DME and VOR Integration for GNSS Integrity Monitoring
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Solution Overview
Problem
Global Navigation Satellite System (GNSS) receivers are vulnerable to jamming and spoofing events, which classical receiver autonomous integrity monitoring and wide solution separation algorithms cannot effectively protect, and existing backup systems like DME and VOR have not been deployed to actively assist in integrity monitoring.
Innovation Solution
A method and system that compute navigation solutions using DME/VOR and GNSS measurements, employing solution separation techniques to identify consistent measurements and verify the integrity of navigation solutions, allowing for the detection of jamming and spoofing events and ensuring the accuracy of GNSS measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DME and VOR systems are used as backup for GNSS navigation, then navigation redundancy is improved, but the systems have not been deployed to actively assist in integrity monitoring
Solution Approach 1:
The patent makes DME and VOR systems perform multiple functions: they continue to provide backup navigation while simultaneously being deployed to actively assist in GNSS jamming monitoring, spoofing monitoring, and integrity monitoring. This multi-functional deployment resolves the contradiction by enabling the systems to contribute to both navigation redundancy and integrity monitoring capabilities.
2Reliability
If classical RAIM and wide solution separation algorithms are used, then GNSS integrity monitoring is provided, but they cannot protect against satellite constellation wide threats like jamming and spoofing
Solution Approach 1:
The patent introduces DME and VOR systems as intermediary backup navigation systems that can detect and identify jamming and spoofing events. These intermediary systems provide an additional layer of protection by monitoring GNSS signal integrity and alerting when constellation-wide threats are detected, thereby extending protection beyond what classical RAIM can provide.
3Measurement precision
If multiple navigation systems are integrated, then navigation accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the navigation system into distinct functional modules: GNSS receiver, DME receiver, VOR receiver, and an integration processor that computes navigation solutions from each system separately before combining them. This segmentation allows for modular integration that improves navigation accuracy through multi-system correlation while managing complexity through structured architecture.
Data Source
AI summary
Methods and systems to process and assure integrity of DME and/or VOR measurements, detect the effects of GNSS jamming and/or spoofing events, identify GNSS measurements affected by the GNSS jamming and/or spoofing events, and assure the integrity of the GNSS measurements unaffected by jamming and/or spoofing events in a vehicle navigation system are disclosed. The methods are implemented to integrate inertial measurements, GNSS measurements, and DME/VOR measurements for the vehicle, and apply solution separation techniques to all of the measurements. The solution separation techniques use a main filter for hybridization of the inertial measurements, the GNSS measurements, and the DME/VOR measurements, with additional sub-solution filters and sub-sub-solution filters that use combinations of these measurements. This provides common processing of the GNSS and DME/VOR sensors in a single hybridization and solution separation framework.