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One-station fixed bistatic CSAR spatial resolution estimation method

A spatial resolution, bistatic technology, applied in the field of radar, can solve the problems of radar system design and image quality evaluation errors, inaccurate resolution estimation, etc., to achieve accurate spatial resolution and reduce estimation errors

Pending Publication Date: 2021-10-22
SUN YAT SEN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the error caused by this rectangular spectrum approximation will inevitably lead to inaccurate resolution estimation, which will bring great influence on radar system design and image quality evaluation (spatial resolution, peak sidelobe ratio, integral sidelobe ratio, etc.). error

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  • One-station fixed bistatic CSAR spatial resolution estimation method
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  • One-station fixed bistatic CSAR spatial resolution estimation method

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[0058] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0059] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0060] It is understood by those skilled in the art that certain known structures and descriptions thereof may be omitted in the drawings.

[0061] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0062] The present invention is illustrated by taking a station fixed bistatic CSAR system as an example. The CSAR system includes an airborne motion radar and a fixed radar located on the top of a mountain. At slow time η, the position of the airborne motion radar is r M (φ)=(x M (φ),y M (φ), z M (φ))=(R xy cos(φ),R xy sin(φ),z M ), φ∈[0,2π] is the angle variable of motion radar, and φ(η)=V M...

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Abstract

The invention provides a one-station fixed bistatic CSAR spatial resolution estimation method, and the method comprises the steps: determining and obtaining system parameters, i.e., a radar signal center wavelength, a relative bandwidth and a radar incident angle, which affect the one-station fixed bistatic CSAR spatial resolution according to the imaging configuration of a radar system; then, analyzing the spatial wave number of a scene center point target, and obtaining components of a wave number vector in the X-axis direction, the Y-axis direction and the Z-axis direction; and finally, calculating wavenumber domain supports of the scene center point target in the X-axis direction, the Y-axis direction and the Z-axis direction, obtaining a calculation expression of the spatial resolution of the scene center point target, and carrying out spatial resolution estimation. The method is suitable for spatial resolution estimation of the one-station fixed bistatic CSAR, spatial resolution estimation errors can be effectively reduced, the more accurate spatial resolution of the one-station fixed bistatic CSAR is obtained, and design and image quality evaluation of a one-station fixed bistatic CSAR system are facilitated.

Description

technical field [0001] The present invention relates to the field of radar technology, and more specifically, to a method for estimating spatial resolution of a one-station fixed bistatic CSAR. Background technique [0002] Circular Synthetic Aperture Radar (CSAR) is a Synthetic Aperture Radar (SAR) system whose radar trajectory is a circle, and has become a research hotspot in the field of SAR. Compared with the linear motion trajectory SAR (LSAR) system, the circular radar motion trajectory makes the CSAR system have important performance, it can obtain the highest resolution SAR image and enhance the scattering information of the target, because it can acquire the omnidirectional (360°) target The echo signals are coherently added. In recent years, a large number of CSAR research and experiments have been carried out at home and abroad, and good CSAR images have been obtained. In addition, compared with the LSAR system, the CSAR system has a better ability to detect jun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/40
CPCG01S13/9088G01S7/40
Inventor 谢洪途陈佳兴王国倩
Owner SUN YAT SEN UNIV