Research On Waveform Design And Performance Evaluation Based On Integrated Radar And Communication

In recent years,whether in the military field or in the civil field,the functions of radar and communication system have become increasingly perfect.With the continuous development of information technology,there are more and more intersections between the two independent disciplines.At the same time,whether in the complex battlefield environment of modern war or in the scene of people's daily use,there are higher and higher requirements for the integration of equipment,lightweight and reducing energy consumption,so the integration of radar communication has become a hot interdisciplinary research topic.In this paper,an integrated radar and communication system based on Orthogonal Frequency Division Multiplexing(OFDM)is studied.(1)Aiming at the realization scheme of the integrated radar and communication system,this paper introduces the phase coding technology into the traditional OFDM signal from the perspective of integrated waveform design,modulates the OFDM signal with Logistic chaotic sequence with good autocorrelation performance,and proposes an integrated Multi-Carrier Phase Coded(MCPC)signal,TFRC-MCPC signal.In this paper,the signal model of the integrated signal is given,the generation mode of chaotic sequence and the corresponding modulation process are described,and the ambiguity function of the integrated signal is derived.Through the simulation of the ambiguity function and its zero Doppler/delay plane,the joint high resolution of range and Doppler of TFRC-MCPC signal and the good radar detection ability are proved.According to the simulation results of communication error rate,TFRCMCPC signal has similar communication ability with common communication signals.(2)Aiming at the anti-jamming performance of the signal,the random redundancy matrix is introduced into TFRC-MCPC signal,and an IPD-MCPC signal with anti-Intermittent Sampling Repeater Jamming(ISRJ)performance is proposed.The signal model and ambiguity function of the signal are given.The simulation results show that the IPD-MCPC signal has good resolution and better target detection ability.This paper introduces the interference suppression factor to quantitatively analyze the anti-ISRJ performance of the signal.Through time-frequency analysis and simulation experiments,it is verified that the anti-SRJ performance of IPD-MCPC signal is better than that of traditional Linear Frequency Modulation(LFM)signal and MCPC signal,and its interference suppression factor is 1?2dB higher.(3)Using GNU radio software platform and USRP N210 hardware equipment,the hardware in the loop simulation experiment of the integrated signal proposed in this paper is carried out.Aiming at the radar's performance of low interception,anti-copy and forward interference,anti-ISRJ and communication error rate performance,several groups of comparative experiments are designed.The feasibility and effectiveness of TFRC-MCPC signal and IPD-MCPC signal are further verified.