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InISAR imaging method based on double-frequency conjugation processing

An imaging method and conjugate technology, which is applied in the field of radar imaging and radar signal processing, can solve the problems of immobile target positioning, etc., and achieve the effect of avoiding interference phase unwrapping and realizing azimuth positioning

Inactive Publication Date: 2014-05-07
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

[0012] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide an InISAR imaging method based on dual-frequency conjugate processing, this method solves the problem that the existing moving target imaging method cannot locate the moving target, and optimizes the existing A method for estimating the size of a moving target, realizing target attitude determination on the basis of positioning, and expanding the application of dual-frequency conjugate processing technology in interference

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Embodiment Construction

[0037] The specific embodiment of the present invention will be further described in detail below in conjunction with the specific examples of the accompanying drawings and simulation experiments.

[0038] like figure 1 As shown, the specific steps of a kind of InISAR imaging method based on dual-frequency conjugate processing of the present invention are as follows:

[0039] Step S1: Perform Fourier transform of the moving target echo signal of an antenna channel on the fast time, convert the full-time domain signal into the slow time-fast frequency domain, and perform equal division in the fast frequency domain, and divide it into two sub-bands linearly FM signal;

[0040] Step S2: Perform range pulse compression on the two sub-band chirp signals in step S1, and then perform dual-frequency conjugation processing to obtain a composite signal. signal conjugate multiplication;

[0041] Step S3: Using the ISAR imaging method to perform imaging processing on the synthesized si...

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Abstract

The invention provides an InISAR imaging method based on double-frequency conjugation processing and discloses a method in which the double-frequency conjugation processing technique is combined with the interferometric technique to be applied to ISAR so as to achieve moving object positioning and imaging. The method comprises the steps of conducting sub-band segmentation, conducting sub-band pulse compression and double-frequency conjugation processing, conducting rough interferometric measurement on a target with composite signals, conducting original signal imaging and interferometric processing, and achieving target scattering point accurate measurement through the combination of the interference result of an original signal image and the result of rough interferometric measurement to further achieve target positioning and imaging. The method mainly solves the problem of target Doppler frequency blurring and target interferometric measurement blurring in an InISAR mode and can achieve target positioning and imaging at the same time.

Description

technical field [0001] The invention relates to an InISAR (Interfemetric Inverse Synthetic Aperture Radar) imaging method based on dual-frequency conjugate processing, which is used to obtain the real geometric size and real spatial position of a target, and belongs to the technical field of radar imaging and radar signal processing. Background technique [0002] Inverse Synthetic Aperture Radar (Inverse Synthetic Aperture Radar, ISAR) obtains range resolution by transmitting broadband signals, uses the relative motion between the radar and the target to form a synthetic aperture, and obtains Doppler dimension resolution through signal processing technology to obtain the target image. ISAR is the main radar system for imaging moving targets. Since its birth, people have realized that ISAR imaging has important application value in astronomical observation, tactical weapons, and strategic defense. [0003] With the continuous growth of application requirements, the defects o...

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Application Information

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IPC IPC(8): G01S7/41G01S13/50G01S13/58G01S13/90
CPCG01S13/583G01S13/9023G01S13/9029G01S13/9064
Inventor 刘波尹建凤林晴晴万晓云王伟宗
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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