1、Op. ITU-R 96 1 OPINION ITU-R 96* FUTURE USE OF THE GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) FOR HIGH-PRECISION TIME TRANSFER (Questions ITU-R 103-1/7 and ITU-R 152-1/7) (1997) The ITU Radiocommunication Assembly, considering that the signals within the navigation allocation bands have also been use
2、d simultaneously for the distribution the decision by the United States of America, Europe and Japan to introduce, as from 1998 to 1999, an 4 of time and frequency; b) operational system known as GNSS using geostationary Satellite Based Augmentation Systems (SBAS): Wide Area Augmentation System (WAA
3、S) in the United States of America, European Global Navigation Overlay Service (EGNOS) in Europe, Multi-Functional Transport Satellite (MTSAT) in Japan; - - - that the navigational payload of these satellites will transmit a signal in conformity with the specifications of that, for the WAAS, EGNOS,
4、and MTSAT systems, the positions of SBAS satellites will be determined to that time-oriented navigation receivers have been used in clock comparisons which showed an uncertainty cl the appropriate satellite navigation systems as referenced in Annex 1; d) within a few metres; e) below 10 ns as refere
5、nced in Annex 1, is of the opinion that the organizations responsible for the realization of this GNSS facilitate the study and development of time- that precise calibration methods should, at the same time, be developed to enable measurement of future GNSS that these receivers be used in experiment
6、s for remote clock comparisons. 1 oriented GNSS receivers; 2 receiver delays and their stability with an uncertainty less than 1 ns; and 3 * This opinion should be brought to the attention of Radiocommunication Study Group 8, and: - FAA (AND-510), Satellite Navigation Program Office, Attn.: J. C. JO
7、HNS 1284 Maryland Ave., SW, Washington, DC 20024 -United States of America. European Space Agency (ESA), Attn.: Mr. Steciw, 8-10, rue Mario Nikis, 75015 Paris -France. Ministry of Transportation, Air Traffic Services Department, Civil Aviation Bureau 1-3 Kasumigaseki 2-chome, Chiyoda-ku, Tokyo - Japan. International Civial Aviation Organization (ICAO) 99 University Street, Montreal, Quebec H3C 5H7 - Canada. - - -
