Study On The Design Of Integrated Signal For Radar And Communication Based On OFDM-CPM

With the rapid development of modern electronic technology,the integration of radar and communication functions has gradually become the development goal of modern electronic equipment.The integration of radar communication is of great significance for reducing equipment load and volume and improving the system's environmental adaptability.Among them,the integrated waveform design of radar communication is the focus of integrated system design research.In this paper,an integrated radar communication waveform is designed for OFDM signals combined with CPM modulation technology.The radar fuzzy function,coherent accumulation,communication error rate,peak-to-average power ratio and other performance indicators are simulated and analyzed.The main work is as follows: :(1)The pre-modulation of the commonly used OFDM radar signals,including barker codes and P3P4 codes,is introduced.The simulation of the OFDM radar blur function with a simulated Barker code,the ideal OFDM radar signal coding and modulation can make the blur function exhibit ideal pin-like characteristics.(2)The specific analysis of the fuzzy function of the integrated signal of OFDM radar communication is analyzed,and the influence of the transmission communication information on the fuzzy function is analyzed.It is determined that the characteristics of the fuzzy function are affected by the auto-correlation and cross-correlation characteristics of the OFDM symbol.OFDM radar communication integrated signal fuzzy function,(3)Analyze the effect of the pulse compression phase change of OFDM radar communication integration signal on the coherent accumulation.It is determined that when the transmission communication information is a random sequence,the phase change has a linear relationship with the Doppler modulation,and the coherent accumulation of the target can be achieved by the Doppler compensation method.(4)Investigate the OFDM-CPM modulation radar communication integrated signal fuzzy function characteristics,the fuzzy function characteristics under the condition of random communication sequences,and for the extreme cases of communication(such as long-term transmission of the same sequence),the CPM modulation parameter method can be effectively improved Integrated signal fuzzy function characteristics.Simulate the phase change of the main lobe pulse pressure of the integrated waveform of OFDM radar communication.The phase change of the integrated waveform can be ignored during multi-pulse accumulation,which will not affect the coherent accumulation.Based on the Fourier transform,the influence of communication information is eliminated to realize the two-dimensional parameter estimation of radar target distance and speed,and the target distance and speed resolution are obtained.This method is suitable for the vehicle-mounted OFDM radar communication integration scenario.Simulate the performance of OFDM-CPM multi-parameter modulation bit error rate and peak-to-average power ratio.