Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for improving GNSS-SAR range compressed signal resolution

A signal compression, high-resolution technology, applied in the field of SAR imaging, to achieve the effect of reducing signal side lobes, reducing interference, and improving range resolution

Active Publication Date: 2019-08-16
CHANGSHA UNIVERSITY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a method for improving the GNSS-SAR range-to-compression signal resolution for the problem that the existing optimal range-to-resolution is limited to twice the signal bandwidth value

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
  • Method for improving GNSS-SAR range compressed signal resolution
  • Method for improving GNSS-SAR range compressed signal resolution
  • Method for improving GNSS-SAR range compressed signal resolution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The method for GNSS-SAR high-resolution remote sensing imaging provided by the present invention will be further explained in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The first step is to preprocess the received GNSS-SAR echo signals to generate range-compressed signals.

[0029] For the reception of GNSS-SAR signal and the received signal model, please refer to literature [1-2]. Set in GNSS-SAR, Indicates the kth echo signal in the range time domain when the range direction is t and the azimuth direction is u; s m (t,u) represents the local matched filter signal when the distance direction is t and the azimuth direction is u. The preprocessing of the distance compression of the present invention is about to with s m (t,u) performs correlation operations in each code period T, and the expression of its signal term is:

[0030]

[0031] in represents the result of preprocessing; Indicates the pseudo-rando...

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 method for improving the GNSS-SAR range compressed signal resolution. The technical scheme comprises the following steps: preprocessing a received GNSS-SAR echo signal to generate a range compressed signal; performing square processing on the range compressed signal on each sampling point; performing second derivative processing with respect to range delay on the above result to obtain a resolution-enhanced range compressed signal; and performing carrier phase recovery processing on the resolution-enhanced range compressed signal to obtain a high-resolution range compressed signal. By adopting the method provided by the invention, the range resolution of the signal can be greatly improved without affecting the subsequent processing of radar imaging.

Description

technical field [0001] The invention belongs to the technical field of SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) imaging. Specifically, the invention relates to a method for processing the obtained range-compressed signal to improve its range resolution. Background technique [0002] A passive SAR system using GNSS (Global Navigation Satellite System, Global Navigation Satellite System) as a transmission source of opportunity (Transmission of opportunity), referred to as GNSS-SAR, has received extensive attention in the past ten years. Since its system does not require a specific signal transmitting device, its cost is much lower than that of traditional active SAR, and its concealment and anti-electronic detection performance are better. And because the transmission of GNSS signals is never interrupted, compared with other forms of passive SAR, GNSS-SAR can detect targets all-weather and without blind spots. [0003] However, due to the limitation of the GNS...

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
CPCG01S7/41G01S13/9058
Inventor 郑昱张竹娴冯璐朱培栋吴鹏
Owner CHANGSHA UNIVERSITY
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com