GNSS Reference Apparatus with Keyed Intentional Errors
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Solution Overview
Problem
Current GNSS systems struggle to provide precise positioning that balances accuracy with cost-effectiveness, as existing RTK systems offer high precision but at a high cost, while standalone systems lack the integrity needed for applications requiring intermediate precision and integrity.
Innovation Solution
A GNSS reference apparatus introduces keyed intentional errors that are selectively reversible, allowing GNSS rovers to access subscribed precisions without altering satellite signals or dithering ephemeris parameters, enabling users to determine positions with varying levels of precision based on confidential error keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTK systems use highly accurate carrier phase measurements to provide centimeter-level position accuracy, then measurement precision is improved, but device complexity and infrastructure cost increase
Solution Approach 1:
The patent segments the high-precision positioning service into multiple precision levels (e.g., centimeter-level, decimeter-level, meter-level). Each level corresponds to different subscription tiers with different error key sets. This allows the system to provide differentiated precision services without requiring all users to access the full RTK infrastructure, thereby reducing overall system complexity and cost while maintaining high measurement precision for subscribing users.
Solution Approach 2:
The patent applies local quality by providing different precision levels to different user groups based on their subscription. Each subscriber receives a customized error correction profile tailored to their precision requirements. This ensures that each user gets the appropriate level of measurement precision needed for their application without paying for or requiring the full RTK infrastructure complexity.
2Reliability
If RTK systems provide high integrity positioning with protection against multipath errors, then reliability is improved, but infrastructure cost increases
Solution Approach 1:
The patent segments the integrity assurance mechanism into subscription-based tiers. Each tier provides a different level of multipath error protection through selectively reversible error keys. Users pay for the level of integrity they need, allowing the system to maintain high reliability for subscribing users without requiring the full cost of RTK infrastructure to be borne by all users.
Solution Approach 2:
The patent introduces error keys as an intermediary mechanism between the reference station and rover. These keys selectively control the reversibility of intentional errors, acting as a mediator that provides integrity protection at different levels. This intermediary layer enables reliability improvement without directly increasing infrastructure complexity, as the error key management is a software-based solution.
3Measurement precision
If differential GPS systems use code phase corrections to provide meter-level accuracy, then measurement precision is improved, but reliability deteriorates due to multipath errors
Solution Approach 1:
The patent applies preliminary anti-action by pre-computing and applying error corrections that anticipate and counteract multipath effects. The reference station calculates error profiles including multipath components and provides corrected reference data to rovers. This preliminary correction prevents multipath errors from degrading reliability, allowing differential GPS to maintain both meter-level precision and improved integrity.
Data Source
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AI summary
This writing discloses a GNSS reference apparatus having a vector error generator and a reference data server. The vector error generator generates one or more sequences of keyed intentional errors made confidential with confidential error keys, and then combines the sequences to generate a sequence of reference erroneous positions. The reference data server issues GNSS position-determination reference data based on the reference erroneous positions where the keyed intentional errors for at least one of the confidential sequences are reversible with confidential access to the corresponding confidential error key for determining a GNSS-based position.