13Additional information on meteorological-satellite service protection

13 Additional information on meteorological-satellite service protection

(1) Information on the prediction of appropriate coordination distances, propagation models, threshold coordination levels and earth receive station and antenna characteristics, which may assist in assessing compliance with interference criteria, is available from the following: (a) ITU-R Recommendation SA.1027 “Sharing criteria for space-to-Earth data transmission systems in the Earth exploration-satellite and meteorological-satellite services using satellites in low-Earth orbit”; (b) ITU-R Recommendation SA.1158 “Feasibility of frequency sharing in the 1 670-1 710 MHz band between the meteorological-satellite service (space-to-Earth) and the mobile-satellite service (Earth-to-space)”; (c) ITU-R Recommendation SA.1161 “Sharing and coordination criteria for data dissemination and direct data readout systems in the Earth exploration-satellite and meteorological-satellite services using satellites in geostationary orbit”.

Note: ITU-R Recommendations SA.1027, SA.1158 and SA.1161 are available, free of charge, from the International Telecommunication Union’s website at www.itu.int.

(2) Subsections (3) to (7) may also assist in assessing compliance with interference criteria. (3) The main source of interference will be from a mobile transmitter operating in the 1800 MHz lower band, caused by either in-band or out-of-band emissions. The probability of interference depends not only on physical proximity to an earth receive station, but also network configuration and operation, such as the EIRP of the mobile transmitter (which will depend on cell size and the location of the mobile transmitter, relative to the base station). (4) Liaison is encouraged between spectrum licensees and operators of earth receive stations in the meteorological-satellite service to determine additional details about specific sites that may assist in coordination, including the following: (a) the nature of the transmission of the meteorological-satellite service (for example, recorded data playback or direct data readout) and type of satellite orbit (GSO or NGSO); (b) the earth receive station antenna azimuth and elevation, or minimum elevation angle; (c) the earth receive station radiofrequency and intermediate frequency bandwidth and response (including any additional filtering that may be installed); (d) the earth receive station antenna height and gain (if not available from the Register). (5) If the antenna radiation pattern of an earth receive station in the meteorological-satellite service is unavailable, ITU-R Recommendation SA.465 “Reference radiation pattern for earth station antennas in the fixed-satellite service for use in coordination and interference assessment in the frequency range 2 to 31 GHz” may be used for coordination, even though the earth receive station operates outside the frequency range for that document.