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A synthetic aperture radar azimuth signal reconstruction method and device

A synthetic aperture radar and azimuth signal technology, which is applied in measuring devices, instruments, and using re-radiation, can solve the problems of loss of signal-to-noise ratio, failure, etc., and achieve the effects of improving SNR, improving quality, and improving azimuth ambiguity

Active Publication Date: 2020-01-21
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At present, the classic azimuth signal reconstruction algorithm is based on the inversion of the channel transfer function matrix. This method can effectively complete the reconstruction of the azimuth signal when the non-uniform sampling is not serious, but in the case of severe non-uniform sampling, it will be serious. loss of signal-to-noise ratio, or even complete failure in the presence of data redundancy

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  • A synthetic aperture radar azimuth signal reconstruction method and device
  • A synthetic aperture radar azimuth signal reconstruction method and device
  • A synthetic aperture radar azimuth signal reconstruction method and device

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[0053]In the embodiment of the present invention, according to the first channel transfer function matrix, the SNR amplification factor of the first channel transfer function matrix is ​​determined, and the equivalent Doppler bandwidth is determined according to the SNR amplification factor; according to the equivalent Doppler bandwidth and The first channel transfer function matrix determines the second channel transfer function matrix corresponding to each Doppler frequency point; according to the second channel transfer function matrix corresponding to each Doppler frequency point, and the pre-measured aliasing spectrum and The original spectrum corresponding to the aliased spectrum determines a spectrum filter for extracting the Doppler spectrum, and the spectrum filter is used for extracting the Doppler spectrum in the azimuth signal.

[0054] Below in conjunction with embodiment the present invention is described in further detail.

[0055] The synthetic aperture radar a...

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Abstract

An azimuth signal reconstruction method for a Synthetic Aperture Radar (SAR) is provided. A first Signal Noise Ratio (SNR) amplification factor of a first channel transfer function matrix is determined according to the first channel transfer function matrix, and an equivalent doppler bandwidth is determined according to the SNR amplification factor; a second channel transfer function matrix corresponding to each doppler frequency point is determined according to the equivalent doppler bandwidth and the first channel transfer function matrix; and a spectrum filter for extracting a doppler spectrum is determined according to the second channel transfer function matrix corresponding to each doppler frequency point, a premeasured aliasing spectrum and an original spectrum corresponding to the aliasing spectrum, the spectrum filter being configured to extract the doppler spectrum in an azimuth signal. An azimuth signal reconstruction device for the SAR is further provided.

Description

technical field [0001] The present invention relates to a Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) technology, in particular to a SAR azimuth signal reconstruction method and device. Background technique [0002] Multi-channel technology has very important applications in technologies such as spaceborne SAR high-resolution wide swath imaging, interference imaging and moving target detection. SAR azimuth signal reconstruction technology is one of the key technologies of multi-channel technology. Considering non-uniform sampling The azimuth signal reconstruction method in this case is of great significance to SAR imaging. [0003] At present, the classic azimuth signal reconstruction algorithm is based on the inversion of the channel transfer function matrix. This method can effectively complete the reconstruction of the azimuth signal when the non-uniform sampling is not serious, but in the case of severe non-uniform sampling, it will be serious. loss of sign...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9011G01S7/40G01S13/904
Inventor 刘娜王宇邓云凯赵硕王翔宇
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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