GNSS Reference Apparatus with Keyed Intentional Errors
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Solution Overview
Problem
Current GPS systems, such as RTK, provide high accuracy but at a cost driven by infrastructure costs, and users may not require centimeter precision, leading to a need for intermediate precision with integrity against multipath errors.
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, enabling users to achieve precision between intrinsic and reference erroneous position levels 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 costs increase
Solution Approach 1:
The patent applies local quality by providing different precision levels of reference data to different rovers based on their specific needs. Some rovers receive degraded reference data with intentional errors for lower precision applications, while others receive full-precision RTK data for centimeter-level accuracy requirements. This allows the system to optimize resource allocation and reduce overall infrastructure complexity by not providing maximum precision to all users.
Solution Approach 2:
The patent segments the reference data into multiple precision levels. The reference receiver generates reference data at full RTK precision, then selectively degrades this data by introducing intentional errors to create lower-precision versions. This segmentation allows the same infrastructure to serve multiple precision requirements without requiring separate systems for each accuracy level.
2Reliability
If RTK systems provide high integrity positioning protection against multipath errors, then reliability is improved, but the cost driven by fixed infrastructure divided by number of users increases
Solution Approach 1:
The patent makes the RTK reference infrastructure universal by enabling it to serve multiple functions and user types simultaneously. The same reference receiver provides degraded reference data for lower-precision applications and full-precision data for high-integrity RTK applications. This multi-functionality allows the infrastructure cost to be distributed across a broader user base with varying precision needs, reducing the per-user cost while maintaining reliability for those who require it.
3Device complexity
If keyed intentional errors are introduced to degrade reference data precision, then device complexity is reduced for lower precision needs, but measurement precision deteriorates
Solution Approach 1:
The patent applies dynamics by making the reference data precision adjustable and variable. The system dynamically introduces intentional errors into the reference data based on the specific needs of each rover. This allows the precision level to be adapted in real-time, providing lower precision (and thus lower complexity) for applications that don't require centimeter-level accuracy, while maintaining full precision for applications that do.
Data Source
AI summary
This application 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.