Positioning Apparatus Error Accumulation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing positioning apparatuses face challenges in obtaining accurate position and locus data due to measurement errors from satellite positioning systems and autonomous navigation, with errors accumulating over time, leading to inaccurate data.
Innovation Solution
A positioning apparatus that includes a position measuring section, movement measuring section, position calculating section, position selecting section, and reference position setting section, which compares accuracy indices of measured and calculated position data to select the most accurate data and sets the measured position as a reference, with the calculating index adjusted for increasing distance from the reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autonomous navigation is used to calculate position data, then positioning can be maintained when satellite positioning is unavailable, but measurement error accumulates over time leading to reduced accuracy
Solution Approach 1:
The system continuously compares the accuracy of calculated position data (from autonomous navigation) with the accuracy of measured position data (from satellite positioning). When the calculated position accuracy falls below a threshold, the system switches to using measured position data, creating a feedback loop that maintains positioning reliability while preventing error accumulation in the calculated position data.
Solution Approach 2:
The system changes the parameter used for position determination based on accuracy conditions. When satellite positioning accuracy is sufficient, measured position data is used; when accuracy deteriorates, the system switches to calculated position data. This dynamic parameter change ensures continuous positioning availability while managing accuracy through selective data sources.
2Measurement precision
If satellite positioning is used to obtain position data, then positioning accuracy can be maintained, but positioning becomes unavailable when satellite signals are blocked by buildings or in urban canyons
Solution Approach 1:
The system introduces calculated position data from autonomous navigation as an intermediary solution. When satellite positioning becomes unavailable due to signal blockage, the calculated position data serves as a mediator that maintains positioning functionality, bridging the gap between satellite-based and inertial-based positioning methods.
Solution Approach 2:
The system dynamically changes the positioning method parameter based on signal availability. When satellite signals are blocked, the system switches from using measured position data to calculated position data, ensuring continuous positioning availability while adapting to changing environmental conditions.
3Measurement precision
If the calculating index is set to reflect increasing distance from reference position, then accuracy of calculated position data can be properly evaluated, but the complexity of accuracy comparison and selection increases
Solution Approach 1:
The system changes the calculating index parameter to reflect the relationship between distance from reference position and position accuracy. By making the index dependent on distance, the system creates a straightforward comparison metric that accounts for error accumulation without requiring complex multi-parameter analysis, thus balancing accuracy evaluation with implementation complexity.
Data Source
AI summary
A positioning apparatus includes: a position measuring section to measure a present position of the positioning apparatus to obtain measured position data; a movement measuring section to measure a moving direction and a moving distance; a position calculating section to calculate the present position to obtain calculated position data by accumulating, with respect to reference position, moving data corresponds to the moving direction and the moving distance measured by the movement measuring section; a selecting section to compare accuracy of the measured position data with an accuracy index of the calculated position data to select more accurate position data; and a reference position setting section to set the measured position data as the reference position when the measured position data is selected by the selecting section; wherein the accuracy index of the calculated position data is set such that the accuracy falls correspondence with increasing distance from the reference position.