In this paper, we present DGS, a driving guidance system based on wireless
sensor networks (WSN) which guides a driver to drive a car in safety. The
system consists of two sub-systems: SMS (speed measurement sub-system)
and WPS (weather information providing sub-system).
SMS measures the speed of a car and captures the image of the speeding car
using a speed camera. WPS provides weather information including the road
conditions (icy, wet, etc.) via VMS or a telematics terminal. The paper
describes the overall system architecture of DGS from the hardware platform
to the application software in the view point of a WSN.
We implemented the WSN based SMS of DGS from hardware to application
software. The experimental results show that the accuracy of speed
measurement is over 99% at 80 kmph and the predicted battery life-time using
measured current profiles is about 3 years.
We also discuss the lessons acquired from the real-life experiments we
performed. We believe that the lessons can be useful in other WSN
applications as well as in typical telematics applications.
