Multi-Carrier PRS Positioning for Integer Ambiguity Resolution
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Solution Overview
Problem
Existing 3GPP UE positioning methods based on wireless communication system reference signals suffer from low positioning accuracy, particularly when Global Navigation Satellite System (GNSS) signals are weak or unavailable, and Extended Kalman Filter (EKF) algorithms struggle with high user speeds and noise.
Innovation Solution
A method utilizing Carrier Phase Positioning Reference Signals (C-PRS) at multiple carrier frequencies to construct virtual phase measurements, combined with an Extended Kalman Filter (EKF) for improved integer ambiguity estimation, enhancing positioning accuracy by constructing a longer virtual wavelength to stabilize and accurately determine the user's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Carrier Phase Positioning Reference Signals (C-PRS) at multiple carrier frequencies are utilized to construct virtual phase measurements, then positioning accuracy is improved, but device complexity and calculation complexity increase
Solution Approach 1:
The patent segments the integer ambiguity resolution process into multiple stages: first resolving ambiguities at individual carrier frequencies, then using these results to constrain the search space for virtual carrier ambiguities. This segmentation reduces the overall computational complexity while maintaining positioning accuracy.
Solution Approach 2:
The patent introduces a virtual carrier frequency dimension that combines measurements from multiple physical carriers. By operating in this augmented frequency dimension, the system achieves longer effective wavelengths for ambiguity resolution while using the individual carrier measurements as constraints to manage computational complexity.
2Reliability
If a longer virtual wavelength is constructed to stabilize EKF algorithms, then positioning accuracy and algorithm stability are improved, but the search space for integer ambiguity increases
Solution Approach 1:
The patent performs preliminary resolution of integer ambiguities at individual carrier frequencies before combining measurements to form virtual carrier measurements. This preliminary action reduces the search space for the final virtual carrier ambiguity resolution, as the individual carrier results provide constraints that limit the possible solutions.
Solution Approach 2:
The patent uses individual carrier frequency measurements as intermediaries that bridge the gap between short-wavelength precise measurements and long-wavelength stable EKF operation. These intermediary measurements provide the constraints needed to resolve the ambiguity of the virtual carrier without requiring a full search of the expanded search space.
3Measurement precision
If multiple carrier frequencies are used for positioning measurements, then positioning accuracy is improved, but the complexity of integer ambiguity determination increases
Solution Approach 1:
The patent segments the integer ambiguity determination into separate steps for each carrier frequency, followed by a constrained combination step. This segmentation transforms a single complex high-dimensional ambiguity resolution problem into multiple simpler low-dimensional problems that can be solved independently and then combined.
Solution Approach 2:
The patent performs preliminary integer ambiguity resolution at each individual carrier frequency before combining the measurements. This preliminary action simplifies the final combination step, as the individual carrier ambiguity results serve as constraints that reduce the search space for the virtual carrier ambiguity.
Data Source
AI summary
A positioning method and device are provided. The positioning method provided in the present application includes: determining an integer ambiguity according to a positioning measurement value provided by a receiving end of a positioning reference signal (PRS), the positioning measurement value includes a virtual phase measurement value constructed by the receiving end using a carrier phase measurement value, the carrier phase measurement value being obtained by measuring a carrier PRS (C-PRS) by the receiving end, and the PRS includes the C-PRSs sent by a sending end of the PRS via at least two carrier frequencies; and determining a terminal position according to the integer ambiguity.