Satellite Navigation Deception Signal Detection
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Solution Overview
Problem
Conventional satellite navigation systems are vulnerable to deception signals that cause receivers to incorrectly report their location, making it difficult to detect such deceptions reliably, as they often result in inconsistent position, heading, or speed reports, which can be misleading and potentially lead to incorrect identification of the deception device's location.
Innovation Solution
Implementing a navigation receiver with a deception signal detector that continuously monitors and analyzes specific observables such as time offsets, pseudorange residuals, Doppler residuals, and velocity to identify abrupt changes or inconsistencies, which are indicative of a deception signal, using software or microprocessor-based algorithms to generate an alarm when a deception signal is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deception signal is transmitted to deceive the satellite navigation receiver, then the receiver reports an incorrect location, but the deception itself becomes detectable through analysis of signal observables
Solution Approach 1:
The patent applies preliminary action by pre-calculating expected signal characteristics (pseudorange, Doppler, time offsets) based on known satellite ephemeris and receiver position, then comparing these predictions with actual received signals. This allows the system to detect deception signals by identifying discrepancies between expected and observed parameters before making navigation decisions.
Solution Approach 2:
The patent implements feedback by continuously monitoring signal observables and comparing them against predicted values, then using this comparison to generate integrity assessments and alerts. The system feeds back information about signal consistency to the navigation processor, enabling real-time detection of deception attempts without requiring complex external verification systems.
2Ease of operation
If conventional satellite navigation signals are received without deception detection, then the receiver operates simply, but the system becomes vulnerable to deception signals causing incorrect location reports
Solution Approach 1:
The patent applies self-service by enabling the satellite navigation receiver to autonomously detect deception signals using its own received signals and internal processing capabilities. The system uses its existing hardware to perform additional signal analysis functions, comparing observed parameters against predicted values without requiring external verification systems or additional specialized equipment.
Solution Approach 2:
The patent uses signal observables (pseudorange, Doppler shift, time offsets) as intermediaries to detect deception. Instead of directly analyzing the deception signal itself, the system measures these intermediate parameters that are affected by the presence of deception signals, then uses discrepancies in these intermediaries to infer the presence of deception without needing to directly identify or characterize the deceptive transmission.
3Reliability
If deception detection algorithms are implemented, then incorrect location computations are identified, but the processing time and computational load increase
Solution Approach 1:
The patent applies partial action by implementing deception detection for only the most critical signal parameters (pseudorange and Doppler residuals) rather than analyzing all possible signal characteristics. This selective approach provides sufficient deception detection capability while minimizing computational overhead and processing time, allowing the system to maintain real-time operation without excessive computational burden.
Data Source
AI summary
A method for detecting the presence of a deception signal associated with a satellite navigation system. The deception signal has certain “observables”, which can be used by a GPS receiver to detect the presence of the deception signal.