Patent ID: 6492937
Filing Date: 2002-12-10
Classification: G01S

Abstract:
A method of measuring distance between two platforms with high precision, comprising the steps of:determining an estimate of distance D between the two platforms within a first range of error; transmitting an RF signal from a range-only radar located on a first platform; receiving the RF signal transmitted by the range-only radar on the first platform by a repeater located on a second platform; retransmitting the RF signal by the repeater on the second platform; receiving the retransmitted RF signal by the range-only radar located on the first platform; measuring phase difference between the RF signal transmitted by the range-only radar located on the first platform and the RF signal retransmitted by the repeater located on the second platform; converting the measured phase difference to a measure of distance &dgr;; and adding the estimate of the distance D to the measure of distance &dgr;, to obtain a measure of total distance between the two platforms.