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THREEDIMENSIONAL MASS CENTER ESTIMATOR FOR
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accelerometers air bearing amplitude analog computer analog simulation angle angular momentum angular velocity assume assumption attitude behavior attitude control attitude estimator B-TYPE becomes bias boundary of stability characteristic equation coefficient matrix component considered constant control law coupling damping ratio derivatives drag-free satellite DS type error equation esti estimated value external feedback gains given in Fig gyro initial conditions laboratory linear estimator machine units mass center estimator mator mechanization misalignments modes moments of inertia motion nutation observable offline estimation optimal estimator orbital plane oscillation paragraph pickoff null plates pole location principal axes problem proof mass rad/sec roll-yaw plane root locus rotating axis rotating satellite scale in machine SCHEMATIC DESIGN sensor null spin axis spin rate SPINNING VEHICLE SIMULATOR steady telemetry third channel THREE DIMENSIONAL ESTIMATION three-dimensional THRUSTOR tion torques translation control two-dimensional estimator vector zero