| CPC G01S 7/4911 (2013.01) [G01S 17/32 (2013.01); G01S 17/931 (2020.01)] | 15 Claims |
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1. A light detection and ranging (LiDAR) device comprising:
a transmitter configured to transmit a continuous wave light to an object, and provide a local oscillator (LO) light corresponding to the transmitted continuous wave light;
a delay circuit configured to delay the LO light;
a receiver configured to receive the continuous wave light reflected from the object; and
a detection circuit configured to determine a distance from the LiDAR device to the object based on the time delayed LO light and the received continuous wave light,
wherein the detection circuit further comprises a mixer configured to output an interfered light by interfering the time delayed LO light with the received continuous wave light, a signal converter configured to output an electrical signal by photoelectrically converting the interfered light, and a processor configured to determine the distance from the LiDAR device to the object based on the electrical signal, and
wherein the processor is configured to generate a filtered signal by filtering the electrical signal via a high pass filter (HPF), obtain a time delay value of the time delayed LO light corresponding to a period in which the filtered signal is reduced to a predetermined value or a minimum value, and determine the distance from the LiDAR device to the object based on the obtained time delay value.
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