Yesterday I was talking to John Evers about what I had been doing for the day. I had one Triumph-2 on our office base station broadcasting RTCM 3 corrections over TCP. The job site was 15.9 miles from the base. I carried a second Triumph-2 to be used on site as my base with UHF.
I collected a point, L001, with the rover using the office corrections, 15.9 miles away. I collected for 1500 epochs at 5Hz. I then set the second Triumph-2 as a base on this point and collected points on site. The on site Triumph-2 was collecting raw data (as is mandatory using base rover setup). I submitted the raw file from the on site base to DPOS this morning.
John asked me what I expected the variation to be between the DPOS position and the 15.9 mile RTK vector. I guessed that it would be within 0.10 usft horizontal and 0.2-0.3 usft vertical. The results:
Horizontal shift: 0.07usft
Vertical shift: -0.20usft
Pretty amazing results!
I would not recommend doing production work at this range. Collecting the 1500 epochs required quite a few minutes because fixes are not as fast at this range. I think it's fine for establishing an on site base point as I did here, but I wouldn't want to collect numerous points this way.
15.9 Mile Vector:
DPOS Solution:
I collected a point, L001, with the rover using the office corrections, 15.9 miles away. I collected for 1500 epochs at 5Hz. I then set the second Triumph-2 as a base on this point and collected points on site. The on site Triumph-2 was collecting raw data (as is mandatory using base rover setup). I submitted the raw file from the on site base to DPOS this morning.
John asked me what I expected the variation to be between the DPOS position and the 15.9 mile RTK vector. I guessed that it would be within 0.10 usft horizontal and 0.2-0.3 usft vertical. The results:
Horizontal shift: 0.07usft
Vertical shift: -0.20usft
Pretty amazing results!
I would not recommend doing production work at this range. Collecting the 1500 epochs required quite a few minutes because fixes are not as fast at this range. I think it's fine for establishing an on site base point as I did here, but I wouldn't want to collect numerous points this way.
15.9 Mile Vector:
DPOS Solution: