| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect a landings position without using a position detecting instrument mounted on a spacecraft by arranging multiple vibration detecting means in the estimated landing range on the ground, and measuring the ground vibration and time generated by the natural fall of the spacecraft. SOLUTION: The vibration detecting means 2 has the function to measure the longitudinal waves and transversal waves of seismic waves and transmit the measured data. The vibration detecting means 2 are arranged at constant intervals La on two straight lines on both sides of the longitudinal direction of the estimated landing range 1 set together with the atmosphere re-entry position of a spacecraft S in advance. The interval La is set to 20Km, for example, and the vibration detecting means 2 are arranged in turn on the right and left at every 10Km. The estimated landing range 1 including the landing point X is calculated prior to 48hr before the re-entry of the spacecraft S into the atmosphere, the vibration detecting means 2 are completely installed prior to 24hr before the re-entry, and a mobile station M receiving the measured data starts waiting prior to 12hr before the re-entry. The spacecraft S makes a natural fall in the estimated landing range 1, the ground vibrations generated by the drop and the time are measured by the vibration detecting means 2 arranged at multiple positions, and the landing point of the spacecraft S is detected.</p> |
