In a method of controlling a spacecraft (2) having a state x(t) by means of a control u(t), t being the time, during an atmospheric entry, a cost function depending on x(t), u(t) and t is defined in drag-energy dynamics. State constraints to the state x(t) and control constraints to the control u(t) are defined as drag-energy constraints, the state constraints including a starting state and terminal constraints. Determining a minimum of the cost function is transferred into a convex problem by introducing a set of variables corresponding to a reciprocal of drag acceleration. Then, the minimum of the cost function is determined as a drag-energy profile considering the state and constraints. The drag-energy profile is transformed into longitudinal states of the spacecraft (2). Then, that control(t) is applied to the spacecraft (2) that adjusts the longitudinal states of the spacecraft (2) which result in the determined minimum of the cost function.


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    Title :

    METHOD, APPARATUS AND SPACECRAFT FOR CONSTRAINED ATMOSPHERIC ENTRY


    Additional title:

    VERFAHREN, VORRICHTUNG UND RAUMFAHRZEUG FÜR EINGESCHRÄNKTEN ATMOSPHÄRISCHEN EINTRITT
    PROCÉDÉ, APPAREIL ET ENGIN SPATIAL POUR ENTRÉE ATMOSPHÉRIQUE CONTRAINTE


    Contributors:

    Publication date :

    2019-07-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G05D SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES , Systeme zum Steuern oder Regeln nichtelektrischer veränderlicher Größen / B64G Raumfahrt , COSMONAUTICS




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