GPS Positioning Device Altitude Reliability Control
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Solution Overview
Problem
Existing GPS positioning systems face challenges in obtaining accurate altitude information for two-dimensional positioning, particularly under bad positioning conditions, which can lead to errors due to reliance on map data or previous three-dimensional positioning, and result in a high burden on memory storage.
Innovation Solution
A positioning device that includes means to generate three-dimensional coordinate information, assess the reliability of altitude information, renew altitude data using new information from three-dimensional positioning, and decide between three-dimensional and two-dimensional positioning based on reliability and renewal time, thereby reducing memory burden and positioning errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If altitude information is stored in advance using map data, then two-dimensional positioning can be performed, but the burden on memory storage becomes huge and altitude errors may be large
Solution Approach 1:
The patent extracts only the necessary altitude information from comprehensive map data and stores it separately. Instead of storing entire map datasets, the system extracts and stores only altitude values at specific locations, significantly reducing memory burden while maintaining positioning accuracy.
Solution Approach 2:
The patent creates a simplified copy of altitude information from detailed map data. Rather than storing the complete map database, it generates and stores a condensed version containing only altitude values needed for two-dimensional positioning, reducing storage requirements while preserving essential functionality.
2Quantity of substance
If altitude is calculated using previous three-dimensional positioning, then memory burden is reduced, but positioning errors from bad conditions affect accuracy
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors positioning conditions (such as satellite visibility and signal quality). When conditions are good, it updates altitude information from three-dimensional positioning; when conditions are bad, it relies on stored altitude data, thus adapting to varying conditions to maintain accuracy.
Solution Approach 2:
The patent makes the altitude information dynamic by allowing updates based on current positioning conditions. The system transitions between using stored altitude data and calculating new altitude from three-dimensional positioning based on real-time satellite signal quality, making the solution adaptable rather than static.
3Measurement precision
If three-dimensional positioning is performed continuously to obtain accurate altitude, then altitude accuracy is maintained, but the system complexity and processing burden increase
Solution Approach 1:
The patent applies partial action by performing three-dimensional positioning only when necessary (when positioning conditions are good or when altitude updates are needed) rather than continuously. This reduces processing burden and system complexity while maintaining adequate altitude accuracy through selective updates to the stored altitude information.
Data Source
AI summary
A positioning device includes: altitude information storing means; satellite signal receiving means; three-dimensional coordinate information generating means; positioning condition information generating means for generating positioning condition information indicating positioning condition when the three-dimensional coordinate information has been generated; reliability allowable range judging means for judging whether reliability of three-dimensional altitude information included in the three-dimensional coordinate information is within a predetermined reliability allowable range or not based on the positioning condition information; altitude information renewing means for renewing the altitude information by using the three-dimensional altitude information based on judging result of the reliability allowable range judging means; two-dimensional coordinate information generating; and positioning method deciding means for deciding whether to use the three-dimensional coordinate information generating means or to use the two-dimensional coordinate information generating means based on judging result of the renewal time evaluating means.