Design Of Radar Communication Integrated Shared Signal Based On OFDM

As modern technology advances by leaps and bounds,combat platforms are also facing greater challenges and need to expand more functions to face increasingly complex combat environments.Therefore,optimizing the function of the original electronic device to realize a multi-functional integrated electronic system is a very urgent need,which can save system resources,reduce system volume,and reduce interference between various sub-devices.Moreover,the applicable scenarios of the integrated radar communication system are very wide,and it can be applied not only in the military field but also in the civilian field.The realization of an integrated detection and communication system in automated vehicle driving enables automated vehicles to detect the surrounding environment and share the detection information with other vehicles or base stations,which can reduce the occurrence of traffic accidents and facilitate people's daily travel.The design of a waveform that can perform communication and detection functions at the same time is the key to an integrated system,which can reduce electromagnetic interference and improve frequency band utilization.This paper mainly designs integrated radar communication waveforms around OFDM technology.Through the analysis of OFDM ambiguity function,it is proposed to use phase-encoded signals to reduce the influence of communication information on radar detection performance.Several typical phase-encoded signals and their performance are analyzed The Multi-CAN algorithm that can generate sequence sets of unlimited length and good correlation performance,compares and analyzes the performance of the generated sequences,and designs a phase-coded OFDM radar communication integrated signal based on this;then briefly introduces the chirp signal,Analyzed the performance of the ambiguity function,proposed to use BPSK,MSK and 16 QAM to modulate the communication information to the OFDM-LFM carrier to realize the functions of radar detection and communication transmission.The ambiguity function and error code of the three integrated waveforms designed were analyzed and compared.Finally,it is proposed to use the cyclic shifted OFDM-LFM signal to represent the communication information on the MIMO radar,thereby designing an integrated radar communication waveform,analyzing the ambiguity function and bit error rate of the waveform,and performing a simulation.In this paper,the sequence generated by the Multi-CAN algorithm is used as the phase-encoded signal and the integrated waveform generated by the OFDM technology has a sharp pin-shaped radar ambiguity function,which is suitable for imaging radar,and it is proved that it can suppress the communication information influences to the ambiguity function.Based on the OFDM-LFM radar,the three integrated waveforms generated by BPSK,MSK,and 16 QAM modulation have their own advantages and disadvantages.In terms of communication performance,the OFDM-based BPSK-LFM signal waveform has the lowest bit error rate.In terms of radar performance,the ambiguity function of the OFDM-based 16QAM-LFM signal waveform is close to the shape of a pushpin and has a higher resolution.The finally designed integrated waveform based on MIMO OFDM-LFM signal has radar performance similar to chirp signal,strong anti-interference ability against Doppler frequency shift,suitable for detecting high-speed moving targets,and good bit error rate performance.