LiDAR Object Detector Threshold Adjustment for Long-Range Accuracy
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Solution Overview
Problem
Scanning LiDARs face challenges in accurately detecting objects at long ranges due to reduced detectable range and increased noise, leading to detection errors, as the threshold voltage needed to prevent errors is excessively high, limiting the detection distance and increasing costs with analog-to-digital conversion and variable gain amplifiers.
Innovation Solution
An object detector system that adjusts threshold voltage based on light utilization efficiency and noise levels across different detection areas, using a voltage adjuster to optimize detection sensitivity and range without increasing circuit size or cost, employing a configuration that reduces light utilization efficiency at the edges to prevent erroneous detections while maintaining long-range detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threshold voltage is increased to prevent detection errors, then the reliability of object detection is improved, but the detection distance is reduced
Solution Approach 1:
The detection range is divided into multiple detection areas with different noise characteristics. Each detection area has its own optimized threshold voltage value, allowing the system to achieve high detection accuracy in each area without requiring an excessively high global threshold that would limit detection distance.
Solution Approach 2:
Different threshold voltage values are applied to different detection areas based on their specific noise levels. Areas with higher noise have higher thresholds, while areas with lower noise have lower thresholds, optimizing both reliability and detection distance for each local region.
2Measurement precision
If analog-to-digital conversion and variable gain amplifiers are used to improve detection accuracy, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The system optimizes detection accuracy by adjusting the threshold voltage parameter rather than adding complex analog-to-digital conversion circuits or variable gain amplifiers. This parameter-based approach achieves improved measurement precision while maintaining simple circuit architecture and low cost.
Solution Approach 2:
The invention replaces expensive and complex circuit components with a simple threshold voltage adjustment mechanism, achieving the same functional improvement at lower cost and with simpler, more reliable hardware.
3Reliability
If the light utilization efficiency is increased to improve detection sensitivity, then the detection range is extended, but erroneous detections increase due to noise
Solution Approach 1:
The detection range is segmented into multiple areas, each with optimized threshold settings that account for local noise characteristics. This allows the system to maintain high detection sensitivity in each area while filtering out noise through area-specific threshold optimization.
Solution Approach 2:
Each detection area has locally optimized threshold voltage values that balance sensitivity and noise rejection. This local optimization prevents erroneous detections in high-noise areas while maintaining high sensitivity in low-noise areas, overall extending reliable detection range.
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 system effectively extends the detection range while preventing erroneous detections and reducing the size and cost of the circuit, maintaining high accuracy and reliability in object detection across varying light conditions.
Implementation Method 1
The light detector receives the light emitted from the light-emitting system and reflected by the object, and output a signal
Data Source
AI summary
An object detector including a light-emitting system to emit light to an object, a light detector, a signal detector, and a threshold adjuster. The light detector receives the light emitted from the light-emitting system and reflected by the object, and output a signal. The signal detector detects the signal output from the light detector based on a threshold value of voltage. The threshold adjuster changes the threshold value between when the light-emitting system emits light to a part of a light-emission range of the light-emitting system and when the light-emitting system emits light to other part of the light-emission range other than the part of the light-emission range.