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Antenna array augmented covariance matrix-based radio frequency interference source positioning method

A technology of covariance matrix and antenna array, applied in the field of microwave remote sensing, can solve the problems of poor RFI positioning performance

Active Publication Date: 2017-09-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, due to the constraints of the sparse arrangement of the array, the spatial spectrum estimation method is directly applied to the synthetic aperture radiometer, and its RFI positioning performance is still poor

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  • Antenna array augmented covariance matrix-based radio frequency interference source positioning method

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Embodiment Construction

[0048] 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.

[0049] In the radio frequency interference source location method based on the antenna array augmented covariance matrix provided by the embodiment of the present invention, the process of constructing the augmented covariance matrix construction method is as follows figure 1 shown, including the following steps:

[0050] (1) Construct a virtual filling antenna array B based on the MIRAS antenn...

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Abstract

The invention discloses an antenna array augmented covariance matrix-based radio frequency interference source positioning method. The method comprises the following steps that: (1) a virtual filling antenna array is constructed according to the UV distribution of an antenna array; (2) visibility assignment is performed on the virtual filling antenna array according to the visibility function of the antenna array, so that visibilities corresponding to the UV points of the antenna pairs of the virtual filling antenna array are obtained; (3) an augmented covariance matrix is constructed according to the visibilities corresponding to the UV points of the antenna pairs of the virtual filling antenna array; and (4) on the basis of the constructed augmented covariance matrix, a spatial spectrum estimation method is used to position of a radio frequency interference source. The antenna array augmented covariance matrix-based radio frequency interference source positioning method of the invention is greatly improved in distinguishing the number of radio frequency interference sources and distinguishing the clarity degrees of the radio frequency interference sources compared with Fourier transform algorithm-based radio frequency interference source positioning performance and direct covariance matrix-based radio frequency interference source positioning performance. The augmented covariance matrix constructed by the method can significantly improve the quality of a brightness temperature image.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing, and more specifically relates to a radio frequency interference source positioning method based on an antenna array augmented covariance matrix. Background technique [0002] Synthetic aperture technology has been widely used in the fields of radio astronomy and earth remote sensing. This technology uses sparsely distributed small-aperture antenna arrays to obtain the spatial frequency information of the brightness temperature image of the radiation field through the correlation averaging method of each pair of antennas, and then reconstructs the brightness temperature image of the radiation field according to the spatial frequency information. However, when the brightness temperature of a certain point in the radiation field is much higher than that of its nearby points, due to the limited spatial frequency region sampled by the antenna array, the brightness temperature image re...

Claims

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Application Information

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IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 贺锋胡飞李军冯驰茗
Owner HUAZHONG UNIV OF SCI & TECH
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