Surveying Target Unit With Encoder Pattern For Angle Determination
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Solution Overview
Problem
Conventional surveying methods using ground-installed scanners require time-consuming target scanning and can be cumbersome, especially in environments with obstructed vision, as they necessitate the installation and scanning of multiple known points and backsight points, limiting flexibility and increasing operation time.
Innovation Solution
A surveying system incorporating a target unit with an encoder pattern and a scanner device that shares a central axis vertically, allowing for the calculation of direction angles and coordinates without the need for extensive target scanning of known or backsight points, using a leveling base to adjust for offset angles and enable efficient data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional surveying methods (backward intersection or backsight-point-and-instrument-point) are used to determine new observation points, then measurement precision and reliability are improved, but the time required for target scanning and operation increases significantly
Solution Approach 1:
The invention extracts the essential function of coordinate determination from the time-consuming target scanning process. By using an encoder pattern that directly encodes angular position information, the system obtains direction angles immediately from the encoder reading without requiring multiple target scans, thus extracting only the necessary measurement function while eliminating redundant operations.
Solution Approach 2:
The encoder pattern is pre-configured with angular position information before the surveying operation begins. This preliminary encoding of directional data allows the system to determine orientation and coordinates directly from the encoder reading, eliminating the need for time-consuming target scanning and calculation procedures that would otherwise be required to establish the same information.
2Reliability
If multiple known points and backsight points are installed and scanned to determine new observation points, then measurement reliability is improved, but the complexity of the surveying operation increases
Solution Approach 1:
The invention extracts the essential orienting function from the complex multi-point surveying procedure. By using the encoder pattern attached to the single known point, the system obtains direction angle information directly without requiring the installation and scanning of multiple known points and backsight points, thus simplifying the operational procedure while maintaining measurement reliability.
Solution Approach 2:
Instead of using multiple known points to determine the position of a new point through complex intersection calculations, the invention inverts the approach by using the encoder pattern on a single known point to directly provide the directional information needed for coordinate determination, thereby simplifying the procedure from a multi-point system to a single-point system.
3Measurement precision
If conventional target scanning methods are used to measure known points, then measurement precision is maintained, but the productivity of the surveying operation decreases
Solution Approach 1:
The invention replaces the mechanical target scanning system with an optical/electronic encoder reading system. Instead of using the laser scanner to physically scan and measure the position of targets at known points, the system uses an encoder pattern that optically encodes angular position information, allowing the scanner to read the direction angle directly without mechanical scanning measurements, thereby maintaining precision while dramatically improving productivity.
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 configuration allows for the determination of new points without performing measurements on known or backsight points, reducing the overall time required for survey operations and improving efficiency, especially in environments with poor visibility.
Implementation Method 1
an encoder pattern reading unit configured to optically read the encoder pattern
Implementation Method 2
a distance measuring unit configured to perform a distance measurement by transmitting distance measuring light and receiving reflected light
Data Source
AI summary
A surveying system includes a target unit having a reflection target and an encoder pattern showing an angle of the target unit; a scanner configured to acquire three-dimensional point cloud data, measured coordinates of the target, and optically read the encoder pattern to acquire an encoder pattern read angle; and a leveling base configured to selectively allow either of the target unit and the scanner to be removably mounted. The scanner calculates a direction angle of the leveling base based on the encoder pattern read angle and the offset angle of the target unit, calculates coordinates of an installation point of the target unit based on the measured coordinates of the target and the direction angle of the target, and calculates a direction angle of the scanner based on the offset angle of the scanner and the direction angle of the leveling base on which the scanner is mounted.