GPS Spoofing Signal Removal via Phase Inversion
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Solution Overview
Problem
GPS receivers are vulnerable to spoofing attacks, which can deceive satellite navigation systems, leading to malfunctions or erroneous position measurements, particularly in critical situations like military operations or international events, necessitating a solution that does not require changes to the existing GPS receiver configuration.
Innovation Solution
A spoofing signal removal device is attached between the RF output terminal of a GPS antenna and the RF input terminal of the GPS receiver, comprising an RF-IF converter, a spoofing signal processor, an anti-spoofing signal generator, and a detector/controller, which converts and processes GPS signals to detect and remove spoofing signals by generating an anti-spoofing signal that cancels out the spoofing signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spoofing signal removal device is attached to the RF input terminal of a GPS receiver, then the GPS receiver can operate normally without being deceived by spoofing signals, but the device complexity increases due to the additional spoofing signal removal apparatus
Solution Approach 1:
The patent introduces an intermediary spoofing signal removal device that sits between the antenna and the GPS receiver. This device includes an RF-IF converter, spoofing signal processor, anti-spoofing signal generator, and detector/controller that work together to detect and remove spoofing signals before they reach the GPS receiver, thereby protecting the receiver without requiring modifications to it.
Solution Approach 2:
The spoofing signal removal device is segmented into distinct functional modules: an RF-IF converter for frequency conversion, a spoofing signal processor for detecting spoofing signals, an anti-spoofing signal generator for generating counter signals, and a detector/controller for coordinating the operations. This segmentation allows each module to perform its specific function independently, making the overall system more manageable despite the increased complexity.
2Reliability
If the GPS receiver configuration is modified to resist spoofing attacks, then the anti-spoofing capability is improved, but the ease of operation deteriorates due to the need for configuration changes
Solution Approach 1:
The patent uses an intermediary device that interfaces with the GPS receiver through its existing RF input terminal without requiring any configuration changes to the receiver itself. The spoofing signal removal device handles all anti-spoofing operations independently, allowing the GPS receiver to continue operating with its original configuration while gaining enhanced protection.
3Measurement precision
If spoofing signals are detected and removed in real-time, then the measurement precision of GPS position is maintained, but the loss of time increases due to the processing required to detect and remove spoofing signals
Solution Approach 1:
The patent implements preliminary detection and processing of spoofing signals using the detector/controller and spoofing signal processor before the signals can affect the GPS measurement. The system continuously monitors incoming RF signals, identifies spoofing attempts early, and generates anti-spoofing signals in advance, thereby minimizing the time loss and maintaining measurement precision.
Solution Approach 2:
The detector/controller provides continuous feedback by monitoring the GPS signal for spoofing characteristics and dynamically adjusting the anti-spoofing signal generation. This closed-loop feedback mechanism allows the system to quickly respond to spoofing attempts and maintain accurate GPS positioning with minimal time loss.
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
This solution ensures normal operation of the GPS receiver by effectively removing spoofing signals, preventing their influence and maintaining accurate GPS solutions without modifying the existing GPS receiver configuration.
Implementation Method 1
an RF-IF converter to convert a global positioning system (GPS) signal from an RF signal to an IF signal
Implementation Method 2
an anti-spoofing signal generator to generate an anti-spoofing signal by shifting a phase of the spoofing signal 180 degrees based on the characteristic of the spoofing signal
Data Source
AI summary
Provided is a method and apparatus for removing a spoofing signal. The apparatus may convert a global positioning system (GPS) signal from an RF signal to an IF signal, and remove a spoofing signal based on whether the spoofing signal is present in the RF signal. The apparatus may obtain and track the spoofing signal using the IF signal, and generate a characteristic of the spoofing signal. The apparatus may generate an anti-spoofing signal by shifting a phase of the spoofing signal 180 degrees based on the characteristic of the spoofing signal.