Research On Shared Signal Design And Processing Algorithms For Radar Communication Integration

With the severe shortage of spectrum resources and the urgent demand for the multi-functional electronic communication devices,the joint design of different devices has gradually become a development trend.In recent years,both wireless communication technology and radar technology have developed rapidly,and the spectrum resources used for competition have overlapped with each other.They have great similarities in the system structure and working principle.Therefore,it is of great significance to realize the joint design of radar system and communication system.In this thesis,the joint design scheme based on shared signal for radar and communication integration is adopted.A radar communication integrated shared signal(OFDM-LFM-RCI)is designed based on OFDM modulation technology and LFM signal.The radar performance and communication performance of the shared signal are analyzed by theoretical research and experimental simulation.The simulation results show that the OFDM-LFM-RCI shared signal can be used to detect the distance and speed of the target,and has high range resolution and speed resolution.Besides,it can achieve high communication transmission rate at the same time.However,there is a serious problem that the peak-to-average power ratio(PAPR)is too high.For this problem,a new cascaded SLM algorithm(J-Ca-SLM)based on the judgment mechanism is designed,which is optimized on the basis of conventional SLM algorithm.The J-Ca-SLM algorithm divides the conventional SLM algorithm into two-level cascaded form and introduces a judgment module between the two levels.This design can greatly reduce the computational complexity of the algorithm and improve the PAPR suppression ability for the shared signal.In order to further improve the effect of PAPR suppression,a new joint algorithm J-SLM-PTS combining the traditional SLM algorithm with the PTS algorithm is present.The joint algorithm with the advantages of the conventional SLM algorithm and PTS algorithm has high PAPR suppression capability,and has low computational complexity.Through experimental simulation analysis,the optimized J-Ca-SLM algorithm and J-SLM-PTS algorithm have lower computational complexity and better PAPR suppression effect than conventional SLM algorithm and conventional PTS algorithm.