Environmental Sensitivity of Large Stealth Longwave Antenna Systems
Abstract
:1. Introduction
2. Experiment Setup
3. Longtime Measurements
4. System Parameters’ Simulations
- •
- Main relation to the measured primary parameter of the loop (the inductance);
- •
- Dependence on the temperature and humidity;
- •
- Detectability by the employed measuring device.
- •
- The measured inductance values are directly related to the inductance of the components of the surrounding environment, which may change with temperature and humidity (liquid water causing ferromagnetic particle movements over a large area etc.)—Section 4.1;
- •
- The changing state of the environment (liquid water, snow, ice) may change the linear parameters of the antenna considered as a transmission line, which—given the probing frequency of the measuring device—may show the changes on the measured parameters—Section 4.2;
- •
- The functioning of the measuring device (the differentiating circuit of the digital meter) may indirectly employ a physical parameter, which is environmentally dependent and, therefore, may influence the measured parameters—Section 4.3.
4.1. Approach for The Environment’s Inductance
4.2. Transmission Line Model
4.3. Differentiating Circuit
4.4. Approach for The Electrical Permittivity
5. Results
- •
- A snow region, with a recorded intense presence of snow and temperatures lower than 1 °C;
- •
- A water region, with recorded intense rain precipitation for temperatures above 1 °C;
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- A light water region, with recorded low rain precipitation for temperatures above 1 °C.
- •
- The snow region: −5 × 10−4 T + 0.4969;
- •
- The light water region: 3 × 10−4 T + 0.4962;
- •
- The water region: −10−4 T + 0.4999.
- •
- The snow region: −2 × 10−4 T + 0.0144;
- •
- The light water region: 4 × 10−4x + 0.0315;
- •
- The water region: 10−5x + 0.0286.
6. Discussion
6.1. Comparison to IGLUNA 2019 Glacier Antennas
6.2. Comparison to Homer Tunnel Antenna Experiments (1993)
7. Conclusions
- •
- For the given antenna dimensions and probing frequency, the method of measurement by the digital meter indicated that the variability of the measured inductance can be linked to the changes in the antenna’s parasitic capacitance, and therefore to the electrical permittivity of the surrounding medium;
- •
- An increase in the environment’s humidity caused the convergence of inductance measurements to a certain value in long-time measurements;
- •
- An increase in the environment’s humidity caused an increase in the range of the measured inductance;
- •
- The parameters of the ground, when investigated separately, can be directly linked to the capacitance changes they caused and, therefore, to the changes in the measured inductance;
- •
- The defined functions of changes of measured antenna parameters for the encountered environmental factors can be considered as boundary conditions, between which other (for example, less humid or vaporised) cases are to be allocated;
- •
- Developing a precise definition of the influence of electrical permittivity on the measured antenna parameters requires precise knowledge on the parameters of the measuring circuitry;
- •
- The dependencies described in this paper are consistent with previous experiments in different locations and setups.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Condition | f [kHz] | X [Ω] | L [H] |
---|---|---|---|
Heavy rain during measurements | 19.42 | 1580 | 0.01294875 |
Rain day before measurements | 21.36 | 2252 | 0.01677982 |
No rain for 2 weeks before measurements | 21.36 | 2910 | 0.02168263 |
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Miś, T.A.; Modelski, J. Environmental Sensitivity of Large Stealth Longwave Antenna Systems. Remote Sens. 2021, 13, 3946. https://doi.org/10.3390/rs13193946
Miś TA, Modelski J. Environmental Sensitivity of Large Stealth Longwave Antenna Systems. Remote Sensing. 2021; 13(19):3946. https://doi.org/10.3390/rs13193946
Chicago/Turabian StyleMiś, Tomasz Aleksander, and Józef Modelski. 2021. "Environmental Sensitivity of Large Stealth Longwave Antenna Systems" Remote Sensing 13, no. 19: 3946. https://doi.org/10.3390/rs13193946
APA StyleMiś, T. A., & Modelski, J. (2021). Environmental Sensitivity of Large Stealth Longwave Antenna Systems. Remote Sensing, 13(19), 3946. https://doi.org/10.3390/rs13193946