Bistatic foresight SAR frequency domain imaging method based on frequency spectrum optimization modeling

An imaging method and bistatic technology, applied in the field of radar, can solve the problem that bistatic forward looking SAR cannot deal with nonlinear space variation in range direction and so on

Active Publication Date: 2016-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing imaging algorithm cannot deal with the non-linear space variation of bistatic forward-looking SAR range, and to provide an accurate two-dimensional spectrum of bistatic forward-looking SAR through differential evolution optimization method. Responding to the precise two-dimensional spectrum, the echo signal is imaged in the two-dimensional frequency domain, which can realize the precise focusing of the bistatic forward-looking SAR raw data. The bistatic forward-looking SAR frequency-domain imaging method based on spectrum optimization modeling

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  • Bistatic foresight SAR frequency domain imaging method based on frequency spectrum optimization modeling

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[0085] The present invention mainly adopts the method of computer simulation to verify, and all steps and conclusions are verified correctly on MATLAB2013. The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0086] Such as figure 1 As shown, the bistatic forward-looking SAR frequency-domain imaging method based on spectrum optimization modeling includes the following steps:

[0087] S1. Perform data preprocessing to obtain echo signals; specifically, the following sub-steps are included:

[0088] S11. Initialize the imaging system parameters; the set structure of the bistatic forward-looking SAR adopted in this embodiment is as follows figure 2 shown. Its parameters are shown in Table 1. The target scenario used in this embodiment is as follows image 3 As shown, the black dots in the figure are 5 point targets arranged on the ground. These 5 points are distributed on t...

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Abstract

The present invention discloses a bistatic foresight SAR frequency domain imaging method based on frequency spectrum optimization modeling. The method comprises the following steps: S1, performing data preprocessing, and obtaining echo signals; S2, performing two-dimensional Fourier transform of the echo signals, establishing the point target response optimal two-dimensional frequency spectrum mode of the system, and solving the point target response two-dimensional frequency spectrum through adoption of a difference evolution optimization method; S3, performing rough matching focusing of the point target response accurate two-dimensional frequency spectrum; S4, performing distance frequency transformation of the two-dimensional frequency spectrum; and S5, performing two-dimensional inverse Fourier transform of the two-dimensional frequency spectrum after the distance frequency transformation, and obtaining final complex images. The problem is overcome that the current imaging algorithm cannot process the space variation of the bistatic foresight SAR distance to the nonlinearity, an accurate bistatic foresight SAR two-dimensional frequency spectrum is obtained through the difference evolution optimization method, and the echo signals are subjected to imaging process on the two-dimensional frequency domain according to the point target response accurate two-dimensional frequency spectrum to realize the accurate focusing of the bistatic foresight SAR original data.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a bistatic forward-looking SAR frequency-domain imaging method based on spectrum optimization modeling. Background technique [0002] Bistatic forward-looking SAR imaging is a new concept and new system SAR technology with important military applications and civilian values. station, the transceiver beam points to the area directly in front of the aircraft where the receiving station is located, and utilizes the collaboration between the transceiver stations to achieve high-resolution radar imaging directly in front of the aircraft through imaging processing. Its application background is extensive, including autonomous landing, autonomous navigation, material and personnel airdrop, forward-looking reconnaissance, scene matching terminal guidance, etc. [0003] Similar to monostatic SAR, bistatic SAR can perform imaging processing in the azimuth frequency domain to speed up its pr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9043G01S13/9058
Inventor 武俊杰蒲巍孙稚超任建宇黄钰林杨建宇杨海光
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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