Carrier Phase Positioning Using Multi-Subcarrier Ambiguity Resolution
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Solution Overview
Problem
Existing positioning technologies in wireless devices lack the accuracy and integrity required for precise location determination, particularly in 3GPP systems, due to unresolved integer ambiguity in carrier phase measurements.
Innovation Solution
A method involving reception phase measurements on multiple subcarriers, including a first and a second subcarrier, to derive integer ambiguity and improve positioning accuracy by utilizing different frequency properties, enabling carrier phase positioning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier phase measurements are used for positioning, then positioning accuracy is improved, but integer ambiguity prevents reliable position determination
Solution Approach 1:
The positioning system segments the carrier phase measurement process into two distinct stages: a first stage using a first subcarrier frequency to resolve integer ambiguity, and a second stage using a second subcarrier frequency to achieve high-precision positioning. This segmentation allows each stage to optimize for its specific function, resolving the contradiction between accuracy and reliability.
Solution Approach 2:
The system changes the subcarrier frequency parameter between measurement stages. By using different subcarrier frequencies (first subcarrier for ambiguity resolution, second subcarrier for precision positioning), the system exploits the different properties of each frequency to simultaneously achieve reliable ambiguity resolution and high positioning accuracy.
2Measurement precision
If multiple subcarriers are used for positioning measurements, then positioning accuracy is improved, but measurement and processing complexity increases
Solution Approach 1:
The measurement process is segmented into distinct stages with specific functions: the first subcarrier is dedicated to integer ambiguity resolution, while the second subcarrier is dedicated to high-precision positioning measurements. This functional segmentation simplifies the overall processing by assigning specific tasks to each subcarrier, making the complex multi-subcarrier system more manageable.
Solution Approach 2:
The system performs preliminary measurements using the first subcarrier to resolve integer ambiguity before conducting the main positioning measurements with the second subcarrier. This preliminary action eliminates the ambiguity that would otherwise complicate the main measurement process, thereby simplifying the overall processing while maintaining high accuracy.
3Measurement precision
If conventional positioning technologies are used, then system complexity is kept low, but positioning accuracy and integrity are insufficient
Solution Approach 1:
The positioning system is segmented into a multi-stage process using different subcarrier frequencies, where each stage contributes specifically to resolving the limitations of conventional positioning. This segmentation enables the system to achieve superior accuracy and integrity by distributing different functional requirements across multiple measurement stages.
Solution Approach 2:
The system changes the subcarrier frequency parameter to exploit different frequency properties for different measurement objectives. By using multiple subcarrier frequencies with different characteristics, the system achieves higher positioning accuracy and integrity while managing complexity through structured parameter variation.
Data Source
AI summary
Examples disclose a method of operating a communication node, in particular a UE, or an access node (AN), comprising: receiving, on a wireless channel, a location determination signal (LDS), in particular a positioning reference signal (PRS), on at least a first subcarrier and a second subcarrier; and providing, to a location server node (LN) a message indicative of a reception phase of the LDS on the first subcarrier. Further examples disclose a method of operating a location server node comprising obtaining, from a communication node a message indicative of a reception phase of a location determination signal on a first subcarrier. Some examples disclose a location server node comprising control circuitry configured for performing the aforementioned method. Further examples disclose a communication node comprising control circuitry configured for performing the aforementioned method.