Wireless Distance Anomaly Detection Without GPS
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Solution Overview
Problem
Existing position detection systems that rely on GPS positioning are ineffective in detecting anomalies, such as device movement or theft, when GPS is unavailable, compromising system safety.
Innovation Solution
A communication device equipped with a distance calculation unit, comparison target information acquisition unit, and anomaly detection unit that calculates distances with fixed devices using wireless signals, allowing for anomaly detection even without GPS, by comparing calculated distances with pre-defined comparison target information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS positioning is used for position detection, then positioning accuracy is improved, but system reliability deteriorates in GPS-denied areas
Solution Approach 1:
The patent introduces a carrier device as an intermediary that bridges the gap between the terminal device and fixed devices. The carrier device receives positioning information from the terminal device and transmits it to fixed devices, enabling position detection in GPS-denied areas through wireless communication rather than direct GPS signals.
Solution Approach 2:
The patent creates a virtual copy of the positioning system by using wireless communication to transmit positioning information. Instead of relying on physical GPS signals, the system copies the positioning function through data transmission between the terminal device, carrier device, and fixed devices, making the system reliable in environments without GPS coverage.
2Reliability
If a separate carry-out detection device is used, then anomaly detection capability is improved, but device complexity increases
Solution Approach 1:
The patent makes the terminal device universal by enabling it to perform multiple functions: positioning, anomaly detection, and communication. The terminal device acquires its own position information and compares it with expected positions to detect anomalies, eliminating the need for separate dedicated detection devices and reducing overall system complexity.
Solution Approach 2:
The terminal device performs self-diagnosis by comparing its own position information with expected positions. The anomaly detection function is integrated into the terminal device itself, allowing it to detect whether it has been carried out without requiring external monitoring devices, thus simplifying the system architecture.
3Measurement precision
If distance calculation based on wireless signal timing is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical positioning systems with a simplified wireless communication-based distance calculation system. By using wireless signal timing and the speed of light to calculate distances between fixed devices and the terminal device, the system achieves precise positioning without complex hardware, reducing device complexity while maintaining measurement precision.
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
Enables rapid detection and response to anomalies like device movement or theft, enhancing system safety without the need for additional hardware, even in GPS-denied areas.
Implementation Method 1
calculate a distance between the fixed device and the communication device based on a reception signal from the fixed device
Data Source
AI summary
A mobile device which is a communication device that wirelessly communicates with a fixed device fixed on a ground includes: a distance calculation unit that calculates a distance between the fixed device and the communication device based on a reception signal from the fixed device; a comparison target information acquisition unit that acquires comparison target information that is information indicating a distance between the fixed device and the communication device or an absolute position of the communication device, the information being based on a scheduled position of the communication device; and an anomaly detection unit that detects an anomaly occurring in the position of the fixed device based on whether the distance calculated by the distance calculation unit matches the comparison target information.