GNSS Multipath Detection Using Blocked Range Analysis
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Solution Overview
Problem
Existing satellite positioning systems face challenges in achieving accurate positioning due to error factors like multipath, especially in environments with signal interruptions, where current methods rely on low-accuracy positional information and outdated map data, leading to reduced determination accuracy and potential system unavailability.
Innovation Solution
A moving body positioning system that includes a GNSS receiver, external data acquisition, and multipath detection means to identify and correct for multipath by analyzing blocked ranges and observation statuses using image data, three-dimensional map data, or communication with different receiver stations, allowing for selection and exclusion of satellites based on multipath detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multipath determination is made using simple current position information from positioning systems, then the method is easy to implement, but determination accuracy becomes low
Solution Approach 1:
The patent introduces an intermediary approach by using blocked range information from image data or three-dimensional map data as a mediator between the positioning system and multipath detection. Instead of directly using low-accuracy current position information, the system uses visual or map-based blocked range data to determine multipath conditions, thereby improving accuracy without requiring high-precision positioning throughout the entire process
2Measurement precision
If map data is used for multipath detection, then positioning accuracy can be improved, but the map data may be old and less accurate
Solution Approach 1:
The patent applies preliminary action by acquiring blocked range information from image data or three-dimensional map data before performing multipath determination. This allows the system to prepare accurate environmental information in advance, which then can be used to improve multipath detection accuracy even when traditional map data is outdated, as the blocked range data is acquired in real-time or near-real-time from current environmental measurements
3Measurement precision
If satellites are excluded based on multipath detection, then positioning accuracy is improved, but system availability may be reduced
Solution Approach 1:
The patent applies local quality by making differentiated decisions about individual satellites based on their specific multipath conditions rather than uniformly excluding all affected satellites. The system evaluates each satellite signal's blocked range and makes localized determination about which satellites to exclude or include, allowing the system to maintain availability by using unaffected satellites while improving accuracy by excluding only those with confirmed multipath issues
Data Source
AI summary
A moving body positioning system of the present invention includes: a GNSS receiver that is included in a moving body and that receives a GNSS signal transmitted from each of one or more satellites and acquires pieces of observation data respectively corresponding to the satellites; an external data acquisition means that acquires external data; a multipath detection means that detects multipath with respect to an observation data group; and a positioning calculation means that performs positioning calculation after a selection of a satellite to be used and a satellite to be excluded on the basis of a result of the multipath detection.