Li-bin Zhang

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This paper describes a detailed design method and performance of the digital autopilot for attitude control of the advanced upper stage. The reaction control system (RCS) of the attitude control system (ACS) is used for attitude control, reignition operations and large angle attitude maneuvers. The RCS control laws employ parabolic switch curves in their(More)
Based on the threshold-arithmetic algebraic system which has been proposed for current-mode circuit design, we propose a systematic methodology for emitter-couple logic (ECL) circuit design. Compared to the traditional methodologies and the theory of differential current switches, the proposed methodology uses the HE map and the characteristics of the(More)
A practical problem on spacecraft inertial navigation system (INS) is described in the paper. Inertial Navigation System using in an elliptical orbit spacecraft causes a huge error when the spacecraft close to the perigee, The Causes for this error are discussed and the scale of it is estimated by simulation. Methods of eliminating the error are studied:(More)
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