tailieunhanh - Satellite Communications Part 10

Tham khảo tài liệu 'satellite communications part 10', 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 261 ----- 2006 ----- 2007 -----2008 Percentage of time Fig. 10. Cumulative distribution of measured rain rate ----2008 ---- 2007 ----2006 Fig. 11. Cumulative distribution of rain attenuation Fig 10 and Fig 11 show the annual cumulative distribution of rain rate and rain attenuation for three years 2006-2008 respectively. Table 1 shows the record of rain rate and rain attenuation at point of time and maximum point for the year 2006 2007 2008. 262 Satellite Communications Year Rain Rate. mm h Rain Attenuation dB At point Maximum At point Maximum 2006 100 180 17 29 2007 110 210 18 31 2008 160 270 28 31 Table 1. The record of rain rate and rain attenuation at point of time and maximum point for the year 2006 2007 2008 6. Worst Month Statistics Worst month distribution of rain attenuation is defined as the highest rain attenuation within a set of individual monthly distributions of rain attenuation for one year. Rain attenuation data for year 2006 2007 and 2008 at USM was analyzed. In planning of the design of reliable communication systems the required statistics of propagation effects is relevant to the worst month reference. On the other hand the reference statistics for several propagation prediction methods are the long term average annual distribution. Therefore the conversion of the yearly statistic to the worst month is important. The annual and worst-month rain attenuation exceedance curve is shown in Fig 14 and Fig 16 for year 2006 2007 and 2008 respectively. The worst month for 2006 2007 and 2008 were November October and March respectively. The Q factor as a function of annual percentage of exceedance for Ku-band rain attenuation is shown in Fig 15 and Fig 17 for year 2006 2007 and 2008 respectively. Fig. 12. The annual and worst-month rain attenuation exceedance curve at Ku-band for year 2006 Earth to space link 263 Measured ITU -----Power Measured Annualexceedance Y Fig. 13. The Q factor as a function .

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