Uniform circular array correlation interferometer direction finding method and system

Abstract

The invention discloses a uniform circular array correlation interferometer direction finding method and system, and the method comprises the following steps: receiving a measured signal, and obtaining the amplitude information vector of each array element in a pre-configured direction finding array element combination, calculating the relative amplitude of a target array element except the reference array element in the direction-finding array element combination and the reference array element according to the amplitude information vector, and calculating the phase difference information of the target array element and the reference array element according to the amplitude information vector; according to the size relationship between the value of each relative amplitude and a preset interval, judging whether there is a shielding array element, if there is a shielding array element, selecting a corresponding first phase difference vector from a phase difference sample library according to a shielding angle range corresponding to the shielding array element, and calculating a correlation coefficient between the phase difference information and the first phase difference vector, the angle corresponding to the maximum value of the correlation coefficient is the incident angle of the measured signal. According to the method, the shielding condition of each array element in the uniform circular array relative to the received signal can be accurately judged, the direction finding error is eliminated, and the calculated amount is reduced.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a direction finding method and system of a uniform circular array correlation interferometer. Background technique [0002] Radio communication occupies an increasingly important position in the field of communication. With the increasing popularity and wide application of radio communication in military and civilian use, in order to make better use of spectrum resources, the direction of arrival of electromagnetic waves is usually measured in electronic monitoring. Required, i.e. radio direction finding. The structure that uses the phase information contained in the signal received by the array element to measure the incident angle of the incoming wave signal is generally called an interferometer direction finding system. [0003] The interferometer direction finding method is a direction finding method that obtains the direction information of the signal to be measured by extr...

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Problems solved by technology

[0006] The antenna array commonly used in the actual direction-finding system is a uniform circular array containing multiple array elements. Each array element is evenly arranged along the circumference of the circle. When the range is incident, the influence of the central array element and structural parts will cause the problems of weak received signal and large deviation of phase difference estimation for individual array elements, such as figure 1 As shown, for a five-element uniform circular array, when the signal incident angle is 0°, the amplitude of the synthesized signal of array element 2, array element 5 and array element 1 is relatively large, while that of array element 3, array element 4 and array element 1 The amplitude of the synthesized signal is small, causing array element 3 and array element 4 to become occluded array sources. The phase difference estimation error based on the phase difference between array element 3 and array element 4 is relatively large. If you directly use the phase difference between array element 3 and array element 4 Phase information will seriously affect the subsequent direction finding accuracy

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