When a target is in range of a satellite, a minimum swath width (eta) is calculated to account for attitude changes of the satellite, and represent the width which is certain to be within targeting range of the satellite. A push-broom trajectory, which represents the projection of the satellites path onto the imaged surface, is calculated using the minimum strip width and the boundaries of the targeted region. The push-broom trajectory and the minimum strip width are then substituted into a model, which uses a conjugate quaternion-based coordinate transformation, to calculate coordinates of the four vertices of the strip. To ensure coverage of the entire region by overlapping strips, the planes containing the push-broom trajectories may be generated recursively. The final strip may be corrected, by shortening it and/or moving it inwards, to avoid redundancies in detection. Strips to cover linear targets may be obtained by fitting using forward matching.
Agile satellite target decomposition method and system based on push-broom trajectory
2021-04-07
Patent
Elektronische Ressource
Englisch
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