Difference-Based Jammer Detection Using Beam and Null Comparison
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Solution Overview
Problem
Direction finding techniques for jammer signals often produce false alarms, distracting from real threats and burdening processing systems and operators, and existing multi-platform solutions add complexity and cost, requiring coordination that may not be feasible in hostile environments.
Innovation Solution
A jammer detection system that uses difference-based detection methods, leveraging the power difference between steered beams and adaptive nulls to distinguish actual jammers from false alarms, without requiring information from other platforms, and allows for threshold adjustments to balance false alarm and detection probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direction finding techniques are used to detect jammer signals, then jammer detection capability is improved, but false alarm rate increases
Solution Approach 1:
The patent changes the detection parameter from simple signal power thresholding to power difference calculation between steered beam and adaptive null. This parameter transformation allows the system to distinguish actual jammers from false alarms by exploiting the characteristic that real jammers produce significant power differences while false alarms do not
Solution Approach 2:
The patent introduces an adaptive null as an intermediary element to compare against the steered beam power. This null acts as a reference that cancels out background interference and false alarm signals, allowing the power difference to selectively highlight actual jammer signals
2Reliability
If multiple cooperating DF platforms are deployed to improve detection reliability, then detection accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent extracts the essential function of multi-platform cooperation (improved detection reliability) and implements it within a single platform using internal signal processing. The adaptive nulling technique extracts and cancels interference components locally, eliminating the need for external platform coordination while achieving similar reliability improvements
Solution Approach 2:
The patent makes the single sensor platform perform multiple functions: direction finding, interference cancellation, and jammer detection. The adaptive nulling circuit serves multiple purposes by simultaneously reducing background noise and providing a reference for false alarm rejection, thereby consolidating what would otherwise require multiple specialized platforms
3Reliability
If multiple cooperating DF platforms are deployed to improve detection reliability, then detection accuracy is improved, but coordination requirements increase
Solution Approach 1:
The patent extracts the detection reliability function from multi-platform coordination and implements it through local adaptive processing. By taking out the need for inter-platform communication and coordination, the system achieves the same reliability improvement through self-contained signal processing operations
Data Source
AI summary
Techniques are provided for jammer detection. A methodology implementing the techniques according to an embodiment includes steering a beam in a specified direction to generate a power measurement, the specified direction selected from a plurality of directions, such that the method comprises scanning through the plurality of directions. The method also includes adaptively steering a null in the specified direction and measuring a gain of the received signal in the null direction. The method further includes calculating a difference between the power measurement and the measured gain and generating a difference-based detection that the received signal is associated with a jammer at the specified direction. The difference-based detection is based on a comparison of the power difference to a power difference threshold value. The power difference threshold value is based on a desired probability of false alarm and probability of detection, and/or desired angular resolution.