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Process for setting the transmission frequency of a distance measuring instrument operating according to the echo-sounding principle

  • US 5,511,041 A
  • Filed: 06/01/1994
  • Issued: 04/23/1996
  • Est. Priority Date: 10/02/1992
  • Status: Expired due to Fees
First Claim
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1. A process for determining and setting an optimum transmission frequency of a distance measuring instrument operating according to an echo-sounding principle, including at least one electro-acoustic transducer for emitting sonic or ultrasonic pulses and for converting received sonic or ultrasonic signals into electric received signals, a frequency-adjustable oscillator for generating an electric signal having a frequency corresponding to the transmission frequency of the sonic or ultrasonic pulses which are to be transmitted for activating the electro-acoustic transducer, and an evaluation circuit for determining the travelling time of the sonic or ultrasonic pulses as a measure of the distance of a target object, the process for determining and setting the optimum transmission frequency comprising the steps of generating an amplitude-time-profile of the received signals during each of a plurality of reception intervals following the emission of a sonic or ultrasonic pulse, integrating each amplitude-time-profile to produce a plurality of integrated values for different transmission frequencies, storing the integrated values, and tuning the transmission frequency to a selected frequency corresponding to a maximum integrated value.

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