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Slide 1
World Radiocommunication Seminar Geneva 15 – 19 November 2004
International Telecommunication UnionRadiocommunication Bureau
Space Plans’ System (SPS)Software for Determination of Coordination Requirements for
Space Networks of the Planned Services Nelson Malaguti
Slide 2
World Radiocommunication Seminar Geneva 15 – 19 November 2004
What Is the Purpose of SPS?
To determine the coordination requirements for space networks belonging to the planned services - Appendices 30, 30A and 30B to the RR.
To optimise parameters of new networks belonging to the planned services (reduce number of affected).
To estimate negative effect of newly submitted networks or modifications to existing ones.
To perform C/I, C/N calculations under Articles 9 and 11 of the Radio Regulations.
To do “What If Studies” (find the most affected test points, channels, beams, etc.).
Slide 3
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Plans and Lists Covered by SPS
BSS Downlink Plan and List of Additional Uses for Regions 1 and 3; Appendix 30.
Regions 1 and 3 14 GHz and 17 GHz Feeder-link Plan and List of Additional Uses; Appendix 30A.
Combined feeder/down link Plan for Region 2; Appendices 30 and 30A.
FSS Plan and List in the 6/4 GHz and 13/10-11 GHz bands; Appendix 30B.
Slide 4
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Plans’ Basic Technical Principles
Wan
ted S
ign
al
InterferingEmissions
1 32
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).
IIII aggr 321
Examination of “non-planned” networks is based on single-entry criteria (no summing up interference from different satellites).
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.
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:
space station keeping accuracy (in East/West direction only);
space station antenna rotation accuracy; space station antenna pointing accuracy.
Earth station antenna considered to be fixed and properly pointed to the wanted satellite.
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.
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:
antenna patterns (for all Plans/Lists); antenna polarization type circular (left and right)
and/or linear (except FSS Plan/List); polarization angle - for linear polarization (except
FSS Plan/List) and relative alignment angle between 2 linearly polarized signals (Rec. ITU-R BO.1212);
polarization discrimination with and/or without depolarization induced by rain (except FSS Plan/List).
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:
free-space loss (for all Plans/Lists); atmospheric attenuation (Region 2 BSS Plan only); atmospheric absorption (Region 2 BSS Plan only); rain attenuation (Region 2 BSS Plan); rain depolarization (Region 2 BSS Plan)
Slide 10
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Broadcasting Satellite Service (BSS) Plans/Lists.
Appendices 30 and 30A.
Slide 11
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Difference between Regions 1 & 3 Approach (EPM) and Region 2 Approach (OEPM)
Regions 1 and 3 Approach(separated links)
Region 2 Approach(overall link analyses)
EPMDown OEPM
EPMUp
In terference Interference
Interference Interference
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.:
Assigned F requencies of W anted andInterfering S ignals and Bandw idth (27M H z) as D efined in Appendices S30, S30Afor R egions 1 & 3
"Standard" Overlap
W anted S ignal and In terfering S ignal both use27 M H z Bandw idth and both have ShiftedAssigned F requenciesOverlap greater than "Standard" Overlap
W anted S ignal w ith Bandw idth 27 M H z andInterfering S ignal w ith Bandw idth 33 M H z andboth have Shifted Assigned F requenciesOverlap smaller than "Standard" Overlap
27 M Hz
27 M Hz
33 M Hz
27 M Hz
27 M Hz
27 M Hz
“real” (if any) overlap is taken into account in calculations
Slide 13
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Grouping in the BSS Plans/Lists
DownEPM
GroupedInterferingEm issions
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.
Slide 14
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Space Plans’ System Structure
From the user’s point of view SPS consists of 3 main components:
technical examination software (MSPACE_G graphical user interface and MSPACEg program for compatibility analyses);
SPS reporting tool (SPS_REPORTs); 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.
Slide 15
World Radiocommunication Seminar Geneva 15 – 19 November 2004
SPS Input DataMSPACEg 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: MSPACEg ASCII (text) input file (used from the first version of MSPACEg software up to now and should be completely suppressed in the future); 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 User’s Manual.
Slide 16
World Radiocommunication Seminar Geneva 15 – 19 November 2004
SPS Output DataSPS 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:ASCII (text) files with analysis results;relational database with analysis results in MS ACCESS container - currently used for BSS Plans/Lists only; to be expanded for FSS Plan/List;RTF and graphical reports on the screen - currently used for BSS Plans/Lists only; to be expanded for FSS Plan/List.
Slide 17
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Starting MSPACEg (input/output & options)
4
56
1
3
2
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
Administration 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
Slide 19
World Radiocommunication Seminar Geneva 15 – 19 November 2004
SPS Reporting Tool (SPS_Reports) (for BSS Plans/Lists only)
Slide 20
World Radiocommunication Seminar Geneva 15 – 19 November 2004
“Compressed Report”; Printed VersionThree formats (on the screen or “printed” – below): report for Region 2 Plan; report for Regions 1 and 3 Down-link Plan/List; report for Regions 1 and 3 Feeder-link Plan/List.
Slide 21
World Radiocommunication Seminar Geneva 15 – 19 November 2004
“Reference Situation” ReportC
rite
ria
use
d f
or
dat
a re
trie
val
Slide 22
World Radiocommunication Seminar Geneva 15 – 19 November 2004
“Graphical” Report.Regions 1&3 Down-link
Applying both EPM and PFD criteria.
Slide 23
World Radiocommunication Seminar Geneva 15 – 19 November 2004
Fragment of Findings’ Report (FSS)MSPACEG Version 5.001 (MS Windows) 18.11.2004 10:29:29 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 12.75000 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 34.50 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. ARS00000 34.42 28.08 24.87 26.00 1.13 S.E. ARS00000 34.42 28.08 26.06 30.00 3.94 BEL00000..
AGG. BUL00000 22.75 44.17 25.15 26.00 0.85 S.E. BUL00000 22.75 44.17 27.37 30.00 2.63 BEL00000..
Slide 24
World Radiocommunication Seminar Geneva 15 – 19 November 2004
A Fragment of a Detailed Report
Desired Uplink Frequency: 14640.38 MHz; (Channel 7) Sat. Max. Gain: 37.24 dBi;Transmitter Power: 25.00 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 1 0.1 1.426 2.824 207.116 0.000 0.000 34.182 2.240 57.000 22.000 2 0.1 1.235 2.803 207.199 0.000 0.000 34.912 2.240 57.000 22.000
X-pol Equiv Cup MinDiscr Gain (K) Cup999.900 91.912 -91.287 -91.934999.900 91.912 -91.287 -91.934..
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 12 7 25.00 1 55.8233 207.954 0.000 0.000 8.078 0.000 -10.000 -10.000 X-Pol 12 7 25.00 2 56.0780 207.899 0.000 0.000 7.002 0.000 -10.000 -10.000
X-pol Equiv Int Adjust QRMDiscr Gain CAT Factor Up999.900 0.967 1 0.000 -181.988999.900 0.209 1 0.000 -182.690
.. ……………………………………………………..And many other details
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 2004. Distributed on SRS-on-CD, BRIFIC and also available from the ITU Web page: http://www.itu.int/ITU-R/space/plans/MSPACEg_files/index.html
ITU Web side http://www.itu.int