Lidar device using time-delayed local oscillator light and method of operation thereof

By using time-delayed local oscillator light (LO light) interferometry and a high-pass filter, the challenges of noise suppression and cost control in LiDAR devices have been solved, enabling high-precision and low-cost distance measurement.

CN114114302BActive Publication Date: 2026-07-07SAMSUNG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Filing Date
2021-02-23
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing LiDAR devices using Time-of-Flight (ToF) and FMCW methods face challenges in noise suppression and cost control, making it difficult to achieve high-precision and low-cost distance measurements.

Method used

Distance measurement is performed using time-delayed local oscillator light (LO light). The distance is determined by interfering continuous wave light and time-delayed LO light, combined with a high-pass filter and a processor, thus avoiding dependence on broadband receivers and high frequency accuracy.

Benefits of technology

It enables high-precision distance measurement in the time domain, reduces equipment costs, simplifies signal processing, and reduces the need for complex frequency domain analysis.

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Abstract

A light detection and ranging (LiDAR) device includes a transmitter configured to emit continuous wave light to an object and to provide a local oscillator (LO) light corresponding to the emitted continuous wave light, a delay circuit configured to time 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.
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