What is the maximum baseline length recommended for L1 GPS and minimum occupation time for post processed static. I have read many times that an occupation of 1 hour on a baseline of 20km is useable for tying in control for topographic surveys.
What are your experiences with L1 static work?
Baseline Length L1 GPS Depends
Where are you?
How Many receivers?
How many control points?
How many CORS?
What post processing software?
When I had L1 only receivers, I always used 3 minimum. I could set control from 3 CORS (2 hours, within 60 Km) if I was inside the polygon. I held the to 20 Km when using a single offsite control. I could borrow a few more for some projects.
Once I began using L1/L2 mixed with L1 receivers I occasional turned off the L2 processing to get better results L1 only.
Post process yourself using OPUS techniques. Import data from three CORS, hold each one fixed separately and solve your 3 L1 points. You want a D&R traverse connecting the L1 points. Resolve and hold your best L1 point fixed, solve the network compare the solved CORS versus published positions. That gives you your accuracy range. Do not allow your post processor to solve the CORS to CORS vectors. You want to be inside the CORS polygon to average out the unknown atmospheric correction.
If I used a combination of CORS and a nearby vertical control point, I would fix a CORS horizontally and fixed the vertical for elevation.
Nowadays I would create a VRS point on site and use a minimal baseline solution.
Paul in PA