Laser range finding device and distance measurement method thereof

A laser range finding device for measuring a distance between the laser range finding device and a target, comprising:

• a transmitter that transmits a laser signal to the target at a first time point;
• a receiver that receives a reflected laser signal reflected by the target;
• an analog-to-digital converter that samples the reflected laser signal and generates a digital signal by sampling the received reflected laser signal and creating a plurality of different non-zero magnitude values that are each associated with a time for the received reflected signal and have a magnitude that corresponds to a magnitude of the received reflected laser signal at the associated time such that the generated digital signal has a waveform that is similar to a waveform of the received reflected laser signal;
• and
• a processing unit that calculates the distance between the laser range finding device and the target based on the generated digital signal.

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 at a first time point;
• receiving a reflected laser signal reflected by the target;
• generating a digital signal having a plurality of signal values by sampling the reflected laser signal, the signal values range from 0 to N where N is a positive integer greater than two;
• and
• calculating the distance between the laser range finding device and the target based on the generated digital signal.