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Seismic VSAT Wish List

Seismic VSAT Wish List. Complete freedom of station placement Robust outdoor equipment Solar panels, low power consumption Low cost Affordable capital cost minimum operating cost Excellent data quality Robust error correction high data bandwidth infrastructure unaffected by major events.

tatyana-neal
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Seismic VSAT Wish List

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  1. Seismic VSAT Wish List • Complete freedom of station placement • Robust outdoor equipment • Solar panels, low power consumption • Low cost • Affordable capital cost • minimum operating cost • Excellent data quality • Robust error correction • high data bandwidth • infrastructure unaffected by major events

  2. Network Cost Comparison LEO Satellite Telephone Telephone Cost Commercial VSAT Libra VSAT Radio Network 0.5 - 1 repeater/remote Year

  3. VSAT Cost Comparison Data Rate Commercial VSAT Libra VSAT SCADA Satellite Cost

  4. Libra # of Modulation Rate per # carriers # carriers Total Cost/Yr stations carrier inbound outbound bandwidth ________________________________________________________________________________________________________________________________________________ 16 QPSK 112 kbps/ 1 None 100kHz $7,500 100kHz 32 QPSK 112 kbps/ 2 None 200kHz $15,000 100kHz 64 QPSK 112 kbps/ 4 None 400kHz $30,000 100kHz 16 FSK 64kbps/ 2 1 480kHz $37,500 160kHz 32 FSK 64kbps/ 3 1 640kHz $52,500 160kHz 64 FSK 64kbps/ 6 1 1120kHz $90,000 160kHz Blue = Libra Red = competing VSAT

  5. Libra • First fully integrated satellite seismograph • Designed specifically for seismic data telemetry • Lowest possible operating cost • Competitive capital cost • Highest possible data quality and integrity

  6. Libra Factory Integration • Entirely designed, manufactured and tested by Nanometrics • Single contact for support • Guaranteed performance Noise counts Dynamic Range 1.9 131 dB 6 121 dB 10 116 dB 18 111 dB • Digitiser sensitivity is 1.9 microvolts/bit (default) • RS232 allows +/- 3 Volts noise

  7. Libra • Cost effective for small and large networks • Complete freedom in station placement • Operates from solar panels • Supports co-located sensors

  8. Libra • Continuous data, 3ch, 100sps • Error correction via data re-request • 132 dB dynamic range (shorted input) • +/- 5 microseconds timing accuracy • 2.3 hour data buffer • <30 watt power consumption

  9. Libra • QPSK modulation • 112Kbps per 100KHz carrier • Time domain multiple access (TDMA) • Central Hub uses TDMA slot • Dynamic bandwidth allocation

  10. Libra Satellite Seismograph Network

  11. Libra Remote Site Equipment

  12. Libra Remote Site Antenna

  13. Libra Remote Site Systems

  14. Libra Remote Site Equipment Installation

  15. Libra 3 channel seismic 24-bit Digitiser 3 channel seismic User state-of-health 3 fast, 3 slow 10-bit state-of-health Transparent Serial Ports User serial ports (2) UDP/IP TCP/IP User Ethernet port VSAT Transceiver GPS

  16. TDMA Sequence VSAT1 VSAT3 VSAT4 VSAT1 VSAT2 HUB • 112 Kbit total bandwidth • 100KHz carrier bandwidth • 16 remotes per 100KHz carrier • Central Hub allocated slot for control traffic

  17. Hybrid Libra Network

  18. Libra Sub-net 1 Carina Internet data distribution • Supports multiple Hubs • Password Required to receive data • Dynamic allocation of network control • Down stream distribution via Internet Sub-net 2

  19. Seismic Traffic Pattern • In-balanced traffic pattern • Ability to allocate bandwidth station-by-station • Multiple hubs sharing data • Error correction between multiple hubs and remotes • 100kHz space segment minimums >95% Inbound <5% Outbound

  20. Bandwidth vs. Space Segment Assuming 100kHz space segment

  21. Single Carrier per Channel (SCPC) 100kHz • Disadvantages • Inefficient use of space segment • High power consumption (100% Tx duty cycle) • One receiver for each remote • Fixed bandwidth per station • Complicated multiple Hub designs 22 kHz 22 kHz 22 kHz 22 kHz At 6.5 Kbps, theoretical total of 10 stations • Advantages • Smaller dish size • low latency

  22. Time Domain Multiple Access (TDMA) 112 Kbps Station 1 Station 2 Station 3 Station n Hub 1 At 6.5 Kbps, maximum of 16 stations and one hub • Advantages • Efficient use of space segment • Low power consumption (Tx. Duty cycled) • Variable bandwidth per station • Dynamic bandwidth allocation • Multiple hub support • Disadvantages • larger dish size • 4 to 16s latency

  23. Libra Peer Hubs

  24. Libra Data Distribution Feed

  25. Libra Data Distribution Feed • Distribution of event data or bulletins • Uses existing Libra hub systems • Broadcasts IP-based messages in TDMA timeslot • Low cost, approximately $US 4000 / remote

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