TDRSS Network: Tracking and Data Relay Satellite System

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National aeronautics and Space Administration, Goddard Space Flight Center, 1983 - Astronautics - 16 pages
 

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Page 8 - Network tracking determined the precise location of orbiting user spacecraft by measuring range (distance) and range rate (velocity) with respect to the known position of the TDRS. Ground-based stations determined the TDRS position. The user spacecraft transmitted telemetry signals indicating certain operational parameters, such as power level and temperature. It...
Page 11 - ... spacecraft (one on S-band and one on Ku-band) if both users were within the antenna's bandwidth. For multiple-access service, the multi-element S-band phased array of helical radiators was mounted on the satellite body. The multipleaccess forward link (between the TDRS and the user spacecraft) transmitted command data to the user spacecraft. In the return link, the signal outputs from the array elements were sent separately to the White Sands Ground Terminal parallel processors. A fourth antenna,...
Page 9 - Table 4-39. Single-Access Link Summary Band Forward Link (White Sands Ground Terminal to User Spacecraft) Data Rate Return Link (User Spacecraft to White Sands Ground Terminal) Data Rate 0.1 to 300 kilobits per second 1 kilobit per second to 25 megabits per second 6 megabits per second maximum 300 megabits per second maximum Used for: 1 . Commanding user spacecraft 2. Transmitting PN code for range and range rate Used for: 1 . Receiving spacecraft telemetry 2. Receiving PN code turnaround for range...
Page 11 - ... multiple-access service, the multi-element S-band phased array of helical radiators was mounted on the satellite body. The multipleaccess forward link (between the TDRS and the user spacecraft) transmitted command data to the user spacecraft. In the return link, the signal outputs from the array elements were sent separately to the White Sands Ground Terminal parallel processors. A fourth antenna, a two-meter parabolic reflector, provided the prime link for relaying transmissions to and from...
Page 11 - ... forward link (between the TDRS and the user spacecraft) transmitted command data to the user spacecraft. In the return link, the signal outputs from the array elements were sent separately to the White Sands Ground Terminal parallel processors. A fourth antenna, a two-meter parabolic reflector, provided the prime link for relaying transmissions to and from the ground terminal at Kuband. The antenna was used to control the TDRS while it was in transfer orbit to geosynchronous altitude. Table 4-41...
Page 8 - It also transmits data signals that correspond to the scientific or applications information collected by the spacecraft instruments. The...

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