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.