1. Spacecraft Subsystem
Introduction to Space Systems and Spacecraft Design
Space Systems Design

2. What are they? Spacecraft Subsystems Structure ADCS EPS Comm C&DH
Payload
Thermal
Propulsion 2
Introduction to Space Systems and Spacecraft Design
Space Systems Design

3. What are they? Spacecraft Subsystems 3
Introduction to Space Systems and Spacecraft Design
Space Systems Design

4. What are they? Spacecraft Subsystems 4
Introduction to Space Systems and Spacecraft Design
Space Systems Design

5. These parameters typically drive the design of a baseline system.
Spacecraft Subsystems
Principal Requirements and Constraints for Spacecraft Design.
These parameters typically drive the design of a baseline system. 5
Introduction to Space Systems and Spacecraft Design
Space Systems Design

6. Principal Requirements and Constraints for Spacecraft Design
Spacecraft Subsystems
Principal Requirements and Constraints for Spacecraft Design 6
Introduction to Space Systems and Spacecraft Design
Space Systems Design

7. Principal Requirements and Constraints for Spacecraft Design
Spacecraft Subsystems
Principal Requirements and Constraints for Spacecraft Design 7
Introduction to Space Systems and Spacecraft Design
Space Systems Design

8. Initial Spacecraft Design Decisions or Trade-Offs - I
Spacecraft Subsystems
Initial Spacecraft Design Decisions or Trade-Offs - I
Principal Options or Key Issues
Design Approach
Or Aspect
Spacecraft weight Must allow for spacecraft bus weight and payload weight
Spacecraft power Must meet power requirements of payload and bus
Spacecraft size Is there an item such as a payload antenna or optical system
that dominates the spacecraft’s physical size? Can the
spacecraft be folded to fit with the booster diameter?
Spacecraft size can be estimated from weight and power
requirements.
Attitude control Options include no control, spin stabilized, or three axis control:
approach selection of sensors and control torquers. Key issues are number
of items to be controlled, accuracy, and amount of scanning or
slewing required. 8
Introduction to Space Systems and Spacecraft Design
Space Systems Design

9. Initial Spacecraft Design Decisions or Trade-Offs -II
Spacecraft Subsystems
Initial Spacecraft Design Decisions or Trade-Offs -II
Design Approach
Or Aspect
Principal Options or Key Issues
Solar Array Options include planar, cylindrical, and omnidirectional arrays
approach either body mounted or offset.
Propulsion Is metered propulsion required? Options include no propulsion,
approach compressed gas, liquid monopropellant or bipropellant. 9
Introduction to Space Systems and Spacecraft Design
Space Systems Design

10. Spacecraft Subsystems
Subsystems, we will look at those in greater detail in the future lectures. 10
Introduction to Space Systems and Spacecraft Design
Space Systems Design

11. What about spacecraft payloads?
Spacecraft Subsystems
What about spacecraft payloads? 11
Introduction to Space Systems and Spacecraft Design
Space Systems Design