Transverse Electric Waves for VLF/LF Communication between Aircraft.
This report compares the excitation and propagation of VLF/LF transverse electric (TE) and transverse magnetic (TM) long waves in the earth-ionosphere waveguide. It calculates the dependence of TE and TM mode parameters on three factors: (1) ground conductivity, (2) state of the ionosphere, and (3)...
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ftdtic:ADA115834 2023-05-15T16:28:32+02:00 Transverse Electric Waves for VLF/LF Communication between Aircraft. Field,E C , Jr PACIFIC-SIERRA RESEARCH CORP SANTA MONICA CA 1981-11 text/html http://www.dtic.mil/docs/citations/ADA115834 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA115834 en eng http://www.dtic.mil/docs/citations/ADA115834 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Radio Countermeasures Radiofrequency Wave Propagation Radio Communications *Radio links *Aircraft antennas *Ionospheric propagation *Trailing wire antennas *Electric fields Horizontal orientation Air to air Long wavelengths Low frequency Very low frequency Radio transmitters Parameters Intensity Ionosphere Transverse waves Electrical conductivity Radio jamming Noise Ionospheric disturbances Transmitters Canada Greenland Atmospheres State of the art Ground level Conversion(Geomagnetic) WUNR089156 Text 1981 ftdtic 2016-02-19T08:06:43Z This report compares the excitation and propagation of VLF/LF transverse electric (TE) and transverse magnetic (TM) long waves in the earth-ionosphere waveguide. It calculates the dependence of TE and TM mode parameters on three factors: (1) ground conductivity, (2) state of the ionosphere, and (3) elevation of terminals above the ground. It also briefly addresses the effects of atmospheric noise and ground-based jammers on the performance of TE links. Results are given for frequencies between 20 and 50 kHz. Only TM signals are efficiently radiated by ground-based transmitters. However, TE signals are strongly excited by nearly horizontal trailing-wire antennas at elevations exceeding 20 kft and, thus, can be important for air-to-air links. Poorly conducting ground heavily degrades TM propagation, but it will not affect TE propagation if the terminals are elevated at least 5000 ft. TE signals are, therefore, better suited than TM signals for air-to-air links that traverse Greenland and much of Canada. For paths over highly conducting ground, TM signals suffer less degradation than TE signals during intense disturbances; for ground conductivities less than about .0001 mhos/m, however, TM signals are more adversely affected. TE signals also provide protection against ground-based jammers under disturbed ionospheric conditions where geomagnetic conversion is slight. (Author) Text Greenland Defense Technical Information Center: DTIC Technical Reports database Canada Greenland |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Radio Countermeasures Radiofrequency Wave Propagation Radio Communications *Radio links *Aircraft antennas *Ionospheric propagation *Trailing wire antennas *Electric fields Horizontal orientation Air to air Long wavelengths Low frequency Very low frequency Radio transmitters Parameters Intensity Ionosphere Transverse waves Electrical conductivity Radio jamming Noise Ionospheric disturbances Transmitters Canada Greenland Atmospheres State of the art Ground level Conversion(Geomagnetic) WUNR089156 |
spellingShingle |
Radio Countermeasures Radiofrequency Wave Propagation Radio Communications *Radio links *Aircraft antennas *Ionospheric propagation *Trailing wire antennas *Electric fields Horizontal orientation Air to air Long wavelengths Low frequency Very low frequency Radio transmitters Parameters Intensity Ionosphere Transverse waves Electrical conductivity Radio jamming Noise Ionospheric disturbances Transmitters Canada Greenland Atmospheres State of the art Ground level Conversion(Geomagnetic) WUNR089156 Field,E C , Jr Transverse Electric Waves for VLF/LF Communication between Aircraft. |
topic_facet |
Radio Countermeasures Radiofrequency Wave Propagation Radio Communications *Radio links *Aircraft antennas *Ionospheric propagation *Trailing wire antennas *Electric fields Horizontal orientation Air to air Long wavelengths Low frequency Very low frequency Radio transmitters Parameters Intensity Ionosphere Transverse waves Electrical conductivity Radio jamming Noise Ionospheric disturbances Transmitters Canada Greenland Atmospheres State of the art Ground level Conversion(Geomagnetic) WUNR089156 |
description |
This report compares the excitation and propagation of VLF/LF transverse electric (TE) and transverse magnetic (TM) long waves in the earth-ionosphere waveguide. It calculates the dependence of TE and TM mode parameters on three factors: (1) ground conductivity, (2) state of the ionosphere, and (3) elevation of terminals above the ground. It also briefly addresses the effects of atmospheric noise and ground-based jammers on the performance of TE links. Results are given for frequencies between 20 and 50 kHz. Only TM signals are efficiently radiated by ground-based transmitters. However, TE signals are strongly excited by nearly horizontal trailing-wire antennas at elevations exceeding 20 kft and, thus, can be important for air-to-air links. Poorly conducting ground heavily degrades TM propagation, but it will not affect TE propagation if the terminals are elevated at least 5000 ft. TE signals are, therefore, better suited than TM signals for air-to-air links that traverse Greenland and much of Canada. For paths over highly conducting ground, TM signals suffer less degradation than TE signals during intense disturbances; for ground conductivities less than about .0001 mhos/m, however, TM signals are more adversely affected. TE signals also provide protection against ground-based jammers under disturbed ionospheric conditions where geomagnetic conversion is slight. (Author) |
author2 |
PACIFIC-SIERRA RESEARCH CORP SANTA MONICA CA |
format |
Text |
author |
Field,E C , Jr |
author_facet |
Field,E C , Jr |
author_sort |
Field,E C , Jr |
title |
Transverse Electric Waves for VLF/LF Communication between Aircraft. |
title_short |
Transverse Electric Waves for VLF/LF Communication between Aircraft. |
title_full |
Transverse Electric Waves for VLF/LF Communication between Aircraft. |
title_fullStr |
Transverse Electric Waves for VLF/LF Communication between Aircraft. |
title_full_unstemmed |
Transverse Electric Waves for VLF/LF Communication between Aircraft. |
title_sort |
transverse electric waves for vlf/lf communication between aircraft. |
publishDate |
1981 |
url |
http://www.dtic.mil/docs/citations/ADA115834 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA115834 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA115834 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766018185917628416 |