GNSS Datum Conversion for RTK and PPP Guidance Alignment
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Solution Overview
Problem
Existing mobile GNSS receivers operating in RTK and PPP modes face incompatibility issues due to differences in datum, leading to misalignment of guidance lines and positions, necessitating a need for data conversion between receiver navigation modes for consistent guidance planning.
Innovation Solution
A method for transforming position observations from a PPP reference frame to a universal reference frame, using an electronic data processor to assign identifiers for guidance paths or field boundaries, and transmitting transformed positions wirelessly to a central server or onboard data storage for consistent alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a mobile GNSS receiver operates in RTK mode using local base stations, then positioning accuracy is improved, but compatibility with PPP mode guidance lines deteriorates due to datum differences
Solution Approach 1:
The patent introduces a datum transformation mechanism as an intermediary that converts position observations from RTK local datum to PPP WGS-84 datum. This mediator enables compatibility between the two modes by translating coordinates through transformation parameters (translation, rotation, scaling) without sacrificing the high positioning accuracy of RTK mode or the guidance line compatibility of PPP mode.
2Adaptability or versatility
If a mobile GNSS receiver operates in PPP mode using central processing hubs, then adaptability across different reference frames is improved, but positioning accuracy deteriorates compared to RTK mode
Solution Approach 1:
The patent applies parameter transformation to convert PPP position observations from WGS-84 datum to local RTK datum using transformation parameters (translation vectors, rotation matrices, scaling factors). This allows the receiver to maintain PPP mode's adaptability while achieving RTK-level positioning accuracy by adjusting the reference frame parameters to match local requirements.
3Measurement precision
If guidance lines are collected in RTK mode, then positioning precision is improved, but reuse in PPP mode deteriorates due to datum misalignment
Solution Approach 1:
The patent performs preliminary datum transformation by converting RTK-collected guidance lines from local datum to WGS-84 datum at the time of collection. This preliminary action ensures that guidance lines are stored in a universal reference frame, enabling their reuse in PPP mode without requiring re-collection or re-transformation, thus extending their usability duration across different operating modes.
Data Source
AI summary
An electronic data processor, a reference frame converter, or a transformer is configured to transform or converting the second position in the PPP reference frame into a transformed second position in a universal reference frame. The electronic data processor is configured to assign an identifier to the first position observation and the second position observation, where the identifier indicates whether the observations are associated with a guidance path or a boundary of a field or work area.