Patent ID: 6288777
Filing Date: 2001-09-11
Classification: G01S

Abstract:
A system for determining at least one physical quantity based on a relation between a transmission signal and a reception signal, comprising:a transmitter configured to generate and emit a transmission signal having a predetermined frequency based on a first clock signal output by a master oscillator;a receiver configured to receive the reception signal, the reception signal being the transmission signal at said predetermined frequency after said transmission signal has passed through a signal path, said reception signal containing information corresponding to said at least one physical quantity;a reference signal generator configured to generate a reference signal having a frequency which has a predetermined non-zero fixed relation to the frequency of the transmission signal;a first mixer configured to mix the reception signal with the reference signal to produce a single intermediate frequency signal having an intermediate frequency and containing said information corresponding to said at least one physical quantity; anda processor configured to receive the single intermediate frequency signal and a second clock signal output by the master oscillator and to determine the at least one physical quantity directly from said single intermediate frequency signal and the second clock signal.