Method and device to identify a periodic light source

摘要

This invention relates generally to devices for location positioning and more particularly relates to a system for identifying an environmental source emitting a base frequency and waveform signal. A sensor ( 101 ) records an environmental source ( 105 ) emitting a base frequency and waveform signal, the signal being amplified ( 102 ), digitized ( 103 ), processed and compared ( 104 ) with a stored unique waveform characteristic. On the basis of the comparison result(s), location positioning and/or a device orientation may be determined. The invention further relates to a method and a computer readable medium containing a program for making a processor carry out the method.