TRACKING AND DATA RELAY SATELLITE SYSTEM CONFIGURATION AND TRADEOFF STUDY Volume 4. TDRS System Operation and Control and Telecommunications Service System

摘要

The results of Phase I of the TDRSS study have been organized into three major categories: 1) operations and control, 2) telecommunication service system, and 3) spacecraft design. This volume contains the material treating topics 1 and 2, and Volume 3 discusses the design of the TDR spacecraft.nOperations and control refer to those aspects of the TDRS system that involve the major system elements such as the spacecraft, ground sta¬tion, and control facilities. The four major subjects included in this sec¬tion are 1) orbit selection, 2) launch and orbit insertion, 3) TDRS on-orbit control, and 4) telecommunications service system control.nOrbit selection, discussed in subsection 2. 1, relates the TDRS posi-tion and orbit inclination to both ground station visibility and user visibility. The impact on spacecraft mass due to orbit inclination is discussed. Sub¬section 2.2 discusses the major phases required to achieve the selected TDRS orbit, including launch, transfer orbit, apogee injection, and station acquisition.