GPS Positioning Error Threshold Handling in Mobile Terminals
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Solution Overview
Problem
Existing GPS positioning methods using approximate location information can fail due to large errors, especially when signal intensities from GPS satellites are weak, leading to unreliable positioning results.
Innovation Solution
A mobile communication terminal and GPS positioning method that receives assist information including approximate location and error data, allowing for re-entry of refined approximate location information when errors exceed certain thresholds, enabling the terminal to perform GPS positioning with increased certainty by switching between positioning methods based on error thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If GPS positioning is performed using approximate location information with large errors, then positioning can be attempted in areas with weak satellite signals, but the positioning process fails to complete normally
Solution Approach 1:
The patent implements dynamic switching between different positioning methods based on signal conditions. When approximate location information has large errors or satellite signals are weak, the system dynamically transitions from relying on GPS alone to combining with cellular network positioning methods, ensuring positioning completion while adapting to varying signal environments
Solution Approach 2:
The system changes the parameter of positioning method selection based on error thresholds. When the error of approximate location information exceeds a predetermined threshold, the system switches to alternative positioning approaches using cellular network data, thereby maintaining positioning reliability under different signal conditions
2Ease of operation
If GPS positioning relies entirely on automated satellite signals, then the system is simple to operate, but it becomes unreliable in areas with weak satellite coverage
Solution Approach 1:
The patent introduces cellular network positioning information as an intermediary when GPS satellite signals are insufficient. The system uses cellular base station data to provide approximate location information that serves as a bridge, enabling the GPS receiver to acquire satellite signals and complete positioning in areas with weak satellite coverage while maintaining automated operation
Solution Approach 2:
The positioning system achieves multi-functionality by integrating both GPS satellite-based positioning and cellular network-based positioning. This universal approach allows the system to automatically select appropriate positioning methods based on available resources, ensuring reliable operation whether satellite signals are strong or weak
Data Source
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AI summary
An object is to enhance certainty of a positioning process in a mobile communication terminal even with a large error of approximate location information. A mobile communication terminal 1 is a mobile communication terminal for performing GPS positioning using GPS positioning assist data and signals received from GPS satellites. The mobile communication terminal 1 has an assist data requesting unit 13 which receives as the GPS positioning assist data, approximate location information of the mobile communication terminal 1 and error information indicative of an error of the approximate location information, a GPS positioning unit 11 which performs the GPS positioning, a positioning result determining unit 14 which determines whether the error information used in the GPS positioning is not less than a threshold THM, with a failure in the GPS positioning, and an input accepting unit 15 which accepts input of approximate location information when the error information is not less than the threshold THM. The GPS positioning unit 11 again performs positioning using the approximate location information accepted by the input accepting unit 15.