SL869-3DR Evaluation Kit User Guide
1VV0301266 r0
2016-11-14
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Page 10 of 35
Mod. 0810 2011-07 Rev.2
2.
Dead Reckoning Overview
Dead reckoning (DR) is the process of estimating one’s current position based upon a previously
determined position or “fix”, and advancing that position from course and speed data (which
could be either estimated or measured).
The SL869-3DR receiver provides the user with accurate estimates of a vehicle’s position and
speed, even during interruptions in GNSS information, combining the best features of GNSS and
Sensor navigation.
Figure 2-1 DR Operation in the absence of GNSS signals
When GNSS data is available, it provides navigation updates and corrections for sensor drift.
When the GNSS signal is interrupted, sensor data (speed and heading) are used to compute the
navigation solution.
The result is improved navigation in challenging environments such as urban canyons.
