Headline: How much does an RTK GNSS module cost?
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The cost of an RTK GNSS module is significantly higher than a standard GPS module, reflecting its advanced technology. Prices can range from a few hundred to over a thousand dollars, depending on its capabilities. A key cost driver is whether it's multi-band (L1/L2/L5), which is essential for professional performance. Another is the inclusion of advanced features like IMU sensor fusion. While it is a considerable investment, the ROI for professional users is immense. The time saved by not setting ground control points or the resource savings in precision agriculture often pays for the hardware very quickly. XYZ-GNSS focuses on delivering a high-performance RTK GNSS module that provides an exceptional value, making this powerful technology a profitable investment for our clients.
Headline: How do I provide RTK correction data (RTCM) to my module?
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Providing RTCM correction data to your RTK GNSS module is the critical step that enables high precision. The data typically comes from a base station or an NTRIP service. This data is then transmitted to your rover via a datalink, which can be a UHF radio, a LoRa radio, or a cellular modem (for NTRIP). The output of this datalink is a serial data stream. You must feed this RTCM stream into the serial receive (RX) port of your RTK GNSS module. The module's firmware, like that on XYZ-GNSS products, will automatically detect the RTCM messages and begin using them to correct its position. The host processor in your device is responsible for managing this data pipeline from the radio to the module.
Headline: Can a single module do both RTK base and rover functions?
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Yes, a high-quality RTK GNSS module is typically capable of operating in either "base" or "rover" mode, which is configured through software commands. This offers excellent flexibility. For example, you could purchase two identical modules from XYZ-GNSS. For one job, you might configure one as a base and the other as a rover. For another job, you could configure both as rovers and have them receive corrections from a public NTRIP network. The key is that the RTK GNSS module itself has the underlying hardware (multi-band) and firmware capabilities to perform the necessary calculations for either role. XYZ-GNSS ensures our modules are fully featured to support these flexible deployment scenarios.
Headline: What is the best RTK GNSS module for a Pixhawk/ArduPilot drone?
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The best RTK GNSS module for a Pixhawk or ArduPilot-based drone is one that is lightweight, multi-band, and well-supported by the community and the manufacturer. XYZ-GNSS offers several modules that are ideal for this ecosystem. Our SWaP-optimized modules provide the essential L1/L2/L5 band reception for a fast and reliable RTK fix, which is crucial for accurate mapping and navigation. They communicate using standard UART and NMEA/RTCM protocols, making them fully compatible with ArduPilot. By integrating a high-performance RTK GNSS module from XYZ-GNSS, you are providing your flight controller with the high-precision, low-latency positioning data it needs to perform at its absolute best, enabling survey-grade mapping and rock-solid autonomous flight.
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Frequently Asked Question
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The main function of an RTK GNSS module is to calculate a device's position with centimeter-level accuracy in real-time. It achieves this by processing its own satellite observations along with correction data received from a nearby, stationary base station. This differential technique allows it to resolve carrier phase ambiguities and cancel out most atmospheric and satellite clock errors.
A standard GPS module can only achieve meter-level accuracy. An RTK GNSS module is far more advanced; it is typically "multi-band" (receiving L1, L2, L5 signals) and contains a powerful processing engine with specialized firmware designed to handle RTK calculations. It must be able to receive and apply correction data (in RTCM format) to achieve its high precision.
A multi-band RTK GNSS module can receive and process signals on multiple frequencies (e.g., L1 and L5) from the same satellites. This is the single most important feature for modern RTK, as it allows the module's algorithms to model and remove the ionospheric delay—the largest source of GNSS error. This results in dramatically faster initialization ("fix") times and more reliable performance.
A "float" solution is an intermediate state where the RTK GNSS module has started processing corrections but has not yet resolved the integer ambiguities, providing decimeter-level accuracy (e.g., 10-30 cm). A "fixed" solution is the goal: the module has solved the ambiguities and is operating at its maximum, centimeter-level accuracy. The quality of the module and its antenna determines how quickly it can achieve a "fix."
Yes, a complete RTK system requires a pair of receivers. You need one RTK GNSS module configured as a stationary "base station" to generate corrections, and another identical or compatible module in your moving device (the "rover") to receive those corrections and calculate the precise position. Alternatively, a single rover can be used if it has a connection to a public CORS/NTRIP correction service.
An RTK GNSS module typically communicates with a host processor (like a microcontroller or computer) via a standard UART serial interface. It outputs its high-precision position data using the NMEA protocol and receives the incoming RTK correction data (RTCM format) through the same interface, which the host system must relay to it from a radio or internet link.