HF COMMUNICATION EFFECTS: PHASE-STABLE DATA REDUCTION TECHNIQUES AND SYSTEM TEST RESULTS

Data-reduction techniques are discussed for a phase-stable CW system. An experiment was conducted in which signals were received at a site near Palo Alto over a transauroral path from Thule, Greenland and over a mid-latitude path from Fort Monmouth, New Jersey. Fixed-frequency, 7.366-Mc phase-stable...

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Bibliographic Details
Main Authors: Shepherd, R. A., Tupper, B. C., Lomax, J. B.
Other Authors: STANFORD RESEARCH INST MENLO PARK CA
Format: Text
Language:English
Published: 1965
Subjects:
Radio Communications
*IONOSPHERIC PROPAGATION
*COMMUNICATION AND RADIO SYSTEMS
POLAR REGIONS
SCATTERING
HIGH FREQUENCY
PHASE STUDIES
HIGH ALTITUDE
AURORAE
ANALOG TO DIGITAL CONVERTERS
NOISE(RADIO)
DOPPLER EFFECT
VERY LOW FREQUENCY
FREQUENCY SHIFT KEYERS
PHASE SHIFT CIRCUITS
SIMULATION
DATA PROCESSING
NUCLEAR EXPLOSIONS
Greenland
Thule
Online Access:http://www.dtic.mil/docs/citations/AD0480293
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0480293
Description
Summary:Data-reduction techniques are discussed for a phase-stable CW system. An experiment was conducted in which signals were received at a site near Palo Alto over a transauroral path from Thule, Greenland and over a mid-latitude path from Fort Monmouth, New Jersey. Fixed-frequency, 7.366-Mc phase-stable data collected in analog form on magnetic tape during the field portion of the experiment were digitized and reduced on an IBM 7090 computer to plot form. Examples of distributions of amplitude, rate of change of amplitude, and rate of change of phase are presented. Power spectra of the received signal are shown. Several special tests were conducted to determine the resolution of the equipment and the results of these tests are discussed. Equipment limitations that must be considered in interpreting the data from the phase-stable system are pointed out.

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