1. INTRODUCTION........................................................... 1-1 2. SYSTEM REQUIREMENTS.................................................... 2-1 2.1 Satellite Interfaces............................................. 2-3 2.2.1 Satellite Trajectories................................ 2-3 2.1.2 Frequency Bands....................................... 2-3 2.2 Mission Support Functional Requirements......................... 2-3 2.2.1 Acquistion............................................ 2-3 2.2.2 Tracking.............................................. 2-3 2.2.3 Commanding............................................ 2-5 2.2.4. Telemetry............................................. 2-7 2.3 Data Processing................................................. 2-9 2.3.1 Computational Support................................. 2-9 2.3.2 Status and Control.................................... 2-11 2.3.3 Interstation Communications Data Processing........... 2-11 2.4 Communications.................................................. 2-11 2.4.1 Interstation Communications........................... 2-11 2.4.2 Intrastation Communications........................... 2-12 2.5 Timing.......................................................... 2-12 2.6 Checkout........................................................ 2-12 2.7 Requirements Summary............................................ 2-13 3. System Definition...................................................... 3-1 3.7 NEW DATA SYSTEM................................................ 3-29 3.7.1 Computer Complex...................................... 3-31 3.7.2 Computer Interface Equipment.......................... 3-33 3.7.3 Control and Display Equipment......................... 3-35