RTK GPS: Difference between revisions
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=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. [https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss-reference-station/introduction]. 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 [https://www.rtklib.com/]. | |||
Linux version of RKTLIB - [https://rtklibexplorer.wordpress.com/2020/12/18/building-rtklib-code-in-linux/#:~:text=The%20original%20RTKLIB%20did%20not%20support%20Linux%20for,describe%20building%20these%20on%20the%20Ubuntu%20platform%20below.] | |||
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. [https://www.u-blox.com/en/publication/beyond-stories/u-blox-f9-taking-gnss-precision-next-level#:~:text=Dead%20reckoning%3A%20The%20F9%20platform,and%20urban%20canyons%20with%20bridges.] | |||
Multiband GNSS receiver - then process the signal. [https://www.youtube.com/watch?v=_Am2DDGVWmE] | |||
U-Blox seems to be a leader - who are others? | |||
=Basics= | |||
*Up to 20 times per second update rate [https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all#:~:text=On%20top%20of%20these%20signals,to%2020%20times%20a%20second.] | |||
*Resolution drops to a few centimeters once base station is 10km from moving node [https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all#:~:text=On%20top%20of%20these%20signals,to%2020%20times%20a%20second.]. | |||
*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 - [https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DZ_C33io_8S4&ved=2ahUKEwjwoN7_-4L7AhUyHzQIHcS0AnIQtwJ6BAgXEAI&usg=AOvVaw38MSns7-BRBK8Wx6oPMKdr] | *Low cost cm accuracy in GPS using GLNS module with android - [https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DZ_C33io_8S4&ved=2ahUKEwjwoN7_-4L7AhUyHzQIHcS0AnIQtwJ6BAgXEAI&usg=AOvVaw38MSns7-BRBK8Wx6oPMKdr] | ||
=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)] [https://talk.newagtalk.com/forums/thread-view.asp?tid=479423&DisplayType=flat&setCookie=1] | |||
*Missouri has corner posts at all sections (mile squares) and at the quarter section (mid point between section corners) [https://agriculture.mo.gov/weights/landsurvey/pdf/pub2203.pdf] | |||
=Internal Links= | |||
*[[Survey Pole]] | |||
*[[Open Source RTK GPS Unit]] / [[RTK GPS Units]] | |||
*[[Differential GPS]] | |||
*[[LORAN-C]] | |||
=External Links= | |||
*[https://en.wikipedia.org/wiki/Real-time_kinematic_positioning The Wikipedia Page on Real-time kinematic positioning] | |||
*[https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all Sparkfun Article Titled "What is GPS RTK?" ] | |||
[[Category: Cartography, GIS, Maps, and Surveying]] | |||
Latest revision as of 23:20, 10 August 2023
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]