GNSS Fast Acquisition from Prior Fixes in Limited Satellite Visibility
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Solution Overview
Problem
Existing wireless communication systems, particularly in challenging GNSS environments with limited satellite visibility, face delays in acquiring accurate positioning due to the need for decoding signals from a minimum number of satellites, impacting user experience and emergency services.
Innovation Solution
A fast acquisition algorithm (FACE) that utilizes prior position fix information and duration thresholds to estimate current position based on previous GNSS data, allowing faster SV acquisition and position computation in environments with limited satellite access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional GNSS positioning is used in challenging environments with limited satellite visibility, then positioning accuracy can be maintained, but acquisition time increases significantly causing delays
Solution Approach 1:
The system performs preliminary actions by storing prior position fix information and session duration data before the current positioning session begins. When a new positioning session starts in a challenging GNSS environment, the system retrieves this pre-stored prior data to immediately initiate position estimation, eliminating the need to wait for decoding signals from multiple satellites. This preliminary data preparation enables fast acquisition while maintaining positioning accuracy.
2Reliability
If the system waits for decoding signals from a minimum number of satellites, then positioning reliability is improved, but user experience and emergency service response are degraded
Solution Approach 1:
The system introduces an intermediary approach by using prior position fix information as a bridge between the current positioning session and the required minimum satellite decoding process. This intermediary data allows the system to provide immediate positioning service with reduced latency, while still maintaining reliability through the use of validated prior session data that meets established accuracy thresholds.
3Loss of time
If fast acquisition is implemented using prior position data, then acquisition time is reduced, but the complexity of the positioning system increases
Solution Approach 1:
The system applies discarding and recovering by selectively retaining only the necessary prior position fix information and session duration data from previous sessions. Rather than storing all historical positioning data, the system recovers only the specific parameters needed for fast acquisition (prior position, session duration, and validity thresholds), thereby reducing data management complexity while maintaining the fast acquisition capability.
Data Source
AI summary
Aspects presented herein may enable a UE to achieve a faster acquisition of its estimated location in an environment with limited satellite access or satellite visibilities. In one aspect, a UE detects that the UE is operating in a specified global navigation satellite system (GNSS) environment. The UE verifies, in response to the detection that the UE is operating in the specified GNSS environment, that a duration between a prior GNSS positioning session and a current GNSS positioning session is less than a time threshold. The UE estimates, based on the duration is less than the time threshold, a current position of the UE based on prior position fix information from the prior GNSS session.