NLCS imaging method of curvilinear motion bistatic SAR

A technology of curved motion, imaging method, applied in the direction of radio wave reflection/re-radiation, radio wave measurement system, utilization of re-radiation, etc.

Active Publication Date: 2021-09-17
HUAQIAO UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the needs of special scenes such as multi-angle observation targets in practical application scenes, a kind of NLCS imaging method of double-base S

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  • NLCS imaging method of curvilinear motion bistatic SAR
  • NLCS imaging method of curvilinear motion bistatic SAR
  • NLCS imaging method of curvilinear motion bistatic SAR

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Embodiment Construction

[0080] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2016a. The present invention will be further described in detail below in conjunction with the drawings and specific embodiments of the invention.

[0081] like figure 2 As shown, the present invention is a NLCS (Non-Linear Chirp Scaling) imaging method of curved motion bistatic SAR based on Chebyshev orthogonal decomposition, aiming at special scene requirements such as multi-angle observation targets, constructing the slope of curved motion bistatic SAR The range function expression is used to establish the bistatic SAR echo model with curved motion.

[0082] Specifically, the geometric configuration of the double base SAR adopted in the specific embodiment of the present invention is as follows figure 1 shown, where:

[0083] The center point of the scene area is A(x 0 ,y 0 ,0), T and R denote the transmitting platform...

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Abstract

The invention provides an NLCS imaging method of a curvilinear motion bistatic SAR for special scene requirements such as multi-angle target observation. The method comprises the steps that firstly, a Chebyshev polynomial is used for decomposing a slope distance function under the three-dimensional speed and acceleration, and the purpose is to improve the approximation precision of the slope distance function; a linear range walk item is compensated through LRCMC, so that large strabismus is equivalent to small strabismus or front side view imaging, and the processing process of a later algorithm is simplified; aiming at the problem of azimuth time space-variant caused by three-dimensional speed and acceleration, an azimuth nonlinear scaling algorithm is provided, Doppler frequency modulation rates of different point targets are balanced by using a disturbance function, and azimuth filtering of the same distance unit can be carried out under the same parameter, so that the problem of space-variant of the Doppler frequency modulation rates along with azimuth is solved, and the focusing depth and the imaging resolution of the point target are effectively improved.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to an NLCS imaging method of a curved-motion double-base SAR in synthetic aperture radar imaging technology. Background technique [0002] Bistatic Synthetic Aperture Radar (BiSAR) refers to a radar imaging system in which the transmitting platform and receiving platform work separately. Compared with the traditional single-base SAR, it has greater flexibility in use, a longer range of action, and can obtain more abundant information. But at the same time, the separate structure of the transceiver platform also brings some technical challenges. The slope range function of bistatic SAR is the sum of two hyperbolas, which makes the solution of the spectrum function more difficult and increases the complexity of the imaging algorithm. [0003] For special scenarios such as multi-angle observation targets in practical application scenarios, the carrier platform of the...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9019G01S13/9011G01S13/9017G01S13/9058
Inventor 谭鸽伟李梦慧杨晶晶徐熙毅李彪
Owner HUAQIAO UNIVERSITY
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