tailieunhanh - Satellite Communicationsever increasing widespread Part 9

Tham khảo tài liệu 'satellite communicationsever increasing widespread part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Earth to space link 271 Fig. 25. Comparison of one minute rain rate prediction models with measured data for USM site. Bangkok Measured Moupfouma .ITU ------KIT ------RH ------DD Percentage of time Fig. 26. Comparison of one minute rain rate prediction models with measured data for Bangkok site. 272 Satellite Communications ------Bandung Measured Moupfouma .ITU ------KIT ------RH _Percentage of time _ Fig. 27. Comparison of one minute rain rate prediction models with measured data for Bandung site. Fig. 28. Comparison of one minute rain rate prediction models with measured data for Manila site. Earth to space link 273 Fig. 29. Comparison of one minute rain rate prediction models with measured data for Fiji site. The Moupfouma model overestimates the one minute rain rate from to 1 of time and underestimates the rain rate from to at USM sites. The model gave a RMS value of for USM. This is because the model has a probability law behavior that underlines the complexity of the rain rate distribution according to the climate of the zone of interest. For Bangkok Bandung Manila and Fiji sites the model follows closely the measured rain rate values throughout the entire percentage of time that the rain rate is exceeded. The model gave a low RMS value for those tropical sites. The model s RMS values were 53 Bangkok Bandung Manila and Fiji . The coefficients of Ấ and Y values from the slope of rain rate curve in equation depend strongly on the measured rain rate data. For tropical and sub-tropical localities X and Y are used in calculation of rain rate cumulative distribution slopes. The ITU-R model overestimates the one minute rain rate from to 1 of time and underestimates the rain rate from to at USM sites. The model gave a RMS value of for USM. For Bangkok Bandung Manila and Fiji sites the model follows closely the measured rain rate values up to .