GPS Receiver Movement Detection for Cold Start Optimization
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Solution Overview
Problem
GPS receiving apparatuses face increased measuring time when attempting to start in hot or warm start modes after significant movement from the previous measured position, as the satellite layout changes, leading to potential calculation failures and the need for a cold start.
Innovation Solution
Incorporating a movement judging unit that determines if the GPS receiving apparatus has moved a predetermined distance, triggering a cold start mode by receiving GPS signals without relying on stored information, thereby avoiding calculation failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If hot start mode or warm start mode is used when the apparatus has moved a significant distance from the previous measured position, then the apparatus attempts to use stored GPS information for faster positioning, but the satellite layout changes cause calculation failures and extended measuring time
Solution Approach 1:
The system dynamically adjusts the start mode based on detected movement. When significant movement is detected, it switches from hot/warm start mode to cold start mode, making the positioning system adaptive to changing conditions rather than using a fixed approach
Solution Approach 2:
The system uses feedback from the movement detection unit to determine whether to use stored GPS information. The movement detection provides feedback about the apparatus's displacement, which then controls the selection of positioning mode, creating a closed-loop control system
2Productivity
If hot start mode or warm start mode is used after significant movement, then the apparatus relies on stored GPS information, but this leads to calculation failures requiring restart in cold start mode
Solution Approach 1:
The system performs preliminary movement detection before initiating the positioning calculation. By detecting movement in advance and pre-determining the appropriate start mode, it prevents calculation failures before they occur rather than recovering from them
Solution Approach 2:
The system makes the positioning approach dynamic by adjusting the start mode based on real-time movement conditions, switching between cold start and hot/warm start modes as appropriate rather than using a static, fixed approach
Data Source
AI summary
A GPS receiving apparatus and a computer readable storage medium are described. According to one implementation, the GPS receiving apparatus includes a GPS receiving unit, a storage unit, a position measuring unit, a reception control unit, and a movement judging unit. The storage unit stores GPS information. The reception control unit starts reception operation with a first or second mode. In the first mode, the GPS receiving unit uses the stored GPS information. In the second mode, the stored GPS information is not used. The movement judging unit judges whether the apparatus is moved a predetermined distance or more from a previous measured position. When the movement judging unit judges that the apparatus is moved the predetermined distance or more, the reception control unit starts reception operation with the second mode.