obtained in the Bam region of Iran are before and after the earthquake, the unwrapping results cannot be compared with the actual terrain. To this end, it is necessary to find more suitable on-board data.

[0123] Figure 11 A screenshot of two SAR images of Phoenix, Arizona;

[0124] Figure 12 Yes Figure 11 The interferogram obtained after conjugate multiplication of the SAR image shown;

[0125] Figure 13 Yes Figure 12 The interferogram shown is a processed mass map;

[0126] Figure 14 Yes Figure 13 The resulting mass map after phase unwrapping is shown;

[0127] Figure 15 is an elevation map of the Phoenix, Arizona area.

[0128] In this embodiment, as Figure 11 As shown, two RADARSAT-2 images in this area were acquired on May 4, 2008 and May 28, 2008, respectively, with an i...

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Abstract

The invention discloses a method for phase unwrapping of a quality map based on heap sorting. First, the phase image to be unwrapped is obtained by removing the flat-ground effect and filtering, and then the phase quality map is extracted from the phase image to be unwrapped, and the heap sorting method is used to unwrap the phase image. The phase quality map is sorted, that is, it is determined that the unwrapping points in the phase image to be unwrapped are smooth, and finally, the unwrapped points are unwrapped according to the unwrapping sequence until the entire phase image to be unwrapped is unwrapped. The present invention utilizes the quality information of the phase image to be unwrapped to guide the points to be unwrapped to carry out integral unwrapping, and at the same time adds the heap sorting method to sort the phase quality map, thereby shortening the time required for phase unwrapping, and finally achieving fast and high-precision The phase unwrapping is completed and the phase unwrapped image is generated.

Description

technical field [0001] The invention belongs to the technical field of InSAR image processing, and more particularly relates to a mass map phase unwrapping method based on heap sorting. Background technique [0002] InSAR (interferometric Synthetic Aperture Radar, interferometric synthetic aperture radar) technology was originally developed for the purpose of terrain mapping, the most successful application is to obtain high-precision DEM (Digital Elevation Model, digital elevation model) data. With the development of technology, the application fields of InSAR are constantly expanding, mainly including: surface deformation detection, moving target detection, ocean mapping, forest mapping, flood monitoring, traffic monitoring, and glacier research. The spaceborne InSAR system is a large system involving a wide range of fields, multiple layers and high complexity, and its corresponding processing links are also relatively complex. The main steps of data processing in the spa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 陈彦王世钦童玲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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