This page dedicated to resolving the design goals for this project. These will evolve as the design itself progresses.
Performance Envelope Goals:
- Depth: To 130 m (425 ft) in salt water. While this is within the open-ocean photic zone (http://en.wikipedia.org/wiki/Photic_zone), it is below the photic zone in the coastal and inland water bodies targeted in this design. It also allows for off-the-shelf components rated for 200 psi pressure.
- Range & endurance at 0.5 m/s (1 knot/1.125 mph): 43.2km (26.8 miles) over 30 hours at 80% duty cycle. This would allow an operator with two vehicles to launch and recover once per day and achieving full time coverage.
- Endurance keeping depth (not making way): 5 days. This mode is envisioned to be used if the vehicle can not be recovered on a given day, and must kept off the surface for one more day with the 20% remaining battery capacity.
- Operational environments: fresh water, sea water, super-saline lakes & lagoons.
- Parts cost: less than $1000
- Additional scientific sensor part costs: less than $250 each
Operational & Maintenance Goals
- Air weight: less than 14 kg (31 lb). This is a common definition of “human portable”.
- Time to complete battery re-charge: 4 hours or less. This would allow the system to be recovered in the morning, recharged in the afternoon, and stored safely overnight.
- Support 3G, and 4G wireless communications at the surface
- Be able to operate with only Wifi (IEEE 802.11n) connectivity in a limited area
- Global Positioning Service (GPS) on the surface
- AHRS (tilt/roll+compass)
- Height above the sea/lake/river bed
- Optical Backcatter/turbidity