The Fast Algorithm for Time Windows of Area Target Observation Using Earth Observation Satellites

To reduce the calculation of the time windows of area target observation for earth observation satellites,the fast algorithm was proposed to estimate the time windows according to the model of area target observation by satellites established using the circle locally approximation to the ground trace in this paper.The details of the algorithm were given out.The simulation results showed that the time instant errors of entry-access were smaller than 0.5 s,the period errors of the time windows were less than 0.723%,and the computation time was decreased 99.87% over the classical propagation method.