The General Analysis And Design On The Orbit For Space Emergency Rescue Mission

If the spacecrafts in orbit can be rescued in time, heavy loss may be avoided. In this thesis, the launch window, the orbit control strategy etc. are discussed in detail for the mission of space emergency rescue. The main content is presented as follows:Firstly, the significance of space emergency rescue is analyzed, and the key technologies, such as high maneuver, fast rendezvous and autonomous rendezvous are discussed. The mission of space rescue is divided into several phases, and the tasks and characteristics of each phase are analyzed. Then the dynamics models for autonomous rendezvous are summarized.Secondly, the launch window of urgent launch mission is deduced, and the strategy to array the maneuverable launch vehicle is researched. The problem on the launch window is divided into two parts, the plane window problem and the phase window problem. Analytical models of the two problems are established, and the results are deduced in explicit form. Using the analytical results, the strategy to array the maneuver launch vehicle is given.Thirdly, the strategy of guidance and control for the phases of far range rendezvous and close range rendezvous are researched. In the phase of far range rendezvous, the modified C-W algorithms and modified Lambert algorithms are given and put into calculation, and the results are analyzed and evaluated. In addition, two impulses control strategy is used in the phase of closing, whereas the Line-of-sight guidance algorithm is used in the phase of final approach, these strategies are simulated and analyzed.Lastly, software for mission design and orbital analysis is developed. The software is designed by the Unified Modeling Language (UML), and is coded in VC++ 6.0. It has the functions such as space emergency rescue mission planning, orbital simulation and visual demonstration.This thesis is to demonstrate and analyze the feasibility for space emergency rescue mission. The research indicates that the mission is feasible in technology, but is different from common rendezvous missions. There are still many problems to be studied for a practical space emergency rescue mission.