QUESTION ITU-R 84-4/4*Use of non-ge

QUESTION ITU-R 84-4/4*
Use of non-geostationary-satellite orbits in mobile-satellite services
(1988-1990-1992-1993-2007)
The ITU Radiocommunication Assembly,
considering
a) that various types of non-geostationary-satellite orbits can provide global coverage within latitudes between the 90° parallels utilizing configurations suitable for a variety of satellite communication applications;
b) that studies should continue to be carried out in the ITU-R to establish guidelines for sharing within the mobile-satellite service (MSS), and between MSS and other services;
c) that use of orbits other than geostationary for some mobile-satellite applications could provide better coverage for areas above certain latitudes and in general provide improved services because of shorter path links and also facilitate joint use with other services, e.g., the radiodetermination services;
d) that elevation angles to the geostationary orbit are very low from higher latitudes which accentuates the communication problems caused by multipath and shadowing effects. The use of orbits other than geostationary may improve this situation;
e) that such systems operating in different frequency bands may have distinctly different characteristics,
decides that the following Questions should be studied
1 What types of non-geostationary-satellite orbits are suitable for providing mobile-satellite services?
2 What are the technical and operational advantages and limitations of those non-geostationary-satellite orbits, and the systems utilizing them?
3 Subsequently to the studies in accordance with decides 1 to 3, what technical specifications should be provided to meet the objective of considering c)?
further decides
1 that the results of the above studies should be included in appropriate Recommendations and/or Reports;
2 that the above studies should be completed by 2014.

Category: S2

Kết quả (Anh) 1:

QUESTION ITU-R 84-4/4 *Use of non-geostationary-satellite it orbits in mobile-satellite services(1988-1990-1992-1993-2007)The ITU Radiocommunication Assembly,consideringa) that various types of non-geostationary-satellite it orbits can provide global coverage within latitudes between the 90° parallels utilizing configurations suitable for a variety of satellite communication applications;b) that studies should continue to be carried out in the ITU-R to establish guidelines for sharing within the mobile-satellite service (MSS), and between MSS and other services;c) that use of it orbits other than geostationary for some mobile-satellite applications could provide better coverage for areas above certain latitudes and in general provide improved services because of shorter path links and also facilitate joint use with other services, e.g., the radiodetermination services;d) that elevation angles to the geostationary orbit are very low from higher latitudes which accentuates the communication problems caused by multipath and shadowing effects. The use of it orbits other than geostationary may improve this situation;e) that such systems operating in different frequency bands may have distinctly different characteristics,Decides that the following Questions should be studied1 What types of non-geostationary-satellite it orbits are suitable for providing mobile-satellite services?2 What are the technical and operational advantages and limitations of those non-geostationary-satellite it orbits, and the systems utilizing them?3 Subsequently to the studies in accordance with decides 1 to 3, what technical specifications should be provided to meet the objective of considering c)?Further decides1 that the results of the above studies should be included in appropriate Recommendations and/or Reports;2 that the above studies should be completed by 2014.Category: S2

Kết quả (Anh) 2:

QUESTION ITU-R 84-4 / 4 *
Use of non-geostationary-satellite orbits in mobile-satellite services
(1988-1990-1992-1993-2007)
The ITU Radiocommunication Assembly,
considering
a) That Various types of non-geostationary- satellite orbits can cung global coverage trong the between latitudes 90 ° parallels utilizing the configurations Suitable for a variety of satellite communication applications;
b) That shouldnt studies continue to be Carried out in the ITU-R to lập guidelines for sharing mobile-satellite service trong (MSS), and the between MSS and other services;
c) That use of geostationary orbits coal for some other mobile-satellite applications không cung Certain better coverage for latitudes above which areas and improved services in general cung vì shorter path links and am also facilitate joint use with other services, eg, the radiodetermination services;
d) is elevation angles to the geostationary orbit are very low from Higher latitudes mà accentuates the communication problems caused by multipath and shadowing effects. The use of geostationary orbits khác this garment Improve Situation;
e) is vd systems operating in frequency bands khác unfortunately have distinctly khác characteristics,
Decides That shouldnt be studied sau Questions
1 What types of non-geostationary-satellite orbits are Suitable for Providing mobile-satellite services?
2 What are the technical and operational Advantages and limitations of non-geostationary-satellite những orbits, and the systems utilizing add?
3 Subsequently to the studies in accordance with Decides 1 to 3, what technical specifications provided to nên meet the objective of considering c)?
Further Decides
1 là results of the above studies be included in the appropriate shouldnt Recommendations and / or Reports;
2 That the above studies shouldnt be completed by 2014. Category: S2