LIDAR Timing Synchronization via Universal Clock
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Solution Overview
Problem
The proliferation of LIDAR systems operating in close proximity increases the likelihood of interference among them, leading to errors in distance measurements due to misinterpreted laser pulses.
Innovation Solution
Implementing timing synchronization among LIDAR systems by using a universal clock signal, such as GPS, to coordinate the firing times of laser pulses, minimizing interference by ensuring all systems fire at synchronized times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple LIDAR systems operate in close proximity, then the coverage area and operational capability increase, but interference between systems occurs leading to measurement errors
Solution Approach 1:
The patent implements periodic time-division multiplexing where multiple LIDAR systems transmit laser pulses in alternating time slots synchronized to a common clock signal. Each system transmits during its assigned time window and receives during others' windows, converting simultaneous continuous operation into periodic alternating operation to eliminate interference while maintaining full coverage area
Solution Approach 2:
The patent introduces a universal synchronized clock signal as an intermediary that coordinates the operation of multiple independent LIDAR systems. This external timing reference acts as a mediator that allocates transmission time slots to different systems, enabling them to share the operational space without direct interference while maintaining individual measurement accuracy
2Productivity
If multiple LIDAR systems transmit simultaneously, then operational efficiency increases, but jamming and interfering signals increase
Solution Approach 1:
The system maintains high operational efficiency by implementing periodic time-division multiplexing where each LIDAR system transmits during its assigned time slot and receives during others' slots. This periodic alternating operation eliminates simultaneous transmission interference while ensuring each system operates continuously at full efficiency without idle waiting time
Solution Approach 2:
The patent applies preliminary action by pre-assigning specific time slots to each LIDAR system based on their operational priorities and requirements. This advance scheduling of transmission windows prevents interference before it occurs, allowing systems to operate efficiently in predetermined sequences rather than reacting to interference after it happens
Data Source
AI summary
An example method for use with a LIDAR system includes assigning a firing time of a laser included in the LIDAR system. The assignment of the firing time includes: (i) receiving a universal clock signal at the LIDAR system, where the universal clock signal common to one or more other LIDAR systems; (ii) synchronizing a system clock of the LIDAR system to the universal clock signal to generate a synchronized clock signal; and determining the firing time based on the synchronized clock signal to reduce interference with the one or more other LIDAR systems. The method also includes firing the laser at the firing time.