ArduSimple simpleRTK3B Budget GPS Module

ArduSimple simpleRTK3B Budget is an affordable triple-band centimeter RTK GNSS receiver based on the Unicorecomm UM980 module, designed for beginners and professionals. This module is suitable for integration into projects on Arduino, Raspberry Pi, Nvidia Jetson Nano, and STM32 Nucleo platforms as a shield, allowing for high-precision positioning at a relatively low cost and ease of use.

Key Features

• Frequency Support: L1, L2, L5 (triple-band)
• Number of Channels: 1408 search and tracking channels
• Accuracy: up to 10 mm with a base station or via NTRIP up to 35 km; autonomous accuracy < 1.2 m; with SBAS < 0.9 m; with Galileo HAS < 0.4 m (Galileo HAS is currently under testing and not guaranteed)
• Update Rate: up to 50 Hz
• Operating Modes: base or rover

Connectivity and Interfaces

• Onboard Interfaces: USB-C, UART, Pixhawk connector, XBee connector
• Special Pins: Timepulse (output) and Event Input (input) for synchronization and event triggering
• Additional Interfaces (via accessories): radio (RF), Bluetooth, WiFi, BL+BLE, 4G modem, RS232, Ethernet, CANBus, MicroSD
• Antenna Connector: SMA RF
• Ardupilot Compatible via standard JST-GH connector

Supported Constellations and Frequencies

• GPS: L1C/A, L1PY, L2C, L2PY, L5
• GLONASS: L1CA, L2CA, L2P, L3 CDMA
• Galileo: E1, E5a, E5b, E5, E6 HAS
• BeiDou: B1I, B1C, B2a, B2b, B2I, B3I
• QZSS: L1C/A, L2C, L5
• NavIC: L5
• SBAS: WAAS, EGNOS, MSAS, GAGAN, SDCM (L1)

Protocols and Software Compatibility

• Protocols: Unicore ASCII Format, NMEA 0183 (v3.1, v4.1), RTCM v3 (subset)
• Raw GNSS Measurements and RINEX Support: available via free PC software
• Quick Starts (typical): cold start < 35 s, warm start < 10 s, reacquisition 1 s
• No advanced settings available in the firmware

Physical and Electrical Parameters

• Weight: 31 g
• Mounting: 3 mounting holes
• Power Supply Voltage Range: 4.5–5.5 V
• Typical Current Consumption: 200 mA @ 5 V
• Antenna Voltage: 3.3 V
• Plastic Enclosure: available as an accessory
• 3D CAD STEP file: available for download

Operating Conditions and Certifications

• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -40°C to +85°C
• Certifications: CE, RED, RoHS

Documentation and Package Contents

• Documents: user manual, 3D model, footprint, RED and RoHS certificates
• Important to Know: antenna not included — a multi-frequency GNSS antenna is required for operation; radio module for base communication is also not included
• Compatibility with Ardusimple Accessories: XBee socket supports connection of 4G modem, MR/LR/XLR radio, Bluetooth, WiFi, Ethernet, dataloggers, RS232

Additional Information

• The module is ideal for testing Unicore Communications UM980 performance and for applications requiring high accuracy without significant cost.
• Please note: a printing issue has been identified in production — "TX2" and "RX2" markings are not visible; this will be corrected in the next batch. We apologize for the temporary inconvenience.

The simpleRTK3B Budget is a compact and versatile solution for implementing centimeter-level RTK positioning in your projects: from drones and robotics to surveying and research systems. With support for multiple constellations, a high number of channels, and a wide range of interfaces, this module allows for flexible construction of positioning systems tailored to your tasks and budget.

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