High Frequency (HF) radio signal amplitude characteristics, HF receiver site performance criteria, and expanding the dynamic range of HF digital new energy receivers by strong signal elimination
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Authors
Lott, Gus K., Jr.
Subjects
HF signals
HF receiver
Wideband receiver
Spectrum survey
HF signal amplitude probability distribution
Log-normal
Receiver site performance
Analog-to-digital converter
A/D
Electromagnetic compatibility
Dynamic range
New energy detection
Strong signal elimination
HF receiver
Wideband receiver
Spectrum survey
HF signal amplitude probability distribution
Log-normal
Receiver site performance
Analog-to-digital converter
A/D
Electromagnetic compatibility
Dynamic range
New energy detection
Strong signal elimination
Advisors
Jauregui, Stephen
Date of Issue
1990-06
Date
June 1990
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
The dissertation discusses High Frequency (HF) radio sources. It consolidates data from all available, published HF spectrum surveys. The author conducted a new HF survey using detection of new energy events. The first cumulative probability distribution function for the amplitude of detected non-broadcast HF signals is developed, and the distribution is log-normal. HF receiver site performance quantification is possible using the HF signal distributions. Site performance degradation results from noise, interference, and signal path attenuation. Noise examples are presented in a 3-D format of time, frequency, and amplitude. Graphs are presented that allow estimation of the percentage of HF non-broadcast signals lost as a function of noise and interference levels. Limitations of HF search receivers using analog-to-digital converters as the receiver front-end are discussed. Derived bounds on AD converter performance show that today's digital technology does not provide enough dynamic range, sensitivity, or sampling rate. Alternative dynamic range extension methods are examined. A new method of dynamic range extension by removing the strongest signals present is presented. Greater receiver sensitivity results from changing the HF signal environment seen by the AD converter. The new method uses a phase-tracking network and signal reconstruction techniques.
Type
Thesis
Description
Series/Report No
Department
Department of Electrical and Computer Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
NPS62-90-006
Sponsors
Funding
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.