2021 年 20 巻 p. 37-46
This paper proposes an optimal planning method of imaging multiple points on Earth from a spacecraft that is equipped with a pyramid type Control Moment Gyros (CMGs) as the attitude control actuators. The purpose of the planning is to maximize the number of cities to be imaged with better quality during multiple orbiting. The problem results in the optimization of selection of target cities and imaging orders under the constraints of the candidate cities, position of the spacecraft and the attitude maneuvering time. In order for better quality of the images, we consider minimization of the sum of the distance between the spacecraft and the target cities in the city selection procedure. Estimating the attitude maneuvering time with CMGs usually takes long due to the complexity, therefore, we also propose a faster estimation method of the maneuvering time by approximation. The proposed planning method is applied to the imaging of 292 cities around the world along 10 satellite paths, and its validity is evaluated through numerical simulations.