The Proximity-1 Space Link Interleaved Time Synchronization (PITS) protocol provides time distribution and synchronization services for space systems. A software prototype implementation of the PITS algorithm has been developed that also provides the test harness to evaluate the key functionalities of PITS with simulated data source and sink.

PITS integrates time synchronization functionality into the link layer of the CCSDS Proximity-1 Space Link Protocol. The software prototype implements the network packet format, data structures, and transmit- and receive-timestamp function for a time server and a client. The software also simulates the transmitand receive-time stamp exchanges via UDP (User Datagram Protocol ) socket between a time server and a time client, and produces relative time offsets and delay estimates.

This work was done by Simon S. Woo, John R. Veregge, Jay L. Gao, and Loren P. Clare of Caltech; and David Mills of the University of Delaware for NASA’s Jet Propulsion Laboratory. For more information, contact This email address is being protected from spambots. You need JavaScript enabled to view it..

This software is available for commercial licensing. Please contact Daniel Broderick of the California Institute of Technology at This email address is being protected from spambots. You need JavaScript enabled to view it.. NPO-47404


NASA Tech Briefs Magazine

This article first appeared in the December, 2012 issue of NASA Tech Briefs Magazine.

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