4. Atmospheric phase
Calculating a reentry trajectory requires numerical methods of optimization (to find the control law α, μ) and integration (to propagate the differential equations of motion). These cumbersome methods do not provide a physical understanding of the phenomena. When designing a vehicle or preparing a mission, simple analytical models are needed to quickly assess performance and define the re-entry scenario.
4.1 Simplified equations
The following assumptions simplify the equations of motion (21) :
the Earth is spherical,...
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Atmospheric phase
Conclusion
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