Unlock instant, AI-driven research and patent intelligence for your innovation.

A dem-assisted SAR image high-precision registration method

A high-precision, image-based technology used in microwave remote sensing

Active Publication Date: 2021-11-09
NAT UNIV OF DEFENSE TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a DEM-assisted SAR image high-precision registration method, which effectively solves the partial registration of the existing SAR image two-dimensional function registration method in the case of long baselines and complex terrain areas. Low precision phenomenon

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 dem-assisted SAR image high-precision registration method
  • A dem-assisted SAR image high-precision registration method
  • A dem-assisted SAR image high-precision registration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] figure 1 It is a schematic flow chart of the principle of the present invention. Combine below figure 1 Describe in detail.

[0012] Step 1: Calculate the elevation corresponding to each pixel of the main image through the orbital parameters of the main image and the corresponding DEM. The geographic coordinates (B, L, H) (longitude, latitude, elevation) of each point on the DEM geographic grid are substituted into the range-Doppler model under the conditions of the main image orbit parameters and imaging parameters for processing. For specific methods, refer to the paper " Utilization of Spaceborne SAR Data for Mapping" (IEEE Transactions on geoscience and remotesensing, Vol.22, No.2, March 1984, pages 107 to 108), it is possible to obtain the corresponding grid points of the DEM geographic grid in the main image , so as to obtain the corresponding elevation h(i, j) of each pixel (i, j) of the main image (i is the azimuth coordinate, and j is the distance coordinate...

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 provides a DEM-assisted SAR image high-precision registration method. The technical solution is: for two SAR images obtained from the same scene, calculate the elevation corresponding to each pixel in the main image; then select an appropriate amount of pixels on the main image as control points, and obtain the corresponding height of the control points in the auxiliary image through the correlation coefficient method. The pixel position of the control point, the azimuth registration offset and the range registration offset between the main image and the auxiliary image at the control point can be obtained; , the polynomial corresponding to the elevation of the pixel; finally, the parameters of each pixel of the main image are substituted into the polynomial, and the azimuth and distance registration offsets between the main image pixel and the corresponding pixel of the auxiliary image can be obtained to complete the SAR Image registration. The invention solves the problem of low local registration accuracy of the existing SAR image two-dimensional function registration method when the long baseline is in the long baseline and complex terrain area.

Description

technical field [0001] The invention relates to the field of microwave remote sensing technology, in particular to a DEM (Digital Elevation Model) assisted SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) image high-precision registration method. Background technique [0002] InSAR (Interferometry Synthetic Aperture Radar, Synthetic Aperture Radar Interferometry) is an earth observation technology, which obtains three-dimensional information of the earth's surface by interfering with multiple SAR complex images acquired by radar satellites under different observation geometries. SAR image registration is the first step in the InSAR processing flow. The accuracy of SAR image registration is crucial to the subsequent processing steps and the final InSAR product. Usually, the accuracy of SAR image registration is required to reach the sub-pixel level. [0003] In SAR image registration, two SAR images are generally used, and one of the images can be selected arbitrarily...

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): G06T7/33G06T17/05
CPCG06T17/05G06T2207/30181G06T7/33
Inventor 甘本对余安喜孙造宇董臻张永胜何峰何志华金光虎张启雷李德鑫
Owner NAT UNIV OF DEFENSE TECH