Sonardyne Syrinx DVL

Syrinx is a 600 kHz Doppler Velocity Log (DVL) for surface and subsea vehicles. It combines the high altitude, high resolution features of 300 kHz and 1200 kHz DVLs in a single, easy to install navigation instrument.


The adaptive bottom lock technology inside Syrinx provides consistency and reliability over challenging and changing topography and works at an altitude higher than 85% of the world’s subsea infrastructure. This reduces the amount of time a vehicle has to dive on free inertial.


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 outputs, capable of 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 vehicle payload space.

The unit runs an embedded DVL Manager using a web browser, eliminating the need to install dedicated PC software. This allows Syrinx to be configured and tested prior to deployment, and then during subsea operations, controlled and navigation data is easily visualised. The hardware and vehicle interfacing has been designed to be easy to install, set up and use and is compatible with DVL mounting arrangements from third parties. With similar dimensions to existing DVLs, there should be no need for modifications to subsea vehicles in order to upgrade to a Syrinx DVL. PD0, PD3, PD4, PD6, PD13 telegrams are supported for integration to third party navigation systems.

When tightly integrated with Sonardyne’s INS, SPRINT, unmatched DVL aided navigation can be achieved. This allows for enhanced performance through optimisation of beamlevel data passed between Syrinx and SPRINT to aid velocity prediction and outlier rejection, with positioning able to continue even if one or two DVL beams are unavailable.

Syrinx’s onboard processor is able to report high resolution water velocity layer data in fine detail. This makes it suitable for ADCP applications or AUVs measuring water flow to update their positioning algorithms.


In open water, Syrinx is able to give a robust velocity output in a stationary environment, even at low altitude, giving long term accuracy with low bias errors in the range of a few tens of micro-metres per second. In this mode, Syrinx measures the phase change between backscatter return from each pulse using a wideband correlation technique. Sound is reflected back from many scatterers located on the seabed within a small footprint. Navigation can continue uninterrupted through partial sector obstruction and large differences in path length on an irregular seabed. A robust, low-altitude mode makes navigating near structures more precise for suveys such as metrology.


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 help prevent loss in output measurements, including when navigating over challenging terrain of any type. Unlike many DVLs, Syrinx can continue to output data at very high update rates when operating at very low altitudes (<1metre).


A 4,000 metre rated titanium housing is supplied as standard to meet the requirements of modern Work-Class ROVs. Syrinx 6,000 metre models and OEM (no housing) versions are also available. Syrinx’s transducers have been designed, built and tested in-house to provide maximum performance, and can be individually replaced, reducing ownership costs and repair time. The entire array is water blocked meaning that should damage occur to the transducer array, the unit’s electronics are isolated from water ingress.

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.


For the ultimate integration, SPRINT and Syrinx are also now available as a single combined unit with integral pressure sensor. The result is one of the smallest inertial DVL instruments available on the market suitable for almost any ROV and survey task.


Syrinx is designed and manufactured entirely in the UK. This means it can be exported to countries within the European Union and selected others (including the USA) without the need for a specific export licence.

Syrinx DVL Operating Range

Technical information

Operating Frequency: 600 kHz
Long Term Accuracy: ±0.12% ±0.1 cm/s
Min/Max Altitude: 0.4 m / 175 m
Depth Rating: 3,000 m, 4,000 m or 6,000 m
Housing Material: Aluminium or Titanium
Communications: Concurrent RS232 and Ethernet
Data Output Rate: 25 Hz max
Internal Logging: 32 GB Internal



INS/DVL Combined Unit

Combined INS and DVL 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 Lodestar and 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, Lodestar/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 internal components. When supplied together, most combinations of Lodestar/SPRINT and Syrinx are unlikely to require a re-export licence, making shipping easier.





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