LiDAR Pulse Coding With Adaptive Energy Allocation for Long-Range Sensing
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Solution Overview
Problem
LiDAR systems face challenges in long-range detection performance due to safety constraints for human eye exposure, which limit the energy of each laser pulse and result in crosstalk interference among multiple LiDARs operating simultaneously, affecting the quality of point cloud data.
Innovation Solution
A control method for LiDAR that dynamically adjusts the energy allocation of laser pulses based on echo information, prioritizing long-range detection by increasing the energy of long-range detection pulses while decreasing that of short-range detection pulses, ensuring the total energy remains below safety thresholds for human eye exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the energy of each laser pulse is increased to improve long-range detection performance, then the detection range and precision are improved, but the safety threshold for human eye exposure is exceeded
Solution Approach 1:
The patent applies periodic pulse transmission with coding sequences, where multiple low-energy pulses are transmitted in a coded pattern rather than a single high-energy pulse. This periodic action allows the system to accumulate detection capability over multiple pulses while keeping each individual pulse below the safety threshold for human eye exposure.
Solution Approach 2:
The patent dynamically adjusts the energy allocation among multiple pulses based on detection requirements and safety constraints. By making the energy distribution flexible and adaptive rather than fixed, the system can optimize long-range detection performance while ensuring that no single pulse exceeds safety limits.
2Reliability
If multi-pulse coding is adopted to identify echo signals and reduce crosstalk, then anti-interference performance is improved, but the long-range detection performance is degraded due to energy distribution across multiple pulses
Solution Approach 1:
The patent changes the energy parameter distribution across multiple coded pulses, allocating different energy levels to different pulses in the coding sequence. This allows the system to maintain sufficient total energy for long-range detection while using the coding structure to identify and eliminate crosstalk through pattern recognition.
Solution Approach 2:
The patent performs preliminary energy allocation and pulse coding design before transmission, pre-configuring the pulse sequence to maximize both anti-crosstalk capability and long-range detection performance. By planning the energy distribution in advance based on expected detection scenarios, the system optimizes the trade-off between reliability and measurement precision.
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 approach enhances long-range detection precision and anti-crosstalk performance while maintaining safety standards, optimizing the use of laser pulse energy to improve detection capabilities without compromising safety.
Implementation Method 1
A LiDAR is used for ranging typically based on the method of direct time-of-flight (TOF), which performs ranging by transmitting a laser pulse narrow in bandwidth but high in peak power and measuring the TOF of the laser pulse between the LiDAR and a target object
Implementation Method 2
receiving echo information of the plurality of laser pulses reflected by the target object
Data Source
AI summary
The present disclosure provides a control method for a LiDAR, comprising: S101: transmitting a laser pulse signal based on a pulse coding and a current energy allocation scheme to detect a target object, the laser pulse signal comprising a plurality of laser pulses adopting the pulse coding; S102: receiving echo information of the plurality of laser pulses reflected by the target object; and S103: updating, based on the echo information of the target object, the energy allocation scheme adopted by the LiDAR for the next transmission. A preferred embodiment of the present disclosure not only satisfies the anti-crosstalk demand within a short range, but also improves the detection precision and detection performance within a long range, and a maximally beneficial application of laser pulse energy is obtained while safety requirements for human eye are met.