Got
some good techie stuff for you sir r.e. GWEN towers.
First of all though, this is some pertinent info to understand the history
etc.
[excerpt]
Although the federally-provided
NDGPS
funding for this current fiscal year fell short, by about one-half of the
amount requested, there is ample budget to begin the process of adding new
broadcast stations. Fortunately, for New Mexicans, Albuquerque's Kirtland
Air Force Base will be the site of one of the first newly-established NDGPS
stations. We anticipate that the Kirtland station will be operational by
April 2000. Under an exemplary cooperative effort, many government agencies
are contributing to this program. The US Air Force is making available a
de-classified / de-commissioned network of emergency communications facilities,
the Ground Wave Emergency Network (GWEN). A total of 53 GWEN sites located
around the country will be converted from their old communications configurations
to real-time GPS reference station installations. Differential corrections
will be broadcast, at around 300 kHz, from 90-meter-tall GWEN transmission
towers.
[EXCERPT #2]
The Nationwide Differential expansion is continuing to make progress. Funding
for this year is about half of the administration's request. Single coverage
expected in 2002 is now hoped for the year 2003. Last year, the Coast
Guard’s Nationwide DGPS
(NDGPS)
implementation team was very busy refining the procedures for converting
a GWEN (U.S. Air Force Ground Wave Emergency Network) site to an NDGPS site.
To date, there are twelve sites that have been fully converted from their
GWEN configurations to transmit DGPS corrections. These sites are located
near Chico CA, Clark SD, Driver VA, Penobscot ME, Savannah GA, Macon GA,
Whitney NE, Hudson Falls, NY, Billings MT, New Bern NC, Summerfield TX and
Flagstaff AZ. The site at Appleton WA continues operation in its test
configuration and the site near Hartsville TN increased its antenna to 299
feet.
So the old GWEN system was converted to be used for the new NDGPS system.
Nationwide Differential GPS
.
Here is the official .gov site for some good tidbits:
http://www.navcen.uscg.gov/dgps/default.htm
NDGPS NETWORK
ENHANCMENTS IN FY01
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