Estimation of the Cumulative Amplitude Probability Distribution Function of Ionospheric Scintillations.

The fading characteristics of ionospheric scintillations can be precisely described by a cumulative amplitude probability distribution function (cdf). The cdf expresses the probability or percentage of time that the signal amplitude will equal or exceed a given amplitude. Utilizing ionospheric scint...

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Bibliographic Details
Main Authors: Whitney,Herbert E., Aarons,Jules, Seemann,Douglas R.
Other Authors: AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Format: Text
Language:English
Published: 1971
Subjects:
Radiofrequency Wave Propagation
Radio Communications
*RADIO WAVES
IONOSPHERIC PROPAGATION
SCINTILLATION
RADIOFREQUENCY INTERFERENCE
PROBABILITY DENSITY FUNCTIONS
VERY HIGH FREQUENCY
ULTRAHIGH FREQUENCY
NAVIGATION SATELLITES
ATS-3 SATELLITE
PROBABILITY DISTRIBUTION FUNCTIONS
Greenland
Narssarssuaq
Online Access:http://www.dtic.mil/docs/citations/AD0736405
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0736405
Description
Summary:The fading characteristics of ionospheric scintillations can be precisely described by a cumulative amplitude probability distribution function (cdf). The cdf expresses the probability or percentage of time that the signal amplitude will equal or exceed a given amplitude. Utilizing ionospheric scintillations observed on beacon signals from synchronous satellites transmitting at 136 MHz, distributions of amplitude variations have been made. The resulting distributions have been divided into five groups corresponding to ranges of scintillation index, the predominant measure in scintillation studies. The five distribution models are then combined with the occurrence of scintillations in various index ranges to produce cumulative amplitude probability distributions. These have been done for long term observations made at Hamilton, Mass., Narssarssuaq, Greenland, and Huancayo, Peru. The resulting data allows engineers to determine margins necessary for communication and navigation systems. (Author)

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