Solutions of Time-Invariant Spatial Focusing for Multi-Targets Using Time Modulated Frequency Diverse Antenna Arrays

This paper proposes two classes of time-modulated frequency diverse arrays for achieving time-invariant spatial focusing for multiple targets. Both are based on modified time-modulated optimized frequency offset (TMOFO) that depends only on the range, and they are termed TMOFO-based phase conjugatin...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 65; no. 2; pp. 552 - 566
Main Authors Yao, A-Min, Wu, Wen, Fang, Da-Gang
Format Journal Article
LanguageEnglish
Published IEEE 01.02.2017
Subjects
4-D beampattern
antenna arrays
Focusing
Frequency diversity
Harmonic analysis
Phased arrays
Principal component analysis
range focusing
retrodirectivity
time modulation
Time-frequency analysis
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Summary:This paper proposes two classes of time-modulated frequency diverse arrays for achieving time-invariant spatial focusing for multiple targets. Both are based on modified time-modulated optimized frequency offset (TMOFO) that depends only on the range, and they are termed TMOFO-based phase conjugating array (TMOFO-PCA) and TMOFO-based harmonic beam array (TMOFO-HBA). For the TMOFO-PCA, each phase conjugator in each channel is fed with a local oscillator signal at twice the RF frequency plus a small interelement frequency offset, resulting in the generated range-angle-dependent retrodirective beampatterns with single time-invariant maxima for each of the multiple interrogators. For the TMOFO-HBA, the multiple harmonic frequencies in a conventional time-modulated array are utilized with a common small interelement frequency offset, resulting in the simultaneous generation of range-angle-dependent harmonic beampatterns with single time-invariant maxima for each of the multiple targets. To validate the proposed two-array schemes, numerical examples of uniformly excited, equally spaced TMOFO-PCAs and TMOFO-HBAs dealing with two targets are reported and discussed.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2016.2633902