Double-base foresight high-mobility platform SAR imaging method based on echo simulation

A double-base look-ahead and echo simulation technology, which is applied in radio wave reflection/re-radiation, radio wave measurement system, utilization of re-radiation, etc., to achieve high computing efficiency and high computing efficiency

Inactive Publication Date: 2015-09-09
XIDIAN UNIV
View PDF2 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the bistatic forward-looking high maneuvering platform SAR belongs to the shift mode in the bistatic SAR, and the bistatic forward-looking high maneuvering platform SAR has two-dimensional space variation characteristics, which makes the existing echo simulation method not efficient and high-precision Obtain the SAR radar echo signal of the bistatic forward-looking high maneuvering platform

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
  • Double-base foresight high-mobility platform SAR imaging method based on echo simulation
  • Double-base foresight high-mobility platform SAR imaging method based on echo simulation
  • Double-base foresight high-mobility platform SAR imaging method based on echo simulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] refer to figure 1 , is a schematic flow chart of a bibase forward looking height maneuvering platform SAR imaging method based on echo simulation of the present invention, this kind of echo simulation based bibase forward looking height maneuvering platform SAR imaging method comprises the following steps:

[0037] Step 1: Establish the motion geometry configuration of the bistatic forward-looking high maneuvering platform SAR, and obtain the instantaneous bistatic slant distance expression R between the receiver and the point target P bf (t m ), and then get the SAR time-domain echo signal of the point target P Among them, P is any point target in the forward-looking target area of ​​the receiver, Indicates fast time, t m Indicates slow time.

[0038] The specific sub-steps of step 1 are:

[0039] 1.1 Reference figure 2 , to establish the kinematic geometric configuration of the bistatic forward-looking high maneuvering platform SAR, where O is the origin of t...

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 double-base foresight high-mobility platform SAR imaging method based on echo simulation, and the method mainly comprises the following steps: sequentially carrying out range-direction FFT and linear walking momentum correction of an obtained SAR time domain echo signal of a point target firstly, and sequentially obtaining a corrected echo signal and a corrected slant-range course; secondly enabling the corrected slant-range course to be equivalent to a single-base SAR slant-range form, and obtaining a three-order precise approximate expression of the corrected slant-range course; thirdly carrying out the range-direction FFT of the corrected echo signal, and sequentially obtaining a two-dimensional frequency spectrum of the time domain echo signal and the two-dimensional frequency spectrum phase term of the time domain echo signal; employing high-order polynomial-fitting to eliminate the spatial-variant property of the phase term of the two-dimensional frequency spectrum of the time domain echo signal, and obtaining the high-precision two-dimensional frequency spectrum of the time domain echo signal; and finally enabling the high-precision two-dimensional frequency spectrum to sequentially pass through a distance spatial-variant matching filter and a range-direction IFFT and range-Doppler domain matching filter, thereby obtaining an SAR image after focusing.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, in particular to a SAR imaging method for a bistatic forward-looking high maneuvering platform based on echo simulation, that is, a synthetic aperture radar (Synthetic Aperture Radar) for a bistatic forward-looking high maneuvering platform based on echo simulation. , SAR) imaging method, which is suitable for the echo simulation of high-mobility platform SAR, traditional airborne platform bistatic squint SAR and traditional airborne platform bistatic forward-looking SAR, and then obtains better focused SAR imaging. Background technique [0002] Bistatic forward-looking SAR imaging mode is a special bistatic forward-looking SAR imaging mode. In this bistatic forward-looking SAR imaging mode, the transmitter squints, the receiver looks forward, and its range resolution direction and Doppler resolution direction exist The included angle can provide sufficient Doppler bandwidth for forward-loo...

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): G01S13/90G01S13/00G01S7/40
CPCG01S7/4052G01S13/003G01S13/9011G01S13/9058
Inventor 李亚超孟自强翟亚迪全英汇邓欢邢孟道
Owner XIDIAN UNIV
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