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By Borovikov V. A.

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Maritime mobile service 15. Maritime radio navigation 16. Meteorological aids service 17. Meteorological satellite service 18. Mobile excerpt aeronautical service 19. Mobile satellite service 20. Mobile service 21. Radio astronomy 22. Radio determination satellite 23. Radio location 24. Radio navigation 25. Radio navigation satellite 26. Secondary (non-satellite) service 27. Secondary (satellite) service 28. Space operation service 29. Space research service 30. Standard frequency & time signal 31.

8. 4. Also, atmospheric pressure depends on the location (latitude) and the date (the season of the year) in addition to the height. 8 Tropospheric Propagation 15 Fig. 0 − anymore. 5 g/m3 are similar to the atmospheric pressure; the water vapor pressure also depends on the location, height, and the season of the year. It should be noted that the water vapor pressure decreases exponentially as height increases up to a particular value of the height. 16 1 Introduction to Radiowaves Propagation To calculate attenuation caused by other atmospheric gases, similar procedure may be followed with h0 = 6 km.

Considering these facts, recognition, study, and survey of these phenomena are very important and have been thoroughly investigated in Chap. 3 of “Propagation Engineering in Wireless Communications” complete with some useful tables and graphs related to this topic. Basically, the wave propagation phenomena are affected by one or a set of the following main factors: • The Earth and its natural and physical properties such as bulge, roughness, structure, material, and flatness. • Environmental conditions such as temperature, humidity, stable atmosphere composition, and air molecules such as oxygen, nitrogen, and water vapor.

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