Hydrography
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.
Recommended products
Navsight Marine - Apogee Grade
From Shallow to Deep Water
Navsight Marine Solution consists of an Inertial Measurement Unit connected to Navsight, a rugged processing unit encompassing our fusion intelligence and optional GNSS receiver. The highly versatile Navsight Apogee is ideal for challenging marine applications, both shallow and deep, and offers the best performance during GNSS outages.
Navsight Ekinox Grade
Shallow Water
Navsight Marine Ekinox Grade consists of an Inertial Measurement Unit connected to Navsight, a rugged processing unit encompassing the fusion intelligence and the optional GNSS receiver. Cost-effective, it is ideal for Shallow Water applications, and light and easy to set for portable sonar systems.
Apogee-E
Connect to External GNSS
Apogee-E is a highly accurate Inertial Navigation System that connects to any survey grade external GNSS receiver for optimal navigation. The highly versatile Apogee-E combined with your GNSS receiver is a cost-effective solution for hydrographic applications, from shallow to deep water.
Case studies
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
Marine / Bathymetry
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
Mapping under Bridges
The catamaran survey vessel named «Spreegrund» serves as survey vessel on German lakes, adjacent canals, and rivers (Berlin, Brandenburg, Eberswalde, and Lauenburg).
Tips
INS or MRU?
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.
Surface or Subsea Enclosure?
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.
What is the Delayed Heave?
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.
MarineStar / OmniStar, TerraStar / Veripos ?
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.
