The S-Band Telemetry, Tracking and Command Experiment

Abstract

The ATS-F S-band Telemetry, Tracking and Command Experiment is designed to develop and demonstrate critical aspects of the technology necessary to an operational tracking and data relay satellite (TDRS) system within the framework of NASA's existing applications flight programs. The experiment involves the implementation and operation of a two-way radio link between a synchronous satellite (ATS-F) and a near-earth orbiting satellite (Nimbus E). The link will be used for precision range and range-rate tracking of Nimbus E from ATS-F, relay of Nimbus E telemetry to the ground via ATS-F, and command of Nimbus E from the ground through ATS-F. The basic purpose of the experiment is to gain experience in the implementation and operation of real time telemetry, tracking, and command links using a synchronous satellite relay. A specific major program goal is to establish the extent to which it is possible to determine the orbit of a near earth orbiting spacecraft using tracking data obtained from a synchronous satellite. It is anticipated that the experiment will be of great value in defining the theoretic and practical problems associated with the design, implementation, and operation of a future TDRS system.