The Interplanetary Program to Optimize Space Trajectories (IPOST) is intended to support many analysis phases, from early interplanetary feasibility studies through spacecraft development and operations. The IPOST output provides information for sizing and understanding mission impacts related to propulsion, guidance, communications, sensor/actuators, payload, and other dynamic and geometric environments. IPOST models three degree of freedom trajectory events, such as launch/ascent, orbital coast, propulsive maneuvering (impulsive and finite burn), gravity assist, and atmospheric entry. Trajectory propagation is performed using a choice of Cowell, Encke, Multiconic, Onestep, or Conic methods. The user identifies a desired sequence of trajectory events, and selects which parameters are independent (controls) and dependent (targets), as well as other constraints and the cost function. Targeting and optimization is performed using the Stanford NPSOL algorithm. IPOST structure allows subproblems within a master optimization problem to aid in the general constrained parameter optimization solution. An alternate optimization method uses implicit simulation and collocation techniques.


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    Title :

    Interplanetary Program to Optimize Simulated Trajectories (IPOST). Volume 2: Analytic Manual (Revised)


    Contributors:
    P. E. Hong (author) / P. D. Kent (author) / D. W. Olson (author) / C. A. Vallado (author)

    Publication date :

    1992


    Size :

    73 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English







    Interplanetary Program to Optimize Simulated Trajectories (IPOST). Volume 1: User's guide

    Hong, P. E. / Kent, P. D. / Olson, D. W. et al. | NTRS | 1992


    Interplanetary program to optimize simulated trajectories (IPOST). Volume 4: Sample cases

    Hong, P. E. / Kent, P. D / Olson, D. W. et al. | NTRS | 1992