Pseudo GNSS Signal Detection and Time Service Restraint
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Solution Overview
Problem
Pseudo GNSS signals can interfere with the time service system of communication devices, leading to failures in providing timing references, which can cause significant disruptions in wireless networks, especially when these signals cannot provide accurate localization, leap second values, time values, phase differences, or frequency differences that deviate from standard parameters.
Innovation Solution
A control method and apparatus that detect pseudo GNSS signals by identifying deviations in localization, leap second, time, phase, and frequency differences, and restrain the time service system from tracking such signals until the pseudo GNSS signal disappears, ensuring the system switches back to a reliable clock source or enters a hold state to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the time service system continuously tracks GNSS signals to provide timing references, then the system maintains operational functionality, but pseudo GNSS signals can interfere and cause large-area network disruptions
Solution Approach 1:
The system performs preliminary detection of GNSS signals to identify pseudo signals before they can interfere with the time service system. By detecting characteristics such as localization accuracy, leap second values, time values, phase differences, and frequency differences in advance, the system can prevent pseudo signal interference before it causes network disruptions
Solution Approach 2:
The system introduces an intermediary detection and control mechanism between the GNSS signal reception and the time service system. This intermediary layer analyzes signal characteristics and controls the tracking process, allowing the system to selectively accept or reject GNSS signals based on their authenticity, thereby preventing pseudo signal interference
2Object-affected harmful factors
If the system restrains the time service system from tracking GNSS signals to prevent pseudo signal interference, then network disruption is prevented, but the system cannot provide timing references when legitimate GNSS signals are available
Solution Approach 1:
The system dynamically adjusts the tracking state of the time service system based on real-time GNSS signal quality assessment. When pseudo signals are detected, the system restrains tracking; when legitimate signals are confirmed, the system resumes tracking. This dynamic approach ensures the system maintains productivity by providing timing references when possible while preventing interference when necessary
Solution Approach 2:
The system implements a feedback mechanism that continuously monitors GNSS signal characteristics and adjusts the tracking control accordingly. By evaluating parameters such as localization accuracy, time values, and frequency differences, the system provides feedback to the tracking controller, enabling intelligent decision-making that balances interference prevention with maintaining timing reference provision
Data Source
AI summary
A control method, a control apparatus and a device for preventing pseudo GNSS signal interference, and a storage medium are provided. The method includes: in response to detecting that a received GNSS signal includes a pseudo GNSS signal, restraining a time service system of a communication device from tracking the received GNSS signal; and removing the restraining on the time service system in response to detecting that the pseudo GNSS signal disappears.