Tomography SAR 3D imaging method based on stagewise weak orthogonal matching pursuit

A technology of orthogonal matching tracking and three-dimensional imaging, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve the difficulty of increasing production and application, and it is difficult to accurately determine the vertical signal sparsity of slant distance, etc. problems, to achieve the effect of expanding the imaging range

Inactive Publication Date: 2017-06-20
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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Problems solved by technology

However, in practical applications, it is difficult to accurately determine the sparsity of the slant-range vertical signal, which greatly increases the difficulty of production applications

Method used

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  • Tomography SAR 3D imaging method based on stagewise weak orthogonal matching pursuit
  • Tomography SAR 3D imaging method based on stagewise weak orthogonal matching pursuit
  • Tomography SAR 3D imaging method based on stagewise weak orthogonal matching pursuit

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Effect test

Embodiment 1

[0041] figure 1 A flow chart of a tomographic SAR three-dimensional imaging method based on segmented weak orthogonal matching pursuit is shown, including the following steps:

[0042] S1. Obtain the two-dimensional SAR image of the target building and perform preprocessing to form an observation data set;

[0043] S2. The compressed sensing algorithm based on segmented weak orthogonal matching pursuit reconstructs the vertical information of slant range;

[0044] S3. Obtain the target elevation information, and display the 3D point cloud result of the target building.

[0045] In step S1 of this embodiment, if figure 2 As shown, [S 1 ,S 2 ,…S m-1 ,S m ,…S M ] are the two-dimensional SAR images acquired by the sensor for the same target area at different times and different track positions. S m-1 S m The baseline distance between is b ⊥m , S m The vertical distance to the s-axis is δ (δ is caused by the instability of the route, which can be eliminated by correcti...

Embodiment 2

[0066] The solution in this embodiment provides 14 scenes of two-dimensional SAR image data in a certain area. Use ENVI to read the data of the target area of ​​14 scenes, and save the data in a format that MATLAB can read as the preparation data. It is also possible to select only 14 scenes of image data of a single building in the area as the preparation data. The selected area needs to record its coordinate position in the SAR image. The scheme selects 14 scenes of the 2D SAR image of a certain hotel in Beijing as the preparation data.

[0067] 3D point cloud generation of the target area (TomoSAR 3D point cloud imaging algorithm based on compressed sensing SWOMP)

[0068] (1) Read and load data

[0069] Read and load the prepared data into MATLB.

[0070] (2) Determine the location of the target area

[0071] The starting and ending positions of the azimuth and distance directions of the intercepted target image are respectively determined. Read the image data of 14 sc...

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Abstract

The invention provides a tomography SAR 3D imaging method based on stagewise weak orthogonal matching pursuit. The method includes the following steps: S1 acquiring the original SAR data of the target by multiple cruising, performing 2D high resolution imaging, registering, and phase compensation on the original data to obtain the observation data set for tomography SAR imaging; S2 performing the aperture synthesis in the slope distance vertical direction by means of the pretreated multi-view SAR data and reconstructing the information of the slope distance vertical direction; and S3 acquiring the target elevation information and displaying the 3D point cloud result of a target building. According to the method, the information of the slope distance vertical direction well without knowing the slope distance vertical direction signal sparsity can be reconstructed and the 3D imaging of the target building can be realized.

Description

technical field [0001] The present invention relates to the technical field of synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging, more specifically, to a tomographic SAR three-dimensional imaging method based on segmented weak orthogonal matching pursuit. Background technique [0002] SAR is an active earth observation technology. Compared with traditional optical sensors, SAR can realize all-time and all-weather real-time observation of the earth, and has certain surface penetration capabilities. The development of SAR technology has brought about a sharp expansion of the amount of data and calculations, and with the increasing demand for real-time imaging, the real-time imaging processing of large-scale SAR echo data is becoming more and more important. [0003] The application of compressed sensing theory in the field of tomographic SAR imaging is developing rapidly. Various algorithms based on compressive sensing theory have been proposed to expand the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 庞蕾刘慧张学东陈洋何曙光毕辉王勇艾立萍孙萌鑫李林泽王志良
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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