Programmable beam forming network on basis of optical wavelength division multiplexing technology

Abstract

The invention relates to a programmable beam forming network on the basis of an optical wavelength division multiplexing technology, which structurally comprises a wavelength division multiplexer, an electrooptic modulator, a 1*2 optical switch, a 2*2 optical switch, an optical amplifier, a circulator, a Faraday rotatormirror and an optical fiber true-time delay line. According to the invention, coherent microwave carrier signals with different phase delays can be generated, so that a function of an electric phase shifter in a conventional electric-control phase-control array radar is replaced and an aperture effect in the conventional phase-control array radar is greatly eliminated; and the programmable beam forming network has the advantages of ultra wide band, large dynamic range, programmable control and the like.

Description

technical field [0001] The invention relates to a device in the field of microwave photonics, in particular to a programmable beamforming network with ultra-wideband and large dynamic range based on optical wavelength division multiplexing technology. Background technique [0002] Phased array antenna systems are widely used in fields such as radar and communication systems, and one of the essential components is the phase-delayed beamforming network. In the traditional electronically controlled phased array antenna, an electric phase shifter is set on each antenna unit to change the phase relationship of the signals between the antenna units, so as to provide coherent microwaves with different phase differences for the phased array radar. Signal. However, the traditional electronically controlled phased array radar is limited by the "aperture effect" of the phased array antenna (see Zhang Guangyi, Zhao Yujie, Phased Array Radar Technology. Beijing: Electronic Industry Pres...

AI Technical Summary

Problems solved by technology

However, the traditional electronically controlled phased array radar is limited by the "aperture effect" of the phased array antenna (see Zhang Guangyi, Zhao Yujie, Phased Array Radar Technology. Beijing: Electronic Industry Press, 2006.12:390-392), that is, the signal The frequency change will cause the beam pointing to shift, thus limiting the bandwidth of the radar, which can only be scanned in a relatively narrow signal bandwidth, which limits the performance of its wide bandwidth angle scanning, thus restricting the phased array antenna in complex Applications in the field of environment and high performance

This is a huge drawback for radars, radar imaging and spread spectrum signal radars where high resolution measurements are to be made

Images