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

A Judgment and Processing Method for Ionospheric Dispersion Effect of Spaceborne SAR

A technology of dispersion effect and processing method, which is applied in the field of judgment and processing of ionospheric dispersion effect of spaceborne SAR, can solve the problems of defocusing of imaging results, and achieve the effect of improving signal processing efficiency and suppressing ionospheric dispersion effect.

Active Publication Date: 2022-07-29
AEROSPACE INFORMATION RES INST CAS
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the frequency band is low (such as L-band and P-band) and the solar activity is strong, it will cause serious defocusing in the imaging results

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 Judgment and Processing Method for Ionospheric Dispersion Effect of Spaceborne SAR
  • A Judgment and Processing Method for Ionospheric Dispersion Effect of Spaceborne SAR
  • A Judgment and Processing Method for Ionospheric Dispersion Effect of Spaceborne SAR

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this paper, the system parameters of the actual L-band spaceborne SAR are used for simulation to show whether the influence of the setting of the decision threshold on the ionospheric dispersion effect is reasonable. figure 2 Under the system parameters of a spaceborne L-band SAR, the variation of azimuth image migration with the azimuth TEC gradient value is given. Assuming that the range resolution is 3 m, it can be seen that when the azimuth TEC gradient is greater than 0.0095TECU / km, the azimuth offset will exceed half of the range resolution. At this time, the offset cannot be ignored, and ionospheric space degeneration is required. Correction. image 3 The variation of QPE with TEC when the bandwidth is 150 M under the system parameters of a spaceborne L-band SAR is given. It can be seen that when the TEC is greater than 16 TECU, the QPE will be greater than the threshold π / 4. At this time, the dispersion effect will have a non-negligible impact on the range ...

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 method for judging and processing spaceborne SAR ionospheric dispersion effects, so as to realize high precision of spaceborne SAR data products and high efficiency of signal processing. Combined with the proposed decision method, the established processing flow includes: using the IRI model to obtain the TEC parameters, and combining the spaceborne SAR system parameters to calculate the characteristic parameters of the ionospheric dispersion effect, namely AIO, QPE and CPE; judging whether AIO, QPE and CPE are Exceed the respective threshold values, and obtain the corresponding decision flag bit; decide whether to perform various correction steps of the ionospheric dispersion effect according to the decision flag bit. By means of the present invention, an efficient processing flow for the correction of the ionospheric dispersion effect of the spaceborne SAR can be established.

Description

technical field [0001] The invention relates to the field of spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR), in particular to a method for judging and processing the ionospheric dispersion effect of spaceborne SAR. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave imaging radar with all-weather and all-weather working characteristics. unique advantage. [0003] For many military or civil applications, such as biomass retrieval, disaster warning, environmental monitoring, etc., low-frequency radar signals (usually less than 2 GHz) with better penetrating performance are usually used. However, due to the existence of the ionosphere, problems such as dispersion effects will affect the signal, resulting in defocusing and geometric shift in the imaging results. Aiming at the problem of ionospheric dispersion effect, the traditional correction idea is to perform correction before interference processing. But when the freque...

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): G01S7/41G01S13/02G01S13/90
CPCG01S7/41G01S13/0218G01S13/9023
Inventor 林昊宇邓云凯张衡王冬红王吉利刘大成
Owner AEROSPACE INFORMATION RES INST CAS
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