Patent ID: 7800737
Filing Date: 2010-09-21
Classification: G01S

Abstract:
1. A distance measurement method for use in a laser range finding device to measure a distance between the laser range finding device and a target, comprising: transmitting a laser signal to the target in a first time point; receiving a reflected laser signal reflected by the target; obtaining a digital signal having a plurality of signal values by sampling the reflected laser signal with a sampling signal, wherein the signal values range from 0 to N where N is a positive integer greater than two; finding a maximum signal value among the signal values of the digital signal; calculating the distance between the laser range finding device and the target according to the first time point and a second time point corresponding to the maximum signal value; identifying a first signal value from the signal values by a specific rule; determining whether a difference of the maximum signal value and the first signal value is not less than a first threshold level; if so, determining that the maximum signal value is a target signal; and determining that the found maximum signal value is a noise signal when the difference of the maximum signal value and the first signal value is less than the first threshold level.