Method for estimating DOA (direction of arrival) of non-circular signal based on polynomial solving

Abstract

The invention discloses a method for estimating the DOA (direction of arrival) of a non-circular signal based on polynomial solving, and mainly solves problems that the array elements are low in utilization rate and the signal recognition number is small in the prior art. The method comprises the implementation steps: 1), obtaining an output signal of a nested array, calculating a covariance matrix and an elliptical covariance matrix according to the signal, constructing an equivalent covariance vector and an equivalent elliptical covariance vector, and calculating the dimensions of all elements in the two vectors; 2), calculating a virtual array covariance vector and a virtual array elliptical covariance vector, constructing two DOA selection matrixes, and calculating the noise subspaces; 3), obtaining a first noise matrix, a second noise matrix, a third noise matrix and a fourth noise matrix through the noise subspaces, and constructing a polynomial equation according to the two noise matrixes; 4), calculating the roots of the polynomial equation, and obtaining a target DOA value. According to the invention, the method greatly increases the number of array recognizable signal sources under the non-circular signal environment, and can be used for target detection and passive positioning.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method for estimating the direction of arrival angle of array signals of electromagnetic signals, which can be used for reconnaissance and passive positioning of moving targets of aircraft and ships. Background technique [0002] Signal DOA estimation is an important branch in the field of array signal processing. It refers to the use of antenna arrays to inductively receive spatial acoustic signals and electromagnetic signals, and then use modern signal processing methods to quickly and accurately estimate the direction of the signal source. , has important application value in radar, sonar, wireless communication and other fields. [0003] In modern communication, there are more and more applications of non-circular signals such as binary phase shift keying and M-ary amplitude shift keying, so the DOA estimation of non-circular signals has received more and more att...

AI Technical Summary

Problems solved by technology

This method has the ability to estimate the number of signals more than the number of array elements. However, the discussion of this array is focused on the condition that the received signal is a circular signal, and there is no research on how to use this array to process non-circular signals.

[0005] In practical applications, with a non-circular signal environment, given a certain number of array elements, if these array elements and the non-circular characteristics of the signal cannot be rationally utilized, enough signals cannot be estimated, resulting in a waste of reconnaissance and positioning resources

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