Mobile GNSS Antenna PCO/PCV Compensation for RTK/PPP Accuracy
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Solution Overview
Problem
Traditional GNSS positioning techniques, including RTK and PPP, fail to adequately account for phase center offset (PCO) and phase center variation (PCV) characteristics of mobile device antennas, leading to inaccuracies in positioning due to variable attitudes and environments, particularly in smartphones.
Innovation Solution
Determine a phase center profile of the antenna in a fixed-frame condition and incorporate attitude information into the compensation procedure when the device is in a non-fixed frame, using sensors like gyroscopes and accelerometers to enhance GNSS-based positioning by aligning the device frame to an earth-centered, earth-fixed frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional GNSS positioning techniques (RTK/PPP) are used without antenna PCO/PCV compensation, then the positioning system is simple and easy to implement, but the positioning accuracy deteriorates to meter-level precision
Solution Approach 1:
The patent applies preliminary action by pre-determining the phase center profile of the antenna when the mobile device is in a fixed-frame condition. This pre-characterization of antenna behavior under controlled conditions allows the system to later compensate for PCO and PCV effects during mobile operations, improving positioning accuracy without requiring real-time complex measurements
Solution Approach 2:
The patent utilizes parameter changes by incorporating attitude information (orientation parameters) into the phase center profile compensation procedure. When the device transitions from fixed to non-fixed frame, the system adjusts the phase center parameters based on measured attitude changes, allowing accurate compensation despite varying device orientations
2Measurement precision
If antenna phase center compensation is implemented for mobile devices with variable attitudes, then positioning accuracy improves to sub-millimeter levels, but the complexity of the positioning procedure increases
Solution Approach 1:
The patent applies dynamics by making the phase center compensation adaptive to the device's operational state. The system dynamically switches between fixed-frame and non-fixed-frame compensation modes based on device motion detection, and continuously updates the phase center profile using real-time attitude information from sensors, enabling accurate compensation for mobile devices with varying orientations
Solution Approach 2:
The patent uses attitude information from device sensors as an intermediary to bridge the gap between the antenna's physical orientation and the phase center profile compensation. This intermediary parameter allows the system to translate complex three-dimensional orientation changes into applicable corrections for the phase center parameters, simplifying the overall compensation process
3Reliability
If phase center profile is determined in fixed-frame condition and compensated for non-fixed frame, then positioning accuracy is maintained during device movement, but additional sensor data processing is required
Solution Approach 1:
The patent applies segmentation by separating the phase center compensation process into distinct components: the fixed-frame phase center profile determination and the non-fixed frame attitude-based compensation. This segmentation allows each component to be optimized independently - the profile determination uses controlled fixed conditions while the compensation uses sensor data for mobile conditions, improving overall reliability without requiring complete re-measurement
Data Source
AI summary
Techniques for global navigation satellite system (GNSS)-based positioning of a mobile device based on antenna phase center compensation are disclosed. The techniques can include determining a phase center profile of a receiver antenna of the mobile device that is placed in a fixed-frame condition and executing an antenna phase center compensation procedure upon detecting placement of the mobile device in a non-fixed frame condition. The antenna phase center compensation procedure can include obtaining attitude information of the mobile device based at least in part on sensor data obtained from one or more sensors of the mobile device, and incorporating the attitude information of the mobile device into the phase center profile of the receiver antenna of the mobile device. A global navigation satellite system-based positioning operation may be executed that includes antenna phase center compensation based at least in part on incorporating the attitude information into the phase center profile.