  To overcome the limitations of current parafoil precision landing
capabilities, an efficient real-time convex optimized guidance and control
strategy is presented. Successive convexification of the parafoil guidance
problem guarantees local optimality with polynomial convergence rate for
efficient real-time implementation, where each iteration is dynamically
feasible. Our approach shows reliable and fast numerical convergence through
in-flight recalculation of time of flight and a new optimal trajectory to cope
with time-varying dynamics. The efficiency of our strategy is demonstrated via
a comparative analysis of the existing X-38 in-flight demonstrated guidance and
control system. Exhaustive Monte-Carlo simulations show performance
improvements of about one order of magnitude. The concept proposed is simple,
yet general, as it scales to any atmospheric parafoil landing system and allows
efficient implementation relying only on the turn rate information.
