1、40 Rec. ITU-R M.1178 RECOMMENDATION ITU-R M.1178* USE OF THE MARITIME RADIONAVIGATION BAND IN REGIONS 2 AND 3) (Question ITU-R 20318) (283.5-315 kk IN REGION 1 AND 285-325 HZ ( 1995) Summary The ITU-R has carried out initiai studies of the technical factors, bandwidth, modulation method, protection
2、ratios and sharing criteria of maritime radionavigation systems, including the transmission of differential corrections for Global Navigation Satellite Systems (GNSS), that could coexist with maritime radiobeacons without degrading radiobeacon operations. This Recommendation describes where the nece
3、ssary information can be found to ensure compatible operation, in this frequency band, of radiobeacons, differentid transmissions for GNSS and a hyperbolic maritime radionavigation system. It also recommends that more efficient use could be made of the band by allowing the transmission of maritime n
4、avigational information, using narrow-band techniques from stations other than radiobeacons. The IT Radiocommunication Assembly, considering Resolution No. 602 (Mob-87) (Data transmissions from maritime radiobeacons for differential radionavigation the technical characteristics set in the Final Acts
5、 of the Regional Administrative Conference for the Planning the studies which were carried out by the ITU-R on the sharing and protection criteria of continuous data the decreasing requirements for maritime radiobeacons and the increasing requirements for differential GNSS, a systems) of the World A
6、dministrative Radio Conference for the Mobile Services (Geneva, 1987); b) of the Maritime Radionavigation Service (radiobeacons) in the European Maritime Area (Geneva, 1985); c) transmissions and hyperbolic radionavigation systems in order to ensure compatibility with radiobeacons; d) recommends tha
7、t the provisions of Recommendation ITU-R M.823, in particular the protection ratios, be applied to that the provisions of Recommendation ITU-R M.631, in particular the protection ratios, be applied to that, to permit more efficient use of the band, regulatory arrangements should be made to allow for
8、 the 1 differential transmissions to facilitate coexistence with radiobeacons; 2 hyperbolic maritime radionavigation systems to facilitate coexistence with radiobeacons; 3 transmission of maritime navigational information using narrow-band techniques from stations other than radiobeacons. * This Rec
9、ommendation should be brought to the attention of the International Maritime Organization (IMO), the International Civil Aviation Organization (ICAO) and the International Association of Lighthouse Authorities (IALA). ITIJ-R RECMN*M. 1178 95 W 4855212 0525988 292 W COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
