Environmental torques imparted on the NISAR (NASA-ISRO (NASA Jet PropulsionLaboratory (JPL)-Indian Space Research Organization (ISRO) Synthetic Aperture Radar) spacecraft are modeled. The environmental torques comprise of the gravity gradient, atmospheric drag, and solar radiation pressure. These torques act as external disturbances on the spacecraft and cause momentum to accumulate. This momentum needs to be unloaded via attitude control hardware. In order to size the hardware, it is important to determine the environmental torques imparted on the spacecraft. The results indicate that the worst case gravity gradient, drag, and solar radiation pressure torques are 7.4 by 10 (sup -3) Nm (Newton meters), 6.01 by 10 (sup -3) Nm, and 14.03 by 10(sup -3) Nm, respectively.


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    Title :

    NISAR Spacecraft Environmental Torque Modeling During Operations


    Contributors:

    Conference:

    AIAA Atmospheric Flight Mechanics Conference ; 2016 ; Washington, DC, United States


    Publication date :

    2016-06-13


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :



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