International Telecommunication Union Radiocommunication Bureau

1
International Telecommunication
UnionRadiocommunication Bureau

• Space Plans System (SPS)
• Software for Determination of Coordination
  Requirements for Space Networks of the Planned
  Services
• Nelson Malaguti(nelson.malaguti_at_itu.int)

2
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.).

3
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.

4
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
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
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.

7
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
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).

9
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)

10

• Broadcasting Satellite Service (BSS) Plans/Lists.
• Appendices 30 and 30A.

11
Difference between Regions 1 3 Approach (EPM)
and Region 2 Approach (OEPM)
12
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
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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
Space Plans System Structure

• From the users 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.

15
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
• 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
  Users Manual.

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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
• 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.

17
Starting MSPACEg (input/output options)
4
1
5
6
18
MSPACEg Compressed Report (for BSS Plans/Lists
only)

• MSPACEg produces compressed report when it is
  running

Administration symbol
Affected channels identified using EPM PFD
criteria(final)
Satel-lite name
Affected channels identified using EPM criterion
Beam name
Satellite orbital position
Affected channels identified using PFD criterion
Max. PFD excess
Max. EPM degrad.
Fin.max. PFD excess
Fin.max. EPM degrad.
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SPS Reporting Tool (SPS_Reports) (for BSS
Plans/Lists only)
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Compressed Report Printed Version

• Three 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.

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Reference Situation Report
Criteria used for data retrieval
22
Graphical Report.Regions 13 Down-link
Applying both EPM and PFD criteria.
23
Fragment of Findings Report (FSS)
MSPACEG Version 5.001 (MS Windows)
18.11.2004 102929 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 . .
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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 Min Discr Gain (K)
Cup 999.900 91.912 -91.287
-91.934 999.900 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
QRM Discr Gain CAT Factor Up 999.900
0.967 1 0.000 -181.988 999.900 0.209 1
0.000 -182.690 .. ..And
many other details
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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_file
  s/index.html
• ITU Web side http//www.itu.int