scholarly journals Ratio improved adaptive systems moving target autoregressive type

2015 ◽  
pp. 88-92
Author(s):  
V. G. Bartenev ◽  
M. V. Bartenev ◽  
V. K. Bityukov
Keyword(s):  
Comparative Analysis ◽  
Correlation Matrix ◽  
Adaptive Systems ◽  
Matrix Inversion ◽  
Ar Model ◽  
Moving Target ◽  
Correlated Noise ◽  
Weight Factor ◽  
Improvement Factor

The comparative analysis of the effectiveness of methods for implementing adaptive systems moving target based on autoregression approach. AR model correlated noise can effectively deal with clutter, without resorting to the algorithm based on the correlation matrix inversion. Considered several methods of weight factor of adaptive systems moving target, which is used as the coefficients of the autoregression. One of the main parameters that determine the effectiveness of the systems being compared, is the improvement factor, which was used in this study.

Research of Beam Domain MVDR and Motion Compensation

2014 ◽  
Vol 686 ◽  
pp. 363-370
Author(s):  
Xiu Bo Luo ◽  
De Min Xu ◽  
Jun Jun Hu ◽  
Xiao Mei Hu
Keyword(s):  
High Resolution ◽  
Target Detection ◽  
Motion Compensation ◽  
Correlation Matrix ◽  
Detection Method ◽  
Minimum Variance ◽  
Moving Target ◽  
Detection Ability ◽  
Minimum Variance Distortionless Response ◽  
Motion Effect

Minimum variance distortionless response (MVDR) beamformer is a better target detection method, which provided high-resolution and anti-interference abilities. But the nice features will be degraded significantly for a fast bearing-rate target. Because the eigenvalue of longtime integral correlation matrix will spread, the signal and interference are no longer clearly identified by the eigenvectors. A beam domain MVDR and motion compensation arithmetic is given in this paper. The motion effect can be compensated by tracking the signal bearing change using real time estimated beam domain covariance matrix. The detection ability of moving target can be improved.

Microspectroscopy Using a Solid Immersion Lens

2001 ◽  
Vol 7 (S2) ◽  
pp. 148-149
Author(s):  
C.D. Poweleit ◽  
J Menéndez
Keyword(s):  
Spatial Resolution ◽  
Focal Plane ◽  
Numerical Aperture ◽  
Normal Incidence ◽  
Spot Size ◽  
Index Of Refraction ◽  
Objective Lens ◽  
Improvement Factor ◽  
Oil Immersion ◽  
Long Time

Oil immersion lenses have been used in optical microscopy for a long time. The light’s wavelength is decreased by the oil’s index of refraction n and this reduces the minimum spot size. Additionally, the oil medium allows a larger collection angle, thereby increasing the numerical aperture. The SIL is based on the same principle, but offers more flexibility because the higher index material is solid. in particular, SILs can be deployed in cryogenic environments. Using a hemispherical glass the spatial resolution is improved by a factor n with respect to the resolution obtained with the microscope’s objective lens alone. The improvement factor is equal to n2 for truncated spheres.As shown in Fig. 1, the hemisphere SIL is in contact with the sample and does not affect the position of the focal plane. The focused rays from the objective strike the lens at normal incidence, so that no refraction takes place.

1207: Failed Pyeloplasty in Children: Comparative Analysis of Retrograde Endopyelotomy VS. Re-do Pyeloplasty

2007 ◽  
Vol 177 (4S) ◽  
pp. 398-398
Author(s):  
Luis H. Braga ◽  
Joao L. Pippi Salle ◽  
Sumit Dave ◽  
Sean Skeldon ◽  
Armando J. Lorenzo ◽  
...  
Keyword(s):  
Comparative Analysis
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