Generalized Navigation Model for Multi-System Assisted Positioning
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Solution Overview
Problem
Current assisted navigation systems are limited to providing assistance data only for GPS satellites, and there is a need for a unified format that can support multiple satellite navigation systems, including GPS, Galileo, GLONASS, SBAS, LAAS, and QZSS, to enable seamless navigation in adverse signal conditions.
Innovation Solution
A generalized navigation model is developed that includes a satellite index field to identify the navigation system and satellite, a multi-mode orbit model to accommodate different systems, and a clock model that can describe the behavior of all supported systems, allowing for long-term orbit data storage and usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If assistance data is provided only for GPS satellites, then the system implementation is simple, but the system cannot support multiple satellite navigation systems (Galileo, GLONASS, SBAS, LAAS, QZSS)
Solution Approach 1:
The patent creates a universal assistance data format that can accommodate multiple satellite navigation systems (GPS, Galileo, GLONASS, SBAS, LAAS, QZSS) through a generalized navigation model. The satellite index field is designed to identify different navigation systems and satellites within a unified structure, allowing the same assistance data format to serve multiple purposes and systems simultaneously.
Solution Approach 2:
The assistance data format is segmented into distinct fields including a satellite index field that separately identifies the navigation system and satellite. This segmentation allows each component to be independently configured for different systems while maintaining an overall unified structure that supports multi-system operations.
2Adaptability or versatility
If a unified navigation model is created for multiple systems, then multi-system support is enabled, but the data structure becomes more complex
Solution Approach 1:
The generalized navigation model uses universal field structures that can represent different navigation systems through standardized parameters. The satellite index field universally identifies any satellite across different systems, and the orbit and clock models use comparable parameter sets that can be adapted to various systems without requiring entirely separate data structures.
Solution Approach 2:
The patent employs parameter changes to adapt the unified navigation model to different systems. By modifying specific parameters within the standardized structure (such as satellite identification values, orbital parameters, and clock correction coefficients), the same basic model framework can accurately represent multiple navigation systems with different characteristics.
3Measurement precision
If assistance data includes long-term orbit data, then positioning accuracy is improved, but data transmission and processing time increases
Solution Approach 1:
The patent incorporates long-term orbit data in advance into the assistance data provided to the terminal. By pre-calculating and providing extended orbit information before it is needed for positioning, the system eliminates the need for real-time calculation during positioning operations, thereby improving accuracy without significantly increasing processing time at the moment of positioning.
Data Source
AI summary
The invention relates to a navigation systems and elements. A network element (M) includes a receiver (M.2.2) for forming assistance data relating to at least one navigation system. The network element (M) inserts indication of the navigation system and a selected mode into the assistance data and constructs the assistance data according to the selected mode. The network element (M) has a transmitting element (M.3.1) for transmitting the assistance data via a communications network (P) to a device (R). The device (R) includes a positioning receiver (R.3) for performing positioning on the basis of one or more signals of the at least one satellite navigation system; a receiver (R.2.2) for receiving the assistance data from the network element (M); and an examining element (R.1.1) adapted to examine the received assistance data. The assistance data is adapted to be used by the positioning receiver for performing positioning of the device (R).