GNSS Receiver Anti-Spoofing via Band Segmentation
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Solution Overview
Problem
Global Navigation Satellite System (GNSS) receivers are vulnerable to spoofing, where malicious actors can send false signals, leading to incorrect navigation data and potential accidents, as existing systems lack effective methods to detect and mitigate such interference.
Innovation Solution
The method involves operating the GNSS receiver in a reduced operational state when spoofing is detected, by disabling data demodulation, time setting, satellite acquisition from unknown satellites, satellite differencing, error recovery, and reducing non-coherent integration time, while continuing to receive signals from other GNSS bands to maintain positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GNSS receiver processes all received signals normally, then positioning accuracy is maintained, but vulnerability to spoofing increases
Solution Approach 1:
The patent segments the signal processing by separating trusted GNSS bands from untrusted bands. When spoofing is detected in a particular band, the receiver processes signals from that band differently (using mitigation techniques) while continuing to process signals from other trusted bands normally, thus maintaining overall positioning accuracy while protecting against spoofing.
Solution Approach 2:
The patent introduces an intermediary detection and mitigation layer between signal reception and position calculation. This intermediary system detects spoofing conditions and applies mitigation techniques (such as signal weighting, filtering, or exclusion) to neutralize the harmful effects before position estimation, preserving reliability without sacrificing precision.
2Reliability
If the GNSS receiver operates in reduced operational state to mitigate spoofing, then reliability improves, but power consumption decreases
Solution Approach 1:
The patent implements dynamic operation modes that adjust the receiver's processing state based on spoofing detection. The receiver can switch between full operational mode (normal power consumption, maximum accuracy), reduced operational mode (lower power consumption, maintained anti-spoofing capability), and these transitions are dynamically controlled based on detected spoofing conditions.
Solution Approach 2:
The patent changes operational parameters (such as integration time, signal processing depth, or band-specific processing) when spoofing is detected. By adjusting these parameters rather than completely disabling processing, the system maintains anti-spoofing reliability while reducing power consumption during compromised conditions.
3Reliability
If the GNSS receiver disables data demodulation and acquisition functions to mitigate spoofing, then reliability improves, but loss of information increases
Solution Approach 1:
The patent extracts and isolates the problematic untrusted band signals from the overall processing pipeline when spoofing is detected. By separating these signals and applying mitigation techniques specifically to them (rather than disabling all processing), the system maintains access to navigation data from trusted bands while neutralizing the spoofed information.
Solution Approach 2:
The patent applies partial mitigation actions rather than complete disabling. Instead of shutting down all data demodulation and acquisition functions, the system applies mitigation techniques selectively to affected bands or signals, maintaining partial or reduced functionality that preserves necessary navigation information while protecting against spoofing.
Data Source
AI summary
In conditions in which Global Navigation Satellite System (GNSS) signal spoofing is likely occurring, a GNSS receiver may be operated in a reduced operational state with respect to one or more GNSS bands that are likely being spoofed. According to embodiments, a reduced operational state with regard to a GNSS band may comprise performing one or more of the following functions with respect to that GNSS band: disabling data demodulation and decoding, disabling time setting (e.g., time of week (TOW), week number, etc.) disabling acquisition of unknown/not visible satellites, disabling satellite differences, disabling error recovery, reducing non-coherent integration time, and duty cycling the power for one or more receiver blocks associated with the GNSS band.