Polarization sensitive array based non-circular signal DOA and polarization parameter joint estimation method

Abstract

The invention belongs to the technical field of array signal direction finding and particularly relates to a polarization sensitive array based non-circular signal DOA and polarization parameter joint estimation method. Compared with most of methods in the field, the polarization sensitive array based non-circular signal DOA and polarization parameter joint estimation method can be used for the more general situation that circular signals and non-circular signals are mixed. By establishing a planar dual-polarization sensitive array based long vector receive data model and utilizing the non-circular characteristic of the signals, the circular signals and the non-circular signals in mixed incidence signal are separated to be sequentially estimated, mutual interference of two types of signals is reduced, and accordingly the performance of estimating various signals is improved. In addition, the four-dimensional searching process of a spectral function is reduced to be two-dimensional searching process for solving the problem of huge operation amount, the operation times of the method are decreased, and the estimating accuracy is not reduced. The polarization sensitive array based non-circular signal DOA and polarization parameter joint estimation method successively fills up the blank of polarization sensitive array based methods for non-circular signal direction finding.

Description

technical field [0001] The invention belongs to the technical field of array signal direction finding, and in particular relates to a joint estimation method of non-circular signal DOA and polarization parameters under a polarization-sensitive array, which is based on a planar dual-polarization sensitive array and is suitable for mixing circular signals and non-circular signals. A method for joint estimation of DOA and polarization parameters in the incident case. Background technique [0002] In the estimation of the signal direction of arrival (DOA), if some characteristic information of the incoming signal can be reasonably used, such as the non-circular characteristics of the signal, polarization characteristics, etc., these additional The information improves the estimation performance of the algorithm. [0003] The non-circular characteristic of the signal means that the statistical characteristics of the signal do not have rotation invariance. In the array signal pro...

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Problems solved by technology

[0005] The classic DOA estimation method based on the electromagnetic vector sensor array uses a long vector (long vector, LV) data model. When the polarization parameters are unknown, the high-dimensional search of the LV data model will lead to a huge amount of computation, which is difficult to apply in engineering applications. accomplish

[0006] At present, the joint estimation method of DOA and polarization parameters using both the non-circular and polarization characteristics of the signal is still a blank

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