GNSS Correction Dissemination via Selective Phase Center Data
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Solution Overview
Problem
Current satellite positioning systems face challenges in providing accurate and timely GNSS corrections, leading to potential positioning errors and inefficiencies in data transmission, particularly in scenarios requiring high accuracy and integrity, such as autonomous vehicle navigation and surveying.
Innovation Solution
A system and method that disseminates GNSS corrections, including phase center offset and phase center variation data, to improve the accuracy and integrity of receiver positioning by selectively transmitting relevant corrections based on satellite constellations, antenna properties, and angular dependencies, optimizing bandwidth usage and reducing data impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If comprehensive GNSS corrections including phase center offset and phase center variation data are transmitted, then positioning accuracy is improved to millimeter-level precision, but bandwidth requirements and data transmission load increase
Solution Approach 1:
The patent segments GNSS correction data into distinct types (phase center offset, phase center variation, antenna properties) and selectively transmits only the relevant segments based on the receiver's specific antenna characteristics and observational requirements, rather than transmitting all correction data universally
Solution Approach 2:
The patent applies local quality by customizing the correction data transmission according to the specific antenna properties of each receiver. Different receivers receive different subsets of correction data tailored to their antenna configurations, ensuring each receiver gets precisely the right amount and type of corrections needed for its local setup
2Reliability
If GNSS corrections are updated frequently to ensure up-to-date data, then positioning integrity is improved, but data transmission frequency and bandwidth consumption increase
Solution Approach 1:
The patent implements periodic action by establishing scheduled update intervals for different types of GNSS correction data based on their volatility and importance. Critical corrections like phase center offset may be updated more frequently than less critical parameters, creating a tiered periodic update strategy that balances integrity with transmission efficiency
Solution Approach 2:
The patent applies dynamics by making the correction data update strategy adaptive rather than static. The system dynamically adjusts update frequencies and data transmission based on current operational conditions, satellite visibility, and changing positional requirements, optimizing the balance between integrity and bandwidth usage in real-time
3Quantity of substance
If selective transmission of corrections based on satellite constellations and antenna properties is implemented, then bandwidth usage is optimized, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-characterizing antenna properties and pre-categorizing correction data types before actual GNSS operations. The system performs initial antenna measurements and stores reference data, then uses this pre-prepared information to quickly determine which corrections to transmit during operation, avoiding complex real-time analysis
Solution Approach 2:
The patent introduces an intermediary layer (the correction selection module) that sits between the GNSS correction source and the receiver. This intermediary automatically filters and selects appropriate corrections based on pre-stored antenna characteristics and current satellite visibility, shielding the user from the complexity of the selection process while optimizing bandwidth usage
Data Source
AI summary
A method for disseminating corrections can include receiving a set of satellite observations at a GNSS receiver; transmitting the corrections to the GNSS receiver, wherein the corrections; and determining a position of the GNSS receiver, wherein the set of satellite observations are corrected using the corrections. A system for disseminating corrections can include a positioning engine operating on a computing system collocated with a GNSS antenna; and a corrections generator operating on a computing system remote from the GNSS antenna, wherein the corrections generator is configured to transmit corrections to the positioning engine, wherein the positioning engine is configured to determine a high accuracy position of the GNSS antenna using the corrections, wherein the corrections are rebroadcast to the positioning engine with a time period less than an update time period for changing the corrections.