Near field magnetic communications for helmet-mounted display applications

Mark Field; Alan Sailer

doi:10.1117/12.604188

19 May 2005 Near field magnetic communications for helmet-mounted display applications

Mark Field, Alan Sailer

Proceedings Volume 5800, Helmet- and Head-Mounted Displays X: Technologies and Applications; (2005) https://doi.org/10.1117/12.604188
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Helmet-mounted displays need a data feed that is typically provided by a cable or RF wireless data link to an external computer. In defense applications these solutions are problematic: a cable gets in the way and restricts use and emergency egress, while an RF wireless link can be detected at some distance giving away position and is susceptible to jamming. What is required is an alternative wireless technology that is low power, extremely localized and difficult to detect or jam. Near field magnetic communications is one possible alternative to RF communications that may fulfill these needs. This technology uses a time varying magnetic field to carry information, and is only useable over small distances of order six feet. This is expected to have significant advantages for particular applications: notably power requirements and security compared with RF wireless links. The power stored in a magnetic field falls off as 1/r6, compared with 1/r2 for RF, which means that all the power is localized around the transmitter. By having a physically small communications region around each platform or user, a large bandwidth can be guaranteed by allowing the reuse of the frequency spectrum outside the immediate vicinity. It also confers security on the data-link, as the signal is undetectable beyond the short range of the system.

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Mark Field and Alan Sailer "Near field magnetic communications for helmet-mounted display applications", Proc. SPIE 5800, Helmet- and Head-Mounted Displays X: Technologies and Applications, (19 May 2005); https://doi.org/10.1117/12.604188

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Magnetism

Video

Antennas

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Signal detection

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