Results 131 to 140 of about 383,072 (432)
Parking a Spacecraft near an Asteroid Pair [PDF]
, 2005 This paper studies the dynamics of a spacecraft moving in the field of a binary asteroid. The asteroid pair is modeled as a rigid body and a sphere moving in a plane, while the spacecraft moves in space under the influence of the gravitational field of
Gabern, Frederic +2 more
core +3 more sources
Precession of Mercury’s Perihelion from Ranging to the MESSENGER Spacecraft
, 2017 The perihelion of Mercury’s orbit precesses due to perturbations from other solar system bodies, solar quadrupole moment (J2), and relativistic gravitational effects that are proportional to linear combinations of the parametrized post-Newtonian ...
R. Park +5 more
semanticscholar +1 more source
Risk, Hazards &Crisis in Public Policy, EarlyView.Abstract Near‐earth orbits are becoming congested because of a rapid growth in the number of satellites and space debris, which presents a real threat to the sustainable use of space and the safety of the Earth. Despite space scientists and public policymakers having been actively seeking solutions for decades, solving the problem has been put off ...
Anna Ya Ni +2 more
wiley +1 more source
Asteroid mining with small spacecraft and its economic feasibility [PDF]
arXiv, 2018 Asteroid mining offers the possibility to revolutionize supply of resources vital for human civilization. Preliminary analysis suggests that Near-Earth Asteroids (NEA) contain enough volatile and high value minerals to make the mining process economically feasible.
arxiv
Design of drive control for digital transmission relay antenna based on FPGA miniaturization
Dianzi Jishu Yingyong, 2019 In order to meet the requirements of spacecraft miniaturization design, a single chip anti-fuse FPGA is used as main control chip for driving relay antenna.
Hou Chao +3 more
doaj +1 more source
Space environmental interactions with spacecraft surfaces [PDF]
Environmental interactions are defined as the response of spacecraft surfaces to the charged-particle environment. These interactions are divided into two broad categories: spacecraft passive, in which the environment acts on the surfaces and spacecraft ...
Stevens, J. N.
core +1 more source
Fixed‐Time Control Lyapunov Function for Networked Non‐Linear Uncertain Systems
International Journal of Robust and Nonlinear Control, EarlyView.ABSTRACT This paper introduces a novel tool based on Lyapunov functions, aimed at analyzing the fixed‐time property of networked non‐linear uncertain systems while incorporating a specifically designed control law. The applicability of this tool is demonstrated by addressing the fixed‐time synchronization challenge within non‐linear uncertain multi ...
Yi Dong, Zhiyong Chen
wiley +1 more source
Novel Use of Photovoltaics for Backup Spacecraft Laser Communication System [PDF]
arXiv, 2017 Communication with a spacecraft is typically performed using Radio Frequency (RF). RF is a well-established and well-regulated technology that enables communication over long distances as proven by the Voyager 1 & II missions. However, RF requires licensing of very limited radio spectrum and this poses a challenge in the future, particularly with ...
arxiv
Survey of VLF Electric Fields in the Magnetosphere With the Polar Orbiting Spacecraft, 1964–45A [PDF]
, 1966 F. L. Scar, G. M. Crook, R. W. Fredricks
openalex +1 more source