Ship Collision Risk Assessment Using Time and Distance Criteria
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing collision risk assessment systems, such as CPA collision alarms, do not align with navigators' varying assessment criteria based on time or distance, leading to mismatched collision alarms.
Innovation Solution
A navigation assistance device that calculates and combines time-based and distance-based collision risk values, allowing adjustable weights for reference time and distance to tailor assessment criteria, and issues alarms based on combined risk determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CPA collision alarm based on time until closest approach is used, then collision risk assessment is simplified and standardized, but it does not match the assessment criteria of navigators who use distance as a criterion
Solution Approach 1:
The patent merges time-based collision risk assessment (CPA alarm) and distance-based collision risk assessment into a unified system. The determination unit combines both assessment results to determine overall collision risk, allowing the system to accommodate navigators who use either time or distance as their primary criterion while maintaining standardized operation procedures.
Solution Approach 2:
The collision risk determination system is designed to serve multiple functions: it performs both time-based CPA alarm assessment and distance-based assessment, and can adapt to different navigator preferences. This multi-functionality allows the same system to cater to diverse assessment criteria without requiring separate systems.
2Reliability
If multiple assessment criteria (time and distance) are combined, then collision risk assessment becomes more comprehensive and adaptable to navigator preferences, but the system complexity increases
Solution Approach 1:
The patent segments the collision risk assessment function into distinct calculation units: a first calculation unit for time-based CPA alarm assessment and a second calculation unit for distance-based assessment. This segmentation allows each unit to handle its specific criterion independently, improving reliability while managing complexity through modular design.
Solution Approach 2:
The determination unit acts as an intermediary that receives results from both the first calculation unit (time-based) and second calculation unit (distance-based), combines these assessments, and determines the overall collision risk. This intermediary structure enables comprehensive assessment while keeping the combination logic centralized and manageable.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
[Problem] To provide a navigation assistance device with which it is possible to combine assessment criteria pertaining to a risk of collision. [Solution] A navigation assistance device comprising: a first acquisition unit that acquires first ship data representing the position and speed of a first ship; a second acquisition unit that acquires second ship data representing the position and speed of a second ship; a first calculation unit that, on the basis of the first ship data and the second ship data, calculates a first collision risk value based on the time required for the second ship to approach the first ship; a second calculation unit that, on the basis of the first ship data and the second ship data, calculates a second collision risk value based on the distance between the first ship and the second ship; and an assessment unit that, on the basis of the first collision risk value and the second collision risk value, assesses whether there is a risk of collision between the first ship and the second ship.