GNSS Receiver Self-Diagnostics for Impending Failure Detection
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Solution Overview
Problem
Existing methods for detecting the impending inoperability of position determination devices, such as those used in navigation and toll collection systems, are not reliable and often require additional components or react only after complete failure, leading to potential delays in maintenance.
Innovation Solution
A method that analyzes fluctuations in GNSS signal strength over time to predict impending device failure, using a comparison of initial and subsequent signal strengths with threshold values to trigger early warnings without the need for additional sensors or components, applicable to various GNSS systems like GPS, GLONASS, and Galileo.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components like mobile radio receivers are added to detect device failure, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The GNSS receiver performs self-diagnostics by monitoring its own signal reception quality. The determination device evaluates whether poor reception is due to actual device failure or environmental factors by analyzing signal characteristics from multiple satellites, allowing the system to detect failures without additional external components
Solution Approach 2:
The system continuously monitors GNSS signal reception quality and provides feedback about device operability status. By comparing signal strength and quality metrics over time, the determination device can identify degradation patterns and alert users before complete failure occurs
2Device complexity
If monitoring is performed only after complete failure, then device complexity is reduced, but loss of time increases
Solution Approach 1:
The determination device performs preliminary assessments of GNSS reception quality by analyzing signal strength and satellite geometry before complete failure occurs. By evaluating reception conditions in advance and comparing them against known good conditions, the system can predict potential failures and prompt users to seek service before the device becomes completely inoperable
Data Source
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AI summary
The invention relates to a method for signaling an impending malfunction of a positioning device (PV) equipped with a GNSS receiver (GE), comprising the following steps: determining a first received signal strength of a GNSS signal received by the GNSS receiver (GE), determining a second received signal strength of the GNSS signal received by the GNSS receiver (GE), evaluating the first and second received signal strengths, and deciding whether to trigger a signal, depending on the result of the evaluation. The invention further relates to an associated signaling system, a fee collection system, a positioning device, and a computer program.