Method for the signal evaluation of signals of a rangefinder

A method for the evaluation of signals of a rangefinder, particularly of a laser rangefinder, wherein the rangefinder has at least one sensor point, comprising;

• carrying out measurements cyclically with the rangefinder by
• emitting with the rangefinder a plurality of measurement points for each measurement, wherein each one of the measurement points indicates a distance from a sensor point, and
• measuring distances in a plurality of directions with the rangefinder, wherein a horizontal angle is associated with each one of the measurement points,
• differentiating a plurality of the measurement points into useful signals and interfering signals based on the distance of each measuring point from the sensor point, wherein the measurement points with a distance below a first limiting value are identified as interfering signals, and the measurement points above the first limiting value are identified as useful signals, wherein the useful signals are associated with a first measurement area when the useful signals satisfy a predetermined condition for distance and horizontal angle,
• determining a quantity of the useful signals in the first measurement area and comparing the quantity with a first threshold value, and
• emitting a warning signal when the quantity of useful signals lies below the first threshold value.