Procedure for setting the transmission frequency of a remote sensing device operating according to the Echolot principle

摘要

In order to set the optimum transmission frequency in a distance measuring equipment working according to the echo-sounding principle with sonic or ultra-sonic pulses, the transmission frequency is gradually changed in a predetermined frequency range. During each reception interval following the transmission of a sonic or ultra-sonic pulse, the amplitude-time profile of the reception signals is formed and integrated. The integration values obtained for the various transmission frequencies are stored and the frequency for which the maximum integration value was obtained is set as optimum transmission frequency. In order to eliminate the influence of noise on the determination of the optimum transmission frequency, the mean noise amplitude of the reception signals is determined and deduced from the amplitude-time profile of the reception signals before its integration.