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Presentation on theme: " Digital IF for SATCOM Terminals Introduction A.J. Vigil, Ph.D. Senior Scientist, Systek Senior Systems Engineer Product Director, Satellite."— Presentation transcript:

1 Digital IF for SATCOM Terminals Introduction A.J. Vigil, Ph.D. Senior Scientist, Systek Senior Systems Engineer Product Director, Satellite Communications Systems (PD-SCS) (703) / DSN (312) February 04 Friday

2 2 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

3 3 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

4 4 Digital IF: Concept L-Band IFDigital IF WaveformAnalogDigitally Sampled CapacityBandwidthSampling Rate FidelityDynamic RangeSample Size FrequencyWaveform Center FrequencyCenter Frequency Tag PowerWaveform PowerPower Tag Transport Medium Coaxial Cable Analog Fiber Ethernet Twisted Pair Ethernet Digital Fiber ModemMixed-SignalPure DSP Engine SwitchAnalogEthernet Combine / DivideAnalogDigital IFLAnalog FiberDigital Fiber ConversionL-Band to RFDigital to L-Band or RF AcronymIntermediate Frequency Intermediate Format

5 5 Digital IF: Feasibility L-Band IFDigital 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 SwitchesL-Band Matrix Switch COTS Ethernet Switch, 288x Gig Ethernet Capable Standards & Precedents MIL-STD NATO STANAG 4486 Cellular Base Stations WGS Channelizer ANSI/VITA (SIGINT) Technology Growth Linear Exponential - think Moores Law Feasible now Strong precedents Ideal for sustained growth

6 6 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 LevelDescription 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 LevelDescription 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.

7 7 traffic L/-Band RFDigital IF HPA LNA L-Band Switch Ethernet Switch BUC BDC IFL Dig / L Dig IF modems IFL L-Band modem Combiner / Divider L-Band modem HPA LNA BUC BDC IFL HPA LNA BUC BDC Dig / L 192 oooooo Dig IF modems oooooo Dig / L oooooo oooooo 24 HPA LNA Dig / RF HPA LNA IFL = Inter-Facility Link oooooo oooooo oooooo Digital IF: Enterprise Terminal Architecture

8 8 Digital IF: Enterprise Terminal Cost-Benefit modems through block conversionL-Band IFDigital 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 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

9 9 traffic L/-Band RFDigital IF Dig IF modem bank HPA LNA BUC BDC Dig / L oooooo prototype equipment under development Digital IF: Mid-Size Terminal Architectures Dig IF modems Dig IF modems Dig IF modems HPA LNA BUC BDC Dig / L Dig IF modems medium sized terminal, modems daisy chained with fail-over redundancy HPA LNA Dig / RF HPA LNA

10 10 traffic L/-Band RFDigital IF HPA LNA Dig IF modems HPA LNA BUC BDC Dig / L Dig IF modem small terminal VSAT (Very Small Aperture Terminal) or COTM (Comm On The Move) Digital IF: Small Terminal Architectures HPA LNA Dig / RF HPA LNA

11 11 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

12 12 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

13 13 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

14 14 Digital IF: Progress & Activity Progress MILCOM 2009Concept Paper MILCOM 2010CONOPS Paper RDECOM CERDEC S&TCD FAST POTATO Participation Visibility & Interest, Govt & Industry PD-SCS POM wedge for FY 2013 Present Activity Website updates distribution list & e-newsletter Establishing partnerships IEEE Standards Association We welcome collaborators ! More Information sign up for updates

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