Principal component analysis of sub-ionospheric propagation conditions
Principal component analysis of sub-ionospheric propagation conditions
- Author(s): A.B. Collier
- DOI: 10.1049/cp.2009.0041
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- Author(s): A.B. Collier Source: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009), 2009 p. 86 – 90
- Conference: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009)
- DOI: 10.1049/cp.2009.0041
- ISBN: 978 1 84919 123 4
- Location: Edinburgh, UK
- Conference date: 28-30 April 2009
- Format: PDF
Very Low Frequency (VLF) waves propagate with insignificant attenuation in the Earth-ionosphere waveguide. Attenuation is, however, relatively higher on illuminated paths due to the presence of the ionospheric D region. Sub-ionospheric propagation conditions may be monitored using a narrowband receiver tuned to the stable signals from numerous VLF transmitters distributed across the surface of the Earth. The passage of the day-night terminator across the transmitter-receiver path has a characteristic signature in the amplitude and phase of the signal. Principal Component Analysis (PCA) was applied to distinguish between this regular diurnal pattern and exogenous perturbations.
Inspec keywords: principal component analysis; ionospheric electromagnetic wave propagation; electromagnetic wave scattering; radiowave propagation
Subjects: Radiowave propagation; Ionospheric electromagnetic wave propagation; Probability theory, stochastic processes, and statistics; Other topics in statistics
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