Study Of The Maneuver Flying Guidance Techniques For Small Satellite Autonomous Proximity Operations

Autonomous proximity operations have important civil and military value. And autonomous guidance technology is one of the emphasis contents in this area. Much attention is paid to the research of the guidance models guidance methods and guidance algorithms in the autonomous proximity operations in this paper, the main contents are:1 The concept of the small satellites autonomous proximity operations and its requirement background are given first in this thesis, then the development of the flying dynamics navigation and guidance control technology in this field are analyzed. Above this, the tasks and characteristics of the small satellite autonomous proximity operation flying are summarized.2 Based upon analyzing the relative motion dynamics model of the closing spacecrafts, the relative motion model using relative orbit elements is presented. Facing the proximity operation flying tasks, the conditions of typical phases are defined and the two-pulse model is deduced based on the closed-form solution of the linear C-W equations.3 The guidance methods for different proximity maneuver flying are researched, emphasis on the proximity flying guidance problem, an optimized multi-pulse glidescope guidance algorithms when considering the required time in the mission is investigated deeply. The conceptions of the quick exponential and slow glidescopes are defined, and the three types of glidescope design approach and algorithm are given. The designed approaches can meet the needs of decreasing in the proximity operation and accelerating in the retreat operation.4 Facing the safety flying during proximity orbit maneuver, a safety trajectory guidance strategy is shown. Because vector can describe magnitude and direction of the status messages and control messages at the same time, so relative position and relative velocity can be described by vector. New concept of safety area and safety angle are defined, then the control parameters and judging principia of the collision avoidance and plume contamination avoidance are brought forward. The results of the simulation indicate that the safety trajectory guidance strategy can achieve safety maneuver flying of the small satellite proximity operation when using thrust control method.