Electronic theft-preventing system and method

A method of detecting a theft-related event using a system comprising:

• a first multi-axis magnetometer arranged in a first station and configured to output a first vector signal representing movement of a first magnetic field vector;
• a second multi-axis magnetometer arranged in a second station and configured to output a second vector signal representing movement of a second magnetic field vector;
• and
• a signal processor coupled to receive the first vector signal and the second vector signal the method comprising:
• estimating a multi-dimensional transformation, which represents a difference between the first magnetic field vector and the second magnetic field vector, and which is estimated over periods of time in accordance with optimization of a difference between the first vector signal and the second vector signal;
• compensating the second vector signal in response to a compensation signal generated from a transformation of the second vector signal defined by the multi-dimensional transformation;
• determining that a detector signal, which is responsive to the second vector signal that has been compensated, meets a predefined criterion;
• and
• in response to at least the determining that the detector signal meets the predefined criterion, raising or forgo raising an alarm that warns about a possible theft-related event.