Surveying Instrument Error Detection and Correction
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Solution Overview
Problem
Construction machine control systems face challenges in maintaining high measurement accuracy of surveying instruments due to mechanical errors, which are difficult to detect and adjust in a timely and efficient manner, especially in field conditions.
Innovation Solution
A surveying instrument equipped with an angle measuring part, an error detecting part, and a correction processing part that automatically cancels mechanical errors from measured angles, allowing for precise measurement output without the need for frequent accuracy checks, and a method for the surveying instrument usage that includes detecting mechanical errors before establishing a relation with the construction machine to ensure accurate position information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement accuracy of the surveying instrument is increased to maintain finished surface height accuracy within several mm, then the measurement precision is improved, but the device complexity increases due to the need for mechanical error checking and adjustment mechanisms
Solution Approach 1:
The system performs mechanical error detection and correction automatically before actual measurement work begins. The error detecting part detects mechanical errors in advance, and the correction processing part pre-calculates correction values, so that when measurement is needed, the instrument is already adjusted and ready to provide accurate measurements without requiring manual intervention
Solution Approach 2:
The surveying instrument performs self-diagnosis and self-correction of mechanical errors. The error detecting part automatically detects mechanical errors within the instrument, and the correction processing part automatically applies correction values to measurement angles, eliminating the need for external checking and adjustment operations
2Measurement precision
If frequent checking and adjustment of mechanical errors is performed to maintain measurement accuracy, then the measurement precision is improved, but the loss of time increases due to the additional operational steps required
Solution Approach 1:
The error detection and correction operations run continuously or periodically in the background without interrupting the main measurement workflow. The system can detect errors and apply corrections automatically during instrument setup or between measurement tasks, ensuring measurement accuracy is maintained without requiring dedicated time for separate checking and adjustment procedures
Solution Approach 2:
The instrument automatically performs error detection and correction without requiring operator intervention, eliminating the time workers would spend on manual checking and adjustment tasks while maintaining measurement precision
3Ease of operation
If the surveying instrument automatically detects and corrects mechanical errors, then the ease of operation is improved, but the device complexity increases due to additional error detecting and correction processing components
Solution Approach 1:
The surveying instrument automatically detects and corrects its own mechanical errors without external intervention. The error detecting part monitors the instrument's mechanical state, and the correction processing part automatically applies correction values to measurement angles, making the instrument self-sufficient and eliminating the need for manual error checking and adjustment by operators
Solution Approach 2:
The system implements a feedback loop where the error detecting part continuously monitors mechanical errors and feeds this information to the correction processing part, which automatically adjusts measurement angles based on detected errors. This closed-loop control system maintains measurement accuracy automatically, simplifying operation despite the added internal complexity
Data Source
AI summary
It is premised that a surveying instrument at least includes an elevation angle measuring part 30 measuring an elevation angle relative to an object to be measured. Under this premise, the surveying instrument includes an error detecting part 35, 54, 55 detecting a vertical-axis error Δθ reflected in an elevation angle measured by the elevation angle measuring part 30 and a correction processing part 50 receiving an elevation angle measured by the elevation angle measuring part 30 and outputting as an elevation angle an angle acquired by cancelling the vertical-axis error Δθ detected by the error detecting part 35, 54, 55 form the elevation angle.