外加磁场改善临近空间GPS通信研究
发布时间：2018-12-08 20:48
【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。
[Abstract]:In order to solve the problem of communication "black barrier" caused by the aircraft passing through the adjacent space atmosphere at hypersonic speed, the scheme of applying magnetic field to change the electromagnetic environment to solve the problem of communication black barrier is put forward. Based on the flight test data provided by RAM C of the United States, a model of magnetized plasma sheath was established. The magnetic field intensity and plasma thickness were analyzed by numerical method. The reflection and attenuation characteristics of plasma collision frequency and plasma electron density on GPS signal transmission. Comprehensive analysis and simulation show that the transmission performance of electromagnetic wave in plasma sheath can be improved obviously by adding magnetic field around spacecraft for GPS signal at low frequency. When the applied magnetic field intensity is greater than 2T, The propagation attenuation of GPS signal in plasma sheath is below 5dB, which can effectively slow down the influence of black barrier on electromagnetic wave transmission and achieve a better communication state.
【作者单位】： 空军工程大学理学院;
【基金】：陕西省自然科学基础研究计划(2014JM8344)
【分类号】：V443.1
本文编号：2368977
[Abstract]:In order to solve the problem of communication "black barrier" caused by the aircraft passing through the adjacent space atmosphere at hypersonic speed, the scheme of applying magnetic field to change the electromagnetic environment to solve the problem of communication black barrier is put forward. Based on the flight test data provided by RAM C of the United States, a model of magnetized plasma sheath was established. The magnetic field intensity and plasma thickness were analyzed by numerical method. The reflection and attenuation characteristics of plasma collision frequency and plasma electron density on GPS signal transmission. Comprehensive analysis and simulation show that the transmission performance of electromagnetic wave in plasma sheath can be improved obviously by adding magnetic field around spacecraft for GPS signal at low frequency. When the applied magnetic field intensity is greater than 2T, The propagation attenuation of GPS signal in plasma sheath is below 5dB, which can effectively slow down the influence of black barrier on electromagnetic wave transmission and achieve a better communication state.
【作者单位】： 空军工程大学理学院;
【基金】：陕西省自然科学基础研究计划(2014JM8344)
【分类号】：V443.1
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