Ship Collision Risk Zone Display Using Size-Based Distance Assessment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ship maneuver supporting devices fail to accurately consider the actual sizes of ships, leading to potential collisions and increased computational complexity in collision risk calculations.
Innovation Solution
A ship maneuver supporting device that calculates collision risk zones based on separating distances between ships, using a risk function to evaluate collision and watch zones, reducing computational complexity by considering ship sizes and eliminating the need for simultaneous existence probability calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the OZT is calculated by considering ships as points and using simultaneous existence probability, then the calculation method is simple, but the accuracy of collision risk indication is insufficient and does not match actual navigation feel
Solution Approach 1:
The patent changes the fundamental parameter from point-based position to size-inclusive position by introducing the ship's length parameter. The risk calculation uses the relationship between ship length and distance to other ships, transforming the approach from point geometry to extended object geometry, thereby improving accuracy while keeping calculations manageable
Solution Approach 2:
The patent extracts the essential element for accurate collision risk assessment - the ship's physical size - from the complex simultaneous existence probability calculation. By focusing only on the distance relationship and ship length, it removes unnecessary computational complexity while retaining the critical factor for accurate risk indication
2Reliability
If the simultaneous existence probability calculation is performed considering speed errors, then the theoretical framework is comprehensive, but the computational complexity significantly increases
Solution Approach 1:
The patent extracts the core risk assessment function from the complex simultaneous existence probability calculation by removing the speed error consideration component. It retains only the essential distance-based risk evaluation, thereby maintaining practical reliability while dramatically improving calculation efficiency
Solution Approach 2:
The patent replaces the expensive and computationally intensive simultaneous existence probability calculation with a simpler, more efficient distance-based risk assessment method. This substitution provides sufficient accuracy for navigation decisions without the prohibitive computational cost
3Measurement precision
If the OZT calculating points are increased to improve spatial resolution, then the indication accuracy is improved, but the calculation load becomes too heavy
Solution Approach 1:
The patent extracts the risk assessment function to its simplest form by removing the need for multiple calculation points. The distance-based method between ship centers provides continuous spatial information without requiring discretization into multiple OZT points, thereby achieving high spatial resolution with minimal calculation load
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A ship maneuver supporting device capable of displaying a collision risk zone which matches navigation feel of a ship operator with reduced calculation load, is provided. The ship maneuver supporting device 1 includes a risk calculating module 33 and a display data generating module 41. The risk calculating module 33 calculates a collision risk value for determining whether a collision risk zone that is a zone where a possibility of a collision between a first ship and a second ship will occur in the future is high is to be displayed, based on a separating distance between the position of the second ship estimated at a plurality of future time points and the position of the first ship estimated corresponding thereto, in consideration of a physical size of at least one of the first ship and the second ship. The display data generating module 41 generates display data for displaying the collision risk zone at the estimated position of the second ship, based on the determination using the collision risk value.