| 摘要 |
<p>A system for determining positions of fixed-position slave receivers (6) includes a data recording and control center (12), a base GPS receiver (3) with an associated antenna with a substantially unrestricted view of the sky and the slave receivers (6) that acquire and track GPS satellite signals at the fixed positions. The system processes range information provided by the slave receivers (6) over an extended period of time and determines positions using range data that are valid. In this way, the precise positions of the respective slave receivers (6) can be calculated, even if the slave receivers (6) are able to observe and collect data from sets of two or more satellites (9) for only three or four relatively short time intervals at various sky positions during the extended period. The data recording and control center (12) provides the calculated positions to the slave receivers (6), which may then produce timing signals that are based on the GPS codes and synchronized across the system.
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