Two-channel correlation interferometer direction finding sample linear interpolation method

Abstract

The two-channel correlation interferometer direction-finding sample linear interpolation method disclosed by the invention is high in direction-finding accuracy and high in direction-finding speed. According to the technical scheme, the method comprises the following steps: calculating a phase difference between IQ signals received by a reference antenna unit and IQ signals received by other antenna units based on IQ signals collected by a dual-channel direction-finding receiver, and forming a direction-finding vector according to the calculated phase difference; calculating a full-phase-difference sample according to a calculation relation between phase differences, forming a direction-finding vector and an objective function model under a direction-finding system, and forming a complete direction-finding sample database through linear interpolation; and according to the frequency of the direction finding vector, reading a phase difference data matrix of a corresponding frequency point in the direction finding sample database, performing correlation calculation on the measured direction finding vector and the read phase difference data matrix, and taking the position with the maximum correlation value as an estimated value of the direction. According to the invention, the problem of low efficiency of receiving and retesting and establishing a phase difference sample library in the prior art is solved.

Description

technical field [0001] The present invention relates to a dual-channel correlation interferometric direction-finding technology in the technical field of radio direction finding, in particular to a dual-channel correlation interferometer direction-finding method based on linear interpolation of measurement samples. Background technique [0002] With the rapid development of the radio communication industry, the radio spectrum resources are increasingly tight, and radio direction finding technology has more and more important applications in the fields of communication, radar and sonar. Radio direction finding is a science closely related to radio engineering, radio electronics, geophysics, radio communication technology, computer technology, and digital technology. The physical basis of the method for measuring the direction of radio signals is the far-field propagation characteristics of electromagnetic waves. The plane or spherical electromagnetic wave in the far-field re...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a direction-finding method with high accuracy, fast direction-finding speed, sensitive direction-finding, and anti-interference for the problem of low efficiency of data collection and re-measurement and establishment of a phase difference sample library in the existing correlation interferometer direction-finding technology. Strong ability, based on the linear interpolation of direction finding samples, the dual-channel correlation interferometer direction finding method can solve the problem of low efficiency in the existing correlation interferometer direction finding technology, such as collecting data and retesting, and establishing a phase difference sample library

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