Research On Agile Imaging Satellite Mission Planning Method

Mission planning is an important part for satellites operation,which includes scheduling resources for users' requirements.The autonomous mission planning is the key technology to realize the spacecraft independent control.The expansion of different imaging modes and the changes in observation methods have brought great impact to the imaging satellite mission planning.Therefore,it is necessary to explore the new autonomous mission planning method for agile satellites.This paper starts with the autonomous mission planning under the different mission objectives of a single satellite and does research on the autonomous mission planning method for the single point and area target.On this basis,the task allocation method of multi-satellite and the re-planning method under fault state are designed for the task mode of multi-satellite cooperative work.Firstly,guided by mission requirements,starting from the imaging principle of agile satellites,the input and output of planning are established,and the satellite kinematics model is introduced into the mission planning field to establish the constraints of mission planning.Then,for the densely distributed point targets,a point target task preprocessing scheme based on task clustering is proposed,and a two-layer tabu algorithm is used to search hierarchically in the cluster layer and the global layer to obtain the optimal observation path sequence.The simulation results show that the algorithm can effectively reduce the task planning time of large-scale point targets while ensuring the optimal solution quality.Then,for the regional target coverage imaging problem,the drift angle constraint that restricts the imaging quality is introduced.By the method of discretizing the regional target mesh,the observation path design problem is transformed into the mission scheduling problem,and the ant colony algorithm based on the sense and consciousness strategy is adopted to search the optimal observation sequence.The simulation results show that the proposed path can satisfy the imaging requirements of the camera.Finally,based on the task assignment problem of multiple spacecraft cooperative work,a multi-agent collaboration model based on bidding strategy is proposed,and interactive task re-planning method based on the original planning scheme under the premise of failure.The simulation results show that the computational resource consumption of the task assignment process is low and the system balance is good,which is suitable for response processing under fault conditions.