Satellite Navigation Device Precise Point Positioning with Local Atmospheric Data
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Solution Overview
Problem
Current satellite navigation systems face challenges in achieving precise point positioning due to the need for local infrastructure and large amounts of assistance data, which can lead to long initialization times and inefficient data transmission.
Innovation Solution
A method that involves receiving multiple positioning signals from navigation satellites using a multi-frequency receiver, separate space segment correction data, and locally requested atmospheric error data to compute precise positions or times, allowing for improved accuracy and reduced initialization time by using a PPP-AR algorithm with ambiguity resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If local infrastructure and large amounts of assistance data are used for precise positioning, then positioning precision is improved, but data transmission bandwidth and initialization time increase
Solution Approach 1:
The patent segments assistance data into two distinct types: space segment correction data (broadcast to all receivers) and local atmospheric error data (provided on-demand to specific receivers). This segmentation reduces the total data volume each receiver must process while maintaining positioning precision, as each receiver only obtains atmospheric error data relevant to its specific location rather than receiving all possible assistance data globally
Solution Approach 2:
The patent extracts and separates the local atmospheric error data component from the complete assistance data set. By identifying and extracting only the locally relevant atmospheric error information needed for precise positioning, the system eliminates unnecessary data transmission while preserving the essential precision-enhancing elements
2Measurement precision
If local infrastructure and comprehensive assistance data are provided, then positioning accuracy is improved, but initialization time increases
Solution Approach 1:
The patent implements preliminary action by having the receiver proactively request local atmospheric error data from a assistance server after receiving space segment correction data. This preliminary acquisition of location-specific atmospheric error information accelerates the initialization process by eliminating the need to wait for comprehensive assistance data to be naturally available, allowing the receiver to quickly compute precise position once the minimal necessary data is obtained
3Adaptability or versatility
If assistance data is broadcast to all receivers, then all receivers can achieve precise positioning, but data transmission efficiency decreases
Solution Approach 1:
The patent applies local quality by providing different types of assistance data to different receivers based on their specific needs and locations. Space segment correction data is broadcast universally to all receivers, while local atmospheric error data is selectively provided only to receivers that request it and for which it is relevant. This targeted approach improves data transmission efficiency by eliminating redundant data transmission while maintaining universal coverage availability
Data Source
AI summary
The present disclosure relates to a precise point positioning (PPP) method performed by a satellite navigation device. In one embodiment, the method comprises: receiving multiple positioning signals from a plurality of navigation satellites of a satellite-based navigation system using a multi-frequency receiver; receiving space segment correction data for the navigation satellites of the satellite-based navigation system; separately requesting and receiving local assistance data, wherein the local assistance data represents atmospheric errors in the vicinity of the satellite navigation device; and computing at least one of a precise position or time based on the received positioning signals, the space segment correction data and the local assistance data. The present disclosure further relates to a satellite navigation device, method for providing assistance data to at least one satellite navigation device, an assistance server, a satellite-based positioning system, and a computer program.