GNSS Spoofing Detection via Satellite Signal Latching Mode Switching
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Solution Overview
Problem
Spoofing devices can deceive satellite signal receivers into calculating erroneous positions, posing safety risks to vehicles and others in the vicinity by transmitting fraudulent satellite signals that mimic authentic signals, which existing hybrid navigation systems may fail to detect due to consistency with inertial and satellite data.
Innovation Solution
A method and device that switch between latching and operating modes in satellite signal receivers to frequently acquire new satellite signals, allowing for the detection of discrepancies between initial and secondary positioning values, issuing a warning when these values differ by a predetermined threshold, thereby identifying spoofing operations and alerting affected vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spoofing devices transmit fraudulent satellite signals with consistent code phase and Doppler effect, then the fraudulent signals can deceive satellite signal receivers into calculating erroneous positions, but existing hybrid navigation systems fail to detect these spoofing operations
Solution Approach 1:
The patent segments the satellite signal reception process into two distinct modes: latching mode for acquiring new satellite signals and operating mode for tracking established signals. This segmentation enables the system to periodically search for new satellites while maintaining continuous positioning, creating opportunities to detect spoofing operations that would otherwise go unnoticed during normal operation.
Solution Approach 2:
The patent implements periodic switching between latching and operating modes, creating a cyclic detection mechanism. During latching mode, the system actively searches for new satellite signals, and during operating mode, it tracks established signals. This periodic action allows the system to detect inconsistencies caused by spoofing operations at regular intervals, maintaining positioning reliability while enabling spoofing detection.
2Duration of action of stationary object
If satellite signal receivers continuously track established satellite signals, then positioning continuity is maintained, but the ability to detect spoofing operations is reduced
Solution Approach 1:
The patent makes the signal reception system dynamic by implementing mode switching between latching and operating states. The system dynamically adjusts its behavior: during operating mode, it maintains continuous tracking for positioning continuity; during latching mode, it actively searches for new satellites to detect spoofing. This dynamic approach allows the system to balance positioning continuity with spoofing detection capability.
Solution Approach 2:
The patent performs preliminary action by initiating latching mode searches before potential spoofing operations can fully deceive the system. By periodically searching for new satellite signals during latching mode, the system proactively detects inconsistencies in the signal environment, enabling early detection of spoofing operations while maintaining continuous positioning during operating mode.
3Measurement precision
If hybrid navigation systems combine inertial positioning data with satellite positioning data using Kalman filters, then long-term errors in inertial positioning are compensated, but fraudulent satellite signals can still satisfy innovation tests and lead to navigation errors
Solution Approach 1:
The patent introduces an intermediary detection mechanism that operates independently of the hybrid navigation system's Kalman filter. By implementing a separate latching/operating mode detection system, the patent creates an additional layer of verification that can identify spoofing operations before they affect the hybrid navigation calculations, maintaining both positioning precision and navigation safety.
Solution Approach 2:
The patent applies preliminary anti-action by detecting spoofing operations through mode switching before the fraudulent signals can significantly impact the hybrid navigation system. The latching mode searches for new satellite signals and detect inconsistencies, preventing spoofed signals from entering the Kalman filter calculations, thus protecting navigation safety while preserving positioning precision.
Data Source
AI summary
A method of detecting an operation to spoof a first positioning device carried by a first vehicle moving in a zone in which at least one second vehicle carrying a second positioning device is also moving, the method comprising the step of causing at least one first positioning value to be calculated for each vehicle from initial satellite signals received by each device; the method being characterized in that it further comprises the steps of: causing the second device to initiate a latching stage in order to make a new search for satellite signals and using the new satellite signals received by the second device to calculate a second positioning value for the second vehicle at the same instant as the first value; comparing the first and second values relating to the second vehicle; and issuing a warning when the two values do not coincide.