A process for setting the transmission frequency of a...

Details A process for setting the transmission frequency of a... A process for setting the transmission frequency of a...

G - Physics

01

S

G01S 7/52 (2006.01) G01S 7/527 (2006.01) G01S 15/08 (2006.01) G01S 15/10 (2006.01)

Patent

CA 2124954

In order to set a range finding instrument operating according to the echo-sounding principle using sonic or ultrasonic pulses to an optimum transmission frequency, the transmission frequency is altered stepwise within a predetermined frequency range. During each reception spell following on the transmission of a sonic or ultrasonic pulse an amplitude-time-profile of the received signals is formed and integrated. The integration values obtained for the various transmission frequencies are stored, and an optimum transmission frequency is set to that frequency at which the maximum integrated value is obtained. In order to eliminate the effects of background noise on the determination of the optimum transmission frequency a mean noise amplitude of the received signals is determined and subtracted from the amplitude-time-profile of the received signals before integration.

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