Coprime array DOA estimation method based on quantum penguin search mechanism in strong impact noise environment

Abstract

The invention discloses a coprime array DOA estimation method based on a quantum penguin search mechanism under strong impact noise. The method comprises the following steps: obtaining a fractional low-order covariance matrix of an infinite norm weighted signal; constructing an extended fractional low-order covariance matrix and an extended guide matrix, and constructing a maximum likelihood direction finding equation based on the extended covariance matrix; initializing a quantum penguin group, and initializing the speed and the quantum position of the quantum penguin; calculating fitness andcarrying out descending sort, and selecting a global optimal quantum position; updating the quantum position of the quantum penguin; evaluating a quantum penguin position fitness value, and updatinga global optimal quantum position; judging whether the maximum number of iterations is reached or not, and if not, continuing iteration; and if so, outputting a global optimal quantum position, and mapping to obtain an optimal DOA estimation value. According to the invention, higher direction finding precision, higher operation speed, better array aperture expansion capability, coherent source measurement capability, impact noise resistance and wider application environment are realized.

Description

technical field [0001] The invention relates to a method for estimating DOA of a coprime array based on a quantum penguin search mechanism under strong impact noise, and belongs to the field of array signal processing. Background technique [0002] Direction of Arrival (DOA) estimation, also known as direction of arrival (DOA), has always been a hot research topic in the field of array signal processing, and has been widely used in communication, radar and sonar systems. Coprime array is a new type of array structure proposed in recent years to improve the degree of freedom of the array. It has been widely studied and concerned by scholars because of its ability to expand the array aperture. The coprime array is a non-uniform linear array obtained by placing two uniform linear arrays overlapping at the starting point. While expanding the array aperture, it well solves the influence of mutual coupling between array antennas and better improves the The direction of arrival es...

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Problems solved by technology

[0003] According to the findings of the existing technical literature, Zhang Hao et al. published in "Journal of Detection and Control" (2018, Vol.40, No.5, pp.1008-1194) "Coprime array DOA estimation based on covariance matrix A DOA estimation method that fills the cavity of the difference joint array of the coprime array is proposed in "Method", which increases the number of estimable signals and improves the estimation performance, but it cannot perform direction finding in the impact noise environment, nor can it measure The direction of arrival of the coherent source

Huang Lei et al. proposed a new fractional low-order algorithm in "Fast DOA Estimation in Impulse Noise Environment" published in "Journal of Harbin Engineering University" (2008, Vol.29, No.6, pp.1006-7043) , using fractional low-order moment data to directly construct and update the signal subspace, which reduces the amount of calculation to a certain extent, but the estimation accuracy is not high, and the array aperture cannot be expanded, and the incoming wave direction of the coherent signal source cannot be measured

[0004] In summary, although the above DOA estimation methods have achieved certain results, they cannot achieve high-precision direction finding in the environment of strong impact noise, low signal-to-noise ratio, small number of snapshots, and multi-coherent sources.

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