Patent ID: 9268013
Filing Date: 2016-02-23
CPC Classification: G01S

Claim Text:
1. A method for measuring distances of targets by measuring the time of flight of pulses reflected on those targets, comprising the steps of: transmitting pulses having a pulse interval which varies according to a modulation signal as transmitted pulses, and concomitantly recording of reflected pulses as received pulses; determining a first series of distance measurement values, each distance measurement value of said first series being determined from a time of flight between one of the transmitted pulses and that one of the received pulses which is received within a first time window following said transmitted pulse; determining at least a second series of distance measurement values, each distance measurement value of said second series being determined from a time of flight between one of the transmitted pulses and that one of the received pulses which is received within a second time window following said transmitted pulse; and determining which of the first and at least second series of distance measurement values is least affected by the modulation signal as result of the distance measurement, wherein the least affected series is determined by one of the following steps: calculating signal energies of the series and selecting the series having the lowest signal energy; calculating autocorrelations of the series and selecting the series having the highest autocorrelation; calculating cross-correlations of the series with said modulation signal and selecting the series having the lowest cross-correlation; and frequency-analyzing of the series and selecting the series having smallest high-frequency components.