Research On Photonics-Assisted Joint Radar-Communication System

In order to strengthen the integrated combat capability of the military,the information-warfare platform has developed from a single function platform to a multifunction platform(such as radar,communication,guidance,etc.).However,the stacking of electronic equipment with different functions will not only cause serious electromagnetic interference,but also be unfavorable for equipment on small platforms with limited volume,size,power and other resources.In order to solve the above problems,people put forward the joint radar-communication system,which deeply integrates radar with wireless communication.It can not only facilitate the sharing of spectrum,software and hardware between radar and communication systems,but also reduce the size of the combat platform and reduce power consumption.At present,the joint radar-communication system realized by traditional electrical methods is limited by the electronic bottleneck and the working bandwidth and working frequency band are difficult to improve.In addition,because such systems cannot interact with complex electromagnetic environment,the ability of such systems to resist malicious electronic interference is poor,which limits the application scenarios of joint radarcommunication system.Therefore,it is necessary to seek new auxiliary technologies to cooperate with the joint radar-communication system to monitor interference sources,so as to improve the working efficiency of the target detection and wireless communication of the joint radar-communication system.Microwave photonics,which uses optical means to generate and process microwave signal,has great advantages in generating high-carrier-frequency,largebandwidth signal,improving the performance of the frequency measurement system,and improving the flexibility of system.It has received extensive attention in recent years.Therefore,this thesis focuses on microwave photonics,and carries out relevant research on joint radar-communication system and photonics-assisted spectrum detection system based on one-bit compressive sensing,including:1.The joint radar-communication system based on microwave photonic is studied.And the feasibility of the system for radar detection and wireless transmission is verified through experiments.Radar range detection with an error of less than 4 cm,inverse synthetic aperture radar imaging with a resolution of 14.99 cm × 3.25 cm,and communication with a data rate of 105.26 or 210.52 Mbit/s are successfully verified.The joint radar-communication system based on microwave photonic is further studied through simulation experiments,and the wireless transmission performance of joint radar-communication waveform under different parameters is compared.And the balance between radar and communication performance is analyzed;2.A photonics-assisted spectrum detection system based on one-bit compressive sensing is studied.In the proposed system,the stimulated Brillouin scattering is used to construct a microwave photonic filter;at the same time,the photonic-assisted one-bit compressive sensing receiver is used to reduce the sampling rate and bit number to optimize the system hardware.The proposed scheme is verified by simulation,which proves that the scheme is feasible for spectrum monitoring in complex electromagnetic environment.In conclusion,this thesis provides a feasible solution for joint radarcommunication system,and proposes a photonics-assisted spectrum detection system based on one-bit compressive sensing to assist joint radar-communication system to improve its anti-interference performance.