Results 31 to 40 of about 13,242,853 (317)
Multichannel microwave photonic based direction finding system.
Optics Express, 2020 A new microwave photonic topology for RF signal direction finding is presented. It is based on a dual-parallel Mach Zehnder modulator (DPMZM) in series with an optical phase modulator (PM). The direction of an RF signal received by the antennas connected
Chongjia Huang, E. Chan
semanticscholar +1 more source
Highly Accurate Two-Dimensional Direction Finding Using Cumulant
IEEE Access, 2018 This paper proposes a new two-dimensional direction finding algorithm for estimating multiple non-Gaussian signals using cumulants. This new algorithm: 1) employs an array geometry consisting of a nine-element non-uniformly spaced cross-shaped sub-array ...
Chen Gu, Hong Hong, Xiaohua Zhu, Jin He
doaj +1 more source
Wireless Direction Finding [PDF]
Students Quarterly Journal, 1939 THE appearance of the fourth edition of this book will do much to dispel the impression, prevalent in some quarters, that the technique of radio direction finding has been rendered obsolete by the introduction and development of radar in recent years.
openaire +2 more sources
Direction finding with partly calibrated uniform linear arrays [PDF]
, 2012 A new method for direction finding with partly calibrated uniform linear arrays (ULAs) is presented. It is based on the conventional estimation of signal parameters via rotational invariance techniques (ESPRIT) by modeling the imperfections of the ULAs ...
Chan, SC, Liao, B
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Multisource Self-calibration for Sensor Arrays [PDF]
, 2009 Calibration of a sensor array is more involved if the antennas have direction dependent gains and multiple calibrator sources are simultaneously present. We study this case for a sensor array with arbitrary geometry but identical elements, i.e.
van der Veen, Alle-Jan +1 more
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Conjugate propagator method for direction finding
Tongxin xuebao, 2008 A new direction finding algorithm called conjugate propagator method （COP） for one-dimension signals was proposed. The new algorithm uses the array output and its conjugate form to extend the array aperture so that it can detect more signals than sensors
LIU Jian1 +3 more
doaj +2 more sources
A Two-Dimensional Direction Finding Method Based on Non-Uniform Array
IEEE Access, 2021 In this paper, an aperture expanding direction finding algorithm using L-shaped non-uniform sparse array is proposed. Firstly, the virtual array is expanded by vectorizing, de-redundant and sorting of received data covariance matrix.
Guibao Wang +3 more
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Finding Principal Null Direction for Numerical Relativists
, 1994 We present a new method for finding principal null directions (PNDs). Because our method assumes as input the intrinsic metric and extrinsic curvature of a spacelike hypersurface, it should be particularly useful to numerical relativists.
Arianrhod R +14 more
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Evolutionary approach for finding the atomic structure of steps on stable crystal surfaces [PDF]
, 2007 The problem addressed here can be concisely formulated as follows: Given a stable surface orientation with a known reconstruction and given a direction in the plane of this surface, find the atomic structure of the steps oriented along that direction. We
Briggs, Ryan M., Ciobanu, Cristian V.
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Improved VHF direction finding system [PDF]
, 1969 Direction finding device operating at very high frequencies requires a loop antenna, mechanical rotation, and large structures. The system is applicable to an unmanned configuration.
Graf, E. R., Neff, H.
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