GNSS Signal Selection for Positioning Accuracy
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Solution Overview
Problem
Existing GNSS positioning and time synchronization techniques face accuracy issues due to blocked or reflected satellite signals, leading to deteriorated performance in non-ideal reception environments.
Innovation Solution
A satellite signal reception device with a signal selection unit that normalizes satellite signal reception quality based on GNSS types, elevation angles, and frequency bands, selecting suitable signals for positioning and time synchronization while excluding invisible signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If all received satellite signals are used for positioning and time synchronization, then the number of available signals increases, but positioning accuracy and time synchronization accuracy deteriorate due to inclusion of invisible signals reflected by structures
Solution Approach 1:
The patent extracts and removes invisible satellite signals (reflected signals) from the set of received signals through signal quality assessment. The signal selection unit identifies and excludes signals that do not meet reception quality thresholds, thereby separating useful line-of-sight signals from harmful reflected signals while maintaining the maximum possible number of valid signals for positioning calculations.
Solution Approach 2:
The patent applies different quality assessment criteria to different satellite signals based on their individual reception characteristics. Each signal is evaluated independently for reception quality metrics such as signal-to-noise ratio, carrier-to-noise ratio, and elevation angle, allowing selective acceptance or rejection of signals based on their local quality properties rather than applying a uniform threshold to all signals.
2Quantity of substance
If all received satellite signals are used for positioning and time synchronization, then signal availability increases, but time synchronization accuracy deteriorates due to inclusion of invisible signals
Solution Approach 1:
The signal selection unit extracts and removes invisible satellite signals that would degrade time synchronization accuracy. By assessing reception quality metrics including signal strength, noise level, and elevation angle, the system identifies and excludes reflected signals from the set used for time synchronization, thereby maintaining high accuracy while preserving maximum signal availability.
3Measurement precision
If a strict signal selection criterion is applied to exclude invisible signals, then positioning accuracy improves, but the number of available satellite signals decreases
Solution Approach 1:
The patent dynamically adjusts signal selection parameters such as reception quality thresholds, elevation angle requirements, and signal-to-noise ratio criteria based on the current environmental conditions and signal availability. This allows the system to maintain high positioning accuracy by excluding invisible signals while adapting the selection stringency to preserve the maximum possible number of valid signals, particularly in challenging reception environments where signal availability is limited.
Data Source
AI summary
A satellite signal reception device includes: a signal selection unit configured to select a predetermined number of satellite signals on a basis of reception quality of satellite signals received by a GNSS antenna; and a measurement unit configured to perform positioning or time synchronization using the predetermined number of satellite signals selected by the signal selection unit.