Accession Number : ADA267176


Title :   Operation of Digital Systems in Severe Electromagnetic Environments


Descriptive Note : Final rept.,


Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV NEW LONDON CT NEW LONDON DETACHMENT


Personal Author(s) : Kowalczyk, K R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267176.pdf


Report Date : 11 Jun 1993


Pagination or Media Count : 40


Abstract : New digital communication between units is desired in the modernization of a system. Two units of an existing system are linked by circuitry that supplies direct current power, and the connecting wires have been selected for conversion to digital use. This wiring is located within a large bank of alternating current power cables and runs parallel to these cables for several hundred feet. The direct current system realizes no interference from this physical configuration, however, the power wiring radiates electromagnetic fields sufficient to couple noise voltage into a digital system. This project quantifies the effects of high levels of low frequency electromagnetic fields on standard digital communications wiring so that a sufficiently immune circuit configuration can be selected for any applications. A model of the expected electromagnetic environment is presented and wire termination voltage measurements are made under varying field and impedance conditions. Standard digital communication design is then examined for compatibility with this environment.


Descriptors :   *DIGITAL SYSTEMS , *DIGITAL COMMUNICATIONS , *ELECTROMAGNETIC ENVIRONMENTS , ELECTROMAGNETIC FIELDS , CABLES , LOW FREQUENCIES , DIRECT CURRENT , INTERFERENCE , CIRCUITS , IMPEDANCE


Subject Categories : Electrical and Electronic Equipment
      Radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE