Patent ID: 8964169
Filing Date: 2015-02-24
Classification: G01B,G01S

Abstract:
1. A ranging method comprising the following steps: modulating a measured beam, by a modulated signal of which the frequency is continuously changed over time wherein a modulator facilitates the frequency of the measured beam to be continuously changed over time; emitting the modulated measured beam to a measured object with an emitting device; receiving the reflected measured beam with a receiving device, wherein the receiving device is an avalanche photodiode, and converting the beam into the measured signals; and comparing the frequency of the modulated signal generated when the measured beam is received with the frequency of the measured signals, wherein a frequency mixer compares the frequency of the modulated signal generated when the measured beam is received with the frequency of the measured signals, wherein the frequency mixer is integrated into the receiving device, and wherein the generated modulated signal is transmitted to the receiving device in real time by the modulator and implemented with minus average operation together with the measured signals, thus determining the measured distance, wherein a processor determines the measured distance according to the compared results.