Iris Public Event ANTARES SPACE SEGMENT DESIGN Segment_G.Grelli.pdf · Iris Public Event ANTARES SPACE SEGMENT DESIGN ... 1 satellite active + 1 hot redundant in orbit ... Feeder

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

Il documento non deve essere riprodotto, modificato, adattato, pubblicato, tradotto in qualsiasi forma sostanziale, in tutto o in parte,né divulgato a terze parti senza il preventivo consenso scritto di Thales Alenia Space - © 2012, Thales Alenia Space

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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:

1

2

34

5

6

7

8

9

10

1112

13

14

15

16

6

11

13

162

5

1214

1

4

7

10

3

8

9

15

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!

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Iris Public Event ANTARES SPACE SEGMENT DESIGN Segment_G.Grelli.pdf · Iris Public Event ANTARES SPACE SEGMENT DESIGN ... 1 satellite active + 1 hot redundant in orbit ... Feeder