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Telecommunications and Radio Engineering

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ISSN Print: 0040-2508

ISSN Online: 1943-6009

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SPATIO-TEMPORAL VARIATION OF NONLINEARITY IN TROPOSPHERIC ZENITH WET DELAY OVER WEST AFRICA

Volume 79, Issue 11, 2020, pp. 1009-1016
DOI: 10.1615/TelecomRadEng.v79.i11.100
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ABSTRACT

Quantification of uncertainty in tropospheric zenith wet delay is important for planning a satellite communication link budget. The objective of this study is to determine the spatiotemporal variation of wet delay within the West African region using chaos theory. Evidence of chaos in wet delay will imply a short prediction horizon. Wet delay from January 1981 to December 2010 was computed using the Saastamoinen model. Seasonal variation was observed in wet delay over the region with high values along the coastal regions during the dry season. Using determinism and approximate entropy, the coastal regions of West Africa were found to exhibit chaos which reduces in intensity towards the north of Africa. Wet delay values in the inland region of West Africa possess short term memory while specific regions along the coast show long term memory. Our findings show that long term prediction of wet delay along the coast of West Africa will pose a great challenge for planning the communication link budget.

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CITED BY
  1. Ogunjo S.T., Dada J.B., Ajayi O.J., Forecasting tropospheric wet delay using LSTM neural network, IOP Conference Series: Earth and Environmental Science, 993, 1, 2022. Crossref

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