Synthetic aperture radar SAR imaging method and device

A technology of synthetic aperture radar and imaging method, which is applied in the directions of measuring devices, radio wave reflection/re-radiation, and utilization of re-radiation, etc., and can solve problems such as SAR image defocus, distortion, and SAR image blur

Inactive Publication Date: 2014-08-20
INST OF ELECTRONICS CHINESE ACAD OF SCI
View PDF2 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the disturbance of the atmosphere, the actual route of the airborne SAR platform has a certain deviation from the ideal route, resulting in blurring and distortion of the SAR image, that is, defocusing of the SAR image.

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
  • Synthetic aperture radar SAR imaging method and device
  • Synthetic aperture radar SAR imaging method and device
  • Synthetic aperture radar SAR imaging method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] An embodiment of the present invention provides a SAR imaging method, such as figure 1 As shown, the method mainly includes the following steps:

[0050] Step 101, performing range-wise non-spatial motion compensation processing on the original SAR data;

[0051] In this step, first, according to the geometric relationship between the actual flight path and the ideal flight path and the original SAR data in the navigation system, the motion error offset of the actual flight path relative to the ideal flight path is obtained, and according to the motion error of the original SAR data The offset is used to obtain the error phase of the original SAR data; and with the center of the observation scene as the reference point, the original SAR data is subjected to non-spatial motion compensation processing in the range direction according to the error phase of the original SAR data.

[0052] specifically, figure 2 Shows the geometric relationship between the actual flight p...

Embodiment 2

[0101] Compared with Embodiment 1, the embodiment of the present invention also provides a SAR imaging device, such as Figure 5 As shown, the device includes: a compensation module 51, a compression module 52, and a focus processing module 53; wherein,

[0102] The compensation module 51 is used to perform range-to-non-spatial motion compensation processing on the original SAR data; and correct the residual error phase of the SAR data according to the residual error phase of the SAR data sent by the focus processing module 53;

[0103] The compression module 52 is configured to perform range compression processing on the SAR data after motion compensation by the compensation module 51 ; and perform azimuth compression processing on the SAR data corrected by the compensation module 51 .

[0104] The focusing processing module 53 is used to obtain the residual error phase of the SAR data by performing range-space-varying PGA processing on the SAR data after the range compressio...

Embodiment 3

[0149] In order to verify the accuracy and reliability of the above embodiment, this embodiment takes a mountainous area with a resolution of 0.15 meters as an example, and uses the radar imaging method in the prior art solution and the radar imaging method provided by each embodiment of the present invention to analyze the SAR images for comparison. Figure 6 It shows a SAR image with defocus after motion compensation in the prior art; Figure 7 Shows the SAR image processed by the standard PGA in the prior art; Figure 8 The SAR images provided by the embodiments of the present invention are shown; it can be seen from these images that compared with the prior art, the SAR imaging method provided by the embodiments of the present invention can achieve precise focusing of the SAR image, thereby obtaining a good SAR images.

[0150] At the same time, this embodiment takes two observation scenes A and B in a mountainous area with a resolution of 0.15 meters, wherein, Figure ...

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 discloses a synthetic aperture radar SAR imaging method which comprises the following steps: distance-direction non-space-variant motion compensation processing is performed on original SAR data, and distance-direction compression processing is performed on the motion-compensated SAR data; distance-direction space-variant phase gradient auto-focusing PGA processing is performed on the distance-direction compressed SAR data, and the residual error phase of the SAR data is acquired and corrected; and azimuth-direction compression processing is performed on the corrected SAR data. The invention further discloses an SAR imaging device.

Description

technical field [0001] The invention relates to the technical field of airborne radar imaging, in particular to a synthetic aperture radar (SAR, Synthetic Aperture Radar) imaging method and device. Background technique [0002] SAR is a microwave remote sensing device with all-weather and all-weather characteristics, which is widely used in terrain surveying and mapping, ocean monitoring, disaster forecasting and target recognition and other fields. SAR can be installed on satellites or aircraft to obtain high-resolution microwave images of the observed scene. Due to the disturbance of the atmosphere, the actual route of the airborne SAR platform has a certain deviation from the ideal route, resulting in blurring and distortion of the SAR image, that is, defocusing of the SAR image. Therefore, how to accurately remove the motion error of the airborne SAR platform to obtain a precisely focused SAR image is an important problem that needs to be solved urgently. Contents of ...

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
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/40G01S7/41G01S13/90G01S13/9019
Inventor 刘亚波龚小东张磊李宁王宇邓云凯
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap