Multi-channel satellite-borne SAR phase equalization method and device, storage medium and equipment
A phase equalization and multi-channel technology, applied in the field of signal processing, can solve problems such as inability to reconstruct spaceborne SAR signals, image false targets, and affect image quality
Active Publication Date: 2019-10-29
BEIHANG UNIV
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Problems solved by technology
Due to environmental, technological and other reasons, there will be amplitude and phase errors between different channels of the satellite during space flight. When there are channel amplitude and phase errors, the spaceborne SAR signal will not be able to reconstruct the ideal azimuth spectrum, which will affect the imaging quality, and even False targets appear in the image
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[0124] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.
[0125] figure 1 It is a flow chart of a multi-channel spaceborne SAR phase equalization method shown according to an exemplary embodiment, such as figure 1 As shown, the method includes the following steps:
[0126] Step 101: Determine the echo data of the i-th channel and the echo data of the i+1-th channel according to the pre-acquired antenna and system parameters.
[0127] Among them, the i+1th channel is the adjacent channel of the ith channel, and the pre-acquired antenna and system parameters include: pulse repetition frequency, expressed as PRF, satellite velocity, expressed as V, Doppler center frequency, expressed as f d , the number of receiving...
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The invention relates to a multichannel satellite-borne SAR (Synthetic Aperture Radar) phase equalization method and device, and the method comprises the following steps: determining echo data of an ith channel and the echo data of an (i + 1) th channel according to pre-obtained antenna and system parameters; according to the echo data of the ith channel and the echo data of the (i + 1) th channel, determining feature vectors of a covariance matrix of the ith channel and the (i + 1) th channel by utilizing fast Fourier transform; determining a first phase error according to the feature vectorin combination with optimization of a minimum distance value between a rotation factor and a spatial steering factor; enabling i to be equal to i + 1, and repeating the first phase error determinationstep until K-1 phase errors needing to be compensated between all K receiving channels contained in the antenna and system parameters are determined; and finally performing phase error compensation on the K receiving channels according to the K-1 phase errors. The phase error between the channels can be accurately compensated, the occurrence of paired echoes is effectively inhibited, and the image quality is improved.
Description
technical field [0001] The present disclosure relates to the technical field of signal processing, and in particular, to a multi-channel spaceborne SAR phase equalization method, device, storage medium and equipment. Background technique [0002] Spaceborne synthetic aperture radar (English: Synthetic Aperture Radar; abbreviation: SAR) is a kind of microwave active imaging radar. Since it is not affected by weather and climate, it can observe the earth all-weather and all-weather. In the existing technology, aiming at the contradiction between high resolution and wide swath in the traditional single-channel spaceborne SAR system, applying multi-channel technology to the spaceborne SAR system can effectively solve this contradiction, but the multi-channel spaceborne SAR Technology also puts higher demands on the system and imaging processing. Due to environmental, technological and other reasons, there will be amplitude and phase errors between different channels of the sate...
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Login to View More IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor陈杰高贺利匡辉杨威李春升
OwnerBEIHANG UNIV