Space Segment Operations — Lesson 2

This lesson covers the intricate operations of the space segment, focusing on the reaction wheel, thrusters, and telemetry tracking and command (TTC) system. It explains how the reaction wheel is used to generate stiffness and adjust the disturbing torque in a satellite. The lesson also discusses the role of thrusters in generating force and torque. It further delves into the telemetry tracking and command system, explaining how it monitors the health and status of the satellite and supports the detection of orbital parameters. The lesson also touches on the importance of synchronization words in telemetry and telecommand frames.

Video Highlights

00:18 - Reaction wheel and thrusters
04:55 - Adjustment of the orbit's certain structure and the concept of gyroscopic stiffness
06:55 - Spin stabilized satellite
08:29 - tracking, Telemetry and command (TTC) subsystem
13:46 - Synchronization word selection in telemetry and telecommand frames
17:06 - Synch word detection

Key Takeaways

- The reaction wheel in a satellite is used to generate stiffness and adjust the disturbing torque.
- Thrusters generate force and torque, and are used when more torque is required than the reaction wheel can provide.
- The telemetry tracking and command system monitors the health and status of the satellite, supports the detection of orbital parameters, and executes commands.
- Synchronization words in telemetry and telecommand frames are crucial for identifying the beginning of the frame and ensuring accurate data detection.
- The telemetry and telecommand frequencies are usually in the S band, and are used during orbit placement and emergencies.