With GPS you are able to know where you are, where you're going, and how to get there anywhere on Earth within 30 seconds. This means the higher the accuracy the better! GPS Real Time Kinematics (RTK) has mastered dialing in the accuracy on their GPS modules to to just millimeters, and that's why we had to put it on this board!
The SparkFun GPS-RTK2 raises the bar for high-precision GPS and is the latest in a line of powerful RTK boards featuring the ZED-F9P module from u-blox. The ZED-F9P is a top-of-the-line module for high accuracy GNSS and GPS location solutions including RTK that is capable of 10mm, three-dimensional accuracy. With this board, you will be able to know where your (or any object's) X, Y, and Z location is within roughly the width of your fingernail! The ZED-F9P is unique in that it is capable of both rover and base station operations. Utilizing our handy Qwiic system, no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1"-spaced pins in case you prefer to use a breadboard.
We've even included a rechargable backup battery to keep the latest module configuration and satellite data available for up to two weeks. This battery helps 'warm-start' the module decreasing the time-to-first-fix dramatically. This module features a survey-in mode allowing the module to become a base station and produce RTCM 3.x correction data.
The number of configuration options of the ZED-F9P is incredible! Geofencing, variable I2C address, variable update rates, even the high precision RTK solution can be increased to 20Hz. The GPS-RTK2 even has five communications ports which are all active simultaneously: USB-C (which enumerates as a COM port), UART1 (with 3.3V TTL), UART2 for RTCM reception (with 3.3V TTL), I2C (via the two Qwiic connnectors or broken out pins), and SPI.
We've also written an extensive Arduino library for u-blox modules to make reading and controlling the GPS-RTK2 over our Qwiic Connect System easy. Leave NMEA behind! Start using a much lighter weight binary interface and give your microcontroller (and its one serial port) a break. The SparkFun Arduino library shows how to read latitude, longitude, even heading and speed over I2C without the need for constant serial polling.
The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.
If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.
Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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It's early in the development cycle, so the device and the doc's for it have a few rough edges still. It also does L2 GPS data slightly differently than the survey gear does. That can lead to issues with a whole range of support and analysis software. Mine decided to move 40 M over night. I checked and the antenna is still right where it was yesterday .....The NetR9 running next to it had no issues ...
ZED-F9P is plug and play board, simple to use and does not need any setting adjustments prior to first use. I was using it together with Bluetooth Mate Silver for RTK correction. BT Mate was attached to the board like described in GPS-RTK2 Hookup Guide. Assumingy in one moment there was a shortcut between BT Mate and the ZED-F9P module (in the section where there are jumpers on ZED-F9P) and I was not been able to connect to the ZED-F9P module again. I also noticed that RTK led is barely on. I reccomend to put inslulating tape between BT mate and ZED-F9P board. I would like to buy a new one, but the price is just not that attractive.
I purchased two of these; one to act as a base station sending correction data to a rover. I am getting 14mm accuracy (estimated).
Only IMHO, the software library is missing some functionality and it really should be able to be used with less polling...more interrupt driven. Also, there are a couple of items in the Hookup Guide that could use some clarification.
This product has many terminals and can be used conveniently. It is also nice to provide design information. Very easy to use. I want to buy more, so I want to increase production quickly.
I have been using this in static mode and post-processing the data with RTKLIB. While I have not yet been able to verify the absolute accuracy of a fix with integer ambiguity resolution after post-processing, I did get a fix with 1800 points on 1 second epochs while on a hilltop that put all points within a 5mm circle. This would be survey grade accuracy for about 2% of the cost of a survey grade system. Have not yet attempted real-time kinematic operation yet.