| 摘要 |
An electronic ranging method and apparatus for determining and optionally displaying in real time the location (or relative position) of as many as one thousand geographically-separated stations or "users" within an operational zone by means of slant range measurement and trilateration. Each "user" is assigned a specific time slot which is precision-synchronized with those of all other users, and this time slot is utilized by the unit to which it is assigned for transmitting a signal which enables range measurements to be obtained with respect thereto by a plurality of other users in its area. The range data thus derived by each user is stored in a memory bank and subsequently transmitted in sequence to one or more master stations, where a computer resolves the received information to establish accurate positional locations of the individual units. Cyclic re-synchronization of the timing equipment of each user is also provided for, as well as an arrangement whereby each user unit may act in turn as a master station for re-synchronization purposes.
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