Tropospheric delay in microwave propagation in Nigeria.
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Date
2018-11-30
Journal Title
Journal ISSN
Volume Title
Publisher
Advances in Space Research
Abstract
Satellite communication systems suffer from the systematic error of tropo-
spheric delay. Accurate estimation of this delay is essential for communi-
cation budget and planning. This study investigates the tropospheric de-
lay in three Nigeria cities: Abuja, Lagos, Port-Harcourt using two different
models (Saastominen and Hopfield). Three year atmospheric data for sur-
face pressure, relative humidity and temperature obtained at 5-mins interval
were acquired from the Tropospheric Data Acquisition Network (TRODAN)
archives. Computed radio refractivity values showed distinct seasonal dependence in Abuja with low and high values during the dry and wet season
respectively. The Hopfield model predicts higher hydrostatic delay values
than the Saastominen model. In the non-hydrostatic delay, the two models
converge to a single values at high temperature. Theorems were proposed
with proofs to explain the relationship observed between the two models.
Description
Staff Description
Keywords
TRODAN,, Saastominen,, Hopfield,, tropospheric delay,, radio refractivity