Results 31 to 40 of about 383,072 (432)
Baseline designing and implementation approach for a Geo-SAR tomography system
The Journal of Engineering, 2019 This study proposes a new method to design and implement the baseline of a geosynchronous Earth orbit synthetic aperture radar (Geo-SAR) tomography system. Due to the satellite's orbital property, its ideal revisit cycle is 1 day, and it could be changed
Zhao Bingji +4 more
doaj +1 more source
Precise Model for Small-Body Thermal Radiation Pressure Acting on Spacecraft [PDF]
, 2017 A precise representation of small-body surface thermal radiation pressure effects acting on orbiting spacecraft is discussed. The proposed framework takes advantage of a general Fourier series expansion to compute small-body surface thermal radiation ...
Hesar, Siamak G. +3 more
core +1 more source
An Efficient Algorithm for Periodic Riccati Equation for Spacecraft Attitude Control Using Magnetic Torques [PDF]
Automatica 78 (2017) 103-109, 2016 Spacecraft attitude control using only magnetic torques is a periodic time-varying system as the Earth magnetic field in the spacecraft body frame changes periodically while the spacecraft circles around the Earth. The optimal controller design therefore involves the solutions of the periodic Riccati differential or algebraic equations.
arxiv +1 more source
Stochastic Subspace Method for Experimental Modal Analysis
MATEC Web of Conferences, 2016 The formula of stochastic subspace identification method is deduced in details and the program is written out. The two methods are verified by a vibration test on a 5-floor rigid frame model.
Liu Dazhi +5 more
doaj +1 more source
Back projection algorithm-based GEO SAR real-time quick Look imaging system
The Journal of Engineering, 2019 Geosynchronous earth orbit synthetic aperture radar (GEO SAR) has the advantages of short revisit period and wide observation range. However, compared with low earth orbit SAR (LEO SAR), GEO SAR has the distinct characteristics of long synthetic aperture
Qingjun Zhang +6 more
doaj +1 more source
Spacecraft Anomaly Detection with Attention Temporal Convolution Network [PDF]
arXiv, 2023 Spacecraft faces various situations when carrying out exploration missions in complex space, thus monitoring the anomaly status of spacecraft is crucial to the development of \textcolor{blue}{the} aerospace industry. The time series telemetry data generated by on-orbit spacecraft \textcolor{blue}{contains} important information about the status of ...
arxiv
Research on nanosatellite thermal cycling test applicability
MATEC Web of Conferences, 2017 In order to verify the spacecraft performance in extreme temperature and vacuum, and to screen spacecraft early defect, generally spacecraft TV (Thermal Vacuum) test should be carried out before launch.
Li Xiyuan +5 more
doaj +1 more source
Journal of Mathematics, 2023 Predicting telemetry data is vital for the proper operation of orbiting spacecraft. The Grey–Markov model with sliding window (GMSW) combines Grey model (GM (1, 1)) and Markov chain forecast model, which allows it to describe the fluctuation of telemetry
Liang Ren +3 more
doaj +1 more source
Deflecting small asteroids using laser ablation : Deep space navigation and asteroid orbit control for LightTouch2 Mission [PDF]
, 2013 This paper presents a low-cost, low mass, mission design to successfully intercept and deflect a small and faint, 4 m in diameter asteroid. Intended to be launched after 2025, the laser-ablating mission, LightTouch2 will be used to deflect the orbit of ...
Branco, Joao +4 more
core +1 more source
Attitude dynamics and control of spacecraft using geomagnetic Lorentz force [PDF]
, 2014 The attitude stabilization of a charged rigid spacecraft in Low Earth Orbit (LEO) using torques due to Lorentz force in pitch and roll directions is considered. A spacecraft that generates an electrostatic charge on its surface in the Earth magnetic field will be subject to perturbations from Lorentz force.
arxiv +1 more source