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Topic: Tracking and Data Relay Satellite

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	NASA's TDRS Program
		TDRSS is a communication signal relay system which provides tracking and data aquisition services between low earth orbiting spacecraft and control and/or data processing facilities.
		Forward data is uplinked from the ground segment to the TDRS and from the TDRS to the spacecraft.
		Return data is downlinked from the spacecraft via the TDRS to the ground segment and then on to the designated data collection location.
	nssdc.gsfc.nasa.gov /multi/tdrs.html (195 words)

	TDRSS (Tracking and Data Relay Satellite System)
		In addition, TDRSS provides data relay services to Antarctic facilities, such as McMurdo Station, by way of the TDRSS South Pole Relay, and launch data relay for expendible boosters, including Atlas IIA and rockets launched from the Sea Launch platform.
		The Inertial Upper Stage intended to lift the satellite to geostationary orbit didn't work properly, as a result of which TDRS 1 had to use its onboard thrusters to reach its correct orbit.
		Return data is downlinked from the customer spacecraft via the TDRS to the ground segment and then on to the customer designated data collection location.
	daviddarling.info /encyclopedia/T/TDRSS.html (377 words)

	Military Communications Satellite
		Though the TDRSS satellites pass commands to spacecraft to adjust their positions by firing a thruster, to turn a camera or heater or other on-board equipment on or off, to start or stop observations, and to begin or stop transmissions to the Earth.
		Tracking and Data Relay Satellite (TDRS)-E is the fifth in a series of communications spacecraft planned for the Tracking and Data Relay Satellite System (TDRSS).
		The satellite communications system was initiated following studies in the early 1970s which showed that a system of telecommunication satellites operated from a single ground station could better support the space shuttle and scientific application mission requirements planned for the Nation's space program.
	www.fas.org /spp/military/program/com/tdrss.htm (1932 words)

	TDRSS Overview
		The system is capable of transmitting to and receiving data from customer spacecrafts over 100% of their orbit (some limitations may apply depending on actual orbit).
		Return data is downlinked from the customer spacecraft via the TDRS to the ground segment and then on to the customer designated data collection location.
		Data relayed through TDRS has been critical to scientists investigating both near and deep space phenomena and earth science.
	msp.gsfc.nasa.gov /tdrss/oview.html (1911 words)

	Situation of "Kodama"(Data Relay Test Satellite: DRTS)
		A data relay satellite system requires technologies to acquire the target spacecraft accurately and rapidly and to track it continuously.
		Kodama has been developed to provide high-accuracy Ka-band program tracking function to simplify initial acquisition of the satellite by programmatically calculating the direction of the target spacecraft in advance, in addition to RF Auto-tracking function to perform acquisition and tracking by detecting the signal of the target spacecraft.
		Especially, in March 2004, as part of the preparation for ALOS operation, the end-to-end experiments were performed between actual ALOS satellite under experiment at Tsukuba Space Center and "Kodama" on the orbit, and it was confirmed that the data transmission speed could exceed 240Mbps, a planned orbital experimental target (fig.3).
	www.jaxa.jp /press/2004/06/20040602_sac_drts_e.html (1066 words)

	Boeing to Ship NASA's Tracking and Data Relay Satellite to Florida for March Launch
		The Boeing 601 satellite, named TDRS-I, is the second of three satellites built and delivered by Boeing Space and Communications (S&C), a unit of The Boeing Company, for NASA Goddard Space Flight Center of Greenbelt, Md.
		The third satellite, TDRS-J, is scheduled for delivery in October 2002.
		A Boeing modified 601 satellite was successfully launched today on an Atlas IIAS vehicle at Cape Canaveral AS, Fla. Liftoff occurred at 12:41 a.m.
	www.spacedaily.com /news/tdrs-birds-02a.html (287 words)

	MODIS Website
		Its detectors measure 36 spectral bands between 0.405 and 14.385 µm, and it acquires data at three spatial resolutions -- 250m, 500m, and 1,000m.
		The data are then sent to the EOS Data and Operations System (EDOS) at the Goddard Space Flight Center.
		The many data products derived from MODIS observations describe features of the land, oceans and the atmosphere that can be used for studies of processes and trends on local to global scales.
	modis.gsfc.nasa.gov /data (379 words)

	Spaceflight Now \| Atlas Launch Report \| Atlas 2A rocket launches NASA data relay satellite
		With their new Ka-band relay package, an addition from earlier TRW-built TDRS satellites, the data rate capability has increased to 800 million bits per seconds rather than 300 million bits per seconds provided through other means, and is less susceptible to interference from the increasingly busy radio environment.
		The high data rate services using the satellite's 15-foot-diameter Single Access antennas were not impacted by the flaw.
		The TDRS-J satellite is being prepared for launch in November aboard the final flight of the Atlas 2A rocket, which is currently the smallest and least powerful version of the Lockheed Martin Atlas family currently in operation.
	www.spaceflightnow.com /atlas/ac143 (1878 words)

	Data Communication - Satellite Communication
		Communication satellites are relay stations used for transmitting the information which are having line-of-sight restrictions.
		The signals (original) being transmitted from the earth station to the satellite is called “uplink” and the retransmitted signal from the satellite to the receiving station is called the “down link”.
		Transponder is a term used for transmitter – receiver combination in the satellite and its basic functions are amplification and frequency transmission.
	www.ligaturesoft.com /data_communications/satellite-communication.html (312 words)

	Challenger Center: STS-51L: Challenger Missions
		The Challenger Shuttle's primary payload was the second of NASA's Tracking and Data Relay satellites (TDRS).
		Working in concert with the first Tracking and Data Relay satellite (which was deployed in 1983 by an earlier Challenger mission), the two satellites were expected to provide about 85 percent real time coverage of each orbit of a user spacecraft.
		The objective is to try to get this data as the comet approaches perihelion, which is just as it goes around behind the sun and starts to head back out.
	www.challenger.org /about/mission51-l.cfm (631 words)

	Tracking and Data Relay Satellite
		Release No. 91-41 June 7, 1991 Current Status and History The Tracking and Data Relay Satellite (TDRS)-E is the fifth in a series of communications spacecraft planned for the Tracking and Data Relay Satellite System (TDRSS).
		The satellite communications system was initiated following studies in the early 1970s which showed that a system of telecommunication satellites operated from a single ground station could better support the space shuttle and scientific application mission requirements planned for the Nation's space program.
		The equipment module housing the subsystems that operate the satellite is located in the lower hexagon of the spacecraft.
	www.friends-partners.org /oldfriends/jgreen/tdrss.html (1010 words)

	Dictionary: Tracking and Data Relay Satellite System
		The Tracking and Data Relay Satellite System (TDRSS) is a communication signal relay system, developed by NASA, that relays data to ground stations and tracks satellites in orbit.
		The system provides tracking and data acquisition services between low Earth orbiting spacecraft and NASA or other ground data processing facilities.
		It also receives data from the on-orbit satellites that it transmits to stations on the ground located near Las Cruces, New Mexico.
	www.centennialofflight.gov /essay/Dictionary/TDRSS/DI176G1.htm (124 words)

	NASM Space Artifacts: Tracking and Data Relay Satellite (Site not responding. Last check: 2007-10-27)
		The Tracking and Data Relay Satellite (TDRS) system, a constellation of six spacecraft placed into geosynchronous orbit beginning in 1983, was designed to replace this expensive, far-flung system of tracking, telemetry, and control for space operations.
		The satellites transmit voice and data communications--under optimum conditions TDRS can transfer in a second the equivalent of a 20 volume encyclopedia.
		The three-axis stablized TDRS is one of the largest, most complex sateliites in use, weighing nearly 5,000 pounds and measuring 57 feet across at the solar panels.
	www.nasm.si.edu /research/dsh/artifacts/CS-TDRS.htm (164 words)

	Hubble.y2u.co.uk - Hubble Space Telescope - Lots of Info
		Once approved, data about the observation is sent to Goddard's Space Telescope Operations Control Center, which determines the exact schedule of daily observations and sends commands to the telescope's computer, via the Tracking Data Relay Satellite (TDRS) system with ground station in White Sands, New Mexico.
		Data from the telescope is collected and analyzed by astronomers and scientists at STScI.
		Parts of the main mirror and its support structure are expected to survive, leaving the unfortunate potential for damage or even human fatalies (estimated at up to a 1 in 700 chance of human fatality for a completely uncontrolled reentry).
	hubble.y2u.co.uk (3252 words)

	STS-29
		Primary payload, Tracking and Data Relay Satellite-4 (TDRS-4) attached to an Inertial Upper Stage (IUS), became third TDRS deployed.
		After deployment, IUS propelled satellite to geosynchronous orbit.
		USAF Satellite Database, USAF Institute of Technology, 1995.
	www.astronautix.com /flights/sts29.htm (245 words)

	TDRS -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-27)
		Initial satellites were built by (Click link for more info and facts about TRW) TRW, later versions have been put together by (Click link for more info and facts about Boeing) Boeing's (Click link for more info and facts about Satellite Systems) Satellite Systems division.
		The first TDRS was launched in 1983 on the (Click link for more info and facts about Space Shuttle Challenger) Space Shuttle Challenger's first flight, (Click link for more info and facts about STS-6) STS-6.
		Three Boeing-built successors were launched on (Click link for more info and facts about Atlas rocket) Atlas rockets in 2000 and 2002.
	www.absoluteastronomy.com /encyclopedia/t/td/tdrs3.htm (142 words)

	NASA - Missions -- Current
		GOES-N is the latest in a series of satellites that provide a constant vigil for the atmospheric "triggers" for severe weather conditions such as tornadoes, flash floods, hail storms, and hurricanes.
		The Polar Mission is to obtain data from both high- and low-altitude perspectives of the polar region of geospace.
		RXTE is a satellite that observes the fast-moving, high-energy worlds of fl holes, neutron stars, X-ray pulsars and bursts of X-rays that light up the sky and then disappear forever.
	www.nasa.gov /missions/current (1349 words)

	vehicle tracking online shopping directory / international shopping guide - find info on online shops here
		Advanced Tracking Technologies, Inc. - Manufacture a personal GPS vehicle tracking device used to monitor and report a vehicles daily route, mileage and speed driven.
		Applied Data - Ingle board computers for telematics and AVL funtions, suited for fleets of commercial vehicles and mobile equipment.
		Track Your Truck - Vehicle tracking services that capitalize on satellite and cellular technologies that supports text messaging with a web-based application.
	www.shoppinglinker.com /auto_vehicletracking.html (2978 words)

	John F. Kennedy Space Center - TDRS: Tracking and Data Relay Satellite System
		The Tracking and Data Relay Satellite (TDRS) system represents a new era in tracking Earth-orbiting spacecraft, including the Space Shuttle, and transmitting their data back to Earth.
		In the event of a malfunction of one of the fully operational TDRS spacecraft, the absence of a third fully operational satellite in ready reserve would severely impact orbiting spacecraft for nearly a year before an emergency replenishment launch could take place.
		Successful deployment of this TDRS, which will become TDRS-6 in orbit, will fulfill the requirement for two fully operational satellites and a fully operational on- orbit, ready-reserve capability, and ensure that communications, telemetry and data acquisition capabilities required by space missions will not be jeopardized.
	www-pao.ksc.nasa.gov /kscpao/nasafact/tdrsmain.htm (417 words)

	GPS Tracking Devices - GPS Systems for mobile assets, gps tracking for fixed assets by Geosoft USA Corp
		GPS data is made available on-board the MTG for transmission to a centralized operations center or web page or to a localized computer or MDT.
		The wireless data and voice port are also available for the localized user for e-mail or voice communication.
		This mobile asset tracking and reporting communicator is good for commercial fleet management or private vehicle location systems.
	www.geosoftusa.com /gps-devices.htm (627 words)

	TDRSS Program
		This NASA communication relay system which provides links between low earth orbiting spacecraft and the ground.
		The system provides extended view times for LEO satellite communications links, and is capable of transmitting to and receiving data from any LEO spacecraft over at least 85% of its orbit.
		The TDRSS space segment currently consists of six first generation Tracking and Data Relay Satellites (TDRS) located in geosynchronous orbit, of which 3 are available for operational support at any given time.
	msl.jpl.nasa.gov /Programs/tdrss.html (239 words)

	NASA - Looking for a current NASA Mission?
		IMAGE is a mission to study the global response of the magnetosphere to the changes in solar wind.
		SOHO is designed to study the internal structure of the Sun, its extensive outer atmosphere and the origin of the solar wind.
		The Upper Atmosphere Research Satellite (UARS) was launched in 1991 by the Space Shuttle Discovery and orbits at an altitude of 375 miles.
	www.nasa.gov /missions/timeline/current/current_missions.html (1232 words)

	BOEING TO SHIP NASA's TRACKING AND DATA RELAY SATELLITE TO FLORIDA FOR MARCH LAUNCH
		SEAL BEACH, Calif., Jan. 30, 2002 -- A Boeing-built Tracking and Data Relay Satellite (TDRS) will ship today via a C-17 aircraft to Kennedy Space Center, Fla., to undergo final preparations for its March launch aboard an Atlas IIA rocket.
		The Boeing 601 satellite, named TDRS-I, is the second of three satellites built and delivered by Boeing Space and Communications (S&C), a unit of The Boeing Company (NYSE: BA), for NASA Goddard Space Flight Center of Greenbelt, Md.
		Boeing Space and Communications, headquartered in Seal Beach, Calif., is the world's largest space and communications company.
	www.boeing.com /defense-space/space/bss/hsc_pressreleases/02_01_30_tdrs.html (274 words)

	STS-6
		Payloads: Deployment of Tracking and Data Relay Satellite (TDRS)-A with Inertial Upper Stage (lUS)-2, Continuous Flow Electrophoresis System (CFES), Monodisperse Latex Reactor (MLR), Night/Day Optical Survey of Lightning (NOSL) experiment, three getaway specials (GAS).
		Additional delay caused by contamination to Tracking and Data Relay Satellite-1 (TDRS-1) during a severe storm.
		Primary payload was first Tracking and Data Relay Satellite-1
	www.astronautix.com /flights/sts6.htm (459 words)

	Model of the Tracking and Data Relay Satellite
		Model of the Tracking and Data Relay Satellite
		This is a model of the Tracking and Data Relay Satellite (TDRS) (© 1993 Smithsonian Institution)
		Last modified prior to September, 2000 by the Windows Team
	www.windows.ucar.edu /tour/link=/missions/images/TDRSS_image.html&_ylu=X3oDMTBwdTQxbTI5BGNvbG8DZQRwb3MDOQRzZWMDc3IEdnRpZAM-/SIG=19kf31por/EXP=1152438246/**http:/216.109.125.130/search/cache (69 words)

	CelesTrak: Current NORAD Two-Line Element Sets
		Anonymous ftp of the current data is no longer available.
		An index showing the composition of each two-line element set data file (all data is contained in the files above)—use it to find which
		This index also includes links describing many satellite payloads.
	celestrak.com /NORAD/elements (61 words)

	Telsat® Communications Ltd TVRO Satellite TV Web Page. (Site not responding. Last check: 2007-10-27)
		Telsat® Communications Ltd TVRO Satellite TV Web Page.
		Indian Television Dot Com - India's cable, satellite, terrestrial, broadcasting TV portal
		Cable & Satellite Asia - Singapore 9-11th Dec, 2001.
	www.telsat.com /url.htm (630 words)

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