David,

There is a seismic network set up in several places that use high precision GPS to monitor ground movement.  JPL was involved with one of those while I was there.  Of course back then the "P" code that had nearly the precision of the L band wavelength was forbidden to civilians and non-military users.  So we got the same precision by using interferometery and multiple GPS satellites.

Just a guess.

Art

-- 
Arthur I. Zygielbaum, K0AIZ
ARRL Midwest Division Director
Chair, Ethics and Elections Committee
Member, Programs and Services Committee
ARRL - The National Association for Amateur Radio®

Any ideas about these “mystery antennas” around Salt Lake City?

I assume some sort of radio.  Does anyone know?

https://tinyurl.com/ykpw7u55

73, Dave K3ZJ

 

David R. Siddall

Managing Partner

DS Law, PLLC

1629 K St. NW, Ste 300

Washington, DC 20006

direct: +1 202 559 4690

 

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