Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method and system for correcting SAR image geometric positioning parameters

A technology of geometric positioning and parameter correction, which is applied in the direction of radio wave measurement systems, instruments, and measuring devices, can solve the problems of slow processing speed and difficult realization of areas with sparse terrain textures, and achieve the effect of improving the accuracy of geometric positioning

Active Publication Date: 2020-11-03
CHINESE ACAD OF SURVEYING & MAPPING
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is slower than conventional correction processing when dealing with large-area multi-view images, and it is not easy to implement in areas with sparse terrain textures.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method and system for correcting SAR image geometric positioning parameters
  • A method and system for correcting SAR image geometric positioning parameters
  • A method and system for correcting SAR image geometric positioning parameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 Shown is a structural block diagram of a method for correcting SAR image geometric positioning parameters in this embodiment. The SAR image geometric positioning parameter correction method disclosed in this embodiment includes:

[0047] Select a SAR image of a scene in the area as the original SAR image, and establish a SAR image geometric positioning model to generate a SAR terrain texture map;

[0048] Extracting feature points with a certain grid density on the SAR terrain texture map, and matching the extracted feature points with points of the same name on the original SAR image;

[0049] Obtain the image coordinates and geographic coordinates of each feature point that is successfully matched on the original SAR image, and obtain the geometric positioning parameter correction reference point;

[0050] Establishing a geometric positioning parameter correction model according to the SAR image geometric positioning model, using the geometric posit...

Embodiment 2

[0054] The SAR image geometric positioning parameter correction method disclosed in this embodiment includes:

[0055] Step 1. Select a SAR image of a scene in the area as the original SAR image, and establish a SAR image geometric positioning model to generate a SAR terrain texture map.

[0056] Specifically, in an application example. First, for multiple SAR images in a large area, select one SAR image in the area, establish a geometric positioning model according to the imaging parameters, and use the range-Doppler (R-D) model as the geometric positioning model. The positioning model equation can be expressed as:

[0057] f R (X, Y, Z, x, y) = 0

[0058] f D (X, Y, Z, x, y) = 0

[0059] f R is the distance imaging condition observation equation, F D is the observation equation of Doppler imaging conditions, (X, Y, Z) is the geographic coordinates, and (x, y) is the image coordinates. The geographical coordinate range of the image is obtained by positioning the four c...

Embodiment 3

[0073] A SAR image geometric positioning parameter correction system disclosed in this embodiment includes:

[0074] The SAR terrain texture map generation module is used to establish a SAR image geometric positioning model and generate a SAR terrain texture map according to the SAR image of a scene in the selected area;

[0075] A matching module, for extracting feature points with a certain grid density on the SAR terrain texture map, and matching the extracted feature points with points of the same name on the original SAR image;

[0076] Correction reference point generation module, used to obtain the image coordinates and geographic coordinates of each feature point that is successfully matched on the original SAR image, as a geometric positioning parameter correction reference point;

[0077] A correction value generating module, configured to establish a geometric positioning parameter correction model according to the SAR image geometric positioning model, use the geomet...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a geometric positioning parameter correction method for SAR images, and aims at a problem of high-precision geometric positioning of the SAR images of multiple scenes in a large area. According to the method, an SAR terrain texture map is generated by utilizing geometric imaging information of the SAR image of one scene and DEM data, geometric positioning parameter correction reference points are extracted through feature point extraction and matching, a geometric positioning parameter correction model is established according to a geometric positioning model for the SAR image, a geometric positioning parameter correction value of the image is computed by utilizing the correction reference points, and lastly, the geometric positioning parameters of other SAR imagesare corrected by utilizing the correction value, so that the geometric positioning precision of the SAR images in the whole area is improved, and large-range high-precision geometric processing of the SAR images without a control point is realized.

Description

technical field [0001] The invention relates to the field of digital photogrammetry of remote sensing images, in particular to high-precision geometric positioning and correction processing of synthetic aperture radar images. Background technique [0002] As an active imaging sensor, synthetic aperture radar has all-weather and all-weather imaging capabilities and can penetrate some ground objects. application. With the emergence of high-resolution, multi-polarization, and multi-band SAR systems, synthetic aperture radar remote sensing technology will play a more important role in more fields, which also puts forward higher requirements for SAR data processing. [0003] SAR image geometric positioning and correction processing is the basis of SAR image applications. To achieve high-precision SAR image geometric positioning and correction, it is necessary to analyze the source of SAR image geometric positioning errors and use certain methods to correct the errors. The geome...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/40
CPCG01S7/40
Inventor 杨书成黄国满程春泉赵争段连飞
Owner CHINESE ACAD OF SURVEYING & MAPPING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com