Phase synchronization between tropospheric radio refractivity and rainfall amount in a tropical region

Fuwape, I. A.; Ogunjo, Samuel; Dada, Joseph Babatunde; Ashidi, Ayodeji Gabriel; Emmanuel, Israel

doi:10.1016/j.jastp.2016.09.009

Cited by 23 publications

(8 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The independent variable x , is said to Granger cause the dependent variable y , if there exists a suitable lag, q such that (Granger, 1969 ; I. A. Fuwape et al., 2016 )

…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Association Between Weather Parameters and SARS‐CoV‐2 Confirmed Cases in Two South African Cities

2022

View full text Add to dashboard Cite

Several approaches have been used in the race against time to mitigate the spread and impact of COVID‐19. In this study, we investigated the role of temperature, relative humidity, and particulate matter in the spread of COVID‐19 cases within two densely populated cities of South Africa—Pretoria and Cape Town. The role of different levels of COVID‐19 restrictions in the air pollution levels, obtained from the Purple Air Network, of the two cities were also considered. Our results suggest that 26.73% and 43.66% reduction in PM2.5 levels were observed in Cape Town and Pretoria respectively for no lockdown (Level 0) to the strictest lockdown level (Level 5). Furthermore, our results showed a significant relationship between particulate matter and COVID‐19 in the two cities. Particulate matter was found to be a good predictor, based on the significance of causality test, of COVID‐19 cases in Pretoria with a lag of 7 days and more. This suggests that the effect of particulate matter on the number of cases can be felt after 7 days and beyond in Pretoria.

show abstract

“…The independent variable x , is said to Granger cause the dependent variable y , if there exists a suitable lag, q such that (Granger, 1969 ; I. A. Fuwape et al., 2016 )

…”

Section: Methodsmentioning

confidence: 99%

“…The independent variable x , is said to Granger cause the dependent variable y , if there exists a suitable lag, q such that (Granger, 1969; I. A. Fuwape et al., 2016)

{y}_{t}={\beta }_{0}+\sum\limits _{j=1}^{q}{c}_{j}{x}_{t-j}+\sum\limits _{k=1}^{q}{d}_{k}{y}_{t-k}

…”

Section: Methodsmentioning

confidence: 99%

Association Between Weather Parameters and SARS‐CoV‐2 Confirmed Cases in Two South African Cities

2022

View full text Add to dashboard Cite

show abstract

“…The propagation impairments of radio wave signals whose frequencies exceed 10 GHz are predominantly caused by the tropospheric constituents that spread between the Earth's surface and an altitude of about 10-20 km, the vertical extent being lowest at the temperate and highest in the tropical regions (Matricciani et al 1996;Adediji and Ajewole 2010;Fuwape et al 2016). Degradations induced in the ionosphere (50-100 km) generally affect frequencies well below 10 GHz, implying that the ionosphere is transparent to radio waves that nears or exceeds 10 GHz in frequency.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Concurrent Variation in Rain Specific Attenuation and Tropospheric Amplitude Scintillation Over Akure, Southwest Nigeria

et al. 2021

View full text Add to dashboard Cite

Rain constitutes a major limitation to the performance and use of terrestrial and satellite communication systems with operational frequencies greater than 10 GHz. The situation gets further complicated by fast fluctuations in the received signal amplitude due to in homogeneities in atmospheric weather conditions; a phenomenon known as amplitude scintillation. The concurrent evaluation of the two phenomena guarantees a better fade margin determination for the planning of radio communication over any location. This work employs 3 years of in-situ measurement of temperature, humidity, rainfall rate and rainfall amount for the estimation of tropospheric amplitude scintillation and rain specific attenuation over Akure (7.17° N, 5.18° E, 358 m) South West Nigeria. Davis vantage pro weather station at 1-min integration time was used for the measurement and the ITU models for rain specific attenuation (ITU-R P.838-3) and amplitude scintillation (ITU–R 618-13) were employed for the estimation. Time series and statistical analyses of the phenomena show that rain attenuation is the more prominent cause of signal degradation at Ku-band frequencies. Nevertheless, the need to make an extra fade margin allowance of about 0.25 dB due to amplitude scintillation fade subsists to forestall any loss of synchronization on the link. Also, a 3-parameter power-law expression developed for estimating amplitude scintillation fade from rain attenuation performed excellently well, as indicated by average root mean square error (RMSE) and coefficient of determination (R2) values of 0.002151 and 0.8747, respectively.

show abstract

“…This was soon extended to discrete systems to explain the behaviour in natural systems and models especially population models [7]. Many methods used in integer order and discrete systems have been developed over the years to study observational data such as climate [9], economic and financial data [11] and communication systems [8].…”

Section: Introductionmentioning

confidence: 99%

Bifurcation analysis and chaos control of periodically driven discrete fractional order memristive Duffing Oscillator

Ogunjo¹,

Fuwape²

2019

Preprint

Self Cite

View full text Add to dashboard Cite

Discrete fractional order chaotic systems extends the memory capability to capture the discrete nature of physical systems. In this research, the memristive discrete fractional order chaotic system is introduced. The dynamics of the system was studied using bifurcation diagrams and phase space construction. The system was found chaotic with fractional order 0.465 < n < 0.562. The dynamics of the system under different values makes it useful as a switch. Controllers were developed for the tracking control of the two systems to different trajectories. The effectiveness of the designed controllers were confirmed using simulations.

show abstract

Phase synchronization between tropospheric radio refractivity and rainfall amount in a tropical region

Cited by 23 publications

References 26 publications

Association Between Weather Parameters and SARS‐CoV‐2 Confirmed Cases in Two South African Cities

Association Between Weather Parameters and SARS‐CoV‐2 Confirmed Cases in Two South African Cities

Evaluation of Concurrent Variation in Rain Specific Attenuation and Tropospheric Amplitude Scintillation Over Akure, Southwest Nigeria

Bifurcation analysis and chaos control of periodically driven discrete fractional order memristive Duffing Oscillator

Contact Info

Product

Resources

About