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Onboard SAL imaging method adopting along-track interference to inhibit platform vibration

An imaging method and platform technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc., can solve the problems of airborne SAL imaging effects, and achieve the effect of reducing constraints

Active Publication Date: 2014-04-16
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The technical problem to be solved in the present invention is mainly: to solve the problem that the airborne SAL obtains high-resolution images in the azimuth direction under the condition of being affected by vibration. Implications of SAL Imaging

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  • Onboard SAL imaging method adopting along-track interference to inhibit platform vibration

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0021] The present invention provides an airborne SAL imaging method that uses along-track interference processing to suppress platform vibration, which mainly includes: echo signal preprocessing, dividing slow-time sub-apertures and performing sub-aperture imaging; performing interference processing on sub-aperture images, Extract the interferometric phase to estimate the instantaneous velocity of the platform vibration; calculate the phase error caused by the vibration, and perform rough compensation for the phase error; perform PGA processing on the phase-compensated data to obtain the final imaging result. Based on the along-track multi-detector observation structure, the airborne SAL vibration suppression and imaging ...

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Abstract

The invention discloses an onboard SAL imaging method adopting along-track interference to inhibit the platform vibration. The method comprises the steps: pre-processing an echo signal, dividing a slow time subaperture and imaging the subaperture; processing an image of the subaperture by means of the interference, extracting an interferometric phase, and estimating the instantaneous speed of a platform in vibration; calculating a phase error caused by the vibration, and performing coarse compensation on the phase error; processing the phase-compensated data by means of PGA (Programmable Gain Amplifier) treatment to obtain a final imaging result. Based on an along-track multi-detector observing structure, the onboard SAL vibration inhibition and imaging method can effectively inhibit influences caused by the platform vibration, and realizes the high-resolution imaging of an onboard SAL azimuth.

Description

technical field [0001] The invention belongs to the field of synthetic aperture lidar (Synthetic Aperture Ladar, SAL) imaging, and specifically relates to airborne SAL imaging processing under vibration conditions, in particular to an imaging method that uses along-track interference processing to suppress platform vibration. Background technique [0002] SAL is an analogy of microwave Synthetic Aperture Radar (SAR) technology in the optical band. It provides the possibility for LiDAR to achieve long-distance high-resolution imaging, and has good military and civilian potential. [0003] Airborne SAL works in the optical band. Since the optical wavelength is 3 or 4 orders of magnitude smaller than microwave, airborne SAL can theoretically achieve the same high image resolution with a shorter synthetic aperture time than SAR. But correspondingly, the slight vibration of the platform will cause significant changes in the signal phase, which brings many difficulties to the airb...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/38
CPCG01S7/36G01S13/9023G01S13/9029
Inventor 李道京马萌杜剑波
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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