Anti-Spoofing Satellite Navigation Chip Signal Identification
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Solution Overview
Problem
Existing satellite navigation and positioning chips are prone to misjudgment in environments with weak satellite signals, require complex threshold settings, and cannot effectively resist spoofing attacks, as they detect attacks only after position calculation and lack real-time signal filtering.
Innovation Solution
The method and chip implement a satellite RF signal identification module to preprocess signals, detect power strength, and differentiate real from false signals using RF fingerprint comparison, with self-test functions for firmware updates and signal identification, enabling timely and accurate detection and resistance to spoofing attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the chip determines spoofing attack only based on calculated position information with preset thresholds, then the determination process is simple, but the misjudgment rate is high in weak satellite signal environments
Solution Approach 1:
The patent applies preliminary action by performing signal identification and power strength detection before position calculation. The chip pre-processes satellite signals to identify whether they are real or fake signals, and detects power strength anomalies that may indicate spoofing attacks. This preliminary detection prevents erroneous position calculations from compromising the overall system reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism by adding a signal identification module and power strength detection function between the satellite signal reception and position calculation processes. This intermediary layer analyzes signal characteristics and power levels to filter out fake signals before they can corrupt the position calculation, thereby improving detection accuracy without significantly increasing overall system complexity.
2Device complexity
If the chip uses fixed latitude and longitude thresholds for spoofing detection, then the determination process is simple, but the determination accuracy is reduced due to varying positioning accuracy in different environments and movement states
Solution Approach 1:
The patent applies dynamics by making the detection thresholds dynamic rather than fixed. The chip adjusts latitude and longitude thresholds based on real-time signal quality, satellite geometry, and carrier movement state. This dynamic adaptation allows the system to maintain high detection accuracy across different environments and movement conditions without requiring complex manual threshold configuration.
Solution Approach 2:
The patent implements parameter changes by automatically adjusting detection parameters (thresholds) based on operating conditions. The system monitors signal strength, satellite visibility, and movement characteristics to dynamically modify the thresholds used for spoofing detection, thereby maintaining optimal detection accuracy across varying environments without increasing operational complexity.
3Device complexity
If the chip detects spoofing attack only after position calculation is completed, then the detection process is simple, but the chip cannot filter out spoofing attack signals or provide real position information
Solution Approach 1:
The patent applies preliminary action by implementing signal identification and power strength detection before position calculation is performed. The chip analyzes incoming satellite signals to identify potential spoofing attacks and detects abnormal power levels that indicate fake signals. This preliminary detection enables the system to filter out compromised signals before they can affect position calculation, ensuring the authenticity of position information.
Solution Approach 2:
The patent implements preliminary anti-action by taking preventive measures against spoofing attacks before they can compromise the positioning system. The chip proactively detects fake signals through power strength analysis and signal identification, and blocks or flags these signals before they can influence the position calculation process, thereby protecting the integrity of the positioning output.
Data Source
AI summary
An anti-spoofing satellite navigation and positioning method includes: receiving a positioning satellite radio frequency (RF) signal by a satellite RF receiving module, and detecting whether a power strength of the received signal exceeds a preset threshold; preprocessing the received signal by a satellite RF signal identification module, and intercepting an identifiable positioning satellite signal for identification to distinguish a real signal and a false signal; calculating the received signal to acquire real position and time information when the received signal is identified as the real signal; and sending an alarm message when the received signal is identified as the false signal. An anti-spoofing satellite navigation and positioning chip is further provided. By identifying whether the signal is a real signal or a false signal, the authenticity of the upper-layer position calculation is ensured, and the purpose of timely and accurate detection and effective resistance to spoofing attacks is achieved.