We have some more testing results. This time with both Static and RTK comparisons. Still Excellent Results!!
To save me drive time for testing, I decided to set a monument in my back yard. It wasn’t the best setup, but should do for my initial RTK tests. I used the center of a screw head on the top railing of the deck in my back yard. To get some good coordinates on the point I setup the REACH in static mode and recorded a 20 minute observation. I repeated the same observation 5 days later at a different time of the day. These two observations were post-processed to a CORS monument ~1.9 miles (3 Km) away. I took those coordinates and averaged them together, even though they were only off by a few mm Next, I processed the same observations to a CORS monument 21.8 miles (35.1 Km) away. This was to test the “worst case” scenario for a long distance baseline with a short observation time. Finally, I setup my REACH on our statewide NTRIP server and performed to RTK Fixed observations and recorded the coordinates. It should be noted that I have utilized this NTRIP server with Trimble R8 GNSS instruments for many years and the vertical error between the RTK corrections and NGS monuments are always around 0.15 feet or 4cm. The REACH showed the exact same errors with the RTK corrections…
Attached is a table showing the differences between all of the observations. In case you don’t want to download and examine the table, here is a summary of the results.
Short Baseline Static = less than 1 cm repeatable error in x, y, z
Long Baseline Static = less than ~1 m repeatable error in x, y; less than ~3 m repeatable error in z
RTK with NTRIP = less than ~2cm repeatable error in x, y; less than ~5cm repeatable error in z
RTK vs Post-Process Compare.pdf (31.8 KB)
We are now planning to test these same observations on a mm accurate NGS permanent monument in my area. It may take a few weeks for us to get the observations and post results, but I’ll post them here when complete. We’re also planning to test the REACH mounted on a multi-rotor for high-accuracy photogrammetry with and without GCP’s.