Integrating microwave links data for analysis of solar radiation in Nablus, Palestine
An-Najah National University
The main goal of this research is to develop an indirect method for solar radiation estimation using integrated data from MW-Link. Additionally, it also aims to estimate the rainfall rate and relative humidity from the attenuation caused for MW-Link received signal level. The solar radiation, rainfall rate and relative humidity estimates from the MW-Link signals are compared with on ground measurements at Nablus meteorological station. The historical data of rainfall rate, relative humidity and solar radiation were obtained from the Palestinian Meteorological Department (PMD). Beside to rainfall and relative humidity estimates, solar radiation was estimated from MW-Link measurements using regression analysis. The MW-Link used as an environmental sensor which can be used to estimate meteorological data precisely at low cost compared with conventional measurement techniques. The measurements were taken over one geographical region in Palestine which is located in Nablus City. The attenuation measurements from March of 2015 to March of 2016 were taken from commercial MW-Link of JAWWAL. The rainfall rate measurements from MW-Link were estimated from the received signal level (RSL) during rainy periods. This attenuation occurred on the received signal level has been converted to rainfall rate data using a mathematical model which is explaining the relationship between rainfall rate and electromagnetic attenuation. The same procedure had been used to estimate relative humidity using special model which is explaining the relationship between relative humidity and electromagnetic attenuation and taking into account the RSL measured during time periods with no rain. Finally, regression analysis was applied to solar radiation, rainfall rate and relative humidity data to obtain solar radiation data. Rainfall rate and relative humidity estimates taken from the MW-Link were very almost similar to the records obtained from PMD with a correlation coefficient R^2 of 0.95 and 0.70 for rainfall rate and relative humidity respectively. The solar radiation measured from the model developed was very almost similar to the measurements provided by the PMD with a correlation coefficient of R^2=0.89.