Positioning Device Multipath Environment Signal Selection
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Solution Overview
Problem
Conventional positioning devices face accuracy issues due to multipath environments, where positioning systems with relatively poor accuracy can degrade overall positioning results, especially in areas where multiple satellite systems are used simultaneously.
Innovation Solution
A positioning device that selectively uses positioning signals from satellite systems based on environmental multipath determination, discarding satellites with high error rates and prioritizing systems with higher accuracy in open sky environments, and incorporating systems with lower accuracy in multipath environments to maintain or improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple positioning systems are used simultaneously to improve positioning availability, then positioning availability is improved, but positioning accuracy deteriorates in multipath environments
Solution Approach 1:
The patent dynamically adjusts the selection of positioning systems based on real-time environmental conditions. The environment determiner continuously assesses whether the current environment is a multipath environment, and the system selector dynamically switches between using multiple positioning systems (in open sky) or fewer systems (in multipath), resolving the contradiction between availability and accuracy
Solution Approach 2:
The patent changes the parameter of system selection based on environmental parameters. By detecting environmental characteristics (multipath vs. open sky), the system modifies which positioning systems are selected for use, allowing the system to maintain high availability in open sky while ensuring accuracy in multipath environments
2Adaptability or versatility
If positioning systems with poor accuracy are used in open sky environments, then positioning availability is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies different quality standards to different positioning systems based on environmental conditions. In open sky environments, the system selectively uses only high-accuracy systems (local quality optimization), while in multipath environments, it may incorporate additional systems for improved availability, thus resolving the contradiction between availability and accuracy
3Adaptability or versatility
If all captured satellites are used for positioning calculation, then positioning availability is improved, but positioning accuracy deteriorates due to inclusion of error-prone satellites
Solution Approach 1:
The patent extracts and removes error-prone satellites from the positioning calculation. By identifying satellites with high error rates (through environment determination) and excluding them from use, the system maintains high positioning availability using remaining reliable satellites while eliminating the accuracy-degrading effect of error-prone satellites
Data Source
AI summary
A positioning device receives positioning signals from multiple positioning satellites respectively provided by multiple positioning systems, selects one or more use systems to be used in a positioning calculation processing among the multiple positioning systems based on a determination of whether a surrounding environment is an environment in which a multipath is likely to occur, and performs the positioning calculation processing by using the positioning signals from the positioning satellites provided by the positioning systems selected as the use systems.