Patent ID: 7672809

Claim:
A receiver for receiving an amplitude modulated ultrasonic signal from a transmitter to form an analysis signal on the basis of the received amplitude modulated signal; the receiver comprising: a first receiving element for receiving the amplitude modulated ultrasonic signal from a transmitter to form a first demodulated analysis signal on the basis of the received signal; a second receiving element for receiving the amplitude modulated ultrasonic signal from the transmitter to form a second demodulated analysis signal on the basis of the received signal; a phase detector for providing an indication on the basis of a phase difference between said first and second demodulated analysis signals; and an analyzing element for analyzing said indication to determine a heading angle of an object operatively connected to the receiver, wherein said analyzing element comprises a first scaling element, a second scaling element, an input for inputting said indication, and a control element to adjust scaling parameters of the first scaling element and a second scaling element.