RTK GPS
Howto
You can use a small computer + simple receiver with antenna to get cm accuracy GPS correction signals. Here is how to set up a reference station using a <$300 receiver + antenna. [1]. THis is good to 2 mm, with service degrading 1.5 cm every 10 km. So you can set up one, for a working region.
Can you do RTK correction in software, without the $300 receiver? Yes, a chip - $10 - but you need some basic stuff around the chip.
Turnkey correction station: $700. https://www.sparkfun.com/products/22429
Bottom line: take 2 cheap GPS receivers, process them with open source RTKLIB but only for windows [2].
Linux version of RKTLIB - [3]
From description, looks like F9P is overkill, simple RTK could be implemented with simpler GPS receiver chips. If they output raw data, we can process it. [4]
Multiband GNSS receiver - then process the signal. [5]
U-Blox seems to be a leader - who are others?
Basics
- Up to 20 times per second update rate [6]
- Resolution drops to a few centimeters once base station is 10km from moving node [7].
- A Method of Satellite Navigation/Survey that utilizes one or more constellations, and a Base Station
- This allows for 1cm Level Accuracy
- Refresh Rate Typically Can Be ~1hz, but 20hz Models Exist (According to SparkFun, further looking around can be done if need be)
- Useful mainly for Surveying and Precise Remotely Operated / Autonomous Vehicles
- Low cost cm accuracy in GPS using GLNS module with android - [8]
How Are Boundaries Recorded
- There is a legal description like [Sec 32, T8N, R1E, E 1/2 of NW 1/4 Ex Com at NW Cor of Sd E 1/2 of NW 1/2, Th E Alg N Ln of Sec 140 ft, S Parl with N&S 1/4 Ln of Sec 311 Ft. W Parl With N Sec Ln 140 ft, N 311 Ft to Beg)] [9]
- Missouri has corner posts at all sections (mile squares) and at the quarter section (mid point between section corners) [10]
