Door Motion Sensing on Moveable Platforms Under Varying Orientation
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Solution Overview
Problem
Existing systems face challenges in accurately determining the open/close status of a door on a moveable platform, especially when the platform is in motion or at varying orientations, due to the complexity of sensor data interpretation and noise reduction.
Innovation Solution
The use of a sensor device mounted on the door, equipped with an accelerometer and a gyroscope, which processes acceleration and rotation data to determine the door's status. This system employs filters, such as infinite impulse response (IIR) filters, to reduce noise and selectively activate the gyroscope based on motion detection to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If accelerometers and gyroscopes are used to determine motion of a moveable platform, then motion parameters can be obtained, but drift error accumulates over time reducing measurement precision
Solution Approach 1:
The system uses wireless communication to transmit motion data between the moveable platform and stationary platforms, creating a feedback loop where motion parameters are continuously monitored and corrected based on comparisons with stationary reference points, thereby preventing drift error accumulation over time
Solution Approach 2:
Stationary platforms act as intermediaries that provide reference motion data to correct the drift errors in the moveable platform's measurements. The stationary platforms serve as mediators between the moveable platform and the reference frame, enabling continuous error correction
2Reliability
If GPS receivers are used to determine motion, then position can be obtained, but the system becomes vulnerable to jamming and spoofing attacks reducing reliability
Solution Approach 1:
The system converts the potential harm of GPS vulnerability by implementing a differential positioning approach where relative motion between platforms is measured. This transforms the absolute positioning vulnerability into a relative measurement system that is inherently more resistant to jamming and spoofing attacks
Solution Approach 2:
The system changes the measurement parameter from absolute GPS coordinates to relative motion parameters between platforms. By measuring differential motion rather than absolute position, the system becomes resistant to GPS jamming and spoofing while maintaining accurate motion determination
3Measurement precision
If multiple stationary platforms are deployed to improve motion determination accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
Each platform (stationary or moveable) is designed with identical sensor suites and processing capabilities, allowing any platform to serve multiple functions: as a reference point, as a measureable object, or as a communication node. This universal design reduces overall system complexity while maintaining high measurement precision
Solution Approach 2:
The system segments the motion determination function across multiple independent platforms rather than using one complex centralized system. Each platform independently measures its own motion and communicates with others, dividing the overall complexity into manageable modular units that can be distributed and scaled
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 proposed solution effectively determines the open/close status of the door with high accuracy, even in challenging conditions such as motion and varying orientations, while also being robust and reliable to handle environmental noise.
Implementation Method 1
equipped with an accelerometer and a gyroscope, which processes acceleration and rotation data
Implementation Method 2
equipped with an accelerometer and a gyroscope, which processes acceleration and rotation data
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
An apparatus determining whether a moveable platform is in motion. The apparatus comprises an accelerometer and at least one processor for measuring the variance based on acceleration data from the accelerometer. Based on said variance, it determines whether the moveable platform is in motion.