| 摘要 |
PURPOSE: A method is provided to achieve an in-advance estimation for the drop-down orbit and spot with accuracy. CONSTITUTION: A method comprises a first step of setting a scope of ballistic coefficient and a spacing and obtaining observation data for orbit element of satellite, a second step of sequentially accumulating spacings starting from the minimum ballistic coefficient and setting each value as a ballistic coefficient, a third step of judging whether the set ballistic coefficient and the maximum ballistic coefficient are the same, and a fourth step of calculating estimation data for location and speed of the satellite using the set ballistic coefficient and a general calculation method, obtaining a difference between the estimation data and the observation data for each time unit, squaring the difference, accumulating the square value for each ballistic coefficient, and feeding back to the second step, if the set ballistic coefficient is not same with the maximum ballistic coefficient, while setting the ballistic coefficient having the least value from among the accumulated value of the square value for each ballistic coefficient, as an optimum ballistic coefficient, if the set ballistic coefficient is same with the maximum ballistic coefficient.
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