DART® Design Characteristics / Specifications
SUMMARY OF DART II PERFORMANCE CHARACTERISTICS / SPECIFICATIONS
| Mandatory Characteristic | Specification |
|---|---|
| Measurement sensitivity | Less than 1 millimeter in 6000 meters; 2 * 10-7 |
| Sampling interval, internal record | 15 seconds |
| Sampling interval, event reports | 15 and 60 seconds |
| Sampling interval, tidal reports | 15 minutes |
| Two-way end-to-end communications | On demand, tsunami warning center (TWC) trigger |
| Tsunami data report trigger | Automatically by tsunami detection algorithm |
| Data flow, BPR to TWC | Less than 3 minutes after triggered event |
| Desired Characteristic | Specification |
| Reliability and data return ratio | Greater than 80% |
| Maximum deployment depth | 6000 meters |
| Minimum deployment duration | 1 year |
| Operating Conditions | Beaufort 9 |
| Theoretical Battery Life, buoy | Greater than 2 years |
| Theoretical Battery Life, tsunameter | Greater than 4 years |
| Maximum status report interval | Less than 6 hours |
Iridium uses a Motorola 9522 L-band trans- ceiver from NAL Research at 2400 baud.
GPS is a Leadtek model 9546 receiverBuoy:
- Fiberglass over foam.
- Computer is 32-bit, 3.3 volt Motorola 68332
- System electronics use 2560 watt-hour D-cell battery pack.
Mooring is 19 mm 8-strandplaited nylon line with rated breaking strength of 7100 kg.
Acoustic modems on tsunameter and buoy:
- Benthos ATM-880 Telesonar with AT-421LF directional transducer.
- Powered by 1800 watt-hour batteries.
Tsunameter:
- Pressure sensor is a 0-10000 psi model 410K Digiquartz Paroscientific unit.
- Tilt sensor is Geometrics 900-45 to determine orientation.
- Uses Alkaline D-cell battery with 1560 watt-hour capacity.
- Uses same computer as buoy.
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