| 摘要 |
A system (10) is described for providing ephemeris data of a second object (12) relative to a first object (30), the first object (30) and the second object (12) being separated by a distance substantially greater than 20,000 kilometers. The system comprises plural transmitters (14, 16, 18, 20, 22, and 24) located within 20,000 kilometers of the first object (30) for transmitting information relating to the ephemeris thereof relative to the first object (30) and time; a receiver located on the second object (12) for receiving the information, and a processor located on the second object (12) for processing the information and providing signals relating to the ephemeris of the second object (12) (Fig. 10). <IMAGE> |
