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Motion Reference Unit and Inertial Navigation Systems
This is a typical configuration, with the inertial sensors mounted close to the sonar head.
The inertial sensor is connected to the Navsight GNSS which integrates a survey grade dual antenna GPS/GNSS receiver.
Navsight GNSS fuses real time inertial data with GNSS information and transmits this data to a computer and sonar.
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Shom to select SBG INS for bathymetry
Shom, the French national hydrographic and oceanographic office Shom, as a public institution, has 3 major objectives: national hydrography and cartography, defense support in hydro-oceanographic fields, and support in maritime geospatial products and services for public policies on the sea and the coast. The fleet used by Shom is based in Brest and is composed … Continued
Test Conditions The SBG Inertial Navigation Systems have been tested during a three-day lasting hydrographic survey in the Hamburg (Germany) port area. SBG Systems and MacArtney Germany GmbH equipped a survey vessel with a complete Multibeam Echosounder survey configuration and conducted various tests to show the performance of the SBG Inertial Systems in different challenging … Continued
OPSIA integrates the Ekinox INS in its MBES and MMS solution
Combining Terrestrial Scanning with MBES The increasing demand for high-resolution 3D bathymetric surveys at ever-increasing depths requires constant innovation from industry stakeholders. With this arises one major challenge: the recalculation between the terrestrial and bathymetric 3D models. OPSIA, a French engineering office specialized in all kinds of surveys, decided to take on the challenge and to … Continued
Tips
The Motion Reference Unit (MRU) provides roll, pitch, and heave. The GNSS receiver provides heading and position. Data is provided to the echo-sounder. The Inertial Navigation System (INS) fuses all inertial data with GNSS information in real-time to provide the echo-sounder with more robust data. If there is a communication cut, or a GNSS outage, due to a bridge crossing, for instance, the Inertial Navigation System will maintain the position information until a new fix is acquired.
Apogee-D integrates a tri-frequency receiver compatible with TerraStar and Veripos. In addition to these positioning services, MarineStar and OmniStar are also available when buying the Navsight Solution. Specify to the SBG rep which positioning service is desired for your operation.
SBG sensors are compatible with all software accepting ASCII, NMEA, and TSS protocols. Various hydrographic software have developed driver accepting the SBG binary protocol. Read the article.
When wave frequency is erratic or in case of long period swell, the delayed heave feature can save the day by allowing survey in rough conditions. This algorithm allows a more extensive calculation, resulting in a heave accurate to 2.5 cm for Ekinox sensors, and 2 cm for Apogee. Delayed heave data are displayed in real-time with a little delay.
If you mount the inertial sensor in the cabin, you can choose the surface models (A, E, N, or D). If you prefer installing the inertial sensor close to the echo-sounder head, then a titanium enclosure is required (Navsight subsea models). If you install the sensor on board, then a subsea enclosure will be preferred as well. Even though the surface enclosure is IP68, salt water can damage it if long exposure, or not cleaned.