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Summary of Contents for SBG Systems Ellipse Series
- Page 1 Ellipse AHRS & INS Use in airborne applications Operating handbook Document ELLIPSEOHAIR Support EMEA +33 1 80 88 43 70 Revision Jun 30, 2020 support@sbg-systems.com Americas: +1 (657) 549-5807 support@sbg-systems.com...
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Page 2: Mechanical Installation
Ellipse – Operating Handbook ELLIPSEOHAIR This operating handbook explains how to install and setup an Ellipse in airborne applications such as aircraft, helicopter, or UAV. Mechanical installation is explained as well as software configuration and magnetic calibration. Mechanical installation with alignment, vibration and magnetic field considerations ●... - Page 3 Ellipse – Operating Handbook ELLIPSEOHAIR Magnetic environment If magnetometers are used for heading observation, user should also consider the magnetic environment. The Ellipse magnetometers require for good operation a clean magnetic field. The sensor should be placed away from any magnetic - 2.5m interference such as: DC motors, radios, strobe lights, power supplies etc.
- Page 4 Ellipse – Operating Handbook ELLIPSEOHAIR Dual GPS Antenna Placement Dual antenna systems installation will require special care in order to obtain optimal performance: Same antenna type, same cables with identical lengths must be used for both ● antennas. Both antennas must be turned the same way (connectors oriented in same direction) ●...
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Page 5: Software Configuration
Ellipse – Operating Handbook ELLIPSEOHAIR Software configuration All Ellipse configuration is done through the sbgCenter interface, or using low level communication protocol. Note: At the first access, the Ellipse will have its default configuration. This data output configuration should be used it you want to send logs to Support. Don't hesitate to contact the Support Team for help. - Page 6 Ellipse – Operating Handbook ELLIPSEOHAIR Helicopter ● Rotary Wing UAV ● 6/13...
- Page 7 Ellipse – Operating Handbook ELLIPSEOHAIR Alignment and lever arms Here you can configure the alignment of the device and its lever arm in regard to the center of rotation of the aircraft. On the alignment settings you only need to set up the first two axis, then the third one will be automatically computed.
- Page 8 Ellipse – Operating Handbook ELLIPSEOHAIR Assignment GNSS Receiver assignment Here it is possible to select the serial port to receive the GNSS Receiver data, and select the input Synchronization as well. The Ellipse N and D GNSS are automatically set to “Internal” by default to select the on-board GNSS Receiver.
- Page 9 Ellipse – Operating Handbook ELLIPSEOHAIR Aiding GNSS Configuration Please check following point at the GPS configuration level: Choose this parameter depending on the GPS you are using (NMEA, Ublox or Novatel, Septentrio) Set up the lever arm of the GPS depending on its position on the aircraft ( GNSS Antenna placement).
- Page 10 Ellipse – Operating Handbook ELLIPSEOHAIR Magnetic calibration in airborne applications When magnetometers are used as heading reference, a magnetic calibration is mandatory for normal sensor operation. Different calibration methods are provided, depending on accuracy or ease of use requirement. Light UAV calibration As long as a UAV (fixed or rotary wings) is light enough to be held by a few persons, a 3D calibration, made on the ground is to be preferred.
- Page 11 Ellipse – Operating Handbook ELLIPSEOHAIR The calibration accuracy does not depend on any precise orientation (facing true North for example) and rather depends on how many significantly different orientations have been covered. The calibration algorithms are able to map the 3D magnetic field in orientation that have not really been covered during calibration;...
- Page 12 Ellipse – Operating Handbook ELLIPSEOHAIR Once these tests are done the calibration can end. It is not crucial to perform exact 120° turns, but the procedure should perform rolling points at significantly different headings. In addition the pitching in the first turn should not be performed at the same heading as the one done in the second turn.
- Page 13 Ellipse – Operating Handbook ELLIPSEOHAIR Calibration result examples On the following screen-shots, it is possible to see that the calibration coverage is not a full 3D sphere but covers significantly different orientations. The first screen shows an example of the calibration procedure explained above.
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