A NARROW-BAND PHASELOCK RECEIVER FOR NORTHERN COMMUNICATION
Date
1966-05
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ORCID
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Degree Level
Masters
Abstract
A low-power, narrow-band VHF ionospheric forward-scatter communication link has been proposed to provide reliable communication in northern latitudes. Conflicting results produced by two ;previous experiments concerned with establishing the feasibility of such a system have suggested that a more detailed analysis of the phaselock receiver used in these experiments be undertaken.
This thesis is concerned with the analysis of the phaselock receiver with special attention focused on the random Doppler shifts introduced by the ionosphere, which are the limiting factors in the design of such a system. A model is developed for the particular system under study. The analysis of the non-linear model is achieved by a quasi-linearization method. Computer solutions are resorted to where necessary. Threshold is considered for the second-order and first-order systems. The first-order system has advantages at low S/N ratios. It is also shown that a first-order system has a better sensitivity when receiving a Doppler shifted
signal. To implement a first-order system high frequency stability is necessary. In addition, detailed information about Doppler shifted is desired, and a highly stable system is necessary for this purpose. Frequency stability was introduced to the system.
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Degree
Master of Science (M.Sc.)
Department
Electrical Engineering