Page 223 - Intro to Space Sciences Spacecraft Applications

Introduction to Space Sciences and Spacecraft Applications
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B. Ground Support Components
1. Spacecraft design and construction
2. Launch sites
a. launch vehicles
b. upper stages
3. Ground Sites
C. User Components
REFERENCES/ADDITIONAL READING

Wertz, J. and Larson, W., Space Mission Analysis and Design. Boston:
Kluwer Academic Publishers, 199 1.
Griffin, M. and French, J., Space Vehicle Design. Washington, D.C.:
American Institute of Aeronautics and Astronautics, 199 1.
The Flight Projects Directorate Project Management Handbook, NASA,
Goddard Space Flight Center, 1994.

EXERCISES

1. Choose one of the common uses of systems in space (communications,
navigation, remote sensing) and complete the following:
a. Define the need for such a system and justify its performance from a
space-based solution versus a ground-based system.
b. Define the top-level characteristics (requirements) for the system.
This is a listing of what must be accomplished to meet the stated
need, but does not assign functions to any particular segment of the
system (space segment, ground segment, etc.).
c. Create a value model using these characteristics. Assign and provide
rationale for weighting factors for each characteristic.
d. For each of the space system components listed at the end of this chap-
ter, take a first cut on assignment of functions and component charac-
teristics. This will involve defining the basic mission scenario, includ-
ing launch site and vehicle, ground systems and operation, as well as
defining the types of spacecraft subsystems appropriate for the mis-
sion. Assumptions may be made for the payload (size, mass, power,
data, etc.).
e. The next step would be to perform an initial sizing of the system and
subsystems. Good luck!