GNSS Correction Data Conversion for Legacy Receiver Compatibility
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Solution Overview
Problem
Existing positioning systems using GNSS signals face accuracy limitations due to errors in signal reception, particularly in environments where communication is unreliable, and receivers supporting older standards like RTCM 10402.3 cannot utilize correction data from newer standards like RTCM 10403.2 for centimeter-level positioning.
Innovation Solution
A conversion device and associated program that process positioning correction information from RTCM 10403.2 to conform to RTCM 10402.3, generating pseudo-range and carrier phase correction amounts, enabling receivers to perform high-accuracy positioning by converting SSR message data into compatible formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning correction information is distributed in RTCM 10403.2 format, then positioning accuracy on the order of centimeters is achieved, but compatibility with receivers supporting only RTCM 10402.3 is lost
Solution Approach 1:
The patent transforms the correction data from RTCM 10403.2 format to RTCM 10402.3 format by changing the data structure parameters. The conversion device reorganizes the correction information into a different format that older receivers can process, while maintaining the essential correction values needed for centimeter-level positioning accuracy.
Solution Approach 2:
The conversion device acts as an intermediary between the RTCM 10403.2 correction data source and RTCM 10402.3 receivers. It receives correction data in the newer format, processes and converts it, then outputs compatible correction data that enables legacy receivers to achieve high-accuracy positioning without direct support for the newer standard.
2Productivity
If correction data is distributed in state amount format for efficient satellite circuit usage, then data transmission efficiency is improved, but processing complexity increases for conversion to other formats
Solution Approach 1:
The conversion device performs preliminary processing of the state amount format data by extracting essential correction values and pre-organizing them into a structure suitable for RTCM 10402.3 format. This preliminary action simplifies the subsequent format conversion process and reduces the computational complexity required at the receiver end.
Data Source
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AI summary
Provided are means for converting positioning correction information included in an SSR message as defined by "RTCM STANDARD 10403.2" to positioning correction information conforming to "RTCM 10402.3". A conversion device (103) includes a computation processing section (110 to 150) that acquires a plurality of types of positioning correction information conforming to "RTCM STANDARD 10403.2", an approximate position being a positioning result, and a satellite position of a satellite that transmits positioning information based on which the approximate position is calculated, and based on the plurality of types of positioning correction information, the approximate position, and the satellite position that have been acquired, generates pieces of element data, such as CLR and ORB, which are elements used for generating the plurality of types of positioning correction information conforming to "RTCM 10402.3", by computation, and a conversion calculation section (180) that generates the plurality of types of positioning correction information conforming to "RTCM 10402.3", based on the plurality of pieces of element data.