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Homotopic approach can greatly reduce the difficulty of solving optimal control problems. Although the technology of solving fuel-optimal problem by starting from the related energy-optimal one is widely used in constant-specific-impulse low-thrust trajectory optimization, it is no longer applicable for variable-specific-impulse problems. For the variable-specific-impulse low-thrust trajectory optimization,...
In this paper, a fusion CKF algorithm with TDRS (Tracking and Data Relay Satellite) and ground stations is presented for a micro reentering USV (Unmanned Space Vehicle). A micro reentering USV has high lift-drag ratio and maneuverability, unlike traditional reentry vehicle, is hard to track. In order to solve this problem, a fusion strategy of CKF (Cubature Kalman Filter) with multi-sensors is estimated...
In view of the landing site positioning of the lunar probe, this paper proposes a positioning reduction method based on VLBI tracking data, and applies VLBI delay-observation data from more than three baselines to complete positioning reduction with the distance between the lunar lander and the center of the earth as a constraint. Simulation results show that the positioning accuracy of landing point...
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