Results 51 to 60 of about 701,425 (185)
Modeling and predicting pointing errors in two dimensions [PDF]
, 2011 Recently, Wobbrock et al. (2008) derived a predictive model of pointing accuracy to complement Fitts ’ law’s predictive model of pointing speed. However, their model was based on one-dimensional (1-D) horizontal movement, while applications of such a ...
Alex Jansen +2 more
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Pointing Errors in Non-metric Virtual Environments [PDF]
, 2018 AbstractThere have been suggestions that human navigation may depend on representations that have no metric, Euclidean interpretation but that hypothesis remains contentious. An alternative is that observers build a consistent 3D representation of space.
Muryy, Alexander, Glennerster, Andrew
openaire +1 more source
Antenna pointing systematic error model derivations [PDF]
The pointing model used to represent and correct systematic errors for the Deep Space Network (DSN) antennas is presented. Analytical expressions are given in both azimuth-elevation (az-el) and hour angle-declination (ha-dec) mounts for RF axis ...
Guiar, C. N., Lansing, F. L., Riggs, R.
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Analysis and applications of a general boresight algorithm for the DSS-13 beam waveguide antenna [PDF]
A general antenna beam boresight algorithm is presented. Equations for axial pointing error, peak received signal level, and antenna half-power beamwidth are given.
Alvarez, L. S.
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Using ridge regression in systematic pointing error corrections [PDF]
A pointing error model is used in the antenna calibration process. Data from spacecraft or radio star observations are used to determine the parameters in the model.
Guiar, C. N.
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A Digital Twin Model for Optical Telescope Pointing Systems
IEEE Photonics JournalPointing accuracy, as one of the important indexes to measure the performance of optical tele-scope products, is directly related to the observation quality and efficiency of the telescope, but affected by a variety of complex factors, the timeliness ...
Zhenghao Li, Yahui Zhang, Yan He
doaj +1 more source
Some Entropy Bump Conditions for Fractional Maximal and Integral Operators
, 2015 We investigate weighted inequalities for fractional maximal operators and fractional integral operators. We work within the innovative framework of "entropy bounds" introduced by Treil--Volberg.
Rahm, Robert, Spencer, Scott
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The estimation of pointing angle and normalized surface scattering cross section from GEOS-3 radar altimeter measurements [PDF]
The statistical error of the pointing angle estimation technique is determined as a function of the effective receiver signal to noise ratio. Other sources of error are addressed and evaluated with inadequate calibration being of major concern.
Brown, G. S., Curry, W. J.
core +1 more source
IEEE Access, 2018 In this paper, we statistically analyze the performance of a threshold-based parallel multiple beam selection scheme for a free-space optical-based system with wavelength division multiplexing in cases where a pointing error has occurred under ...
Sung Sik Nam +2 more
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An analysis of the least-squares problem for the DSN systematic pointing error model [PDF]
A systematic pointing error model is used to calibrate antennas in the Deep Space Network. The least squares problem is described and analyzed along with the solution methods used to determine the model's parameters.
Alvarez, L. S.
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