GNSS Rover Subscribed Precision via Keyed Error Reversal
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Solution Overview
Problem
Current GPS systems, including RTK, provide either insufficient precision or high costs for users requiring accuracy between standalone and centimeter-level precision, with integrity compromised by multipath errors, and existing solutions like dithering do not offer flexible precision options for all users.
Innovation Solution
A GNSS reference apparatus introduces keyed intentional errors that are selectively reversible, allowing GNSS rovers to access subscribed precisions based on confidential error keys, enabling users to determine positions with precision between the intrinsic and erroneous levels without altering satellite signals or dithering ephemeris parameters.
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 costs increase
Solution Approach 1:
The patent segments the single RTK precision level into multiple subscribed precision levels (e.g., 10cm, 50cm, 1m, 5m). Each precision level is provided through a separate subscription tier with corresponding error keys, allowing users to choose their desired accuracy level without requiring all users to access the full RTK precision infrastructure.
Solution Approach 2:
The patent changes the precision parameter by applying different error keys to the reference carrier phase measurements. By selectively reversing intentional errors based on subscription level, the system provides multiple precision levels from the same infrastructure without requiring separate hardware or infrastructure for each precision tier.
2Device complexity
If dithering is applied to reference carrier phases to degrade accuracy, then infrastructure costs are reduced, but measurement precision deteriorates
Solution Approach 1:
Instead of degrading the reference carrier phases through dithering as in prior art, the patent introduces intentional errors that are then selectively reversed. The inversion lies in transforming a one-way degradation process into a two-way process where the error can be undone based on subscription level, thereby recovering precision for paying users while maintaining cost-effectiveness.
Solution Approach 2:
The patent introduces error keys as an intermediary mechanism between the reference carrier phase measurements and the final position calculation. These error keys act as a mediator that controls the reversal of intentional errors, enabling selective precision restoration without requiring changes to the underlying infrastructure or satellite signals.
3Reliability
If RTK systems provide high integrity positions, then reliability is improved, but the cost and complexity increase for users who do not require full RTK precision
Solution Approach 1:
The patent makes the position integrity dynamic by allowing it to vary according to subscription level. Users with higher subscriptions receive higher integrity levels through selective error reversal, while lower subscription users receive correspondingly lower integrity levels. This dynamic adjustment allows the system to match reliability provision with user needs and payment levels.
Solution Approach 2:
The patent makes the single RTK infrastructure universal by serving multiple precision and integrity levels from the same hardware platform. The system functions as both a high-precision RTK system for subscribers and a lower-precision system for non-subscribers, eliminating the need for separate infrastructure for different service levels.
4Adaptability or versatility
If multiple precision levels are provided to different GNSS rovers, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the precision control mechanism from the physical infrastructure and places it in the software/error key domain. By taking out the precision level determination from hardware complexity and embedding it in configurable error keys, the system achieves multiple precision levels without proportionally increasing device complexity. The error keys are simple data structures that can be managed software-wise.
Data Source
AI summary
This application discloses a GNSS rover having a data receiver, a position processor and a vector error reverser. The data receiver receives GNSS position-determination reference data based on a reference erroneous position having one or more keyed intentional errors made confidential with confidential error keys. The position processor uses the GNSS position-determination reference data to determine a rover erroneous position corresponding to the reference erroneous position. The vector error reverser uses confidential access to at least one confidential error key to reverse the corresponding confidential keyed intentional error in the rover erroneous position to determine a subscribed rover position.