Adaptive Frequency Hopping Against Jamming Without Capability Exposure
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Solution Overview
Problem
Existing frequency hopping communication systems are vulnerable to intentional and unintentional signal interferers, which can degrade or disrupt communications, and existing countermeasures may reveal hardware limitations to jammers, making them easier to neutralize.
Innovation Solution
A communication system with a controller that dynamically adjusts the hopping rate and hopping frequency window based on detected interference, keeping these parameters below hardware and policy limits to conceal device capabilities from jammers, and adaptively responds to interference by increasing or decreasing these parameters as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hopping rate and hopping frequency window are set at maximum hardware capabilities, then the communication system can achieve maximum anti-jamming capability, but the hardware limitations become exposed to jammers making them easier to neutralize
Solution Approach 1:
The patent applies dynamics by making the hopping rate and hopping frequency window adjustable and adaptive rather than fixed at maximum hardware capabilities. The controller dynamically modifies these parameters based on detected interference conditions, allowing the system to maintain high anti-jamming performance when needed while concealing true hardware limitations by operating below maximum capacity during normal conditions.
Solution Approach 2:
The patent changes the parameters of hopping rate and hopping frequency window from fixed maximum values to variable values that can be adjusted by the controller. This allows the system to optimize performance by selecting appropriate parameter levels based on interference detection, thereby maintaining reliability while preventing exposure of hardware capabilities to potential jammers.
2Reliability
If adaptive modulation increases the spread spectrum spreading rate to counter jamming, then the signal robustness improves, but the data rate decreases
Solution Approach 1:
Instead of changing modulation parameters that affect data rate, the patent changes the frequency hopping parameters (hopping rate and frequency window) to achieve anti-jamming performance. This approach maintains signal robustness through frequency diversity while preserving the original data rate by not modifying the spread spectrum spreading rate or constellation robustness.
Data Source
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AI summary
A communication system may include a radio frequency (RF) detector and an RF transmitter having a selectable hopping rate and a selectable hopping frequency window. A controller may be configured to operate the RF transmitter at a selected hopping rate and at a selected hopping frequency window based upon the RF detector.