Satellite Framework and Designing Strategy A Presentation.

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the principal anecdotal delineation of a fake satellite dispatched into Earth circle ... A low-earth circling (LEO) satellite together created by TRW of U.S. with an inhabitant ...
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Satellite System and Engineering Procedure-An Introduction Instructor: Roy C. Hsu Computer Science and Information Engineering Department National Chia-Yi University 10/05/2006

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OUTLINE Introduction Satellite System Engineering Procedure Cases Study

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INTRODUCTION Definition (from Wikipedia) A satellite is any article that circles another item (which is known as its essential ). Satellites can be artificial or might be normally happening, for example, moons , comets , space rocks , planets , stars , and even universes . A case of a characteristic satellite is Earth\'s moon.

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INTRODUCTION (Cont.) Human-made gadgets: counterfeit satellite From Science Fiction the primary anecdotal delineation of a manufactured satellite dispatched into Earth circle – by Jules Verne \'s The Begum\'s Millions ( 1879 ). Jules Gabriel Verne ( February 8 , 1828 – March 24 , 1905 ), a French creator and a pioneer of the sci-fi kind. Verne was noted for expounding on infinite , barometrical , and submerged go before air travel and submarines were ordinary and before reasonable method for space travel had been conceived. The primary simulated satellite was Sputnik 1 propelled by Soviet Union on 4 October 1957 .

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INTRODUCTION (Cont.) . rundown of nations with an autonomous ability to place satellites in circle, including generation of the essential dispatch vehicle.

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First dispatch by nation

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INTRODUCTION (Cont.) MISSION AND PAYLOAD Space mission: the reason for setting in gear (payload) and/or work force to complete exercises that can\'t be performed on earth Payload: outline of the hardware is unequivocally impacted by the particular mission, foreseen lifetime, dispatch vehicle chose, and the situations of dispatch and space.

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INTRODUCTION (Cont.) Possible missions Communications Earth Resources Weather Navigation Astronomy Space Physics Space Stations Military Technology Proving

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SATELLITE SYSTEM Space Segment Payload Bus Structure Attitude Determination And Control Thermal Propulsion Power Command and Telemetry Data Handling

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SATELLITE SYSTEM(Cont " d) A satellite framework is made out of the rocket (transport) and payload (s) A shuttle comprises of the accompanying subsystems Propulsion and Launch Systems Attitude Determination and Control Power Systems Thermal Systems Configuration and Structure Systems Communications Command and Telemetry Data Handling and Processing

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SATELLITE SYSTEM (cont " d) Propulsion and Launch Systems Launch vehicle : used to put a shuttle into space. Once the weight and volume of the rocket have been assessed, a dispatch vehicle can be chosen from an assortment of the makers. In the event that it is important to veer off from the direction gave by the dispatch vehicle or right for the mistakes in the underlying condition, extra drive era or impetus is fundamental On-board drive frameworks for the most part require a way to decide the position and demeanor of the rocket so that the required trust vectors can be accurately decided and connected.

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SATELLITE SYSTEM (cont " d) Attitude Determination and Control System (ADCS) ADCS are required to point the shuttle or a segment, for example, sun powered exhibit, recieving wire, impetus push pivot, and instrument sensor, in a particular bearing. State of mind determination can be refined by deciding the introduction w.r.t. the star, earth, inertial space, geomagnetic field and the sun. State of mind control can be either detached or dynamic or mix.

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SATELLITE SYSTEM (cont " d) Power Systems Spacecraft force can be gotten from the sun through sunlight based cell clusters and warm electrical generators and from on-board gadgets, for example, compound batteries, energy unit, and atomic theem-electronic and therm-ionic converters. Most satellites utilize a blend of sunlight based cell cluster and synthetic batteries.

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SATELLITE SYSTEM (cont " d) Thermal Control Systems The capacity of the warm control framework is to keep up temperatures to inside indicated limit all through the mission to permit the locally available frameworks to work legitimately and have a long life Thermal parity can be controlled by utilizing radiators, aloof or dynamic radiators, and warm covers of different emissivities on the outside.

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SATELLITE SYSTEM (cont " d) Configuration and Structure Systems The setup of a rocket is compelled by the payload ability and the state of the fairing of superfluous dispatch vehicle. Expansive structures ,, for example, sunlight based exhibits and reception apparatus are raised in the space through deployable parts. Touchy gadgets , enacted by timing gadgets or order, are utilized to isolated the shuttle from the dispatch vehicles, discharge and send components, and cut links.

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SATELLITE SYSTEM (cont " d) Command and Telemetry The Command and Telemetry framework give data to and from the S/C separately. Charges are utilized to give data to change the condition of the subsystems of the S/C and to se the clock. The Telemetry subsystem gathers and procedures an assortment of information and tweaks the sign to be transmitted from the S/C.

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SATELLITE SYSTEM (cont " d) Data Handling and Processing Data preparing is vital to control and reconfigure the rocket to upgrade the general framework execution and to process information for transmission . Comprises of processor(s), RAM, ROM, Data Storage, and executed by machine, get together or abnormal state dialect. Low mass, volume, and force necessities, lack of care to radiation, and extraordinary unwavering quality are essential attributes of processor.

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SATELLITE SYSTEM (cont " d) Communications Radio recurrence correspondence is utilized to transmit data between the S/C and physical locales and maybe different S/Cs. Data transmitted from the S/C incorporate the state and soundness of the subsystems notwithstanding information from the essential instruments. Data transmitted to the S/C for the most part comprises of information to be put away by on-load up processors and summons to change the condition of the on-load up framework either progressively or through electronic rationale that execute them as a component of time or as required.

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Engineering Procedures Space Systems Engineering System Definition System, Subsystem, Components, and Parts A vast accumulation of subsystems is known as a fragment. In a space mission, the rocket, the dispatch vehicle, the following stations, the mission control focus, and so forth., may each be viewed as a framework or section by their standard engineers yet are subsystems of the general framework. Estimation of a System " s capacity to fulfill criteria for the most part called framework level prerequisites or measures for judgment.

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Engineering Procedures (Cont " d) Engineering a Satellite Mission Needs Conceptualization and framework prerequisites Planning and Marketing Research and Technology Development Engineering and Design Fabrication and Assembly Integration and Test Deployment, operation and eliminate

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Engineering Procedures (Cont " d) Mission Needs Conceptualization and framework necessities Planning and Marketing Research and Tech. Improvement Engineering and Design Fabrication and Assembly Integration and Test Development, Operation And Phase-out

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SMALL SATELLITE CASE STUDY ROCSAT-1 A low-earth circling (LEO) satellite mutually created by TRW of U.S. with an occupant group of NSPO designers. Dispatched on January 27, 1999 into a circle of 600 kilometers height and 35 degrees slant. Three investigative exploration missions/Payloads: sea shading imaging/OCI, probes ionospheric plasma and electrodynamics/IPEI, tests utilizing Ka-band (20-30 GHz) correspondence payloads/ECP.

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ROCSAT-1 COMMAND AND TELEMETRY SYSTEM S-band Consultative Committee for Space Data Systems (CCSDS) Packet Telcommand and Telemetry Uplink information rate: 2 kbps Downlink information rate: 1.4 mbps Data stockpiling: 2 gb

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ROCSAT-1 Telemetry Processing Overview GPSE Spacecraft Subsystems Spacecraft 1553 BUS RF Assembly Transponder TIE OBC IPEI Science Data RS 422 Recorded/Playback Data OCI Science Data RS 422 Serial SSR RIU ECP Downlink FDF SDDCs TT&C Station MOC SSC Ground

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ROCSAT-1 DATA HANDLING SYSTEM On Board Computer ( OBC ) : 80C186 CPU Real-time operation framework: Versatile Real-Time eXecutive ( VRTX 32/86 ), a continuous multi-tasking OS Employing programming building approach for the improvement of the flight programming. A constant implanted framework

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Microsatellite Case Study-MOST The MOST (Microvariability and Oscillations of Stars) cosmology mission is Canada\'s first space science microsatellite and Canada\'s first space telescope. Satellite\'s main goal: to lead long-span stellar photometry perceptions in space An auxiliary payload on a Delta II dispatch vehicle (with Radarsat-2 as the essential payload).

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Case Study-MOST (Cont " d) Payload: a 15cm measurement opening Maksutov telescope Team drove by Dr. Matthews of Department of Physics and Astronomy, University of British Columbia Spacecraft: Dynacon Inc. as prime contractual worker for PM and the Attitude Control and Power subsystems architect Institute for Aerospace Studies\' Space Flight Laboratory, Univ. of Toronto: structure, warm, on-board PCs and telemetry & summon, alongside the ground stations taking after AMSAT-NA), with backing from AeroAstro

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MOST ARCHITECTURE (Cont " d) AMSAT based plans housekeeping com

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