核电磁脉冲在电离层中的色散传播

IF 2.6 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Yongli Wei, Dinghan Zhu, Zongxiang Li, Lihua Wang, Yuan Wang, Tianchi Zhang, Bin Xing, Baofeng Cao, Peng Li
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引用次数: 0

摘要

导读:在向卫星传播的路径上,电离层会使核电磁脉冲(NEMP)发生畸变,改变其物理性质。方法:提出了一种计算NEMP向卫星传播的方法。该方法将NEMP分解为简单谐波的叠加,并在电离层中单独计算每个简单谐波。考虑到电离层到达时间和临界频率的不同,在电离层中传播后的NEMP是通过简谐波在时域上的叠加来获得的,而不是通过傅里叶反变换来消除时域信息。结果:NEMP在电离层中具有色散特性,脉冲宽度变宽,速度改变,带宽变窄。时频谱可以提供信号能量所在的频带。讨论:本文提出的方法为NEMP在电离层的传播提供了一种简单有效的计算方法,可为NEMP接收机的设计和卫星轨道高度的选择提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dispersive propagation of nuclear electromagnetic pulse in the ionosphere
Introduction: On the propagation path to the satellite, the ionosphere will distort the nuclear electromagnetic pulse (NEMP) and change its physical properties. Methods: This paper proposes a method for calculating the propagation of NEMP to the satellite. The method decomposes NEMP into the superposition of simple harmonic waves, and each simple harmonic wave is calculated separately in the ionosphere. With the consideration of different time of arrival and critical frequency of the ionosphere, the NEMP after propagating in the ionosphere is obtained by superposition of simple harmonic waves in time domain rather than the inverse Fourier transform which will erase the time domain information. Results: The results show that NEMP is dispersive in ionosphere with the pulse broadened, the speeds changed and the bandwidth narrowed. The time-frequency spectrum can provide the frequency band where the signal energy is located. Discussion: Our proposed method provides a simple and effective way to calculate the NEMP propagation in the ionosphere, which should afford help to the design of NEMP receivers and the selection of satellite orbit altitude.
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来源期刊
Frontiers in Astronomy and Space Sciences
Frontiers in Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-
CiteScore
3.40
自引率
13.30%
发文量
363
审稿时长
14 weeks
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