Space-time-frequency multidimensional modeling method for optically controlled radio frequency beamforming system

Abstract

The invention discloses a time-space-frequency multi-dimensional modeling method for a light-controlled radio frequency beam formation system. The method comprises the steps that A, the light-controlled radio frequency beam formation system is decomposed into an antenna array composed of a group of antenna units and a group of parallel microwave photon links in one-to-one correspondence with the antenna units; B, according to configuration of all the microwave photon links under the control state of a certain target beam of the light-controlled radio frequency beam formation system, a time frequency response of an optical device in each microwave photon link in an optical frequency band is mapped to be a time frequency sub-model of the microwave photon link in a microwave frequency band, meanwhile, radiation sub-models of all the antenna units are acquired, and a space domain sub-model of antenna array distribution is established; and C, the time frequency sub-models, the radiation sub-models and the space domain sub-model are fused into a time-space multi-dimensional frequency spectrum response function of the system. The method can adapt to various light-controlled microwave amplitude-phase delay methods and actual antenna and array conditions, and time-space-frequency multi-dimensional signal processing capability of the system is displayed.

Description

technical field [0001] The invention relates to a time-space-frequency multidimensional modeling method of an optically controlled radio frequency beam forming system, and belongs to the technical field intersecting microwave photonics and computer modeling. Background technique [0002] Optically controlled RF beamforming refers to the use of microwave photon technology to control the amplitude, phase, and delay of RF signals in the optical domain, so as to realize the beam scanning and other pattern reconstruction functions of the array antenna. Compared with the traditional pure electrical domain beamforming method, optically controlled RF beamforming has significant advantages in many aspects such as low transmission loss, large processing bandwidth, anti-electromagnetic interference, anti-corrosion, light weight, etc. an important direction. In recent years, unit technology innovations and system-level research results related to optically controlled radio frequency be...

AI Technical Summary

Problems solved by technology

However, there are two challenges in the modeling research of optically controlled radio frequency beamforming systems: First, due to the wide variety of implementations of optically controlled microwave amplitude and phase delay, the electro-optic modulation method and optical domain amplitude and phase delay control The mechanism of the device is different, so it is necessary to establish a unified model to describe the mapping relationship between the optical spectral response and the electrical spectral response under different electro-optical modulation methods

Second, the common existing modeling result is the pattern or array factor of single or multiple time-point frequency signals, but this cannot reflect the complete characteristics and information of the optically controlled broadband RF beamforming system, and greatly reduces the time-frequency The importance of this key parameter in system analysis does not match the large bandwidth characteristics of the optically controlled beamforming system, nor can it fully reflect the signal processing of the optically controlled broadband RF beamforming system in multiple dimensions such as time, space, and frequency. ability

Such a model cannot adapt to the research needs of the actual system, as well as new development trends such as conformal antennas and random arrays.

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