Importance

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Abstract

An accurate radio frequency ranging system is provided for measuring the time of transmission of a signal from a first station to a second station and back to the first station without coherent turn-around of the signal. Each of the two stations is provided with its own range measuring means and its own reference clock. The first station range measuring device is started by the first station reference marker and is stopped by the second station reference marker start signal transmitted from the second station to provide a first range measurement. The second station range measuring device is started by the second station reference marker and is stopped by the reference marker start signal transmitted from the first station to provide a second range measurement. The sum of the two range measurements contains the data necessary to calculate the true range between stations and the difference between the two range measurements contains the data necessary to calculate the offset between the two reference clocks without the two reference clocks being synchronized or locked to each other.

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First Claim