Navigation Assistance Device for Ship Docking State Prediction
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Solution Overview
Problem
Conventional navigation assistance technologies struggle to accurately predict the state of a ship during docking, particularly in terms of linear contact with the quay.
Innovation Solution
A navigation assistance device equipped with a ship state detection sensor, a quay information detecting unit, a motion state calculating unit, a distance calculating unit, and an arrival state calculating unit, which calculates the predicted time of arrival, speed, and drift angle at the quay based on the ship's motion state and quay information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional navigation assistance technology is used, then the system structure is simple, but the measurement precision of ship state at docking point is insufficient
Solution Approach 1:
The system segments the navigation assistance function into separate modular units: ship state detection sensor, quay information detecting unit, motion state calculating unit, distance calculating unit, and arrival state calculating unit. Each unit performs a specific function, allowing high measurement precision for ship state at docking point while maintaining manageable system complexity through functional decomposition.
2Measurement precision
If more sensors and calculation units are added to improve measurement precision, then the device complexity increases
Solution Approach 1:
The arrival state calculating unit serves multiple functions: it calculates predicted time of arrival, predicted speed at arrival, and drift angle at arrival, all based on the same input parameters (quay direction velocity and distance). This multi-functionality approach improves measurement precision without proportionally increasing device complexity, as a single unit performs multiple critical calculations.
3Loss of information
If the system calculates detailed arrival state parameters, then the information accuracy improves, but the calculation time increases
Solution Approach 1:
The system performs preliminary calculations of motion state and distance continuously during the navigation approach, storing intermediate results (quay direction velocity and distance) that are directly used for arrival state prediction. This preliminary action ensures that when arrival state calculation is needed, the required data is already prepared, minimizing calculation time while maintaining high information accuracy.
Data Source
AI summary
A navigation assistance device includes a ship state detection sensor and processing circuitry. The sensor detects a ship position, a ship speed, and a bow azimuth. The processing circuitry detects a quay line of a quay where a ship is docked. The processing circuitry calculates a quay direction velocity based on the ship speed, bow azimuth, and quay line. The processing circuitry calculates a distance between the ship and the quay line based on the ship position and quay line. The processing circuitry calculates an arrival state including at least one of a predicted time of arrival at the quay of the ship, a predicted speed of the ship at arrival at the quay, and a drift angle of the ship at arrival at the quay, based on the quay direction velocity and the distance between the ship and the quay line.