Characterization and Investigation of Nonlinear Behaviour of Radio Refractivity during the Rainy and Dry Seasons in the Coastal Region of Nigeria

Abstract


 
 
 
 
 
 
 
 
 
 
 
 The transmission and receiving of good quality of signals globally has been impaired due to the internal activities of the troposphere linked to the nonlinear behaviour of the meteorological parameters. This paper focusses on characterizing and investigating the nonlinear behaviour of radio refractivity during the rainy and dry seasons in the coastal region of Nigeria using temperature, pressure and relative humidity data collected over a period of two years by the Centre for Atmospheric Research, National Space Research and Development Agency (NASRDA) from Lagos state. Data obtained were analyzed by False Nearest Neighbour (FNN) and Recurrence Quantification Analysis (RQA). The results show that recurrence techniques are able to identify the periods where there are high predictability and low predictability. The investigation of nonlinear effects of meteorological parameters and the hydrometeors on the troposphere help to avoid fading of radio signals along with the radio communication links.
 
 
 
 
 
 
 
 
 
 
 

Evaluation of the Vertical Profile of Radio Refractivity and its Gradients in a Tropical Atmosphere

“…In this paper, the vertical profile of radio refractivity and refractivity gradients is evaluated in Abuja, the Federal Capital Territory of Nigeria, a tropical country. Similar studies have been carried out in other locations in Nigeria [10][11][12][13][14][15][16][17] but there is need for continuous data update in the light of climate change.…”