Abstract:
In this paper we have proposed a Time Difference of
Arrival (TDOA) measurement scheme for practical asynchronous
systems using low cost low power target nodes (called tags).
The system performs localization of transmit only tags using
an ultra wide band Impulse radio (UWB - IR). We use a
known location reference node for synchronization between the
receiving (or anchor) nodes. The clock of the reference node is
considered to be a perfect clock whereas clocks of all other nodes,
anchor nodes as well as target node, is assumed to imperfect. We
formulated the equations to synchronize the clocks of the anchor
nodes and estimate the TDOA range measurements between the
anchor nodes. The equations were analyzed with the practical
measurement results.