When Nortek started designing its new survey package, it required an accurate and cost effective navigation
Nortek designs, develops and produces scientific instruments that apply the Doppler principle to underwater acoustics in order to measure water in motion, such as currents and waves. These instruments are used by scientists, researchers and engineers at renowned institutions and government agencies worldwide. They are employed in demanding environments that require state-of-the-art instrumentation that is reliable and easy to use.
Nortek’s vessel-mounted ADCP package – called Signature VM – opens up new opportunities to the survey community, while offering operational convenience and reduced complexity. Data quality can be safeguarded, and both errors and initial installation time can be substantially reduced by using an integrated system where each is module is pre-qualified.
Herman Huitema, the VM Product Manager, reveals in detail how his team used Advanced Navigation’s GNSS Compass in their surveying solution.
What challenge did you have to solve?
A Vessel Mounted ADCP measures a velocity profile and the velocity direction below a sailing vessel. To correct the measured values for the vessel speed and direction, ADCP measurements require accurate velocity and heading information. Besides the use of bottom track within the ADCP itself such information can be provided externally using a GNSS receiver and a non-magnetic heading source as a gyro compass. Until today the use of external correction sources has always been challenging to interface and require accurate timing as delays in heading and speed can significantly deteriorate the ADCP data.
How did Advanced Navigation help you solve this?
The GNSS Compass not only provides geographical information and velocity information but its dual antenna design also provides accurate non-magnetic heading information.
By making use of today’s modern Ethernet instruments, such as the Signature ADCP and the GNSS Compass, we can guarantee nanosecond time synchronization by making use of the Ethernet PTP protocol.
Data from the ADCP can be exactly aligned with the GNSS Compass information. Making use of plug and play Ethernet instruments has many benefits against the old-style serial instruments.
”GNSS Compass is an easy, time and cost-effective instrumentHerman HuitemaVM Product Manager, Nortek
What Made You Choose Advanced Navigation?
GNSS Compass is an easy, time and cost-effective instrument in comparison with old-style set-ups using serial gyro compasses and GPS instruments that need valuable installation time and a dedicated engineer to be set up correctly. We integrated the GNSS Compass in our Signature VM package to offer our users a quick and easy set-up which people expect from today’s modern technology.
The GNSS Compass is an all-in-one GNSS/INS navigation and heading solution. It provides accurate dual-antenna GPS-based heading that is not subject to magnetic interference and can maintain accurate heading during GNSS outages of up to 20 minutes. It features high accuracy RTK positioning and is plug and play with NMEA 0183, NMEA 2000, and Ethernet interfaces.