Telstar 11N Technical Manual - traveltronic · Telesat Telstar 11N Technical Manual _____ ESD-002...
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and
Security Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval
of Telesat.
Telesat
Telstar 11N
Technical Manual
2008 Edition
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and
Security Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval
of Telesat.
Telesat All rights reserved.
2008 Edition.
Printed in the USA.
Descriptions and content subject to change without notice.
Data contained herein represents typical spacecraft performance. As such, this data is not
transponder-specific and should not be used for detailed, final engineering design of
communications networks using Telstar satellites.
Revision Date Revised
By
Approved
By
Remarks
1.1 Jul 08 Engineering D. Gardner Initial Issue
1.2 Apr 09 Engineering D. Gardner Update to Transponder Frequency Plan
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and
Security Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval
of Telesat.
Table of Contents
Introduction ……………………………………………………………………………… 1
Technical Summary ……………………………………………………………………... 2
Technical Description …………………………………………………………………… 7
Ku-Band Payload Summary ……………………………………………….…………. 7
Connectivity ……………………………………………………….…….……………. 7
EIRP ………………………………………………………………………….……….. 7
G/T …..…………………….……………………………………………………….….. 7
Saturation Flux Density ……………………………………………………………….. 8
Fixed Gain Mode ……….……………………………………………….……………. 8
Automatic Level Control …………………………..…………………………………. 8
Polarization ……….……….……………………………………………….…………. 9
Cross-Polarization Isolation …………………………………………………...…...…. 9
Beacons …..………….………………………………..………………………..…..…. 9
Spacecraft Redundancy …………………………………………………………...…... 10
Appendix A – Supplemental Specifications .…………………………………………… 19
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and
Security Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval
of Telesat.
Figures
Figure 1: Telstar 11N Fully Deployed …………………………………………………….4
Figure 2: Telstar 11N Antenna Configuration …………………………………………….5
Figure 3: Telstar 11N Transponder Frequency Plan ………………………………………6
Figure 4: Telstar 11N Europe Transmit EIRP (dBW) ……………………………………11
Figure 5: Telstar 11N Europe Receive G/T (dB/K) ....……………………………………12
Figure 6: Telstar 11N Africa Transmit EIRP (dBW) ……………………………………..13
Figure 7: Telstar 11N Africa Receive G/T (dB/K) …....…………………………………..14
Figure 8: Telstar 11N US Transmit EIRP (dBW) …...…………………………………....15
Figure 9: Telstar 11N US Receive G/T (dB/K) ...................................................................16
Figure10: Telstar 11N AOR Transmit EIRP 9dBW) ............................................................17
Figure11: Telstar 11N AOR Receive G/T (dB/K) ................................................................18
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
1
Introduction
Telstar 11N, stationed at the 37.55 degrees West Longitude, expands the scope of Telesat Ku-
band satellite services. The state-of-the-art, high-power Telstar 11N communications satellite
offers increased coverage areas serving Europe/North Africa, North America, the Caribbean,
Atlantic Ocean Region (AOR) and West/South and Sub-Saharan Africa. From payload to
coverage areas, Telstar 11N has been designed to meet the highest performance objectives
including high reliability and a long operating life.
The Telstar 11N satellite operates in three Ku frequency bands. It is a three-axis stabilized
spacecraft based on Space System/Loral’s LS-1300 bus. The high-power bus is able to support
39 Ku-band transponders, with 100 watt Traveling Wave Tube Amplifiers (TWTAs) assigned to
transponders for the US beam, 125 watt TWTAs assigned to transponders within the Europe and
AOR beams, and 150 watt TWTAs assigned to transponders within the Europe, AOR and Africa
beams. The satellite design utilizes high efficiency solar cells and a unique heat-radiating design
to support the high power payload. The spacecraft physical design and layout optimize the EIRP
and G/T performance of the satellite.
The spacecraft structure consists of a large, rectangular main body to internally house the
electronic equipment and externally support the satellite communication antennas, solar arrays
and thrusters. Telstar 11N employs advanced shaped-reflector technology to accurately define
the EIRP and G/T performance contours. This antenna technology allows for optimum
distribution of the satellite power on the earth’s surface plus excellent cross-polarization
performance.
The multiple coverage regions may be interconnected by reconfigurable ground commands.
Eighteen transponders have switchable uplinks and coverage areas, while 21 transponders have
dedicated uplinks and coverage areas. The AOR uplink beam is limited to US downlink only, and
the AOR downlink beam is limited to US uplink only.
The transponders may also provide Automatic Level Control (ALC). ALC allows the
transponder downlink to remain at a fixed operating point during uplink fades. The operating
point can be set at levels between transponder saturation and 5 dB input back-off, offering
significant benefit to all forms of satellite traffic, analog and digital.
There are linearizers on all transponders. The linearizers add gain expansion and phase advance
in order to offset the gain compression and phase lag of the TWTAs.
The Telesat Satellite Management and Control Center, has the most advanced satellite control
earth station equipment available. Telesat continues to lead the industry in providing exceptional
high quality service to its customers.
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Technical Summary
Launch Information
Orbital Location: 37.55 W.L.
Launch Date: 4th
Qtr 2008
Launch Vehicle: Land Launch (Sea Launch rocket from Baikonur)
Life Expectancy: 15 years (operational mission design life)
Transponder Information
Ku-Band Coverage Bandwidth Power
US, Caribbean 54 MHz 100 Watt TWTA
Europe 54 MHz 125/150 Watt TWTA
Africa 54 MHz 150 Watt TWTA
Atlantic Ocean 27 MHz 125/150 Watt TWTA
Station Keeping: 0.05
Pointing Accuracy: 0.13 for normal operations
Satellite Physical Design
Manufacturer: Space Systems/Loral
Spacecraft Bus Design: LS1300
Stabilization Mode: 3-axis stabilized
Structure Dimensions (Stowed): 19.5 x 10.3 x 9.7 ft.
Structure Dimensions (Deployed): 17.9 x 28.5 x 102 ft.
Solar Array Area: 642 ft2
Prime Power (Summer Sol./EOL): 9547 W
Batteries(Two): 24-cell, 80 Ahr, Li-Ion
Eclipse Capability: 100%
Total Mass at Launch: 4010 kg/8820 lbs.
Dry Mass: 1773 kg/3900 lbs.
Satellite Antennas
Ku-Band: US/Caribbean 1 Combined Transmit/Receive
Europe 1 Combined Transmit/Receive
Africa 1 Combined Transmit/Receive
Atlantic Ocean 1 Combined Transmit/Receive
TT&C 4 Telemetry
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Redundancy HPAs LNAs D/Cs
Transponders: 49-for-39 10-for-7 25-for-15
Beacon: 2-for-1
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N Fully Deployed
Figure 1
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N Antenna Configuration
Figure 2
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Transponder Frequency Plan
Figure 3
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Technical Description
Ku-Band Payload Summary
The Telstar 11N Ku-band communications payload is a mix of 100W, 125W, and 150W TWTAs
operating at 0 dB or 3 dB Output Back Off (OBO) over 39 active transponders operating in
multiple frequency bands. The payload frequency range is 10.95 to 12.75 GHz (downlink), 13.75
to 14.50 GHz (uplink). The useable bandwidth of the transponders for Europe, USA, and Africa
downlink coverage is 54 MHz. The usable bandwidth of the transponders for Atlantic Ocean
downlink coverage is 27 MHz. Transponder center frequencies are shown in the Telstar 11N
Transponder Frequency Plan.
Four beacon frequencies are shown in the frequency plan. The Ku-band transponders can be
individually configured to operate in either the Fixed Gain Mode or the Automatic Level Control
Mode.
Connectivity
The satellite has the ability to connect various uplink combinations to some of the downlink
beams. Other uplink to downlink beam configurations are fixed. The current transponder
connectivity is shown in the frequency plan (Figure 3).
EIRP
The following table summarizes End-of-Life (EOL) at Edge-of-Coverage (EOC) minimum
transponder EIRP performance for the Telstar 11N Ku-band transponders. For more detailed
information, please refer to the EIRP patterns.
Coverage Area Ku-Band Coverage Area Ku-Band
(dBW) (dBW)
Europe 47.0 CAFTA 49.0
West Europe 50.0 Puerto Rico 49.0
AOR 44.0 USA 46.0
West Africa 49.0 Atlantic Off-Shore 45.5
South Africa 48.0 Gulf of Mexico 47.0
Sub-Sahara 46.0 Nova Scotia 43.0
G/T
The following table summarizes minimum G/T values at EOL for the Telstar 11N Ku-band
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
transponders at EOC. For more detailed information, please refer to the G/T patterns.
Coverage Area Ku-Band Coverage Area Ku-Band
(dB/K) (dB/K)
Europe 1.0 CAFTA 2.0
West Europe 3.0 Puerto Rico 2.0
AOR -2.3 USA -1.0
West Africa 1.0 Atlantic Off-Shore -1.0
South Africa 0.0 Gulf of Mexico 1.0
Sub-Sahara -2.0 Nova Scotia -3.0
Saturation Flux Density
The following table summarizes the minimum Saturation Flux Density (SFD) values at EOL for
the Telstar 11N transponders at EOC, and are based on 0 dB attenuation @ Fixed Gain Mode.
Coverage Area Ku-Band Coverage Area Ku-Band
(dBW/m2) (dBW/m2)
Europe -95.0 CAFTA -97.0
West Europe -97.0 Puerto Rico -97.0
AOR -95.0 USA -94.0
West Africa -96.0 Atlantic Off-Shore -94.0
South Africa -95.0 Gulf of Mexico -96.0
Sub-Sahara -93.0 Nova Scotia -92.0
Fixed Gain Mode
Telstar 11N Ku-band transponders can be individually configured to operate in either the Fixed
Gain Mode or the Automatic Level Control mode. The transponders consist of a Linearized
Channel Amplifier (LCAMP), electronic power conditioner, and Traveling Wave Tube.
In the Fixed Gain Mode (FGM), the transponder’s LCAMP commandable attenuator is used to
control channel gain and, hence, set Saturation Flux Density (SFD). The FGM has a 31 dB
commandable gain range in 1.0-dB steps. The SFD is adjustable separately for each transponder.
Automatic Level Control
The Automatic Level Control (ALC) mode provides automatic onboard compensation for uplink
rain fade. The ALC circuit maintains the output at a constant level in the event of an uplink
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
signal fade. In the ALC mode, a commandable TWTA drive adjust attenuator following the ALC
circuit is provided to adjust the TWTA drive level by a total of 15.5 dB in nominal 0.5 dB steps.
The ALC has up to 21 dB of dynamic range to automatically compensate for uplink fades, while
maintaining the TWTA drive level at the input backoff level specified.
The ALC mode operates according to the average power in the transponder (signals plus noise)
and has a nominal time constant of 50 ms and a minimum constant of 10 ms.
Polarization
All four Ku-band transmit and receive antennas utilize both horizontal and vertical linear
polarization.
Cross-Polarization Isolation
The Ku-band cross-polarization receive isolation is 31 dB minimum.
Beacons
The satellite provides up to four beacons - two beacons radiating in the vertical downlink
polarization and two beacons radiating in the horizontal downlink polarization. The beacon
subsystem consists of four transmitters, with the ability to utilize two dedicated TWTAs to
provide High-Power Wide-Angle telemetry transmission when necessary.
The Telstar 11N Ku-band beacon polarizations and frequencies are shown below:
Downlink Polarization Beacon Frequency
Vertical 11199.25 MHz
Vertical 11699.50 MHz
Horizontal 11198.25 MHz
Horizontal 11698.50 MHz
A minimum of two of the four beacons will be active during “on-station” operations. These
beacons can be used for earth station tracking and earth station antenna polarization alignment.
The beacon stability is +/- 10 ppm (EOL) with an EIRP of >9 dBW at EOC.
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Spacecraft Redundancy
The Telstar 11N satellite design utilizes a variety of redundancy techniques. These techniques
include automatic on-line redundancy and manually switched components. Critical spacecraft
components are redundant as shown in the following table:
Spacecraft Component Redundancy
Ku-band TWTAs: 49-for-39
Ku-band LNAs: 10-for-7
Ku-band D/Cs: 25-for-15
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N Europe Transmit EIRP (dBW)
Figure 4
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N Europe Receive G/T (dB/K)
Figure 5
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N Africa Transmit EIRP (dBW)
Figure 6
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N Africa Receive G/T (dB/K)
Figure 7
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N US Transmit EIRP (dBW)
Figure 8
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N US Receive G/T (dB/K)
Figure 9
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N AOR Transmit EIRP (dBW)
Figure 10
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Telstar 11N AOR Receive G/T (dB/K)
Figure 11
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Appendix A
Supplemental Specifications
Group Delay
The following table shows a typical transponder’s group delay at center frequency offsets:
Typical Group Delay 27 MHz
Frequency, offset from center (MHz) +/-6 +/-8 +/-10 +/-12 +/-13.5
Ku-Band Transponders (ns) 10.5 14.5 23.0 50.0 100.0
Typical Group Delay 54 MHz
Frequency, offset from center (MHz) +/-12 +/-16 +/-20 +/-24 +/-27
Ku-Band Transponders (ns) 8.0 11.0 18.0 31.0 60.0
Amplitude Linearity
The level of the third order intermodulation products resulting from two equal carriers in the
same transponder shall not exceed the levels given below, relative to either output carrier.
Input level of each carrier below
single carrier saturation (dB)
Level of third order product at
output (dBc)
3 -9.5
6 -17
9 -22
13 -27
20 -33
Noise Power Ratio (NPR)
The NPR is defined as the ratio of the power density of the noise to the power density in the
center slot at the output of the transponder. The following table shows typical transponder NPR
performance at different noise loading levels:
NPR Performance
Output Back-off (dB) -2.5 -3.0 -3.5
NPR (dB) -13.5 -15.0 -16.5
Phase Linearity
The total phase difference, measured at the transponder output, between a carrier at saturation
compared with a 20 dB input backoff is less than 20 degrees.
Frequency Translation Stability
For Ku-band transponders, the daily stability of the translation frequency is 0.5 ppm. The long-
term stability over the mission life is 2.0 ppm.
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.
Spurious Outputs
The total power resulting from the sum of all spurious signals measured at the input to the
transmit antenna will not exceed -30 dBW in any 1 MHz band in the frequency range of 10.95 to
12.75 GHz.
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Telesat Telstar 11N Technical Manual
________________________________________________________________________
ESD-002 Rev 1.2 07-Apr-09
This document does not contain export controlled technical data as defined by Directorate for Freedom of Information and Security
Review (DFOISR).
This document shall not be disclosed, disseminated or reproduced, in whole or in part, without the express prior written approval of
Telesat.