Ship Dynamic Positioning Accuracy Assessment Under GNSS Deviation
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Solution Overview
Problem
Existing ship handling systems face deviations between target and measured positions due to external forces and limitations in satellite positioning system accuracy, making it challenging to maintain ships at fixed points accurately.
Innovation Solution
A ship handling device that calculates positioning accuracy and fixed-point deviation levels based on satellite positioning system reception states, determining a fixed-point maintaining accuracy level by comparing these levels and notifying operators, allowing for better assessment of the ship's absolute position relative to the target position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dynamic positioning control is performed using satellite positioning system, then the ship can be maintained at a fixed point, but measurement accuracy limitations cause deviation between target position and measured position
Solution Approach 1:
The system continuously monitors the deviation between target position and measured position, and uses this feedback to assess the fixed-point maintaining accuracy level. The notification means provides real-time feedback to operators about the accuracy level, enabling them to respond appropriately to maintain reliable positioning despite measurement limitations.
Solution Approach 2:
The patent introduces an intermediary assessment mechanism that calculates the fixed-point maintaining accuracy level based on both positioning accuracy level and fixed-point deviation amount level. This intermediary metric bridges the gap between raw measurement data and actionable information for operators, translating satellite positioning data into meaningful accuracy assessments.
2Ease of operation
If satellite positioning system is used for dynamic positioning control, then position information can be obtained, but external forces and measurement accuracy limitations cause deviation from target position
Solution Approach 1:
The notification means provides continuous feedback to operators about the fixed-point maintaining accuracy level, enabling them to monitor and respond to positioning accuracy issues while the system operates automatically. This feedback mechanism maintains ease of operation by automating the monitoring and assessment functions.
Solution Approach 2:
The system automatically calculates positioning accuracy level, fixed-point deviation amount level, and determines the fixed-point maintaining accuracy level without requiring manual intervention. The system serves itself by autonomously assessing its own positioning accuracy and notifying operators, reducing the operational burden while maintaining measurement awareness.
3Reliability
If deviation between target position and measured position occurs, then position accuracy deteriorates, but operators need timely information to respond to maintain safety
Solution Approach 1:
The notification means provides timely feedback to operators about the fixed-point maintaining accuracy level, ensuring they receive critical position accuracy information when deviations occur. This feedback loop prevents information loss by actively communicating accuracy status to operators who can then respond to maintain safety.
Solution Approach 2:
The system calculates and assesses the fixed-point maintaining accuracy level in advance before critical deviations occur, allowing operators to take preliminary actions to maintain safety. By continuously monitoring and assessing accuracy levels, the system prepares operators with advance warning of potential positioning issues.
Data Source
AI summary
A ship handling device executing dynamic positioning control with which the fixed-point maintaining accuracy including measurement accuracy of a satellite positioning system can be assessed. In this ship handling device for maintaining a ship body at a target position using a GNSS (Global Navigation Satellite System) device, a positioning accuracy level of the GNSS device is calculated based on a radio-wave reception state of the GNSS device, a fixed-point deviation amount level is calculated based on a fixed-point deviation amount calculated based on the target position and a measured position measured by the GNSS device, and a fixed-point maintaining accuracy level indicative of an assumed range of an absolute position of the ship body relative to the target position is determined with reference to the positioning accuracy level and the fixed-point deviation amount level.