International Telecommunication Union
Slide 1
Radiocommunication Bureau
Space Plans’ System (SPS)
Software for Determination of Coordination Requirements for
Space Networks of the Planned Services
Nelson Malaguti
(nelson.malaguti@itu.int)
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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.).
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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).
World Radiocommunication Seminar
nal
 I1  I 2  I 3
d Sig
aggr
te
Wan
I
1
2
3
Interfering
Emissions
Geneva 15 – 19 November 2004
Slide 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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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).
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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)
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 10
Broadcasting Satellite Service (BSS)
Plans/Lists.
Appendices 30 and 30A.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 11
Difference between Regions 1 & 3 Approach
(EPM) and Region 2 Approach (OEPM)
Interference
Ch
an
ne
l
4
4
l
ne
an
Ch
l
ne
an
Ch
Ch
an
ne
l
Interference
4
EPMUp
4
EPM Down
Interference
Interference
OEPM
Regions 1 and 3 Approach
Region 2 Approach
(separated links)
(overall link analyses)
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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.:
27 MHz
27 MHz
27 MHz
27 MHz
27 MHz
33 MHz
Assigned Frequencies of Wanted and
Interfering Signals and Bandwidth (27
MHz) as Defined in Appendices S30, S30A
for Regions 1 & 3
"Standard" Overlap
Wanted Signal and Interfering Signal both use
27 MHz Bandwidth and both have Shifted
Assigned Frequencies
Overlap greater than "Standard" Overlap
Wanted Signal with Bandwidth 27 MHz and
Interfering Signal with Bandwidth 33 MHz and
both have Shifted Assigned Frequencies
Overlap smaller than "Standard" Overlap
World Radiocommunication Seminar
“real” (if any)
overlap is
taken into
account in
calculations
Geneva 15 – 19 November 2004
Slide 13
Grouping in the BSS Plans/Lists
e
nc
ere
t ef
e
l In
nc
ita
er e
Dig
t ef
e In
gu
alo
d
te
an
W
g
Si
l
na
Only one (the worst)
interfering signal is selected
during EPM/OEPM
calculation but all members of
the group are protected.
Grouped
Interfering
Emissions
An
Mainly utilized for:
• simulation of several
emissions not transmitted
simultaneously;
• changing the orbital position.
EPMDown
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 14
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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 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 User’s
Manual.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 16
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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 17
Starting MSPACEg (input/output & options)
1 4
5
6
2
3
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 18
MSPACEg “Compressed Report”
(for BSS Plans/Lists only)
MSPACEg produces “compressed report” when it is running:
Admini
stration
symbol
Beam
name
Affected channels
identified using
EPM criterion
Affected channels
identified using EPM
& PFD criteria(final)
Satellite
name
Max.
Satellite Affected channels
Max.
Fin.max. Fin.max.
EPM
orbital
identified using PFD PFD
PFD
EPM
degrad 19 November 2004
World Radiocommunication Seminar
position
criterion
excess Geneva 15 – excess
degrad.
SPS Reporting Tool (SPS_Reports)
(for BSS Plans/Lists only)
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 19
Slide 20
“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.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Criteria used for
data retrieval
“Reference Situation” Report
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 21
“Graphical” Report.
Regions 1&3 Down-link
Applying both EPM and PFD criteria.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 22
Slide 23
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
Type
Wanted
Beam
TP
Long
TP
Lat
New
C/I
Ref
C/I
Degradation
Interfering
Beam
AGG.
S.E.
ARS00000
ARS00000
34.42
34.42
28.08
28.08
24.87
26.06
26.00
30.00
1.13
3.94
BEL00000
AGG.
S.E.
BUL00000
BUL00000
22.75
22.75
44.17
44.17
25.15
27.37
26.00
30.00
0.85
2.63
BEL00000
.
.
.
.
World Radiocommunication Seminar
Geneva 15 – 19 November 2004
Slide 24
A Fragment of a Detailed Report
Desired Uplink Frequency: 14640.38 MHz; (Channel
Transmitter Power: 25.00 dBW (NON-STANDARD)
Pt Spnt
Phi
FS
Num Err Phi
Not
Loss
1
0.1 1.426 2.824 207.116
2
0.1 1.235 2.803 207.199
X-pol
Discr
999.900
999.900
Equiv
Gain
91.912
91.912
Cup
(K)
-91.287
-91.287
Atm
Loss
0.000
0.000
Rain
Loss
0.000
0.000
GSAT
Copol
34.182
34.912
7) Sat. Max. Gain: 37.24 dBi;
GSAT
X-pol
2.240
2.240
GES
Copol
57.000
57.000
GES
X-pol
22.000
22.000
Min
Cup
-91.934
-91.934
.
.
Uplink Interference Power to AFS02100, Channel
Pol
QRM QRM
QRM QRM
Topoc
FS
Atm
[Beta] Ind Chan Pwr Pt
Angle
Loss Loss
X-Pol
12 7 25.00 1 55.8233 207.954 0.000
X-Pol
12 7 25.00 2 56.0780 207.899 0.000
X-pol
Discr
999.900
999.900
7:
Rain
GSAT GSAT
GES
GES
Loss Copol X-pol
Copol
X-pol
0.000 8.078 0.000 -10.000 -10.000
0.000 7.002 0.000 -10.000 -10.000
Equiv Int Adjust
QRM
Gain CAT Factor
Up
0.967 1
0.000 -181.988
0.209 1
0.000 -182.690
World Radiocommunication Seminar
.. ……………………………………………………..And many other details
Geneva 15 – 19 November 2004
Slide 25
References
Appendices 30, 30A, 30B and relating Rules of
Procedure
Final Acts RARC-83, WARC-88, WRC-2000, WRC03
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
World Radiocommunication Seminar
Geneva 15 – 19 November 2004