Integrated Waveform Design Of Vehicle Radar Communication Based On Spectrum Constraint

With the rapid development of IOV(Internet of Vehicles)technology,radar sensor will also be an indispensable sensing device in future vehicles,The vehicle can acquire the environmental information surrounding itself through the vehicle-mounted radar,and at the same time,the "over the horizon" environmental cognition can be received by the communication link.Therefore,it is a key step to design an integrated waveform that can satisfy the requirements of information transmission and radar detection.The integrated waveform designed by spectrum constraint has the advantages of high spectrum utilization and strong anti-interference ability.In the integrated waveform design of radar communication,the modulation of communication data will have a great impact on the detection performance of radar.In addition,the electromagnetic environment of the vehicle is complex,so the spectrum of electromagnetic wave cannot be effectively utilized,and the mutual interference between different electromagnetic devices is increasingly serious.As a result,the target detection capability of the vehicle integrated system is degraded,and the communication transmission rate and the bit error rate are not effectively guaranteed.The paper studies the integrated waveform design of vehicle-mounted radar communication,and analyzes its radar and communication performance separately.The main work is as follows:(1)A integrated radar and communication waveform design based on spectrum constraint random stepped-frequency LFM radar is proposed.The communication modulation term is added based on the LFM waveform,and the communication data is modulated by the frequency of the carrier.Aiming at the influence of radar waveform modulation communication information on radar detection performance,the information modulation frequency expansion coefficient is introduced to control it.At the same time,the communication performance of the signal integration system is analyzed.Based on the detailed analysis of the demodulation method of the signal and the estimation of the error probability,the communication performance in the integrated system of the signal is discussed.(2)For that the complex electromagnetic environment of vehicles and the low utilization rate of waveform spectrum,in order to further improve the spectrum utilization rate and anti-interference ability of integrated waveform,dynamic spectrum selection is carried out under the premise of spectrum constraints,and then a radar communication integrated waveform based on TDC is proposed.Based on the detailed analysis of the TDC system,an adaptive receiving method is adopted,which can ensure the reliable transmission of information even when the electromagnetic environment around the receiver changes or the basis function of the transmitting end is unknown.The simulation results show that the introduction of frequency expansion coefficient in the integrated waveform design scheme proposed in this paper significantly weakens the influence of communication data on radar performance,and the whole scheme achieves good results in radar detection a nd communication.It is a feasible integrated waveform signal for radar communication.Based on the TDC radar communication integrated design scheme,the spectrum constraint mechanism of transform domain communication is used to complete the spectrum selec tion of the integrated waveform.The simulation of the ambiguity function graph by FFT operation shows that the waveform has the characteristics of the low side lobes both the distance blur function and the velocity blur function.In terms of communication transmission,the simulation results show that the higher the number of iterations at the receiver,the lower the BER of the system communication.