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Shift invariant airborne bistatic synthetic aperture radar target positioning method

A synthetic aperture radar, target positioning technology, applied in the reflection/re-radiation of radio waves, special data processing applications, use of re-radiation and other directions, can solve problems such as target positioning that cannot be applied to bistatic SAR

Active Publication Date: 2015-07-01
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, the geometric configuration of bistatic SAR and monostatic SAR is very different, so this method cannot be applied to bistatic SAR target positioning.

Method used

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  • Shift invariant airborne bistatic synthetic aperture radar target positioning method
  • Shift invariant airborne bistatic synthetic aperture radar target positioning method
  • Shift invariant airborne bistatic synthetic aperture radar target positioning method

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Embodiment Construction

[0106] The technical solution of the present invention will be further described below in conjunction with the figures and specific embodiments.

[0107] Such as figure 1 As shown, a shift-invariant airborne bistatic synthetic aperture radar target positioning method includes the following steps:

[0108] S1. Calculating the echo data of bistatic SAR: Let the center point of the scene be irradiated by the center of the beam, the launch platform is fixed, and the position is recorded as (x T ,y T ,z T ), where x T 、y T and h T are the x-axis, y-axis and z-axis coordinates of the transmitting station; the position of the receiving station is recorded as (0,0,h R ), where 0, 0 and h R They are the x-axis, y-axis and z-axis coordinates of the receiving station respectively; the speed of the receiving station and the transmitting station is recorded as V, and they move along the y-axis; 3D coordinate system for axes:

[0109] Write the azimuth time vector as: ...

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Abstract

The invention discloses a shift invariant airborne bistatic synthetic aperture radar target positioning method. The method includes the following steps: S1, calculating echo data of bistatic SAR; S2, performing distance-to-pulse compression on the echo data; S3, performing Doppler center-of-mass estimation on a scene center point; S4, positioning the scene center point; S5, focusing the echo data; S6, positioning all target points in a scene; S7, performing ground scene projection on a target scene. By the method, accurate positioning of imaging target points under the bistatic SAR is realized, and geographic position of a whole image is quickly guided out by utilizing a relation expression of adjacent pixel points and projected into a geographic coordinate system, so that calculation quantity is reduced greatly; the method can be widely applied in the fields of geometric correction, target positioning, moving target detection of the bistatic SAR image.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a target positioning method for a shift-invariant airborne bibase synthetic aperture radar. Background technique [0002] SAR (Synthetic Aperture Radar) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar. In areas such as detection, SAR has played an increasingly important role. [0003] Bistatic SAR has many outstanding advantages due to the separation of transceivers. It can obtain the non-backscatter information of the target, and has the characteristics of long range, concealment and strong anti-interference. In addition, since the bistatic SAR receiver does not contain high-power devices, it has low power consumption, small size, and light weight, making it easy to carry on various types of aircraft and low in cost. In a word, bistatic SAR, as a new means of space observation of the earth, has a broad space for deve...

Claims

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Application Information

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IPC IPC(8): G01S13/06G01S13/90G06F19/00
CPCG01S13/904G01S13/9029G01S13/9058
Inventor 杨建宇钟徐琦武俊杰黄钰林杨海光李中余杨晓波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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