1、4855212 053bb14 37b m Rec. ITU-R SA.1164-I 85 RECOMMENDATION ITU-R SA. 1 164-2 SHARING AND COORDINATION CRITERIA FOR SERVICE LINKS IN DATA COLLECTION SYSTEMS IN THE EARTH EXPLORATION-SATELLITE AND METEOROLOGICAL-SATELLITE SERVICES (Question ITU-R 142/7) (1 995-1 997- 1999) The ITU Radiocommunication
2、 Assembly, considering 4 that the fiequency bands allocated to the Earth exploration-satellite service (EESS) (including the meteorological-satellite (MetSat) service) may be shared by several systems, including those operating in other services; b) criteria: that Recommendation ITU-R SA.1163 specif
3、ies the interference criteria needed to determine the sharing c) that sharing criteria may be determined using the methodology described in Recommendation ITU-R SA. 1023; d) that the typical deployment of interfering stations may change over a period of years as a result of growth in the number of s
4、ystems and revisions to fiequency band allocations that are adopted by world radiocommunication conferences; e) that by governing the use of the radio-frequency spectrum in their territory and through international coordination of fiequency assignments, administrations may exercise a degree of contr
5、ol over the number of systems that may generate interference at significant levels; fl worse than those encountered by earth stations operating on land; that the interference levels encountered by shipborne earth stations in the MetSat service are unlikely to be g) warranted between earth stations a
6、nd radiosondes that operate in the same fiequency band; Recommendation ITU-R IS.850, which provides the methodologies for determining when coordination is h) warranted between transmitting terrestrial stations and earth stations, Recommendation ITU-R IS.849, which provides the methodologies for dete
7、rmining when coordination is recommends 1 that the single entry interference levels presented in Table 1 be used as sharing criteria, or as the basis for alternative forms of sharing criteria (e.g. power flux-density limits), for the protection of stations operating in the EESS and MetSat service; 2
8、 transmitting space stations and receiving earth stations operating in the MetSat service; that a 6% peak increase in equivalent link noise temperature be used as the threshold for coordination between 3 that the deployment of interferers specified in Annex 1 be reviewed periodically in order to det
9、ermine whether the typical interference environment and consequential sharing criteria should be revised. NOTE 1 - The coordination provisions of Radio Regulations (RR) No. S9.11NResolution 46 (Rev.WRC-97) are applied in the 400.15-401.00 MHz band. The sharing criteria specified in this Recommendati
10、on should be used to determine whether these consultations or coordinations may be warranted in the absence of other established criteria. NOTE 2 - The sharing criteria of Table 1 (including the Notes thereto) are intended to be applied in frequency sharing analyses and the coordination of fiequency
11、 assignments (i.e., as the minimum levels of accepted interference for applicable stations). In coordination applications, the actual interference seen by the receiving station should be compared with that assumed in Annex 1 in order to help determine whether an interfering signal power greater than
12、 the permissible single entry level can be accepted. Generally, this consideration may enable acceptance of interference levels that may be as high as those specified in the applicable interference criteria (Recommendation ITU-R SA. 1 163). Interfering signal power (dBW) in the reference bandwidth t
13、o be exceeded no more than p% of the time 1 Space-to-Earth I Terrestrial Station subject to interference Interfering signal power (dBW) in the reference bandwidth to be exceeded no more than 20% of the time GSO data collection platform interrogation Earth -207.3 dBW per station 100 HA) -183.9dBWper
14、1 O0 Hz() p = 0.01 -183.1 dBWper 100 HZ() p = 0.09 86 Rec. ITU-R SA.1164-2 NOTE 3 - The coordination threshold specified in Q 2 is sufficiently conservative to assure that interference will be below permissible levels in cases where coordination is not triggered. In order to apply that criterion whe
15、n determining whether interference might be unacceptable, the methodology of RR Appendix S8 may be adapted and applied to the stations concerned. In order to avoid unnecessary coordination with respect to systems using non-geostationary (non-GSO) satellites, administrations may wish to assume that a
16、 certain amount of antenna discrimination is available from the receiving station (e.g. a level of discrimination that is available for 99.9% of the time). NOTE 4 - Data collection platform interrogation from non-GSO satellites will be available in the near future. NOTE 5 - The criteria in Table 1 a
17、re based on the interference environment given in Annex 1 (see also Q 3). TABLE 1 Sharing criteria for stations in the EESS and MetSat service Frequency band (MHz) Function and type of earth station I Space-to-Earth I Terrestrial Non-GSO data coi lection, low-zain antenna Space station -183.1 dBW er
18、 1600 Hz( P -184.8 dBW er 1600 Hz( P -175.9 dBW er- 1600 Hz(P p = 0.05 -176.2 dBW er p = 0.05 1600 Hz( P 40 1-403 Earth-to-space 137-138 space-to-Earth Non-GSO data collection, command data acquisition (CDA) station Earth station -159.5 dBW er 8 320 Hz( IP -164.3 dBW er 8 320 HA1? -151.3 dBW per 8 3
19、20 Hz p = 0.05 -151.7 dBW er 8 320 HdlP p = 0.05 -197.4 dBW per 100 Hz() 401-403 Earth-to-space 1670-1 690 space-to-Earth GSO data col i ecti on, station low-gain antenna GSO data D = 0.075 D = 0.025 -194.0 dBW per 1 O0 Hz() -181.7 dBW per 100 HZ() p = 0.0025 -185.0 dBW per 100 Hid2) D = 0.0025 -181
20、.6 dBW per 100 Hd2) -184.2 dBW per 1 O0 Hz() p = 0.01 1 D = 0.01 1 GSO data per -192.0 dBW per I 100HdY 2 025-2 110 Earth-to-space 460-470 space-to-EartF -187.3 dBW per 100 Hz() () (2) NOTE 1 - The single-entry interfering signal power thresholds in Table 1 are the permissible levels of interfering
21、signal power that fall within the specified reference bandwidth. Accordingly, the total power in interfering signals that are narrower than the reference bandwidth should be considered in frequency sharing analyses. in cases where the interfering bandwidth exceeds the reference bandwidth or does not
22、 fully overlap the passband of a specific receiver under study, the available frequency dependent rejection should be applied in conjunction with the specified permissible interference levels. The pertinent ITU-R SM Recommendations should be consulted for guidance on this matter. NOTE 2 - The sharin
23、g criteria can be expressed as permissible power flux-density into the main beam of the receive antenna by subtracting 10 log (G h2/4n) from the values given in Table 1, where G is the antenna gain and h is the wavelength. NOTE 3 - in deriving the above sharing criteria from permissible total levels
24、 of interfering signal power, no allowance has been made for interference from spurious emissions. NOTE 4 - The specified level of single-entry interfering signal power may be directly converted to, and applied as, equivalent values of power flux-density only for earth stations that use low-gain, no
25、n-tracking antennas. NOTE 5 -Both the long-term (20% of the time) and short-term (c 1% of the time) sharing criteria must be met in order for interference to be at or below permissible levels. NOTE 6 - Sharing criteria specified for terrestrial interfering signal paths are applicable to ground-based
26、 stations. The criteria for space-to-Earth interfering signal paths also pertain to air-to-ground paths. The interfering signal powers (dBW) in the reference bandwidths are specified for reception at elevation angles 5. The interfering signal powers (dBW) in the reference bandwidths are specified fo
27、r reception at elevation angles 3. M 4855232 053bbLb 349 W Rec. ITU-R SA.1164-2 ANNEX 1 Basis of sharing criteria 1 Introduction This Annex presents the implementation of Recommendation ITU-R SA. 1023 using the interference criteria arrived at in Recommendation ITU-R SA. 1 163. The permissible inter
28、ference levels are subdivided according to Recommenda- tion ITU-R SA.1023 into space and terrestrial categories and then into the number of anticipated interferers in each category. The basis for these allotments is shown in Table 2 and a discussion of the interference environment in each band is pr
29、esented below. 2 401-403 MHz band The 401-402 MHz band is allocated on a primary basis to the meteorological-aids and space operation (space-to-Earth secondary basis. I direction) services. The EESS (Earth-to-space), MetSat (Earth-to-space), fixed, and mobile services are allocated on a The 402-403
30、MHz band is allocated on a primary basis to the meteorological-aids service. The EESS (Earth-to-space), MetSat (Earth-to-space), fixed, and mobile services are allocated on a secondary basis. For most of the time, stations in the EESS and MetSat service are expected to produce higher interference le
31、vels than the terrestrial services. In the short-term, propagation enhancements on terrestrial interference paths and the location variability of mobile stations may result in similar interference levels from space-to-Earth and terrestrial stations. 3 460-470 MHz band The 460-470 MHz band is allocat
32、ed to the fixed-satellite and mobile-satellite services on a primary basis with the MetSat service (space-to-Earth) as a secondary allocation. For most of the time interference will occur from terrestrial stations. For brief periods additional interference sources fiom space systems can be expected.
33、 4 1670-1 690 MHz band The 1 670-1 690 MHz band is allocated on a primary basis to the meteorological aids, MetSat (space-to-Earth), fixed and mobile services and, in Region 2, to the mobile-satellite service (Earth-to-space) in the band 1675-1 690 MHz. 5 2 025-2 110 MHz band The 2 025-2 1 1 O MHZ b
34、and is allocated on a primary basis to the fixed and mobile services, to the space research service (Earth-to-space and space-to-space), to the space operation service (Earth-to-space and space-to-space), and to the EESS (Earth-to-space and space-to-space). 6 137-138 MHz band The 137-138 MHz band is
35、 allocated on a primary basis to the space operation, MetSat, and space research services. The band is allocated on a secondary basis to the fixed and mobile (excluding aeronautical mobile) services, except in 35 administrations where the allocation is on a primary basis. Parts of the band are allocated on a primary basis to the mobile-satellite (space-Earth) service, and other parts of the band are allocated on a secondary basis to this service. 88 4855212 053bb37 085 Rec. ITU-R SA.1164-2 s vi CI - s vi F m s 3 O v
