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This paper proposes a synch-free RF Time-of-Flight (ToF) measurement system as an epoch-making protocol of RF ToF ranging for wireless sensor networks (WSNs). This system is based on vernier effect due to two heterogeneous clocks, which are basically adopted in order to generate new virtual time resolution much smaller than the intrinsic time resolution of two clocks of which the ratio is n:(n-1)...
To recognize the position of moving objects, facilities or important equipments has been regarded as a hot issue in the future environment which needs ubiquitous characteristics. Furthermore, it is indispensably needed to acquire location data in order to realize an infrastructure of sensor network system. Namely, to get distance data is the preliminary information to complete localization of a moving...
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