GNSS Receiver Selective Assistance Data Storage
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Solution Overview
Problem
Global navigation satellite systems (GNSS) receivers face increased hardware costs due to the need for significant memory to support multiple types of assistance data with different formats and contents, which are required to improve position measurement accuracy.
Innovation Solution
A GNSS receiver with a first storage unit and a decision module that selectively stores and processes only the necessary assistance data from various sources, discarding redundant data to reduce memory requirements, allowing for the modification of pseudo-range and Doppler measurements based on the stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the GNSS receiver stores all assistance data from multiple data sources to support multiple types of correction messages, then the receiver can correct position measurements from various sources (RTCM, SBAS, A-GPS), but the memory requirement increases significantly, leading to increased hardware cost
Solution Approach 1:
The patent extracts and stores only the essential assistance data (ephemeris data, clock correction data, and ionospheric correction data) from multiple correction message sources (RTCM, SBAS, A-GPS) into a single memory unit, discarding redundant data that can be regenerated or obtained from other sources. This selective extraction reduces memory requirements while maintaining the capability to support multiple assistance data types.
Solution Approach 2:
The patent creates a universal assistance data storage structure that can handle multiple types of correction messages (RTCM, SBAS, A-GPS) through a single memory unit and unified data processing pathway. The receiver uses a single set of stored ephemeris, clock, and ionospheric data to correct measurements from any satellite system, making the memory system multi-functional rather than requiring separate storage for each data source.
2Measurement precision
If the GNSS receiver stores complete assistance data from all correction messages, then position measurement accuracy can be improved through comprehensive error correction, but the hardware cost increases due to larger memory requirements
Solution Approach 1:
The patent extracts only the critical components needed for accurate position measurement (ephemeris data for satellite orbit, clock correction data for timing synchronization, and ionospheric correction data for signal propagation correction) from the complete assistance data sets. By storing only these essential elements rather than all available correction data, the system achieves high measurement precision with reduced memory capacity, thereby lowering hardware costs.
Solution Approach 2:
The patent changes the parameter of data completeness by storing a optimized subset of assistance data parameters (ephemeris, clock, ionospheric) rather than complete data sets from all correction messages. This parameter optimization maintains sufficient accuracy for position measurement while reducing the memory capacity required, thus lowering hardware manufacturing costs.
Data Source
AI summary
Methods and apparatuses for processing correction messages in a GNSS receiver are provided. One of the proposed methods includes providing a first storage unit; receiving a plurality of correction messages from at least one data sources, wherein a plurality of assistance data are carried by the plurality of correction messages; and storing a portion of the assistance data in the first storage unit without storing remaining assistance data in the GNSS receiver.