Abstract
A satellite mission instruction generation algorithm based on a flexible weighted directed graph has been proposed. This algorithm can sort the instruction into sequence according to the instruction execution relationship with constraints, which can promote satellite operation performance of the ground station. Concepts like flexible edge, flexible zone, and implement zone were introduced, and the flexible weighted directed graph (FWDG) model was proposed. Based on this model, the satellite instruction sequence generation algorithm was designed. After practice and research, the result showed that according to the new algorithm, the instruction sequence can be consistent with all implement zones, consequently guaranteeing the correctness of the sequence.
Highlights
A low earth orbit remote sensing satellite with high resolution is the main channel to acquire ground information, which plays an increasingly important role in an earth optical and microwave survey [1]
The satellite instruction sequence generation algorithm based on the weighted directed graph (WDG) presented in References [12, 13] can sort the satellite instruction sequence according to the constraint relation, and the operation efficiency of the ground control center to the spacecraft is greatly reduced
In order to meet the more realistic and strict requirements of a satellite instruction transmission time slot, we propose an instruction generation algorithm based on a flexible weighted directed acyclic graph (FWDAG)
Summary
A low earth orbit remote sensing satellite with high resolution is the main channel to acquire ground information, which plays an increasingly important role in an earth optical and microwave survey [1]. In References [9–11], the method of dynamically adjusting the results of planning such as task replanning is proposed, but the deviation between task planning and task execution cannot be considered On this basis, the satellite instruction sequence generation algorithm based on the weighted directed graph (WDG) presented in References [12, 13] can sort the satellite instruction sequence according to the constraint relation, and the operation efficiency of the ground control center to the spacecraft is greatly reduced. 2. Satellite Instruction Sequence Generation Algorithm Based on the Directed Graph Model. A unified instruction topological sequence can be generated by Algorithm 1, after digraph modeling of a sensing task, according to the start time of the mission on the satellite, the interval of the basic instruction sequence, and the dependence of different instruction sequences. Algorithm 1 cannot take into account this constraint, and the calculated results cannot meet this requirement
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