Science & Tech

(USV) DriX

DriX
Ocean Exploration Trust

Uncrewed surface vehicle (USV) DriX provides high quality data acquisition in both shallow and deep waters. Designed by iXblue, the hybrid remote-controlled and autonomous DriX is operated by the Center for Coastal and Ocean Mapping/Joint Hydrographic Center (CCOM/JHC) at the University of New Hampshire. As one of the partners of the Ocean Exploration Cooperative Institute, UNH with plans to deploy DriX during upcoming E/V Nautilus expeditions to the Papahānaumokuākea Marine National Monument and the Pacific Remote Islands Marine National Monument.

Whether operating as a seafloor mapping platform or as a communication relay for supervising other underwater vehicles, DriX helps move ocean exploration towards multi-platform parallel operations, thereby greatly expanding how much can be accomplished in a single mission. With its hull made of carbon Kevlar-reinforced composite material, DriX is lightweight and can travel at high speeds without compromising stability. DriX can operate in coastal shallow waters as shallow as 4-meter depths as well as over deeper offshore due to its AUV tracking and communication capabilities via Sonardyne’s USBL and acoustic modem systems.

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    DriX At-A-Glance

    General

    • 7.7 m x0.8 m
    • 2 m
    • 4.5 tonnes (w/ UDS) 1.38 tonnes vehicle alone
      • 4 days at 7 knots
      • Maximum speed 13 knots
      • Single fixed pitch propellor with a 38 HP diesel engine
      • Max speed
    • Launched and recovered in Universal Deployment System UDS which protects the hydrodynamic hull.
    • Automated Docking with LIDAR or “Moving Baseline RTK GPS” modes.

    Mapping Systems

    • EM2040 Multibeam sonar (200-400 kHz)
      • 5 - 500 meters water depth. This higher frequency sonar is ideal for shallow water with a smaller beam range compared with the Nautilusʻs EM302 multibeam 30kHz system.
    • EK-80 Single Beam Fisheries Echosounder with 7-degree, 200kHz (and optionally 70kHz) transducers.
      • This sonar helps reveal dynamics of the midwater including seeing species vertical migration through the water column and can guide midwater-specialist vehicle AUV Mesobot.

    Sensors:

    • iXblue PHINS INS
    • Septentrio GPS
    • Sonardyne HPT3000 USBL
    • Valeport SV Sensor in the gondola.
    • Valeport SWIFT CTD with custom CTD winch (to 300 m)
    • cameras, optical sensors, radars and LiDARs
      • 5 Color and 1 IR camera
      • Ouster LIDAR
      • Lowance Halo 20+ Marine radar
      • Class B AIS Transceiver

    Communication

    • Drix reports itʻs location back to Nautilus by any of several telemetry radio systems.
      • For hand-held remote control UHF radios within the DriX and joy-stick controller units make the link.
      • For mid-range (< 5km) and high-bandwidth communications Wifi makes the link. The bandwidth of this system varies with range to the DriX, reaching 300 Mbps at close ranges and just a few 10’s of kbps at the most distant ranges.
      • For long-range communications (10-20km) a pair of Kongsberg Marine Broadband Radios make the link. This link’s bandwidth is fixed to one of several operator-selected values, with a maximum of 15 Mbps which must be allocated between the two radios. Typically 85 or 80% of the link is reserved for data coming back from DriX to Nautilus, and the remainder is provided for command and control messages from Nautilus to DriX.
    • Communications to underwater vehicles is provided by an acoustic modem which is part and parcel of the Sonardyne Ultra-Short-Base-Line underwater positioning system. This system allows sending of short, fixed-length messages and small files over the acoustic link.