$7,650.00

The DVL A50 is the world’s smallest doppler velocity log. It provides accurate velocity measurements when it’s between 5 cm to 50 m from the seafloor and has a 300 meter depth rating. With ±1% long term accuracy, it is a capable tool for subsea navigation. Using the Water Linked DVL BlueOS Extension, it enables position holding and autonomous navigation capabilities in the BlueROV2 and other vehicles.

Requires an Ethernet Switch for use on the BlueROV2.

SKU: BR-101756
HS Code: 9014.80.5000

Product Description

The DVL A50 is a high performance DVL in an insanely small package that opens the door to advanced capabilities on your ROV or AUV like position holding and autonomous navigation. It comes with a pre-installed WetLink Penetrator, JST GH connectors for the Ethernet and serial ports, and spade connectors for power to make integration with the BlueROV2 and other vehicles as easy as possible.

The DVL A50 is supported in BlueOS through the Water Linked DVL extension, enabling ROV position holding and navigation to augment your piloting experience.

A doppler velocity what??

A doppler velocity logger, or DVL, measures speed relative to the seafloor by using the doppler effect. It has four acoustic transducers tilted at 15 degree angles that send and receive pulses to the seafloor.

When the vehicle is moving forward, the doppler effect causes the returned frequency to increase, and vice versa when in reverse. When measured, this effect provides an extremely precise velocity measurement relative to the seafloor.

That’s important because it enables accurate underwater positioning and measurement of small changes in position. Acoustic positioning systems like USBLs and SBLs exist, but only provide location within a few meters range – not enough to enable autonomous navigation. The DVL provides an extremely accurate velocity measurement which, when integrated over time, provides a highly accurate position estimate.

Please note that, by itself, the DVL provides relative position but to have an accurate global position, you still need a positioning system like a GPS or USBL, in addition to the DVL.

Turn on auto pilot, err, auto ROV pilot

A DVL on an ROV is the missing piece needed to enable many advanced behaviors.

The most fundamental of those is position holding, which uses the DVL to maintain a consistent position when the pilot is not providing any input. Those of you with aerial drones are used to this – take your hands off the stick and the drone holds a GPS location, even with some wind or current. It makes piloting easier and reduces the mental workload needed to complete a mission. You don’t need a GPS or USBL positioning system to benefit from position hold!

The DVL also enables features such as waypoint navigation, survey grid navigation, guided mode, and more. These features require a global positioning system, such as a GPS or USBL, or require you to manually set the starting point on a map.

As far as DVLs go, this one is revolutionary

The Water Linked DVL A50 is special as it marks a revolutionary advance in the affordability, size, and capability of DVL technology. It launched in 2020 and Water Linked has continued software development updates to continuously improve it even more.

The compact size of the DVL A50 is truly mind boggling and enables it to be used on small vehicles. You’ll barely even notice that it’s there!

The small size doesn’t mean there’s a compromise on performance. In fact, the A50 has some of the most impressive performance specs of any DVL on the market, including the best minimum range of any unit, at 5 cm. This is important for an ROV, which often works near the bottom or even touches the bottom, to make sure you don’t lose track of your position in the process.

An ease to integrate

The DVL A50 comes ready to integrate in your application, whether that’s on a BlueROV2 or something else. In addition to the pre-installed WetLink Penetrator, it has JST GH connectors for the Ethernet and serial port communication options. We recommend Ethernet when possible, as it allows you to view the Water Linked configuration interface in a web browser.

Spade terminals are installed on the power wires and it can be powered from 10-30V.

If you’re using BlueOS, one-click installation of the Water Linked DVL extension provides support for the hardware and enables position hold and advanced navigation features. If you’re using it in another application, you can use the Water Linked API or PD6 protocols to communicate with the DVL.

Upgradeable for the most precise applications

DVLs are export controlled items when they have an accuracy of better than 1.0%. To avoid the required license and controls, the standard DVL A50 has an accuracy of +/-1.01%. If you require higher accuracy, a software upgrade can improve accuracy to +/-0.1%, but also requires paperwork for the appropriate regulatory license. Please contact Water Linked if you’d like to upgrade your unit!

Product Description

The DVL A50 is a high performance DVL in an insanely small package that opens the door to advanced capabilities on your ROV or AUV like position holding and autonomous navigation. It comes with a pre-installed WetLink Penetrator, JST GH connectors for the Ethernet and serial ports, and spade connectors for power to make integration with the BlueROV2 and other vehicles as easy as possible.

The DVL A50 is supported in BlueOS through the Water Linked DVL extension, enabling ROV position holding and navigation to augment your piloting experience.

A doppler velocity what??

A doppler velocity logger, or DVL, measures speed relative to the seafloor by using the doppler effect. It has four acoustic transducers tilted at 15 degree angles that send and receive pulses to the seafloor.

When the vehicle is moving forward, the doppler effect causes the returned frequency to increase, and vice versa when in reverse. When measured, this effect provides an extremely precise velocity measurement relative to the seafloor.

That’s important because it enables accurate underwater positioning and measurement of small changes in position. Acoustic positioning systems like USBLs and SBLs exist, but only provide location within a few meters range – not enough to enable autonomous navigation. The DVL provides an extremely accurate velocity measurement which, when integrated over time, provides a highly accurate position estimate.

Please note that, by itself, the DVL provides relative position but to have an accurate global position, you still need a positioning system like a GPS or USBL, in addition to the DVL.

Turn on auto pilot, err, auto ROV pilot

A DVL on an ROV is the missing piece needed to enable many advanced behaviors.

The most fundamental of those is position holding, which uses the DVL to maintain a consistent position when the pilot is not providing any input. Those of you with aerial drones are used to this – take your hands off the stick and the drone holds a GPS location, even with some wind or current. It makes piloting easier and reduces the mental workload needed to complete a mission. You don’t need a GPS or USBL positioning system to benefit from position hold!

The DVL also enables features such as waypoint navigation, survey grid navigation, guided mode, and more. These features require a global positioning system, such as a GPS or USBL, or require you to manually set the starting point on a map.

As far as DVLs go, this one is revolutionary

The Water Linked DVL A50 is special as it marks a revolutionary advance in the affordability, size, and capability of DVL technology. It launched in 2020 and Water Linked has continued software development updates to continuously improve it even more.

The compact size of the DVL A50 is truly mind boggling and enables it to be used on small vehicles. You’ll barely even notice that it’s there!

The small size doesn’t mean there’s a compromise on performance. In fact, the A50 has some of the most impressive performance specs of any DVL on the market, including the best minimum range of any unit, at 5 cm. This is important for an ROV, which often works near the bottom or even touches the bottom, to make sure you don’t lose track of your position in the process.

An ease to integrate

The DVL A50 comes ready to integrate in your application, whether that’s on a BlueROV2 or something else. In addition to the pre-installed WetLink Penetrator, it has JST GH connectors for the Ethernet and serial port communication options. We recommend Ethernet when possible, as it allows you to view the Water Linked configuration interface in a web browser.

Spade terminals are installed on the power wires and it can be powered from 10-30V.

If you’re using BlueOS, one-click installation of the Water Linked DVL extension provides support for the hardware and enables position hold and advanced navigation features. If you’re using it in another application, you can use the Water Linked API or PD6 protocols to communicate with the DVL.

Upgradeable for the most precise applications

DVLs are export controlled items when they have an accuracy of better than 1.0%. To avoid the required license and controls, the standard DVL A50 has an accuracy of +/-1.01%. If you require higher accuracy, a software upgrade can improve accuracy to +/-0.1%, but also requires paperwork for the appropriate regulatory license. Please contact Water Linked if you’d like to upgrade your unit!

  • 1 x DVL A50 (standard performance) with pre-installed WetLink Penetrator, JST GH connectors, and spade connectors
  • 1 x M10 Penetrator nut
  • 1 x Penetrator O-ring
  • 1 x RJ45 to JST GH adapter

Specifications

ParameterValue
Electrical
Supply Voltage10–30 V
Average Power Consumption4 W
Power-on Current Surge35 W
Acoustic
Transducer Frequency1 MHz
Transducer Setup4-beam convex Janus array
Transducer Beam Angle22.5°
Ping Rate4–26 Hz (adaptive to altitude)
Sensor AssistIntegrated AHRS/IMU (Yost Labs TSS-NANO)
Min Altitude5 cm
Max Altitude50 m (altitude > 35 meters is dependent
on seabed conditions, salinity levels etc.)
Max Velocity3.75 m/s
Velocity Resolution0.1 mm/s
Long Term Accuracy±1.01 %
Communication
InterfacesEthernet
Serial UART (115200 baud, 3.3 V)
Preconfigured IP Address192.168.2.95
ProtocolWater Linked API and PD6
Cable
Cable Length950 mm External
350 mm Internal (data)
155 mm Internal (power)
Connector Type
Ethernet4 position JST GH
UART6 position JST GH
PowerSpade #6/M3 stud
Connector Pinouts
Ethernet1 - White/orange
2 - White/green
3 - Green
4 - Orange
TX+
RX+
RX-
TX-
UART1 -
2 -
3 - White/brown
4 - Brown
5 -
6 -
empty
empty
TX (out)
RX (in)
empty
empty
Power1 - Red
2 - Black
Vin
Ground
WetLink Penetrator SizeWLP-M10-7.5MM-HC
Penetrator O-ringAS568-013 Buna-N 70A
Physical
Depth Rating300 m
Device Diameter66 mm
Device Height25 mm
Weight in Air170 g
Weight in Water105 g
MaterialsPEEK
316 Stainless steel
Operating Temperature-5–60 °C
DVL Mounting Screw SizeM3x0.5 x 5 mm
Mounting Bracket Screw SizeM5x0.8 x 16 mm
Compliance
CEYes
RoHSYes
All DVL-A50 specifications are available on the WaterLinked site

3D Models

DVL-A50_BR-101756 (.zip)

Documents

DVL-A50 Datasheet

Revision History

28 June 2023

  • BR-101756 - Initial Release
Integrating the DVL A50 on the BlueROV2
Learn how to integrate the Water Linked DVL A50 on the BlueROV2!

Water Linked Documentation

DVL A50 User Guide

LED Indicator

  • No green light: Power is off.
  • Flashing green light (slow): DVL looking for bottom lock.
  • Fixed green light: DVL has bottom lock. The LED is mostly on and blinks quickly to show we are alive.

Community

Blue Robotics Forum – Water Linked Acoustic Products

Water Linked Forum – Acoustic Communication