Outline Purpose of thermal control systems Review of heat transfer fundamentals Space system thermal analysis equations Models Analysis programs Thermal control sub-systems

Ground system design Col John Keesee 6/17/2004 Lesson objective The student will Be able to list the functions performed by a space systems ground support system 2. Know factors in ground station design 3. Know components of ground station

Background An icbm with a range of 6500 miles has a stagnation temperature of 12,000%F, 2000 f 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 But it would vaporize during reentry

Satellite communications Architecture Identify Requirements Specify architectures Determine link data rates Design Size each link Document your rationale

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 Spacecraft data processing requires microcomputers and interfaces that are functionally similar to desktop systems However, space systems require: - Low power, volume, and mass High reliability and fault tolerance

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

Background OF TECHN Why is Software Engineering Hard? “Curse of flexibility \And they looked upon the software and saw that it was good. But they just had to add one other feature ... No physical constraints

Why Cost Estimation? Critically important part of system design Too high- lose the contract award Too low-over-run cost plus contracts, company loss on fixed price contracts Trends Design to cost Cost as an independent variable

Optimization of Separated Spacecraft Interferometer Trajectories in the Absence of A Gravity-Well Edmund M Kong Prof david w, miller MIT Space Systems Laboratory 20th March 1998 Space Systems Laboratory Massachusetts Institute of Technology