Positioning Device Dynamic Satellite Selection Multipath
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Solution Overview
Problem
Positioning devices face errors in multipath environments due to signal interference from buildings and other structures, leading to reduced positioning accuracy, while in open sky environments, the number of satellites used can be insufficient for high precision.
Innovation Solution
A positioning device that dynamically changes the selection criteria for satellites based on environmental conditions, using a signal receiver, environment index calculator, dispersion calculator, primary selector, environment determiner, condition changer, and position calculator to adjust the threshold for pseudo distance residuals, thereby optimizing satellite selection in both multipath and open sky environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the selection threshold for satellites is set to exclude multipath signals, then positioning accuracy in multipath environments is improved, but the number of satellites available for positioning in open sky environments decreases
Solution Approach 1:
The patent implements dynamic adjustment of satellite selection thresholds based on real-time environment classification. The system transitions from static threshold settings to dynamic adaptation, where the selection criteria automatically change according to whether the environment is classified as multipath or open sky, resolving the contradiction between maintaining high accuracy and having sufficient satellite availability
Solution Approach 2:
The system changes the selection threshold parameter based on environmental conditions. In multipath environments, a higher threshold is applied to exclude reflected signals, while in open sky environments, a lower threshold allows more satellites to be included. This parameter adaptation resolves the contradiction by optimizing the threshold value for each specific operating condition
2Measurement precision
If a fixed threshold is used for satellite selection, then the device complexity is reduced, but positioning accuracy deteriorates in varying environmental conditions
Solution Approach 1:
The system performs self-service by automatically classifying the environment and adjusting selection thresholds without external intervention. The positioning device itself determines whether it is in a multipath or open sky environment and autonomously modifies its satellite selection criteria, eliminating the need for manual configuration or external control systems
Solution Approach 2:
The system implements feedback through environment classification results that inform subsequent satellite selection decisions. The classification output feeds back into the threshold selection process, creating a closed-loop system that continuously adapts to changing environmental conditions, thereby maintaining high accuracy without requiring complex external control mechanisms
Data Source
AI summary
A positioning device receives multiple positioning signals respectively transmitted from multiple positioning satellites, changes a condition of the positioning satellites to be used in a positioning calculation processing 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 that satisfy the condition.