SBG Ellipse-A Land/Air AHRS inertial measurement unit - serial interface

The SBG Ellipse-A Land/Air AHRS inertial measurement unit is a compact and rugged attitude and heading reference system (AHRS). It integrates an inertial measurement unit (IMU) with magnetometers to provide reliable and precise orientation (roll, pitch, heading) in dynamic environments while resisting transient magnetic disturbances.

The Ellipse-A AHRS provides attitude data, including roll, pitch, and heading. It is not designed to provide position.

The Ellipse-A IMU integrates the following sensors:

• 3-axis MEMS accelerometers with a measurement range of +/- 20g.
• 3-axis MEMS gyroscopes with a measurement range of +/- 450°/s.
• 3-axis MEMS magnetometers with a range of 50 Gauss.
• A barometer.

Each sensor is individually calibrated across the full operating temperature range.

The Ellipse-A provides the following accuracies (error 1-sigma across the full temperature range):

• Roll / Pitch: 0.1° in static and 0.4° in dynamic.
• Heading: 0.8° in static and 1° in dynamic (with a homogeneous magnetic field after calibration).

The Ellipse-A unit in its housing has the following dimensions: 46 x 45 x 24 mm. Its weight is 45 g.

The Ellipse-A IMU is designed to operate across a wide temperature range, from -40°C to +85°C. All sensors are individually calibrated across this range to ensure consistent specifications.

No, the Land/Air version of the Ellipse-A does not provide heave measurement. This feature is available only on the Marine version of the Ellipse.

For the first use of an Ellipse in a housing, purchasing the cable CA-ELI-USB-3M (reference 100-0776) is mandatory. This 3-metre cable allows easy connection to a PC via USB, includes a RS-232 to USB converter, and provides power to the sensor. It is required for configuration and firmware updates.

For integration into a system, the following open-ended cables are available:

• CA-ELI-RS232-CAN-3M (reference 100-0777): For RS-232 and CAN communication.
• CA-ELI-RS422-3M (reference 100-0778): For RS-422 communication.

These cables provide access to the Ellipse’s main and auxiliary connectors.

No, the Ellipse-A AHRS cannot accept external GNSS aid for heading calculation. Its only heading source is its integrated internal magnetometer.

The Ellipse-A supports multiple communication protocols, including:

• sbgEcom (binary)
• REST API
• NMEA
• Other third-party protocols

The Ellipse-A requires an input voltage of 5 to 36 VDC.

The Ellipse-A power pack draws less than 300 mW.

The Ellipse-A IMU can output data (IMU and Euler angles) at a rate up to 1 kHz.

The Ellipse-A unit is supplied alone. The CA-ELI-USB-3M cable (part number 100-0776), required for initial use, is sold separately.

The Ellipse-A autopilot core has a 2-year warranty.