| Popis: |
The optimal stochastic orbit transfer strategy is defined as the sequence of guidance corrections which will minimize a statistical measure of final error, subject to the constraint that the total correction capability expended be less than a specified number. The dynamic programming algorithm is employed to solve this problem. It is assumed that the state of the system at any time can be described by the correction capability remaining and the maximum likelihood estimates of the orbit parameters. The numerical difficulty of storing the many values of the optimized performance index corresponding to every discrete value of the state variables is overcome by representing the performance surface only in the neighborhood of local minima and by introducing the effect of the correction capability state variable constraint in a simplified way. |
