1、 4855232 053b5b5 957 36 Rec. ITU-R SA.1258-1 RECOMMENDATION ITU-R SA. 1258-1 SHARING OF THE FREQUENCY BAND 401-403 MHz BETWEEN THE METEOROLOGICAL-SATELLITE SERVICE, EARTH EXPLORATION-SATELLITE SERVICE AND METEOROLOGICAL AIDS SERVICE (Question ITU-R 217/7) (1997-1999) The ITU Radiocommunication Assem
2、bly, considering a satellite (MetSat) and the Earth exploration-satellite (EES) services to primary basis in the band 401-403 MHz; that the World Radiocommunication Conference (Geneva, 1997) (WRC-97) allocated the meteorological- b) basis; c) (DCS) on geostationary orbit (GSO) MetSat and non-GSO EES
3、 and MetSat; d) and climate trends which threaten life and property; e) that the band 400.15-406 MHz is currently allocated to the meteorological aids (MetAids) service on a primary that the sub-band 401-403 MHz is used for the operation of Earth-to-space iinks in data collection systems that data c
4、ollected by MetSat and MetAids operations are vital to the study and prediction of weather events sharing between MetSat, EES and MetAids services has been successful due to careful coordination, recognizing that EES and MetSat operations in the band 401-403 MHz may impact MetAids operations even if
5、 careful 1 coordination between the services is ensured; 2 do not interfere with each other at the current stage of deployment; 3 in fiequency can be accomplished; that distance andor Cequency separation can be used to ensure that EES, GSO MetSat and MetAids operations that co-channel sharing is not
6、 possible between non-GSO EES and either MetSat or MetAids, but coordination -_. A 5 result in higher levels of interference between MetAids, EES and MetSat services, that MetAids and MetSatEES services use of the band is increasing; that any reduction in spectrum available to the MetAids service in
7、 order to accommodate other services will recommends 1 that co-channel sharing is feasible between GSO MetSat and MetAids services in the band 401-403 MHz only in locations where the spatial density of data collection platforms is low and where they meet the following conditions: uplink e.i.r.p. den
8、sity limitations of 22 dB(WA00 Hz) and transmission durations of up to 1 min per message; 2 non-GSO MetSat services on the other in the band 401-403 MHz; 3 operators, MetSat and EES operators prior to implementation. that co-channel sharing is not feasible between the MetAids service on the one hand, and non-GSO EES, or that systems which do not meet the restrictions of recommends 1 require coordination between MetAids
