LEA-6 / NEO-6 / MAX-6 - Hardware Integration Manual
UBX-14054794 Production Information Appendix
Page 82 of 85
performance can already be expected, as all sensors are calibrated. Still further fine calibration will be ongoing
with good GPS reception and, if a temperature sensor is available, the temperature compensation table will be
filled. Gyro offset values are measured as soon as the car stops for more than 3 seconds and are stored in the
temperature compensation table to further increase the performance.
The above instructions result in a calibration status within the shortest period of time. Should traffic, road
and regulatory conditions not allow such a calibration drive, the time until optimum calibration will
increase. However navigation results are already satisfactory after a relatively short driving distance and
time.
The above instructions shall not be made a rule towards any end user. They shall only be
applied in a testing environment where sufficient care is taken that these driving instructions
can be carried out without creating any risk of accidents or violation of regulations.
Consequences of a bad/wrong calibration procedure
u-blox SFDR Technology needs well-calibrated sensors to have optimal performance. A poorly calibrated system
will report wrong positions and headings during GPS loss. Also the performance is degraded during good GPS
performance, as the position output with good GPS performance will be combined with the poor data from the
sensors.
As long as the miscalibration is minor (e.g. change of tires from summer to winter tires), the system will recover
itself. If the miscalibration leads to a ‘sensor integrity check error’ (the receiver reports GPS only solutions), a
reset of the calibration data and new initial calibration is required.
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