Ship Object Detection Using Attitude-Displacement Correlation
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Solution Overview
Problem
Existing object detection devices on ships face difficulties in accurately detecting external objects due to sensor exposure to water and potential damage, leading to erroneous detection of ship crew or equipment as external objects.
Innovation Solution
An object detection device comprising an inertia sensor to detect ship attitude changes and an external sensor to detect objects, with a processing device determining the object's location by correlating relative displacement and attitude changes, allowing for accurate differentiation between internal and external objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensors are disposed on the periphery of the hull, then detection coverage is improved, but sensor reliability deteriorates due to water exposure and damage
Solution Approach 1:
The patent transitions sensor placement from the horizontal periphery (water level) to the vertical dimension above the hull. By mounting sensors on the bridge or cabin structure elevated above the waterline, the system maintains detection coverage while eliminating water exposure and physical damage risks associated with peripheral mounting.
2Reliability
If sensors are disposed above the hull in a central position, then sensor reliability is improved, but measurement precision deteriorates due to false detection of internal objects
Solution Approach 1:
The patent implements feedback by continuously monitoring ship attitude changes via inclination sensors and integrating this information with sensor detection data. The processing device uses this feedback to dynamically adjust detection parameters and distinguish between stationary internal objects and moving external objects, thereby maintaining high detection accuracy despite the elevated sensor position.
Solution Approach 2:
The patent introduces ship attitude data from inclination sensors as an intermediary parameter. This intermediary information serves as a reference to differentiate between objects detected by the elevated sensors, allowing the system to filter out false detections of internal objects while maintaining accurate detection of external objects.
3Area of stationary object
If sensors are disposed on the periphery of the hull, then detection coverage is improved, but device complexity increases due to protection requirements
Solution Approach 1:
The patent eliminates the need for complex protection structures by relocating sensors to the vertical dimension above the waterline. This dimensional change removes the requirement for waterproof housings, corrosion-resistant materials, and physical protection structures that would be necessary for peripheral water-level mounting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively discriminates between objects on and outside the ship, minimizing false detections and reducing initial setup complexities and costs by determining object presence based on a correlation greater than a predetermined level.
Implementation Method 1
an inertia sensor (13) configured to detect an inertial force applied to a ship (1) and output a signal of a detection value of information related to the inertial force
Implementation Method 2
an object sensor (11) fixed to the ship and configured to detect an object (20, 30) and output a signal of a detection value of information related to the object
Data Source
AI summary
An object detection device includes an external sensor, an inertia sensor, and a control device. The external sensor is fixed to a ship. The external sensor detects an object. The inertia sensor detects information related to an inertial force applied to the ship. The control device acquires a state of relative displacement of a detection object on the basis of a signal output from the external sensor. The control device acquires a state of an attitude change of the ship on the basis of a signal output from the inertia sensor. The control device determines whether a detection object is present outside the ship according to a correlation between the state of the attitude change of the ship and the state of the relative displacement of the detection object.