4G GNSS-RTK High Precision Positioning Kit (EMEA & Thailand, GPS / GLONASS / Galileo / BDS / QZSS)

Description: 

The 4G GNSS-RTK High Precision Positioning Kit delivers centimeter-level accuracy (5cm + 1ppm) across a 15-20km operational range without requiring a local base station. This Network RTK solution uses 4G connectivity to access CORS correction networks via Ntrip protocol, eliminating traditional base station complexity and cost.The multi-constellation receiver tracks GPS, GLONASS, Galileo, BDS, and QZSS simultaneously across multiple frequency bands (L1/L5, E1/E5a, B1l/B2a), ensuring rapid convergence in under 10 seconds and reliable performance in challenging environments. Its dual I2C/UART Gravity interface enables seamless integration with microcontrollers and single-board computers for autonomous vehicles, precision asset tracking, land surveying, and outdoor robotics applications.Key specifications include 1Hz RTK update rate, 20ns 1PPS accuracy, and support for NMEA 0183 and RTCM 3.x protocols. The kit includes RTK Mobile unit, GNSS antenna, 4G/LTE antenna, connection cables, and accessories. Designed for EMEA and Thailand regions. Requires active CORS subscription and 4G signal for optimal performance.

Figure: Positioning Flowchart

Wide-Area Network RTK Coverage

This GNSS-RTK positioning kit moves beyond the limitations of traditional RTK. Instead of relying on a local base station with a 3-5km radio link, it connects to an established CORS network via 4G. This Network RTK methodology provides a vastly expanded operational area, offering uniform and reliable centimeter-level accuracy across a typical radius of 15-20km, provided an active CORS subscription and 4G signal are available.

Robust Multi-Constellation & Multi-Band Reception

To ensure high reliability and fast convergence times, the positioning module tracks multiple satellite systems concurrently. It supports GPS, GLONASS, Galileo, BDS, and QZSS. Furthermore, its ability to receive signals on multiple frequency bands (including GPS L1/L5, Galileo E1/E5a, and BDS B1l/B2a) significantly mitigates ionospheric interference and multipath effects, resulting in a more stable and precise position lock in complex environments.

Simplified Deployment and Integration

A primary benefit of this 4G kit is the streamlined setup. It removes the significant cost and logistical complexity of purchasing, placing, and maintaining a physical base station. Deployment is simplified to inserting a 4G SIM card and configuring the device with CORS account credentials. For project integration, the Gravity interface offers selectable I2C and UART signal outputs, ensuring seamless connectivity with popular microcontrollers and single-board computers.

Figure: Wiring Diagram of GNSS-RTK positioning kit

Figure: Differences Between Traditional RTK and Network RTK Positioning

Usage Notes

• Outdoor use: environments like under tree shade, bridges, and areas with strong electromagnetic interference can affect positioning accuracy. For optimal accuracy, try to stay away from such areas during use.
• The 4G module requires a separate power supply via the Type-C interface. If not separately powered, the 4G module might initialize abnormally, preventing RTK positioning.
• As the 4G module initialization takes some time, it is recommended to power the 4G module first.
• Before purchasing a CORS account, please check the account's coverage area to ensure your location is covered. Otherwise, RTK positioning will fail due to lack of CORS coverage in the current area.

Applications:

• Autonomous Rover: Build a rover, autonomous lawnmower, or delivery bot that navigates with pinpoint precision.
• Asset Tracking: Create a high-precision tracker for fleet vehicles, expensive equipment, or even a lost drone.
• Data Logging: Map a precise trajectory, conduct simple land surveys, or create a set of fixed monitoring points for science projects.
• Outdoor Robotics: Give any outdoor robot a reliable, centimeter-level understanding of its position in the world..

Specification:

• Power Interface: Gravity interface, 3.3~5V
• Type-C: For 4G module power (requires separate power supply)
• Output Signal: I2C / UART
• Antenna Interface: SMA
• Reception Bands:
         GPS/QZSS: L1 C/A, L5
         GLONASS: L1
         Galileo: E1, E5a
         BDS (BeiDou): B1l, B2a
• Default Constellations: GPS + GLONASS + Galileo + BDS + QZSS
• Concurrent Tracking Constellations: 4+ QGNSS
• SBAS: WAAS, EGNOS, MSAS, GAGAN
• Function: RTK
• Horizontal Positioning Accuracy:
         Autonomous: 1 m
         RTK: 5 cm + 1 ppm
• Velocity Accuracy: 0.03 m/s
• 1PPS Accuracy: 20 ns
• RTK Convergence Time: < 10 s
• Sensitivity:
         Acquisition: -145 dBm
         Tracking: -165 dBm
         Reacquisition: -157 dBm
• Dynamic Performance:
         Max Altitude: 10000 m
         Max Velocity: 500 m/s
         Max Acceleration: 4 g
• Navigation Update Rate (RTK): 1 Hz
• Raw Data Output Rate (GNSS): 1 Hz
• Protocol: NMEA 0183 / RTCM 3.x
• Weight: about 380g
• Supported Countries/Regions: EMEA & Thailand 

  Documents:

• Product wiki

Product Includes:

• RTK Mobile ×1
• GNSS Antenna ×1
• 4G/LTE Right-Angle Rubber Duck Antenna (Internal Pin, 3dBi) ×1
• Flathead Screwdriver ×1
• Plug-in Terminal Block DB2EK-3.81-2P-GN-S (Female) ×1
• PH2.0-4P Connection Cable (30cm) ×1