Notetaker: Control Subsystems

Question 1

Identify

Manages and regulates a process output based on inputs into the process

Answer 1

Control Systems

Question 2

What are the steps of Open-Loop Controls?

Answer 2

1. Input
2. Controller
3. Actuator
4. Output

Question 3

What are the steps of Closed-Loop Controls?

Answer 3

1. Input
2. Controller
3. Actuator
4. Output
5. Feedback

Question 4

Identify

Responsible for satellite attitude (“rotational”) control; where the satellite is pointing or focused

Answer 4

Attitude Determination and Control Subsystem (ADCS)

Question 5

Identify

Responsible for satellite orbit control; where the satellite is heading or what path it is on

Answer 5

Guidance, Navigation, and Control Subsystem (GNC)

Question 6

What controls and monitors the rotation of the satellite?

Answer 6

Attitude Determination and Control System (ADCS)

Question 7

What ensures antennas pointed at ground station, payload pointed in the right direction, and component temperatures maintained by point spacecraft face toward/away from the sun?

Answer 7

Attitude Determination and Control System (ADCS)

Question 8

What are the components of the Attitude Determination and Control System (ADCS)?

Answer 8

• Controller
• Instruments
• Sensors

Question 9

Attitude determination must be performed where?

Answer 9

On-Board

Question 10

Identify

How we determine attitude

Answer 10

Attitude Sensors

Question 11

What are the “eyes” of ADCS?

Answer 11

• Earth Sensors
• Sun Sensors
• Star Sensors

Question 12

What is the “Inner Ear” of ADCS?

Answer 12

• Gyroscopes
• Magnetometers

Question 13

What is the other sensor of ADCS?

Answer 13

• Global Navigation Satellite System (GNSS) Receiver

Question 14

What are the “brains” of ADCS?

Answer 14

Attitude Controllers

Question 15

Identify

Takes inputs from the sensors and generates commands

ADCS

Answer 15

Attitude Controllers

Question 16

Identify

The “hands” of the system

ADCS

Answer 16

Attitude Instruments

Question 17

Identify

Takes commands from the controller and provides “torque on demand” to control satellite attitude

ADCS

Answer 17

Attitude Instruments

Question 18

How do Passive Instruments “inner ear” work?

ADCS

Answer 18

Uses natural phenomenas (gravity, angular momentum, etc)

Question 19

How do Active Instruments “hands” work?

ADCS

Answer 19

Turned on and off by controller (requires power to operate)

Question 20

What are 3 Passive Instruments?

ADCS

Answer 20

• Gravity-Gradient Stabilization
• Spin Stabilization
• Dampers

Question 21

What are 3 Active Instruments?

ADCS

Answer 21

• Thrusters
• Magnetic Torquers
• Momentum-Control Devices

Question 22

What controls and monitors the orbit of the satellite?

Answer 22

Guidance, Navigation, and Control Subsystem (GNC)

Question 23

What is the position and velocity with respect to the earth?

Answer 23

Orbit

Question 24

What is known as “the actuators?”

GNC

Answer 24

Guidance

Question 25

What is known as "the sensors?" ## Footnote GNC

Answer 25

Navigation

Question 26

What is known as the "brain of the system?" ## Footnote GNC

Answer 26

Control

Question 27

# Identify Utilizes the Propulsion Subsystem ## Footnote GNC

Answer 27

Guidance

Question 28

# Identify Generates thrust in a specific direction ## Footnote GNC

Answer 28

Guidance

Question 29

# Identify Two primary concerns: * Velocity Vector (V) * Position Vector (R) ## Footnote GNC

Answer 29

Navigation

Question 30

# Identify Two navigation systems: * On-Board * Off-Board ## Footnote GNC

Answer 30

Navigation

Question 31

# Identify Compares current position and velocity (Vcurrent) to desired position and velocity (Vdesired) ## Footnote GNC

Answer 31

Control

Question 32

# Identify Sends commands to the actuators ## Footnote GNC

Answer 32

Control

Question 33

Processed INTERNALLY is called? ## Footnote GNC

Answer 33

On-Board

Question 34

Processed EXTERNALLY is called? ## Footnote GNC

Answer 34

Off-Board

Question 35

# Identify Measures the range between GPS and the receiver ## Footnote GNC

Answer 35

GNSS Receiver

Question 36

# Identify Performs triangulation ## Footnote GNC

Answer 36

Earth, Sun, and/or Star Sensors

Question 37

# Identify Utilizing Newton's Laws to determine the current position and velocity (uses accelerometers and gyroscopes) ## Footnote GNC

Answer 37

Inertial Sensors

Question 38

# Identify When a spacecraft passes over an RTS, the RTS can provide ranging ## Footnote GNC

Answer 38

RTS Ranging

Question 39

# Identify Supplemented by SSN observations ## Footnote GNC

Answer 39

Space Surveillance Network (SSN)

Question 40

# Identify Extension of the SDA mission ## Footnote GNC

Answer 40

Space Domain Awareness (SDA)