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Slide 1 World Radiocommunication Seminar Geneva 15 – 19 November 2004 International Telecommunication Union Radiocommunication Bureau Space Plans System.

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Presentation on theme: "Slide 1 World Radiocommunication Seminar Geneva 15 – 19 November 2004 International Telecommunication Union Radiocommunication Bureau Space Plans System."— Presentation transcript:

1 Slide 1 World Radiocommunication Seminar Geneva 15 – 19 November 2004 International Telecommunication Union Radiocommunication Bureau Space Plans System (SPS) Software for Determination of Coordination Requirements for Space Networks of the Planned Services Nelson Malaguti

2 Slide 2 World Radiocommunication Seminar Geneva 15 – 19 November 2004 What Is the Purpose of SPS? u To determine the coordination requirements for space networks belonging to the planned services - Appendices 30, 30A and 30B to the RR. u To optimise parameters of new networks belonging to the planned services (reduce number of affected). u To estimate negative effect of newly submitted networks or modifications to existing ones. u To perform C/I, C/N calculations under Articles 9 and 11 of the Radio Regulations. u To do What If Studies (find the most affected test points, channels, beams, etc.).

3 Slide 3 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Plans and Lists Covered by SPS u BSS Downlink Plan and List of Additional Uses for Regions 1 and 3; Appendix 30. u Regions 1 and 3 14 GHz and 17 GHz Feeder-link Plan and List of Additional Uses; Appendix 30A. u Combined feeder/down link Plan for Region 2; Appendices 30 and 30A. u FSS Plan and List in the 6/4 GHz and 13/10-11 GHz bands; Appendix 30B.

4 Slide 4 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Plans Basic Technical Principles Consideration of aggregate interfering effect from all existing and virtual (e.g. included in the Plan/List but not operational) interfering sources (different comparing with networks belonging to non-planned services). Examination of non-planned networks is based on single-entry criteria (no summing up interference from different satellites).

5 Slide 5 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Plans Basic Technical Principles Consideration of the worst test point. Calculate aggregate interference for all test points and consider the test point with the lowest wanted signal and the highest interference level.

6 Slide 6 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Geo-geometrical Factors Taken into Account in Compatibility Analysis The effect of the following factors on wanted and interfering signals is taken into account: u space station keeping accuracy (in East/West direction only); u space station antenna rotation accuracy; u space station antenna pointing accuracy. Earth station antenna considered to be fixed and properly pointed to the wanted satellite.

7 Slide 7 World Radiocommunication Seminar Geneva 15 – 19 November 2004 An Illustration of the Space Station Antenna Rotation Accuracy A test point which was originally inside of 3 dB antenna gain contour is outside of that contour when we take into account the space station antenna rotation accuracy.

8 Slide 8 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Antenna Characteristics Taken into Account in Compatibility Analysis The following antenna (transmitting and receiving) characteristics are taken into account in the analysis: u antenna patterns (for all Plans/Lists); u antenna polarization type circular (left and right) and/or linear (except FSS Plan/List); u polarization angle - for linear polarization (except FSS Plan/List) and relative alignment angle between 2 linearly polarized signals (Rec. ITU-R BO.1212); u polarization discrimination with and/or without depolarization induced by rain (except FSS Plan/List).

9 Slide 9 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Propagation Loss in Compatibility Analysis The following propagation factors are taken into account in the analysis: u free-space loss (for all Plans/Lists); u atmospheric attenuation (Region 2 BSS Plan only); u atmospheric absorption (Region 2 BSS Plan only); u rain attenuation (Region 2 BSS Plan); u rain depolarization (Region 2 BSS Plan)

10 Slide 10 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Broadcasting Satellite Service (BSS) Plans/Lists. Appendices 30 and 30A.

11 Slide 11 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Difference between Regions 1 & 3 Approach (EPM) and Region 2 Approach (OEPM)

12 Slide 12 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Non-standard Channeling in BSS Plans/Lists There are many submissions having so-called non-standard emissions (digital and analogue) with non-standard bandwidth and/or non-standard assigned frequency, e.q.: real (if any) overlap is taken into account in calculations

13 Slide 13 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Grouping in the BSS Plans/Lists Mainly utilized for: simulation of several emissions not transmitted simultaneously; changing the orbital position. Only one (the worst) interfering signal is selected during EPM/OEPM calculation but all members of the group are protected.

14 Slide 14 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Space Plans System Structure From the users point of view SPS consists of 3 main components: u technical examination software (MSPACE_G graphical user interface and MSPACEg program for compatibility analyses); u SPS reporting tool (SPS_REPORTs); u utilities to update reference situation of BSS and FSS Plans/Lists. However, SPS also has many modules, objects / components and libraries hidden from the user.

15 Slide 15 World Radiocommunication Seminar Geneva 15 – 19 November 2004 SPS Input Data MSPACEg requires an input file containing the parameters for the particular Plan/List, or portion of a Plan/List, to be analyzed. There are major formats used for Plans/Lists input data: u MSPACEg ASCII (text) input file (used from the first version of MSPACEg software up to now and should be completely suppressed in the future); u Integrated SNS/SPS database format (currently used for BSS Plans/Lists and should be also used for FSS Plan/List in the future). Format of input data is described in the SPS Users Manual.

16 Slide 16 World Radiocommunication Seminar Geneva 15 – 19 November 2004 SPS Output Data SPS produces many reports / output files. MSPACEg creates few reports itself and the SPS Reporting Tool also produces others in accordance with the user request(s). There are three main types of output data: u ASCII (text) files with analysis results; u relational database with analysis results in MS ACCESS container - currently used for BSS Plans/Lists only; to be expanded for FSS Plan/List; u RTF and graphical reports on the screen - currently used for BSS Plans/Lists only; to be expanded for FSS Plan/List.

17 Slide 17 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Starting MSPACEg (input/output & options)

18 Slide 18 World Radiocommunication Seminar Geneva 15 – 19 November 2004 MSPACEg Compressed Report (for BSS Plans/Lists only) MSPACEg produces compressed report when it is running: Satellite orbital position Admini stration symbol Affected channels identified using PFD criterion Affected channels identified using EPM criterion Max. PFD excess Max. EPM degrad. Affected channels identified using EPM & PFD criteria(final) Fin.max. PFD excess Fin.max. EPM degrad. Satel- lite name Beam name

19 Slide 19 World Radiocommunication Seminar Geneva 15 – 19 November 2004 SPS Reporting Tool (SPS_Reports) (for BSS Plans/Lists only)

20 Slide 20 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Compressed Report; Printed Version Three formats (on the screen or printed – below): u report for Region 2 Plan; u report for Regions 1 and 3 Down-link Plan/List; u report for Regions 1 and 3 Feeder-link Plan/List.

21 Slide 21 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Reference Situation Report Criteria used for data retrieval

22 Slide 22 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Graphical Report. Regions 1&3 Down-link Applying both EPM and PFD criteria.

23 Slide 23 World Radiocommunication Seminar Geneva 15 – 19 November 2004 Fragment of Findings Report (FSS) MSPACEG Version (MS Windows) :29:29 ITU Appendix 30B Analysis at 13/10-11 GHz Reference situation after introduction of …… (network, subregional system) *** FINDING FOR BEAM USA26G00 *** NOT IN COMPLIANCE WITH ANNEX 3B FREQUENCY BELOW WHICH PEAK/AVERAGE POWER IS LESS THAN 5 dB IS THIS IS LOWER THAN 40 % OF THE BAND AND THEREFORE OTHER BEAMS WILL BE CONSIDERED TO BE AFFECTED IF THE SINGLE ENTRY C/I IS LESS THAN dB (OR THE LOWEST ALREADY ACCEPTED) INSTEAD OF 30.0 dB. Appendix 30B Analysis Wanted TP TP New Ref Interfering Type Beam Long Lat C/I C/I Degradation Beam AGG. ARS S.E. ARS BEL AGG. BUL S.E. BUL BEL00000.

24 Slide 24 World Radiocommunication Seminar Geneva 15 – 19 November 2004 A Fragment of a Detailed Report Desired Uplink Frequency: MHz; (Channel 7) Sat. Max. Gain: dBi; Transmitter Power: dBW (NON-STANDARD) Pt Spnt Phi FS Atm Rain GSAT GSAT GES GES Num Err Phi Not Loss Loss Loss Copol X-pol Copol X-pol X-pol Equiv Cup Min Discr Gain (K) Cup Uplink Interference Power to AFS02100, Channel 7: Pol QRM QRM QRM QRM Topoc FS Atm Rain GSAT GSAT GES GES [Beta] Ind Chan Pwr Pt Angle Loss Loss Loss Copol X-pol Copol X-pol X-Pol X-Pol X-pol Equiv Int Adjust QRM Discr Gain CAT Factor Up ……………………………………………………..And many other details

25 Slide 25 World Radiocommunication Seminar Geneva 15 – 19 November 2004 References Appendices 30, 30A, 30B and relating Rules of Procedure Final Acts RARC-83, WARC-88, WRC-2000, WRC- 03 Space Plans System Software Package (includes documentation) Version 5.001, November Distributed on SRS-on-CD, BRIFIC and also available from the ITU Web page: ITU Web side


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