The Ublox NEO-M8N is a professional-grade concurrent GNSS module that offers exceptional sensitivity and rapid acquisition times. Unlike older single-system receivers, the M8N can track multiple satellite constellations simultaneously, including GPS, GLONASS, Galileo, and BeiDou. This multi-constellation support significantly improves positioning accuracy and helps maintain a signal lock in challenging environments like "urban canyons" or under dense foliage.

Specifications

• Model: NEO-M8N
• GNSS Support: GPS, GLONASS, Galileo, BeiDou, and QZSS
• Power Supply: 5V DC
• Accuracy (Horizontal):
  • GPS: 2.5m
  • GLONASS: 4m
  • BeiDou: 3m
  • Galileo: 3m
• Interface: UART (Serial)
• Default Baud Rate: 9600 bps
• Antenna Support: Compatible with both Passive and Active antennas
• Connector: Small SMA (Female)

Features

• Concurrent Multi-GNSS: Receives signals from up to three constellations at the same time, providing a much higher number of visible satellites for a more stable and precise position fix.
• High Sensitivity: Features a tracking sensitivity of -167dBm, allowing it to maintain a lock even in low-signal areas where standard modules fail.
• Professional Grade Receiver: Optimized for high-performance applications requiring high update rates and low power consumption.
• SMA Connector: Features a rugged, threaded SMA port for a secure connection to external high-gain antennas, essential for outdoor or vehicle-mounted use.
• EEPROM and Battery: Includes onboard storage and a backup battery to save configuration settings and satellite orbital data (Ephemeris), enabling near-instant "Hot Starts."
• Status LED: Equipped with a "PPS" (Pulse Per Second) LED that blinks once a successful satellite lock has been achieved.

Pin Configuration

• VCC: 5V Power Input.
• GND: Ground.
• TX: Transmit Data (connect to MCU RX).
• RX: Receive Data (connect to MCU TX).

Common Applications

• Drones and UAVs: High-reliability positioning for flight controllers like Pixhawk, ArduPilot, or INAV.
• Vehicle Tracking: Fleet management and security systems where external antennas are mounted outside the vehicle body.
• Precision Timing: Using the PPS signal to synchronize network clocks or distributed sensor systems.
• Autonomous Navigation: Providing coordinates for outdoor robots, rovers, and mapping equipment.

Usage Tips

• Antenna Placement: For best results, the connected antenna should have a clear, unobstructed view of the sky. Metal enclosures will block the signal, while plastic or glass are generally transparent.
• First Fix: A "Cold Start" (first time powering on or after a long period) can take 30 to 60 seconds. Ensure you are outdoors for the initial lock.
• Logic Levels: While the module is powered by 5V, the UART communication pins (TX/RX) usually operate at 3.3V logic. They are typically 5V tolerant, but a level shifter is recommended for maximum reliability with 5V microcontrollers.