1、STD-CEPT ERC REPORT 37-ENGL 3992 .I 2326434 0035124 933 ERC REPORT 17 European Radiocommunications Committee CERC) within the European Ciderence of Postal Telecommunications Adknistrations (CEPT) ANALYSIS OF SHARING BETWEEN EARTH EXPLORATION SATELLITE SERVICES (PASSIVE) AND TERRESTRIAL FIXED LINKS A
2、T AROUND 58 GHz Madrid, October 1992 STD-CEPT ERC REPORT L7-ENGL 3992 I 232bll34 0035325 87T sl Copyright 1992 the European Conference of Postai and Telecommunications Administrations (CEFI) STD*CEPT ERC REPORT 17-ENGL 1792 I 232b414 001512b 706 II Frequency (GHz) Near 55 1. 4.1. 2. 3. 3.1. 3.1.2. 3
3、.1.3. Interference threshold (dBW) Bandwith (MHz) -157 250 ERC REPORT 17 Page 1 ETSI/ETS DEfM4007 (57.2-58.2 GHz) ANALYSIS OF SHARING BETWEEN EARTH EXPLORATION SATELLITE SERVICES (PASSIVE) AND TERRESTRIAL FIXED LINKS AT AROUND 58 GHz Max EIRP 15 dBW INTRODUCTION At the CEW-SE Working Group meting in
4、 September 1991, members were requested to examine the feasibility of service sharing between the Earth Exploration Satellite Services (EESS) and the terrestrial Fixed Service (PS) in the band 54.25-58.2 GHz. In addition, CEPT Recommendation T/R 22-03 recommended that CEPT should develop necessary s
5、haring cntena between the services authorised by the Radio Regulations. The object of this report is to provide an analysis of sharing between passive sensors and the FS in the band 57.2-58.2 GHz. The Annex to CCIR Report 984 mentions and discusses propagation factors which affect the transmission o
6、f a radio wave and considers other technical aspects relating specifically to the space research service. Preferred frequency bands for passive near-Earth space research arc discussed in CCIR Report 693. CHARACTERISTICS OF EESS The EESS sensor interference threshold is contained in CCIR Report 694-3
7、 and extracted as follows: Table 1. Sensor interference thresholds CHARACTERISTICS OF FS SYSTEMS The FS parameters are contained in the ETSI ETS uropean Technical Standard) and are extracted as follows: Table 2. Max EIRP for the 58 GHz band 58 GHz band Frequency planning is not required in this band
8、. There are ten channels and ali systems will use a channel spacing of 100 MHz. Applications for Digital Systems Typicai applications would be 2 up to 34 Mbiils for point-to-point local networks, mobile and transportable applications. Applications for Wideband Analogue Systems Point-to-point TV Poin
9、t-to-point Wideband Video (e.g. Radar Remoting). STDOCEPT ERC REPORT 17-ENGL 1772 W 2326414 0015127 bY2 II ERC REPORT 17 Page 2 4. 4.1 4.2. 4.3 4.4 ANALYSIS From a preliminary examination of the problem, it is concluded that the zenithal attenuation would give the worst-case scenario, bearing in min
10、d that the atmospheric absorption at 58 GHz in the horizontal direction is about 15 dBlkm Attenuation The zenithal attenuation, extracted from CCLR Report 719 is attached. It will be seen that the fme structure indicates two absorption minima within the frequency range of interest. One gives a zenit
11、hal attenuation of 95 dB at 57.2 GHz and the other gives a zenithal attenuation of 120 dB at 57.9 GHz. Since both of these are for zero kminitial height it would be prudent to assume an initial height of, say, 250 m to be more representative of Europe. Thus, taking only the worst-case this reduces t
12、he zenithal attenuation to about 92 dB. EESS The following parameters are extracted from CCIR Reports 693 and 694: Satellite orbit 500 km altitude Interference threshold Sensor antenna effective areas Spreading loss (-10 log 4 lld) -157 dBW in 250 MHZ 8.7 dBm2 -125 dB/m Coverage width 10 km FS The f
13、ollowing parameters are used in this analysis: Max EIRP 15 dBW Max overhead antenna gain EIRP in the overhead direction (the antenna radiation pattern used here gives the worst-case) 3 dBi -17 dBW Max output power -20 dBw Calculations The maximum allowable interference power (M.A.I.P.) into one spot
14、 beam of the EESS is equal to: Interference threshold - Spreading losses - Zenithal atmospheric loss - Effective area + Bandwidth factor The maximum number of fixed links is found from 10 log (NO. of Links) = I” - EJRF Assuming that: - all the terrestrial fixed links operate over 100 MHz bandwidth,
15、- the maximum EIRP in the overhead direction for the fixed links is -17 dB W, - interference may occur from anyhere in the 10 km coverage width, then some 34 thousand fxed links per square km could be implemented in any one channel without causing undue interference to the EESS (passive). 5. CONCLUS
16、IONS The analysis, tahg worst-case parameters, shows that the EESS (passive) could Co-exist with terrestrial FS in the 57.2-58.2 GHzband. The same conclusion will apply to sharing between space research and fixed services. Although Report 694-2 gives examples of parameters leadmg to various effective areas, the figure here represents the worst-case &est gain). STD-CEPT ERC REPORT 17-ENGL 1992 M 232b4L4 0015128 589 I ERC REPORT 17 Page 3
