GNSS Satellite Search Prioritization Under Restricted Signal Coverage
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Solution Overview
Problem
GNSS devices experience extended time-to-first-fix (TTFF) in scenarios where satellite visibility is compromised, necessitating inefficient satellite reconnection algorithms that prolong the acquisition of satellite signals and position calculation.
Innovation Solution
Utilizing Public Land Mobile Network (PLMN) information to determine a region's coverage association with satellite radio frequencies, enabling a prioritized satellite search strategy to optimize GNSS sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GNSS device utilizes algorithms to search for satellites for reconnecting when satellite visibility is compromised, then the GNSS device can eventually reestablish positioning, but the time-to-first-fix (TTFF) is extended
Solution Approach 1:
The system performs preliminary actions by obtaining coverage association data that maps satellite radio frequency coverages with terrestrial network radio cell coverages before the GNSS session begins. This pre-established mapping allows the device to proactively identify suitable satellites based on PLMN information without needing to search when satellite visibility is compromised, thereby reducing TTFF while maintaining reconnection capability
Solution Approach 2:
The patent introduces coverage association data as an intermediary that bridges satellite coverage information and terrestrial network coverage information. This intermediary mapping allows the GNSS device to use readily available PLMN information from the terrestrial network to indirectly determine which satellites are likely to be visible, eliminating the need for time-consuming direct satellite searches
2Measurement precision
If the GNSS device performs a comprehensive satellite search to ensure accurate positioning, then positioning accuracy is improved, but the time and power consumption increase
Solution Approach 1:
The system applies local quality by using coverage association data to identify and prioritize specific satellites that are most likely to be visible in the device's current location. Instead of uniformly searching all satellites, the device focuses its acquisition efforts on a subset of satellites whose coverage areas locally match the device's position derived from PLMN information, thereby achieving accurate positioning with reduced time
3Measurement precision
If the GNSS device performs a comprehensive satellite search to ensure accurate positioning, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The system applies local quality by using coverage association data to identify and prioritize specific satellites that are most likely to be visible in the device's current location. Instead of uniformly searching all satellites, the device focuses its acquisition efforts on a subset of satellites whose coverage areas locally match the device's position derived from PLMN information, thereby achieving accurate positioning with reduced power consumption
Solution Approach 2:
The patent applies partial action by performing a limited satellite search based on the coverage association mapping rather than a comprehensive search of all satellites. The device obtains coverage association data and uses it to identify a restricted set of candidate satellites, performing acquisition only on these partial candidates, which is sufficient to achieve accurate positioning without the excessive power consumption of a full search
Data Source
AI summary
An example method for Global Navigation Satellite System (GNSS)-based positioning performed by a GNSS device, the method may include receiving, from a terrestrial network, Public Land Mobile Network (PLMN) information of the GNSS device, indicating a region in which the GNSS device is located and obtaining a coverage association mapping radio frequency signal coverages of a plurality of satellites with one or more fixed radio cells of the terrestrial network, wherein the coverage association is determined based on orbital information of the plurality of satellites. The method may also include determining a list of satellites based on the coverage association and the region indicated by the PLMN information and determining one or more satellites from the list with which to perform a GNSS session by searching satellites on the list in accordance with a priority established in the list.