GNSS Reference System Coordinate Transfer for Positioning
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Solution Overview
Problem
The existing LTE positioning systems face inaccuracies when combining estimated positions with map data due to mismatches between earth-referenced coordinates and regional maps, particularly when transitioning between reference stations associated with different reference systems.
Innovation Solution
The proposed method involves performing carrier-phase measurements of GNSS signals and obtaining coordinates of reference stations with associated reference systems, allowing for the transfer of information between different reference systems to determine the user equipment's position accurately, even when reference stations are aligned with different coordinate systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If earth-referenced coordinates (WGS 84) are used for positioning, then global compatibility is achieved, but local accuracy when combining with regional map data deteriorates
Solution Approach 1:
The patent segments the coordinate reference system into multiple parts: a global reference system (WGS 84) for overall positioning and local reference systems for regional accuracy. The position estimation is divided into components that can be independently transformed between different reference systems, allowing simultaneous achievement of global compatibility and local precision.
Solution Approach 2:
The patent introduces coordinate transformation as an intermediary mechanism between the global WGS 84 system and local reference systems. By using transformation parameters and algorithms as mediators, the system can convert positions between different coordinate systems, thereby achieving both global adaptability and local measurement precision.
2Area of stationary object
If multiple reference stations with different reference systems are used, then coverage area is expanded, but positioning accuracy deteriorates due to coordinate system mismatches
Solution Approach 1:
The patent creates a universal positioning framework that can handle multiple reference systems simultaneously. The system is designed to work with any combination of reference stations regardless of their individual coordinate systems, making it multi-functional and adaptable to diverse geographic regions while maintaining positioning accuracy through systematic coordinate transformation.
Solution Approach 2:
The patent dynamically changes coordinate system parameters based on the specific reference stations being used. By adjusting transformation parameters according to the local reference system requirements, the system maintains high positioning accuracy across different geographic regions while expanding coverage area through the use of multiple reference stations.
3Measurement precision
If coordinate transformation between reference systems is implemented, then local accuracy is improved, but system complexity increases
Solution Approach 1:
The patent performs coordinate transformation in advance, pre-calculating transformation parameters and relationships between different reference systems. By preparing transformation data beforehand, the system reduces the computational complexity during actual positioning operations, thereby improving local accuracy without proportionally increasing system complexity.
Data Source
AI summary
Exemplary embodiments include methods of estimating the position of a user equipment, UE, in association with a plurality of reference stations. Such embodiments can include performing one or more positioning measurements (e.g., carrier-phase measurements of GNSS satellite signals), and receiving transfer information between a first reference system and a second reference system. Such embodiments can also include determining an estimate of the UE's position based on the positioning measurements for the UE, the transfer information, and location coordinates of a plurality of entities (e.g., reference stations), wherein the location coordinates of at least one entity is associated with the first reference system and the location coordinates of at least one other entity is associated with the second reference system. Other embodiments include complementary methods performed by network nodes, as well as UEs and network nodes configured to perform such methods.