Spaceborne ka InSAR signal processing method based on dbf-tops weighting

A DBF-TOPS and signal processing technology, applied in the direction of radio wave reflection/re-radiation, instruments, measurement devices, etc., can solve the problems that the phase preservation algorithm cannot be directly used, the scene azimuth spectrum aliasing, etc.

Active Publication Date: 2021-04-23
王辉
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The classic RD, CS, and ωk algorithms all have the characteristics of phase preservation, but in the spaceborne TOPS mode, the azimuth spectrum of the scene is aliased due to the beam scanning. It is obtained by weighting DBF, so the above-mentioned phase-preserving algorithm cannot be used directly. It is necessary to study a phase-preserving imaging algorithm that can solve the problem of spectral aliasing for the DBF-TOPS mode

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
  • Spaceborne ka InSAR signal processing method based on dbf-tops weighting
  • Spaceborne ka InSAR signal processing method based on dbf-tops weighting
  • Spaceborne ka InSAR signal processing method based on dbf-tops weighting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] Hereinafter, the spirit and essence of the present invention will be further elaborated in conjunction with the drawings and embodiments.

[0046] Take the DBF including 4 channels as an example for illustration. The DBF-TOPS InSAR signal processing flow mainly includes three parts of the processing process: (1) DBF weighting: carry out DBF weighting on the two antennas respectively in the distance direction of the 4 TOPS sub-echoes. Gained TOPS echo; (2) TOPS imaging processing: Imaging processing is performed on the single-channel TOPS signal synthesized by DBF. Due to subsequent interference processing, it is necessary to consider the phase preservation of the imaging algorithm during imaging. After imaging processing, we can obtain Single-view complex images corresponding to two antennas; (3) Interferometric altimetry: Interferometric processing is performed on complex images obtained by two antennas, including image registration, interferometric phase extraction, f...

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 present invention provides a weighted spaceborne Ka InSAR signal processing method based on DBF-TOPS, comprising: step 1, setting up the baseband echo data expression that radar obtains in a Burst data block; step 2, weighting coefficient ω n (τ) is: N is the number of channels, α(τ) is the angle between the receiving beam center and the antenna normal, d 0 is the distance between the phase centers of adjacent receiving antennas, and λ is the operating frequency; step 3, multiply the weighting coefficient with the baseband echo data expression to obtain the beam forming expression; step 4, perform Fourier transform on the formula of step 3 Step 5, the frequency domain weighting coefficient of the expression after Fourier transform is: Step 6, calculate the signal frequency domain expression after weighting; Phase-preserving imaging processing.

Description

technical field [0001] The invention relates to a space-borne KaInSAR signal processing method, in particular to a space-borne KaInSAR signal processing method based on DBF-TOPS weighting. Background technique [0002] Ka-band SAR has the characteristics of short wavelength, weak penetrability, and strong reflection, so the acquired SAR image texture and target subtle features are clearer; but its weak penetrability is unfavorable for land surface surveying and mapping. Since the sea surface is not blocked and the Ka-band reflectivity is strong, the Ka-band InSAR has obvious advantages in sea surface height measurement. Compared with the Ku-band used by traditional altimeters (such as Skylab, Seasat-A, ERS-1 / 2, Jason-1, TOPEX, etc.), the Ka-band ionospheric attenuation delay is low and can basically be ignored. The foreign Saral / AltiKa altimeter uses the Ka band for the first time, but limited by its bottom-looking working mode, the observation width is very narrow, usually...

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): G01S13/90
CPCG01S13/904G01S13/9047
Inventor 王辉
Owner 王辉
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