DART® Design Characterstics / Specifications

SUMMARY OF DART II PERFORMANCE CHARACTERISTICS / SPECIFICATIONS

Mandatory Characteristic Specification
Measurement sensitivityLess than 1 millimeter in 6000 meters; 2 * 10-7
Sampling interval, internal record15 seconds
Sampling interval, event reports15 and 60 seconds
Sampling interval, tidal reports15 minutes
Two-way end-to-end communicationsOn demand, tsunami warning center (TWC) trigger
Tsunami data report triggerAutomatically by tsunami detection algorithm
Data flow, BPR to TWCLess than 3 minutes after triggered event
Desired Characteristic Specification
Reliability and data return ratioGreater than 80%
Maximum deployment depth6000 meters
Minimum deployment duration1 year
Operating ConditionsBeaufort 9
Theoretical Battery Life, buoyGreater than 2 years
Theoretical Battery Life, tsunameterGreater than 4 years
Maximum status report intervalLess than 6 hours
DART® Mooring System

Iridium uses a Motorola 9522 L-band trans- ceiver from NAL Research at 2400 baud.

GPS is a Leadtek model 9546 receiver

Buoy:

Mooring is 19 mm 8-strandplaited nylon line with rated breaking strength of 7100 kg.

Acoustic modems on tsunameter and buoy:

Tsunameter: