Vehicle LiDAR Detection System Using Rotating Wedge Mirrors
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Solution Overview
Problem
Vehicle detection systems face challenges in achieving a wide field of view with long range and high resolution while being cost-effective and simple to control, due to the complexity and cost of moving components like LiDAR systems.
Innovation Solution
A detection system using rotating wedge mirrors and a reflective member to scan in azimuth and elevation directions, with multiple LiDAR systems interacting with a shared reflective member, allowing for a large field of view without the need for complex moving parts or additional expensive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple LiDAR subassemblies are used to increase field of view, then detection coverage is improved, but system cost and complexity increase
Solution Approach 1:
The patent employs a rotating reflective member that dynamically changes the field of view direction while using a single fixed LiDAR subassembly. This dynamic mechanism allows one component to perform the function of multiple fixed components would provide, thereby expanding detection coverage without proportionally increasing system complexity
Solution Approach 2:
The single LiDAR subassembly serves multiple functions by combining it with the rotating reflective member. The system can scan multiple directions and cover a wide field of view using one transmitter and receiver unit, making the LiDAR component universal rather than requiring dedicated units for each detection zone
2Area of stationary object
If moving components are added to scan larger area, then field of view is increased, but precision and control difficulty worsen
Solution Approach 1:
The rotating reflective member provides a simple dynamic motion (single-axis rotation) that is easier to control and manufacture with high precision compared to complex multi-directional oscillating mechanisms. The rotational motion is well-understood and can be implemented with standard motors and encoders, achieving the desired scanning precision
3Adaptability or versatility
If oscillating components move in multiple directions, then scanning capability is improved, but actuator complexity and control difficulty increase
Solution Approach 1:
Instead of using complex multi-directional oscillating components with multiple actuators, the patent employs a single rotating reflective member that sweeps the field of view through simple rotational motion. This dynamic approach achieves comprehensive scanning capability while minimizing actuator complexity to a single rotation motor
Solution Approach 2:
The single rotating reflective member performs the scanning function that would otherwise require multiple oscillating components. By making this one component universal and capable of covering all necessary detection zones through rotation, the system eliminates the need for multiple specialized actuators
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 scans a large and precise field of view with reduced complexity and cost, achieving good resolution and reliability in object detection, particularly in vehicle environments.
Implementation Method 1
Each subassembly typically includes costly components, such as light transmitters and receivers, which are relied upon to generate data related to the location of objects in the surrounding environment
Implementation Method 2
A detection system using rotating wedge mirrors and a reflective member to scan in azimuth and elevation directions
Data Source
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AI summary
A detection system for a vehicle in an environment includes a reflective member configured to rotate about a first axis, the reflective member having a plurality of reflective sides. The detection system has a LiDAR system with at least one light transmitter and at least one light receiver. A wedge mirror deflects light between the LiDAR system and the reflective member to change the field of view of the LiDAR system in an elevation direction and in an azimuth direction. The reflective member is positioned such that rotation of the reflective member changes the field of view of the LiDAR system in an azimuth direction.