Importance

Loading Importance Indicators...

Abstract

The invention relates to a method for determining a frequency line pattern within at least one amplitude spectrum generated from acoustic signals that are emitted from at least one detected vehicle and received by means of a sonar installation. First, a predetermined number of frequency lines is selected in the (or each) amplitude spectrum, and by sorting them on their amplitude size and on the basis of a threshold value which ensures that the pre-determined, appropriate number is not exceeded. After several threshold values are set, a comparison of frequency lines with each other takes place for those that have been selected taking into account at least one threshold value. The preliminary frequency line set with associated fundamental frequency, evaluated because of its recognizable structures, is then determined, by comparing the line pairs formed. Using a process of elimination, final frequency line sets are formed, under consideration of an assessment which depends on the sequence, number, density, and amplitude of the fundamental frequency of the frequency lines. Then strong individual lines can be found, which are possibly contained in the spectrum. A target-related frequency line pattern is assigned to each detected vehicle, based on which the classification of the vehicle becomes possible.

Loading the Abstract Image...

First Claim