LiDAR Light Receiver Crosstalk Removal via Temporal Segmentation
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Solution Overview
Problem
LiDAR devices face errors in distance and shape analysis due to crosstalk between light detection elements, which occur when one element receives light intended for another, leading to inaccurate position and shape data.
Innovation Solution
A LiDAR device with a light receiver that includes multiple light detection elements and a processor to identify and remove crosstalk by determining the removal start time point and masking pulses within a predetermined width, ensuring accurate detection information is used for distance and shape analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light detection elements are used to receive light from multiple light sources, then image resolution is improved, but crosstalk occurs between detection elements leading to measurement errors
Solution Approach 1:
The patent divides the detection process into distinct time segments by sequentially activating different light sources. Each light source is turned on in a specific time slot, and the corresponding detection element detects light only during its designated time window. This temporal segmentation prevents crosstalk by ensuring that detection elements do not simultaneously receive light from multiple sources, thereby maintaining both high image resolution and measurement accuracy.
2Adaptability or versatility
If light detection elements receive light from multiple light sources, then detection coverage is improved, but ToF calculation errors occur due to crosstalk
Solution Approach 1:
The patent implements periodic action by cycling through multiple light sources in a repeating sequence. Each light source is activated in turn during its designated time slot within the periodic cycle, and detection elements correspondingly detect light during their assigned time windows. This periodic temporal modulation allows the system to maintain broad detection coverage across multiple light sources while preventing ToF calculation errors by ensuring that each detection event is temporally associated with the correct light source.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively removes crosstalk, enhancing the accuracy of LiDAR devices in determining object positions and shapes by isolating and correcting interference between light detection elements, thereby improving image resolution and reducing errors.
Implementation Method 1
LiDAR devices use the time of flight (ToF) of light as the basic operation principle. For example, a LiDAR device may transmit light toward an object, receive the light through a sensor, and measure the ToF using a high speed electric circuit.
Implementation Method 2
a first light detection element configured to receive a first reflected light reflected from the object that is irradiated with a first light emitted by a first light source
Data Source
AI summary
Provided is a light detection and ranging (LiDAR) device including a light transmitter including a plurality of light sources, each of the plurality of light sources being configured to emit light toward an object, a light receiver including a plurality of light detection elements, each of the plurality of light detection elements being configured to detect reflected light reflected from the object that is irradiated with the light emitted by the plurality of light sources, and the light receiver being configured to remove crosstalk from second detection information output by at least one light detection element of the plurality of light detection elements based on first detection information output by any one of remaining light detection elements of the plurality of light detection elements, and a processor configured to obtain information on the object based on the second detection information with the crosstalk removed.