1、1997 m 4855212 0533497 Rec. ITU-R SA.1277 211 RECOMMENDATION ITU-R SA.1277“ SHARING IN THE 8025-8400 MHz FREQUENCY BAND BETWEEN THE EARTH EXPLORATION-SATELLITE SERVICE AND THE FIXED, FImD-SATELLITE, METEOROLOGICAL-SATELLITE AND MOBILE SERVICES IN REGIONS 1, 2 AND 3 (Question ITU-R 214/7) (1997) The
2、IT Radiocommunication Assembly, considering that fixed services (FS), fixed-satellite services (FSS) and mobile services are allocated on a primary that the meteorological-satellite (METSAT) service is allocated on a primary basis in the 8 175-82 a) the 8 025-8 400 MHz frequency band in the three Re
3、gions; b) frequency band in the three Regions; kasis in 5 MHz c) secondary basis in Regions 1 and 3 in the 8 025-8 400 MHz frequency band; that the Earth exploration-satellite service (EESS) is allocated on a primary basis in Region 2, ad on a d) (pfd) limits imposed by the Radio Regulations (RR) No
4、. S21.16 are respected (see Q 1 of Annex 1); that no interference can be caused by the EESS to the FS and the mobile service when the power flux-density e) geostationary orbit, imposed by the RR No. S22.5, are respected (see 0 2 of Annex 1); that no interference can be caused by the EESS to the FSS
5、and the METSAT when the pfd limits at the 0 among a network of fixed stations; that the study in 2 of Annex 2 shows that there exists extensive possibilities for siting of EESS earth stations g) meteorological earth stations (see 0 3 of Annex 2); that considering f) may be extended also for siting E
6、ESS earth stations with respect to fixed-satellite and h) EESS earth stations among mobile stations; that the study in Q 4 of Annex 2 shows that, as in considering f), there exists extensive possibilities for siting of j can be encountered between the EESS and the FS, the FSS, the METSAT and mobile
7、services in the three Regions; that from the experience gained over the last 20 years, it is demonstrated that no frequency sharing problems k) allocation status in the three Regions, that the effective planning and development of future EESS networks with global coverage require a primary recommend
8、s 1 8 025-8 400 MHz band is feasible subject to the following conditions: - that sharing between the EESS and the FS, the FSS, the METSAT and the mobile services in the RR No. S22.5 and RR No. S2 1.16 provisions apply; - the method described in Annex 2 be used to calculate separation distances betwe
9、en earth stations of the EESS and terrestrial stations or earth stations of the other services. (Separation distance refers to the distance that could be achieved in coordination). * This Recommendation should be brought to the attention of Radiocommunication Study Groups 4, 8 and 9. STD-ITU-R RECMN
10、 SA.1277-ENGL 1997 D 4855212 0533498 9bb = 212 Rec. ITU-R SA.1277 Arrival angle, 9 ANNEX 1 pfd limit (dB(W/(m2.4 kHz) Analysis of interference from the EESS to other services in the frequency band 8 025-8400 MHz 25“ - 6 37g2 + d(6 378 + 600)2 - 6 37g2 35 786 ALp = 20log namely: Up= 1.9dB STD-ITU-R R
11、ECMN SA-1277-ENGL 1993 = Y855212 0531500 344 QPSK 214 Rec. ITU-R SA.1277 50 12.5 -61.5 6.2 Table 2 gives the technical characteristics of the EESS satellites SPOT 1/2/3/4. The spectral power density is the maximal density (Le. at the centre of the QPSK signal) that represents the worst case of the i
12、nterference. Earth station Antenna category diameter (m) TABLE 2 Main characteristics of the EESS satellites SPOT 1/2/3/4 Maximum Maximum power density Bandwidth CII antenna gain (dB(W/Hz)() (MHz) (dB) (dBi) Maximal spectral power density Maximal gain (dB (WIHz) 1 (dB) Bit rate Power I (dBW G H 18 6
13、1 -43.5 60 74.7 8 54 -34 60 77.2 Table 3 gives the technical Characteristics of the earth stations transmitting to a governmental telecommunication satellite in the 8 025-8 400 MHz frequency band, as well the CII ratios obtained for the telecommunication satellite with the characteristics of the EES
14、S satellite given in Table 2. I J K L L TABLE 3 3 44.5 -44 40 51.7 1.5 39.5 -44 40 52.7 1.3 38.5 -38 40 57.7 o. 9 35 -38.8 80 53.2 0.9 34.5 -38.8 80 52.9 Main technical characteristics of earth stations transmitting to a governmental telecommunication satellite in the 8 025-8400 MHz frequency band a
15、nd CII ratios obtained for thetelecom munication satellite with the characteristics of the EESS satellite given in Table 2 Antenna gain (dB i) 44 44 44 44 Maximum transmitter e.i.r.p. Bandwidth power density CII power (dBW (MW (dB(W/Hz) (dB1 (dB) 30 74 0.960 -29.6 71.6 20 64 0.0 18 -22.6 78.6 13 57
16、0.0024 -20.8 80.4 17 61 0.0004 -9.0 92.2 Table 4 gives the main technical characteristics of the METSAT earth stations and the CII ratios obtained for the meteorological satellite with the characteristics of the EESS satellite given in Table 2. TABLE 4 Characteristics of a METSAT earth station and C
17、1I ratios obtained for the meteorological satellite with the characteristics of the EESS satellite given in Table 2 STD-ITU-R RECMN SA.bZ?-ENGL 1997 = 4855212 0531501 280 Rec. ITU-R 1277 215 We conclude that there would not be interference from the EESS space stations with characteristics similar to
18、 those ones given in Table 2 to the fixed-satellite or METSAT receivers. ANNEX 2 Analysis of interference to the EESS from other services in the frequency band 8025-8400 MHz Method for calculating separation distances between earth stations of the EESS and terrestrial stations or earth stations of t
19、he other services 1 Introduction This Annex concerns the a priori evaluation of the order of magnitude for acceptable separation distances between an EESS earth station on one hand and a fixed, fixed-satellite, METSAT or mobile station on the other hand, as a function of given parameters. It is prec
20、ised that the following calculation does not replace the method given in Appendix S7 of the RR and it is not intended to use it for evaluation of coordination distances. The calculation of the attenuation over the interference path is not based on the worst case but on an average case, which only re
21、fers to diffraction caused by an obstacle located between the two stations. The separation distances calculated here gives a realistic idea of practical sharing possibilities between EESS and FS, FSS, METSAT or mobile services. 2 Interference from terrestrial fixed service transmitters to EESS earth
22、 station receivers The sharing criterion for this interference path is a coordination distance required to ensure adequate separation between the terrestrial service transmitters and the EESS earth station receivers. The minimum permissible basic transmission loss to protect the earth station can be
23、 stated as: where: P, : terrestrial service transmitter power (dBW) G,(,) : terrestrial service antenna gain in the direction of the earth station (dBi) G,(,): gain of the earth station antenna in the direction of the terrestrial station (dBi) Pi : maximum permissible interference at the earth stati
24、on receiver input (dBW) 8,: angle between the terrestrial service antenna axis and the interference path (degrees) 8,: Lb(p%): the value of minimum acceptable basic transmission loss to be exceeded for all but p% of the time along angle between the EESS antenna axis and the interference path (degree
25、s) the interference path between the terrestrial transmitter and the earth station receiver (dB). The values of Pi and p are defined by Recommendation ITU-R SA.1027 and given in Table 5 for the 8 025-8400 MHz frequency band. STDmITU-R RECMN SA-1277-ENGL 1997 W 4855232 0533502 I117 W EESS earth stati
26、on category 55.2 dBic antenna, for recorded data acquisition 36.4 dI3ic antenna, for direct data readout 216 Rec. ITU-R SA.1277 Reference bandwidth Interfering signai power to be exceeded for no more than 20% of angles 2 5“ Interfering signai power to be exceeded for no more than p% angles 2 5“ (MHz
27、) the time at elevation of the time at elevation (dBW (dBW 100 -130 -117 p = 0.010 p = 0.01 1 40 -134 -126 TABLE 5 Sharing criteria for space-to-Earth data transmission systems operating in the EESS using satellites in low-Earth orbit, according to Recommendation ITU-R SA.1027 The values of gain Gr
28、(9,) for the worst case, i.e. when the earth station antenna is plotted in azimuth to the undesired signal and at 5“ of elevation can be obtained from the formulas below given in the Appendix S7 of the RR: - for D/h 2 100: Gr(9r) = 32 - 25 log 9r G,(9,) = -1OdBi - for D/h c 100: G,) = G, - 2.5 x (fe
29、y where: for en 2.4 0.5 1.6 TABLE 15 Minimum permissible basic transmission losses (dB) along the interference path to protect the EESS earth station from the emissions of the METSAT service stations given in Table 4 with a geostationary-satellite elevation angle of 20“ EESS 55 dBic antenna, for recorded data acquisition the horizon the horizon E, = A20)
