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Quality map phase unwrapping method based on heap sort

A phase unwrapping and mass map technology, applied in the field of InSAR image processing, can solve the problems of slow calculation speed, error propagation, global error of least square method, etc., to improve the accuracy and shorten the required time.

Inactive Publication Date: 2015-07-08
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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  • Quality map phase unwrapping method based on heap sort
  • Quality map phase unwrapping method based on heap sort
  • Quality map phase unwrapping method based on heap sort

Examples

Experimental program
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Embodiment

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

[0054] In this example, if figure 1 As shown, the present invention is based on the quality map phase unwrapping method of heap sorting, comprising the following steps:

[0055] S1. Obtain the interference image

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

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

[0058] S2. Performing a flattening effect on the interference image to obtain a coherent image;

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

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

example

[0122] Generally speaking, the present invention needs to perform a series of processing based on two pieces of SAR data whose terrain has not changed. However, since the two SAR images acquired in the Bam region of Iran were taken before and after the earthquake, the unwrapped results cannot be compared with the actual terrain. For this reason, it is necessary to find more suitable spaceborne data.

[0123] Figure 11 are screenshots 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 quality map obtained by processing the interferogram shown;

[0126] Figure 14 yes Figure 13 The resulting plot of the mass map shown after phase unwrapping;

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

[0128] In this example, if Figure 11 As shown, the two RADARSAT-2 images of this area were acquired on May 4, 2...

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Abstract

The invention discloses a quality map phase unwrapping method based on heap sort. Firstly, a phase image to be unwrapped is obtained through flat-earth phase removal and filtering; then, phase quality maps are extracted from the phase image to be unwrapped and sorted through the heap sort method, so that the unwrapping sequence of points to be unwrapped in the phase image to be unwrapped is determined; finally, according to the unwrapping sequence, the points to be unwrapped are unwrapped till the whole phase image to be unwrapped is unwrapped. Quality information of the phase image to be unwrapped is utilized to guide integral unwrapping of the points to be unwrapped, and meanwhile the heap sort method is adopted to sort the phase quality maps, so that time needed for phase unwrapping is shortened, finally, phase unwrapping is rapidly completed with high precision, and a phase-unwrapped image is generated.

Description

technical field [0001] The invention belongs to the technical field of InSAR image processing, and more specifically relates to a method for phase unwrapping of mass maps based on heap sorting. Background technique [0002] InSAR (interferometric Synthetic Aperture Radar, Interferometric Synthetic Aperture Radar) technology was originally developed for terrain mapping, and 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, oceanographic 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(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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