The Microwave Anisotropy Probe (MAP) is a follow-on to the Differential Microwave Radiometer (DMR) instrument on the Cosmic Background Explorer (COBE) spacecraft. The design and analysis of the MAP attitude control system (ACS) have been refined since work previously reported. The full spacecraft and instrument flexible model was developed in NASTRAN, and the resulting flexible modes were plotted and reduced with the Modal Significance Analysis Package (MSAP). The reduced-order model was used to perform the linear stability analysis for each control mode, the results of which are presented in this paper. Although MAP is going to a relatively disturbance-free Lissajous orbit around the Earth-Sun L2 Lagrange point, a detailed disturbance-torque analysis is required because there are only a small number of opportunities for momentum unloading each year. Environmental torques, including solar pressure at L2, and aerodynamic and gravity gradient during phasing-loop orbits, were calculated and simulated. A simple model of fuel slosh was derived to model its effect on the motion of the spacecraft. In addition, a thruster mode linear impulse controller was developed to meet the accuracy requirements of the phasing loop burns. A dynamic attitude error limiter was added to improve the performance of the ACS during large attitude slews. The result of this analysis is a stable ACS subsystem that meets all of the mission's requirements.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Closed Loop Software Control of the MIDEX Power System


    Beteiligte:

    Kongress:

    Aerospace Conference ; 1998 ; Aspen, CO, United States


    Erscheinungsdatum :

    01.01.1998


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Closed Loop Software Control of the MIDEX Power System

    Castell, K. / Hernandez-Pellerano, A. / Wismer, M. et al. | British Library Conference Proceedings | 1998


    Closed Loop Software Control of the MIDEX Power System

    K. Castell / A. Hernandez-Pellerano / M. Wismer | NTIS | 1998


    The Swift GRB MIDEX mission

    Hurley, Kevin | Online Contents | 2004


    The Swift GRB MIDEX Mission

    Hurley, K. / Swift MIDEX team / International Council of Scientific Unions | British Library Conference Proceedings | 2004


    Astrophysics MIDEX Missions in the US

    Nousek, J. A. / The Committee on Space Research | British Library Conference Proceedings | 2002