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Star machine united SAR (Synthetic Aperture Radar) two-dimensional frequency domain imaging method based on airspace domain expansion

A two-dimensional frequency domain, imaging method technology, applied in the field of radar, can solve the problems of tedious derivation of spectrum, inability to express the spatial characteristics of scattering points explicitly, and complexity.

Inactive Publication Date: 2010-09-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0012] In summary, the time-domain unwrapping of the distance history not only makes the derivation of the spectrum lengthy and complicated, but also fails to explicitly express the spatial characteristics between the scatter points

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  • Star machine united SAR (Synthetic Aperture Radar) two-dimensional frequency domain imaging method based on airspace domain expansion
  • Star machine united SAR (Synthetic Aperture Radar) two-dimensional frequency domain imaging method based on airspace domain expansion
  • Star machine united SAR (Synthetic Aperture Radar) two-dimensional frequency domain imaging method based on airspace domain expansion

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Embodiment Construction

[0100] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0101] Step 1: Use computer simulation to generate the simulation data of the satellite-machine joint bistatic synthetic aperture radar, and the system parameters required for the simulation are shown in Figure 3 . And define the SAR imaging space and initialize the imaging system parameters;

[0102] Select the unit vector parallel to the velocity direction of the satellite platform and within the ground plane as the first coordinate base of the SAR imaging space In addition, select the second coordinate base of the SAR imaging space

[0103] Initialize satellite relative ground velocity vector Receive platform velocity vector, that is, aircraft velocity vector Launch platform initial position vector Receive platform initial position vector use the formula ...

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Abstract

The invention discloses a star machine united bistatic synthetic aperture radar two-dimensional frequency domain imaging method based on airspace domain expansion. By utilizing the characteristic that airspace expansion of distance history and second-order time domain of reference point distance history are approximate, a phase is expressed to a quadratic polynomial with respect to the slow time, and a stationary phase method is utilized to obtain a two-dimensional spectrum of a signal, good focus results can be obtained through azimuth and distance compression, and finally linear relationship of scattering point position is utilized to peel coordinates of the distance and the azimuth from a coupling term so as to obtain the correct coordinates. Therefore, the invention overcomes the complex process of two-dimensional spectrum calculation and target spatially variable compensation and realizes star machine united bistatic synthetic aperture radar imaging in larger scenes. The invention can be applied to the fields of synthetic aperture radar imaging, earth remote sensing, and the like.

Description

Technical field: [0001] The invention belongs to the technical field of radar, and in particular relates to a bistatic synthetic aperture radar imaging method in a star-machine joint mode in the synthetic aperture radar (SAR) imaging technology. Background technique: [0002] Bistatic Synthetic Aperture Radar (Bistatic SAR) is a new type of synthetic aperture radar system in which the receiver and transmitter are installed on different moving platforms. As a special mode of bistatic synthetic aperture radar, Spaceborne-Airborne Bistatic SAR adopts the working mode of satellite transmission and single (multiple) aircraft reception. At the same time, it also has the following unique advantages: [0003] 1. The unique "far-send and close-to-receive" mode not only gives full play to the advantages of high satellite station, far-sightedness, and wide coverage, but also maintains a high image signal-to-noise ratio; [0004] 2. Reduce the demand for satellite power, data transmis...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张晓玲杨悦师君向高
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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