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Orbit at the critical inclination is a practical option for long-term satellite formations flying around an oblate Earth. This paper establishes that passive and periodic relative orbits with cross-track motion are only possible at the critical inclination under conditions that all satellites share the same inclination, the same semi-major axis and the same eccentricity. Furthermore, a quasi-periodic...
Formation design considering the eccentricity and the J2 perturbation is significant for a practical satellite formation flying mission. The linear solution of satellite relative motion proves that, by setting all satellites having the same mean orbit elements of semi-major axis, eccentricity, inclination and right ascension of ascending node, a passive in-plane formation is periodic and stable in...
In this work we present a new health monitoring method for hybrid systems. The method utilizes the concept of unified constraint relations, named the global analytical redundancy relations (GARRs). Using GARRs for health monitoring of hybrid system requires the system's current mode and this information is provided by a mode tracker. To make the mode tracking more efficient, a unique mode-change isolation...
Hysteresis characteristics is highly nonlinear, has memory and is common in engineering systems. Its presence introduces uncertainties and nonlinearity in dynamic modelling and thus difficulties in achieving a good control design. This paper studies the suitability of iterative learning control (ILC) to compensate hysteresis uncertainties for a class of continuous-time dynamic systems. We examine...
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