A simple method for null steering in a circular array by perturbations of the radial locations of the elements

2002 ◽  
Author(s):  
J.A. Hejres ◽  
J.E. Richie
Keyword(s):  
Circular Array ◽  
Simple Method ◽  
Null Steering

Research on Beamforming Technique for Communications in Moving of Warship Circular Array Antenna

2012 ◽  
Vol 241-244 ◽  
pp. 2295-2298
Author(s):  
Qing Hua Wu ◽  
An Qing Zhang
Keyword(s):  
Antenna Array ◽  
Array Antenna ◽  
Beam Forming ◽  
Circular Array ◽  
Null Steering ◽  
Beam Directivity ◽  
Beamforming Technique ◽  
Maximum Directivity ◽  
Circular Array Antenna ◽  
Circular Antenna Array

Uniform circular antenna array of warship can bring beam and interference null steering from 360° symmetry without rotating. Directional communications can be achieved by UCA geometry. To solve the problem that warship’s stance is changed dynamically in course of sailing, a method was suggested that the electricity phases of UCA elements were changed based on information of stance about longitudinal sway, transverse sway and course. The proposed method can change beam directivity, and ensure providing a very directive pattern with stabilization, so that warships communication in moving each other. An expression of array maximum directivity forming with dynamic is proposed for UCA antenna. The simulation demonstrates that the beam forming method of communications in moving is validity, and is worth using with wide application.

scholarly journals Null Steering of Circular Array Using Array Factor for GPS Anti-Jam

2018 ◽  
Vol 18 (4) ◽  
pp. 267-269 ◽  
Author(s):  
Taek-Sun Kwon ◽  
Jae-Gon Lee ◽  
Jeong-Hae Lee
Keyword(s):  
Circular Array ◽  
Null Steering

A simple way for producing holographic filters suitable for image improvement

1978 ◽  
Vol 36 (1) ◽  
pp. 226-227
Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske
Keyword(s):  
Transfer Functions ◽  
Diffraction Order ◽  
Lateral Position ◽  
Simple Method ◽  
Spatial Frequencies ◽  
Resolution Electron ◽  
Wiener Filters ◽  
Image Improvement ◽  
Optical Reconstruction ◽  
Set Up

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.

Rotary Beveling for In Situ Thin-Section Microscopy of Cell Cultures

1981 ◽  
Vol 39 ◽  
pp. 550-551
Author(s):  
Dean A. Handley ◽  
Jack T. Alexander ◽  
Shu Chien
Keyword(s):  
Cell Growth ◽  
Cell Cultures ◽  
Molecular Interactions ◽  
Convenient Method ◽  
Petri Dish ◽  
Simple Method ◽  
Thin Section Microscopy ◽  
Thin Sectioning ◽  
Organic Fluids

In situ preparation of cell cultures for ultrastructural investigations is a convenient method by which fixation, dehydration and embedment are carried out in the culture petri dish. The in situ method offers the advantage of preserving the native orientation of cell-cell interactions, junctional regions and overlapping configurations. In order to section after embedment, the petri dish is usually separated from the polymerized resin by either differential cryo-contraction or solvation in organic fluids. The remaining resin block must be re-embedded before sectioning. Although removal of the petri dish may not disrupt the native cellular geometry, it does sacrifice what is now recognized as an important characteristic of cell growth: cell-substratum molecular interactions. To preserve the topographic cell-substratum relationship, we developed a simple method of tapered rotary beveling to reduce the petri dish thickness to a dimension suitable for direct thin sectioning.

Development of a simple method for the determination of single nucleotide polymorphisms

2010 ◽  
Vol 34 (8) ◽  
pp. S75-S75
Author(s):  
Weifeng Zhu ◽  
Zhuoqi Liu ◽  
Daya Luo ◽  
Xinyao Wu ◽  
Fusheng Wan
Keyword(s):  
Single Nucleotide Polymorphisms ◽  
Nucleotide Polymorphisms ◽  
Simple Method ◽  
Single Nucleotide
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