Satellite Navigation Signal Separation for Deception Attack Avoidance
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Solution Overview
Problem
Existing satellite navigation systems are vulnerable to deception attacks, where malicious signals deceive the receiver into calculating incorrect navigation solutions, and current receivers lack methods to detect and separate normal navigation signals from combined deception signals.
Innovation Solution
A signal processing method and apparatus that generate a synthesized signal, detect deception signals based on tracking information, separate normal navigation signals, and compute navigation solutions using signal intensity correlation values and Early-Prompt-Late correlation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the receiver continuously tracks the received signal and calculates navigation solution, then the navigation solution can be continuously provided, but the receiver cannot detect deception signals and may be deceived by malicious signals
Solution Approach 1:
The patent applies preliminary action by performing deception signal detection before the navigation solution calculation. The receiver first detects whether a deception signal is present in the received signal, and only after confirming the signal is legitimate does it proceed with tracking and navigation solution calculation. This prevents deception signals from corrupting the navigation solution while maintaining continuous operation.
Solution Approach 2:
The patent introduces an intermediary deception detection mechanism between the signal reception and navigation solution calculation. This intermediary layer analyzes signal characteristics (such as correlation values, Doppler frequency, and code phase) to determine whether the received signal is legitimate or deceptive, thereby protecting the navigation system without interrupting its continuous operation.
2Stability of the object's composition
If the receiver tracks the synthesized signal including deception signal, then the signal tracking can be maintained, but the navigation solution becomes incorrect due to deception
Solution Approach 1:
The patent applies the taking out principle by extracting and identifying the deception signal component from the synthesized signal. The receiver separates the deception signal from the legitimate navigation signal through correlation analysis and signal characteristic comparison, then excludes the deception signal from the navigation solution calculation, ensuring accuracy while maintaining tracking of the legitimate signal.
Solution Approach 2:
The patent converts the harmful deception signal into a detectable anomaly. By analyzing signal characteristics such as correlation peak position, Doppler frequency shift, and code phase, the system identifies deviations caused by deception signals and uses these deviations as indicators to reject the deceptive navigation solution while maintaining signal tracking for detection purposes.
3Reliability
If the receiver monitors the tracked signal to detect deception, then deception detection capability is improved, but the system complexity increases
Solution Approach 1:
The patent applies local quality by focusing deception detection on specific critical parameters of the received signal rather than analyzing the entire signal spectrum. The receiver monitors key characteristics such as correlation peak position, Doppler frequency, and code phase at specific locations in the signal processing chain, thereby achieving effective deception detection with minimal additional complexity.
Solution Approach 2:
The patent uses parameter changes to detect deception signals by comparing variations in signal characteristics. The receiver monitors changes in correlation values, Doppler frequency shifts, and code phase deviations from expected values, and when these parameters deviate beyond thresholds, the system identifies potential deception. This approach enables detection without requiring fundamentally new processing architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively detects and avoids deception signals, allowing the system to track and compute accurate navigation solutions by separating normal navigation signals from synthesized signals, thereby preventing misdirection.
Implementation Method 1
calculating signal intensity correlation values of signals included in the synthesized signal and determining whether the deception signal is included in the synthesized signal based on the signal intensity correlation values
Data Source
AI summary
A signal processing method to avoid deception attack and apparatus for performing the same are provided. The signal processing method includes generating a synthesized signal by receiving a signal from a satellite, detecting a deception signal from the synthesized signal based on tracking information on a signal currently being tracked, separating a normal navigation signal from the synthesized signal in response to the detecting of the deception signal, and computing a normal navigation solution based on the normal navigation signal.