Distance Based Position Sensing Using Trilateration
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Solution Overview
Problem
Existing position measurement systems in construction are complex, expensive, and require two operators to accurately map the position of building features like plumbing sleeves, leading to costly reworking due to deviations from initial blueprints.
Innovation Solution
A distance-based measuring system using a position calculation unit (PCU) with a laser distance meter (LDM) and trilateration, which calculates two-dimensional positions without the need for angle sensors or leveling equipment, employing divergent laser beams and retro-reflective targets to simplify the measurement process and reduce operator requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional surveying equipment with angle sensors and leveling servos is used, then measurement precision is improved, but device complexity increases and requires two operators
Solution Approach 1:
The patent extracts and removes the angle sensor and leveling servo components from the measurement system. By using a distance-based approach with a laser distance meter and trilateration algorithm, the system eliminates the need for angle measurement capabilities, thereby simplifying the device while maintaining measurement precision through alternative mathematical calculation methods
Solution Approach 2:
The patent replaces the mechanical angle sensing system and leveling servos with an optical distance measurement system. Instead of using mechanical components to measure angles and maintain level, the system uses a laser distance meter combined with trilateration mathematics to calculate positions, substituting mechanical measurement with optical measurement and computational geometry
2Measurement precision
If traditional surveying equipment is used, then measurement precision is improved, but ease of operation deteriorates due to requiring two operators
Solution Approach 1:
The system performs self-leveling and self-positioning calculations automatically through the trilateration algorithm. The laser distance meter automatically calculates the position of construction features relative to the blueprint coordinate system without requiring manual angle measurements or leveling adjustments by operators, making the system easier to operate while maintaining precision
Solution Approach 2:
The patent replaces the manual mechanical operation of two-person surveying teams with an automated optical measurement system. The single operator simply positions the laser distance meter, and the system automatically performs all measurements and calculations, eliminating the need for coordinated two-person operation while preserving measurement accuracy
3Measurement precision
If complex angle measurements and leveling servos are used, then measurement precision is improved, but productivity decreases due to time-consuming operations
Solution Approach 1:
By removing the angle measurement and leveling servo functions from the system, the patent eliminates the time-consuming operations associated with these complex measurement processes. The distance-based approach with automatic trilateration calculation streamlines the workflow, improving productivity while maintaining the ability to achieve precise position measurements
Solution Approach 2:
The patent substitutes the time-intensive mechanical angle measurement and manual leveling processes with rapid optical distance measurement and automated computational geometry. The laser distance meter quickly obtains distance data, and the trilateration algorithm automatically calculates positions, significantly reducing the time required for mapping operations compared to traditional methods
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 solution allows for accurate, efficient, and cost-effective mapping of construction features with a single operator, reducing errors and reworking costs by eliminating the need for complex angle measurements and leveling servos, and enabling precise alignment of construction elements.
Implementation Method 1
An LDM typically includes a laser source such as a laser diode and light collection optics
Implementation Method 2
The light collection optics sense light from the laser source reflecting back to the LDM from a feature of interest
Implementation Method 3
Phase lag time and time of flight are two methods used by LDMs to determine the distance based on the reflected light
Data Source
AI summary
Systems, methods, and other embodiments associated with distance based position measurement are described. In one embodiment, an apparatus is configured to be positioned proximate a feature of interest. The apparatus includes a laser distance meter (LDM) configured to emit a laser beam and to determine first and second distances between the LDM and first and second targets. The first and second targets have known positions in three dimensions with respect to a reference plane from which the LDM is located. The apparatus also includes a trilateration unit configured to compute a two dimensional position of the LDM relative to the targets based, at least in part, on the first and second distances.