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Adding Resilience and Trust to GPS
- 1. Adding Resilience & Trust to GPS STL
- 2. • New signal available today • Broadcast on the Iridium sats • >30 dB stronger than GPS • Higher jamming and interference resistance • Operates indoors • Encrypted signal • Inherently anti-spoof • Subscription based service • Available for civilian use 2 STL – Satellite Time & Location Signal from The Ideal method for augmenting GPS to combat jamming and spoofing Copyright Orolia January 2017
- 3. Iridium STL 66 Iridium Satellites Global coverage 500 mile altitude 1000x stronger than GPS 24 GPS Satellites Global coverage 12,500 mile altitude 25x further away GPS from Copyright Orolia January 2017
- 4. Signal Comparison to GPS GPS SPS L1 STL Timing accuracy to UTC ~20 ns ~200 ns Positioning accuracy ~3 meters 30-50 meters Time ToFirst Fix -- Timing ~100 seconds ~few seconds Time ToFirst Fix -- Positioning ~100 seconds ~10 minutes Anti-spoofing No, only for military use Yes, encrypted signal Coverage Global Global Availability Outdoors With view of horizon to get accurate position with low DOP Limited view of sky lengthens convergence time Availability Indoors No Yes: 30 – 40 dB stronger 4 Copyright Orolia January 2017
- 5. • Re-purposed paging channels • 1620 MHz band, 25 KHz channel, QPSK • Spread Spectrum coded signal, 90 msec frame, ~1.4 sec burst on average • UTC synchronized timing • +/- 500 nsec spec • 100-200 nsec typical • Timing updates to a precision local oscillator for continuous time and frequency sourcing 5 Timing signal - How it works Copyright Orolia January 2017
- 6. Sub-microsecond Timing Worldwide 6 1 microsecond STL Standard Deviation: STL Max Excursion: 0.057 microseconds 0.332 microseconds Copyright Orolia January 2017
- 7. • Iridium: ~100 minute orbit • GPS: 12 hour orbit • Encrypted signal with subscriber keys • Positioning determination • Spot beam location (gross) • Range and Doppler updates • Convergence over minutes • Geo-location security 7 Low Earth Orbit (LEO) => Strong Signal with Spot Beams Copyright Orolia January 2017
- 8. 7 Global STL Coverage Copyright Orolia January 2017
- 9. • Time Sync • Augment GPS with an independent stronger signal • Anti spoof with subscriber authentication of encrypted signal • Deep Indoor Penetration • No outdoor installation or cabling required • 1000x stronger than GPS • Trusted Location • Security based on geo-location Benefits Copyright Orolia January 2017
- 10. Indoor Timing Solutions • Network time synchronization currently requires GPS • Data Centers • Payment Card Compliance • Secure Facilities • GPS roof antennas are a “nightmare” • Landlord permission / roof rights • Zoning restrictions in major cities • Building hazards (e.g. asbestos) • Outdoor equipment maintenance • Typical installation $10k + $1k/month • Same needs apply to data centers Building image from Greg Jacobs, Bicsi GPS 9 STL Copyright Orolia January 2017
- 11. Copyright Orolia January 2017 STL – adding Resilience & Trust to GPS GPS STL Atomic Holdover Clock A new service available from Spectracom