Research On Integrated Radar Communication System Based On Dynamic Metamaterial Antenna

In the future post-5G and 6G era,in order to improve spectrum efficiency and reduce the electromagnetic interference problem between radar and communication systems,spectrum sharing between radar and communication has become a promising hot research field.Dual-Functional Radar-Communication(DFRC)is a technology in which radar and communication systems work on a common transmit/receive aperture,a common spectrum waveform,and a common design waveform.Dynamic Metasurface Antenna(DMA)is a typical transceiver antenna based on metasurface antenna,each metasurface antenna unit is composed of low-power metasurface,and the amplitude-frequency characteristics of each antenna unit can be dynamically adjusted in real time.At present,DFRC is mostly a hybrid beam antenna structure based on all-digital antennas and phase shifters,and DMA is cheaper than the above two antennas.Therefore,DMA-based DFRC has the necessity of research and application.The main research content of this essay includes the following three parts:Aiming at the radar beam design of radar communication integration based on dynamic metasurface antenna,considering the phase characteristics of the analog preencoder of dynamic metasurface antenna,an optimal preencoder scheme for fitting the all-digital antenna structure is proposed.The scheme uses analog and digital preencoders for alternate iterative optimization.The simulation results show that the dynamic metasurface antenna is superior to the radar beam of the hybrid beam antenna based on the phase shifter.Aiming at the integrated anti-jamming design of radar communication based on dynamic metasurface antenna,considering the phase characteristics of the analog preencoder of dynamic metasurface antenna,a minimum distortion-free response beamformer is introduced,and the analog and digital preencoders are used for alternate iterative optimization.The simulation results show that the signal-to-interference noise ratio of the radar receiver with DMA structure is close to that of the all-digital antenna structure.Aiming at the design of near-field radar communication integrated radar beam based on dynamic metasurface antenna,the design scheme of optimized radar beam is proposed.The scheme of fitting the optimal encoder of all-digital antenna is used to carry out alternate iterative optimization.The simulation results show that the radar beam of the far-field detection target is close to the radar beam without spectrum sharing under the premise that the signal-to-interference noise ratio of the nearfield communication user is higher than the given threshold.