TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS.
High-frequency ionospheric propagation conditions over the 3820-km transauroral Thule-Norwood path were investigated to identify propagation anomalies and reveal their origins in terms of the geophysical environment. Three investigative techniques were employed: (1) step-frequency oblique-incidence...
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ftdtic:AD0620696 2023-05-15T15:08:56+02:00 TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. Roberts,Frank R. RAYTHEON CO NORWOOD MASS 1965-04 text/html http://www.dtic.mil/docs/citations/AD0620696 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0620696 en eng http://www.dtic.mil/docs/citations/AD0620696 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS (*IONOSPHERIC PROPAGATION RADIO SIGNALS) (*RADIO SIGNALS IONOSPHERIC PROPAGATION) ATMOSPHERICS AURORAE ARCTIC REGIONS HIGH FREQUENCY RADIO TRANSMISSION RADIOFREQUENCY PULSES MULTIPATH TRANSMISSION IONOSPHERE ELECTROMAGNETIC WAVE REFLECTIONS RADIOFREQUENCY SPECTROSCOPY SPECTRUM ANALYZERS RADIO EQUIPMENT GREENLAND MASSACHUSETTS Text 1965 ftdtic 2016-02-18T18:38:30Z High-frequency ionospheric propagation conditions over the 3820-km transauroral Thule-Norwood path were investigated to identify propagation anomalies and reveal their origins in terms of the geophysical environment. Three investigative techniques were employed: (1) step-frequency oblique-incidence sounding; (2) spectrum analysis of 17.7mc signals originating from a frequency-stable transmitter; (3) and film-recording the multipath structure of 17.7-mc pulsed signals transmitted from a continuously rotating directional antenna. The third technique, in addition to providing relative time delays of multipath components, also furnishes the bearing of the signal transmitted from Thule. Propagation at the frequency of primary interest (17.7mc) is predominately via the classical one- and two-hop Flayer modes, although, during the summer months, multihop E sub s modes are observed, particularly at night. The limited available signal-spectrum data suggest that the classical one-hop F-layer signal is often characterized, on magnetically quiet days, by a spread of doppler frequencies of the order of 9.4 cps, or greater, a value substantially greater than the 1/2 to 1 cps observed on temperate latitude paths under similar magnetic conditions. An F-layer ionospheric scatter process is the suggested explanation. (Author) See also AD-620 683. Text Arctic Greenland Thule Defense Technical Information Center: DTIC Technical Reports database Arctic Greenland |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
(*IONOSPHERIC PROPAGATION RADIO SIGNALS) (*RADIO SIGNALS IONOSPHERIC PROPAGATION) ATMOSPHERICS AURORAE ARCTIC REGIONS HIGH FREQUENCY RADIO TRANSMISSION RADIOFREQUENCY PULSES MULTIPATH TRANSMISSION IONOSPHERE ELECTROMAGNETIC WAVE REFLECTIONS RADIOFREQUENCY SPECTROSCOPY SPECTRUM ANALYZERS RADIO EQUIPMENT GREENLAND MASSACHUSETTS |
spellingShingle |
(*IONOSPHERIC PROPAGATION RADIO SIGNALS) (*RADIO SIGNALS IONOSPHERIC PROPAGATION) ATMOSPHERICS AURORAE ARCTIC REGIONS HIGH FREQUENCY RADIO TRANSMISSION RADIOFREQUENCY PULSES MULTIPATH TRANSMISSION IONOSPHERE ELECTROMAGNETIC WAVE REFLECTIONS RADIOFREQUENCY SPECTROSCOPY SPECTRUM ANALYZERS RADIO EQUIPMENT GREENLAND MASSACHUSETTS Roberts,Frank R. TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. |
topic_facet |
(*IONOSPHERIC PROPAGATION RADIO SIGNALS) (*RADIO SIGNALS IONOSPHERIC PROPAGATION) ATMOSPHERICS AURORAE ARCTIC REGIONS HIGH FREQUENCY RADIO TRANSMISSION RADIOFREQUENCY PULSES MULTIPATH TRANSMISSION IONOSPHERE ELECTROMAGNETIC WAVE REFLECTIONS RADIOFREQUENCY SPECTROSCOPY SPECTRUM ANALYZERS RADIO EQUIPMENT GREENLAND MASSACHUSETTS |
description |
High-frequency ionospheric propagation conditions over the 3820-km transauroral Thule-Norwood path were investigated to identify propagation anomalies and reveal their origins in terms of the geophysical environment. Three investigative techniques were employed: (1) step-frequency oblique-incidence sounding; (2) spectrum analysis of 17.7mc signals originating from a frequency-stable transmitter; (3) and film-recording the multipath structure of 17.7-mc pulsed signals transmitted from a continuously rotating directional antenna. The third technique, in addition to providing relative time delays of multipath components, also furnishes the bearing of the signal transmitted from Thule. Propagation at the frequency of primary interest (17.7mc) is predominately via the classical one- and two-hop Flayer modes, although, during the summer months, multihop E sub s modes are observed, particularly at night. The limited available signal-spectrum data suggest that the classical one-hop F-layer signal is often characterized, on magnetically quiet days, by a spread of doppler frequencies of the order of 9.4 cps, or greater, a value substantially greater than the 1/2 to 1 cps observed on temperate latitude paths under similar magnetic conditions. An F-layer ionospheric scatter process is the suggested explanation. (Author) See also AD-620 683. |
author2 |
RAYTHEON CO NORWOOD MASS |
format |
Text |
author |
Roberts,Frank R. |
author_facet |
Roberts,Frank R. |
author_sort |
Roberts,Frank R. |
title |
TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. |
title_short |
TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. |
title_full |
TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. |
title_fullStr |
TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. |
title_full_unstemmed |
TRANSAURORAL HIGH FREQUENCY RADIO PROPAGATION. VOLUME II. SIGNAL MODE ANALYSIS. |
title_sort |
transauroral high frequency radio propagation. volume ii. signal mode analysis. |
publishDate |
1965 |
url |
http://www.dtic.mil/docs/citations/AD0620696 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0620696 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Thule |
genre_facet |
Arctic Greenland Thule |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0620696 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766340191998443520 |