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Chebyshev slant distance model of curvilinear motion trail SAR and Chirp Scaling imaging method

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: 2020-05-29
HUAQIAO UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a Chebyshev slant distance model and Chirp Scaling imaging method of a curved motion trajectory SAR to solve the imaging accuracy problem of the scene target in the curved motion mode

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  • Chebyshev slant distance model of curvilinear motion trail SAR and Chirp Scaling imaging method
  • Chebyshev slant distance model of curvilinear motion trail SAR and Chirp Scaling imaging method
  • Chebyshev slant distance model of curvilinear motion trail SAR and Chirp Scaling imaging method

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[0060] The present invention will be further described below through specific embodiments.

[0061] The technical solution will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0062] see figure 1 Shown, the Chebyshev slant distance model and ChirpScaling imaging method of a kind of curved trajectory SAR of the present invention comprise the following steps:

[0063] S101, the geometric model of the airborne SAR system with curved trajectory is as follows figure 2 As shown, the SAR carrier at the point C(0, 0, H) at the initial moment is at the initial velocity (V x , V y , V z ), acceleration (a x , a y , a z ) flies along the Y axis, t a Time to reach D(x d ,y d ,z d )point. Assume that the point target P coordinate in the observation scene is (x 0 ,y 0 ,0). According to the equation of motion, the...

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Abstract

The invention discloses a Chebyshev slant distance model of a curvilinear motion trail SAR and a Chirp Scaling imaging method. The method comprises steps of building a slant distance expression in a curvilinear motion trail mode according to a geometric model and a motion equation of an SAR system; utilizing a Chebyshev polynomial to carry out four-order approximation of a slant range expression;deducing an equivalent hyperbolic slant distance equation under a front side view; converting an SAR echo signal corresponding to the slant range equation into a distance frequency domain to perform distance walk correction, converting the corrected distance frequency domain signal into a distance Doppler domain, and constructing a Chirp Scaling function to perform CS processing so as to adjust the distance migration curvature of different slant ranges; transforming to a two-dimensional frequency domain, and carrying out range migration correction, range compression and secondary range compression; converting to a distance Doppler domain, and performing azimuth compression and residual phase compensation; and lastly, converting to a two-dimensional time domain to obtain a focusing signal.The method is advantaged in that an imaging problem of the curvilinear motion trail SAR can be solved, and imaging performance of the curvilinear motion trail SAR is improved.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and more specifically relates to a Chebyshev slant-range model and a Chirp Scaling imaging method of a curved trajectory SAR. Background technique [0002] Synthetic aperture radar (SAR) can conduct all-day observations of the region and is not subject to climate constraints. It has been widely used in military and civilian fields. In some special application backgrounds, such as small aircraft, unmanned aerial vehicles and missiles, due to the existence of acceleration, the motion characteristics of SAR carriers are more complex and present a curved trajectory. At this time, the traditional processing method based on the linear trajectory is invalid. The traditional hyperbolic equation cannot accurately describe the slant-range history of SAR with curved trajectory, so a new slant-range model and imaging method must be established. [0003] Hu Cheng, An Hongyang, Liu Junbi, Li Zhenyu, e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9011G01S7/41
Inventor 谭鸽伟孟亭亭潘光武吕蓬李梦慧杨晶晶
Owner HUAQIAO UNIVERSITY
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