In a previous thread, it was noted that PM2 antenna parameters can now be found on the Ashtech web site. The document referenced provides basic dimensions, but doesn't discuss azimuth/elevation corrections.

I'm interested in adding the PM2 antenna to the database used by TGO, which appears to make use of these corrections. Has Ashtech determined this information, and is it available?

Thanks.

P.S. Below is an example of an antenna type file used by TGO. I'm guessing as to the interpretation of the numbers, but it appears that the effective elevation the L1 offset changes by up to 4.6mm. This obviously isn't a big deal, but I'm all for beating errors into submission wherever practical, thus my inquiry.

;Processor name : WAVE Alpha
;Calibration time : Fri Feb 14 16:41:55 1997
;Reference antenna : Dorne Margolin Model T
;Calibrated antenna : Ashtech Geodetic L1/L2 L
;Model order : 0 x 10

;Mean phase center (mm) North East Up
L1NominalOffset = -1.9 0.4 21.2 ; 85.2 - 64
L2NominalOffset = -3.1 2.8 21.6 ; 85.6 - 64

;Elevation range (deg) Start Stop Step
ElevationRange = 5 90 5

;Azimuth step size (deg)
AzimuthStep = 0

;Azimuth/elevation corrections (mm)

AZ=0

;L1
2.5 2.2 2.8 3.5 4.0 4.3 4.5 4.6 4.5 4.4
4.2 3.9 3.4 2.8 2.2 1.5 0.7 0.0
;L2
-1.7 -1.6 -0.6 0.6 1.8 2.6 3.1 3.3 3.2 3.0
2.7 2.3 2.0 1.6 1.3 0.9 0.5 0.0

Jim,

I believe the numbers you want are available in the NGS test report. That stuff bores me to tears so I worry about what will make the antenna work with Ashtech Solutions.

http://www.ngs.noaa.gov/ANTCAL/Models/ASH110454.shtml

This is straight from the horse and should let you go hog wild with your science projects.
Modified By Phillip Stevenson on 11/12/2001 at 12:09 AM

That's what I was looking for -- thanks.