|IGS-type acronym :||USN3|
|Installed date :||2004-06-28|
|Decommissioned date :||2014-11-19|
|Station status :||Decommissioned (white and red cross)|
|Distance to Tide Gauge (m) :||6525|
|Station operator:||(USNO) - U.S. Naval Observatory|
|IGS-like station form :|
|M||Material change or malfunction|
Plots generated using software developed with the EPN team at ROB
|Observations & tracking performance||Satellite tracking|
Back in November 2014 the antenna mount for USN3/USN4/USN5 was raised 1.5m. At that time USN3 was renamed to USN7. USN4/USN5 should have also been renamed at the same time since all three share the same antenna. The replacement station names for USN4/USN5 are USN8/USN9.
Urgent: USN3 antenna type and location (height) has been significantly changed.
At least one daily 30s file from Nov 18 was unintentionally published
which did not include necessary changes in metadata (RINEX header).
Processing will result in a position that is ~5 -feet- higher than nominal.
Suggest not using any subsequent USN3 data until further notice.
IGS Data centers should remove these erroneous files.
Data will be backfilled with appropriate headers as soon as the entire
scope of the change is fully documented.
USN3 renamed USN7 in nov 2014