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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.

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HS Code: 9015.80


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.

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Technical Details

Maximum Depth Rating, Sensor Head

300m

Volume, Sensor Head

100 ml

Mass, Sensor Head

130 gm

Volume, Optional Enclosure

480 ml

Mass, Electronics Stack

115 gm

Mass, Optional Enclosure with Electronics Stack

665 gm

Maximum Operating Height (Altitude)*

40 m

Minimum Operating Height

12 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

675kHz

Ping Repetition 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.

What comes in the Box

DVL Baseline System

1x Electronics Stack

1x Sensor Head

1x Data Cable (Serial or Ethernet)

  • 1x Postcard with Link and QR code to on-line documentation

DVL with Upgraded IMU Sensor Head

Includes DVL Baseline System

Adds 1x Upgraded IMU Sensor Head (Removes baseline sensor head)

DVL Baseline with 300m Electronics Enclosure

Includes DVL Baseline System

Adds 1x 300m Electronics Enclosure

DVL Baseline with Upgraded IMU sensor head and 300 Encl.

Includes DVL with Upgraded IMU Sensor Head

Adds 1x 300m Electronics Enclosure

DVL Baseline with Upgraded IMU sensor head, 300 Encl. and GPS module

Includes DVL with Upgraded IMU Sensor Head

Adds 1x 300m Electronics Enclosure

Adds 1x GPS Module

DVL Most-In-One

Includes DVL Electronics and sensor head mounted on a 300m Electronics Enclosure

Adds 1x GPS Module Optional

DVL Most-In-One + IMU upgrade

Includes DVL Electronics and upgrade sensor head mounted on a 300m Electronics Enclosure

Adds 1x GPS Module Optional

DVL All-In-One

Includes DVL Electronics, upgrade sensor head and GPS mounted on a 300m Electronics Enclosure

DVL-75 Packaging options

Software and Documentation

Download DVL-75 software and documentation here

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