| 摘要 |
A system to navigate aircraft employing an earth satellite emitting stored signals from its memory device at predetermined times, controlled by a precision clock. The aircraft desiring navigation aid, having an atomic clock synchronized with the satellite's, can thus calculate the propagation delay and the distance travelled by the signal. A computer aboard the aircraft generates a mathematical representation of a sphere, the radius being equal to the distance travelled by the satellite signal. Employing an inertial navigation set linked to the computer, the computer generates two additional spheres, each displaced from the previous sphere by the distance the aircraft travelled prior to receiving the succeeding satellite transmission. The intersection point of the three spheres is the location of the satellite. Knowing the satellite trajectory in advance, the aircraft can thus determine its position with respect to the earth.
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