外加磁场改善临近空间GPS通信研究  

Research on Improving GPS Communication Performance in Near Space by Additional Magnetic Field

作　　者：周天翔[1] 陈长兴[1] 蒋金[1] 任晓岳[1] 胡明睿 

机构地区：[1]空军工程大学理学院,西安710051

出　　处：《空军工程大学学报（自然科学版）》2016年第3期23-27,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：陕西省自然科学基础研究计划(2014JM8344)

摘　　要：针对飞行器以高超声速穿过临近空间大气层产生的通信"黑障"问题,提出了外加磁场,改变电磁环境以解决通信黑障问题的方案。依据美国RAM C提供的飞行试验数据,建立磁化等离子体鞘套模型,通过数值计算方法分析了磁场强度、等离子体厚度、等离子体碰撞频率和等离子体电子密度对GPS信号传输的反射和衰减特性。综合分析仿真表明:对处于低频段的GPS信号,通过在航天器周围添加磁场,能够明显改善电磁波在等离子体鞘套中的传输性能,当外加磁场强度大于2T时,GPS信号在等离子体鞘套中的传输衰减值均在5dB以下,有效减缓了黑障对于电磁波传输的影响,达到了较好的通信状态。Aimed at the communication blackout problem that a hypersonic aircraft passes through near space atmosphere, a method that an additional magnetic field is used to change electromagnetic environ- ments of plasma sheath is proposed. According to the data provided by radio attenuation measurement C （RAM C） voyage experiment, a model of plasma sheath is established. This paper analyzes the magnetic field intensity and parameters of plasma including plasma thickness, plasma density, plasma collision fre- quency to get the reflection and attenuation properties of GPS wave propagation in plasma sheath by nu- merical calculation. Comprehensive analysis shows that additional the magnetic field around aircraft can effectively solve the ＂communication blackout＂ problem especially directed against GPS signal in low frequency. When magnetic field intensity is over 2 T, the transmission attenuation values of GPS signal in plasma sheath are all 5 dB below. The communication state is perfect.

关 键 词：磁化 GPS 等离子体 通信黑障 

分 类 号：V271[航空宇航科学与技术—飞行器设计] TN011[电子电信—物理电子学]