Patent ID: 8892352

Claim:
A method for detecting a position with respect to a defined area comprising: providing a current signal in a boundary conductor, which surrounds the defined area, according to a boundary signal which has been provided, the boundary signal corresponding to a pseudo-random signal; receiving a detection signal from a magnetic field generated by the current signal in the boundary conductor; generating a reconstructed boundary signal from the detection signal; providing a reference signal having a bit pattern corresponding to the boundary signal which has been provided; identifying a maximum magnitude correlation in a plurality of correlations between the reference signal and the reconstructed boundary signal, each correlation in the plurality of correlations being performed with one temporal offset in a plurality of temporal offsets between the reference signal and the reconstructed boundary signal; and determining a position inside of the defined area in response to the maximum magnitude correlation being a positive value that is greater than a predetermined positive correlation threshold or another position outside of the defined area in response to the maximum magnitude correlation being a negative value that is less than a predetermined negative correlation threshold.