LiDAR Side-Lobe Signal Correction for Accurate ToF Measurement
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Solution Overview
Problem
Existing LiDAR devices face challenges in accurately processing depth images due to side lobes in the radiation pattern, which distort distance measurements.
Innovation Solution
A method and device for LiDAR that corrects sub-receiving signals based on the intensity ratio and angle of side lobes relative to main lobes, using a processor to synchronize and correlate receiving signals to determine the time of flight (ToF) of laser pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If side lobes are present in the radiation pattern, then the LiDAR device can cover a wider angular range, but the measurement precision deteriorates due to distortion in distance measurements
Solution Approach 1:
The patent extracts and separates the side lobe signals from the main receiving signals through signal processing. By identifying and isolating side lobe components, the system removes their distorting influence on distance measurements while preserving the angular coverage benefits of the radiation pattern.
Solution Approach 2:
The system uses feedback by comparing received signals with reference signals and adjusting measurements based on detected side lobe patterns. The correction process continuously refines distance measurements by compensating for side lobe effects, maintaining accuracy across the full angular range.
2Measurement precision
If advanced signal processing is implemented to correct side lobe effects, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-processing receiving signals to identify and flag potential side lobe components before final distance calculation. This early detection and marking system simplifies subsequent processing by pre-organizing data that requires correction, reducing overall computational complexity.
Solution Approach 2:
The system changes parameters by adjusting signal amplitude values based on detected side lobe characteristics. By modifying signal parameters (amplitude, timing) according to side lobe identification, the system achieves accurate measurements through relatively simple parameter adjustments rather than complex algorithmic processing.
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
Enhances the accuracy of distance measurements by mitigating the distortion caused by side lobes, ensuring precise depth image processing.
Implementation Method 1
The LiDAR device uses a method of measuring a time of flight (ToF) of light as a basic operation principle
Implementation Method 2
the LiDAR device may radiate light toward an object and receive the light through a sensor
Data Source
AI summary
A method of operating a light detection and ranging (LiDAR) device includes obtaining receiving signals corresponding to reference laser pulses generated from a reference signal; obtaining a main receiving signal having a maximum value among the receiving signals with respect to a time point; correcting a value of a sub-receiving signal included in the receiving signals at the time point based on the maximum value of the main receiving signal; and obtaining a time of flight (ToF) of a laser pulse corresponding to the sub-receiving signal based on a correlation between the corrected value of the sub-receiving signal and the reference signal.