ITU-R S 1068-1994 Fixed-Satellite and Radiolocation Radionavigation Services Sharing in the Band 13 75-14 GHz《频段13 75-14GHz范围内固定卫星和无线定位 无线导航业务的共享》.pdf
《ITU-R S 1068-1994 Fixed-Satellite and Radiolocation Radionavigation Services Sharing in the Band 13 75-14 GHz《频段13 75-14GHz范围内固定卫星和无线定位 无线导航业务的共享》.pdf》由会员分享,可在线阅读,更多相关《ITU-R S 1068-1994 Fixed-Satellite and Radiolocation Radionavigation Services Sharing in the Band 13 75-14 GHz《频段13 75-14GHz范围内固定卫星和无线定位 无线导航业务的共享》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、ITU-R RECMN*S* Lob8 94 m 4855232 0523476 383 I 422 Rec. ITU-R S.1068 RECOMMENDATION ITU-R S. 1068 FIXED-SATELLITE AND RADIOLOCATION/RADIONAVIGATION SERVICES SHARING IN THE BAND 13.75-14 GHz (Question ITU-R 79/4) ( 1994) The ITU Radiocommunication Assembly, considering a) that the World Administrativ
2、e Radio Conference for Dealing with Frequency Allocations in Certain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-92) allocated the frequency band 13.75-14 GHz to the fixed-satellite service (FSS) on a primary basis; b) c) radiolocation and radionavigation services in order to allow these
3、 services to share this band; d) the values given in RR No. 855A and report its outcome; e) f) g) that this band is also allocated to the radiolocation and radionavigation services on a primary basis; that the Footnote No. 855A of the Radio Regulations (RR) restrictions were placed on the FSS and th
4、at the WARC-92 in Resolution No. 112 invited the ex-CCIR to conduct the necessary studies with respect to that digital and analogue TV-FM carriers in the FSS are sensitive to interference from radars; that studies have been performed to ascertain the effects of radar interference to these carrier ty
5、pes; that the highest average e.i.r.ps of known existing radars operating in the band 13.75-14 GHz is 59 dBW, recnmmetis 1. protection of carriers in the FSS fiom existing radars with a maximum average e.i.r.p. of 59 dBW; 2. that the minimum earth station antenna diameter of 4.5 m is consistent with
6、 the minimum e.i.r.p. requirement of 68 dBW for FSS networks and also minimizes the possibilities of unacceptable interference to the radionavigation and radiolocation services; that the minimum value of any emission from an earth station of 68 dBW e.i.r.p. is appropriate for the 3. maximum values e
7、mployed in FSS networks; 4. FSS networks; that the maximum value of any emission from an earth station of 85 dBW e.i.r.p. is consistent with the that the methods and criteria given in Annex 1 be used to compute and assess the interference from radars to 5. sharing criteria in Annex 1. that the desig
8、n of new transmitters in the radiolocation/radionavigation services should be consistent with the ANNEX 1 Sharing criteria between radiolocationiradionavigation services and the fixed-satellite service 1. interference from radar into FSS Measurements reflecting very severe interference from radars i
9、n the band were conducted in order to assess its impact on some FSS digital carriers as well as to analogue TV carriers. IT-R RECMN*S= Lb 94 I 4855212 0523477 018 I Rec. ITU-R S.1068 423 1.1 Measurements of interference into digital FSS camers The interference was measured into Intelsat intermediate
10、 data rate (IDR) digital carriers operating at 2 Mbits, 8 MbWs and 45 Mbii/s and using FEC rate 3/4. The interfering radars were assumed to operate in a range of the pulse repetition frequencies (PRF) of 1 kHz to 100 kHz. It was also assumed that the interference occurs during the “clear sky” condit
11、ions, i.e. that the noise level on the link is very low compared to the interference, and consequently, its impact is insignificant. The results of the measurements of the BER versus the duty cycle 6 are shown in Fig. 1 for all the three digital carriers measured and for PRF = 1 kHz. The results for
12、 other PRFs show similar behaviour. Having in mind that radar interference is a short time event, a degradation up to BER = lo4 is acceptable. Using the results of the measurements, the C/Z values corresponding to BER = lo4 were determined and converted into the permissible peak radar e.i.r.ps. (e.i
13、.r.ps of the FSS carrier of 68 dBW, 74 dBW and 81.5 dBW for 2 Mbii/s, 8 Mbits and 45 Mbit/s carriers, respectively). A composite envelope of the results is shown in Fig. 2 together with the (59 -log 6) (dBW) limit imposed by the RR. 1.2 Measurements of interference into analogue TV carriers The C/Z
14、ratios for “just perceptible interference” into a NTSC, 20 MHz TV carrier were recorded for PRFs of 1 kHz, 10 kHz and 100 kHz, and for duty cycles up to about 3%. The carrier-to-noise ratio of the TV carrier was set at 18 dB. The results are presented in Fig. 3. Following the same procedure as above
15、 for IDR carriers, a composite envelope of the maximum permissible peak radar e.i.r.ps was then derived for a TV carrier e.i.r.p. of 77 dBW and presented in Fig. 4. 2. Sharing criteria The following criteria are based on the analysis in 5 3 and 4 and are consistent with the expected radar emissions
16、from the radars described in 5 3. 2.1 Short-term criterion for FSS digital IDR carriers The necessary short-term criterion for sharing between the FSS digital carriers and radars was obtained as an envelope of the maximum permissible peak radar e.i.r.ps towards FSS geostationary satellites determine
17、d for various FSS carriers as indicated in 5 1. The following expression provides a good approximation of the envelope: e.i.r.pp (dBW) = 59 + 15 log i + 0.5 PRF (kHz) / 6 (%)I (1) Taking into account the peak radar e.i.r.p. limit defined by the FR and the above developed criterion, the short-term sh
18、aring criteria can be defined as: c 59 - 10 log 6 (%)/ loo or I 59 + 15 log i + 0.5 PRF (kHz) / 6 (%)I for more than 99.98% of any month and 99.996% of any year li e.i.r.p.p (dBW) I whichever is less. The criteria are shown in Fig. 2. 424 ITU-R RECMN*S* 1068 74 m 4855232 0523478 T54 m Rec. ITU-R S.1
19、068 FIGURE 1 BER versus duty cycle for PRF of 1 kHz a) 2 Mbit/s IDR carrier Duty cycle, 6 (%) b) 8 Mbit/s IDR carrier ,n-2 lu t 10- AL I I 5 2 5 2 5 2 5 2 10- 1 10 Duty cycle, 6 (%) c) 45 Mbit/s IDR carrier Duty cycle, 6 (%) A E: CII=4dB A F CII=SdB 0 G: CI1 = 6 dB ITU-R RECMNaS. LObB 94 = 48552L2 O
20、523479 990 W 425 Rec. ITU-R S.1068 FIGURE 2 Interference criteria for IDR carriers 10- -2 5 lo-2 10- 1 Duty cycle, 6 (%) A: PRF= 1 K F PRF=115K B: PRF= 1.5K G PRF=130K C: PRF= 3 K H: PRF = 160 K D: PRF= 6K I: PRF= 100 K E: PRF= 10 K e.i.r.p. I59 + 15 log I + 0.5 PRF (kHz)/G (%)I dBW For iDR carriers
21、, 2 Mbit/s to 45 Mbit/s, QPSK, rate 314 FEC, BER = i x io6 e.i.r.p. I 59 - 10 log 6 (%)/100 dBW (RR No. 855A) 10 lo2 2.2 Long-term criterion for FSS digital ZDR carriers The mask in Fig. 5 provides the long-term criterion for FSS digital IDR carriers for radar duty cycles up to about 10%. The peak r
22、adar e.i.r.p. at point A should be computed using equation (2). The percentage of time at point A is: (For BW = 36 MHz, t% = T%) 36 T(%) BW(MHz) t(%) = T = 0.004% is emissions over the year, allowance is maintained. the overall annual allowance. However, in the case of non-uniform distribution of ra
23、dar the worst month percentage should not exceed 0.02% provided that the overall annual ITU-R RECMN*S. Lab8 94 M 4855232 0523480 602 = 426 2 5 Rec. ITU-R S.1068 FIGURE 3 Radar interference into anabgue TV (C/I for ?just perceptible interfrence? into NTSC, 20 MHz TV) L 10- io- Duty cycle, (%) 2 1 FIG
24、URE 4 interference criteria for analogue FM-TV carriers 5 2 5 I o A: PRF= 1 kHz A B: PRF= 10kHz o C: PRF= 100 kHz 10 A: PRF= B: PRF= 1K 3K C: PRF= 10 K D: PRF= 15 K G: PRF= 100 K e.i.r.p. I52 - (1.25)?0gPRF(kHz) (5 log (%)/1001) + 30 log l + 0.001 PRF (kHz)/G (%)I For just perceptible interference t
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