Time to get RTK-correction in the field?

Q&A forumCategory: QuestionsTime to get RTK-correction in the field?
ihb_ardus_user asked 1 year ago

Hello there,
I tested my simpleRTKlite module in the field. For RTK-corrections I used the Lefebure-NTRIP app at my smartphone like shown in the ardusimple video (–> Bluetooth connection) and as alternative u-center at my field notebook (–> COM-Port). The correction were calculated using public reference station streams (SAPOS, Germany). I got fixes (DGPS, FLOAT-RTK,RTK), but they switched in short time periodes (1- 5 min). My position at a satellite layer reference map varied  at the level of meters. How long do I have to wait until my (rtk-)fix is precise enough to work with? Do I have to use any further corrections or configurations?
My test equipment was placed on a hill with nearly open sky close to a pylon of an electric power line.
How important is weather (cloudyness) or tree coverage (in forests)? What is about possible interfenceres with metal constructions or electromagnetic fields?

clive1 replied 1 year ago

Ideally needs a clear line of sight to satellites, figure at least 8-12 depending on the mix
Most important thing is a good antenna with an adequate ground-plane to block the indirect signals.
If your NTRIP source has good L1/L2 data for the satellites you can see, and is ideally with 7KM, you should expect it to get into FIXED RTK within tens of seconds.
If the data sources are 20-30 KM away you might need to set up a local base, perhaps at a geodetic marker or a location you have properly surveyed yourself.