SiPM Receiver Threshold Control for LiDAR Noise Filtering
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Solution Overview
Problem
Laser radars face challenges in accurately distinguishing between echo signals and background noise due to varying noise floor levels caused by different weather conditions and target reflectivities, which affects ranging performance.
Innovation Solution
A method for dynamically adjusting the threshold of a silicon photomultiplier (SiPM) receiver by measuring incident light intensity and adjusting the threshold based on the intensity to filter out noise, and a laser radar system incorporating multiple SiPM receivers with a control unit to optimize threshold settings for improved signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold is used in SiPM receiver, then the device complexity is low, but the measurement precision deteriorates due to varying noise floor levels
Solution Approach 1:
The patent implements dynamic threshold adjustment by continuously monitoring the noise floor level and adapting the threshold accordingly. The threshold is no longer fixed but varies dynamically based on environmental conditions, allowing the system to maintain optimal signal-to-noise ratio across different operating scenarios without requiring complex manual intervention.
Solution Approach 2:
The system employs feedback mechanisms where the detected noise floor level is fed back to the threshold adjustment module. This closed-loop control allows the threshold to automatically adapt to changing environmental conditions, ensuring consistent measurement precision while avoiding the need for complex external calibration equipment.
2Measurement precision
If multiple laser beams are used to increase vertical field of view, then the angular resolution is improved, but the difficulty of detecting and measuring increases due to higher noise levels
Solution Approach 1:
The patent divides the detection process into multiple channels, each with its own threshold adjustment mechanism. By segmenting the noise measurement and threshold control for each laser beam channel, the system can independently optimize detection parameters for each beam, reducing the overall difficulty of detecting and measuring noise across multiple channels while maintaining high angular resolution.
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 and reliability of laser radar ranging by effectively filtering noise and forming a gray scale image for improved detection, adapting to varying environmental conditions.
Implementation Method 1
an emitter of the laser radar emits a laser beam, and the laser beam returns to a laser receiver due to backscattering after it encounters an object
Data Source
AI summary
Disclosed is a method for dynamically adjusting a threshold of a silicon photomultiplier (SiPM) receiver. The method includes: receiving incident light by a SiPM receiver (S101); obtaining an intensity of the incident light (S102); and adjusting a threshold of the SiPM receiver according to the intensity of the incident light (S103).