GNSS Integrity Information via Detection Probability
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Solution Overview
Problem
Existing global navigation systems assume that errors in satellite signals can always be detected, which is not always correct, leading to reduced navigation accuracy and integrity.
Innovation Solution
A method and device for providing integrity information in a global navigation system that includes signal in space accuracy (SISA) and signal in space monitoring accuracy (SISMA) information, along with an integrity flag, to assess the reliability of satellite signals and calculate an integrity risk, allowing for alerts when this risk exceeds a predetermined limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known integrity concepts (WAAS, EGNOS) are used that assume errors can always be detected, then the system can provide integrity warnings, but the assumption is not always correct leading to reduced navigation accuracy
Solution Approach 1:
The patent changes the parameter of error detection from binary (detected/not detected) to probabilistic (detection accuracy level). By introducing the parameter p_det (probability of error detection) and transmitting it along with SISA, the system acknowledges that detection is not perfect but quantifies the detection capability. This allows receivers to make more accurate integrity assessments and maintain navigation accuracy even when detection is imperfect.
2Reliability
If the system provides detailed accuracy information about error detection capability, then the quality of service improves, but the system complexity increases
Solution Approach 1:
The patent introduces an intermediary parameter p_det that mediates between the complex ground-based monitoring system and the user receiver. Instead of transmitting complex monitoring data or making binary detection claims, the system compresses the detection capability into a single probability parameter that is easy to transmit and process. This intermediary simplifies the interface while maintaining high quality of service.
Data Source
AI summary
In a method for providing integrity information for users of a global navigation system, which comprises several space vehicles like satellites transmitting information to a device for position detection, the transmitted information comprises first information from the global navigation system about the accuracy of a signal in space error SISE of a faulty space vehicle, and second information whether or not the global navigation system assesses the faulty space vehicle as faulty. The invention is based on the assumption how exact a fault can be detected, so that performance the global navigation system can be increased; and no unfounded assumption is used which improves the quality of service.