High-precision interferometer

Abstract

The invention discloses a high-precision interferometer, which comprises an antenna array, radio frequency channels and a baseband processing module. The antenna array is connected with the radio frequency channel, the radio frequency channel is connected with the baseband processing module, the antenna array comprises six antennas, four antennas form two long base lines which are perpendicular to each other, and the other two antennas are combined with two of the four antennas to form two short base lines which are perpendicular to each other; the number of the radio frequency channels is three, the radio frequency channels are communicated with the corresponding antennas through the change-over switches respectively, and the incident angle is calculated through the baseband processing module and used for measuring the incident wave incident angle in real time. According to the invention, by adding the antenna array, the angle measurement precision is improved under the condition of low cost; by adding a base line perpendicular to an original base line, it is guaranteed that an incident wave enters from any direction, and the included angle between the vertical line of one base line and the incident wave is always smaller than or equal to 45 degrees; through a channel switch switching mode, only antennas are added, radio frequency channels are not added, and the cost is controlled.

Description

technical field [0001] The invention belongs to the technical field of radio direction finding, and relates to a high-precision interferometer. Background technique [0002] The interferometer direction finding technology uses the same phase wave front of the electromagnetic wave of the radiation source in the propagation direction to arrive at the spatially separated sensor (usually a multi-element antenna array), resulting in different phase responses and the resulting mutual phase relationship, to find direction. Interferometers are divided into dual-channel interferometers and multi-channel interferometers according to the number of channels, and single-baseline interferometers, double-baseline interferometers, and multi-baseline interferometers according to the number of baselines. In order to improve the lateral accuracy, a three-channel long-short baseline interferometer is generally used. The short baseline is used to resolve ambiguity, and the long baseline is used...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor angle measurement accuracy when the incoming wave direction is close to parallel to the baseline, a servo system is usually installed under the interferometer, which can adjust the direction of the incident wave in real time, but the volume and cost of the servo system are relatively high

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