05/02/2013
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Iris Public Event
ANTARES SPACE SEGMENT DESIGN04 & 05 February 2013
University Of Salzburg Unipark, Salzburg
Giuseppe Grelli – Thales Alenia Space - Italia
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Contents
Design Drivers
Requirements, Performances & Characteristics HighlightsCoverages / Services Operating FrequenciesTraffic profilesEIRP and G/T
Main Architectural FeaturesBlock diagramMain functionalities
Technical Choices and Technological ChallengesAntenna farmDigital processingHigh Power Section
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Space Segment / Payload Design Drivers
Low cost user terminal
Traffic Demand and Traffic Flexibility
Availability Requirements
Drivers
High G/T on board Large antenna at L Band
High EIRP demand per carrierHPA & Ouput section sizing
Payload Architecture:Flexible Frequency Spectrum ManagementFlexible Power Management
Space segment constellation & deployement strategy
Combination of in orbit hot redundancy and on ground spare
Solutions
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ANTARES Space Segment Highlights
Infrastructure/Constellation to cope with availability requirements
1 satellite active + 1 hot redundant in orbitOn ground spare ready for lunch in 6 monthsSat in orbit lifetime: 15 years
Design Options to cope with SRD capacity requirement for operational system
Minumum traffic profileMaximum Traffic Profile
User link at L Band:Mobile Forward Link frequency band [1545 MHz ÷ 1555 MHz]Mobile Return Link frequency band [1646.5 MHz ÷ 1656.5 MHz]
Forward and return link carriersCarriers with bandwidth of 192 kHz (8 kHz guard band)
EIRP and G/T at L bandFWD single carrier/EIRP: 48.3 dBWRTN G/T requirement: 2.5 dB/K
Feeder link at Ku Band (Ka/X/C Band also possible)
Main Sat
Hot Redundant
Sat
User Link at L band Feeder
Link at Ku band
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Coverages / Services
“shall” TMA+ENRATS+AOC+Voice
“shall” ORPADS-C
“shall” ORPATS+AOC+Voice+ADS-C
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Payload Architecture and Main Features
Multiport Amplifier with parallesised TWTAs for
Dynamic Power Management according to traffic demand and traffic distiribution over
service area
Tx and Rx semi active large
antennas at L band for spot
beams coverage over ECAC
Global Coverage for
ADS-C services
Digital IF section for flexible frequency spectrum
management
Ku band Tx/Rx
antenna
L band User Link
Ku band feeder link
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EIRP & G/T Perfomance
Gain Over Temperature
(G/T)
Equivalent Isotropic Radiated Power
(EIRP)
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Technical Choices/Technological Challanges
Large L Band reflector (3.7 m trimmed reflector) driven by:L band G/T requirementInter-beam isolation for frequency re-use
IF Digital Transparent ProcessingFlexibility of Carrier Frequency allocationChannel filtering granularity
Multiport Amplifier (very high power handling to cope with traffic demand)
Butler Matrix High Power Amplifier: linearized TWTAs working at 3 dB OBO
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L-band Antenna Farm for User Link
Coverage: 5 spot covering the ECAC service area
Antenna system architecture: 2 offset reflector antennas 1Tx + 1Rxfed by a Multi-matrix distributed amplification architecture of reduced complexity:
12/16 radiating chains connected to 3/4 4x4 Butler Matrices in Txlow power BFN’s directly following LNA’s front-end in Rx
Antenna technology:lightweight composite reflector with truncated elliptical rim to reduce the size in stowed configurationhi-efficiency compact feed array
N
S
WEL-Band Tx Antenna
Trimmed reflector
L-Band Rx Antenna
Trimmed reflector
Tx feed array –apertures arranged in triangular
mesh
Rx feed array –apertures arranged in triangular
mesh.
P/F
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On Board Digital Processing
OBDP Processor functions implemented in ASIC/FPGA:
A/D conversion at I/F frequencycarrier filteringcarrier level controlcarrier frequency tuning carriers combination and D/A conversionLocal oscillator for the frequency conversion provided by dedicated circuitry (PLL and fractional)
Key featuresI/F Digital Transparent carrier processingCarrier bandwidth filtering configurabilityComplete flexibility for Carrier frequency allocation in a large spectrum
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Multi-matrix distributed amplification
Tx Antenna element beams footprint – 5 zones ECAC coverage:
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Tx Antenna 4x4 BTLM architecture and beams association(16 feed option)
Matrix D4x4
Flexible management of frequency specturm
Frequency reuse for spectral efficiency
Radiated Power dynamic management to cope with traffic variation and distribution (flexible power to beam allocation)
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Summary
DriversLow cost user terminalTraffic profilesTraffic & frequency flexibilityAvailability
Space Segment / Payload Design Options vs System Architecture Options
Design, architecture, analyses performances, budgets, for each of the optionsSPS Constellation/Infrastructure to meet avaibility rqmts
Choices/ChallangesHigh G/T: Large Antennas for User LinkEIRP/carrier and traffic need: High power handling & DC demandFlexible payload architecture and IF digital processing
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Thanks for Your attention!