Waveform Design And Performance Analysis Of Integrated FD-MIMO Radar-communication Systems

With the development of science and technology,a wide range of on-board communication equipment and radar monitoring equipment emerge.In order to realize the communication and detection sensing functions at the same time,these devices need to be integrated into a small vehicle space.The position of many electronic devices is too close to each other,which will produce electromagnetic interference,which will affect the performance of communication equipment and radar equipment.Radar communication integration technology can eliminate the interference between different equipment and achieve the purpose of making all kinds of electronic equipment work together.For a long time,communication technology and radar technology have been studied separately.However,both of them have many similarities in terms of basic data processing structure and working frequency,which provides theoretical basis for the research of radar communication integration technology.This paper mainly studies the integrated radar communication system based on phase modulation and frequency diversity multiple input and multi output(FD-MIMO).Firstly,the principle and implementation method of phase modulation and frequency modulation are briefly introduced.The difference between traditional MIMO radar and FD MIMO Radar in beam diagram is simulated and analyzed,Then,the FD MIMO radar communication integration system model based on transmit beamforming is proposed.The estimated performance and transmission rate of the radar are analyzed based on the matched filtering signal.In terms of radar performance,the closed solution of Cramer-Rao Lower Bound(CRLB)is obtained by using Jacobian matrix analysis.In terms of communication performance,the key indexes such as output signal-to-noise ratio,channel capacity and transmission rate of the communication end are derived,Then,according to the requirements of beamforming vector at the transmitter,a set of beamforming vectors are given to simulate the detection performance and communication reception performance of radar respectively.Finally,according to the known radar output signal,classical music algorithm and sparse reconstruction algorithm are used to estimate the range angle.The simulation results of the two algorithms are obtained.The feasibility of the two algorithms is verified by the simulation results of the two algorithms.Then,the mean square error is selected to analyze the estimation performance of music algorithm and sparse reconstruction algorithm respectively,and the final curve of mean square error with signal-to-noise ratio is obtained.