1、 Recommendation ITU-R SA.1027-5 (07/2017) Sharing criteria for space-to-Earth data transmission systems in the Earth exploration-satellite and meteorological-satellite services using satellites in low-Earth orbit SA Series Space applications and meteorology ii Rec. ITU-R SA.1027-5 Foreword The role
2、of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopt
3、ed. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent P
4、olicy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Polic
5、y for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting
6、 service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coo
7、rdination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R
8、 1. Electronic Publication Geneva, 2017 ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R SA.1027-5 1 RECOMMENDATION ITU-R SA.1027-5 Sharing criteria for space-to-Earth data transmission systems in the
9、Earth exploration-satellite and meteorological-satellite services using satellites in low-Earth orbit (1994-1995-1997-1999-2009-2017) Scope This Recommendation provides sharing criteria for space-to-Earth transmissions from satellites in low-Earth orbit applying to both the Earth exploration-satelli
10、te and meteorological-satellite services. Keywords EESS, METSAT, non-GSO satellites, single entry sharing criteria Related Recommendations and Reports Recommendations ITU-R SA.514, ITU-R SA.1020, ITU-R SA.1021, ITU-R SA.1022, ITU-R SA.1023, ITU-R SA.1026, ITU-R SA.1159. The ITU Radiocommunication As
11、sembly, considering a) that frequency bands allocated to the Earth exploration-satellite and meteorological-satellite services may be shared by several systems, including systems operating in other services; b) that for the Earth exploration-satellite and meteorological-satellite services, Recommend
12、ation ITU-R SA.1026 specifies aggregate interference criteria for some frequency bands in the form of permissible levels of total interference to earth stations operating with satellites in low-Earth orbit; c) that Recommendation ITU-R SA.1023 provides a methodology for deriving sharing criteria bas
13、ed on interference criteria, the anticipated spatial deployment of interfering stations and the associated temporal characteristics of interfering signals; d) that the typical deployment of interfering stations may change over a period of several years as a result of growth in the number of systems
14、and revisions to frequency band allocations that are adopted by world radio conferences; e) that the interference environment encountered by shipborne earth stations in the meteorological-satellite service is unlikely to be worse than that encountered by earth stations operating on land; f) that the
15、 potential interference received by the Earth exploration-satellite service (EESS) and meteorological-satellite earth stations is the aggregate effect of several sources, including systems from other services allocated in these frequency bands, and systems not being allocated within the same band, r
16、ecommends 1 that the single entry interference levels presented in Table 1 should be used as sharing criteria for the protection of earth stations operating in the Earth exploration-satellite and meteorological-satellite services; 2 Rec. ITU-R SA.1027-5 2 that the deployment of interfering stations
17、specified in Annex 1 is the basis for Table 1 should be reviewed periodically in order to determine whether the typical interference environment and consequential sharing criteria should be revised; 3 that system performance degradation due to emissions from stations in services with lower allocatio
18、n status than that of the EESS or the meteorological-satellite service should not exceed 1% of the applicable interference criteria. TABLE 1 Sharing criteria for Earth exploration-satellite and meteorological-satellite earth stations using spacecraft in low-Earth orbit (see Notes 1, 2, 3 and 4) Freq
19、uency band (MHz) Interfering signal power (dBW) in the reference bandwidth to be exceeded no more than 20% of the time Interfering signal power (dBW) in the reference bandwidth to be exceeded no more than p% of the time Interfering signal path Interfering signal path Space-to-Earth Terrestrial Space
20、-to-Earth Terrestrial 137-138 147 dBW per 150 kHz(1) 146 dBW per 150 kHz(1) 136 dBW per 150 kHz(1) p 0.0031 137 dBW per 150 kHz(1) p 0.0063 400.15-401.00 161 dBW per 177.5 kHz 163 dBW per 177.5 kHz 147 dBW per 177.5 kHz p 0.0031 147 dBW per 177.5 kHz p 0.0063 1 698-1 700 149 dBW per 2 668 kHz 149 dB
21、W per 2 668 kHz 138 dBW per 2 668 kHz p 0.0050 138 dBW per 2 668 kHz p 0.0025 1 700-1 710 156 dBW per 2 668 kHz 150 dBW per 2 668 kHz 139 dBW per 2 668 kHz p 0.0016 138 dBW per 2 668 kHz p 0.0094 7 750-7 900 151 dBW per 10 MHz 148 dBW per 10 MHz 127 dBW per 10 MHz p 0.0047 127 dBW per 10 MHz p 0.001
22、6 8 025-8 400 167 dBW per 10 MHz 150 dBW per 10 MHz 133 dBW per 10 MHz p 0.0025 133 dBW per 10 MHz p 0.0050 25.5-27.0 160 dBW per 10 MHz 143 dBW per 10 MHz 116 dBW per 10 MHz p 0.0025 116 dBW per 10 MHz p 0.0050 (1) In this case, the interfering signal powers (dBW) in the reference bandwidths are sp
23、ecified for reception at elevation angles 25; in all other cases the minimum elevation angle is 5 NOTE 1 The single entry interfering signal power thresholds in the above table are the permissible levels of interfering signal power that fall within the specified reference bandwidth. Accordingly, the
24、 total power in interfering signals that are narrower than the reference bandwidth should be considered in frequency sharing analyses. In cases where the interfering signal bandwidth exceeds the reference bandwidth or does not fully overlap the passband of a specific receiver under study, the availa
25、ble frequency dependent rejection should be applied in conjunction with the specified permissible interference levels. NOTE 2 In deriving the above sharing criteria from permissible total levels of interfering signal power, no allowance has been made for interference from spurious emissions. NOTE 3
26、Both the long-term (20% of the time) and short-term ( p% of the time) sharing criteria must be met in order for interference to be at or below permissible levels. NOTE 4 Sharing criteria specified for terrestrial signal paths are applicable to transmitting stations in terrestrial services and transm
27、itting earth stations. Rec. ITU-R SA.1027-5 3 Annex 1 Basis for sharing criteria 1 Introduction The objectives of sharing criteria are, on the one hand, to ensure that interference from all sources will not exceed the applicable interference criteria (i.e. permissible levels of total interference) a
28、nd, on the other hand, to enable efficient sharing by allowing the maximum possible number of systems to share a band in the same area of operation (preferably on a co-channel basis). This Annex presents the basis for subdividing the applicable aggregate interference criteria (as given in Recommenda
29、tion ITU-R SA.1026) among the anticipated interferers. Table 2 presents the factors used in apportioning the total permissible interference for each relevant band between the categories of space-to-Earth and terrestrial interference paths as well as among the anticipated number of interferers in eac
30、h of those categories. The following paragraphs discuss the interference environment in each band. 2 137-138 MHz band The 137-138 MHz band is allocated to the space operation, meteorological-satellite and space research (space-to-Earth) services on a primary basis; the mobile-satellite (space-to-Ear
31、th) on a primary basis in parts of the band and with a secondary basis in other paths of the band; and the fixed and mobile (except aeronautical mobile (R) services on a secondary basis (except in administrations where that allocation is primary). For most of the time at typical meteorological-satel
32、lite earth station sites, space stations such as those in the mobile-satellite service could produce higher levels of interference than terrestrial stations. The meteorological-satellite earth stations using antennas with 10 dBic gain will provide greater discrimination against terrestrial station e
33、missions than will the earth stations using lower antenna gains (2 dBic). In the short-term, propagation enhancements on terrestrial interfering signal paths and the location variability of mobile stations may result in similar interference levels from space-to-Earth and terrestrial stations. 3 400.
34、15-401.00 MHz band The 400.15-401.00 MHz band is allocated on a secondary basis to the space operation (space-to-Earth), but on a primary basis to the meteorological-satellite, space research and mobile-satellite (space-to-Earth) services, the space research (space-to-space) service and the meteorol
35、ogical aids service. In addition, the band is also allocated to the fixed and mobile services in some administrations on a primary basis. For most of the time at typical meteorological-satellite earth station sites, space stations such as those in the mobile-satellite service could produce higher le
36、vels of interference than terrestrial stations. In the short-term, propagation enhancements on terrestrial interfering signal paths and the location variability of mobile and meteorological aids stations may result in similar interference levels from space-to-Earth and terrestrial stations. 4 1 698-
37、1 710 MHz band The 1 690-1 700 MHz band (of which the band 1 698-1 700 MHz is used for the non-geostationary meteorological satellites) is allocated to the meteorological-satellite (space-to-Earth) service on a primary basis and the Earth exploration-satellite (space-to-Earth) service on a secondary
38、 basis; 4 Rec. ITU-R SA.1027-5 the meteorological aids service on a primary basis; and to the fixed and mobile (except aeronautical mobile) services in Region 1 on a secondary basis. In addition, the 1 690-1 700 MHz band is also allocated to the fixed and mobile (except aeronautical mobile) services
39、 in some administrations on a primary basis. The 1 700-1 710 MHz band is allocated to the meteorological-satellite (space-to-Earth) service and the fixed and mobile (except aeronautical mobile) services on a primary basis and the Earth exploration-satellite (space-to-Earth) service on a secondary ba
40、sis. The number of space stations operated in this band is assumed to produce about the same long-term interference levels as terrestrial systems. 5 7 750-7 900 MHz band The 7 750-7 900 MHz band is allocated to the meteorological-satellite (space-to-Earth) service (limited to non-geostationary satel
41、lites) and the fixed and mobile (except aeronautical mobile) services on a primary basis. For long-term interference, it is expected that only a minor contribution will come from space-to-Earth links as the satellite passes rapidly through the antenna main beam. Consequently, a major contribution fo
42、r short-term interference is then expected from space-to-Earth links. Interference on terrestrial signal paths may predominate for direct data readout earth stations which have less antenna discrimination (i.e. which have significantly smaller antennas) towards the horizon than recorded data acquisi
43、tion stations. 6 8 025-8 400 MHz band The 8 025-8 400 MHz band is allocated to the fixed-satellite (Earth-to-space) service, the Earth exploration-satellite (space-to-Earth) service, and the fixed and mobile services on a primary basis. Aircraft stations are not permitted to transmit in the band 8 0
44、25-8 400 MHz. In addition, the 8 175-8 215 MHz segment is allocated to the meteorological-satellite (Earth-to-space) service on a primary basis. Because the only sources of interference on space-to-Earth paths are from Earth exploration-satellite systems, no long-term interference is assumed to occu
45、r on space-to-Earth paths (i.e. for most of the time there is no interferer in view or high levels of earth station antenna discrimination are available). In the short-term, interference may occur among Earth exploration-satellite systems on space-to-Earth paths, although interference on terrestrial
46、 signal paths will predominate (especially for direct data readout earth stations, which have less antenna discrimination towards the horizon than recorded data acquisition stations). Regarding interference from FSS earth stations operating in the Earth-to-space direction, the sharing criteria speci
47、fied for terrestrial signal paths should also be applicable to transmitting stations in terrestrial services and transmitting earth stations. 7 25.5-27.0 GHz band The 25.5-27.0 GHz band is allocated to the Earth exploration-satellite and space research (space-to-Earth), fixed, mobile, and inter-sate
48、llite services on a primary basis. Potential sources of interference on Earth exploration-satellite space-to-Earth paths are other Earth exploration-satellite system satellites, inter-satellite service satellites and terrestrial fixed and mobile systems. No long-term interference is assumed to occur
49、 on the Earth exploration-satellite space-to-Earth path due to Earth exploration-satellite and inter-satellite service satellite emissions because of the constant movement of the satellites (i.e. for most of the time there is no interferer in view or high levels of earth station antenna discrimination are available). Rec. ITU-R SA.1027-5 5 In the short term, interference may occur between Earth exploration-satellite and inter-satellite service satellite systems on space-to-Earth paths, although interference on terrestr
