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Azimuthal multi-channel FMCW SAR sliding bunching imaging method

A technology of sliding beamforming and imaging methods, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., and can solve the problem of low imaging quality

Active Publication Date: 2017-07-07
王辉
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Problems solved by technology

[0006] The problem solved by the present invention is that the imaging quality of the existing spaceborne FMCW SAR system is low; in order to solve the problem, the present invention provides an azimuth multi-channel FMCW SAR sliding spotlight imaging method

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  • Azimuthal multi-channel FMCW SAR sliding bunching imaging method

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Embodiment Construction

[0031] Hereinafter, the spirit and essence of the present invention will be further elaborated in conjunction with the drawings and embodiments.

[0032] Such as figure 1 As shown, the azimuth multi-channel FMCW SAR sliding spotlight imaging method provided by the present invention comprises:

[0033] Step 1, using one channel to transmit an FM continuous wave signal, receiving M channels simultaneously in the azimuth direction, where M is an arbitrary integer, and obtaining an FM continuous wave sliding spotlight SAR echo signal under-sampled by the M channels in the azimuth direction;

[0034] The obtained M-channel azimuth subsampled FM continuous wave sliding spotlight SAR echo signal can be expressed as:

[0035]

[0036] Where t is the distance fast time, η is the azimuth time, T spot is the synthetic aperture time, η start is the starting time of observation, η end is the end time of the observation, f c is the center frequency of the transmitted signal, K r is...

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Abstract

The invention discloses an azimuthal multi-channel FMCW SAR sliding bunching imaging method. The method comprises: frequency-modulation continuous wave signals are emitted by a channel and the frequency-modulation continuous wave signals are received simultaneously by azimuthal M channels to obtain-path azimuthal under-sampling frequency-modulation continuous wave sliding bunching SAR echo signals; a Deramping operation is carried out on each path of echo data at an azimuth to eliminate a change of a Doppler center with time; azimuth reconstruction is carried out on the M-path echo data after the Deramping operation to obtain one path of echo data; frequency domain zero filling and Ramping operation are carried out on the echo data after azimuth reconstruction to obtain a non-aliasing scene echo signal; and imaging processing is carried out on the obtained non-aliasing scene echo signal to obtain a focused SAR image.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar imaging, and in particular relates to an azimuth multi-channel FMCW SAR sliding spotlight imaging method. Background technique [0002] Synthetic aperture radar is a kind of active microwave remote sensing equipment, which can realize earth observation all-weather and all-weather, and plays an important role in many fields of national economy and military application. [0003] Due to its small size, light weight, high resolution and low cost, FMCW SAR is favored in military and civilian fields, and countries all over the world have started the development of FMCW SAR systems. Multiple sets of airborne FMCW SAR systems have been successfully developed and tested. In 2009, the Netherlands Delft University of Technology (TU Delft), TNO (Netherlands National Institute of Applied Sciences), SSBV and other units took the lead in proposing the spaceborne FMCW SAR system Panel SAR. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9052
Inventor 王辉郑世超姜漫孙志强谢少彪
Owner 王辉
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