Doppler Velocity Log (DVL-75)

$2,299.00$3,641.00

The DVL 75 is designed for low-cost, medium accuracy measurement of the velocity of an ROV. The system provides velocity outputs relative to the world frame of reference and can estimate positions using dead reckoning.

SKU: CERULEAN_DVL_75 Category:

Description

This system is designed and priced for use by people who need to know generally where their ROV is located or want to hold a position in the face of currents or tether pull.

A baseline system consists of an electronics stack and a sensor head containing piezoelectric elements and an inertial measurement unit (IMU). An upgraded IMU version of the head is also available, which has similar positioning performance but reduced calibration requirements.

The electronics can be packaged in the user’s existing or new enclosure, or an optional Cerulean DVL enclosure can be used.

An optional GPS sensor is available, which can be used to easily initialize an ROV’s position with respect to the standard latitude-longitude world coordinate system. If the optional GPS is not used, the user can provide initialization coordinates from their own GPS or other reference, or simply use the DVL’s dead reckoning outputs relative to an arbitrary coordinate system.

Additional information

Contents

1x Electronics Stack 1x Sensor Head 1x Data Cable (Serial or Ethernet) 1x Postcard with Link and QR code to on-line documentation Includes DVL Baseline System Adds 1x Upgraded IMU Sensor Head (Removes baseline sensor head) Includes DVL Baseline System Adds 1x 300m Electronics Enclosure Includes DVL with Upgraded IMU Sensor Head Adds 1x 300m Electronics Enclosure Includes DVL with Upgraded IMU Sensor Head Adds 1x 300m Electronics Enclosure Adds 1x GPS Module Includes DVL Electronics and sensor head mounted on a 300m Electronics Enclosure Adds 1x GPS Module Optional Includes DVL Electronics and upgrade sensor head mounted on a 300m Electronics Enclosure Adds 1x GPS Module Optional Includes DVL Electronics, upgrade sensor head and GPS mounted on a 300m Electronics Enclosure

Technical Details

Maximum Depth Rating, Sensor Head 300m Volume, Sensor Head 100 ml Mass, Sensor Head 130 gm Volume, Optional Enclosure 430 ml Mass, Electronics Stack 115 gm Mass, Optional Enclosure with Electronics Stack 665m Maximum Operating Height (Altitude)* 40m Minimum Operating Height 30 cm Maximum Operating Speed 8 knots Dead Reckoning Circular Error Probable (CEP) (CEP = median expected error) 5% of distance traveled Angular Operating Envelope, Degrees off vertical 0 to 20° Ping Frequency 675 kHz Ping Repetion Rate 5 – 20 Hz V-in Power Min and Max 12V to 28V DC V-in Power Average (power averaged over 1 second) 12V to 24V DC, 8 watts average V-in Current, Peak (largest current spike during operation irrespective of voltage) 1.2 Amperes Serial Comms Voltage Levels 3.3V TTL or 5V TTL, auto sense Serial Parameters, Default 115200,8,N,1 Ethernet Support 10/100 Mbps *Achieved maximum height is dependent on several variables, including tilt of the sensor head, flatness of the bottom, hardness of the bottom, vegetation cover on the bottom, and salinity. On a hard-bottom body of water such as Lake Superior, we regularly achieve 40+ meters. On a muck-bottom lake such as Lake Minnetonka, we sometimes struggle to get 20 meters. Hard-packed sand bottoms tend to be somewhere in between those extremes.