Abstract:
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Time synchronization is an important factor to take into account when performing collaborative and
distributed tasks along a sensor network. Message exchange based time synchronization algorithms ported to
underwater acoustic sensor networks, have to deal with high latency communications, besides frame Doppler scaling
and frame detection at the receiver side, which are key points for an accurate synchronization. Furthermore, mobile
sensor networks lead to different propagation times in a bidirectional message exchange, such as the ones used to
synchronize two sensors. In addition to time synchronization algorithm, a first order kinematic model in conjunction
with Doppler estimation can be applied to precise frame time stamping and avoid drift between clocks. In this paper we
present a complete time synchronization scheme optimized for mobile network, tested in simulation and experimented
in real tests demonstrating high performance in time synchronization accuracy. |