LiDAR Emission Power Configuration for Signal Saturation Control
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Solution Overview
Problem
LiDAR systems face challenges in achieving accurate measurement results due to factors influencing the waveform of echo signals, such as over-saturation or weak waveforms, which can lead to inaccurate distance, orientation, and reflectivity measurements.
Innovation Solution
A method is introduced to configure the emission power of LiDAR based on the measurement range and the strength of the echo signals, allowing for multiple levels of emission power to be set. This approach ensures that echo signals are within a suitable range, preventing over-saturation and ensuring accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the emission power of LiDAR is increased to extend measurement range, then the measurement range is improved, but the echo signal may become over-saturated leading to inaccurate measurements
Solution Approach 1:
The patent implements dynamic emission power adjustment by establishing a correspondence relationship between measurement ranges and emission power levels. The system automatically selects appropriate emission power from multiple preset levels based on the detected measurement range, allowing the emission power to dynamically adapt rather than remaining fixed. This resolves the contradiction by enabling extended measurement range through higher power when needed while preventing over-saturation by using lower power for closer targets.
Solution Approach 2:
The patent changes the emission power parameter based on the measurement range parameter. By establishing a correspondence relationship between different measurement ranges and emission power levels, the system adjusts the emission power parameter to match the detected range, ensuring optimal signal strength without over-saturation. This parameter adjustment resolves the technical contradiction between extending measurement range and maintaining measurement accuracy.
2Measurement precision
If the emission power of LiDAR is decreased to prevent over-saturation, then the measurement accuracy is improved, but the measurement range is limited
Solution Approach 1:
The system dynamically adjusts emission power based on the measurement range detected by the emitting unit. When closer targets are detected, the system uses lower emission power to avoid over-saturation and maintain accuracy. When farther targets are detected, the system automatically switches to higher emission power to extend the measurement range. This dynamic adjustment resolves the contradiction between measurement accuracy and measurement range.
Solution Approach 2:
The patent implements parameter change by establishing a correspondence relationship between measurement ranges and emission power levels. The emission power parameter is changed according to the detected measurement range, allowing the system to optimize both accuracy and range. This resolves the technical contradiction by enabling the system to achieve high accuracy at close ranges while maintaining extended range capability through appropriate power adjustment.
3Measurement precision
If multiple levels of emission power are used to optimize measurement accuracy, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the emission power into multiple discrete levels (e.g., first emission power level and second emission power level) corresponding to different measurement ranges. Each level is preset and associated with specific range conditions. This segmentation simplifies the control logic compared to continuous adjustment, as the system only needs to select between predefined levels rather than continuously tune the power, thereby reducing overall system complexity while maintaining high measurement accuracy.
Solution Approach 2:
The patent uses parameter change by establishing discrete emission power levels that correspond to different measurement ranges. Instead of requiring complex continuous control mechanisms, the system adjusts the emission power parameter by selecting from predefined levels. This approach maintains measurement accuracy while avoiding the complexity of continuous power adjustment systems.
4Measurement precision
If the emission power is adjusted based on echo signal strength to prevent over-saturation, then the measurement accuracy is improved, but the response time increases due to additional processing
Solution Approach 1:
The patent implements preliminary action by pre-establishing the correspondence relationship between measurement ranges and emission power levels before actual measurement occurs. The system detects the measurement range and automatically selects the appropriate emission power level in advance, rather than adjusting power after receiving echo signals. This preliminary configuration reduces real-time processing delays and maintains fast response time while ensuring measurement accuracy through appropriate power selection.
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 method improves the accuracy and range of LiDAR measurements by adjusting emission power according to the measurement range and echo signal strength, effectively addressing issues of over-saturation and weak signals.
Implementation Method 1
emitting a laser signal via the emitting unit based on the emission power, where the laser signal is used for measuring the target detection object
Implementation Method 2
comparing the received echo signal reflected back from the target detection object with the emitted laser signal
Data Source
AI summary
This application provides a method, device, and computer-readable storage medium for emitting laser signals. The method includes: setting the emission power of the emitting unit based on the measurement range of the LiDAR's emitting unit and/or the strength of the obtained echo signal corresponding to the emitting unit, where the emitting unit has at least two levels of emission power corresponding to different measurement ranges, and each level corresponds to a specific strength of emission power; emitting a laser signal via the emitting unit based on the emission power, where the laser signal is used for measuring the target detection object.