With slow frequency hopping, a propagation phase can be obtained for each frequency that is sent. The propagation phase for any one frequency yields an ambiguous range. In using the phases from a set of frequencies, it is possible to obtain a reliable, unambiguous range. However if the range is changing while the set of phases is being read, the task of determining the range becomes quite difficult. The range solution is only possible if a precise velocity is known at the time of the phase readings. This paper explains how a set of propagation delays can be adjusted with the velocity to determine a unique range distance
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