Syrinx – Doppler Velocity Log (DVL)

What you need to know

A perfect replacement for your 600 kHz DVL
High altitude, high resolution performance
4,000 metre titanium housing as standard
Replaceable transducers; water blocked
Easy to export
OEM options available

Syrinx is a 600 kHz Doppler Velocity Log (DVL) for surface and subsea vehicles and is the latest addition to Sonardyne’s acoustic product portfolio. Syrinx is capable of high altitude navigation comparable to a 300 kHz Doppler Velocity Log with the high resolution performance of a 1200 kHz DVL. The adaptive bottom lock system Syrinx operates has been demonstrated to provide consistency and reliability over challenging and changing topography. This results in a navigation tool ideal for use on ROVs and AUVs in any environment.

A highly capable and versatile Doppler Velocity Log

Syrinx can be used as a standalone DVL, as part of an integrated system, or perform both functions at once due to concurrent Ethernet and serial output capability at ping rates of up to 25 Hz. Its dual capability means that only one DVL/altitude sensor is required for both ROV control and Survey crews, saving on cost and payload weight whilst meeting the requirements of both users.

The unit runs an embedded DVL Manager web interface that allows the user to configure, operate and test the device while also providing data visualisation. Syrinx can be connected to and configured using a web browser, removing the need for configuration software*.

The hardware and interfacing has been designed to be easy to install, set up and use and can be fitted to existing DVL mounting brackets. With similar dimensions to existing DVLs, there should be no need for physical modifications to subsea vehicles in order to upgrade to a Syrinx Doppler Velocity Log . The industry standard PD4 and PD0 telegrams are also supported allowing for seamless integration to third party navigation systems.

When tightly integrated with Sonardyne’s SPRINT INS, unmatched DVL aided navigation can be achieved even in challenging conditions. Two way communications allows for enhanced performance through optimisation of data passed between the DVL and SPRINT INS to aid in velocity prediction and outlier rejection.

A head for heights

Syrinx excels at all altitudes thanks to its improved reliability adaptive bottom lock combined with low noise electronics and fully linear signal processing techniques. These techniques have been refined to avoid any loss in output measurements including when navigating over undulating and challenging terrain of any type. Unlike many DVLs, Syrinx’s signal processing technique can continue to output data at very high update rates when operating at very low altitudes (< 1m).

A 4,000 metre titanium version of the Syrinx DVL is available to meet the requirements of modern Work-Class ROVs. 3,000 metre and 6,000 metre models are also available. The transducers used in Syrinx have been designed, built and tested in house to provide maximum performance. Not only this, the design also enables each transducer to be individually replaced. Therefore should any operational damage occur, this feature reduces both repair time and costs. From April 2017 an internal bulkhead is fitted to protect the main chamber (containing the internal electronics) from water ingress should a transducer become badly damaged

Syrinx has been tested to the industry standards for subsea equipment, ensuring that Syrinx is certified and suitable for the intended working environments.

More about this product

Syrinx - Doppler Velocity Log Specifications

Feature	Type 8275
Operational Frequency	600 kHz
Bottom Velocity – Single Ping Precision Standard Deviation @ 1 m/s*	±0.22 cm/s
Long Term Accuracy	±0.12% ±0.1 cm/s
Minimum/Maximum Altitude	0.4/175 m
Velocity Range	>10 m/s
Velocity Resolution	0.01 cm/s
Data Output Rate	25 Hz max
Maximum Transmit Source Level (dB re 1 uPa @ 1 m)	217 dB
Water Reference Velocity	Accuracy Layer Size Minimum/Maximum Range	±0.2% ±0.1 cm/s Selectable 0.5 m/70 m
Sensors	Temperature Pitch/Roll (Optional) Pressure (Optional)	-5° to 40°C/s ±0.5° ±0.1% full scale
Configuration	Array	4-beam array @ 30° beam angles
Communication and Logging	Communications Trigger Inputs Internal Logging	Dual RS232, multi-port Ethernet (TCP and UDP) 3 V–12 V rising or falling edge configurable 32 GB internal memory
Output	Output Telegrams	Sonardyne proprietary, PD3, PD4, PD6, PD13 PD0, SDDBT Simultaneous telegram output
Power	Voltage Range (DC Input) Average Power (Typical)	24 V (±10%) 10 W
Environmental	Depth Rating Operating Temperature Storage Temperature	3000 m/4000 m/6000 m -5 to 55°C -20 to 55°C
Mechanical Construction	Aluminium (3000 m)/Titanium (4000 m, 6000 m)
Dimensions (Height x Max Diameter)	196 mm x 225 mm (4000 m version)
Weight in Air/Water	12.0 kg/4.0 kg (4000 m version)

Syrinx OEM Options

The Syrinx DVL OEM is a class leading Doppler Velocity Log that builds on Sonardyne’s existing product range of acoustic instrumentation by bringing to market a high integrity, high performance instrument. The OEM version contains the Core electronics for custom integration.

Syrinx can be used as a standalone navigation instrument or can be integrated into Sonardyne’s SPRINT system or other 3rd party navigation systems.
This new DVL OEM provides the best of both worlds in a single unit. With a large altitude range and high precision at all altitudes, this combines the best of 300 and 1200 kHz DVLs.

With multiple serial outputs and Ethernet connectivity the Syrinx DVL OEM allows users to simultaneously output data of different formats, so you can provide the ROV crew with one data format and your survey crew another. This reduces the requirement of more than one DVL on board the ROV, saving on weight and costs.

Syrinx Combined Unit - DVL with AHRS/ INS

Syrinx provides tight beam-level aiding to SPRINT INS that allows for unprecedented DVL positioning performance and can continue to operate even if one or two DVL beams are unavailable. Standalone 3rd generation SPRINT units are engineered to mechanically ‘mate’ with Syrinx DVL using matching endcap alignment dowels. This provides the performance and space benefits of pre-calibrated and repeatable inertial and DVL but either unit can be swapped out.

For the ultimate integration, SPRINT and Syrinx are also now available as a single combined unit. The result is one of the smallest inertial DVL instruments available on the market. Available with an optional internal intelligent pressure sensor it provides a single unit for almost any ROV and survey task. In the combined unit, each Syrinx transducer has a full depth rated water block to ensure protection of the high accuracy internal components. SPRINT-Nav as combined units does not require a re-export license, making the global use of the product far easier

FAQs

What are the maximum and minimum altitudes that Syrinx DVL will operate?

The maximum operating altitude is up to 140 m, depending on seabed composition, acoustic noise and sedimentation in the water column.

The minimum operating altitude is 0.5 m. Below this altitude the velocity errors begin to grow very large but velocity estimates can still be made to around 0.3 m.

Mounting the DVL as high as possible on the vehicle while maintaining line of the sight for all 4 beams allows for the best results in very low altitude scenarios.

What are the maximum and minimum velocities that Syrinx can detect?

Minimum velocity measurements are <1mm/s in X, Y and Z (or beam) velocities when using the Sonardyne proprietary telegram. This increases to 1 mm/s when using PD4/PD5 telegrams.

Maximum velocity measurement capability is 10 m/s.

What is the maximum rate that I can ping?

10 Hz or 10 pings per second, water depth allowing. In deeper water, ping rates may be reduced due to allow for acoustic propagation time.

Can I externally trigger Syrinx?

Yes. Syrinx can be triggered from a rising or falling edge. This can be configured either through the configuration software or via command line. The trigger needs to be 3-12 V and able to drive at least 5 mA.

How do I correct for speed of sound?

A command can be used to set the speed of sound within the DVL, which will then scale all measurements using this value. It is also possible for the DVL to output measurements using a fixed SV value, and the measurements can later be scaled in external navigation software.

What is the maximum seabed slope that I can still bottom track?

The maximum seabed slope on which bottom lock can be attained is highly dependent upon a number of different factors. Some examples include height difference between ranges (amplified difference if slope is steep and altitude on some beams is very low and others are high) and also backscatter properties based on incidence angle of the acoustic pulse on the sea floor.

An example statistic would be that at 10 m altitude, Syrinx will be able to track steep slopes of up to 75°. At very shallow altitude (1-2 m) the DVL would be able to track on a slope of 45°.

What interference might I get between Syrinx and the other acoustic equipment on my vehicle?

Acoustic interference will vary depending on the equipment that is fitted on the vehicle. Acoustic transmissions of similar frequencies can cause interference with the DVL operation. The best way to manage interference is to time pulses from interfering devices either synchronously or asynchronously. From experience it is recommended to trigger asynchronously to prevent devices from acoustically interfering with one another.

Manuals

To request a manual simply tick the box next to the manual you require and then press the Request Form button. You will then be able to request addition manuals for other products and your request will be emailed to our Customer Support Team who will reply to your enquiry. Alternatively please contact your local office who will be more than happy to help.

Syrinx DVL User Manual
UM-8275 - Issue A, Revision 3

Syrinx DVL Operation Quide
QSG-OG-8275 - Issue A, Revision 2

Request Manuals

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