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Range migration imaging method of shift invariant bi-static synthetic aperture radar

A technology of distance migration and imaging method, applied in the field of radar

Active Publication Date: 2014-07-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problems existing in the existing shift-invariant bistatic SAR imaging algorithm, and propose a shift-invariant bistatic synthetic aperture radar range migration imaging method

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  • Range migration imaging method of shift invariant bi-static synthetic aperture radar
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  • Range migration imaging method of shift invariant bi-static synthetic aperture radar

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Embodiment Construction

[0067] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2010. The present invention will be further described in detail with regard to specific embodiments below.

[0068] The structural diagram of the fixed station bistatic SAR system adopted in the specific embodiment of the present invention is as follows figure 1 As shown, in the Cartesian coordinate system, set the launch platform position as (x T ,y T , h T ), the zero time position of the receiving station is denoted as (x R ,y R , h R ), the speed of the receiving station is recorded as υ, the coordinates of any imaging point are marked as P(x, y), the system coordinate system is based on the origin of the coordinates of the imaging center point and the target O, the platform moves along the y-axis, the x-axis is the direction of the tangential track, and z The axis is vertical to the ground. Before introducing the me...

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Abstract

The invention discloses a range migration imaging method for a shift-invariant bistatic SAR. The method of the invention is based on the bistatic SAR two-dimensional spectrum of the generalized Loffeld transform, and linearly expands the phase of the spectrum along the shortest slant distance of the receiving station to derive the Stolt frequency. The transformation expression, through which the residual range unit migration correction, residual secondary range compression and residual azimuth compression are completed, and the spatial domain linearization and frequency domain linearization of the residual phase are realized, thereby realizing the accurate shift-invariant bistatic SAR focus. Compared with the existing shift-invariant bistatic SAR distance migration algorithm, the method of the invention has simple form, high precision and high operation efficiency.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a shift-invariant bistatic synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging method in synthetic aperture radar imaging technology. Background technique [0002] SAR is an all-day, all-weather modern high-resolution microwave remote sensing imaging radar. 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, and is easy to carry on various types of aircraft, and its cost is low. In a word, bistatic SAR, as a new means of space observation of the earth, has a broad space for development in many fields. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 武俊杰李中余黄钰林杨海光杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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