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GeezerVison is showing www.sparkfun.com — RTK Solutions - SparkFun Electronics  If you're in need of high-precision positioning, look no further than utilizing the power of RTK. What used to be very expensive and limited to certain professions is now more affordable and readily available to everyone. RTK GNSSRTK is short for real-time kinematics. A GNSS receiver capable of RTK takes in the normal signals from the Global Navigation Satellite Systems along with a correction stream to achieve centimeter-level positional accuracy. Why is RTK necessary for high-precision measurements?The simple explanation is that a lot can happen to the signals coming from GNSS satellites before they reach ground level. Remember, the GPS satellites are very far away - about 20,000km or 12,000 miles away. Since a GNSS receiver pinpoints location by calculating the distance between you and satellites, everything comes down to timing. Geomagnetic storms cause slight timing delays which can cause location errors. Also, relativistic effects cause orbiting clocks to tick slightly faster than they would on earth. The mere microsecond differences between orbiting clocks and clocks on earth can add up to inaccuracies. RTK corrections help fix these inaccuracies by sending correction data from "surveyed-in" base stations or even geosynchronous satellites! What is needed to utilize the accuracy of RTK corrections?There are two main things that you'll need in order to use RTK:
Similar to most any GNSS receiver, a receiver capable of receiving RTK corrections takes GNSS location data from GPS (USA), GLONASS (Russia), Beidou (China), and Galileo (Europe) satellites. On top of these signals, an RTK receiver takes in an RTCM correction stream to calculate your location with 1cm accuracy in real time. RTCM is technically just a government-created protocol that is now used to signify the bytes of correction data related to GNSS timing anomalies. These bytes of data are what allow us to calculate down to millimeter-level accuracy. If you want a deeper dive into learning about RTK, see our What is GPS RTK? tutorial to learn more.  Learn about the latest generation of GPS and GNSS receivers to get 14mm positional accuracy!  Compare RTK GNSS Development BoardsAchieving high-precision positioning requires the right equipment. Achieving accuracy on a millimeter scale requires the right equipment. All of SparkFun's boards listed below are capable of receiving RTK corrections. Also, each SparkFun RTK Development Board has it's own hookup guide to show you how to make it all work.  The X20P is the latest GNSS engine from u-blox, a successor to their popular F9 engine and capable of L-band correctons reception.
 The Quectel LG580P is a quad-band GNSS RTK receiver that uses dual-antenna technology to determine instantaneous heading, perfect for advanced navigation and robotics applications.
 The LG290P module from Quectel is a quad-band, multi-constellation, high-precision, RTK GNSS receiver.
 Utilizing the mosaic-X5 module from Septentrio, this professional grade triband (L1/L2/L5) GNSS receiver board for centimeter-level precision.
 This triband GNSS Breakout features the UM980 RTK position module from Unicore Communications.
 A top-of-the-line development board for high accuracy GNSS location solutions including RTK that is capable of millimeter-level, three-dimensional accuracy with a U.FL connector.
 A top-of-the-line development board for high accuracy GNSS location solutions including RTK that is capable of millimeter-level, three-dimensional accuracy with an SMA connector.
 A powerful development board for the NEO-M8P-2 module from u-blox that can achieve horizontal accuracy within one inch.
This highly accurate, Professional Grade development board uses a u-blox ZED-F9R module in conjunction with 3D IMU sensor, wheel ticks, a vehicle dynamics model, correction data, and GNSS measurements to maintain positional accuracy even in poor signal conditions.
This highly accurate, Professional Grade Raspberry Pi pHAT uses a u-blox ZED-F9R module in conjunction with 3D IMU sensor, wheel ticks, a vehicle dynamics model, correction data, and GNSS measurements to maintain positional accuracy even in poor signal conditions.
 Looking for a more off-the-shelf solution for RTK positioning?SparkFun has a lineup of enclosed, affordable and ready-to-use GNSS receivers and kits that can be used as base stations or rovers for millimeter-level positioning. No programming required! RTK Use CasesThere's certainly no right or wrong way to utilize RTK corrections. Below are three of the more common setups used for high-precision positioning. Base Station + Rover + Radio/PhoneIf you don't mind setting up your own base station and need maximum portability then this may be the solution for you. With this setup you would build your own base station or use the SparkFun RTK Reference Station and let it "survey in" for around 24 hours. As long as your rover is within ~20km of your base station, then your rover will receive absolute accuracy. Corrections are sent from the base to the rover via a radio connection or cell phone. This method is also very useful for very accurate relative distance (the distance between the base and the rover) with a much quicker "survey-in" time of ~60 seconds. This is a carousel. Use Next and Previous buttons to navigate, or jump to a slide with the slide dots. Pros:
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 Paid Permanent Base + Rover + CellphoneIf you don't have a base station, or don't want to maintain one, you can use services like u-blox's PointPerfect, Skylark, or other services to get correction data over the Internet and deliver it to your rover using your cellphone's internet connection. Based on the location of your rover, your cellphone can receive correction data from an existing nearby base station where corrections are sent to the Internet (NTRIP Network) and then passed on to your phone over the cellular network. Your cell phone then communicates the correction data (via Bluetooth or WiFi) to your rover. Pros:
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 L-Band RoverThis method is really great for all uses, but it especially comes in handy when you need highly-accurate positioning in more remote locations without cell service and/or you don't have a base station close enough to receive corrections data. Rovers with an L-Band antenna (and a monthly subscription) can receive RTK correction data from a geosynchronous Inmarsat Satellite without the need for a base station. Currently, SparkFun offers the Facet RTK L-Band which is a single device that can receive normal GNSS reception as well as the the L-Band reception needed to get correction data from a geosynchronous Inmarsat satellite. You can learn more about how all this works in our RTK Facet Hookup Guide. Pros:
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 RTK GNSS AccessoriesYou'll need more than a development board for your RTK GNSS setup. Below are some commonly bought items to complete your system.
Helpful Resources Using RTKLearn how to build a reference station, set up a rover base and learn more about RTK with our helpful resources below.  Getting GNSS RTCM correction data from a base to a rover is easy with a serial telemetry radio! We'll show you how to get your high precision RTK GNSS system setup and running.  Learn how to affix a GNSS antenna, use PPP to get its ECEF coordinates and then broadcast your own RTCM data over the internet and cellular using NTRIP to increase rover reception to 10km!  Interested in high precision GNSS without setting up a base station?  Learn about the latest generation of GPS and GNSS receivers to get 14mm positional accuracy!  Correction data is used in surveying and navigation to enhance the accuracy of GNSS. Learn here about what types of errors it fixes, how you can use correction data in your projects.  Learn the tips and tricks to use the u-blox software tool to configure your GPS receiver. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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