Partial polarization signal multi-parameter estimation method based on non-co-located non-uniform polarization array

Abstract

The invention discloses a partially polarized signal multi-parameter estimation method based on a non-co-located non-uniform polarized array. The method comprises the following steps of: arranging a non-co-located non-uniform polarization array; constructing a partially polarized signal receiving model and sampling; solving an array sample covariance matrix and error statistical distribution of the array sample covariance matrix; constructing an optimization problem used for reconstructing a co-located uniform polarization array theoretical covariance matrix and solving the optimization problem; estimating a signal incoming wave direction based on a reconstructed co-located uniform polarization array theory covariance matrix; and solving a signal coherence matrix and estimating a signal polarization parameter. According to the method, the array adopts a non-co-location mode, and the phase centers of the polarization units are not overlapped, so that on one hand, the problem of mutual coupling between co-location array polarization units is avoided; and on the other hand, each array element only has one radio frequency channel, so that resources are saved. Then, the array adopts a non-uniform mode, so that the limitation of a uniform array on the aperture of the array is eliminated, and the estimation of the direction of arrival is ensured not to be fuzzy;

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and in particular relates to multi-parameter estimation of partial polarization signals, in particular to a multi-parameter estimation method of partial polarization signals based on non-colocated non-uniform polarization arrays. Background technique [0002] Array antenna technology is used to estimate signal direction of arrival and other parameters, and is widely used in radar, communication and other technical fields. Previous studies mostly assumed that the array is a scalar array, that is, the polarization of the array is single. In this case, when the signal polarization differs from the array polarization, a polarization mismatch will result, reducing the signal-to-noise ratio. To solve this problem, polarimetric arrays (full name polarimetric sensitive arrays) are proposed. The polarized array contains elements of different polarizations, which can receive different pol...

AI Technical Summary

Problems solved by technology

However, due to the uniform structure of the array, in order to avoid the ambiguity of the incoming wave direction, the distance between different polarized elements needs to be no more than a quarter wavelength, which will reduce the array aperture and increase the mutual coupling.

In addition, the parameter estimation method proposed in this paper is for the case where the signal is fully polarized, and is not suitable for partially polarized signals

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