Overview

The TOXU TX-M9N is an integrated DroneCAN GNSS module developed for UAV flight controllers and autonomous navigation systems. It combines a u-blox NEO-M9N GNSS receiver, STM32G4 processor, electronic compass, ceramic patch antenna and CAN communication interface in a compact housing.

The u-blox NEO-M9N receiver can concurrently receive GPS, GLONASS, Galileo and BeiDou signals. This multi-constellation capability improves satellite availability and positioning stability in demanding UAV operating environments.

Unlike a conventional UART GPS module, the TX-M9N communicates with the flight controller through the DroneCAN protocol at 1 Mbit/s. CAN bus communication provides reliable differential data transmission, improves resistance to electromagnetic interference and does not occupy a flight controller serial port.

Multiple CAN peripherals can also share the same CAN bus through a suitable CAN splitter or hub. This makes the TX-M9N suitable for UAV systems that require scalable peripheral integration.

The TX-M9N follows the principal hardware and communication configuration of the Holybro DroneCAN M9N GPS, providing system integrators with a cost-effective compatible option for supported Pixhawk, PX4 and ArduPilot platforms. Compatibility should be verified according to the flight controller connector, cable pinout and firmware configuration.

Key Features

u-blox NEO-M9N GNSS Receiver

Integrates the u-blox NEO-M9N receiver for concurrent tracking of up to four major GNSS constellations.

Multi-Constellation GNSS Support

Supports GPS, GLONASS, Galileo and BeiDou signals for improved satellite availability and reliable positioning.

DroneCAN Communication

Communicates with supported flight controllers through the DroneCAN protocol at a default CAN bus data rate of 1 Mbit/s.

STM32G4 Processing Platform

Uses a 170 MHz STM32G4 processor with 512 KB Flash to manage GNSS information, compass data and DroneCAN communication.

Integrated Electronic Compass

Available with a BMM150 or IST8310 electronic compass to provide magnetic heading information to the flight control system.

Improved Communication Reliability

CAN differential communication provides better resistance to electromagnetic interference than a conventional single-ended serial connection.

No UART Port Occupation

The DroneCAN interface allows the GNSS module to operate without occupying a flight controller UART or conventional GPS serial port.

CAN Bus Expansion

Multiple compatible CAN devices can share the same CAN bus through an appropriate CAN splitter board or hub.

Integrated Ceramic Patch Antenna

Includes a 25 × 25 × 4 mm ceramic patch antenna with 1.5 dBi antenna gain and 22 dB LNA gain.

PX4 and ArduPilot Support

Designed for DroneCAN-enabled UAV flight controllers running supported PX4 or ArduPilot firmware.

Software-Controlled CAN Termination

Supports software switching of the CAN termination resistance for flexible CAN bus system integration.

Technical Specifications