GNSS Signal Suspension During Wireless Interference
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Solution Overview
Problem
GNSS signal accuracy is compromised by radio frequency interference from wireless transmitters, leading to momentary loss, delay, or generation of erroneous positioning information in devices like smartphones and IoT devices, especially in enclosed or urban environments.
Innovation Solution
Identify a time window of signal interference by monitoring GNSS signal amplitude drops and perform targeted interference mitigation actions, such as disregarding affected position information or adjusting wireless transmitter operations, using multiple GNSS systems, and setting a signal drop detection threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous GNSS signal monitoring is performed to detect interference, then positioning accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs periodic monitoring of GNSS signal amplitude at specific intervals rather than continuous monitoring. The controller checks signal amplitude at predefined time points, enabling detection of interference events while consuming less energy than continuous monitoring would require.
Solution Approach 2:
The system establishes detection thresholds and time window parameters in advance before actual monitoring begins. By pre-configuring the criteria for interference detection and the monitoring schedule, the system prepares the detection mechanism to activate only when needed, reducing unnecessary energy consumption during normal operation.
2Measurement precision
If interference mitigation actions are performed continuously, then positioning accuracy is improved, but loss of time increases
Solution Approach 1:
Interference mitigation actions are triggered periodically only when signal amplitude drops below the threshold within defined time windows, rather than continuously. This selective periodic intervention maintains accuracy during interference events while minimizing time loss during normal signal conditions.
Solution Approach 2:
The system applies mitigation actions partially - only when and where interference is detected - rather than applying continuous mitigation. By using partial action targeted at specific interference events, the system maintains accuracy where needed while avoiding unnecessary time loss during periods of good signal quality.
3Reliability
If signal amplitude monitoring is implemented to detect interference, then reliability is improved, but device complexity increases
Solution Approach 1:
The GNSS receiver itself performs the signal amplitude monitoring and interference detection functions using its existing signal processing capabilities. The system leverages the receiver's inherent ability to process GNSS signals to also detect interference, eliminating the need for separate dedicated monitoring hardware and reducing overall system complexity.
Solution Approach 2:
The GNSS receiver is designed to perform multiple functions: both standard positioning operations and interference detection through signal amplitude monitoring. By making the receiver universal and capable of handling both tasks, the system improves reliability without adding separate dedicated components, thus avoiding increased device complexity.
Data Source
AI summary
An example method to mitigate interference in a position determination operation can include obtaining one or more global navigation satellite system (GNSS) signals; identifying a time window associated with a wireless signal transmitted by a wireless transmitter; and performing at least one interference mitigation action based on detecting a drop in signal amplitude of at least one of the one or more GNSS signals during the time window.