Science Current Events | Science News | Brightsurf.com
 

TDRS-4 Mission Complete; Spacecraft Retired From Active Service

May 09, 2012
The Tracking and Data Relay Satellite 4 (TDRS-4) recently completed almost 23 years of operations support and successfully completed end-of-mission de-orbit and decommissioning activities. TDRS-4's operational life span was well beyond its original 10-year design.

Launched on March 13, 1989, from onboard Space Shuttle Discovery, TDRS-4 operated in geosynchronous (GEO) altitude at more than 22,000 miles above the Atlantic Ocean region. As part of the spacecraft's end-of-mission activities, its orbit was raised above the congested geosynchronous orbit.

TDRS-4 was forced to retire after the loss of one of three Nickel-Cadmium (24 cell) batteries and the reduction in storage capacity for the two remaining batteries that power the satellite. Retirement for the satellite consisted of excess fuel depletion, disconnecting batteries, and powering down the Radio Frequency Transmitters and receivers so that the satellite is completely and permanently passive. This ensures the satellite will never interfere with other satellites from the radio frequency perspective.

This is the second retirement from within the fleet of TDRS. The fleet of seven remaining satellites operates through a supporting ground system and together they make up the Space Network (SN). The SN provides highly automated, user-driven services supporting customer spacecraft with tracking and data acquisition. The network supports a varied number of missions, including the International Space Station, Hubble Space Telescope, launch vehicles, and a variety of other science missions. The SN also provided primary communication support to the Space Shuttle Project.

"The Space Network spacecraft engineering and operations teams worked together very effectively to execute a practically flawless decommissioning of an incredible satellite," says Mike Rackley, SN deputy project manager at NASA's Goddard Space Flight Center, Greenbelt, Md. "TDRS-4 made great and important contributions to NASA's human spaceflight and science missions. We will certainly miss her."

This is the second end-of-mission execution for the fleet of aging first generation TDRS spacecraft. TDRS-4's retirement was preceded by TDRS-1, which was decommissioned and raised to its permanent orbit in June 2010.

A total of six first generation spacecraft were successfully placed into orbit from April 1983 through July 1995, of which four are still active. The spacecraft are approaching the end of their operational life span but they are supplemented by three, second-generation spacecraft.

Together they provide customers with global space to ground communication services.

To continue this critical lifeline, NASA has contracted Boeing to build three additional follow-on TDRS spacecraft, replenishing TDRS-1 and TDRS-4, and expanding NASA's communication services. TDRS-K is scheduled for launch in December of this year followed by TDRS-L in 2013 and TDRS-M in 2015.

The SN is managed by GSFC and its primary ground communications facility is located at the White Sands Complex in Las Cruses, NM. The Human Exploration and Operations Mission Directorate and the Space Communications and Navigation Program at NASA Headquarters fund NASA's Space Network.

NASA's Goddard Space Flight Center


Related Tracking And Data Relay Satellite Current Events and Tracking And Data Relay Satellite News Articles


NASA Accepts Third Generation TDRS Into Network
NASA has accepted ownership of its newest Tracking and Data Relay Satellite (TDRS) from Boeing after successfully completing in orbit testing. TDRS-K, will be renamed TDRS-11 upon entry into service.

All systems go for next communication spacecraft
The most recent evaluations of NASA's Tracking and Data Relay Satellite (TDRS) project confirmed all systems go for a third generation upgrade of the orbiting communications network.

NASA's GLAST Satellite Gets Twin Solar Panels in Prep for Launch
Preparations for launching NASA's Gamma-ray Large Area Telescope (GLAST) satellite are underway at NASA's Kennedy Space Center (KSC), Fla. NASA KSC's "NASA Expendable Launch Vehicle Status Report" on Thursday, March 20, noted that GLAST's twin solar panels have been attached.
More Tracking And Data Relay Satellite Current Events and Tracking And Data Relay Satellite News Articles

Tracking and data relay satellite system: hearing before the Subcommittee on Space Science and Applications of the Committee on Science and ... Congress, second session, September 21, 1976

Tracking and data relay satellite system: hearing before the Subcommittee on Space Science and Applications of the Committee on Science and ... Congress, second session, September 21, 1976
by United States. Congress. House. Committee on Science and Technology. Subcommittee on Space Science and Applications. (Author)




NASA History Series: "Read You Loud and Clear!" The Story of NASA's Spaceflight Tracking and Data Network (NASA SP-2007-4232) Mercury, Apollo, Shuttle, Ground Stations, TDRSS, Satellites

NASA History Series: "Read You Loud and Clear!" The Story of NASA's Spaceflight Tracking and Data Network (NASA SP-2007-4232) Mercury, Apollo, Shuttle, Ground Stations, TDRSS, Satellites
by Progressive Management


This official NASA history series document - converted for accurate flowing-text e-book format reproduction - is a historical account of the STDN, starting with its formation in the late 1950s to what it is today in the first decade of the twenty-first century. It traces the roots of the tracking network from its beginnings at the White Sands Missile Range in New Mexico to the Tracking and Data Relay Satellite System (TDRSS) space-based constellation of today. The story spans the early days of satellite tracking using the Minitrack Network, through the expansion of the Satellite Tracking And Data Acquisition Network (STADAN) and the Manned Space Flight Network (MSFN), and finally, to the Space and Ground Networks of today.

Written from a nontechnical perspective, the author has...

Satellite Communications Payload and System

Satellite Communications Payload and System
by Teresa M. Braun (Author)


This is the first book primarily about the satellite payload of satellite communications systems. It represents a unique combination of practical systems engineering and communications theory. It tells about the satellites in geostationary and low-earth orbits today, both the so-called bent-pipe payloads and the processing payloads. The on-orbit environment, mitigated by the spacecraft bus, is described. The payload units (e.g. antennas and amplifiers), as well as payload-integration elements (e.g. waveguide and switches) are discussed in regard to how they work, what they do to the signal, their technology, environment sensitivity, and specifications. At a higher level are discussions on the payload as an entity: architecture including redundancy; specifications--what they mean, how they...

Satellite Orbits: Models, Methods and Applications

Satellite Orbits: Models, Methods and Applications
by Oliver Montenbruck (Author), Eberhard Gill (Author)


This modern presentation guides readers through the theory and practice of satellite orbit prediction and determination. Starting from the basic principles of orbital mechanics, it covers elaborate force models as well as precise methods of satellite tracking. The result is a powerful and unique spaceflight dynamics library, which allows users to easily create software extensions. An extensive collection of frequently updated Internet resources is provided through WWW hyperlinks.

Satellite Communications Systems: Systems, Techniques and Technology

Satellite Communications Systems: Systems, Techniques and Technology
by Gerard Maral (Author), Michel Bousquet (Author), Zhili Sun (Editor)


Revisions to 5th Edition by: Zhili Sun, University of Surrey, UKNew and updated edition of this authoritative and comprehensive reference to the field of satellite communications engineeringBuilding on the success of previous editions, Satellite Communications Systems, Fifth Edition covers the entire field of satellite communications engineering from orbital mechanics to satellite design and launch, configuration and installation of earth stations, including the implementation of communications links and the set-up of the satellite network. This book provides a comprehensive treatment of satellite communications systems engineering and discusses the technological applications. It demonstrates how system components interact and details the relationship between the system and its...

Astronomy: A Self-Teaching Guide, Seventh Edition (Wiley Self-Teaching Guides)

Astronomy: A Self-Teaching Guide, Seventh Edition (Wiley Self-Teaching Guides)
by Dinah L. Moche (Author)


Discover the wonders of the night sky with this bestselling Astronomy GuideFor a generation, Astronomy: A Self-Teaching Guide has introduced hundreds of thousands of readers worldwide to the night sky. Now this classic beginner's guide has been completely revised to bring it up to date with the latest discoveries.Updated with the latest, most accurate information and more than 100 new graphics and photos, this Seventh Edition features:Web site addresses throughout for the best color images and astronomy resources onlineTechnical ideas made simple without mathematicsA beautiful new full-color, glossy insert with spectacular astro-imagesAn interactive format with learning goals, reviews, self-tests, and answers for fast learningFive beginners' Star and Moon maps for fun stargazingDinah L....

"What Do You Care What Other People Think?": Further Adventures of a Curious Character

"What Do You Care What Other People Think?": Further Adventures of a Curious Character
by Richard P. Feynman (Author), Ralph Leighton (Editor)


The New York Times best-selling sequel to "Surely You’re Joking, Mr. Feynman!" One of the greatest physicists of the twentieth century, Richard Feynman possessed an unquenchable thirst for adventure and an unparalleled ability to tell the stories of his life. "What Do You Care What Other People Think?" is Feynman’s last literary legacy, prepared with his friend and fellow drummer, Ralph Leighton. Among its many tales—some funny, others intensely moving—we meet Feynman’s first wife, Arlene, who taught him of love’s irreducible mystery as she lay dying in a hospital bed while he worked nearby on the atomic bomb at Los Alamos. We are also given a fascinating narrative of the investigation of the space shuttle Challenger’s explosion in 1986, and we relive the moment when...

The New Space Network: The Tracking and Data Relay Satellite System

The New Space Network: The Tracking and Data Relay Satellite System
by W. Froehlich (Author), Nasa Technical Reports Server (Ntrs) (Creator)


When the Tracking and Data Relay Satellite System (TDRSS)is completed, the system, together with its various NASA support elements will be known simply as the Space Networks. It will substantially increase information exchanges between low-orbiting spacecraft and the ground. The structural design, functions, earth-based links, and present and future use are discussed.

Space: Methodology Used in Lease-Versus-Purchase Decision for Tracking and Data Relay Satellite System: LCD-76-127

Space: Methodology Used in Lease-Versus-Purchase Decision for Tracking and Data Relay Satellite System: LCD-76-127
by U. S. Government Accountability Office ( (Creator)


The U.S. Government Accountability Office (GAO) is an independent agency that works for Congress. The GAO watches over Congress, and investigates how the federal government spends taxpayers dollars. The Comptroller General of the United States is the leader of the GAO, and is appointed to a 15-year term by the U.S. President. The GAO wants to support Congress, while at the same time doing right by the citizens of the United States. They audit, investigate, perform analyses, issue legal decisions and report anything that the government is doing. This is one of their reports.

Time Maintenance of User Clocks via the Tracking and Data Relay Satellite System

Time Maintenance of User Clocks via the Tracking and Data Relay Satellite System
by Gary Whitworth (Author)




© 2014 BrightSurf.com