Space Segment Part — Lesson 1

This lesson covers the intricate details of Satellite Communication Systems, focusing on the space segment part. It delves into the components of a satellite, including the satellite bus, payload, antenna, and the environment in which the satellite operates. The lesson also discusses the reliability requirements of these systems. It further explains the functions of the satellite bus, such as maintaining the position and orientation of the satellite, providing status and health of the subsystems to the ground monitoring station, and supporting the ground station to track its location. The lesson also explores the Attitude and Orbit Control System (AOCS), the propulsion system, and the power system of a satellite. It also covers the attitude control units and different types of sensors used in satellite.

Video Highlights

00:18 - Introduction
02:11 - Functions of the satellite bus and spacecraft bus
09:53 - Attitude and Orbit Control System (AOCS)
11:36 - Explanation of the three axes of the satellite: roll, pitch, and yaw
14:59 - Satellite's orientation
16:42 - Earth sensor
21:56 - RF, sun and star sensors
25:18 - Attitude control using reaction wheels and thrusters

Key Takeaways

- The satellite bus is a platform that supports the payload operation reliably throughout the mission life.
- The Attitude and Orbit Control System (AOCS) maintains the position and orientation of the satellite towards the service area.
- The propulsion system provides the thrust to the satellite to maintain its attitude and orbit.
- The power system provides primary and secondary DC power to the subsystems and electronics in the satellite bus and payload.
- The satellite bus also provides mechanical and structural support to the satellite during orbit raising and normal operation.