Frequency-Encoded Beacons for Covert Dismount Identification
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Solution Overview
Problem
Current beacon technology used by dismounted soldiers is detectable by night vision goggles and photomultiplier tubes, making friendly forces susceptible to detection by adversarial forces, which compromises covert operations.
Innovation Solution
The implementation of frequency-encoded beacons with modulation frequencies greater than 60 Hz and wavelengths above 700 nm, utilizing high-speed detectors like Geiger-mode avalanche photodiodes or digital focal plane arrays, to encode and decode signals undetectable by human eyes or conventional night vision goggles, ensuring covert identification and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beacons use standard near-infrared wavelengths detectable by night vision goggles, then identification and tracking of friendly forces is achieved, but adversarial forces can also detect and locate friendly forces
Solution Approach 1:
The patent changes the wavelength parameter of the beacon signal to the visible red spectrum (610-700 nm) and implements frequency modulation with codes above 60 Hz. This parameter transformation makes the beacon undetectable by conventional night vision goggles while remaining visible to the human eye and detectable by specialized receivers, thereby resolving the contradiction between reliable identification and vulnerability to adversarial detection.
2Reliability
If beacons emit continuous visible light, then friendly forces are easily identifiable, but the beacon becomes detectable by adversaries and wastes energy
Solution Approach 1:
The patent implements periodic modulation of the beacon signal using coded frequency patterns above 60 Hz with specific duty cycles. The beacon emits light in pulsed sequences rather than continuously, creating a modulated signal that encodes identification information. This periodic action enables reliable identification through pattern recognition while significantly reducing overall energy consumption compared to continuous emission.
3Loss of information
If modulation frequency is increased above 60 Hz to encode information, then covert communication is achieved, but the signal becomes undetectable by conventional night vision equipment
Solution Approach 1:
The patent introduces a specialized receiver device as an intermediary that can detect and demodulate the high-frequency coded signals (above 60 Hz). This receiver acts as a mediator between the modulated beacon signal and the observer, enabling extraction of identification information from the frequency-coded signal that is invisible to conventional night vision goggles, thus resolving the contradiction between information encoding and detection difficulty.
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
The system allows for covert identification and communication of friendly forces while remaining undetectable by adversaries beyond a certain range, enabling secure command and control, surveillance, and reconnaissance operations without being detected by enemy forces.
Implementation Method 1
The receiver may be a Geiger-mode avalanche photodiode receiver
Implementation Method 2
Night Vision Goggles (NVG) which typically utilizes photomultipliers tubes. These NVG are standard equipment and have sensitivity to near infrared (NIR) radiation
Data Source
AI summary
The system and method for frequency encoded beacons for use in covert dismount identification, friend or foe and communications. Waveforms are capped at thresholds below human and conventional night vision detection. Waveforms are further modulated to identify dismounts as well as other information such as day and time, rank, health status, and the like. The beacons may operate at different wavelengths depending on whether they are used on ground, in air, or at sea.