Dynamic Receiver Gain Control for LiDAR Saturation
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Solution Overview
Problem
Conventional LiDAR systems use a constant receiver gain, leading to saturation issues when detecting laser beams reflected from shorter distances, which impairs measurement accuracy and causes overheating and instability.
Innovation Solution
Implementing a dynamic receiver gain control system that adjusts the detector gain based on the detection distance and vertical detection angle, using a controller and a look-up table to determine target gains proportional to the square of detection distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant receiver gain is used in LiDAR systems, then the device complexity is reduced and ease of operation is improved, but receiver saturation occurs when detecting laser beams from shorter distances, impairing measurement precision and causing thermal instability
Solution Approach 1:
The patent implements dynamic receiver gain control by adjusting the detector gain based on the vertical detection angle. The controller receives the vertical detection angle from the scanner and dynamically adjusts the detector gain accordingly, transforming the static constant gain system into a dynamic adaptive system that prevents saturation while maintaining measurement precision across different detection angles
Solution Approach 2:
The patent changes the gain parameter of the detector based on the vertical detection angle. By establishing a relationship between the detection angle and optimal gain value, the system adjusts the detector gain parameter dynamically to match the expected signal strength at different angles, preventing saturation from strong returns while maintaining sensitivity for weak returns
2Reliability
If a constant receiver gain is used, then the device complexity remains low, but receiver saturation causes harmful thermal effects and instability
Solution Approach 1:
The system dynamically adjusts the detector gain based on real-time vertical detection angle information from the scanner. This dynamic adaptation prevents receiver saturation that would cause thermal overload and instability, thereby improving reliability without requiring complex additional hardware beyond the controller software
Solution Approach 2:
The controller receives feedback about the vertical detection angle from the scanner and uses this information to adjust the detector gain accordingly. This feedback loop ensures the receiver operates within optimal parameters, preventing saturation and thermal issues while maintaining simple hardware architecture
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
This solution prevents receiver saturation, enhances measurement accuracy, and improves thermal efficiency by dynamically adjusting the receiver gain according to changing detection distances and angles.
Implementation Method 1
a detector configured to detect the light beams returned by the object
Data Source
AI summary
Embodiments of the disclosure provide an optical sensing system, a method for controlling a receiver gain in the optical sensing system, and a receiver in the optical sensing system. The exemplary optical sensing system includes a transmitter configured to emit light beams at a plurality of vertical detection angles to scan an object. The optical sensing system further includes a receiver having a detector configured to detect the light beams returned by the object. The optical sensing system also includes a controller configured to dynamically vary a gain of the detector for detecting the light beams of the respective vertical detection angles.