Insal-Based Region Filtering Quality-Guided Phase Unwrapping Method

A phase unwrapping and area filtering technology, which is applied in the field of phase unwrapping, can solve problems such as uneven distribution of error areas, poor unwrapping results, and reduced accuracy of target elevation reconstruction steps, achieving the effect of reduced noise amplitude and smooth phase changes

Inactive Publication Date: 2019-08-02
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the unwrapping result of the existing phase unwrapping method is poor, there will be obvious error areas and unevenly distributed error points, which reduces the accuracy of the next step of target elevation reconstruction, thereby providing a solution based on InSAL's region-filtering mass-guided phase unwrapping method

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  • Insal-Based Region Filtering Quality-Guided Phase Unwrapping Method

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specific Embodiment approach 1

[0020] Specific implementation mode 1: Combination figure 1 To specifically describe this embodiment, the InSAL-based regional filtering quality guided phase unwrapping method described in this embodiment includes the following steps:

[0021] Step 1: Determine the pixel point with the highest phase quality of the overall interference phase map, and perform phase unwrapping on this point;

[0022] Step 2. Starting from the pixel point with the highest phase quality, detect four pixel points adjacent to the point, unwrap the four pixel points, and unwrap the phase of each pixel point. The adjacent unwrapped pixel points are stored in adjacent columns;

[0023] Adjacent means adjacent in azimuth or distance;

[0024] Step 3: Select the pixel point with the highest phase quality from the adjacent column, perform phase unwrapping on the pixel point, and store the adjacent ununwrapped pixel points of the pixel point in the adjacent column. Update the adjacent column;

[0025] Repeat step...

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Abstract

A regional filtering quality guided phase unwrapping method based on InSAL relates to a phase unwrapping technology, and is provided to solve the problem that the existing phase unwrapping method is poor in unwrapping result. The method comprises the following steps: determining a pixel of the highest quality in an overall interferometric phase image, and carrying out phase unwrapping; detecting four pixels adjacent to the pixel of the highest quality, unwrapping the pixels, and storing wrapped pixels adjacent to each unwrapped pixel in an adjacent column; selecting a pixel of the highest quality from the adjacent column, carrying out phase unwrapping, storing wrapped pixels adjacent to the pixel in the adjacent column, and updating the adjacent column; repeating the steps until the phases of all the pixels are unwrapped and a primary unwrapping map is obtained; determining error points of the primary unwrapping graph, getting a pixel error flag matrix, and getting a pixel error flag matrix expander graph; and carrying out regional filtering on the primary unwrapping graph. The method of the invention is suitable for phase unwrapping.

Description

Technical field [0001] The present invention relates to phase unwrapping technology. Background technique [0002] In the current InSAL (Interferometric Synthetic Aperture Lidar) imaging process, phase unwrapping is required. For the InSAL system, the phase unwrapping is generally implemented by the InSAR (Synthetic Aperture Radar Interferometry) method, but due to the different signal sources of the system The source of system noise is different. Under the influence of InSAL thermal noise and shot noise, the unwrapping result of InSAR's phase unwrapping method is poor. Obvious error areas and unevenly distributed error points will appear, which will affect The accuracy of the next step of target elevation reconstruction is determined. Summary of the invention [0003] The purpose of the present invention is to solve the problem of poor unwrapping results of the existing phase unwrapping methods, obvious error regions and unevenly distributed error points, and reducing the accura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/89
CPCG01S17/90
Inventor 张勇邱鹏宇赵远
Owner HARBIN INST OF TECH
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