Patent ID: 7864303

Claim:
A method for electronic measurement based on the principle of heterodyne reception, comprising the acts: transmitting a pulsed electromagnetic radiation having at least one pulse repetition frequency to a target; receiving a back-scattered radiation from the target, the back-scattered radiation being converted into a received signal; converting down the received signal by mixing with at least two pulsed mixer signals to give at least two output signals, including: mixing the received signal with a first pulsed mixer signal for producing a first output signal having a frequency lower than the at least one pulse repetition frequency; mixing the received signal with a second pulsed mixer signal for producing a second output signal having a frequency lower than the at least one pulse repetition frequency, wherein the first pulsed mixer signal is phase-shifted relative to the second pulsed mixer signal; and determining at least one time-related variable from at least the first and second output signals.