Abstract:

To improve the distance measurement accuracy between sensory nodes, the sources of errors in time difference of arrival (TDOA) distance measurement based on tiny micro threading operating system (TinyOS) were studied. A series of correction methods were put forward on average temperature of path compensation, timing factor compensation and bit synchronization compensation. Based on the least square method, a mathematic model was built to modify the results. Experiments show that the correction algorithm and the mathematical model can control the errors effectively and improve the precision in distance measurement.

Key words: wireless sensor networks, localization, distance measurement, measuring error