A backup system of a spacecraft orientation based on ...
Recommend Documents
A fault-tolerant system is designed to be based on the disk resident database ... tecture to reduce overhead for recovery using such RAMS and disks is discussed. ..... Since a system is not safe if the crash occurs while taking the next checkpoint ..
This document focuses on the backup, failover, and recovery of a virtual ... cloud computing offers considerable opportunities, especially in the area of backup [2].
space system (both fractionated and monolithic) sub- ject to a ... candidate systems [6]. Lockheed ..... posed by Lockheed Martin is used for its simplicity and.
Jul 5, 2001 - d=500 km; γ =cp/cv=2), a pressure imbalance of 10% will produce an acceleration of about 8 km/s2 but an accompany- .... The distance travelled by the magnetopause, between crossing ... nents of m and, since |n|2=1, we then obtain the v
Jun 23, 2004 - Phone:+34-93-4015894, Fax:+34-93-4016447 ... Contents. 1 Introduction. 3. 1.1 Navigation system structure . ..... on frequency), and the background radiation from the Galaxy, Tga1, plus a time-variable contribution from.
PowerPath⢠controller that simplifies the design of backup systems. ... Backup Power Application. Figure 1 ... Designi
Aug 20, 2007 - 2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany. 3 Institut ... The near-infrared emission from the black hole at the Galactic center (Sgr A*) has unique ... This agrees well with recent independent w
May 29, 2014 - In order to solve the problems of the existing wide-area backup protection (WABP) algorithms, the paper proposes a novel WABP algorithm ...
Dec 10, 2010 - Coordinator and Backup Automatic Election in Distributed Systems. Tarek Helmy*. College of Computer Science and Engineering. King Fahd ...
ing (WDM) Optical Networks [11], Virtual Paths (VPs) in ... the same dedicated bandwidth over the backup path as the ... cific server for data transcoding. Second ...
Oct 27, 2016 - voltage and current measurements to provide primary and backup protection for HVDC grids. The proposed algorithm collects the current and ...
Jan 17, 2018 - ponents have many obvious advantages: a negligible mass, accurate placement, applicability to a variety of materials including ceramics,.
communication system that can have very low bandwidth in the order 10 Kbps or less, but be ..... and coordinate with satellites that monitor threats to Earth including incoming meteors ... architecture using multiple quantum wells for free-space.
Mar 9, 2010 - California Polytechnic State University, San Luis Obispo. Kinnett ..... Michigan, Utah State University, t
Mar 9, 2010 - After lengthy discussions with a ConnectTech, Inc. technical .... to connect to the platform computer and
Thompson (2003: 34) further developed a twenty question character theme ... 'Create' is used to place emphasis on the entrepreneur starting something new.
Using a computer hard drive as memory storage, time stamped data can be stored and past data can be reviewed at any time for real-time data comparison.
[1] T. H. Barton, Rectifiers, cycloconverters and AC controllers. ( Clarendon Press, Oxford, 1994). [2] I. Boldea, S. A. Nasar, Vector control of AC drives (CRC ...
AbstractâThis paper explores integrating a reputation-based trust mechanism with an agent-based backup protection system to help protect against malicious ...
and to use them. A way to reduce the effort of reusable components search, ... tools and a library of .... a rectangular form annotated by the domain name ~.
published independently (Cribb 2004; Apple Daily 2000, as cited in .... size and varying methods of survey distribution help to assuage such .... 6 This category included the International Baccalaureate Diploma, the British General Certificate of.
Online learning is now a reality thanks to the development of Internet and to the virtual environments commonly called LMS (Learning Management System).
Dec 11, 2013 - http://www.tandfonline.com/loi/nile20. Development of a mobile learning system based on a collaborative problem-posing strategy. Han-Yu ...
On the one hand, it is necessary to determine the set of words and linguistic ..... Word error rate and recognition time are inversely-related measures. Generally ...
A backup system of a spacecraft orientation based on ...
A reliable control of current orientation of a spacecraft is a very important task in aerospace engineering. This makes important to elaborate a backup or ...
A backup system of a spacecraft orientation based on temperature measurements at the design elements of various orientations Aleksey V. Nenarokomova, Irina V. Krainovaa, Evgeny V. Chebakova, Dmitry L. Reviznikova, and Leonid A. Dombrovskyb a
Moscow Aviation Institute, Volokolamskoe Hgw. 4, Moscow, 125993, Russia b Joint Institute for High Temperatures, NCHMT, Moscow, 111116, Russia
A reliable control of current orientation of a spacecraft is a very important task in aerospace engineering. This makes important to elaborate a backup or replacement system which can be used for the verification or correction of the orientation. It seems natural to use various conditions of radiative heating of the design elements of different orientations with respect of the Sun and strongly radiating or reflecting planets of the Solar system. In the case of an ordinary slow variation of the vehicle orientation in space, the temperature measurements can be used to distinguish different integral (over the spectrum) radiative flux to various surfaces of a specially designed thermal sensor with several facets. An analysis of a possibility of such an engineering solution is a subject of the present study. The mathematical problem to be solved is one of the so-called inverse heat transfer problems, and its solution is not a simple task. Therefore, the main efforts of the authors are focused on solution of this ill-posed problem. The known methods of the inverse problem regularization are modified to take into account special features of the heat transfer problem under consideration. The resulting algorithm is verified using the typical case problems. It was shown that one can obtain sufficiently accurate results on the bases of a limiting set of relatively simple temperature measurements. Even the measurements at three facets may give a good estimate of the spacecraft orientation. The latter enables us to consider the method suggested as a promising way to elaborate a series simple backup/replacement system of an approximate retrieval of a spacecraft current orientation. This statement is confirmed by calculation for one of the typical trajectory of a vehicle in the Solar system.
