Three-dimensional seismic endoscopy. I. Design of apparatus and basic imaging algorithms

2001 ◽  
Vol 39 (10) ◽  
pp. 2262-2274 ◽  
Author(s):  
H.-P. Valero ◽  
G. Saracco ◽  
D. Gibert
Keyword(s):  
Three Dimensional ◽  
Imaging Algorithms

Three Dimensional SAR Imaging Algorithms via a UWB Radar Sensor

2018 ◽  
pp. 1253-1260
Author(s):  
Zhenzhen Duan ◽  
Yuan Zhao ◽  
Huaiyuan Liu ◽  
Jian Zhang ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Radar Sensor ◽  
Uwb Radar ◽  
Sar Imaging ◽  
Imaging Algorithms

Overview of Ultrasound Imaging Algorithms Based on Synthetic Aperture Focusing Technique

2013 ◽  
Vol 712-715 ◽  
pp. 2051-2054
Author(s):  
Hong Chun Sun ◽  
Da Long Zhang ◽  
Shao Kun Wu
Keyword(s):  
Ultrasound Imaging ◽  
Three Dimensional ◽  
Synthetic Aperture ◽  
Imaging Technology ◽  
Signal Processing Method ◽  
Ultrasonic Echo ◽  
Synthetic Aperture Focusing ◽  
Imaging Algorithms ◽  
Synthetic Aperture Focusing Technique ◽  
Azimuth Resolution

Synthetic aperture focusing ultrasound imaging technique used signal processing method to analysis ultrasonic echo data. It let the performance of transducer with small apertures be as well as the transducer with large aperture. It can still obtain high azimuth resolution image and form three-dimensional image, when it was operated at lower operating frequency. This paper describes the history and the theory of synthetic aperture focusing ultrasound imaging technology. It also contains the development of the synthetic aperture focusing ultrasound imaging technology in China and at abroad. And lots of excellent synthetic aperture focusing ultrasound imaging algorithms were listed in this paper. We analyzed the deficiencies and problems of the existing ultrasound focusing algorithms. And we made forecast about the development of synthetic aperture technology in nondestructive testing.

scholarly journals Three-Dimensional Near-Field Microwave Holography for Tissue Imaging

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Reza K. Amineh ◽  
Ali Khalatpour ◽  
Haohan Xu ◽  
Yona Baskharoun ◽  
Natalia K. Nikolova
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Near Field ◽  
Spherical Wave ◽  
Three Dimensional ◽  
Incident Field ◽  
Tissue Imaging ◽  
Imaging Results ◽  
Tem Horn ◽  
Imaging Algorithms

This paper reports the progress toward a fast and reliable microwave imaging setup for tissue imaging exploiting near-field holographic reconstruction. The setup consists of two wideband TEM horn antennas aligned along each other’s boresight and performing a rectangular aperture raster scan. The tissue sensing is performed without coupling liquids. At each scanning position, wideband data is acquired. Then, novel holographic imaging algorithms are implemented to provide three-dimensional images of the inspected domain. In these new algorithms, the required incident field and Green’s function are obtained from numerical simulations. They replace the plane (or spherical) wave assumption in the previous holographic methods and enable accurate near-field imaging results. Here, we prove that both the incident field and Green’s function can be obtained from a single numerical simulation. This eliminates the need for optimization-based deblurring which was previously employed to remove the effect of realistic non-point-wise antennas.

Three-Dimensional Imaging Algorithms

2000 ◽  
pp. 397-438 ◽  
Author(s):  
Peter Geißler ◽  
Tobias Dierig ◽  
Hanspeter A. Mallot
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Imaging ◽  
Imaging Algorithms

scholarly journals Imaging Algorithm for Sea-Surface Ship Targets Based on Block Sparsity

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Zhang Lin ◽  
Jiang Yicheng
Keyword(s):  
High Resolution ◽  
Phased Array ◽  
Matching Pursuit ◽  
Three Dimensional ◽  
Sea Surface ◽  
Sea Waves ◽  
Process Data ◽  
Real Time Processing ◽  
Surface Ship ◽  
Imaging Algorithms

In this study, a phased array radar was used to accurately image stationary and moving ship targets on the vast sea surface. To solve the challenge in real-time processing of the massive amount of data generated by phased array synthetic-aperture radar imaging, this study leveraged the block sparse characteristics of ships on the sea surface and adopted the joint block orthogonal matching pursuit algorithm to obtain high-resolution one-dimensional range images. By only estimating the azimuth Doppler parameters of the targets within the range gates, the amount of process data was significantly reduced, and the data processing speed was enhanced. The synchrosqueezing transform-STFT algorithm was introduced to perform transient imaging as a solution to the blurred imaging of ships due to the three-dimensional swing under the action of waves. The images of the targets were obtained from different squint angles of the antenna array, which improved the imaging accuracy of ships on a vast sea surface. Compared with traditional imaging algorithms, this algorithm can effectively overcome the interference of sea clutter on ship imaging and the influence of sea waves on ship wobble; it can also obtain high-resolution imaging for both stationary and moving targets in a limited amount of time.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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