TDRSS


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TDRSS

Abbrev. for tracking and data-relay satellite system. A network of four NASA satellites that transmits commands from a ground station to NASA spacecraft – including the HST – and returns their scientific data to the ground.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

TDRSS

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In this paper, the research content focuses on the dynamic relay satellite scheduling in the TDRSS system.
Load all of the known opportunities (AFSCN visibilities, TDRSS visibilities, and procedures that have already been preplanned by hand or from previous runs of ASPEN).
TDRSS support was originally also scheduled in the long-range planning time frame for all scenarios; however, cost constraints and changes to the plan in the short term dictated the need for a policy change.
The research could help NASA create a stable TDRSS transceiver link on sounding rockets.
(1) A sounding rocket could expose an LO to as much as 30 g of acceleration, potentially causing loss of communications to the TDRSS and, therefore, loss of valuable information.
"Using the TDRSS should not be a problem at first, but we'll have to see how things shape up later [when observations become more frequent]," Doxsey says.
The modernisation is expected to improve situational awareness for TDRSS network operators; reduce operations and sustainment costs; upgrade computing and signal processing equipment; enhance reliability and maintainability; and improve efficiency.
Harris said that it will lead the effort to replace all equipment and software in the space-to-ground link of NASA's TDRSS. The space-to-ground link will feature advanced Harris technologies including high-speed modems and switches, signal processing, and RF systems.
Two TDRSs in synchronous earth orbit provide forward and return links between LEO satellites and the earth station, increasing the direct contact time to 85 percent.
Further expansion on these services will be provided by RCA in support of the operation of NASA's Tracking and Data Relay Satellite System (TDRSS) in 1982.
The South Pole TDRSS Relay II Project (SPTR II) upgrade will use RT Logic supplied Telemetrix 1200HDR (T1200HDR high data rate modem, Telemetrix 400XR modem and the Telemetrix 500HR high rate front processor, which will be combined to enable the relay of science data to the White Sands Complex at data transfer rates of up to 300Mb/s.
NASA Polar Platform Parameters(13) Orbit 824 km polar sun-synchronous 1:30 pm equator crossing time, ascending node Launch date October 1995 Launch vehicle Titan IV Platform size 7.5 m (l) X 4 m (w) Platform mass 3500 kg Power 3.5 kW average to payload Data relay via TDRSS 300 Mbps (max.) On-board data storage