Frustum Radar Reflector for Tilt-Tolerant Elevator Positioning
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Solution Overview
Problem
Existing radar reflecting surfaces in elevator positioning systems suffer from mis-direction and low signal strength due to imperfections and material deformation, requiring precise installation and frequent calibration, which complicates accurate position determination of elevator cars.
Innovation Solution
A radar reflector with a pyramidal frustum volume formed by triangular panels, configured for approximately perpendicular panels to directly reflect radar signals back to the transceiver, maintaining signal strength even with minor tilts, and enabling improved detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional radar reflecting surfaces are used, then the system is simple to implement, but the signal strength is low and mis-direction occurs due to imperfections and material deformation
Solution Approach 1:
The radar reflector is divided into multiple triangular panels (at least three) that are arranged to form a pyramidal frustum structure. Each panel is independently positioned and oriented to contribute to the overall reflection function, allowing the system to maintain signal strength while accommodating some structural flexibility without compromising performance
Solution Approach 2:
The reflector uses a pyramidal frustum geometry with triangular panels that create a three-dimensional curved surface configuration. This geometric design enables the reflector to maintain proper signal reflection characteristics even when subjected to minor deformations or tilts, as the three-dimensional structure provides tolerance for dimensional variations
2Measurement precision
If traditional flat reflectors are used, then installation is simple, but frequent calibration is required due to mis-direction and low signal strength
Solution Approach 1:
The pyramidal frustum geometry with triangular panels creates a three-dimensional reflective surface that maintains proper radar signal reflection over a wider range of orientations and positions. This geometric design reduces sensitivity to installation errors and environmental deformations, thereby minimizing the need for frequent calibration while maintaining measurement precision
Solution Approach 2:
The triangular panel configuration creates an asymmetric pyramidal frustum structure that provides directional stability. The asymmetric geometry is specifically designed to reflect radar signals back toward the transceiver while being tolerant of minor tilts and position variations, reducing calibration requirements
3Reliability
If precise installation is required for traditional reflectors, then signal direction is accurate, but installation complexity and calibration frequency increase
Solution Approach 1:
The modular triangular panel design allows for easier assembly and installation compared to traditional monolithic reflectors. Each panel can be independently positioned and secured, making the installation process more manageable while maintaining the geometric precision needed for accurate signal reflection
Solution Approach 2:
The three-dimensional pyramidal frustum geometry provides inherent tolerance for installation variations. The curved surface configuration maintains effective radar signal reflection even when minor deviations from perfect alignment occur, reducing the stringency of installation precision requirements
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 radar reflector ensures reliable radar-based measurements with enhanced signal strength and accuracy, allowing precise elevator car positioning without the need for frequent calibration.
Implementation Method 1
the pyramidal frustum volume is configured to directly reflect radar signals originating from a radar transceiver back to the radar transceiver
Data Source
AI summary
Various embodiments are directed to a radar reflector configured for radar-based distance measurements for determining a position of an elevator car within an elevator shaft. The radar reflector comprises three or more triangular panels defining a pyramidal frustum volume having a base plane and an upper plane that are parallel. The pyramidal frustum volume is configured to directly reflect radar signals originating from a radar transceiver back to the radar transceiver based at least in part on the triangular panels being mutually perpendicular at a projected apex above the upper plane. The reflected radar signals reflected by the radar reflector have substantially parallel trajectories with the original, pre-reflected radar signals emitted by the radar transceiver. The triangular panels of the radar reflector being mutually perpendicular advantageously maintains direct reflection of radar signals in spite of any potential horizontal tilt of the radar reflector to a certain extent.