Satellite Coordination. R. J. Cohen. 13th June 2002. Jodrell Bank Observatory University of Manchester. Outline of Presentation What is Coordination? Regulatory Requirements Satellite Downlinks MES Uplinks Paper Satellites WRC-03 Issues. What is Coordination?
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
R. J. Cohen
13th June 2002
Jodrell Bank Observatory
University of Manchester
Before an administration allows an operator to commence operation of a new system, other administrations likely to be affected must be informed and agree to technical and operational parameters, perhaps with conditions.
Once coordination is completed the system can be registered with the IFRB on the Master International Frequency Register.
Systems so registered acquire protected status (even if not implemented) and incoming systems must coordinate with them.
Coordination is critical for satellite systems.
Coordination, notification and recording of frequency assignments and Plan modifications
Article 7 Application of the procedures
Article 8 Status of frequency assignments recorded in the Master International Frequency Register
Article 9 Procedure for effecting coordination with or obtaining agreement of other administrations
Article 11 Notification and recording of frequency assignments
Article 12 Seasonal planning of the HF bands allocated to the broadcasting service between 5900 kHZ and 26 100 kHz
Article 13 Instructions to the Bureau
Section I - Assistance to administrations by the Bureau
Section II – Maintenance of the Master Register and of World Plans by the Bureau
Section III – Maintenance of the Rules of Procedure by the Bureau
Section IV – Board documents
Article 14 Procedure for the review of a finding or other decision of the Bureau
However, if the administration which requested the review disagrees with the Board’s decision it may raise the matter at a world radiocommunication conference.
Procedure for effecting coordination with or obtaining agreement of other administrations
Section I – Advance publication of information on satellite networks or satellite systems
not earlier than five years and preferably not later than two years before the planned date of bringing into use
characteristics to be provided are listed in Appendix 4
Section II – Procedure for effecting coordination
administrations have four months to respond
Footnote 9.50.1 In the absence of specific provisions in these Regulations relating to the evaluation of interference, the calculation methods and the criteria should be based on the relevant ITU-R Recommendations agreed by the administrations concerned. In the event of disagreement on a Recommendation or in the absence of such a Recommendation, the methods and criteria shall be agreed between the administrations concerned. Such agreements shall be concluded without prejudice to other administrations.
The administrations may agree to use Rec. RA.769-1
Consolidated list and table of characteristics for use in the application of the procedures of Chapter III
Annex 1A: List of characteristics of stations in the terrestrial services
Annex 1B: Table of characteristics to be submitted for stations in the terrestrial services
Annex 2A: Characteristics of satellite networks or earth or radio astronomy stations
Annex 2B: Table of characteristics to be submitted for space and radio astronomy services
A.17 Compliance with aggregate power flux-density limits
(a) NGSO satellites of RNSS in band 5010-5030 MHz, aggregate pfd into the bands 5030-5150 MHz and 4990-5000 MHz (5.553B)
(b) NGSO FSS satellites in band 41.5-42.5 GHz into the band 42.5-43.5 GHz for >2% of time (5.551G)
(c) RNSS in band 1164-1215 MHz
(d) NGSO FSS satellites in band 15.34-15.63 GHz aggregate pfd into band 15.35-15.4 GHz (5.511A)
Methods for the determination of the coordination area around an earth station in frequency bands between 100 MHz and 105 GHz
96 pages: includes antenna gain, propagation model
Terrestrial and space services sharing frequency bands above 1 GHz
Section V – Limits of power flux-density from space stations (Table 21-4). Higher pdf is allowed at higher elevation angles!
Section II - Control of interference to geostationary-satellite systems (Tables 22-1 to 22-4 give epfd limits)
Section V – Radio astronomy in the shielded zone of the Moon
Aggregate power flux density W m-2 Hz-1 from a constellation of satellites is averaged over all directions of arrival equally (0dBi).
Equivalent power flux density (Article 22.5C1) from a constellation of satellites is a weighted average taking into account the off-axis discrimination of the transmitter and a reference antenna, each assumed to be pointing in its nominal direction.
Epfd was developed for GSO (BSS and FSS) and NGSO sharing studies. It is now the favoured approach for radio telescopes, using a Monte Carlo method to simulate a range of observing situations.
The philosophy behind the Monte Carlo approach is that worst-case situations are rare. Most of the time the sharing requirements are relaxed. Hence this approach is now used for MES, AMSS, unwanted emissions, … (any moving interferer)
A great many input parameters need to be agreed by all parties (emission masks, antenna patterns etc.); some parameters are commercially sensitive.
Software to calculate epfd is expensive.
Nobody has provided experimental data to confirm or deny the value of the Monte Carlo approach to sharing with radio astronomy.