An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Parker, T.
and Matsakis, D.
(2004),
Time and Frequency Dissemination: Advances in GPS Transfer Techniques, GPS World, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921052
(Accessed May 4, 2024)