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
  
• Alexandre Vassiliev(e-mail alexandre.vassiliev_at_i
  tu.int)

2
What Is the Purpose of SPS?

• To determine the coordination requirements for
  space network belonging to the planned services -
  Appendices 30, 30A, Resolution 542 (WRC-2000) and
  Appendix 30B to the Radio Regulations.
• 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 the 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.).
  
• Etc.

3
Plans/Lists Covered by SPS

• WRC-2000 BSS Downlink Plan and List of Additional
  Uses for Regions 1 and 3 Appendix 30, Resolution
  542 (WRC-2000).
  
• WRC-2000 Regions 1 and 3 14 GHz and 17 GHz
  Feeder-link Plans and Lists of Additional Uses
  Appendix 30A, Resolution 542 (WRC-2000).
  
• RARC BC SAT '83 combined feeder/down link Plan
  for Region 2 Appendices 30, 30A.
  
• WARC ORB '88 FSS Plans in 6/4 GHz and in 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 tes
t 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)
• antenna polarization type circular (left and
  right) and/or linear (except FSS Plans)
  
• polarization angle - for linear polarization
  (except FSS Plans) 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
  Plans).

9
Propagation Loss in Compatibility Analysis

• The following propagation factors are taken into
  account in the analysis
  
• free-space loss (for all Plans)
• atmospheric attenuation (Region 2 BSS Plan
  only)
  
• atmospheric absorption (Region 2 BSS Plan only)
• rain attenuation (Region 2 BSS Plan Regions 13
  Feeder-link Plans/Lists Power Control)
  
• rain depolarization (Region 2 BSS Plan Regions
  13 Feeder-link Plans/Lists Power Control)

10

• Broadcasting Satellite Service (BSS)
  Plans/Lists.
  
• Appendices 30, 30A and Resolution 542 (WRC-2000).

11
Compatibility Criteria (1)

• A wanted BSS assignment may receive co-channel
  and adjacent channel interference. It was decided
  to employ Equivalent Protection Margin (EPM) or
  Overall EPM (OEPM) as compatibility criterion for
  BSS Plans

Where n3 for Regions 1 and 3 and n5 for Regio
n 2 i - interference category (1 - co-channel, 2
- first lower adjacent channel, 3 - first upper
adjacent channel, 4 - second lower and 5 - second
upper adjacent channels)
- protection ratio for a given (i) interference
category
12
Difference between Regions 1 3 Approach (EPM)
and Region 2 Approach (OEPM)
13
Compatibility Criteria (2)

• Regions 1 and 3 BSS Down-link Plan/List
  (WRC-2000)
  
• An assignment of the down-link Plan/List is
  considered as being affected as a result of
  addition / modification of an assignment(s) if 2
  conditions are met
• 1. under assumed free-space propagation
  conditions, the Power Flux Density (PFD) value
  derived from the PFD mask(s) given in paragraph
  a) of Section 1 of Annex 1 to Appendix 30 is
  exceeded at least at one of the test points of
  the wanted assignment AND
• 2. the reference EPM at least at one of the test
  points of that wanted assignment falls more
  than 0.45 dB below 0 dB, or, if already negative,
  more than 0.45 dB below that reference situation
  value.

14
Compatibility Criteria (3)
Regions 1 and 3 Feeder-link Plans/Lists
(WRC-2000) An assignment of a feeder-link Pla
n/List (wanted assignment) is considered as
being affected as a result of addition of new
assignment(s) or modification of an existing
one(s) if the reference EPM at least at one of
the test points of that wanted assignment falls
more than 0.45 dB below 0 dB, or, if already
negative, more than 0.45 dB below that reference
situation value.
15
Compatibility Criteria (4)

• Region 2 BSS Plan
• A modification to Region 2 Plan considered to be
  compatible with other assignments in the Plan or
  earlier submitted additions/modification to the
  Plan
• if the calculated OEPM values of the assignments
  in the Plan and earlier submitted modifications
  for all channels/test points are greater than
  -.25 dB, OR
• if OEPM is already negative, its degradation in
  negative area resulting from this modification is
  less than 0.25 dB comparing with the OEPM value
  for the same channel/test point calculated before
  that modification was included in analysis.

16
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
17
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.

18

• Fixed Satellite Service (FSS) Plans Appendix 30B.

19
Compatibility Criteria for FSS Plans

• Two main criteria are used for FSS Plans
• aggregate C/I value should be 26 dB to consider
  modification/addition to be compatible with the
  Plan
  
• single-entry C/I value which should be 30 dB
  (value may be increased in when macrosegmentation
  concept is applied) to consider
  modification/addition to be compatible with the
  Plan. The single-entry C/I calculated for each
  pair of the wanted and an interfering assignments
  (interference from one interfering source).
• Appendix 8 method/criterion (?T/T) is also used
  for compatibility analysis with the existing
  networks.
  

20
Specificity of the FSS Plans

• Technical aspects
• includes allotments/assignments with both feeder
  and down links and allotments/assignments having
  only feeder or down-link
  
• have different protection criteria (Appendix S8)
  for determination of compatibility between the
  existing systems
  
• employ so-called Macrosegmentation concept (
  Annex 3B) upper 60 of each allotment band is
  used for high-density carriers and the lower 40
  for low-density carries (leads to a messy
  situation when it is not respected)
• different single-entry C/I criterion in case when
  an allotment is not in consistency with Annex 3B
  (Macrosegmentation)
  
• predetermined arc concept (PDA) pre-design stage
  ?10? design stage ?5?, operational state 0 ?
  

21

• C/I, C/N and I/N Analysis in non-planned bandsin
  accordance with Articles 9, 11 of the Radio
  Regulations NOT CONSIDERED IN THIS PRESENTATION

22
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 convert input data, etc.
  
• However, SPS also has many modules, objects /
  components and libraries hidden from the user.
  

23
SPS GeneralStructure
24
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 Plans and Articles 9/11 C/I analysis in
  the future).
• Format of input data is described in the SPS
  Users Manual.

25
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 Plans
  and Articles 9/11 C/I analysis
• RTF and graphical reports on the screen -
  currently used for BSS Plans/Lists only to be
  expanded for FSS Plans and Articles 9/11 C/I
  analysis.

26
Starting MSPACEg (input/output options)
4
1
5
6
27
MSPACEg Compressed Report

• Different Reports with information concerning
  affected assignments/allotments. 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.
28
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
  Plans/Lists.

30
Reference Situation Report
Criteria used for data retrieval
31
Graphical Report.Regions 13 Down-link
Applying both EPM and PFD criteria.
32
Fragment of Findings Report (FSS)
MSPACEG Version 2.110 (MS Windows)
30.09.2002 180440 ITU Appendix 30B Ana
lysis at 13/10-11 GHz
RS19K.INP, USASAT-13I and USASAT-26 networks
are recorded... FINDING FOR BEAM USA26G0
0 NOT IN COMPLIANCE WITH ANNEX 3B FREQUE
NCY 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 INSTEAD OF 30.0 dB
. . Appendix 30B Analysis Wanted
TP TP New Ref
Interfering Type Beam Long Lat
C/I C/I Degradation Beam
S.E. ALS00000 172.00 54.00 29.57 29.
64 0.07 URSEEDRL S.E. USA13I00
-89.10 13.40 25.99 34.50 8.51
USA26G00 S.E. USA13I00 -87.58 13.00 26.
30 34.50 8.20 USA26G00
AGG. USA13I00 -83.67 10.83 21.32
21.38 0.06 . .
33
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 GS
AT 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 0.0
00 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 Gai
n (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 -18
1.988 999.900 0.209 1 0.000 -182.690 .
. ..And many other details
34
References

• Appendices 30, 30A, 30B and Articles S9, S11 of
  the Radio Regulations
  
• Final Acts RARC-83, WARC-88, WRC-2002
• Resolution 542 (WRC-2000)
• Space Plans System Software Package (includes
  documentation) Version 2.11, September 2002.
  Distributed on SRS-on-CD 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