Systematic error analysis and compensation for high accuracy star centroid estimation of star tracker

2010 ◽  
Vol 53 (11) ◽  
pp. 3145-3152 ◽  
Author(s):  
Hui Jia ◽  
JianKun Yang ◽  
XiuJian Li ◽  
JunCai Yang ◽  
MengFei Yang ◽  
...  
Keyword(s):  
Error Analysis ◽  
Systematic Error ◽  
High Accuracy ◽  
Star Tracker ◽  
Centroid Estimation

Systematic Error Analysis for the Enhancement of Biometric Systems Using Soft Biometrics

2012 ◽  
Vol 19 (12) ◽  
pp. 833-836 ◽  
Author(s):  
Anastasios Drosou ◽  
D. Tzovaras ◽  
K. Moustakas ◽  
M. Petrou
Keyword(s):  
Error Analysis ◽  
Systematic Error ◽  
Soft Biometrics ◽  
Biometric Systems

Modified wavelet method for solving fractional variational problems

2020 ◽  
pp. 107754632093202
Author(s):  
Haniye Dehestani ◽  
Yadollah Ordokhani ◽  
Mohsen Razzaghi
Keyword(s):  
Error Analysis ◽  
Operational Matrix ◽  
Approximate Solutions ◽  
Variational Problems ◽  
High Accuracy ◽  
Construction Method ◽  
Computational Method ◽  
Wavelet Method ◽  
Fractional Variational Problems ◽  
Operational Matrix Of Integration

In this article, a newly modified Bessel wavelet method for solving fractional variational problems is considered. The modified operational matrix of integration based on Bessel wavelet functions is proposed for solving the problems. In the process of computing this matrix, we have tried to provide a high-accuracy operational matrix. We also introduce the pseudo-operational matrix of derivative and the dual operational matrix with the coefficient. Also, we investigate the error analysis of the computational method. In the examples section, the behavior of the approximate solutions with respect to various parameters involved in the construction method is tested to illustrate the efficiency and accuracy of the proposed method.

The Stolz and ASME-AGA Orifice Equations Compared to Laboratory Data

1979 ◽  
Vol 101 (4) ◽  
pp. 483-490 ◽  
Author(s):  
R. W. Miller
Keyword(s):  
Systematic Error ◽  
Laboratory Data ◽  
High Accuracy ◽  
Laboratory Results ◽  
Using Data ◽  
The U.S ◽  
Ratio Range ◽  
Better Than

Today, technical experts in Europe and the U.S. are debating the merits of conducting new orifice flowmeter tests, establishing the effects of upstream disturbance and conducting other programs to improve orifice flowmetering accuracy. ISO has adopted a new “Universal” orifice equation proposed by J. Stolz. With over 1,000,000 orifice flowmeters in use today, any change in the coefficient value is of major concern. There are now two equations for calculating flange tap coefficients, the ASME-AGA equation and the ISO equation. They differ in form, predict different coefficients, and have different overall uncertainties (tolerance value). This paper presents a comparison between actual laboratory data and these two equations. The data were obtained in two high accuracy laboratories on flange tap orifice flowmeters fabricated by different manufacturers to AGA or ASME recommendations. Data plate dimensions were used in all calculations, and conformity to ASME or AGA requirements was the responsibility of the manufacturer. For this reason it is believed that the analysis more nearly represents what the user can expect if the in-site installation approached that of the laboratory. Results indicate that over the same beta ratio range the ISO (or Stolz) equation form is significantly better than the present ASME-AGA form. The overall uncertainty (or tolerance), although smaller than the ASME-AGA, is still ± 1 percent because of a 0.4 percent systematic error. Results of work by Miller-Kneisel, using data from three different laboratories, are presented to indicate that ±0.5 percent remains achievable; for betas up to 0.7 using the ISO (Stolz) equation form with modified coefficients.

Systematic error analysis of line-structured light calibration

2019 ◽  
Author(s):  
Zhongwen Fei ◽  
Zhiying Tan ◽  
Xiaobin Xu ◽  
Kaiyuan Zhu ◽  
Guangyu Su
Keyword(s):  
Error Analysis ◽  
Systematic Error ◽  
Structured Light

scholarly journals New Aura Microwave Limb Sounder observations of BrO and implications for Br<sub>y</sub>

2012 ◽  
Vol 5 (7) ◽  
pp. 1741-1751 ◽  
Author(s):  
L. Millán ◽  
N. Livesey ◽  
W. Read ◽  
L. Froidevaux ◽  
D. Kinnison ◽  
...  
Keyword(s):  
Error Analysis ◽  
Systematic Error ◽  
State Of The Art ◽  
Numerical Models ◽  
Inversion Algorithm ◽  
Broad Agreement ◽  
Atmospheric State

Abstract. This paper introduces a new inversion algorithm for retrievals of stratospheric BrO from the Aura Microwave Limb Sounder. This version is based on the algorithm described by Livesey et al. (2006a) but uses a more realistic atmospheric state to constrain the retrieval. A description of the methodology and an error analysis are presented. Single daily profile precision uncertainty, when taking the ascending-descending (day-night) difference, was found to be up to 40 pptv while systematic error biases were estimated to be less than about 3 pptv. Monthly mean comparisons show broad agreement with other measurements as well as with state-of-the-art numerical models. We infer a 2005 yearly total inorganic Bry using the measured MLS BrO to be 20.3 ± 4.5 pptv, which implies a contribution from very short lived substances to the stratospheric bromine budget of 5 ± 4.5 pptv.

scholarly journals Static and Dynamic Error of a Biplanar Videoradiography System Using Marker-Based and Markerless Tracking Techniques

2011 ◽  
Vol 133 (12) ◽  
Author(s):  
Daniel L. Miranda ◽  
Joel B. Schwartz ◽  
Andrew C. Loomis ◽  
Elizabeth L. Brainerd ◽  
Braden C. Fleming ◽  
...  
Keyword(s):  
Systematic Error ◽  
Gold Standard ◽  
High Speed ◽  
Angular Displacement ◽  
High Accuracy ◽  
Tracking Algorithm ◽  
Future Research ◽  
Markerless Tracking ◽  
Standard Instrumentation

The use of biplanar videoradiography technology has become increasingly popular for evaluating joint function in vivo. Two fundamentally different methods are currently employed to reconstruct 3D bone motions captured using this technology. Marker-based tracking requires at least three radio-opaque markers to be implanted in the bone of interest. Markerless tracking makes use of algorithms designed to match 3D bone shapes to biplanar videoradiography data. In order to reliably quantify in vivo bone motion, the systematic error of these tracking techniques should be evaluated. Herein, we present new markerless tracking software that makes use of modern GPU technology, describe a versatile method for quantifying the systematic error of a biplanar videoradiography motion capture system using independent gold standard instrumentation, and evaluate the systematic error of the W.M. Keck XROMM Facility’s biplanar videoradiography system using both marker-based and markerless tracking algorithms under static and dynamic motion conditions. A polycarbonate flag embedded with 12 radio-opaque markers was used to evaluate the systematic error of the marker-based tracking algorithm. Three human cadaveric bones (distal femur, distal radius, and distal ulna) were used to evaluate the systematic error of the markerless tracking algorithm. The systematic error was evaluated by comparing motions to independent gold standard instrumentation. Static motions were compared to high accuracy linear and rotary stages while dynamic motions were compared to a high accuracy angular displacement transducer. Marker-based tracking was shown to effectively track motion to within 0.1 mm and 0.1 deg under static and dynamic conditions. Furthermore, the presented results indicate that markerless tracking can be used to effectively track rapid bone motions to within 0.15 deg for the distal aspects of the femur, radius, and ulna. Both marker-based and markerless tracking techniques were in excellent agreement with the gold standard instrumentation for both static and dynamic testing protocols. Future research will employ these techniques to quantify in vivo joint motion for high-speed upper and lower extremity impacts such as jumping, landing, and hammering.

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