Spoofing Detection for Civilian GNSS Signals Using Encrypted Bursts
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Solution Overview
Problem
Unencrypted civilian GNSS signals are vulnerable to spoofing attacks, which cannot be effectively detected using existing receiver autonomous integrity monitoring techniques, as spoofer can mimic true signals, leading to incorrect location and time determinations.
Innovation Solution
A system and method that processes intermittent bursts of encrypted GNSS signals to determine if unencrypted signals are being spoofed by utilizing a high-gain ground-based antenna to determine truth values of encrypted signal features, which are then combined with user receiver estimates to compute a detection statistic compared to a threshold, allowing for sophisticated spoofing detection without altering the signal structure of unencrypted signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If unencrypted civilian GNSS signals are used, then ease of operation and accessibility are improved, but vulnerability to spoofing attacks increases
Solution Approach 1:
The patent introduces encrypted signals as an intermediary element to detect spoofing attacks on unencrypted signals. The encrypted signals serve as a reference or mediator that allows the receiver to verify the authenticity of unencrypted signals without requiring changes to the unencrypted signal structure itself.
Solution Approach 2:
The patent segments the detection process into separate processing of encrypted and unencrypted signals. By processing short segments of encrypted signals and comparing them with corresponding unencrypted signal segments, the system can detect spoofing without requiring continuous access to encrypted signals.
2Measurement precision
If encrypted signals are processed continuously, then spoofing detection accuracy is improved, but use of energy and processing load increase
Solution Approach 1:
The patent implements periodic processing of encrypted signal segments rather than continuous processing. The receiver processes short segments of encrypted signals at intervals, which reduces energy consumption and processing load while maintaining adequate spoofing detection accuracy through selective sampling.
3Reliability
If real-time access to encrypted signal information is required, then spoofing detection reliability is improved, but device complexity and infrastructure requirements increase
Solution Approach 1:
The patent prepares encrypted signal segments and their corresponding unencrypted signal segments in advance for comparison. By pre-processing and storing these signal segments, the system reduces the need for complex real-time infrastructure while maintaining detection reliability through prepared reference data.
Data Source
AI summary
A system and method for detecting spoofing of signals by processing intermittent bursts of encrypted Global Navigation Satellite System (GNSS) signals in order to determine whether unencrypted signals are being spoofed. The system and method can allow a specially equipped GNSS receiver to detect sophisticated spoofing that cannot he detected using receiver antonomous integrity monitoring techniques. The system and method do not require changes to the signal structure of encrypted civilian GNSS signals, but instead use a short segment of an encrypted signal that is broadcast by the same GNSS spacecraft which broadcast the unencrypted signal of interest.