Variable Phase Scanning Lidar Interference Mitigation
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Solution Overview
Problem
Scanning LIDAR systems face measurement errors due to ambient light and other sources of pulsed laser light, which can cause interference and affect accuracy.
Innovation Solution
A variable phase scanning LIDAR system that emits a pulsed fanned laser beam, using a control circuit to synchronize transmit and receive modules and inject phase offsets to avoid interference, ensuring accurate distance measurements by minimizing spatiotemporal overlap with other light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning LIDAR system uses fixed phase scanning trajectory, then system operation is simple, but measurement precision deteriorates due to interference from ambient light and other LIDAR systems
Solution Approach 1:
The patent applies dynamics by making the scanning phase variable rather than fixed. The control circuit dynamically adjusts the scanning phase based on detected interference conditions, allowing the system to adapt its trajectory timing to avoid conflicts with ambient light and other LIDAR systems while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent changes the temporal parameter of the scanning trajectory by introducing variable phase offsets. By modifying when scans occur in time (phase timing) rather than changing the physical scanning path, the system achieves interference avoidance while keeping the spatial scanning pattern intact, thus resolving the contradiction between precision and complexity.
2Productivity
If scanning LIDAR system operates continuously, then productivity is high, but harmful factors increase due to cumulative interference from multiple light sources
Solution Approach 1:
The patent uses periodic action by implementing phase modulation in the continuous scanning operation. The system maintains continuous productivity through uninterrupted scanning while periodically varying the phase timing to create temporal windows that avoid interference from ambient light and other periodic LIDAR sources, thus reducing cumulative harmful effects.
Solution Approach 2:
This principle is not applicable to this patent as it deals with optical and electronic systems rather than pneumatic or hydraulic mechanisms.
3Reliability
If scanning LIDAR system uses standard fixed trajectory, then ease of operation is high, but reliability deteriorates due to measurement errors from light interference
Solution Approach 1:
The patent implements self-service by enabling the LIDAR system to automatically detect interference conditions and adjust its own scanning phase without external intervention. The control circuit monitors for interference and autonomously modifies the scanning trajectory timing, thereby improving reliability while maintaining ease of operation through self-adjustment rather than requiring complex manual control.
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 achieves significant ambient light noise immunity and accurate distance measurements by dynamically adjusting the phase of the scanning trajectory, reducing errors caused by external light sources.
Implementation Method 1
measuring a time-of-flight of a reflected light pulse to determine a distance to the measurement point
Implementation Method 2
emits a pulsed fanned laser beam
Data Source
AI summary
A light detection and ranging system includes synchronously scanning transmit and receive mirrors that scan a pulsed fanned laser beam in two dimensions. Imaging optics image a receive aperture onto an arrayed receiver that includes a plurality of light sensitive devices. A phase offset may be injected into a scanning trajectory to mitigate effects of interfering light sources.