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SPS 101 - Space Systems > Notetaker: Control Subsystems > Flashcards

Notetaker: Control Subsystems Flashcards

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1
Q

Identify

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

A

Control Systems

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2
Q

What are the steps of Open-Loop Controls?

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

What are the steps of Closed-Loop Controls?

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

Identify

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

A

Attitude Determination and Control Subsystem (ADCS)

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5
Q

Identify

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

A

Guidance, Navigation, and Control Subsystem (GNC)

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6
Q

What controls and monitors the rotation of the satellite?

A

Attitude Determination and Control System (ADCS)

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7
Q

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?

A

Attitude Determination and Control System (ADCS)

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8
Q

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

A
  • Controller
  • Instruments
  • Sensors
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9
Q

Attitude determination must be performed where?

A

On-Board

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10
Q

Identify

How we determine attitude

A

Attitude Sensors

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11
Q

What are the “eyes” of ADCS?

A
  • Earth Sensors
  • Sun Sensors
  • Star Sensors
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12
Q

What is the “Inner Ear” of ADCS?

A
  • Gyroscopes
  • Magnetometers
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13
Q

What is the other sensor of ADCS?

A
  • Global Navigation Satellite System (GNSS) Receiver
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14
Q

What are the “brains” of ADCS?

A

Attitude Controllers

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15
Q

Identify

Takes inputs from the sensors and generates commands

ADCS

A

Attitude Controllers

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16
Q

Identify

The “hands” of the system

ADCS

A

Attitude Instruments

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17
Q

Identify

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

ADCS

A

Attitude Instruments

18
Q

How do Passive Instruments “inner ear” work?

ADCS

A

Uses natural phenomenas (gravity, angular momentum, etc)

19
Q

How do Active Instruments “hands” work?

ADCS

A

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

20
Q

What are 3 Passive Instruments?

ADCS

A
  • Gravity-Gradient Stabilization
  • Spin Stabilization
  • Dampers
21
Q

What are 3 Active Instruments?

ADCS

A
  • Thrusters
  • Magnetic Torquers
  • Momentum-Control Devices
22
Q

What controls and monitors the orbit of the satellite?

A

Guidance, Navigation, and Control Subsystem (GNC)

23
Q

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

A

Orbit

24
Q

What is known as “the actuators?”

GNC

A

Guidance

25
Q

What is known as “the sensors?”

GNC

A

Navigation

26
Q

What is known as the “brain of the system?”

GNC

A

Control

27
Q

Identify

Utilizes the Propulsion Subsystem

GNC

A

Guidance

28
Q

Identify

Generates thrust in a specific direction

GNC

A

Guidance

29
Q

Identify

Two primary concerns:
* Velocity Vector (V)
* Position Vector (R)

GNC

A

Navigation

30
Q

Identify

Two navigation systems:
* On-Board
* Off-Board

GNC

A

Navigation

31
Q

Identify

Compares current position and velocity (Vcurrent) to desired position and velocity (Vdesired)

GNC

A

Control

32
Q

Identify

Sends commands to the actuators

GNC

A

Control

33
Q

Processed INTERNALLY is called?

GNC

A

On-Board

34
Q

Processed EXTERNALLY is called?

GNC

A

Off-Board

35
Q

Identify

Measures the range between GPS and the receiver

GNC

A

GNSS Receiver

36
Q

Identify

Performs triangulation

GNC

A

Earth, Sun, and/or Star Sensors

37
Q

Identify

Utilizing Newton’s Laws to determine the current position and velocity (uses accelerometers and gyroscopes)

GNC

A

Inertial Sensors

38
Q

Identify

When a spacecraft passes over an RTS, the RTS can provide ranging

GNC

A

RTS Ranging

39
Q

Identify

Supplemented by SSN observations

GNC

A

Space Surveillance Network (SSN)

40
Q

Identify

Extension of the SDA mission

GNC

A

Space Domain Awareness (SDA)

SPS 101 - Space Systems (12 decks)

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