Ultraviolet communication for secure networks

Date:
August 11, 2020
Source:
U.S. Army Research Laboratory
Summary:
Of ever-increasing concern for operating a tactical communications
network is the possibility that a sophisticated adversary may
detect friendly transmissions. Researchers developed an analysis
framework that enables the rigorous study of the detectability of
ultraviolet communication systems, providing the insights needed
to deliver the requirements of future, more secure networks.



FULL STORY ==========================================================================
Of ever-increasing concern for operating a tactical communications
network is the possibility that a sophisticated adversary may detect
friendly transmissions. Army researchers developed an analysis framework
that enables the rigorous study of the detectability of ultraviolet communication systems, providing the insights needed to deliver the requirements of future, more secure Army networks.


==========================================================================
In particular, ultraviolet communication has unique propagation
characteristics that not only allow for a novel non-line-of-sight optical
link, but also imply that the transmissions may be harder for an adversary
to detect.

Building off of experimentally validated channel modeling, channel
simulations, and detection and estimation theory, the developed framework enables the evaluation of tradeoffs associated with different design
choices and the manner of operation of ultraviolet communication systems,
said Dr. Robert Drost of the U.S. Army Combat Capabilities Development Command's Army Research Laboratory.

"While many techniques have been proposed to decrease the detectability
of conventional radio-frequency, or RF, communications, the
increased atmospheric absorption of deep-ultraviolet wavelengths
implies that ultraviolet communication, or UVC, has a natural low-probability-of-detection, or LPD, characteristic," Drost said.

"In order to fully take advantage of this characteristic, a rigorous understanding of the LPD properties of UVC is needed." In particular,
Drost said, such understanding is essential for optimizing the design
and operation of UVC systems and networks and for predicting the quality
of the LPD property in a given scenario, such as using UVC to securely
network a command post that has an estimate of the direction and distance
to the adversary.



========================================================================== Without such a predictive capability, he said, users would lack the
guidance needed to know the extent and limit of their detectability,
and this lack of awareness would substantially limit the usefulness of
the LPD capability.

The researchers, including Drs. Mike Weisman, Fikadu Dagefu, Terrence
Moore and Drost from CCDC ARL and Dr. Hakan Arlsan, Oak Ridge Associated Universities postdoctoral fellow at the lab, demonstrated this by
applying their framework to produce a number of key insights regarding
the LPD characteristics of UVC, including: LPD capability is relatively insensitive to a number of system and channel properties, which is
important for the robustness of the LPD property Adversarial line-of-sight detection of a non-line-of-sight communication link is not as significant
of a concern as one might fear Perhaps counter to intuition, steering of
a UVC transmitter does not appear to be an effective detection-mitigation strategy in many cases Line-of-sight UVC link provides non-line-of-sight standoff distances that are commensurate with the communication range
Prior modeling and experimental research has demonstrated that UVC signals attenuate dramatically at long distance, leading to the hypothesis that
UVC has a fundamental LPD property, Drost said. However, there has been
little effort on rigorously and precisely quantifying this property in
terms of the detectability of a communication signal.

"Our work provides a framework enabling the study of the fundamental
limits of detectability for an ultraviolet communication system meeting
desired communication performance requirements," Drost said.



========================================================================== Although this research is focused on longer-term applications, he said, it
is addressing the Army Modernization Priority on Networks by developing
the fundamental understanding of a novel communications capability,
with a goal of providing the Soldier with network connectivity despite challenging environments that include adversarial activity.

"The future communications and networking challenges that the Army faces
are immense, and it is essential that we explore all possible means
to overcoming those challenges," Drost said. "Our research is ensuring
that the community has the fundamental understanding of the potential
for and limitations of using ultraviolet wavelengths for communications,
and I am confident that this understanding will inform the development of future Army networking capabilities. Conducting fundamental research that impacts decision making and Army technologies is why we work for the Army,
and it is very satisfying to know that our work will ultimately support
the warfighter in his or her mission." The researchers are currently continuing to develop refined understanding of how best to design and
operate ultraviolet communications, and an important next step is the application of this framework to understand the detectability of a
network of ultraviolet communications systems.

Another key effort involves the experimental characterization, exploration
and demonstration of this technology in a practical network using ARL's
Common Sensor Radio, a sophisticated mesh-networking radio designed to
provide robust and energy-efficient networking.

This research supports the laboratory's FREEDOM (Foundational Research
for Electronic Warfare in Multi-Domain Operations) Essential Research
Program goal of studying the integration of low-signature communications technologies with advanced camouflage and decoy techniques.

According to Drost, the work is also an on-ramp to studying how
ultraviolet communications and other communications modalities, including conventional radio-frequency communications, can operate together in
a seamless and autonomous extremely heterogeneous network, which the researchers believe is needed in order to fully realize the benefits of individual novel communication technologies.

As they make continued progress on these fundamental research
questions, the researchers will continue to work closely with their
transition partner at the CCDC C5ISR (Command, Control, Computers, Communications, Cyber, Intelligence, Surveillance and Reconnaissance)
Center to push ultraviolet communications toward nearer term transition
to the warfighter.


========================================================================== Story Source: Materials provided by U.S._Army_Research_Laboratory. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Michael J. Weisman, Fikadu T. Dagefu, Terrence J. Moore, C. Hakan
Arslan,
Robert J. Drost. Analysis of the low-probability-of-detection
characteristics of ultraviolet communications. Optics Express,
2020; 28 (16): 23640 DOI: 10.1364/OE.399196 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200811125047.htm

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