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Research On Photonic Generation Of Phase-Coded Microwave Signal And Phase Shift

Posted on:2019-03-06Degree:MasterType:Thesis
Country:ChinaCandidate:L HaoFull Text:PDF
GTID:2428330572458974Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Generation of phase-coded signals and phase shift are indispensable technologies for modern radar systems.In traditional radar systems,signals are usually transmitted and processed in the electric domain.However,this method has serious electronic bottlenecks,such as bandwidth limitations,serious electromagnetic interference and so on.In recent years,microwave photonic technology has begun to emerge,which can effectively solve the shortcomings of the above-mentioned electric-domain methods.The microwave photonic phase-coded signal has a large time-bandwidth product;The microwave photonic phase shifter can continuously adjust the phase and has a large phase adjustment range.In addition,both of them have the common advantages of microwave photonic technology,such as large frequency operation range,low transmission loss,no electromagnetic interference,small system size,and light weight.In this thesis,the technology of microwave photonic phase-coded signal generation and microwave photonic phase shift are studied.The main work is as follows:1.Explains the development trend of the radar system in electric-domain,explains the advantages of pulse compression and phase-coded technology,the bottleneck of generating pulse compression signals in electric-domain and the electric-domain phase shifter,the advantages of the microwave photonic technology compared to the electric-domain technology.The research status of microwave photonic phase-coded signal generation and microwave photonic phase shifter at home and abroad is summarized.The basic principles of optical external modulation,pulse compression,phase-coded techniques and several common external modulators,photodetectors and external modulation methods are introduced.2.An arbitrary phase-coded signal generation scheme based on the dual parallel mach-zehnder modulator(DP-MZM)and the polarization modulator(Pol M)is proposed and verified by simulation.No electric or optical filters are used in the scheme,so the frequency can be adjusted well,and it can generate arbitrary phase-coded signal with good reconfigurability.Binary and quaternary phase-coded signals are generated in the simulation,and the frequency adjustment of the scheme and the pulse compression performance of the generated phase-coded signal are verified.3.An arbitrary phase-coded signal generation scheme based on dual polarization modulator(Dpol-MZM)and optical band pass filter(OBPF)is proposed and verified by simulation.Compared with the previous scheme,this scheme only uses one integrated modulator,so the stability of the system is better,and an arbitrary phase-coded signal can also be generated.Binary and quaternary phase-coded signals are generated in the simulation,and the pulse compression performance of the generated phase-coded signal is verified.4.A phase-coded signal generation scheme based on dual polarization modulator(Dpol-MZM)with frequency doubling is proposed and verified by simulation.The demand for RF local oscillator signal frequency is reduced because of the frequency-doubled characteristic.In addition,the scheme uses only a single integrated modulator and does not use any filters.In the simulation,10 GHz and 16 GHz frequency-doubled phase-coded signals are successfully generated,and the pulse compressibility of the generated signals is verified.5.A microwave photonic phase shift scheme based on DP-MZM modulator with frequency quadrupling is proposed and experimentally validated.This scheme can adjust the phase from 0°to 360°and generate the frequency-quadrupled signal at the same time,which significantly reduces the frequency requirement of the system for the RF local oscillator signal.No filters are used and this scheme can be extended to multi-channel applications.In the experiment,the full-scale adjustment phase,quadruple frequency,and frequency tuning ability of the scheme are verified in experiments.
Keywords/Search Tags:Modern radar system, microwave photonic technology, phase-coded, quadruple frequency, phase shift
PDF Full Text Request
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