Jamming Signal Bandwidth Modulation for Covert Friendly Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional communication methods during jamming fail to distinguish between friendly and adversary signals, as they often require separating signals in time or frequency domains, making it difficult to maintain communication while jamming without revealing the communication technique to the adversary.
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 and enabling secure communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional signal separation techniques (time or frequency domain) are used to enable communication during jamming, then communication capability is improved, but jamming effectiveness deteriorates because the adversary can also use the same technique to communicate
Solution Approach 1:
The patent applies local quality by embedding communication data in specific local features of the jamming signal (pulse width variations, frequency shifts, or phase modulations) while maintaining the overall jamming characteristics. This allows friendly receivers to detect these localized modifications for data extraction while adversaries continue to perceive the signal as effective jamming noise.
Solution Approach 2:
The patent inverts the conventional approach by using the jamming signal itself as the communication carrier rather than separating communication from jamming. Instead of creating a separate communication channel, the invention modulates communication data onto the jamming waveform parameters, turning the harmful jamming signal into a dual-purpose signal that simultaneously jams adversaries and communicates with friendly forces.
2Reliability
If a narrow bandwidth is left unjammed for communication, then communication reliability is improved, but the bandwidth available for effective jamming is reduced
Solution Approach 1:
The patent merges the jamming and communication functions into a single signal by modulating communication data onto the jamming waveform. This combination allows the full bandwidth to be used for jamming while embedding communication information within the same signal, eliminating the need to reserve separate bandwidth for communication.
Solution Approach 2:
The patent makes the jamming signal multi-functional by enabling it to simultaneously perform jamming against adversaries and carry communication data for friendly forces. The single signal serves dual purposes: maintaining jamming effectiveness across the full bandwidth while encoding communication information through controlled modifications of signal parameters.
3Productivity
If communication data is embedded in the jamming signal by modulating pulse parameters, then spectrum efficiency is improved, but the complexity of signal processing increases
Solution Approach 1:
The patent employs parameter changes by modulating communication data through variations in pulse width, frequency, or phase of the jamming signal. These parameter modulations encode communication information while maintaining the signal's primary jamming function, allowing efficient use of the spectrum through the same transmitted waveform.
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.