Ship Monitoring With Continuous OZT Collision-Risk Ranges
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Solution Overview
Problem
Existing ship collision risk evaluation techniques display multiple overlapping circular OZTs, leading to low legibility due to irregular edges and increased calculation load when determining points are spaced too closely or not displayed when spaced too far apart.
Innovation Solution
A ship monitoring system that calculates a risk value for each point on an estimated course, specifying a continuous range where risk values exceed a threshold and displays this range as a comprehensive OZT with linear edges along the estimated course, improving legibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple circular OZTs are displayed in an overlapped manner on estimated courses of other ships, then the collision risk evaluation is provided, but the legibility is low due to irregular edges and overlapping complexity
Solution Approach 1:
The patent merges multiple discrete circular OZT indicators into a single continuous risk range display. Instead of showing separate circular OZTs for different time points that overlap and create irregular edges, the system combines them into one continuous graphical indicator that represents the aggregate collision risk along the estimated course, thereby improving legibility while maintaining risk evaluation reliability
Solution Approach 2:
The patent segments the risk range display into discrete continuous points along the estimated course. By calculating risk values at multiple discrete points and connecting them to form a continuous range, the system creates a segmented yet continuous visual representation that is easier to interpret than overlapping circles while preserving the temporal and spatial distribution of collision risks
2Measurement precision
If points are spaced closely to improve accuracy of risk evaluation, then the measurement precision is improved, but the calculation load increases
Solution Approach 1:
The patent applies partial action by selecting a representative subset of discrete points along the estimated course rather than calculating risk at every possible position. This allows the system to achieve sufficient measurement precision for collision risk evaluation without performing excessive calculations, thereby balancing accuracy with computational efficiency
Solution Approach 2:
The patent changes the parameter of point spacing from fixed close intervals to adaptive intervals based on risk threshold comparisons. By adjusting the spacing and number of calculation points according to the specific maritime situation and risk levels, the system optimizes the balance between measurement precision and calculation load, performing detailed analysis only where necessary
Data Source
AI summary
The present disclosure provides a ship monitoring system capable of improving legibility of an OZT. The ship monitoring system includes a first data generator, a second data generator, and processing circuitry. The first data generator generates first ship data indicative of a position and a velocity of a first ship. The second data generator generates second ship data indicative of a position and a velocity of a second ship. The processing circuitry calculates a risk value indicative of a risk of a collision between the first ship and the second ship based on the first ship data and the second ship data, for each point on an estimated course of the second ship, when the first ship is assumed to change a course and reach the point. The processing circuitry specifies a range where two or more continuous points have the risk values above a threshold. The processing circuitry displays a risk range including the range where the two or more continuous points have the risk values above the threshold.