105
1. Connect power and a laptop to the system.
2. Commit a default setting to the RT using NAVconfig, then run NAVdisplay.
3. Click the Calibration button, then select the Navigation tab and scroll to view the
x, y, and z angular rates (values 30 to 32).
4. Rotate the RT according to Table 38 and check the angular rate measurements
occur.
5. With the unit stationary, check all the angular rates are within ±5°/s. (In general
they will be within ±0.5°/s, but the algorithm in the RT will work to specification
with biases up to ±5°/s).
Table 38. Angular rate measurement specifications
Orientation
x y z
Angular rate measurement
+ve Zero Zero The x-axis should indicate positive rotation, others are
small.
–ve Zero Zero
The x-axis should indicate negative rotation, others are
small.
Zero +ve Zero The y-axis should indicate positive rotation, others are
small.
Zero –ve Zero The y-axis should indicate negative rotation, others are
small.
Zero Zero +ve
The z-axis should indicate positive rotation, others are
small.
Zero Zero –ve The z-axis should indicate negative rotation, others are
small.
It is hard to do a more exhaustive test using the angular rate sensors without specialised
software and equipment. For further calibration testing it is necessary to return the unit
to OxTS.
Note that the RT is capable of correcting the error in the angular rate sensors very
accurately. It is not necessary to have very small values for the angular rates when
stationary since they will be estimated during the initialisation process and warm-up
period. This estimation process allows the RT to go for long periods without requiring
recalibration.
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