Research On Modeling Of Relay Dual-Polarization MIMO Channel For Nearspace Hypersonic Vehicles

Nearspace hypersonic vehicles have broad application prospect in intelligence gathering,reconnaissance,communication support,surveillance,navigation and early warning,due to its unique spatial advantages.However,the substantial attenuation of the communication signal will occur,which results from the plasma sheath formed on the surface of the nearspace vehicle flying at hypersonic speed.Moreover,when the signal attenuates to some extent,the ongoing communication will be interrupted,which is also called “blackout”.Therefore,it is vital for alleviating the problem of "blackout" to analyze the impact of plasma sheath environment on communication and then design an optimized scheme to improve communication quality,through both the analysis of the influence of plasma sheath environment on wireless propagation characteristics and the construction of an accurate channel model.Currently,most published researches aimed at the channel modeling for a hypersonic vehicles equipped with a single Polarization antenna,however,its corresponding Single Input Single Output(SISO)channel capacity is relatively low.On the other hand,dual-polarized antennas has obtained wide concern,and its application into hypersonic vehicles can effectively improve the channel capacity through the MIMO(Multiple Input Multiple Output)channel.Therefore,this paper studies the synthesized channel modelling of uplink relay near-space hypersonic vehicles with dual-polarization MIMO technique.The surrounding plasma sheath environment influences the depolarizing of the MIMO channel,and moreover influences the attenuation of signal power of the left/right circularly polarized wave.Therefore,on studying the synthesized channel modelling of uplink relay near-space hypersonic vehicles with dual-polarization MIMO technique,the paper mainly analyzed the influence of the plasma sheath environment and moreover validated the improvement of the dual-polarization MIMO technology on the channel capacity under the influence of the plasma sheath.The main contributions of this paper are as follows:1.This paper proposed a dual-polarization MIMO communication scheme for the uplink scenario of nearspace hypersonic vehicles and relay satellites.Moreover,the paper studies the synthesized channel modelling for near-space hypersonic vehicles with relay dualpolarization MIMO technique,taking into account the influences of atmospheric propagation environment on the channel correlation and the communication signal power.2.This paper analyzed the influence of the Plasma sheath channel environment on circular polarization parameters XPC and signal transmission power under the condition of different flight heights and incident angles of circular polarization waves.Moreover,the paper formulated the synthesized channel model of near-space hypersonic vehicles with dualpolarization MIMO,and then constructed the mapping relationship between the channel capactiy and the light heights and incident angles.As simulation results showed,compared with the traditional SISO communication scheme,the proposed dual-polarization MIMO scheme can effectively improve the channel capacity,alleviate the “blackout” problem from the Plasma sheath,and provide theorectical references for the optimization of the communication link capacity.