Uniform circular array dual-channel interferometer direction finding method, device and system

Abstract

The invention discloses a uniform circular array dual-channel interferometer direction finding method, device and system. The method provided by the invention comprises the steps that a pre-established angle estimation model is acquired, and the relationship between a direction finding error of the uniform circular array dual-channel interferometer and baseline selection is acquired; a preferred baseline which minimizes the direction finding error is acquired according to the relationship; the preferred baseline is used to carry out dual-channel time-division direction finding on the signal toacquire the phase difference measurement value of the signal; after the phase difference measurement value is substituted into the angle estimation model, the least squares method is used to solve the angle estimation model to acquire the estimated values of azimuth parameters and elevation angle parameters in the angle estimation model. According to the invention, the relationship between the direction finding error of the direction finding system of the uniform circular array dual-channel interferometer of an arbitrary unit and direction finding baseline selection is analyzed; the preferredbaseline which minimizes the direction finding error is acquired based on the relationship; and the preferred baseline is used for dual-channel time-division direction finding to give full play of the effectiveness of the direction finding system.

Description

technical field [0001] The invention relates to the technical field of interferometer direction finding, in particular to a uniform circular array double-channel interferometer direction finding method, device and system. Background technique [0002] The array antenna direction finding system is an important passive direction finding equipment. Compared with the active radar system, in addition to the advantages of anti-interception and anti-jamming, it also has the advantages of high direction finding accuracy, small volume and weight, and low cost. attention in recent years. In the array direction finding system, the uniform circular array interferometer direction finding system is widely used because of its isotropy and easy application. [0003] The commonly used uniform circular array interferometer direction finding system adopts the method of multi-array elements to measure the phase at the same time to extract the phase difference of each baseline. This method has ...

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Problems solved by technology

[0003]The commonly used uniform circular array interferometer direction finding system uses the method of simultaneous phase measurement of multiple array elements to extract the phase difference of each baseline. This method has high direction finding accuracy, but the system Complicated; a method that reduces the direction finding accuracy but greatly simplifies the system is to adopt a dual-channel phase measurement system, that is, the direction-finding system is only equipped with dual-channel receiving and processing equipment, and only two selected array elements are used at a certain time Measure its signal phase, and then extract the phase difference to realize interferometer direction finding

[0004]However, for the uniform circular array dual-channel interferometer direction finding system, whether the choice of the direction finding baseline will affect the direction finding accuracy and how to choose the baseline are still few problems Some studies have restricted the efficient application of uniform circular array dual-channel interferometers

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