Frequency Agile Anti-Jam Data Link for Airborne Communications
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Solution Overview
Problem
Current communication systems for airborne vehicles face challenges in minimizing signal attenuation and jamming, particularly as the distance and coverage area increase, leading to potential exposure of sensitive information and vulnerability to countermeasures.
Innovation Solution
The system employs frequency agile communications by selecting transmission frequencies near atmospheric absorption bands to control signal attenuation, ensuring intended recipients receive messages while preventing unintended recipients and jamming signals from doing so, utilizing small frequency adjustments to maximize signal directionality and minimize ground-based jammer effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission frequency is set to minimize atmospheric attenuation, then communication range and data rate are maximized, but vulnerability to jamming and signal interception increases
Solution Approach 1:
The system dynamically adjusts transmission frequency based on atmospheric conditions and threat environment. The frequency is not fixed but varies over time and space, allowing the communication link to adapt to changing attenuation characteristics while maintaining reliability and reducing jamming vulnerability through frequency agility.
Solution Approach 2:
The invention changes the transmission frequency parameter to operate near atmospheric absorption bands rather than at frequencies that minimize attenuation. This parameter change exploits the exponential decay of signal strength with distance in absorption bands to provide secure, short-range communication while maintaining adequate signal-to-noise ratio for intended recipients.
2Reliability
If high power transmission is used to ensure received signal strength, then communication reliability improves, but signal interception by unintended recipients increases
Solution Approach 1:
The system creates a localized communication environment by operating in an atmospheric absorption band where signal attenuation is highly distance-dependent. High power transmission is used locally near the transmitter where the intended recipient operates, while the signal naturally decays to undetectable levels at greater distances, providing inherent security without sacrificing local signal-to-noise ratio.
Solution Approach 2:
The invention converts the harmful effect of atmospheric absorption into a beneficial security feature. The same atmospheric conditions that cause signal attenuation are exploited to create a secure communication zone, where the natural decay of the signal provides both the needed signal strength for reliable communication and automatic security against distant interception.
3Object-affected harmful factors
If frequency hopping or spread spectrum techniques are used to resist jamming, then jamming resistance improves, but bandwidth requirements increase and effectiveness decreases at high data rates
Solution Approach 1:
The system extracts and exploits the natural atmospheric absorption characteristic to provide jamming resistance without requiring complex spread spectrum or frequency hopping techniques. By operating in an absorption band, the signal naturally decays with distance, providing passive security and jamming resistance that does not consume additional bandwidth or reduce data rate efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides secure, directed communication links with high signal-to-noise ratios for intended recipients while suppressing signals beyond the intended range and reducing jamming effectiveness, thereby enhancing the security and reliability of airborne vehicle communications.
Implementation Method 1
signals at or around 60 GHz within the 40-75 V-band are readily absorbed in the atmosphere. Particularly, oxygen molecules (O2) in the air have electron orbits including resonant frequencies at or around 60 GHz that cause radiation at 60 GHz to be absorbed in the atmosphere
Implementation Method 2
oxygen molecules (O2) in the air have electron orbits including resonant frequencies at or around 60 GHz that cause radiation at 60 GHz to be absorbed in the atmosphere
Implementation Method 3
The frequency of the data link is moved around the absorption band so that less attenuation occurs, thereby extending the distance over which messages can be sent
Data Source
AI summary
A method for sending messages through the atmosphere. The method includes sending the messages to an intended recipient, such as an aircraft, on a data link over an operating frequency at or near an atmospheric absorption band, where the operating frequency is selected to be closer to or farther from the absorption band to control the attenuation of the messages in the atmosphere so that the intended recipient is able to receive the messages, but unintended recipients are unable to receive the messages or jamming signals are unable to jam the messages.