Real time synchronization for a small group of wireless sensor network system implemented with a DSP

Abstract

The Wireless Sensor Networks (WSNs) consist of multiple sensor nodes and one gateway or one server which can gather each sensor node's data. The server makes information using the sensing data. Therefore it is important for the server to know whether the each sensor node's data is worthy to agglomerate or not. One of the agglomeration criteria is the time data of the detection message. When the sensor node placed in a shadow area, the GPS module is not available and if the RTC (Real Time Clock) module battery is week, time synchronization using the dsp cpu timer is effective.