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GEO satellite-airborne bistatic SAR non-fuzzy imaging method

An imaging method and an unambiguous technology, applied in the field of radar, can solve the problems of inability to accurately image SAR echo signals, huge storage space and computing resources, and achieve the effect of avoiding calculation and storage and improving the imaging rate

Active Publication Date: 2021-08-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, this method needs to construct an observation matrix for scene recovery, so it requires huge storage space and computing resources
It can be seen that none of the above methods can efficiently and accurately image the SAR echo signals in the GEO satellite bistatic SAR working mode

Method used

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  • GEO satellite-airborne bistatic SAR non-fuzzy imaging method

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Embodiment Construction

[0031] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2020. The present invention will be further described in detail with regard to specific embodiments below.

[0032] Such as figure 1 Shown is the method flowchart of the present invention, comprises the following steps:

[0033] Step S0: Establish the geometric relationship of the GEO star-machine dual-base SAR

[0034] The observation geometry of the GEO satellite bistatic SAR in the local coordinate system of the reference target is as follows: figure 2 shown. Satellites provide beam coverage over the target area in high orbit, and onboard receivers receive the echoes in strips. The coordinate center is recorded as O, the receiver flies parallel to the y-axis, and the flight speed is recorded as v R , the receiver position (x R ,y R ,z R ), x R 、y R ,z R are the x, y, z axis coordinates of the receiver respectivel...

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Abstract

The invention discloses a GEO satellite-airborne bistatic SAR non-fuzzy imaging processing method and belongs to the technical field of radars, aims at solving the problem that efficient and accurate imaging cannot be carried out on SAR echo signals in the working mode of a GEO satellite-airborne bistatic SAR in the prior art. The method comprises the following steps of: firstly, completing the construction of an echo signal model according to a GEO satellite-airborne bistatic SAR geometrical relationship; establishing an azimuth undersampling echo decoupling observation model; converting the decoupling observation model into a sparse and low-rank joint solving problem; and finally, performing scene recovery by using an improved alternating direction multiplier method to obtain an imaging result. The method can effectively solve the problem of low calculation efficiency in the non-fuzzy imaging of a GEO satellite-airborne bistatic SAR, and can realize the efficient and high-precision imaging of the GEO satellite-airborne bistatic SAR.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a GEO (Geosynchronous Earth Orbits, geosynchronous orbit) star-machine dual-base SAR imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) is an all-weather, all-weather high-resolution imaging system, which transmits a large time-width product chirp signal and receives a pulse-compressed signal through matched filtering to obtain a range-wise High resolution, using synthetic aperture technology to achieve high resolution in azimuth. The imaging quality is not affected by weather conditions (clouds, light), etc., and has the characteristics of detecting and locating long-distance targets. Typical applications of SAR include disaster monitoring, resource exploration, geological surveying and mapping, military reconnaissance, etc. [0003] Compared with the airborne bistatic SAR, the GEO satellite bistatic SAR provides a unique ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41G06F30/20
CPCG01S13/9058G01S13/9021G01S7/41G06F30/20
Inventor 安洪阳武俊杰王朝栋孙稚超李中余杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA