Results 61 to 70 of about 4,477,022 (227)
International Journal of Aerospace Engineering, 2022 This work addresses the finite-time orbit control problem for spacecraft formation flying with external disturbances and limited data communication. A hysteretic quantizer is employed for data quantization in the controller-actuator channel to decrease ...
Lei Xing +3 more
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A hardware-in-the-loop testbed for spacecraft formation flying applications [PDF]
2001 IEEE Aerospace Conference Proceedings (Cat. No.01TH8542), 2002 The Formation Flying Test Bed (FFTB) at NASA Goddard Space Flight Center (GSFC) is being developed as a modular, hybrid dynamic simulation facility employed for end-to-end guidance, navigation, and control (GNC including a high-fidelity GPS simulator which has been a fundamental component of the Guidance, Navigation, and Control Center's GPS Test ...
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Meteoritics &Planetary Science, EarlyView.Abstract The OSIRIS‐REx mission collected a 121.6 g regolith sample from the surface of asteroid Bennu. Preliminary examination (PE) was conducted jointly by JSC Curation and the OSIRIS‐REx Sample Analysis Team. To enable advanced, non‐destructive characterization during PE, 59 centimeter‐scale stones were individually scanned using X‐ray computed ...
Scott A. Eckley +22 more
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Complexity, 2020 This paper investigates the fixed-time coordinated control problem of six-degree-of-freedom (6-DOF) dynamic model for multiple spacecraft formation flying (SFF) with input quantization, where the communication topology is assumed directed. Firstly, a new
Shiyu Wang, Ruixia Liu, Lihua Wen
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Control topologies for deep space formation flying spacecraft
Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301), 2002 2002 American Control Conference (ACC)
Roy S. Smith, Fred Y. Hadaegh
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Meteoritics &Planetary Science, EarlyView.Abstract Regolith samples from the carbonaceous asteroid Bennu were stowed and delivered to Earth in the OSIRIS‐REx spacecraft's Sample Return Capsule (SRC). We applied multiple analytical techniques to study the components of the post‐flight SRC, with a focus on assessing the conditions and any contaminants to which the Bennu samples were exposed ...
Scott A. Sandford +35 more
wiley +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract This study investigates the spatial distribution and spectral characteristics of the broad hydration feature near 3 μm across the surface of asteroid (101955) Bennu using OVIRS (OSIRIS‐REx Visible and InfraRed Spectrometer) data. We analyzed multiple global OVIRS data sets obtained at different times throughout the Bennu day, revealing ...
Hannah H. Kaplan +5 more
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Meteoritics &Planetary Science, EarlyView.Abstract Apatite is often the most rare earth element (REE)‐enriched mineral in chondritic meteorites. REE enrichment and fractionation levels in apatite grains can give insight into the aqueous fluids in which they formed and the conditions prevailing within the host body. In this study, we applied synchrotron X‐ray fluorescence (SXRF) spectroscopy to
B. J. Tkalcec +17 more
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Real time hardware in the loop simulation testbed of spacecraft formation flying
, 2008 The great potential benefits associated with SFF (satellite formation flying) have led to considerable research in this concept around the world. As it is a new field of research and the implementation of formation flying in practice brings some inherent
Ahmed, Riaz
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Fuzzy Sliding Mode for Spacecraft Formation Control in Eccentric Orbits [PDF]
فصلنامه علوم و فناوری فضایی, 2014 The problem of relative motion control for spacecraft formation flying in eccentric orbits is considered in this paper. Due to the presence of nonlinear dynamics and external disturbances, a robust fuzzy sliding mode controller is developed.
A. Imani, M. Bahrami
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