Ground system design Col John Keesee 6/17/2004 Lesson objective The student will Be able to list the functions performed by a space systems ground support system 2. Know factors in ground station design 3. Know components of ground station architecture 4. Know capabilities of typical dedicated ground systems and common multi-user ground support systems 5. Know design considerations for specifying ground system elements
Ground System Design Col John Keesee 6/17/2004 1 Lesson Objectives The student will: 1. Be able to list the functions performed by a space systems ground support system. 2. Know factors in ground station design 3. Know components of ground station architecture 4. Know capabilities of typical dedicated ground systems and common multi-user ground support systems 5. Know design considerations for specifying ground system elements. 1
Oⅴ erview Ground Systems Support the space segment · Command and control Monitor spacecraft health Calculate spacecraft attitude Relay mission data to the users syste e ai d (uplink) func mission data)function
Overview • Ground Systems – Support the space segment • Command and Control • Monitor spacecraft health • Track • Calculate spacecraft attitude – Relay mission data to the users 6/17/2004 2 Ground systems have a command (uplink) function as well as a data (telemetry and mission data) function. 2
Ground station Design Location location location Coverage Data-user needs Accessibility availability Link data rates G/TS EIRP Requirements for data handling Communication between ground system elements and data users 6/17/2004 These are the important facto d station design. The spacecraft orbit and mission characteristics will drive available locations for ground systems Satellite transmitter characteristics and data rates will determine the ground stems transmitter and receiver operating characteristics Because the facilities that process data may not be co-located with the receiving system, the ground system will have its own terrestrial and space communication
Ground Station Design • Location, location, location – Coverage – Data-user needs – Cost – Accessibility – Availability • Link data rates – G/Ts, EIRP • Requirements for data handling • Communication between ground system elements and data users 6/17/2004 3 These are the important factors in ground station design. The spacecraft orbit and mission characteristics will drive available locations for ground systems. Satellite transmitter characteristics and data rates will determine the ground system’s transmitter and receiver operating characteristics. Because the facilities that process data may not be co-located with the receiving system, the ground system will have its own terrestrial and space communication links. 3
Ground system elements Mission elements and facility elements Ground station is where the earth-based end of satellite co on takes pla RF equ Transmit RF equipment Data-user interface TT&c equipment Station control center System clock The d system consists of both mission(functional)elements and facilities a ground station would usually consist of most of these elements
Ground System Elements • Mission elements and facility elements • Ground station is where the Earth-based end of satellite communication takes place – Antenna system – Receive RF equipment – Transmit RF equipment – Mission data recovery – Data-user interface – TT&C equipment – Station control center – System clock 6/17/2004 4 The ground system consists of both mission (functional) elements and facilities. A ground station would usually consist of most of these elements 4
Control centers Spacecraft Operations Control Centers Monitors and commands the spacecraft bus Analyzes spacecraft telemetry Coordinates and controls payload Control Center access Includes data monitoring equipment, commanding facilities and communications 6/17/2004 In most cases, the spacecraft operations control center controls the overall mission, even though the payload is the reason for the mission. The SOCC monitors the health and status of the bus and, in some architectures, the payload as well Sometimes it's a multi-mission facility, and many times is separated physically from the payload operations control center
Control Centers • Spacecraft Operations Control Centers – Monitors and commands the spacecraft bus – Analyzes spacecraft telemetry – Coordinates and controls Payload Control Center access – Includes data monitoring equipment, commanding facilities and communications 6/17/2004 5 In most cases, the spacecraft operations control center controls the overall mission, even though the payload is the reason for the mission. The SOCC monitors the health and status of the bus and, in some architectures, the payload as well. Sometimes it’s a multi-mission facility, and many times is separated physically from the payload operations control center. 5