1、-1-Place des Nations Telephone +41 22 730 51 11 Telex 421 000 uit ch E-mail: itumailitu.intCH-1211 Geneva 20 Telefax Gr3: +41 22 733 72 56 Telegram ITU GENEVE www.itu.intSwitzerland Gr4: +41 22 730 65 00QUESTION ITU-R 226-3/3Ionospheric and tropospheric characteristics along satellite-to-satellite p
2、aths(1997-2000-2000-2007)The ITU Radiocommunication Assembly,consideringa) that techniques exist for monitoring tropospheric and ionospheric characteristics by meansof low orbiting satellites observing GPS satellites near the Earths limb;b) that ionospheric effects along these paths may dominate ove
3、r tropospheric effects in somesituations and, for extrapolation to other scenarios, separation of these two components isnecessary;c) that intersatellite links and compatibility may be affected by the ionosphere and thetroposphere,decides that the following Question should be studied1 How does the i
4、onospheric content along satellite-to-satellite radio paths vary with slantpath, location, height, time and solar activity?2 How are intersatellite links affected by the ionosphere and troposphere?3 How can the ionospheric and tropospheric effects be separated in the results ofmeasurements on such paths?further decides1 that material in answer to decides 1 should be developed as a new Recommendation by2010.Category: S2
