Satellite Navigation Anti-Spoofing via Semi-Codeless Signal Validation
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Solution Overview
Problem
Civilian GPS devices are vulnerable to spoofing attacks, which provide misleading information by broadcasting counterfeit signals that resemble genuine GPS signals, and existing technologies cannot detect such attacks effectively, especially in the case of non-encrypted signals.
Innovation Solution
Implementing semi-codeless techniques to utilize encrypted GPS signals to reconstruct carrier signals and compare them with non-encrypted signal measurements, allowing for the detection of authentic satellite signals and identification of spoofing attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-encrypted signals are used for location determination, then accessibility and ease of operation are improved, but vulnerability to spoofing attacks increases
Solution Approach 1:
The patent introduces encrypted signals as an intermediary element that does not directly provide location information but serves as a mediator to verify the authenticity of non-encrypted signals. The receiver compares characteristics of encrypted signal measurements with non-encrypted signal measurements to detect spoofing attempts, thus protecting the accessibility of non-encrypted signals without compromising security.
2Reliability
If encrypted signals are processed to detect spoofing, then security against spoofing attacks is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential characteristics from the encrypted signals (such as signal strength, carrier frequency, and phase information) without attempting to fully decrypt or process the entire encrypted signal content. This selective extraction approach reduces the computational burden and device complexity while still providing sufficient data for spoofing detection when compared with non-encrypted signal measurements.
3Measurement precision
If semi-codeless techniques are used to process encrypted signals, then measurement precision for location determination is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies semi-codeless techniques that perform partial signal reconstruction and measurement of encrypted signals without requiring complete signal processing or full decryption. This partial action approach achieves sufficient measurement precision for location determination and spoofing detection while avoiding the excessive complexity of complete signal analysis, balancing accuracy with computational feasibility.
Data Source
AI summary
Embodiments are generally directed to anti-spoofing techniques for satellite navigation systems. In general, the anti-spoofing techniques use codeless or semi-codeless tracking of encrypted satellite signals to generate measurements that can be used to perform consistency checks to received non-encrypted signals. The consistency checks will detect if the non-encrypted signal is a genuine satellite signal or a spoofing signal.