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Tipton, KS | AG25 was used in agriculture and by surveyors, and in the antenna database (1), it is listed as TRM39105.00
When this antenna is pointed in true North position (pic below: marked in red), several four hour or more OPUS evaluations will pin down its location better, and GNSS carrier phase signals (2) will be in proper alignment (otherwise, "errors at the centimeter level").
To use OPUS, simply follow these 5 steps: (3)
1.Upload your data file (Rinex 2/3, et al)
2. Select your antenna type: TRM39105.00
3. Enter your ARP height in meters (4)
4. email address
5. Click on Upload to Static
"The most accurate OPUS solutions have the following characteristics:
Orbits used are precise or rapid
Over 90% of observations are used
Over 50% of ambiguities are fixed
The correct antenna type and ARP height are entered
.....
Example: I have deleted the first two digits in location info below with xx
OBS USED: 5817 / 6188 : 94%
FIXED AMB: 34 / 40 : 85%
OVERALL RMS: 0.017(m)
REF FRAME: NAD_83(2011)(EPOCH:2010.0000)
X: -xx0875.861(m) 0.011(m)
Y: -xx90861.680(m) 0.007(m)
Z: xx20642.566(m) 0.004(m)
With these XYZ values above using NAD_83(2011) results, the NGS Coordinate Conversion and Transformation Tool (NCAT) must be used to convert them, check the XYZ box at this site before entering these values.
1. https://www.ngs.noaa.gov/ANTCAL/
2. https://www.ngs.noaa.gov/ANTCAL/FAQ.xhtml
3. https://www.ngs.noaa.gov/OPUS/
4. https://www.ngs.noaa.gov/OPUS/about.jsp
5. NGS Coordinate Conversion and Transformation Tool (NCAT)
https://www.ngs.noaa.gov/NCAT/
 (Screenshot 2024-05-27 185126 (full).jpg)
Attachments
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 Screenshot 2024-05-27 185126 (full).jpg (49KB - 103 downloads)
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AG25: OPUS How To
