Time sidelobe reduction technique for binary phase coded pulse compression

2002 ◽  
Author(s):  
R. Sato ◽  
M. Shinriki
Keyword(s):  
Pulse Compression ◽  
Reduction Technique ◽  
Binary Phase

Chirped Pulse Compression Based on Fresnel-Inspired Binary Phase Shaping

2020 ◽  
Vol 57 (19) ◽  
pp. 193201
Author(s):  
李百宏 Li Baihong ◽  
夏志广 Xia Zhiguang ◽  
赵鹏达 Zhao Pengda ◽  
项晓 Xiang Xiao ◽  
董瑞芳 Dong Ruifang ◽  
...  
Keyword(s):  
Pulse Compression ◽  
Chirped Pulse ◽  
Binary Phase

scholarly journals Speckle Reduction for Ultrasonic Imaging Using Frequency Compounding and Despeckling Filters along with Coded Excitation and Pulse Compression

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Joshua S. Ullom ◽  
Michael L. Oelze ◽  
Jose R. Sanchez
Keyword(s):  
Anisotropic Diffusion ◽  
Pulse Compression ◽  
Resolution Enhancement ◽  
Reduction Technique ◽  
Center Frequency ◽  
Speckle Reduction ◽  
Single Element ◽  
Experimental Measurements ◽  
Axial Resolution ◽  
Coded Excitation

A method for improving the contrast-to-noise ratio (CNR) while maintaining the −6 dB axial resolution of ultrasonic B-mode images is proposed. The technique proposed is known as eREC-FC, which enhances a recently developed REC-FC technique. REC-FC is a combination of the coded excitation technique known as resolution enhancement compression (REC) and the speckle-reduction technique frequency compounding (FC). In REC-FC, image CNR is improved but at the expense of a reduction in axial resolution. However, by compounding various REC-FC images made from various subband widths, the tradeoff between axial resolution and CNR enhancement can be extended. Further improvements in CNR can be obtained by applying postprocessing despeckling filters to the eREC-FC B-mode images. The despeckling filters evaluated were the following: median, Lee, homogeneous mask area, geometric, and speckle-reducing anisotropic diffusion (SRAD). Simulations and experimental measurements were conducted with a single-element transducer (f/2.66) having a center frequency of 2.25 MHz and a −3 dB bandwidth of 50%. In simulations and experiments, the eREC-FC technique resulted in the same axial resolution that would be typically observed with conventional excitation with a pulse. Moreover, increases in CNR of 348% were obtained in experiments when comparing eREC-FC with a Lee filter to conventional pulsing methods.

Binary Phase Studies of 4-4'-N-Pentylcyanobiphenyl

1990 ◽  
Vol 182 (1) ◽  
pp. 185-194 ◽  
Author(s):  
R. S. Porter ◽  
K. T. Schell
Keyword(s):  
Binary Phase
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