Multi-Antenna GNSS Phase Detection for Spoofed Signal Rejection
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Solution Overview
Problem
Existing Global Navigation Satellite Systems (GNSS) are vulnerable to spoofing attacks that can mislead navigational systems, leading to inaccurate location and timing data, posing risks to critical vehicles and operations.
Innovation Solution
A system and method using multiple GNSS antennas to measure phase differences of satellite signals, comparing range and location computations to detect false signals by identifying identical or near-identical measurements across antennas, thereby indicating spoofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-antenna GNSS receivers are used, then the system is simple and easy to operate, but the system is vulnerable to spoofing attacks and cannot detect false signals
Solution Approach 1:
The system divides the single receiver into multiple antenna elements that work together. Each antenna receives GNSS signals independently, and the system processes phase differences between these segmented antenna elements to detect spoofing attacks, thereby improving reliability without requiring completely new system architecture
Solution Approach 2:
The patent introduces an intermediary processing mechanism that analyzes phase differences between antenna elements. This intermediary layer acts as a detector that processes the raw signal data from multiple antennas and identifies inconsistencies indicative of spoofing, adding anti-spoofing capability without fundamentally redesigning the entire receiver system
2Measurement precision
If multiple antennas are used to detect false signals through phase difference measurement, then signal authenticity can be verified, but the device complexity and computational requirements increase
Solution Approach 1:
The system applies local quality analysis by examining the phase difference characteristics specific to each antenna element's received signal. Rather than requiring complex hardware changes across all antennas, the patent focuses on analyzing the local phase relationship data from each antenna to verify signal authenticity, achieving high measurement precision with moderate complexity increases
3Reliability
If phase difference computations are performed across multiple antennas, then false signals can be identified, but the processing time and computational load increase
Solution Approach 1:
The system performs preliminary action by continuously monitoring and pre-processing phase difference data from multiple antennas even before spoofing attacks occur. This allows the system to establish baseline characteristics and quickly compare incoming signals against these pre-established patterns, enabling rapid detection of false signals without requiring extensive real-time computation during critical moments
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 prevents the influence of false GNSS satellite signals, ensuring accurate location and timing data by differentiating between genuine and spoofed signals.
Implementation Method 1
A system and method using multiple GNSS antennas to measure phase differences of satellite signals
Data Source
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AI summary
Disclosed is a system and method for detecting false Global Navigation Satellite System (GNSS) satellite signals. False GNSS satellite signals can be used malevolently to take control of a body such as a vehicle or ship that is using GNSS satellite signals for navigation. In some embodiments a GNSS attitude system is used to detect the false GNSS satellite signals. The GNSS attitude system measures the code or carrier phase of the GNSS satellite signals at two or more antennas to detect the false GNSS satellite signals. In some embodiments the attitude system computes first measured and second estimated carrier phase differences in order to detect the false GNSS satellite signals. The attitude system may compute the attitude of a baseline vector between the two antennas. Once false GNSS satellite signals are detected, the method can include preventing the attitude determining system from outputting position or location data.