Radio Refractivity Study in Akure-Owo Digital Microwave Link in South Western Nigeria

Abstract

This work is a study of radio refractivity in Akure This work is a study of radio refractivity in Akure This work is a study of radio refractivity in Akure This work is a study of radio refractivity in Akure-Owo Digital Microwave Link in South Western Nigeria. Owo Digital Microwave Link in South Western Nigeria. Owo Digital Microwave Link in South Western Nigeria. Owo Digital Microwave Link in South Western Nigeria. Meteorological data of air temperature, atmospheric pressure, relative humidity, and water vapour Meteorological data of air temperature, atmospheric pressure, relative humidity, and water vapour Meteorological data of air temperature, atmospheric pressure, relative humidity, and water vapour Meteorological data of air temperature, atmospheric pressure, relative humidity, and water vapour pressure were pressure were pressure were pressure were measured between January and December 2006 at the observatory centre of the Nigerian meteorological agency measured between January and December 2006 at the observatory centre of the Nigerian meteorological agency measured between January and December 2006 at the observatory centre of the Nigerian meteorological agency measured between January and December 2006 at the observatory centre of the Nigerian meteorological agency (NIMET) situated (NIMET) situated (NIMET) situated (NIMET) situated at Akure at Akure at Akure at Akure Airport. Airport. Airport. Airport. Th Th Th The meteorological data collected were computed to obtain the refractivity, e meteorological data collected were computed to obtain the refractivity, e meteorological data collected were computed to obtain the refractivity, e meteorological data collected were computed to obtain the refractivity, refractivity gradient and earth radius factor. refractivity gradient and earth radius factor. refractivity gradient and earth radius factor. refractivity gradient and earth radius factor. The The The The results of the study show results of the study show results of the study show results of the study show that the refractivity gradient was greater that the refractivity gradient was greater that the refractivity gradient was greater that the refractivity gradient was greater than zero and vary slightly throughout the months of the year than zero and vary slightly throughout the months of the year than zero and vary slightly throughout the months of the year than zero and vary slightly throughout the months of the year 2006. The highest value of refractivity gradient was 2006. The highest value of refractivity gradient was 2006. The highest value of refractivity gradient was 2006. The highest value of refractivity gradient was in April and lowest value in September, the effective earth radius factor was observed to be less than one which in April and lowest value in September, the effective earth radius factor was observed to be less than one which in April and lowest value in September, the effective earth radius factor was observed to be less than one which in April and lowest value in September, the ef...

Seasonal and latitudinal variations of surface radio refractivity over Nigeria

“…The troposphere, also called the lower atmosphere is the area of the atmosphere that reaches heights of 8 to 10 kilometers at arctic latitudes, 10 to 12 kilometers at mild latitudes, and 16 to 18 kilometers at the equator [2]. It is in the layer of the atmosphere that the majority of the meteorological events happen, such as rain, hurricanes, lightning, cyclones, snows, and fronts [3]. In the troposphere, the percentage of the gas components does not vary with height.…”

“…Researchers in Nigeria, such as [1], [3], [13], [15]- [22] have worked on the effect of atmospheric factors on radio propagation, but latitudinal variations of some specific locations considered in this work have not been dealt with extensively considering the two major seasons usually experience in Nigeria.…”

“…A widely established relationship for atmospheric refractivity index dependency on the pressure, the temperatures, and the water vapour are expressed as (3).…”

Comparative Analysis of Tropospheric Radio Refractivity during Rainy Season in Calabar, Nigeria

“…Therefore evaluating temperature variation is important in predicting radio signal propagation [3]. It is widely agreed that variations in pressure, temperature and relative humility within the troposphere causes changes in the refractive index of air which can affect the propagation of signals [4]. There are several researches on the variation of radio refractivity in Nigeria.…”

“…There are several researches on the variation of radio refractivity in Nigeria. [4] Investigated the radio refractivity in Akure, south west Nigeria and concluded that the refractivity gradient was greater than zero and vary slightly throughout the months of the year. [2] Studied surface radio refractivity in Akwa, south eastern Nigeria.…”