Meeting the Challenge for Missions of the Future|
ATI's Mission Analysis for Solar System Exploration course
The present-day approach to selecting missions for
solar system exploration is based largely on price-performance
ratio - getting the most for the least
within an acceptable level of risk. Mission analysis
plays an enormous role in this process as mission
designs become ever more complex to qualify under
the selection criteria currently being applied. The
hugely successful Cassini mission to Saturn has set
the bar for level of complexity in mission design, but
this distinction is temporal as the Messenger mission
engages in its lengthy and circuitous path to its final
destination in orbit about Mercury, preceded with
several swingbys of Earth, Venus and Mercury and
major space burns. As the tools and methodologies
for the analysis of such missions are refined,
increasingly elaborate mission designs are to be
expected and demanded. This three-day course is
designed to prepare engineers and technical
management for the task of adequately planning and
supporting the mission analysis function to
successfully accomplish its role in a solar system
exploration project. The course also provides the
background and direction needed for those interested
in mission analysis to pursue their craft in an
organized and expeditious manner.
What You Will Learn:
- The Solar System Environment. Targets of exploration-sun, planets, natural satellites,
asteroids, comets. Ephemerides of solar system bodies. Libration points.
- Building on Success. Historical exploration missions of significance. Current missions.
The Discovery program. Impact of “smaller, cheaper, better” philosophy.
- Phases of Mission Analysis. Preliminary phase with emphasis on speed and
conceptualization. Later phase with emphasis on accuracy and detail. Implication on tools
- Fundamentals of Heliocentric Orbit Transfers. Kepler’s Problem, Lambert’s Problem
and its solution. Type I and Type II transfers. Posigrade and retrograde trajectories.
Multiple revolution trajectories. N-pi transfers.
- Multi-leg Missions. Linking trajectory legs to form missions. Correspondence between
target centered and heliocentric end conditions. Hyperbolic excess speed. The patched
conic and matched (overlaid) asymptote models. Space burn maneuvers.
- Target Encounters. The planetary swingby. Tisserand’s criterion and graphical methods. B-plane targeting. Powered swingbys. Planetary orbit capture and escape. Asteroid/comet flyby and rendezvous.
- Correlating Trajectory and Propulsion Requirements. Spacecraft mass models.
Propulsion system models. The rocket equation. Impulsive velocity calculations.
Estimating velocity losses resulting from finite burn effects. Reducing velocity losses.
- Concepts of Exploration Mission Design. Creating and using porkchop plots. Growing
importance of planetary swingbys. Swingbys always reduce propulsion requirements,
right? Uses of space burns. Single and repeated planetary swingbys. Uses of n-pi transfers,
Nodal transfers. Building multiple-target missions. Implications of human space flight on
- Trajectory and Mission Optimization. Direct versus indirect optimization methods.
Formulating the problem. Dealing with convergence difficulties. Locally optimizing
- Case Study of a High Thrust Solar System Exploration Mission Analysis.
- Low-Thrust Mission Analysis and Optimization. Differences in analysis techniques
compared to high-thrust missions. Methods of optimization. Commonly used software
tools. Problem formulation using the Calculus of Variations.
- Power System Modeling. Representing array power output as a function of solar distance.
- Propulsion System Modeling. The classic model. Programmed modeling of representative ion thrusters (e.g. NSTAR, NEXT, etc). A proposed model based on a thruster operating envelope.
- Case Study of Solar Electric Propulsion Mission Design and Optimization.
This course is not on the current schedule of open enrollment courses. If you are interested in attending this or another course as open enrollment, please contact us at (410) 956-8805 or at firstname.lastname@example.org and indicate the course name and number of students who wish to participate. ATI typically schedules open enrollment courses with a lead time of 3-5 months. Group courses can be presented at your facility at any time. For on-site pricing, request an on-site quote. You may also call us at (410) 956-8805 or email us at email@example.com.