Doppler parameter estimation method based on image quality evaluation

A technology for image quality assessment and Doppler parameters, which is applied in the field of evaluating image quality and estimating Doppler parameters, and in the field of synthetic aperture radar imaging. Universal effect

Active Publication Date: 2021-10-29
北京理工雷科电子信息技术有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each algorithm has limitations. It can only be applied to scenes and application backgrounds with different characteristics. It cannot be imaged in various scenes and application backgrounds. It cannot be imaged normally at the same time in ideal flight and unstable flight scenes.

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
  • Doppler parameter estimation method based on image quality evaluation
  • Doppler parameter estimation method based on image quality evaluation
  • Doppler parameter estimation method based on image quality evaluation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0027] Concrete processing flow of the present invention is as figure 1 As shown, it includes the following sub-steps and the specific instructions are as follows:

[0028] Step 1, read in the echo data and aircraft parameters, and set various system parameters, the specific steps are divided into:

[0029] S11, read in the echo data, set the number of points in the azimuth direction as Na, and the number of points in the range direction as Nr, then the echo data is a matrix of Na*Nr size;

[0030] S12, read in the aircraft parameters: aircraft speed, aircraft altitude, antenna azimuth, antenna pitch angle, aircraft heading angle, roll angle, pitch angle;

[0031] S13, setting various system parameters: bandwidth, sampling rate, pulse width, repetition frequency, and imaging center action distance.

[0032] Step 2, distance processing, the spe...

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 Doppler parameter estimation method based on image quality evaluation, which can be suitable for realizing normal imaging in ideal flight and unstable flight scenes under various scenes and application backgrounds. According to the method, the image definition is evaluated through entropy values, Doppler parameters are estimated through a two-dimensional search method, normal imaging can be achieved in ideal flight and unstable flight scenes, the problem that imaging can be achieved in various scenes and application backgrounds is solved, and the method has the advantages of being high in efficiency and high in scene universality.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and relates to a synthetic aperture radar imaging method in the field of airborne radar, in particular to a method for estimating Doppler parameters by evaluating image quality when the airborne radar images the ground. Background technique [0002] Airborne Synthetic Aperture Radar (SAR) system is a coherent imaging system capable of producing high-resolution images. Its high-resolution capability requires a stable geometric relationship between the aircraft and the imaging area. Affected by atmospheric turbulence, the flight attitude of the carrier aircraft often deviates from the ideal state, resulting in large estimation errors of Doppler parameters (including Doppler center frequency and Doppler modulation frequency), which seriously affect the imaging effect. The Doppler center frequency corresponds to the energy center of the radar beam, and a large estimation error will cause the im...

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 Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9019
Inventor 王长杰暴泰吏刘腾飞
Owner 北京理工雷科电子信息技术有限公司
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