Parameter estimation method based on virtual concentric annulus array

Abstract

Provided is a parameter estimation method based on a virtual concentric annulus array. A receiving array is composed of actual array elements distributed on two concentric circular arcs, the number of the actual array elements is an even number, each concentric circular arc comprises an inner circular arc and an outer circular arc, each inner circular arc and each outer circular arc are arranged on the different sides of a coordinate original point, and do not overlap with each other, a connecting line between the end point of each inner circular arc and the end point, far away from the end point of each inner circular arc, of each outer circular arc penetrates through the coordinate original point, a reference array element is arranged on the coordinate original point, and a connecting line of each actual array element on each inner circular arc and each corresponding actual array element on each outer circular arc penetrates through the coordinate original point. The parameter estimation method based on the virtual concentric annulus array comprises the following steps of (1) measuring a measurement phase difference between each actual array element and the reference array element, (2) determining a measurement phase difference between each virtual array element and the reference array element, (3) determining a virtual short basic line theoretical phase difference of an incoming signal, (4) determining a phase ambiguity multiple of a long basic line theoretical phase difference through the virtual short basic line theoretical phase difference, and (5) determining a long basic line accurate estimation phase difference according to the phase ambiguity multiple, and obtaining an estimated value of a two-dimensional arrival angle of the incoming signal according to the accurate estimation phase difference of the incoming signal on a long basic line.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a parameter estimation method based on a virtual concentric circular array. Background technique [0002] The phase interferometer has the advantages of passive direction finding, high direction finding accuracy, high sensitivity and good real-time performance, so it is widely used in the direction finding system in the field of electronic reconnaissance. When the baseline (spacing) between the array element antennas is less than half a wavelength, there is no DF ambiguity, and the output phase (measured phase) of the phase interferometer is the same as the theoretical phase (real phase). However, in practical applications, in order to reduce the mutual coupling between array elements and improve the estimation accuracy of parameters, or because the diameter of the array element antenna is greater than half a wavelength and other reasons, the baseline length is greater ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a parameter estimation method based on a virtual concentric ring array when the number of array elements is even when the existing defuzzification method is not applicable. This method can be used for single signal or Estimation of parameters such as angle of arrival or polarization parameters of multiple signals

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