Prediction of In-flight Radio Frequency Attenuation by Rocket Plume Applying Diffraction Theories
Prediction of In-flight Radio Frequency Attenuation by Rocket Plume Applying Diffraction Theories
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DOI：
10.2514/1.a32223
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发表时间：
2013-09
影响因子：
1.6
通讯作者：
K. Kinefuchi;I. Funaki;T. Abe
中科院分区：
文献类型：
--
作者：
K. Kinefuchi;I. Funaki;T. Abe
在火箭飞行中，固体火箭发动机的电离羽流在一定条件下可以通过射频传输。许多文献报道，羽流周围的衍射效应是影响射频传播的主要因素。然而，由于羽流在高空广泛扩展，单刀口衍射理论，即所谓的菲涅耳衍射理论，不能准确地估计飞行中的无线电频率衰减。本文提出了一种新的绕射理论来分析飞行器与地面站之间的通信，该理论更适用于大范围扩展的羽流。用单刃衍射理论和提出的理论估算的衰减水平与飞行中记录的数据进行了比较。结果表明，本文提出的新理论与实测衰减水平相吻合。根据理论计算结果和实测数据，讨论了射频在尾焰中的传输特性，阐明了除绕射外，反射和折射都对射频传输产生影响。
In rocket flights, the ionized exhaust plume of solid rocketmotorsmay interferewith radio frequency transmission under some conditions. It has been reported in many papers that radio frequency propagation is dominated by the diffraction effect around the plume. However, because the plume widely expands at high altitudes, the single knifeedge diffraction theory, the so-called Fresnel diffraction theory, cannot accurately estimate the in-flight radio frequency attenuation. In this paper, a novel diffraction theory that would bemore suitable for the widely expanded plume is proposed to analyze the communication between a vehicle and a ground station. The attenuation levels estimatedusing the single knife-edge diffraction theory andproposed theory are comparedwith thedata recorded inflight. It is found that the new theory proposed in this paper agrees with themeasured attenuation level. Based on the theoretical results and the recorded data, the radio frequency transmission characteristics through the exhaust plume are discussed, and it is clarified that in addition to diffraction, both reflection and refraction influence the radio propagation.