Locating system
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United States of America Patent
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-
Sep 1, 1992
Grant Date -
N/A
app pub date -
Jul 9, 1990
filing date -
Jul 22, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for locating a transponder (10) to an accuracy of plus or minus about 10 m in an area about 5 km across includes a master station (12) and two slave stations (14, 16) at known positions. The transponder and the two slaves each incorporates an electronic flywheel circuit and means to bring it into synchronism with a synchronizing signal from the master station. After a preset delay the transponder then transmits a radio signal to be received by the slave stations and by the master station, the time of receipt of which is measured at each. From these times the location of the transponder (10) is determined by a computer (18).
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