Research On Adaptive Waveforms For Radar-type Communication Based On High-speed Mobile Platform

With the rapid development and progress of science and technology, the existing operational platforms are facing more and more challenges. Lots of radar and communication’s equipments are loaded against possible threats. Considering the compatibility between radar and communication systems, radar-communication integration’s research is gradually deepened for mobility and portability. Recently, radar-communication integration system has gradually penetrated to the military, civil and other fields.Based on the analysis of the similarities and differences between radar and communication, as well as the implementation mechanism, the concrete way of the radar-type communication is put forward. Then, the integration system will complete detection and information transmission by the way of time-sharing or beam-sharing. Meanwhile, its development and waveform schemes’ research status is summarized. And it shows that doppler effect caused on high-speed mobile platform isn’t taken into account. Thus, the emphasis of this thesis is to design reliable and efficient waveform schemes for radar-type communication on high-speed mobile platform.Due to doppler shift’s effect on radar-type communication, traditional anti-frequency-shift algorithms are analyzed and simulated, then DDPSK is given to resist doppler shift. Formula derivation of DDPSK’s resistance to doppler shift and noise is explained in detail. In addition, combining the practical engineering application, an improved-phase way to realize DDPSK is proposed accordingly. Then, the simulation and analysis of DDPSK is done.DDPSK combining single carrier modulation, multicarrier modulation and spread spectrum modulation is proposed as radar-type communication’s waveforms referring to IEEE802.11. For DDPSK combining single carrier modulation, the performance is analyzed when DDPSK is respectively used with BPSK, QPSK and 8PSK. For DDPSK combining multicarrier modulation, the performance is analyzed when OFDM used with DDPSK adopts different subcarrier number and baseband modulation. For DDPSK combining spread spectrum modulation, the performance is analyzed when DDPSK is respectively used with DSSS, CCK and PBCC. Besides theoretical illustration, simulation and practical tests of these waveform schemes’ resistance to doppler shift and noise are finished by Matlab and GUN Radio. Ultimately, their application conditions are given.In conclusion, different waveform schemes adopted by the integration system, have different SNR requirements and can reach different communication rates for reliable and efficient radar-type communication, and their applications are also different. Thus, integration systems select the optimal waveform adaptively according to actual situation, so as to meet the corresponding performance index of radar-type communication during high-speed mobile environment.