2 research outputs found
Clock Error Analysis of Common Time of Flight based Positioning Methods
Today, many applications such as production or rescue settings rely on highly
accurate entity positioning. Advanced Time of Flight (ToF) based positioning
methods provide highaccuracy localization of entities. A key challenge for ToF
based positioning is to synchronize the clocks between the participating
entities. This paper summarizes and analyzes ToA and TDoA methods with respect
to clock error robustness. The focus is on synchronization-less methods, i.e.
methods which reduce the infrastructure requirement significantly. We introduce
a unified notation to survey and compare the relevant work from literature.
Then we apply a clock error model and compute worst case location-accuracy
errors. Our analysis reveals a superior error robustness against clock errors
for so called Double-Pulse methods when applied to radio based ToF positioningComment: Published in IEEEXplore:
https://ieeexplore.ieee.org/abstract/document/891177
A Generalized TDoA/ToA Model for ToF Positioning
Many applications require positioning. Time of Flight (ToF) methods calculate
distances by measuring the propagation time of signals. We present a novel ToF
localization method. Our new approach works infrastructure-less, without
pre-defined roles like Anchors or Tags. It generalizes existing
synchronization-less Time Difference of Arrival (TDoA) and Time of Arrival
(ToA) algorithms. We show how known algorithms can be derived from our new
method. A major advantage of our approach is that it provides a comparable or
better clock error robustness, i.e. the typical errors of crystal oscillators
have negligible impact for TDoA and ToA measurements. We show that our channel
usage is for most cases superior compared to the state-of-the art.Comment: Published in IEEEXplore:
https://ieeexplore.ieee.org/abstract/document/891174