Light-operated receiving beam forming method and device
A technology for receiving beams and beams, which is applied in the field of beamforming methods and devices based on microwave photonics, can solve the problems of limited optical wavelength resources and the popularization and application of optically controlled radio frequency beams, and achieve the requirements of reducing the number of optical carriers and reducing delay loss , Increase the effect of instantaneous bandwidth
Pending Publication Date: 2022-04-08
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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Obviously, the excessive demand for optical wavelength resources severely limits the popularization and application of optically controlled RF beamforming networks in receive mode
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[0036] The present invention will be further described below in conjunction with the accompanying drawings.
[0037] Aiming at the deficiencies of the existing technology, the present invention realizes the optical domain delay control and superposition of array receiving signals by designing a serial optically controlled receiving radio frequency beamforming network structure and multiple utilization of a single optical carrier to achieve wide bandwidth corner scan.
[0038] Specifically, when applied to a linear array of N array elements, the optically controlled radio frequency receiving beamforming device proposed by the present invention includes: N electro-optic modulation and superposition modules: used to receive the nth array element in the antenna array signal n (t) Delay τ n After action intensity is I IN,n On the nth input optical signal of (t), the intensity of the nth output optical signal is I OUT,n (t)=[I IN,n (t)+a n the s n (t-τ n )]; said a n is the...
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In various implementations of a delay control network, optically controlled radio frequency beamforming based on microwave photonics gains attention from researchers of various countries with its outstanding potential advantage. Through electric / optical and optical / electric conversion, the light-controlled radio frequency beam forming network can transfer delay control of broadband electric signals to an optical domain to be completed, and extra time-frequency resources of the optical domain can be introduced for delay control while the advantages of large instantaneous bandwidth, light weight, electromagnetic interference resistance and the like of the photon technology are fully played. However, when an existing optically-controlled radio frequency beam forming network scheme is applied to received beam forming, optical carriers with different wavelengths need to be allocated to each delay channel so as to avoid signal fluctuation caused by optical domain interference during signal superposition. Obviously, the excessive demand on optical wavelength resources seriously limits the popularization and application of the light-controlled radio frequency beam forming network in a receiving mode. The invention overcomes the defects in the prior art, provides the tandem light-operated receiving radio frequency beam forming method and device, and can realize superposition formation and scanning control of linear array receiving beams by using a single-path light carrier.
Description
technical field [0001] The invention relates to microwave photonic radar technology, in particular to a beam forming method and device based on microwave photonics. Background technique [0002] In the array antenna system, the reconstruction of the radiation characteristics such as the main lobe of the array can be realized by adjusting the amplitude, phase and delay of the receiving and receiving signals of each array element. This technology is called beamforming. After decades of development, beamforming technology has been widely used in radar, wireless communication and other systems. As the relative bandwidth of the signal carried by the array antenna system continues to increase, the traditional phase-shifting-based beamforming network will have problems such as aperture crossing and beam skew, and it is difficult to meet the wide-bandwidth angular beam scanning requirements of the new generation of advanced microwave radio frequency systems. The fundamental way to ...
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IPC IPC(8): G01S7/02G01S7/48
Inventor 叶星炜邵光灏张国强
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST