Digital phased array architectures for radar and communications based on off-the-shelf wireless technologies

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Authors
Ong, Chin Siang
Subjects
Phased array
Radar
Antenna
Transmitter
Digital receiver
Quadrature demodulation
COTS
Advisors
Jenn, David C.
Yeo, Siew Yam
Date of Issue
2004-12
Date
December 2004
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
This thesis is a continuation of the design and development of a three-dimensional 2.4 GHz digital phased array radar antenna. A commercial off-the-shelf quadrature modulator and demodulator were used as phase shifters in the digital transmit and receive arrays. The phase response characteristic of the demodulator was measured and the results show that the phase difference between the received phase and transmit phase is small. In order to increase the bandwidth of the phased array, a method of time-varying phase weights for linear frequency modulated signal was investigated. Using time-varying phase weights on transmit and receive give the best performance, but require the range information of the target. It is more practical to use time-varying phase weights on only one side (transmit or receive but not both), and constant phase weights on the other side. The simulation results showed that by using time-varying phase weights, the matched filter loss is not as severe as it is when using the conventional fixed weights technique. It was also found that this method is only effective for small scan angles when the time-bandwidth product is large. The approach to implement time-varying phase weights on transmit using commercial components such as direct digital synthesizer and quadrature modulator is discussed.
Type
Thesis
Description
Series/Report No
Department
Department of Electrical and Computer Engineering
Organization
Naval Postgraduate School (U.S.).
Identifiers
NPS Report Number
Sponsors
Funder
Format
xvi, 65 p. : ill. (some col.)
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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Copyright is reserved by the copyright owner
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