Jamming Detection via Signal Distribution Deviation
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Solution Overview
Problem
CDMA-like receivers, such as GNSS systems, face signal degradation and accuracy issues due to jamming from various sources, which existing automatic gain control (AGC) circuits struggle to address effectively, leading to power wastage as anti-jamming operations are often activated during jamming-free periods.
Innovation Solution
A jamming detection scheme that compares the amplitude or power distribution of received signals with a reference distribution, using counters to measure deviations from a predetermined signal model, such as Gaussian, to accurately determine the presence of jamming and activate anti-jamming operations only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-jamming operation is always activated, then signal integrity is maintained, but power consumption increases significantly
Solution Approach 1:
The anti-jamming operation is made dynamic by continuously monitoring signal characteristics and adapting the anti-jamming function's activation state based on real-time jamming detection, transitioning from static always-on operation to dynamic conditional operation
Solution Approach 2:
A feedback mechanism is implemented where the signal distribution characteristics are continuously measured and fed back to the jamming detection module, which then adjusts the anti-jamming operation activation accordingly, creating a closed-loop control system
2Reliability
If anti-jamming operation is always activated, then jamming resistance is improved, but device complexity increases
Solution Approach 1:
The anti-jamming system is segmented into distinct functional modules: signal distribution detection, reference distribution comparison, jamming determination, and anti-jamming operation activation, allowing independent optimization and simplified control of each segment
Solution Approach 2:
A jamming detection module serves as an intermediary between the signal input and anti-jamming operation, mediating the decision-making process by analyzing signal characteristics and controlling when anti-jamming functions should be activated
3Ease of operation
If AGC circuit uses predetermined signal model, then operating range optimization is achieved, but performance degrades under jamming conditions
Solution Approach 1:
The system changes the parameter being monitored from simple signal strength (used by traditional AGC) to signal distribution characteristics, allowing the AGC to maintain its predetermined model for normal operation while the jamming detection system uses distribution analysis to detect anomalies
Data Source
AI summary
A jamming detector and jamming detecting method are disclosed. In accordance with the present invention, distribution of a received signal is compared with a reference distribution of a specific signal model. Deviation of the signal distribution from the reference distribution can be obtained according to the comparison results. The existence of jamming is determined according to the deviation. If the signal distribution significantly deviates from the reference distribution, it means that jamming exists. An anti-jamming circuit or algorithm can be activated only when jamming is detected, thereby power consumption is reduced.