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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.
Here is a technical note on the subject: http://files.microstrain.com/NumberedTechNotes/Inertial/TN-I0025-3DM-GX3-25-Capture-Gyro-Bias.pdf
Here is a link to the 3DM-GX3-45 Theory of Operation: http://files.microstrain.com/3DM-GX3-45_Theory_of_Operation.pdf
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.
See this How-to video on how to change the base and node operating frequency:
