COORDINATION OF EARTH STATIONS WITH RESPECT TO TERRESTRIAL STATIONS / OTHER EARTH STATIONS
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1 COORDINATION OF EARTH STATIONS WITH RESPECT TO TERRESTRIAL STATIONS / OTHER EARTH STATIONS
2 Coordination requirements GSO Satellites Non-GSO Satellites Interference Transmitting Earth Station Terrestrial Receiving Earth Station
3 Why?
4 COORDINATION OF EARTH STATIONS Volume No.1 Article 5 Region MHz FIXED FIXED-SATELLITE (Earth-to-space) MOBILE All Regions MHz FIXED FIXED-SATELLITE (Earth-to-space) (space-to-earth) MOBILE Article 9 Provisions : 9.6, 9.15, 9.17, 9.17A, 9.21 Volume No.2 Appendix 5 Coordination area : Appendix 7 Appendix 4 Coordination data to neighboring countries (Vol. 1) Article 11 Notification in Master Register
5 When? Volumn No.1 Article 5 Region MHz FIXED FIXED-SATELLITE (Earth-to-space) equal rights Space = Terrestrial All Regions MHz FIXED-SATELLITE (Earth-to-space) (space-to-earth) opposite direction Uplink = Downlink If coordination area includes the territory of another country
6 PROVISIONS for effecting COORDINATION Article A/ 9.15 Administrations shall effect coordination notifying to the BR or brings into use any frequency assignment. before Coordination of a Specific or Typical Earth Station of non-gso in respect of Terrestrial Stations (associated with Footnote A) Coordination of any Specific Earth Station or Typical Mobile Earth Station in frequency bands 9.17 above 100 MHz, in under respect of Terrestrial No Stations, Footnote 9.11A with the exception of the coordination under 9.15 agreement Coordination of any Specific Earth Station in respect of other Earth (ex: Stations footnote operating in MSS) the 9.17A opposite direction of transmission (ODT), or any Typical Mobile Earth Station in respect of Specific Earth Station (ODT) *Rx E/S No methodology in AP Space Service Specific Earth Station of a service required to seek agreement of other administrations (under Footnotes)
7 Why AP7? AP7 Anomalous (short-term) Interference Propagation mechanisms Elevated layer reflection/refraction (h < x 100m) Common Volume at the intersection of the antenna main beams Hydrometeor scatter Tropospheric scatter (>100km) Ducting (>500km) Diffraction (local) Great-circle propagation (Mode 1) 4 Radio-Clim. zone + Hydrometeor scatter (Mode 2) 15 Rain zone A-Q
8 Simple button? Computer Program for Determination of Coordination Area AP7 embedded in GIBC C:\BR_SOFT\BATCH Create your Input File
9 Report (p1) of AP7 (GIBC) program Rcv GSO ES (FSS) w.r.t. Terrestrial St (TS, FS, MS) Freq: GHz Sat longitude : 18 W Horizon Ele. Anagle : 0 Affected countries: Countries included in Coordination Distance/Area Automatic indication in AP7 report
10 Report (p2) of AP7 (GIBC) program Tech. parameters of the E/S Calculated parameters by 5 Azimuth Coordination distance by 5 Azimuth ( 0-355º ) Probably Affected ADM in AP7 report
11 How (Tx E/S)? Azimuth x o Max ( Great-circle propagation (Mode 1), Hydrometeor scatter (Mode 2) ) L(%)=P t +G e +G x -P r (%) ex: Gx = 52 dbi, Pr(0.0025%) = -98 dbw/hz for 12-14GHz AP7 Table 7 (Mode1) L(%)=P t +G x -P r (%) Great-circle propagation (Mode2) Hydrometeor scatter G x Pr(p) G x P t * G e (10 to 123 Km/f) Minimum Coordination Distance Maximum Calculation Distance (369/ Mode2 up to 1200 Km/ Mode1*Zone C)
12 Coordination area of Tx GSO E/S (FSS) with respect to Rcv Terrestrial stations (FS) 10E 15E 20E ALB MLT Freq: GHz Sat longitude : 1 W Horizon Ele. Anagle : 0 Affected countries: 20E I LBY TUN
13 How (Rcv E/S)? Azimuth x o Max ( Great-circle propagation (Mode 1), Hydrometeor scatter (Mode 2) ) L(%)=P t +G e +G x -P r (%) ex: Gx = 45 dbi, Pt= -3 dbw, p(0.0015%) for GHz AP7 Table 8 (Mode1) (Mode2) L(%)=P t +G x -P r (%) Hydrometeor scatter Pt * Gx Pr(p) Ge (10 to 123 Km/f) Minimum Coordination Distance Maximum Calculation Distance (369/ Mode2 up to 1200 Km/ Mode1*Zone C)
14 Coordination area of Rcv GSO ES (FSS) with respect to Tx Terrestrial stations (FS) 5E 10E 15E 20E 25E MCO SMR SRB CVA MNE MKD BUL I ALB GRC MLT TUN LBY Freq: GHz Sat longitude : 1 W 30N 30N Horizon Ele. Anagle : 0 Affected countries: 5E 10E 15E 20E ALB GRC I LBY TUN
15 Contour of Opposite direction 1 Appendix 7 - Annex 3 & 5 + Table 9 Worst Case Scenario (for Rx E/S) Horizon ele. angle (Rx E/S) = 0 Orbit inclination = 0 Anywhere in GSO orbit (> εmin ) Same latitude with Tx E/S Find Min. separation Angle of Rx E/S (for Azimuths) Calculate Distance with Off Axis Rx Gain AP7 Table 9 TRANSMITTING EARTH STATION Receiving Earth Station Min. Separation Angle + Off Axis Rx Gain
16 Contour of Opposite direction 2 Appendix 7 - Annex 5 + Table 9 Worst Case Scenario + (as Mode1) Plane geometry approximation Rx E/S operates at Min. Ele. angle Beam intersection under Rain height Apply Geometrical construction Min. Coor. Distance (for some Azimuths) two 6 sectors => worst-case distance No auxiliary contours (No calculation) N - αw αw 3 3 demax hr demax 3 3 Tx E/S ds hr : rain height ds : horizontal distance αw : Azimuth to possible Rx E/S (by Latitudes, εmin) demax : Max calculation distance by hr
17 Coordination area of Tx GSO ES (FSS) with respect to Rcv GSO ES (EESS) Freq: GHz Sat longitude : 1 W Horizon Ele. Anagle : 0 Affected countries: I TUN
18 Coordination area of Tx NGSO ES (FSS) with respect to Rcv GSO ES (EESS) 50N 0 5E LUX 10E 50N Earth station (NGSO) No Mode2 contours D F SUI LIE Tracking Antenna reduce the probability of Mode2. 45N I 45N Main Mode 1 SMR AND MCO Aux. Mode 1 0 5E 10E
19 Coordination Area of Mobile Earth Stations For a mobile earth station, the periphery of the service area is extended by the coordination distance (calculated or predetermined). Calculated Mobile Earth Station Service Area Coordination Area
20 Predetermined Coordination distance (Table 10 of Appendix 7) Predetermined AP7 Table 10 (Example Adm: KOR) Typical, 100Km Typical, 400Km Typical, 500Km Typical, 580Km 125E 130E 120E 125E 130E 135E 115E 120E 125E 130E 135E 140E 115E 120E 125E 130E 135E 140E 45N 45N KRE KRE KRE KRE KOR KOR KOR J KOR J J CHN CHN J 30N 30N 30N 30N 30N 30N 125E 130E 120E 125E 130E 135E 120E 125E 130E 135E 120E 125E 130E 135E Typical, 1000Km Typical, 1080Km Specific, 100Km Specific, 580Km 105E 110E 115E 120E 125E 130E 135E 140E 145E 150E 105E 110E 115E 120E 125E 130E 135E 140E 145E 150E 125E 130E 120E 125E 130E 135E 45N 45N 45N 45N KRE KRE KRE KRE KOR J KOR J KOR 30N CHN 30N 30N CHN 30N KOR 25N 25N 25N 25N J MACHKG 20N MACHKG 20N 115E 120E 125E 130E 135E 140E 115E 120E 125E 130E 135E 140E 125E 130E 120E 125E 130E
21 APPENDIX 7 Definition of the Coordination Area 315 F SUI D 0 SVK AUT HNG SVN HRV ROU 45 Coordination contours with the greatest coordination distance E I BIH YUG MKD BUL However 270 MLT ALB GRC TUR It represents a regulatory concept based on Worst Cases & Conservative Assumptions. 90 ALG TUN i.e. EGY It s not a exclusion zone. 225 Mode(1) Mode(2) 180 LBY means More 135 detailed calculations and discussions need to be performed.
22 Coordination data (Appendix 4) Annex 2 GEOGRAPHICAL DATA SATELLITE ANTENNA SIGNAL CHARACTERISTICS Others (Earth station s) Location, Altitude Orbital Location, Identification (Geo, Non-Geo) Maximum gain Radiation pattern Power Maximum Power Density Frequencies Noise temperature Emission Type Horizontal Elevation Angle
23 Horizontal Elevation Angles All Azimuths around Earth Station Ant. if no values between Average value No values default 0 degree Azimuth x5 o. Azimuth x4 o. Azimuth x 3 o. Azimuth x2 o. Azimuth x o. Azimuth x1 o HE Angle 4 HE Angle HE Horizon 5 Angle Elevation 2 HE Angle Angle HE 3 Angle 1 Earth station
24 Effect of Horizon Elevation Angle RECEIVING EARTH STATION COORDINATION AREAS MAGHTAB MLT/MLT 014E MHZ E F SUI I D AUT SVN SVK HNG ROU HRV BIH YUG BUL MKD MDA UKR E F SUI D I SVK AUT HNG SVN HRV BIH YUG MKD ROU BUL ALB GRC TUR ALB GRC TUR MLT MLT TUN TUN ALG ALG EGY EGY LBY LBY Reduced Coordination Area HORIZON ELEVATION ANGLE : 0 o HORIZON ELEVATION ANGLE: Actual Value
25 Tips for Coordination? AP7 embedded in GIBC More practical consideration on the Coordination Area Auxiliary Contour Extra coordination lines inside main contour It s all Complementary information.
26 Auxiliary Contour - Mode 1 (& 2) Appendix 7 - Annex 6 Extra coordination lines inside main contour (decided between ADMs) Country B Coordination contour (Gx=50 dbi) Country A - 5 db Auxiliary contour (Gx = 45 dbi) - 10 db Auxiliary contour (Gx = - 40 dbw)
27 Auxiliary Contour - Mode 1 45N I HRV 45N Auxiliary Contour (ex. -5,-10,-15 db) BIH MCO SMR Mode 1 CVA
28 Auxiliary Contour - Mode 2 Appendix 7 - Annex 6 (from WRC-2000) Beam Avoidance Angle = X Protection Angle Critical Angle Earth Station Extra coordination lines inside main contour (decided between ADMs)
29 Auxiliary Contour - Mode 2 HOL BEL 50N LUX 50N SUI F 0 5E
30 Response by Administration B (to Coordination Request from A) A Coordination Request AP4 Annex2 Data AP7 Contours Acknowledge of receipt Technical Examination Collect existing and planned system in 3 years Inside Coordination Contours 4 Months Administration A Request additional Info. (if it is necessary ) Agreement (Art. 9.52B) Inclusion of B s systems into use in 3 years Administration B Notification for Adm B s system TS+ES(ODT) in 3 years Bringing into use Disagreement (Art 9.52) Adm B s assignment Suggestion for resolution Notification for Adm B s system Bringing into use TS in 3 Months ES(ODT) in 3 years ITU
31 Result of WRC-12 No major change in AP7 Some frequencies/services were deleted/added in Table 7 9. It s consequential arrangement with regards to Art 5 & footnotes.
32 3 Things to Do on Coordination of Earth Stations
33 Question? Answer! if
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