Single Microwave Signal Direction of Arrival Estimation Method Based on Microwave Photons

Abstract

The invention proposes a method for estimating the direction of arrival angle of a single microwave signal based on microwave photons, aiming at realizing the estimation of the direction of arrival angle of a single microwave signal under the premise of reducing the amount of calculation, and improving the accuracy of the estimation. The implementation steps are as follows: build a microwave photonic system S; four receiving antenna units receive a single microwave signal whose direction of arrival angle is to be measured; the first Mach-Zehnder modulator M1 performs intensity modulation on the microwave signal and the optical carrier signal; M2, M3 and M4 Intensity modulation is performed on the received microwave signal and the first-order sideband signal output by M1 respectively; C1, C2 and C3 respectively measure the optical power of the carrier frequency signal; calculate the actual observation vector and perform noise suppression on it; use the formula of convex optimization problem , to calculate the corresponding direction of arrival angle θ of the microwave signal v(t) to be measured. The invention adopts a system based on microwave photons to estimate the direction of arrival of signals, uses a formula of convex optimization problem to process the calculation data, improves the estimation efficiency and estimation accuracy, and can be used for target detection and passive positioning.

Description

technical field [0001] The invention belongs to the technical field of photoelectric communication, in particular to a method for estimating the angle of arrival of a single microwave signal, which can be used for target detection and passive positioning. Background technique [0002] Microwave signals refer to electromagnetic wave signals with a wavelength between 0.1 mm and 1 meter. Since the 1970s, with the vigorous development of photonics and microwave technologies such as semiconductor lasers, high-speed optoelectronic modulators, fiber optics, integrated photonics, microwave antennas, and microwave monolithic integrated circuits, there has been a Microwave photonics is an interdisciplinary field combining the two disciplines of microwave and optics. Microwave photonics is an emerging subject, which studies the use of photonics methods to process microwave signals. The unique advantages of microwave photonics technology, such as large bandwidth, small integrated volu...

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Problems solved by technology

For example, in the application publication number CN107528638A, the patent application titled "Method for Estimating the Angle of Arrival of Broadband Microwave Signals Based on Microwave Photon Filtering" discloses a method for estimating the angle of arrival of broadband microwave signals based on microwave photon filtering. The method utilizes polarization multiplexing The Mach-Zehnder modulator, combined with the differential delay module, constructs a double-tap microwave photon filter, performs notch filtering on the input electrical signal and observes the results, but the calculation of this method is relatively complicated, and the estimation efficiency and estimation accuracy are low.

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