Jamming Signal Jitter Modulation for Covert Friendly Communication
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Solution Overview
Problem
Conventional jamming techniques often inadvertently prevent friendly systems from using the same bandwidths, as they attempt to distinguish between jamming and communication signals, which can be compromised by adversaries detecting timing or frequency separations.
Innovation Solution
Modulating communication data onto a jamming signal by varying pulse parameters such as bandwidth, center frequency, and pulse width, making the signal appear as noise to adversaries while allowing allies to detect the embedded data, thereby maintaining jamming effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional jamming techniques are used to block adversary communications, then jamming effectiveness is improved, but friendly systems are prevented from using the same bandwidths
Solution Approach 1:
The patent combines jamming and communication functions into a single signal by modulating communication data onto the jamming waveform. The jammer transmits a signal that simultaneously jams the adversary's communication band while embedding communication data that friendly systems can extract and decode, thereby eliminating the need for separate jamming and communication channels.
Solution Approach 2:
The jamming signal is designed to perform multiple functions: it blocks adversary communications through spectral overlap while simultaneously carrying encoded communication data for friendly systems. The modulated jamming waveform serves both as a denial tool and a communication carrier, making the jammer a multi-functional device.
2Productivity
If time or frequency separation is used to allow communication during jamming, then friendly communication is enabled, but the adversary can use the same technique to communicate
Solution Approach 1:
The patent applies different characteristics to different parts of the jamming signal. Communication data is embedded in specific portions or aspects of the jamming waveform (such as variations in pulse width, frequency, or phase) that are detectable by friendly systems with the appropriate decoding key, while appearing as random noise to adversaries. This localized embedding ensures secure communication without creating detectable separation patterns.
3Loss of information
If communication data is modulated onto jamming signal by varying pulse parameters, then secure communication is achieved, but jamming effectiveness may be reduced
Solution Approach 1:
The patent modulates communication data by dynamically changing parameters of the jamming signal such as pulse width, frequency, or phase. These parameter variations encode the communication data within the jamming waveform while maintaining the signal's overall characteristics as effective jamming. The modulations are designed to be subtle enough to preserve jamming effectiveness but sufficient for friendly systems to detect and decode the embedded data.
Data Source
AI summary
Methods and apparatus to determine a level of inherent jitter for signals from a transmitter and a receiver, and modulate information onto a signal transmitted by the transmitter by using spot jitter (with bandwidth and center frequency modulation) and/or pulse width jitter in a region outside of a data region with inherent jitter to carry communication between systems.