ITU-R S 1324-1997 Analytical Method for Estimating Interference between Non-Geostationary Mobile-Satellite Feeder Links and Geostationary Fixed-Satellite Networks Operating Co-Freq.pdf
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1、 STD-ITU-R RECMN S-2324-ENGL 1997 9 4855212 05304Lb 733 9 Rec. ITU-R S.1324 1 RECOMMENDATION ITU-R S. 1324 ANALYTICAL METHOD FOR ESTIMATING INTERFERENCE BETWEEN AND GEOSTATIONARY FIXED-SATELLITE NETWORKS NON-GEOSTATIONARY MOBILE-SATELLITE FEEDER LINKS OPERATING CO-FREQUENCY AND CODIRECTIONALLY (Ques
2、tion IT-R 206/4) (1997) The IT Radiocommunication Assembly, considering a) that the World Radiocommunication Conference (Geneva, 1995) (WRC-95) identified the need to develop, as a matter of urgency, criteria for determining the necessity to coordinate and calculation methods for determining levels
3、of interference, as well as the required protection ratios between networks in the mobile-satellite service (MSS); b) that the WRC-95 allocated the frequency bands 19.3-19.6 GHz and 29.1-29.4 GHz for feeder links of non-geostationary-satellite orbit (GSO) networks in MSS in co-direction with GSO fix
4、ed-satellite service (FSS) systems; c that WRC-95 Resolution 12 1 identified the need to undertake, as a matter of urgency, studies to develop coor- dination methodologies for GSO FSS networks and non-GSO MSS feeder links operating in the bands 19.3-19.6 GHz and 29.1-29.4 GHz on an equal basis; 4 be
5、tween satellite networks; e) that the estimation of interference between non-GSO MSS feeder links and GSO FSS systems should be based on the interference power levels not to be exceeded for a specified percentage of time, the frequency of occurrence and the duration of single events, that there may
6、be a need in general to develop a methodology that could be used to estimate interference recognizing a) that estimating interference between non-GSO MSS feeder links and GSO FSS systems based on computer methods of simulation features high accuracy of the obtained results but they may require consi
7、derable runtime and may not be commonly available; b) that interference between non-GSO MSS feeder links and GSO FSS systems may be estimated using time percentage for non-GSO satellites staying within an area into certain discrimination angles from a direction to a GSO satellite in relation to the
8、earth station concerned; c) that the time percentage for a specified value of an angle between a GSO satellite and a non-GSO satellite in relation to the earth station concerned may be defined using either simulations or by the analytical method described in Recommendation 1T-R 5.1257 or by using ot
9、her methods, recommends 1 and GSO FSS systems co-frequency operating in the same direction. that the method given in Annex 1 may be used for estimating interference between non-GSO MSS feeder links 2 1 0.06 No STD-ITU-R RECMN SmL324-ENGL 1997 11855212 0530417 877 D Rec. ITU-R S.1324 0.87 ANNEX 1 Des
10、cription of analytical method for estimating interference between non-GSO MSS feeder links and GSO FSS networks operating co-frequency and codirectionally For estimating interference from non-GSO MSS feeder links and GSO FSS systems a criterion is specified according to which: - interference power s
11、pectral density, Zo, from feeder links of an non-GSO MSS network (in uplink from earth station and in downlink from satellite being a result of feeder link transmissions to and from all the satellites in a constellation) at the input of receiver of a GSO FSS earth station shall not exceed a certain
12、fraction, x, of receiver thermal noise power spectral density, No, within a specified time percentage, % t. An example of criteria for interference from non-GSO MSS feeder links to GSO FSS receivers given in Table 1 are used in the example in Appendix 1. TABLE 1 11-14 GHz The present method provides
13、 an estimation of the time percentage, % t, based on acceptable interference power spectral density, IO, without using simulation methods. For estimating interference between feeder links of non-GSO MSS networks and GSO FSS systems four cases of possible interference effects between earth and space
14、stations of the networks discussed are analysed. They are: Case I: emissions from non-GSO MSS feeder-link earth stations interfering into GSO FSS receiving space stations (see Fig. I). Case2: emissions from non-GSO MSS feeder-link space stations interfering into GSO FSS receiving earth stations (see
15、 Fig. 2). Case 3: emissions from GSO FSS earth stations interfering into non-GSO MSS feeder-link receiving space stations (see Fig. 3). Cuse4: emissions from GSO FSS space stations interfering into non-GSO MSS feeder-link receiving earth stations (see Fig. 4). STD-ITU-R RECMN S-1324-ENGL 1777 485523
16、2 0530438 70b Rec. ITU-R S.1324 3 FIGURE 1 Non-GSO MSS feeder link earth stations interfering into GSO FSS receiving space stations n GSO “ GSOSS I i Non-GSOSS d_ 1 Non-GSO TGSO ES FIGURE 3 GSO FSS earth stations interfering into non-GSO MSS feeder link receiving space stations FIGURE 2 Non-GSO MSS
17、feeder link space stations interfering into GSO FSS receiving earth stations Non-GSO Non-GSO SS -pFZ!? FIGURE 4 GSO FSS space stations interfering into non-GSO MSS feeder link receiving earth stations - Wantedsignal *- Interference SS: space station ES: earth station STD-ITU-R RECMN S.1324-ENGL 1997
18、 m 4855212 0530417 b42 m 4 Rec. ITU-R S.1324 The interference power spectral density at the receiver input can be calculated using the following expressions: for the “uplink”: Io = Pli + Gli(Q) - Lu + G2w(b) dB(W/Hz) for the “downlink“: Io = P3i + G3i(b) - Ld + G4w(Q) dB(W/Hz) where: P 1 i : interfe
19、ring earth stations transmit power spectral density (dB(W/Hz) P3i : interfering space stations transmit power spectral density (dB(W/Hz) Cl) : interfering earth station antenna gain in the direction of the wanted space station (dB) G2w(b) : wanted space station antenna gain in the direction of the i
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