Results 21 to 30 of about 688,541 (286)
iScience, 2023 Summary: The space gravitational wave detection mission requires a super ''static and precise'' scientific experiment environment. In order to solve the non-conservative force disturbance variation and the actuator noise and measurement noise, this paper
Junjie Zhou, Aiping Pang, Hongbo Zhou
doaj +1 more source
Remote Sensing, 2022 Atmospheric drag provides an indirect approach for evaluating atmospheric mass density, which can be derived from the Precise Orbit Determination (POD) of Low Earth Orbit (LEO) satellites. A method was developed to estimate nongravitational acceleration,
Yueqiang Sun +15 more
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All-propulsion design of the drag-free and attitude control of the European satellite GOCE [PDF]
, 2009 This paper concerns the drag-free and attitude control (DFAC) of the European Gravity field and steady-state Ocean Circulation Explorer satellite (GOCE), during the science phase.
Luca Massotti +3 more
core +1 more source
Strategies for in-orbit calibration of drag-free control systems [PDF]
, 2008 Drag-Free Satellites (DFS) are a class of scientific satellite missions designed for research on fundamental physics as well as geodesy. They consist, basically, of a small inner satellite (test mass) located in a cavity inside a larger satellite, the ...
Leite Filho, Waldemar Castro +2 more
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Fuel Optimization for Low Earth Orbit Maintenance [PDF]
Journal of Astronomy and Space Sciences, 2008 The resolution of Earth images taken from a satellite has close relation with satellite's altitude. If a satellite has lower altitude, it gets a picture having better resolution.
Yong Jae Park +3 more
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Storm time neutral density assimilation in the thermosphere ionosphere with TIDA
Journal of Space Weather and Space Climate, 2022 To improve Thermosphere–Ionosphere modeling during disturbed conditions, data assimilation schemes that can account for the large and fast-moving gradients moving through the modeled domain are necessary.
Codrescu Mihail V. +2 more
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Universal adaptive control of satellite formation flying [PDF]
, 2005 In this paper, a new universal adaptive control scheme for satellite formation flying is developed. The underline idea of our design is to combine the domination design and the monotone adaptive gain.
Pongvthithum, R. +3 more
core +1 more source
Toward Accurate Physics‐Based Specifications of Neutral Density Using GNSS‐Enabled Small Satellites
Space Weather, 2021 Satellite‐atmosphere interactions cause large uncertainties in low‐Earth orbit determination and prediction. Thus, knowledge of and the ability to predict the space environment, most notably thermospheric mass density, are essential for operating ...
Eric K. Sutton +6 more
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Comparison of a Neutral Density Model With the SET HASDM Density Database
Space Weather, 2021 The EXospheric TEMperatures on a PoLyhedrAl gRid (EXTEMPLAR) method predicts the neutral densities in the thermosphere. The performance of this model has been evaluated through a comparison with the Air Force High Accuracy Satellite Drag Model (HASDM ...
Daniel R. Weimer +5 more
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Stochastic Entanglement of Deterministic Origami Tentacles For Robust Robotic Grasping. [PDF]
Adv Sci (Weinh)This study introduces an origami tentacle gripper to robustly grasp objects‐in air, underwater, and even in orbital space‐by exploiting a synergy between local, deterministic deformation programming and global, stochastic entanglements. A single origami tentacle can be designed to coil with a simple tendon pull.
Boron A +4 more
europepmc +2 more sources