Sum-difference tracking angle measurement method based on Nested array

Abstract

The invention belongs to the field of radar signal processing, and discloses a sum-difference tracking angle measurement method based on a Nested array. The method comprises the steps: obtaining the echo data of the Nested array, carrying out the vectorization of a covariance matrix of the echo data, and forming single-snapshot receiving data; removing the redundancy of the single-snapshot receiving data, and obtaining the single-snapshot receiving data of a virtual array; carrying out the reconstruction of data; enabling the reconstruction data to serve as the covariance matrix of the echo data of the virtual array when the data contains interference data, and calculating a sum wave beam weight value and a different wave beam weight value after interference resistance; carrying out the data interpolation of the echo data of the Nested array, and forming the echo data of the virtual array; obtaining a sum wave beam and a difference wave beam after interference resistance, and carrying out the sum-different tracking angle measurement; enabling the reconstruction data to serve as the multi-snapshot receiving data of the virtual array when the interference data is not contained, obtaining the sum wave beam and the difference wave beam, and carrying out the sum-different tracking angle measurement according to the sum wave form and the difference wave beam, thereby achieving the accurate sum-difference tracking.

Description

technical field [0001] The present invention relates to the field of radar signal processing, in particular to a method of sum-difference tracking angle measurement based on Nested array, which can perform sum-difference tracking even when there is interference, and the degree of freedom of anti-interference is greater than the number of array elements of Nested array . Background technique [0002] Direction of arrival (DOA) estimation using array is a key technique in array signal processing. However, when DOA is estimated on the traditional uniform linear array (uniform linear array, ULA), the degree of freedom will be limited by the array aperture. For this reason, Pal Piya, Vaidyanathan P P proposed Nested Arrays, and proposed "A Novel Approach to Array Processing with Enhanced Degrees of Freedom" algorithm (IEEE Trans on Signal Processing, 2010, 58(8): 4167-4181), the Khatri-Rao operation is performed on the Nested array, which can be compared with the same physical ...

AI Technical Summary

Problems solved by technology

At present, large-scale phased array radars use the sum-difference tracking method to track targets, but using the existing algorithms cannot increase the degree of freedom of the array's anti-jamming, and the formation is required to be uniform when sum-difference tracking and direction finding Linear array, uniform area array, uniform circular array, or conformal array

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