www.dcats.info digital if for satcom terminals introduction a.j. vigil, ph.d. senior scientist,...
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Digital IF forSATCOM Terminals
Introduction
A.J. Vigil, Ph.D.Senior Scientist, Systek
Senior Systems Engineer Product Director, Satellite Communications Systems (PD-SCS)
(703) 806-8469 / DSN (312) [email protected]
2011 February 04 Friday
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Digital IF = Digital Intermediate Format Motivators Concept Feasibility Technical Readiness Level Enterprise Terminal Architecture Enterprise Terminal Cost-Benefit Mid-Size Terminal Architectures Small Terminal Architectures Why an Open Commercial Standard? Standardization Objectives Standards Process Progress & Activity
L-Band IF: Intermediate Frequency
Digital IF: Intermediate Format
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Introduction: Motivators Traffic Demand Link Count Transmission BW (BandWidth) Cost & Schedule
Development Production Deployment Operations
Floor Space SWAP (Size, Weight And Power)
VSAT (Very Small Aperture Terminals) COTM (Comm[unications] On The Move
Operational Complexity RF Performance New Capability Insertion
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Digital IF: Concept
L-Band IF Digital IF
Waveform Analog Digitally Sampled
Capacity Bandwidth Sampling Rate
Fidelity Dynamic Range Sample Size
Frequency Waveform Center Frequency Center Frequency Tag
Power Waveform Power Power Tag
Transport Medium Coaxial Cable Analog Fiber
Ethernet Twisted Pair Ethernet Digital Fiber
Modem Mixed-Signal Pure DSP Engine
Switch Analog Ethernet
Combine / Divide Analog Digital
IFL Analog Fiber Digital Fiber
Conversion L-Band to RF Digital to L-Band or RF
Acronym Intermediate Frequency Intermediate Format
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Digital IF: Feasibility L-Band IF Digital IF
DSP
125 MHz BW - lights up WGS transponders 90 dB Dynamic Range - cert-level performance
250 Msamples / sec x 16 bits / sample = 4 Gbits / sec << 10 Gig Ethernet
Switches L-Band Matrix Switch COTS Ethernet Switch, 288x288 - 10 Gig Ethernet Capable
Standards & Precedents
MIL-STD-188-164 NATO STANAG 4486
Cellular Base Stations WGS Channelizer ANSI/VITA 49.0-2009 (SIGINT)
Technology Growth Linear Exponential
- think “Moore’s Law”
Feasible now Strong precedents Ideal for sustained growth
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Digital IF: Technology Readiness Level CERDEC FAST Prototypes
Underlying Technology A/D, D/A, DSP, FFT, IP, Ethernet SNMPv1, SNMPv3, XML over IP, secure XML over IP
Technology Readiness Level Description
6. System/subsystem model or prototype demonstration in a relevant environment
Representative model or prototype system, which is well beyond the breadboard tested for TRL 5, is tested in a relevant environment. Represents a major step up in a technology's demonstrated readiness. Examples include testing a prototype in a high fidelity laboratory environment or in simulated operational environment.
Technology Readiness Level Description
8. Actual system completed and 'flight qualified' through test and demonstration
Technology has been proven to work in its final form and under expected conditions. In almost all cases, this TRL represents the end of true system development. Examples include developmental test and evaluation of the system in its intended weapon system to determine if it meets design specifications.
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traffic L/-Band RFDigital IF
HPALNA
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IFL
Dig / L
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L-Bandmodem
HPALNA
BUCBDCIFLIFL
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BUCBDC
Dig / L
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24 24
HPALNA
Dig / RF
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IFL = Inter-Facility Linkooo
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Digital IF: Enterprise Terminal Architecture
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Digital IF: Enterprise Terminal Cost-Benefit
modems through block conversion L-Band IF Digital IF
Modems, 192 each $1,920,000 $ 960,000
Switch Matrix Combiner/Divider, 192x24 $3,200,000
Ethernet Switch, 288 x 288, 2 each $ 200,000
Digital Combiner/Dividers, 24 each $ 240,000
Digital / L-band Converters, 24 each $ 600,000
Coax Cables, L-band Amps $ 50,000 $ 50,000
Totals, modems to RF $5,170,000 $2,050,000 Assumptions
Significant components only Modem cost is half Modem conversion cost is trivial Ethernet Switch – layer 1 – quoted Digital combiner/dividers $10k / aggregate Digital / L-band Converters $25k per pair All are conservative
Conclusions Save > $3M / terminal, incl modems Save > $1M / terminal sinking modem cost Conservative; yet to consider
IFLs Future insertions Performance burdens Facility burdens
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traffic L/-Band RFDigital IF
Dig IFmodem
bank
HPALNA
BUCBDC
Dig / L
ooo
prototype equipment under development
Digital IF: Mid-Size Terminal Architectures
Dig IFmodems
Dig IFmodems
Dig IFmodems
HPALNA
BUCBDC
Dig / L
Dig IFmodems
medium sized terminal, modems daisy chained with fail-over redundancy
HPALNA
Dig/ RF
HPALNA
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traffic L/-Band RFDigital IF
HPALNA
Dig IFmodems
HPALNA
BUCBDC
Dig / L
Dig IFmodem
small terminal
VSAT (Very Small Aperture Terminal) or COTM (Comm On The Move)
Digital IF: Small Terminal Architectures
HPALNA
Dig/ RF
HPALNA
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Why an Open Commercial Standard?
Plug & play interoperability Faster procurement path Less procurement expense Wider participation
Government Industry
Level playing field Standard comes first Full COTS basis Technology development is mature
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Digital IF: Standardization Objectives CONOPS
Reduced equipment complement Simplified installation Simplified test processes Reduced operational complexity Practical remote CMA
Economy Development costs & schedules Equipment / production costs Deployment costs & schedules Terminal footprint SWAP
Migration Minimal operational disruption, if any Retain legacy infrastructure value Arbitrarily scalable
Initial Capability Digital conversion to L-Band min 125 MHz contiguous BW 16 bit resolution Existing technology only;
Engineering, not development
Growth – Inherent Capability No limit to link count No limit to bandwidth Common to all terminal types & sizes
RF Performance Resolve IFL DR bottleneck Non-additive Tx noise floor Eliminate linear distortion effects Enable compensation for surviving
linear distortion
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Digital IF: Standards Process Why IEEE?
Credibility, experience, affordability, technical oversight, indemnification umbrella “Industry Connections”
“Incubation” stage - bring stakeholders together – with relevant IEEE support –under IEEE liability umbrella – up to 1 year
“Study Group” Up to 6 months, IEEE sponsor
Advanced Corp Membership Including “Government Agencies” $3,500 to $10,000 / year One membership, all standards Present members include
DISA, Boeing PAR & Working Group
Project Authorization Request Min 3 Advanced Corporate Members
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Digital IF: Progress & Activity Progress
MILCOM 2009 Concept Paper Website www.systek.com/Digital_IF/ MILCOM 2010 CONOPS Paper RDECOM CERDEC S&TCD FAST POTATO Participation Visibility & Interest, Govt & Industry PD-SCS POM wedge for FY 2013
Present Activity Website updates Email distribution list & e-newsletter Establishing partnerships IEEE Standards Association We welcome collaborators !
More Information www.systek.com/Digital_IF/ sign up for email updates