Centrale inertielle SBG Ellipse A Marine AHRS

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SBG Ellipse A Marine AHRS Inertial Measurement Unit

The SBG Ellipse A Marine AHRS inertial measurement unit is a compact and robust system designed for precise orientation (0.1° in roll/pitch, 0.8° in heading) and heave (5 cm) in marine environments, with an integrated algorithm.

Model: Ellipse A

Ellipse A Ellipse D

Configuration: Standalone display unit

Standalone display unit Complete kit

Retail priceBenefit from the professional rate

£1,927.08 GBP

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In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

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Support service

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Technical specifications

Type de système	AHRS
Usage marin	Navigation, Stabilization, Bathymetric Surveys
GNSS intégré	no
RTK / PPK	no
Précision roulis/tangage (°)	0.1
Précision du cap (°)	0.8
Heave en temps réel	yes
Interfaces	RS-232, RS-422, USB, CAN
Protocoles de sortie	NMEA, sbgECom, REST API, TSS, KVH, Dolog
Indice IP	IP68
Température min (°C)	-40.0
Température max (°C)	85.0
Tension d'entrée (V)	5 - 36 VDC
Consommation (W)	0.3
Dimensions (mm)	46 x 45 x 24 mm
Poids (g)	45.0

Detailed description

The SBG Ellipse A Marine AHRS inertial measurement unit is a compact and rugged attitude and heading reference system (AHRS) designed for precise determination of orientation and heave in dynamic marine environments. Integrating an industrial-grade MEMS-based inertial measurement unit (IMU) and calibrated magnetometers, it provides reliable data for demanding applications such as underwater navigation, equipment stabilization, and surface motion tracking.

Technical performance and accuracy

The Ellipse A delivers exceptional attitude accuracy with a roll and pitch error of 0.1° in static mode, and 0.4° in dynamic marine conditions. Magnetic heading is provided with an accuracy of 0.8° in static mode after calibration, under a homogeneous magnetic field. A next-generation heave algorithm automatically adjusts wave period (up to 15–20 seconds), ensuring an accuracy of 5 cm or 5% (whichever is greater), critical for bathymetric surveys and dynamic positioning systems.

Onboard sensors include accelerometers (marine range ±8 g), gyroscopes (marine range ±450 °/s), and magnetometers (50 Gauss range). These sensors are paired with advanced filters for effective vibration management (8 g RMS resistance from 20 Hz to 2 kHz per MIL-STD 810G) and sophisticated magnetic calibration for enhanced robustness against transient magnetic disturbances. The IMU data output rate can reach 1 kHz, ensuring optimal responsiveness for stabilization and pointing applications.

Expert opinion

Pol CONIN

Digital Manager

« Technical evaluation of the SBG Ellipse A Marine inertial navigation unit »

The SBG Ellipse A Marine AHRS inertial navigation unit is a technical solution of choice for marine applications requiring precise attitude and heave determination. Its compact design (46 x 45 x 24 mm, 45 g) facilitates integration in confined spaces, a major advantage for vessels of all sizes. Its robustness is an undeniable strength: the IP68 housing ensures waterproofing against harsh marine environments, while compliance with MIL-STD 810G vibration tests (8 g RMS) and shock tests (500 g) guarantees operational reliability even in extreme conditions. The Ellipse A's ability to provide heave data with 5 cm accuracy, automatically adjusted to wave period, is critical for dynamic positioning systems, bathymetric surveys, or equipment stabilization. The integration of magnetometers with advanced calibration offers valuable redundancy for magnetic heading, particularly useful in case of GNSS failure or unavailability. Multiple interfaces (RS-232, RS-422, USB, CAN) and NMEA compatibility simplify integration with most existing navigation systems. The sbgCenter software streamlines configuration and monitoring, making the device accessible to integrators. With an MTBF of 218,000 hours and factory calibration over a wide temperature range (-40 to 85 °C), long-term durability is ensured.

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SBG Ellipse A Marine AHRS Inertial Measurement Unit

£1,927.08 GBP

Frequently Asked Questions

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What is the SBG Ellipse A Marine AHRS inertial navigation unit and what is it used for?

The SBG Ellipse A Marine AHRS inertial navigation unit (Attitude and Heading Reference System) is a compact and rugged sensor designed for marine applications. It integrates an Inertial Measurement Unit (IMU) and magnetometers to provide reliable orientation data (roll, pitch, heading) and heave in dynamic environments, even in the presence of transient magnetic disturbances.

What is the accuracy of the roll, pitch, heading, and heave measurements of the Ellipse A Marine?

The Ellipse A Marine IMU provides high accuracy for its measurements:

Roll / Pitch: 0.1° (static)Heading (magnetic): 0.8° (under homogeneous magnetic field after calibration)Heave: 5 cm or 5% (whichever is greater), with automatic wave period adjustment (up to 20 seconds).

Is the Ellipse A Marine IMU waterproof and shock-resistant for marine environments?

Yes, the Ellipse A Marine IMU in its housing version is designed to be robust and resistant to marine environments. It is IP68 certified, ensuring resistance to dust and immersion in water (1 hour at 2 meters depth). Additionally, it meets MIL-STD 810G vibration standards (8 g RMS from 20 Hz to 2 kHz) and shock resistance (500 g for 0.1 ms), ensuring operational reliability even in extreme conditions.

What are the power supply requirements for the SBG Ellipse A Marine inertial measurement unit?

The SBG Ellipse A Marine AHRS inertial measurement unit requires a direct current (DC) power supply. The accepted input voltage range is 5 to 36 VDC. Its power consumption is very low, under 300 mW.

Which communication interfaces does the Ellipse A Marine IMU provide?

The Ellipse A Marine IMU features multiple communication interfaces for easy integration:

Serial interfaces: RS-232, RS-422, USB (up to 2 Mbps)CAN interface: CAN 2.0A/B (up to 1 Mbps)Synchronization I/O: 2 sync inputs (RS232), 1 sync output (TTL)It supports protocols such as sbgEcom (binary), REST API, NMEA and other third-party protocols, with an output rate up to 1 kHz for IMU and Euler data.

With which software or platforms is the SBG Ellipse A Marine IMU compatible?

The Ellipse A Marine IMU is compatible with several tools and platforms to simplify its use and integration:

sbgCenter: Software provided by SBG Systems for configuration, monitoring, and data logging.
ROS (Robot Operating System): A driver is available for full compatibility with this open-source software collection for robotics.
Pixhawk: Open-source hardware platform used for autopilot systems in drones and other unmanned vehicles.

What is the weight and dimensions of the Ellipse A Marine inertial measurement unit?

The Ellipse A Marine inertial measurement unit is designed to be very compact and lightweight. Its dimensions are 46 x 45 x 24 mm and it weighs only 45 g for the housing version. An OEM version is also available with dimensions of 29.5 x 25.5 x 11 mm and a weight of 8 g.

What is the warranty duration for the SBG Ellipse A Marine AHRS inertial measurement unit?

The SBG Ellipse A Marine AHRS inertial measurement unit comes with a 2-year manufacturer warranty.

Does the Ellipse A Marine IMU require regular recalibration?

No, each SBG Ellipse A Marine sensor undergoes a thorough calibration and testing process in the factory across its entire operating temperature range. This ensures the product will meet its specifications throughout its lifespan without requiring recalibration.

Are there different versions of the Ellipse A Marine central unit, for example for OEM integration?

Yes, the Ellipse A Marine central unit is available in two main versions:

A boxed version, with IP68 protection, resistant to dust and water. Its dimensions are 46 x 45 x 24 mm and its weight is 45 g.

An OEM version, mounted on PCB, designed for compact integration. Its dimensions are 29.5 x 25.5 x 11 mm and its weight is 8 g.

How does the Ellipse A Marine IMU handle heave and wave period adjustment?

The Ellipse A Marine IMU integrates high-performance accelerometers and a state-of-the-art heave algorithm. It provides accurate heave data for marine applications, with a precision of 5 cm or 5% (whichever is higher). The system automatically adjusts to wave periods, supporting periods from 0 to 20 seconds.

What is the average lifespan (MTBF) of the SBG Ellipse A Marine AHRS inertial navigation system?

The calculated mean time between failures (MTBF) for the SBG Ellipse A Marine AHRS inertial navigation system is 218,000 hours.

Which motion profiles are supported by the Ellipse A Marine IMU?

The Ellipse A Marine IMU supports a variety of motion profiles for different applications. Profiles include:

Airborne: airplane, fixed-wing drone, helicopter, UAV. Marine: marine, submarine. Land: automotive, heavy machinery, off-road vehicle, pedestrian, rail, static, truck.

Does the Ellipse A Marine AHRS accept external input data?

No. The technical documentation states that input protocols are not applicable (N/A) for the Ellipse A Marine AHRS. It is primarily designed to provide orientation and heave data. However, it features 5 Sync IN inputs for event markers or PPS up to 1 kHz.

Where can I find the technical documentation and installation guides for the Ellipse A Marine autopilot system?

The Ellipse A Marine autopilot system comes with complete documentation. This includes installation guides, advanced configuration information, troubleshooting tips, and detailed manuals for seamless integration and operation. Test reports and firmware update procedures are also available. These resources are provided to assist users at every stage.