1、m 4855212 053b54b TT5 Rec. ITU-R SA.1025-3 17 RECOMMENDATION ITU-R SA. 1025-3* PERFORMANCE CRITERIA FOR SPACE-TO-EARTH DATA TRANSMISSION SYSTEMS OPERATING IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES USING SATELLITES IN LOW-EARTH ORBIT (Questions ITU-R 139/7 and ITU-R 141
2、/7) (1994-1995-1997-1999) The ITU Radiocommunication Assembly, considering a) that the hypothetical reference system specified in Recommendation ITU-R SA. 1020 defines space-to-Earth links for direct readout of data and acquisition of recorded data; b) that the performance objectives for these trans
3、missions must be consistent with the attendant functional requirements and with the performance limitations associated with the systems and Cequency bands in which the requirements will be fulfilled; meteorological-satellite services are intended to provide guidelines for the development of actual s
4、ystems; d) e) prerequisite for the establishment of the associated interference criteria, I that performance objectives for representative systems operating in the Earth exploration-satellite and I 4 that performance objectives may be determined using the methodology of Recommendation ITU-R SA. 102
5、1 ; that performance objectives for Earth exploration-satellite and meteorological-satellite services are a recommends that space-to-Earth data transmissions in the Earth exploration-satellite and meteorological-satellite services 1 using satellites in low-Earth orbit have the performance objectives
6、 specified for the frequency bands in Table 1. * This Recommendation should be brought to the attention of the World Meteorological Organization (WO). COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Servicesr m E Y 8 - z m % e .3 Y 3 O m c -8
7、c i5 m - Y u - 2 m 3 * .- ;B r, m ro m U i m E 3 2 .- ti 3 g G W W E * $ 8 5 .- Y al .- s u .- .- u 3 m m m U V al o .-a 2 8 2 B z cg 22 dm 24 rB CI Y a O C en CIE e O m * z o cci O .- - Y m Y R o e m .- Oe a 2 CI m E s m u 2 E- 2 2 - .- c Y r: 3 m m 0 B E 8 2 d 3 al + I 2 COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
