Microwave photon-based estimation method for direction of arrival angle of single microwave signal

Abstract

The invention provides a microwave photon-based estimation method for a direction of arrival angle of a single microwave signal, and aims to realize estimation of the direction of arrival angle of thesingle microwave signal on the premise of reducing the calculation amount and improve the estimation precision. The method comprises the following steps that: a microwave photonic system S is constructed; four receiving antenna units receive a microwave signal to be measured of a single direction of arrival angle; a first Mach-Zehnder modulator M1 performs intensity modulation on the microwave signal and the optical carrier signal; M2, M3 and M4 respectively carry out intensity modulation on the received microwave signals and the first-order sideband signals output by M1; C1, C2 and C3 respectively measure the optical power of the carrier frequency signal; an actual observation vector is calculated and noise suppression on the actual observation vector is performed; and the correspondingdirection-of-arrival angle [theta] of the microwave signal v(t) to be measured is calculated by adopting a formula of a convex optimization problem. According to the method, a system based on microwave photons is used for estimating the direction of arrival angle of the signal, a formula of a convex optimization problem is used for processing calculation data, the estimation efficiency and the estimation precision are improved, and the method 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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