中继法解决临近空间Ka波段通信黑障问题

A Research on Communications Blackout Problem in Ka-Band by Relay Method

为解决航天器在临近空间的通信黑障问题,根据ARD等实测数据,分别建立再入航天器迎风面、背风面均匀等离子鞘套模型,分析再入航天器迎风面、背风面的等离子鞘套厚度、电子密度、等离子体碰撞频率等参数对Ka波段的传输透射率、反射率和衰减值的影响。分析结果表明:Ka波段工作信号在航天器背风面传输显著优越于在航天器迎风面传输,在航天器再入过程中,提高信号通信频段以及Ka波段工作信号从背风面传输的透射率相比从迎风面传输的透射率至少提高88%,衰减值至少降低19dB,为研究再入航天器通信问题提供了理论参考。

To solve the reentry spacecraft communications blackout problem,this paper establishes a uni- form plasma sheath model of reentry spacecraft on windward and leeward respectively in light of experi- ment data like ARD, and analyzes the effects of frequency parameters such as the thickness, electron den- sity and plasma collision of plasma sheath of reentry spacecraft on windward and leeward to the transmis- sion of Ka-band. The result shows that the transmission of Ka-band signals on leeward is significantly su- perior to that on windward, and the transmission of Ka-band signals on leeward increases by at least 88%, and the attenuation value decreases by at least 19 dB,compared to that on windward. This provides a theo- retical reference for researching the reentry spacecraft in communication problems.