Systems Considerations (Valving, tanks, etc) Characteristics of some monopropellants (Reprinted from H. Koelle, Handbook of Astronautical Engineering, McGraw-Hill, 1961.) Flame Chemical Density temp

麻省理工学院：《Satellite Engineering》Lecture 4 propulsion

OUTLINE Overview of effects Solar Cycle Gravity Neutral Atmosphere Ionosphere GeoMagnetic Field Plasma Radiation

Space Systems Laboratory Massachusetts Institute of Technology Objective and Outline Objective and Outline Objective : To determine the optimal trajectories to re￾orient a cluster of spacecraft Motivation : To maximize the full potential of a cluster of spacecraft with minimal resources

— In order to point and slew optical systems, spacecraft attitude control provides coarse pointing while optics control provides fine pointing

Deployment and Geometry Maintenance Deployment and Geometry Maintenance  Deployable Membranes Used for solar arrays, sunshields, decoys Being researched for apertures starting at RF and eventually going to optical

Autonomy Technologies Fault Detection, Isolation and Recovery Planning & Scheduling Intelligent Data Understanding

The telemetry, tracking and control subsystem provides vital communication to and from the spacecraft TT&C is the only way to observe and to control the spacecraft’s functions and condition from the ground October 29, 2003 Massachusetts Institute of Technology

Overview Ground Systems Support the space segment Command and Control Monitor spacecraft health Track Calculate spacecraft attitude

An ICBM with a range of 6500 miles has a stagnation temperature of 12,000 ºF, 2000 ºF hotter than the surface of the sun Calculations showed that the optimum design for structural strength, resistance to heating, and free flight stability was a long, needle nosed reentry body