Terminal Dead Reckoning Route Tracking for Signal Loss
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Solution Overview
Problem
Individuals lost in outdoor areas without mobile phone signals face challenges in quickly returning to locations with signal coverage to seek help, as existing positioning technologies consume significant power and are unreliable in signal-absent areas.
Innovation Solution
A method utilizing dead reckoning to determine a traveled route from the moment a signal disappears to the moment a distress signal is sent, minimizing satellite positioning system usage to conserve power and enabling users to return to a location with signal coverage, thereby ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite positioning system is always enabled during outdoor activities, then location information precision is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic satellite positioning updates rather than continuous operation. The system obtains satellite positioning information at specific intervals (e.g., when signal is available) and combines this with dead reckoning calculations for continuous location tracking, thereby reducing power consumption while maintaining acceptable location precision.
Solution Approach 2:
The patent introduces dead reckoning as an intermediary method to bridge the gap between periodic satellite positioning updates. By using sensor data (accelerometer, gyroscope, magnetometer) to calculate position changes between satellite updates, the system maintains continuous location tracking without requiring continuous satellite positioning, thus resolving the contradiction between precision and power consumption.
2Use of energy by moving object
If base station positioning service is used, then power consumption is reduced, but positioning becomes unavailable in areas without mobile phone signal
Solution Approach 1:
The patent merges multiple positioning methods (satellite positioning, base station positioning, and dead reckoning) into a unified hybrid positioning system. The system dynamically selects and combines these methods based on signal availability and power consumption requirements, ensuring reliable positioning in both signal-rich and signal-poor environments while optimizing power usage.
Solution Approach 2:
The patent dynamically changes positioning parameters (such as update frequency, method selection, and calculation intensity) based on environmental conditions like signal strength and power level. This allows the system to adapt between power-efficient base station positioning in urban areas and more reliable satellite/dead reckoning combinations in remote areas.
3Ease of operation
If user stays in location without signal to wait for help, then no movement is required, but power runs out and danger increases
Solution Approach 1:
The patent performs preliminary actions by pre-calculating and storing the reverse route from the current location back to the last known signal location. When the user needs help, this pre-computed route is immediately available for navigation, eliminating the need for real-time route calculation and enabling quick evacuation to signal areas, thus reducing time loss while maintaining operational simplicity.
4Measurement precision
If dead reckoning is performed continuously from first moment to second moment, then route tracking precision is improved, but power consumption increases
Solution Approach 1:
The patent applies partial dead reckoning by performing calculations only for the necessary time period (from signal loss to distress signal) and using only the minimum required sensor data. The system selectively activates sensors and performs calculations only when needed, rather than continuously, thereby achieving sufficient route tracking precision with reduced power consumption.
Data Source
AI summary
A method, apparatus, and terminal for obtaining a route are provided, including techniques and related apparatus for: obtaining, by a terminal, a first moment at which a signal in the terminal disappears and first location information of the terminal at the first moment, and performing dead reckoning starting from the first moment; obtaining, by the terminal, a second moment at which a user sends a distress signal and second location information of the terminal at the second moment, and ending the dead reckoning, to obtain a first dead reckoning curve; and determining, by the terminal, a track of a traveled route based on the first moment, the second moment, the second location information, the first dead reckoning curve, and each moment between the first moment and the second moment.