Design The Integrated Waveform Of Radar And Communication Based On MIMO-OFDM

At present,on mobile platforms such as ships and airplanes,radar modules,communication modules and other electronic modules are independent of each other.Thus occupying a large amount of effective space for the combat platform,and bringing huge challenges to the flexibility and miniaturization of the combat platform.And there is electromagnetic interference between different electronic modules,which greatly reduces the overall effectiveness of the device.With the development of signal processing technology and the upgrading of related hardware platforms,the RF front-end structure of radar system and communication system is becoming more and more similar.It makes the application that must be completed by independent hardware can be shared at the software level through signal processing technology,which provides a solid foundation for the realization of radar and communication integration at the system level.The next step is to design an integrated waveform that can be processed by both radar and communication systems.It can not only solve hardware resource sharing,reduce electromagnetic mutual interference,but also solve the problem of limited use of spectrum resources,and effectively utilize valuable spectrum resources.This paper starts with the integrated waveform design of radar and communication.Firstly,the development status of the integration of radar and communication at home and abroad and the research status of integrated waveform design are introduced.Then with the difference and similarity of radar and communication system,this paper discusses the possibility of integrated radar and communication,and introduces the key technologies those used in this paper MIMO,OFDM and ant lion optimization algorithms.The next step is to determine the waveform parameters of the integrated waveform design.Firstly,the integration of radar and communication system with MIMO and OFDM adopted in this paper is introduced.And based on the radar performance evaluation function and the communication performance evaluation function,the function to be optimized for integrated waveform is constructed.This paper introduces multi-objective ant lion optimization algorithm to waveform design field,the multi-objective ant lion optimization algorithm is used for optimizing the optimization function to obtain the optimal parameters of the integrated waveform.Finally,the signal form of the integrated waveform carrier and the phase encoding pattern of OFDM are determined.Designing the final waveform in combination with the optimal waveform parameters,and analyzing the ambiguity function and communication error rate.In this paper,the integrated waveform of radar and communication selects the chirp signal as the carrier,and the complementary P4 code as the phase encoding mode of OFDM.And then the integrated waveform designed with the optimal parameters is no longer a "thumbtack" ambiguity function sensitive to doppler shift,but a "discontinuous oblique edge" ambiguity function composed of a set of peaks,this causes it to have some of the characteristics of the chirp signal.With the complementary P4 code,it can be seen that the degree of occlusion of the main lobe by the side lobes is effectively suppressed in the zero doppler section view.The quaternary complementary P4 code is used to make the integrated waveform have a lower bit error rate when applied to the communication system,and MIMO technology is used to transmit different communication information by using different antennas,thereby obtaining a high information transmission rate.