Telstar 11N Technical Manual

Transcription

Telesat Telstar 11N Technical Manual
________________________________________________________________________
Telesat
Telstar 11N
Technical Manual
2008 Edition
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
ESD-002
Rev 1.2 07-Apr-09
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
ESD-002
Rev 1.2 07-Apr-09
of Telesat.
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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
ESD-002
Rev 1.2 07-Apr-09
of Telesat.
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Introduction
Telstar 11N, stationed at the 37.55 degrees West Longitude, expands the scope of Telesat Kuband 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.
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
________________________________________________________________________
Technical Summary
Launch Information
Orbital Location:
Launch Date:
Launch Vehicle:
Life Expectancy:
37.55 W.L.
4th Qtr 2008
Land Launch (Sea Launch rocket from Baikonur)
15 years (operational mission design life)
Transponder Information
Ku-Band Coverage
US, Caribbean
Europe
Africa
Atlantic Ocean
Bandwidth
54 MHz
54 MHz
54 MHz
27 MHz
Power
100 Watt TWTA
125/150 Watt TWTA
150 Watt TWTA
125/150 Watt TWTA
Station Keeping:
0.05
Pointing Accuracy:
0.13 for normal operations
Satellite Physical Design
Manufacturer:
Spacecraft Bus Design:
Stabilization Mode:
Structure Dimensions (Stowed):
Structure Dimensions (Deployed):
Solar Array Area:
Prime Power (Summer Sol./EOL):
Batteries(Two):
Eclipse Capability:
Total Mass at Launch:
Dry Mass:
Space Systems/Loral
LS1300
3-axis stabilized
19.5 x 10.3 x 9.7 ft.
17.9 x 28.5 x 102 ft.
642 ft2
9547 W
24-cell, 80 Ahr, Li-Ion
100%
4010 kg/8820 lbs.
1773 kg/3900 lbs.
Satellite Antennas
Ku-Band:
TT&C
US/Caribbean
Europe
Africa
Atlantic Ocean
1 Combined Transmit/Receive
4 Telemetry
ESD-002
Rev 1.2 07-Apr-09
Review (DFOISR).
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Redundancy
Transponders:
Beacon:
HPAs
LNAs
D/Cs
49-for-39
2-for-1
10-for-7
25-for-15
ESD-002
Rev 1.2 07-Apr-09
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Telstar 11N Fully Deployed
Figure 1
ESD-002
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Telstar 11N Antenna Configuration
Figure 2
ESD-002
Rev 1.2 07-Apr-09
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Transponder Frequency Plan
Figure 3
ESD-002
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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
Europe
West Europe
AOR
West Africa
South Africa
Sub-Sahara
Ku-Band
(dBW)
47.0
50.0
44.0
49.0
48.0
46.0
Coverage Area
CAFTA
Puerto Rico
USA
Atlantic Off-Shore
Gulf of Mexico
Nova Scotia
Ku-Band
(dBW)
49.0
49.0
46.0
45.5
47.0
43.0
G/T
The following table summarizes minimum G/T values at EOL for the Telstar 11N Ku-band
ESD-002
Rev 1.2 07-Apr-09
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transponders at EOC. For more detailed information, please refer to the G/T patterns.
Coverage Area
Europe
West Europe
AOR
West Africa
South Africa
Sub-Sahara
Ku-Band
(dB/K)
1.0
3.0
-2.3
1.0
0.0
-2.0
Coverage Area
CAFTA
Puerto Rico
USA
Atlantic Off-Shore
Gulf of Mexico
Nova Scotia
Ku-Band
(dB/K)
2.0
2.0
-1.0
-1.0
1.0
-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
Europe
West Europe
AOR
West Africa
South Africa
Sub-Sahara
Ku-Band
(dBW/m2)
-95.0
-97.0
-95.0
-96.0
-95.0
-93.0
Coverage Area
CAFTA
Puerto Rico
USA
Atlantic Off-Shore
Gulf of Mexico
Nova Scotia
Ku-Band
(dBW/m2)
-97.0
-97.0
-94.0
-94.0
-96.0
-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
ESD-002
Rev 1.2 07-Apr-09
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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
Vertical
Vertical
Horizontal
Horizontal
Beacon Frequency
11199.25 MHz
11699.50 MHz
11198.25 MHz
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.
ESD-002
Rev 1.2 07-Apr-09
Review (DFOISR).
Telesat.
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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
ESD-002
Rev 1.2 07-Apr-09
Review (DFOISR).
Telesat.
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Telstar 11N Europe Transmit EIRP (dBW)
Figure 4
ESD-002
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Telstar 11N Europe Receive G/T (dB/K)
Figure 5
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Telstar 11N Africa Transmit EIRP (dBW)
Figure 6
ESD-002
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Telstar 11N Africa Receive G/T (dB/K)
Figure 7
ESD-002
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Telstar 11N US Transmit EIRP (dBW)
Figure 8
ESD-002
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Telstar 11N US Receive G/T (dB/K)
Figure 9
ESD-002
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Telstar 11N AOR Transmit EIRP (dBW)
Figure 10
ESD-002
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Telstar 11N AOR Receive G/T (dB/K)
Figure 11
ESD-002
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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)
Ku-Band Transponders (ns)
Typical Group Delay 54 MHz
Frequency, offset from center (MHz)
Ku-Band Transponders (ns)
+/-6
10.5
+/-8
14.5
+/-10
23.0
+/-12
50.0
+/-13.5
100.0
+/-12
8.0
+/-16
11.0
+/-20
18.0
+/-24
31.0
+/-27
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)
3
6
9
13
20
Level of third order product at
output (dBc)
-9.5
-17
-22
-27
-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)
NPR (dB)
-2.5
-13.5
-3.0
-15.0
-3.5
-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 longterm stability over the mission life is 2.0 ppm.
ESD-002
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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.
ESD-002
Rev 1.2 07-Apr-09
Review (DFOISR).
Telesat.
________________________________________________________________________
ESD-002
Rev 1.2 07-Apr-09
Review (DFOISR).
Telesat.

Telstar 11N Technical Manual

Transcription

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