Design Of Radar Communication Integration System Based On MPSK-DSSS

With the development of modern science and technology,various civil vehicle platforms and military combat platforms are developing rapidly.The platform need to carry more and more electronic equipments,such as radar equipment and communication equipment.However,many electronic equipments need to occupy a large amount of space,which affects the mobility of the platform.Electromagnetic interference will also occur between the equipment,affecting the operation effect of radar equipment and communication equipment at the same time.Therefore,there is an urgent need for an integrated technology to enable different types of electronic devices with different functions to work together.Although radar technology and communication technology have developed independently for a long time,they have many similarities in terms of principle,structure and working frequency.Therefore,it is theoretically feasible to study the radar communication integration technology on the platform,and the integrated system designed can also combine the respective advantages of radar system and communication system,which is very important for the function of integrated equipment and the flexibility of the platform.This paper studies radar communication integration system based on phase modulation and direct sequence spread spectrum.Firstly,the system model of radar communication integration signal based on MPSK-DSSS is analyzed,and the mathematical expression of integration signal is deduced.According to the mathematical model of the integrated signal,the communication performance and radar detection performance of the integrated signal are further analyzed.The radar detection performance mainly includes the resolution of the integrated signal,signal-to-noise ratio,detection probability and false alarm probability,and the communication performance mainly includes communication rate and symbol error rate.Then,aiming at the problem of poor detection performance of integrated signal radar,a joint optimization scheme for integrated signal detection performance is proposed,which mainly includes the optimization of peak sidelobe level and the optimization of radar receiver processing curve.The communication performance and radar detection performance of the integrated signal are simulated to verify the accuracy of the theory and the feasibility of the scheme.Comparing the performance of integrated signal with other existing integrated signal schemes,the advantages and disadvantages of various integrated signal schemes are analyzed.Finally,a joint estimation of information and time delay based on backscattering is briefly analyzed.An information estimation scheme based on differential phase coding and a delay estimation scheme based on maximum likelihood are presented which explores the next research direction.