Abstract
This paper discusses the risks associated with an aerostat-supported stratospheric (unanchored) balloon mission equipped with a long vertical antenna and a very low frequency radio transmitter. The risks have been grouped into four main types and applicable mitigation methods have been presented to provide a sufficient level of safety and reliability to such a balloon mission. An experimental mission consistent with this analysis, based on the described theoretical VLF propagation approach, has been prepared and launched, and is operating at 14.2 kHz with a vertical antenna of a total length of 400 m and a total payload of max. 4 kg. The maximum altitude reached 29,164 m. The experiment’s signal has been registered in numerous locations in Europe; the results are compared with numerical analysis employing a hypothesis of an apparent transmitting frequency decrease with the rise of the transmitter’s altitude. The numerical analysis explains the behavior of the experimental signal and remains generally consistent with the hypothesis.
Funder
Foundation for the Development of Radiocommunication and Multimedia Technologies
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Reference64 articles.
1. Bulletin, B. (2018). Reference Signals, Frequency and Time, VNIIFTRI.
2. Kirsch, R. (2009). Groundwater Geophysics: A Tool for Hydrogeology, Springer. [2nd ed.].
3. Thierry, A. (2021, May 20). Simple Earth-Ionosphere Waveguide Calculation. Available online: www.vlf.it/thierry/waveguide_propagation.html.
4. Long-Term Evolution of the Occurrence Rate of Magnetospheric Electron Precipitation into the Earth’s Atmosphere;Bazilevskaya;Bullettin Russ. Acad. Sci. Phys.,2019
5. Watt, A.D. (1967). VLF Radio Engineering, Pergamon Press Inc.
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