Unisys Corporation

L-3 Communications Corporation

Merle L Keller, Jr

Vaughn Lee Mower

Kent R Bruening

Steve J McEntire

Synchronization of a primary link which transitions between clear mode and spread mode is achieved and maintained using a secondary link. When transitioning from clear mode to spread mode, a primary transmission delta phase is adjusted by the difference between a secondary reception delta phase and the primary transmission delta phase; and a primary reception delta phase is adjusted to be equal to a secondary transmission delta phase.

Chip timing synchronization for link that transitions between clear and spread modes

A long phase-locked loop circuit is provided which has an electronic closure circuit in series in the loop. The loop is effectively an open loop until acquisition of the incoming signal at which time the electronic closure circuit closes the phase-locked loop. A novel coincidence circuit is provided which compares the carrier in the loop with a reference frequency and when the two frequencies are equal the coincidence circuit closes the electronic closure circuit.

Growing community of inventors

Salt Lake City, UT, United States of America

Merle L Keller, Jr