GPS Positioning Device Adaptive Output Logic
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Solution Overview
Problem
GPS positioning systems face accuracy issues when signal reception is weak or when the GPS receiver is stationary, due to satellite movement and changing signal reception states, leading to discrepancies between calculated and true positions.
Innovation Solution
A positioning device that determines a moving amount between positioning times and evaluates if it's within a predetermined range, allowing it to output either the preceding located position or an averaged position based on satellite signals, thereby improving accuracy during stationary states and reflecting actual movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the expected position is calculated from velocity vector and elapsed time, then the position can be estimated, but the accuracy deteriorates when the GPS receiver is stationary due to satellite movement
Solution Approach 1:
The patent applies dynamics by making the position calculation method adaptive based on the movement state of the GPS receiver. The system dynamically switches between velocity-based expected position calculation and simple averaging based on whether the receiver is moving or stationary, optimizing accuracy for each state.
Solution Approach 2:
The patent changes the parameter of position calculation methodology based on movement detection. When the receiver is stationary, it uses averaging of located positions; when moving, it uses velocity-based expected position calculation, thereby adapting to different operational conditions.
2Stability of the object's composition
If the located position and expected position are averaged, then the output position can be smoothed, but the accuracy deteriorates when the GPS receiver is stationary
Solution Approach 1:
The system dynamically adjusts the position output strategy based on movement state. For stationary receivers, it outputs only the located position without averaging to maintain accuracy. For moving receivers, it averages located and expected positions to provide stable output.
Solution Approach 2:
The patent changes the position output parameter based on movement detection. When stationary, the output is the pure located position; when moving, the output is the averaged position, optimizing both accuracy and stability for each state.
3Productivity
If GPS positioning is performed continuously, then the position can be updated frequently, but the accuracy deteriorates due to changing signal reception states
Solution Approach 1:
The patent implements feedback by detecting the movement state of the GPS receiver and using this information to adjust the position calculation and output methodology. This feedback loop ensures that the appropriate calculation method is applied based on current operational conditions.
Solution Approach 2:
The system changes the position calculation parameter based on movement feedback. When the receiver is detected as stationary, the system switches to a calculation method that accounts for satellite movement effects, maintaining accuracy during frequent positioning updates.
Data Source
AI summary
A positioning device includes a moving amount determination section which determines a moving amount of the device in a period between a preceding positioning time and a present positioning time; a moving amount evaluation section which determines whether or not the moving amount is within a predetermined allowable moving range; a positioning section which locates a position of the device based on a satellite signal which is a signal from a positioning satellite; an average position calculation section which calculates an average position by averaging a preceding located position and a present located position when the moving amount evaluation section has determined that the moving amount is within the predetermined allowable moving range; and a position output section which outputs the average position.