GNSS Antenna Phase Center Offset Correction via Sensor Data
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Solution Overview
Problem
Current GNSS antennas are costly and not suitable for mass production due to their high price, which limits their application in the vehicle industry, where more precise positioning and orientation information are required for new vehicle functions, and existing methods for calibrating phase center offsets are complex and frequency-dependent.
Innovation Solution
A method and device for detecting correction information for GNSS antennas using sensor information to estimate angle-dependent phase center offsets, allowing for increased accuracy in localization and orientation determination without the need for high-cost antennas, by determining first and second distance information, calculating deviations, and storing correction information for orientation, which can be applied to various satellite frequencies and vehicle dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise measurement antennas with directional independence are used to achieve millimeter-range accuracy, then positioning accuracy is improved, but cost increases significantly making them unsuitable for mass production
Solution Approach 1:
The patent changes the approach from using expensive hardware with inherent directional independence to using inexpensive antennas combined with software-based correction parameters. By measuring and storing phase center offsets for different orientations and applying appropriate corrections based on antenna orientation, the system achieves high positioning accuracy with mass-producible inexpensive antennas
Solution Approach 2:
Instead of relying on expensive physical antenna designs with built-in directional independence, the patent creates virtual correction models that copy and compensate for the directional characteristics of inexpensive antennas. These correction parameters allow the system to achieve performance equivalent to expensive directional-independent antennas
2Measurement precision
If high-quality GNSS receivers with precise antennas are deployed to achieve millimeter-range accuracy, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/hardware solution of using expensive precisely-manufactured antennas with a software-based solution. By substituting physical precision with computational correction, the system achieves the same accuracy goals with simpler, mass-producible antenna hardware combined with orientation-based correction algorithms
3Ease of manufacture
If conventional GNSS antennas with phase center scattering are used, then cost is reduced, but positioning accuracy deteriorates to the meter range
Solution Approach 1:
The patent introduces orientation-based correction parameters as an intermediary between the inexpensive antenna and the positioning calculation. These correction parameters act as a mediator that compensates for the phase center scattering inherent in inexpensive antennas, enabling meter-range accuracy to be improved to millimeter-range accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables improved accuracy in GNSS positioning and orientation determination using inexpensive antennas, reducing computational resources and eliminating the need for complex antenna design adaptations across different frequencies, while accounting for vehicle components and satellite positions.
Implementation Method 1
The distance between the phase center of the GNSS antenna and the phase center of the satellite antenna is detected by propagation time measurement for the determination of the pseudo ranges
Implementation Method 2
capturing position information and orientation information of the antenna on the basis of sensor information
Data Source
AI summary
A method and corresponding device for detecting correction information for an antenna for receiving data of a satellite of a satellite navigation system includes the steps of determining first distance information of the antenna relative to a satellite of a satellite navigation system, capturing position information and orientation information of the antenna on the basis of sensor information, determining second distance information of the antenna relative to the satellite on the basis of the position information captured using sensor information, detecting a deviation of the first distance information from the second distance information, determining correction information on the basis of the detected deviation, and storing, in a data memory, the correction information regarding the orientation information captured by the sensor information. The correction information can be used in particular for correcting an angle-dependent phase center offset.