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The 3DM-DH can measure static and quasi-dynamic rotations with an accuracy of:

  • pitch +/-0.7 degrees (typical)
  • roll +/-0.7 degrees (typical)
  • yaw +/-1.5 degrees (typical)

The FAS-A can measure static and quasi-dynamic rotations with an accuracy of +/-0.7 degrees typical.

 

 

The FAS-A can measure 360 degrees in single axis mode and +/-70 degrees in dual axis mode.

The 3DM-DH is a 3-axis orientation sensor capable of measuring:

  • -180˚ to + 180˚ of yaw (heading)
  • -180˚ to +180˚ of roll
  • -90˚ to +90˚ of pitch (see note following)

Note: The 3DM-DH has a pitch range of +/-90˚.  It will measure pitch accurately within this range.  However, due to a mathematical singularity in the Euler theorem, as pitch exceeds either -70˚ or +70˚, the yaw and roll measurements of the 3DM-DH will become numerically unstable.  So to put it another way, if you are just measuring pitch with the device, all measurement between -90˚ and +90˚ will be accurate.  If you are measuring pitch and roll at the same time (for example), pitch measurements beyond -70˚ or + 70˚ will effect the accuracy of the roll.

Kalman Filter Performance

Typical position accuracy †

±2.5 m RMS horizontal, ±5 m RMS vertical

Typical velocity accuracy †

±0.1 m/s to ±0.75 m/s RMS (application and settings dependent)

Typical attitude accuracy †

±0.35 deg RMS roll &

† RMS values generated from actual vehicle testing (airborne & land) when compared to a reference navigation unit

Attitude and Heading (AHRS)

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

GPS Receiver

GPS velocity accuracy

0.1 m/sec

GPS heading accuracy

0.5°

GPS horizontal position accuracy

< 2.5 m Autonomous

< 2.0 m SBAS (CEP, stationary 24 hours, SEP 3.5 m)

GPS timepulse signal accuracy

30 nsec RMS

< 60 nsec 99%

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

 

Static accuracy

±0.5° pitch, roll, heading typical for static test conditions

Dynamic accuracy

±2.0° pitch, roll, heading for dynamic (cyclic) test conditions and for arbitrary angles

Important note: Unlike the -25, the -15 does not contain magnetometers.  Magnetometers measure Earth's magnetic fields and provide the AHRS with a reference to produce an accurate heading.  In the -15, the heading is accurate from moment to moment but drifts over time and should not be relied upon.

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