Arrival angle measuring device based on microwave photon auxiliary phase discrimination

Abstract

The invention discloses an arrival angle measuring device based on microwave photon auxiliary phase discrimination. The device comprises an antenna array, a light source, a phase discrimination module, a polarization separation module, a balance detection module and a data processing module; the phase discrimination module is of a Sagnac loop structure with a dual-polarization dual-drive Mach-Zehnder modulator connected in series in a loop, and is used for performing phase modulation on the two paths of microwave signals received by the antenna array on two orthogonal polarization states of anoptical pulse sequence respectively, and enabling the modulated optical signals propagating forwards and backwards to form interference at an output port of the Sagnac loop structure; the polarization separation module is used for carrying out polarization state separation; the balance detection module is used for carrying out balance detection on the two paths of separated horizontal polarization state optical signals and two paths of separated vertical polarization state optical signals to respectively obtain phases of microwave signals modulated to a horizontal polarization state and a vertical polarization state; and the data processing module calculates an arrival angle according to the obtained phase information. Compared with the prior art, the device can perform high-precision detection on the arrival angle, and is simple in structure.

Description

technical field [0001] The invention relates to an arrival angle measuring device. Background technique [0002] Measuring the angle of arrival of microwave signals (for simplicity, hereinafter referred to as angle measurement) can determine the position of the target object, which is very important in applications in many fields such as communication and radar. For example, in indoor positioning, the accuracy of indoor positioning can be improved by measuring the direction information of low-power Bluetooth signals; in the field of unmanned driving, the specific direction of obstacles in the car position can be provided; in the field of electronic countermeasures, angle measurement can guide weapons attack, provide early warning information, and provide intelligence such as the direction and location of radiation sources. The existing angle measurement methods can be divided into amplitude method, time difference method and phase method. Compared with the amplitude method...

AI Technical Summary

Problems solved by technology

Using the existing phase detector structure, if angle measurement is required, two sets of phase detector systems need to be built, and the optical paths of the two systems need to be calibrated, resulting in complex structure and cumbersome operation

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