Optimum symmetrical number system phase sampled direction finding antenna architectures
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Authors
Hatziathanasiou, Thomas N.
Subjects
Direction Finding Antennas
Array Antennas
Rectangular Aperture Antennas
Open-ended Waveguides
Optimum Symmetrical Number System (OSNS)
Weighted Summing Amplifier
Analog-to-Digital
Array Antennas
Rectangular Aperture Antennas
Open-ended Waveguides
Optimum Symmetrical Number System (OSNS)
Weighted Summing Amplifier
Analog-to-Digital
Advisors
Pace, Phillip E.
Cleary, David D.
Date of Issue
1998-06-01
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A new interferometer direction finding array architecture based on the optimum symmetrical number system (OSNS) is presented. OSNS arrays are capable of unambiguous high-resolution direction finding with as few as three elements, with multiple baseline options. The OSNS DF antenna architecture being investigated uses the OSNS to decompose the analog spatial filtering operation into a number of parallel sub-operations (moduli) that are of smaller complexity. One two-element interferometer is used for each sub-operation and only requires a precision in accordance with its modulus. A much higher spatial resolution is achieved after the sub-operations are recombined. By incorporating the OSNS concept, the dynamic range of a specific configuration of antenna element spacings and comparator arrangements can be analyzed exactly. In this thesis, the OSNS DF antenna concept was demonstrated experimentally, by designing, fabricating and measuring the performance of a three-element array at 8.5 GHz. These three elements are grouped into two pairs (channels) according to the set of relatively prime moduli (m1 = 6, m2 = 11). A mixer is used to determine the phase difference between each pair of elements. The output voltage from the mixer in each channel is a symmetrical folding waveform that is DC biased and amplified using a summing amplifier. The output voltage of the amplifier is amplitude analyzed using a small comparator ladder. An EEPROM is used to recombine the results of these low precision channels to yield the high resolution direction of arrival (DOA). Simulated and experimental results are presented and compared
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
xx, 194 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner.