GNSS Orbital Assistance Data With Antenna Phase Center Compensation
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Solution Overview
Problem
Global navigation satellite systems (GNSS) typically provide location resolution of two to three meters, and there is a desire for more accurate location determination.
Innovation Solution
A mobile station receives modified orbital assistance data from a location assistance server that includes predicted orbital information and antenna phase center offset data, allowing for more accurate location determination by compensating for the offset between the satellite's center of mass and the signal radiation source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna phase center offset data is incorporated into orbital assistance data, then location accuracy is improved to within five centimeters or less, but data complexity and processing requirements increase
Solution Approach 1:
The patent combines antenna phase center offset data with orbital assistance data into a unified data structure that can be processed together. The modified orbital assistance data includes both the orbital parameters and the phase center offset corrections, allowing the mobile station to apply both corrections simultaneously without managing separate data sets, thus reducing overall system complexity while maintaining high accuracy
Solution Approach 2:
The antenna phase center offset data is pre-calculated and integrated into the orbital assistance data before transmission to the mobile station. This preliminary preparation of correction data eliminates the need for the mobile station to perform complex real-time calculations to determine phase center offsets, reducing processing requirements while achieving centimeter-level accuracy
2Measurement precision
If modified orbital assistance data with antenna phase center offset is transmitted, then location determination accuracy is improved, but communication data transmission requirements increase
Solution Approach 1:
The patent applies antenna phase center offset corrections selectively to specific satellite signals and frequency combinations that benefit most from the correction. Rather than uniformly applying corrections to all satellites and frequencies, the system targets corrections to where they provide the greatest accuracy improvement, reducing the overall data volume while maintaining high precision for critical measurements
3Productivity
If computational effort at the mobile station is reduced through pre-processed orbital assistance data, then processing time is improved, but the complexity of data preparation at the server increases
Solution Approach 1:
The patent extracts and separates the computationally intensive tasks of orbital parameter calculation and phase center offset determination, performing these operations at the location assistance server rather than at the mobile station. The server extracts the essential correction parameters and transmits only the results to the mobile station, shifting computational complexity to the server while enabling fast processing at the client device
Data Source
AI summary
A method, apparatus, and system are disclosed for providing modified orbital assistance data to a mobile station to determine its location using global navigation satellite system (GNSS). In some example embodiments, a method for determining a location of a mobile station using orbital assistance data may include: receiving satellite positioning signals from a plurality of GNSS satellites; receiving orbital assistance data comprising a distance between a location on an antenna which is associated with a first frequency of the satellite positioning signals and a location on the antenna which is associated with a second frequency of the satellite positioning signals; and determining the location of the mobile station based on the orbital assistance data and the satellite positioning signals.