Doppler Angle of Arrival Spectral Measurement System.

Velocity and structure of irregularities in the arctic ionosphere are measured with the Doppler Arrival Angle Spectral Measurement system (DAASM) in Goose Bay, Labrador. The complex amplitudes of the echo returns received at up to 24 antennas, aligned along the magnetic meridian, provide the basis f...

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Bibliographic Details
Main Author: Bibl,Klaus
Other Authors: LOWELL TECHNOLOGICAL INST RESEARCH FOUNDATION MASS
Format: Text
Language:English
Published: 1973
Subjects:
Atmospheric Physics
*IONOSPHERE
*ATMOSPHERIC SOUNDING
DIGITAL SYSTEMS
POLAR REGIONS
ANGLE OF ARRIVAL
AURORAE
ANTENNA ARRAYS
ATMOSPHERES
SPECTRUM ANALYZERS
ARCTIC REGIONS
DOPPLER EFFECT
DAASM(Doppler Arrival Angle Spectral Measurement System)
Doppler arrival angle spectral measurement system
Labrador
Arctic
Online Access:http://www.dtic.mil/docs/citations/ADA002306
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA002306
Description
Summary:Velocity and structure of irregularities in the arctic ionosphere are measured with the Doppler Arrival Angle Spectral Measurement system (DAASM) in Goose Bay, Labrador. The complex amplitudes of the echo returns received at up to 24 antennas, aligned along the magnetic meridian, provide the basis for complex Fourier analysis. Sampling with eight simultaneous range gates resolves complicated echo structure. A 10 kW peak power transmitter feeds a vertically polarized log-periodic antenna pre-sited in the magnetic north direction. Pulses of 100 microsec width are transmitted at a rate of 200 or 400 pulses per second.

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