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

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

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

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

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

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

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

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

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

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

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