A channel compression synthetic aperture radiometer imaging method and system
A technology of comprehensive aperture and imaging method, applied in the direction of utilizing re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc. The effect of low hardware complexity and low cost
Active Publication Date: 2021-07-02
HUAZHONG UNIV OF SCI & TECH
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[0004] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problems of high complexity, large volume and high cost of the traditional synthetic aperture AS system hardware system
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[0053] 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 the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0054] Aiming at the disadvantages of traditional synthetic aperture (Aperture Synthesis, AS) system hardware system with high complexity, large volume and high cost, the present invention proposes a new synthetic aperture imaging method and system that reduces the number of receiver channels, called compressed channel synthetic aperture (AS) Channel Compressive Aperture Synthesis, CCAS). Its p...
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The invention discloses a channel compression synthetic aperture radiometer imaging method and system, including S1: using an antenna array composed of N channels and M antennas to perform one-to-many or many-to-many network connections; S2: performing channel output signals Correlate to obtain the measurement correlation matrix, and establish the relationship between the measurement correlation matrix and the redundant average visibility function according to the antenna array structure and connection network; S3: If a single measurement correlation matrix cannot solve the redundant average visibility function, use a different connection The network measures the same radiation scene multiple times to obtain multiple sets of measurement correlation matrices; S4: Use step S3 to measure the correlation matrix, use the regularization method to obtain the redundant average visibility function, and finally use the inverse Fourier transform to solve the brightness temperature distribution of the radiation field . Compared with the existing traditional synthetic aperture, the network connection method provided by the invention not only has almost the same imaging performance, but also can effectively reduce receiver channels and correlators.
Description
technical field [0001] The invention relates to the technical field of microwave remote sensing and detection, and more specifically, to a channel compression synthetic aperture radiometer imaging method and system. Background technique [0002] Synthetic aperture technology has been proved to be a high-resolution passive imaging method, which has been widely used in the fields of radio astronomy and earth remote sensing, and has also been used in target detection in recent years. This technology uses sparsely distributed small-aperture antennas to form a large-scale array, and obtains the frequency component of the Fourier transform of the radiation field brightness temperature image by pairwise correlation, also known as the visibility function, and then reconstructs the radiation brightness temperature of the scene according to the visibility function image. With the development of this technology, many microwave synthetic aperture radiometers (Aperture Synthetic, AS) ha...
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IPC IPC(8): G01S13/90G01S7/03
CPCG01S7/03G01S13/9094G01S13/90
Inventor 胡飞郑涛雷贤
Owner HUAZHONG UNIV OF SCI & TECH