A method for synchronizing a master clock and a remote slave clock which nominally has the same pulse frequency but may be out of time-phase comprising transmitting a master pulse to the slave, measuring the time delay, .DELTA..tau., between the received pulse and the nearest succeeding (in time) slave...http://www.google.fr/patents/US4368987?utm_source=gb-gplus-shareBrevet US4368987 - Conjugate-phase, remote-clock synchronizer
