Barometric Pressure Fault Detection Using GNSS and Weather Models
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Solution Overview
Problem
Current methods for determining faults in barometric pressure measuring systems on flying devices are costly, time-consuming, and require complex flight tests, making it difficult to monitor the accuracy and precision of static pressure and altitude measurements in real-time.
Innovation Solution
A method using satellite navigation systems and numerical weather prediction models to determine altitude and pressure deviations, generating a warning signal if deviations exceed specified thresholds, allowing for real-time monitoring and potential automatic self-calibration of the barometric pressure measuring system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used to determine faults in barometric pressure measuring systems, then measurement precision can be improved, but the process becomes costly and time-consuming requiring complex flight tests
Solution Approach 1:
The system performs self-calibration by automatically comparing its own measurements with reference values derived from satellite navigation and weather models, eliminating the need for external calibration services and complex flight tests
Solution Approach 2:
The patent replaces traditional mechanical calibration methods with electronic/data-based approaches using satellite navigation systems and numerical weather prediction models to determine reference altitude and pressure values
2Measurement precision
If traditional calibration methods are used, then measurement precision improves, but the process becomes complex and requires additional flights and external services
Solution Approach 1:
The system uses multi-functional data sources including satellite navigation for position and altitude reference, weather models for atmospheric conditions, and compares multiple measurement systems (barometric, GPS, inertial) to provide comprehensive calibration
Solution Approach 2:
The patent introduces intermediary reference values derived from satellite navigation and weather models as mediators between the barometric pressure measurements and the actual altitude, enabling calibration without direct physical comparison
3Reliability
If real-time monitoring is implemented using satellite navigation and weather models, then fault detection capability improves, but device complexity increases
Solution Approach 1:
The system continuously compares measured barometric altitude and pressure values with reference values from satellite navigation and weather models, providing real-time feedback on calibration status and detecting faults when deviations exceed thresholds
Solution Approach 2:
The patent uses pre-existing satellite navigation data and weather model information as preliminary reference values that are ready for immediate comparison with barometric measurements, enabling rapid fault detection without delay
Data Source
AI summary
Method and device to determine fault of a pressure measuring system aboard a flying device, the system determining static pressure pAC(t) and/or barometric altitude zAC(t). The method includes: determining position POSGNSS(t) and altitude zGNSS(t) of the flying device at time t using satellite navigation system GNSS; determining a geopotential altitude zAN/PROG(t) related to pAC(t) for position POSGNSS(t) in data ANDAT or in data PROGDAT of prediction model (NWP); and/or determining static pressure pAN/PROG(t) related to zGNSS(t) for POSGNSS(t) in ANDAT or PROGDAT; determining altitude deviation Δz(t)=zGNSS(t)−zAN/PROG(t) and/or pressure deviation Δp(t)=pAC(t)−pAN/PROG(t); determining altitude deviation Δz* averaged over time Δt from Δz(t)=zGNSS(t)−zAN/PROG(t) and/or pressure deviation Δp* averaged over time Δt from Δp(t)=pAC(t)−pAN/PROG(t); and generating a warning signal if a fault of the system is detected, the fault detected if |Δz*|>G1, or |Δp*|>G2.