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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.

Uploads to SensorCloud are typically dominated by the data content, with minor additional overhead for secure communications.   One simple method to estimate upload bandwidth is to multiply the number of samples to be uploaded by 12 bytes.   Each uploaded sample contains an 8 byte field for the timestamp, and a 4 byte field for the value.   Example:  If you have three nodes with one channel active all sampling at 32 Hz, your effective upload rate would be 96 samples per second.    Multiplying by 12 bytes per sample, this amounts to 1,152 bytes per second.  This amounts to 2,985,984,000 bytes over the course of a month, or approximately 2.78 GB.

Yes, the WSDA-Base-101 can indeed be powered by both power sources at the same time.  The base station will use whatever power source has the higher voltage.

Please refer to page 29 of the WSDA-Base-101 user manual: http://files.microstrain.com/WSDA-Base-101-Analog-Output-Base-Station-User-Guide.pdf

In a word, no.  Precise Point Positioning is a Global Navigation Satellite System (GNSS) positioning method to calculate very precise positions up to few centimeter level using a single (GNSS) receiver in a dynamic and global reference framework like International Terrestrial Frame (ITRF).  The 3DM-GX3-45 is not capable of this precision.

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