Boom Attitude Detection Using GPS Correction Tables
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional boom attitude detection methods for cranes using GPS are unreliable when GPS signals are interrupted, leading to inaccurate calculations and potential safety issues during crane operations.
Innovation Solution
A boom attitude detection apparatus that employs a GPS device with base and mobile station antennas, an attitude detector, and a load detector, utilizing a correction table to calculate and correct boom attitudes even in low GPS signal conditions, ensuring continuous and accurate attitude determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS device is used to calculate boom attitude, then positioning accuracy is improved, but reliability deteriorates when GPS signals are interrupted
Solution Approach 1:
The patent introduces a correction table as an intermediary data structure that stores pre-calculated correction values. When GPS signals are available, the system calculates accurate boom attitudes and stores correction values in the table. When GPS signals are interrupted, the system retrieves correction values from the table to maintain reliable boom attitude calculation, thus resolving the contradiction between GPS positioning accuracy and reliability during signal interruption.
Solution Approach 2:
The system performs preliminary calculations of correction values and stores them in the correction table during periods when GPS signals are available. This preliminary action ensures that when GPS signals are later interrupted, the pre-stored correction values can be immediately applied to maintain accurate and reliable boom attitude detection without interruption.
2Measurement precision
If correction values are updated frequently, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The correction table is designed to be dynamically updated based on GPS positioning reliability. When GPS signals are reliable, the system updates the correction table with newly calculated values. When GPS signals are unreliable, the system uses existing correction values without updating. This dynamic approach maintains measurement precision while avoiding unnecessary complexity from constant updates.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a boom attitude detection device capable of determining the attitude of a boom even if a GPS device is in poor radio reception conditions. The boom attitude detection device is equipped with: a GPS device (20) that measures the position of the leading end of the boom (13); attitude detectors (31) and (32) that detect the attitude of the boom (13); and a calculation device (40). If the positioning reliability of the GPS device (20) is high, the calculation device (40) determines a correction value for correcting detection values of the attitude detectors (31) and (32) to the attitude of the boom (13) determined from the positioning value of the GPS device (20). If the positioning reliability of the GPS device (20) is low, the calculation device (40) corrects the detection values of the attitude detectors (31) and (32) using correction values and determines the attitude of the boom (13). Even if the GPS device (20) is in poor radio reception conditions and the positioning reliability is low, the attitude of the boom (13) can be determined.