The Airborne Applied Research Of The Waveform Of Radar-communication Integration

With the development of science and technology，various of different platforms isequipped more and more electronic equipments，such as radar，communication devices.These equipments not only improve the probability of survival of these platforms，butalso take up some space, reduce the maneuverability of the platform, and limit theplatform to further enhance performance. The radar and communication system have thesame principle. Although they are developped independently，they are more and morekindred. If radar and communication system are integrated，it could not only improvethe ability of the combat platform，but also make some advantage of radar system beused by the communication system，to improve the quality of communication.In this paper，we choose MSK-LFM as the signal of the radar-communicationintegration system，and research the airborne application. There are three parts in thispaper. In the first part，we analysis and simulate the signal processing of the PD radar，which is one of the most basic airborne radar. We use MSK-LFM and LFM as the signalof the PD radar，respectively. In the other part，because of the doppler offset andmulti-ray are the two factors of the aeronautical channel, we analysis the effect ofdoppler offset and multi-ray of MSK-LFM, derivate the probability of bit error ofMSK-LFM with doppler offset or in multi-ray environment, and derivate the probabilityof bit error of MSK-LFM in a certain air channel. In the last part, we put forward theframe structure and offset estimation scheme of radar-communication integrationsystem. In addition, we analysis the contradiction between the communication rate andthe detection range of radar in the radar-communication integration system.The research results prove that MSK-LFM, could be used as the radar signal in PDradar, and has the same abilities of detection with LFM; as the communication signal，MSK-LFM behave better than MSK in multi-ray environment, and the probability of biterror will almost improve5dB in the flying scene of the air channel, whose Ricianfactor and delay are6dB and6μs respectively. The frequency offset estimation schemecould acquire larger estimation of range and better estimation of quality. The estimationrange of this scheme is the same as the algorithm of L&R, when the normalized mean square error of the frequency offset could be equal to the algorithm based on the phasedifference in high signal-to-noise ratio.