Results 71 to 80 of about 547,647 (206)
Chinese Journal of Mechanical EngineeringPointing mechanism is widely used in aerospace field, and its pointing accuracy and stability have high requirements. The pointing mechanism will be affected by external interference when it works.
Sen Wang +5 more
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The Annular Suspension and Pointing (ASP) system for space experiments and predicted pointing accuracies [PDF]
An annular suspension and pointing system consisting of pointing assemblies for coarse and vernier pointing is described. The first assembly is attached to a carrier spacecraft (e.g., the space shuttle) and consists of an azimuth gimbal and an elevation ...
Anderson, W. W., Joshi, S. M.
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IEEE Photonics JournalAccording to the research status of fast beam pointing and scanning in space laser communication, this paper proposes a beam deflection method that cascades liquid crystal tunable phase retarder with polarization grating, and realizes fast beam scanning ...
Qvan Han Wang +5 more
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Precision pointing compensation for DSN antennas with optical distance measuring sensors [PDF]
The pointing control loops of Deep Space Network (DSN) antennas do not account for unmodeled deflections of the primary and secondary reflectors. As a result, structural distortions due to unpredictable environmental loads can result in uncompensated ...
Scheid, R. E.
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The Scientific World Journal, 2014 Although many three-dimensional pointing gesture recognition methods have been proposed, the problem of self-occlusion has not been considered. Furthermore, because almost all pointing gesture recognition methods use a wide-angle camera, additional ...
Hansol Kim, Yoonkyung Kim, Eui Chul Lee
doaj +1 more source
Evaluation of ERBE scanner pointing accuracy based upon a coastline detection algorithm [PDF]
Measurements from the Earth Radiation Budget Experiment (ERBE) scanning radiometers must be accurately located at the top of the Earth's atmosphere for proper interpretation of derived longwave and shortwave components of the Earth radiation field.
Hoffman, Lawrence H. +2 more
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AerospaceSpace-borne antenna pointing is affected by uncertain disturbances like satellite attitude, structural flexibility, and manufacturing/installation errors. Understanding the effect of these uncertainties is crucial for antenna performance.
Shiyu Tan +4 more
doaj +1 more source
Solar experiment alignment system [PDF]
, 1972 Sensor system determines absolute alignment of optical axis of experiment package relative to solar vector and provides control information to permit pointing experiment anywhere on solar disc to absolute accuracy of the order of two arc seconds in ...
Fain, D. L.
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, 2014 High throughput, low inner working angle (IWA) phase masks coronagraphs are essential to directly image and characterize (via spectroscopy) earth-like planets.
Baudoz, Pierre +7 more
core +2 more sources
Geometry and optics calibration of WFCTA prototype telescopes using star light
, 2010 The Large High Altitude Air Shower Observatory project is proposed to study high energy gamma ray astronomy ( 40 GeV-1 PeV ) and cosmic ray physics ( 20 TeV-1 EeV ).
Bin Zhou +22 more
core +1 more source