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4 February 2022

Saildrone Explorer Unmanned Surface Vessel (USV), USA

The Saildrone USV can operate in maritime areas to perform data collection missions with an endurance of 365 days.
Saildrone Explorer is a new USV designed and developed by Saildrone. Credit: U.S. Army photo by Cpl. DeAndre Dawkins.
The Saildrone Explorer has an endurance of 365 days. Credit: U.S. Army photo by Cpl. DeAndre Dawkins.
The USV uses solar energy to power its sensor suite. Credit: MC2 Mark Thomas Mahmod, U.S. Navy.

Saildrone Explorer USV is a new unmanned surface vehicle (USV) designed and developed by Saildrone, a US-based manufacturer of unmanned systems, to collect high-quality data from the oceans autonomously that can be further processed and used for a variety of applications.

The Royal Jordanian Navy and the US Navy’s 5th Fleet established an unmanned task force for the integration of unmanned systems and artificial intelligence into its operations, in September 2021. The Jordanian naval base in Aqaba has been serving as a joint hub for operations of Saildrone USV in the Red Sea since December 2021.

The operational testing of the Saildrone Explorer USV was conducted during the Digital Horizon exercise held in the Gulf of Aqaba in December 2021.

Saildrone Explorer USV design and features

The Saildrone Explorer has a tall, hard wing, a longitudinal spar, and a vertical tail. The wing angle can be adjusted through a trim tab at the end of the tail to get adequate wind exposure and maintain the tall wing in position.

The rudder of the USV controls the direction of the hull, while the keel maintains the position of the USV.

The Saildrone Explorer USV has a hull length of 23ft (7m), a wing height of 15ft (5m), and a draft of 6ft (2m).

Navigation and autonomy

The Saildrone USV autonomously navigates through large areas of the oceans based on waypoint-to-waypoint navigation through wind and currents. It is constantly monitored by a pilot who can command and control the USV using satellite communications.

The USV features an automatic identification system (AIS) transceiver, radar reflector, navigation lights, high-visibility wing colours, and four onboard cameras to enhance safety during operations at sea.

Payload options available for Saildrone Explorer

The Saildrone Explorer can carry a range of sensors including Gill Windmaster 3D Ultrasonic anemometer for measuring wind speed and direction, Rotronic HC2 – S3 with radiation shield for measuring air temperature and humidity, Vaisala Barocap PTB210 pressure sensor for measuring barometric pressure, LI-COR LI-192SA underwater sensor for accurate measurement of photosynthetically active radiation, and Seabird SBE 37 sensor for recording salinity and temperature.

The Seabird SBE 37 ODO payload can be used for measuring dissolved oxygen, Wetlabs ECO-FL-S G4 fluorometer for Chlorophyll-a, Heitronics CT 15.10 infrared pyrometer for skin temperature, a dual global positioning system (GPS)-aided inertial measurement unit (IMU) for measuring wave height and period, and National Oceanic and Atmospheric Administration’s (NOAA) Pacific Marine Environmental Laboratory (PMEL) autonomous surface vehicle CO2 (ASVCO2) to measure carbon.

The USV can be fitted with a smart camera array, which includes 360° high-resolution optical cameras with ML target detection for smart imaging. In addition, the sensor suite includes options such as Teledyne RDI Workhorse acoustic Doppler current profiler (ADCP) for measuring ocean currents, and Simrad WBT Mini (EK80) echo sounder, as well as Airmar DT800 (shallow single-beam) thru-hull sensor, and Teledyne Echotrac E20 (deep single-beam) echosounder for bathymetric data collection.

Propulsion and performance of Saildrone Explorer USV

The Saildrone Explorer is equipped with systems that harness solar and wind energy for operation. The wind power from thrust generated by wind passing over the wing is used for the propulsion of the platform, while the solar power from panels installed on the wing and hull is used to run the meteorological and oceanographic sensors and electronic systems aboard the vessel.

The USV can sail at an average speed of 3kt (5.55km/h) and conduct long-endurance missions to collect ocean and climate data over 12 months in open ocean conditions. The usage of sustainable energy reduces the carbon footprint of the platform.

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