Moving State Determination Using Error Range Filtering
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Solution Overview
Problem
Positioning devices face accuracy issues when receiving radiowaves from satellites with biased distributions due to topography or high-rise buildings, leading to unnatural or rapid changes in determined moving states, especially when positioning accuracy is low.
Innovation Solution
A moving state determining device that includes a receiver for positioning satellites and a processor, which measures motion state using sensors and performs positioning operations to obtain current positions and error ranges, using a combination of positioning accuracy and deviation from predicted positions to determine a valid moving state only when error ranges meet a predetermined accuracy standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If positioning results are used directly for moving state determination, then positioning information is available for use, but the accuracy of moving state determination deteriorates due to low-accuracy positioning results causing blurring and unnatural state transitions
Solution Approach 1:
The patent changes the parameter of positioning accuracy evaluation by calculating error ranges that incorporate both positioning accuracy metrics and deviations from predicted positions. This dynamic parameter adjustment allows the system to adaptively determine when positioning results are reliable enough for moving state determination, thus resolving the contradiction between availability and accuracy.
Solution Approach 2:
The system implements feedback by comparing actual positioning results with predicted positions based on previous moving states. This feedback mechanism allows the system to identify and filter out low-accuracy positioning results that would cause unnatural state transitions, while still utilizing high-accuracy results for reliable moving state determination.
2Duration of action of moving object
If positioning operations are performed continuously, then current position information is obtained, but unnatural or rapid changes in moving state determination occur when positioning accuracy is low
Solution Approach 1:
The system performs preliminary actions by calculating predicted positions based on previous moving states before evaluating new positioning results. This preliminary calculation establishes a reference framework that allows the system to anticipate and filter out erroneous positioning data, thereby maintaining stable moving state determination even during continuous positioning operations in challenging environments.
3Reliability
If error range calculation incorporates both positioning accuracy and deviation from predicted position, then filtering of low-accuracy results is improved, but calculation complexity increases
Solution Approach 1:
The system applies partial action by selectively incorporating only the most relevant factors into error range calculation - specifically positioning accuracy metrics and deviations from predicted positions. This selective approach provides sufficient filtering capability without requiring overly complex calculations, thus achieving reliable result filtering while maintaining reasonable computational complexity.
Data Source
AI summary
A moving state determining device includes a receiver receiving radiowaves from a positioning satellite and a processor. The processor determines a moving state of a satellite radiowave receiving unit based on a motion state measured by a sensor which measures a motion state, and performs a positioning operation based on information received by the receiver to obtain a current position and an error range thereof. In determining the moving state, a positioning operation result obtained when the error range satisfies a predetermined accuracy standard can be used. The error range is calculated based on a positioning accuracy and a deviation of the obtained current position and a predicted position calculated in accordance with the moving state. The positioning accuracy is obtained by combining each position of positioning satellites from which radiowaves are received and each receiving state of the radiowaves.