Improved double-base synthetic aperture radar NLCS imaging algorithm

A synthetic aperture radar, bistatic technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of distance-to-frequency modulation, two-dimensional space variability not considered, secondary model failure, etc.

Inactive Publication Date: 2013-02-06
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the transmitter operates in squint mode, the quadratic model fails when using the stationary phase principle to convert the signal from the two-dimensional frequency domain to the range-Doppler domain
This traditional NLCS algorithm not

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
  • Improved double-base synthetic aperture radar NLCS imaging algorithm
  • Improved double-base synthetic aperture radar NLCS imaging algorithm
  • Improved double-base synthetic aperture radar NLCS imaging algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0067] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0068] This embodiment adopts the fixed mode of two bases and one station, the satellite is used as the transmitter, and the fixed receiver is placed on the ground. The system parameters are as follows:

[0069] Transmitter operating wavelength λ: L band

[0070] Transmitter speed V: 7200m / s

[0071] Transmit signal distance to bandwidth B r :60MHZ

[0072] Pulse repetition frequency PRF: 1700HZ

[0073] Oblique Angle: 8°

[0074] Receiver height: 1000m

[0075] Scene length: 5000m

[0076] Scene width: 3000m

[0077] Adopt the improved bistatic synthetic aperture radar NLCS imaging algorithm of the present invention,

[0078] Using the right-handed Cartesian coordinate system principle, set the direction parallel to the transmitter track as the y-axis direction, the direction perpendicular to the track as the x-axis dire...

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 an improved double-base synthetic aperture radar NLCS (Nonlinear Chirp Scaling) imaging algorithm. The improved double-base synthetic aperture radar NLCS imaging algorithm comprises the following specific steps: firstly, calculating a cubic phase phi 3 of range direction of a target echo, selecting a reference point, acquiring a cubic phase phi'3 at the reference point according to the phi 3 and then multiplying the target echo by the conjugation of phi'3 at the reference point in a two-dimensional frequency domain to obtain a signal for eliminating the influence of high-order phase; secondly, multiplying the processed signal in the first step by a disturbing function phi in a range Doppler domain and multiplying the multiplied result by a matched filter phi R in the two-dimensional frequency domain; thirdly, converting the processed signal in the second step to a two-dimensional time domain to be multiplied by a direction distribution function phi 4, then multiplying the multiplied result and a matched filter phi 5 in the range Doppler domain and finally multiplying the multiplied result and phi 6 in the two-dimensional time domain to obtain an SAR (Synthetic Aperture Radar) slope-distance image; and fourthly, carrying out geometric rectification on the SAR slope-distance image acquired in the third step to obtain an SAR ground range image. According to the improved double-base synthetic aperture radar NLCS imaging algorithm, the influence generated by the two-dimensional spatial variability of the range tuning frequency and high-order phase when a sender is seen obliquely is improved.

Description

technical field [0001] The invention relates to an improved bistatic synthetic aperture radar NLCS imaging algorithm, which belongs to the technical field of synthetic aperture radar data processing. Background technique [0002] Compared with monostatic radar, bistatic radar has the advantages of flexible configuration, rich information acquisition, anti-interception and anti-interference due to the special configuration of bistatic radar. These advantages and application prospects have made bistatic radar more and more popular in recent years. favor. Bistatic radar includes many configuration modes, which are classified according to the type of transceiver platform, mainly including spaceborne bistatic SAR, airborne bistatic SAR, star-based bistatic SAR, ground-based bistatic SAR, etc. [0003] In the fixed mode of two bases and one station, the relative position of the transceiver changes with time, so the Doppler histories of targets at different azimuth positions are d...

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): G01S13/90
Inventor 曾涛胡程吴立薪刘飞峰倪崇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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