> For the complete documentation index, see [llms.txt](https://docs.acrome.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acrome.net/smd-applications/boardoza-sensors/ublox-sam-m8q-gps-board.md).
# Ublox SAM-M8Q GPS Board
### Overview
The Boardoza Ublox SAM-M8Q is a precision-engineered GNSS (Global Navigation Satellite System) solution designed around the industry-leading u-blox SAM-M8Q concurrent positioning engine. This module distinguishes itself with its embedded wide-band patch antenna, which utilizes a specialized "Smart Antenna" architecture to deliver omnidirectional reception and superior gain, even in RF-hostile environments.
Capable of acquiring signals from up to three satellite constellations simultaneously (GPS, GLONASS, and Galileo), the board offers exceptional positioning accuracy and reliability compared to single-constellation receivers. With its dual-interface design (UART and I2C) and wide input voltage compatibility, it serves as a versatile geospatial anchor for avionics, autonomous robotics, and precision asset tracking systems.
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### Core Technical Specifications
The module is defined by the following operational parameters:
* GNSS Engine: 72-channel u-blox M8 architecture supporting concurrent reception of GPS, GLONASS, and Galileo.
* Antenna Topology: Integrated wide-band patch antenna with an omnidirectional radiation pattern, eliminating the need for external RF circuitry.
* Update Rate: Supports up to 18 Hz in single-GNSS mode and 10 Hz when using concurrent GNSS, enabling high-dynamic tracking.
* Sensitivity: Achieves a tracking sensitivity of -165 dBm and a cold-start acquisition sensitivity of -146 dBm.
* Supply Voltage: engineered for flexibility with a simplified input range of 3.3V to 5.5V DC.
* Communication Interfaces: Features both UART (TTL) and I2C buses for broad microcontroller compatibility.
* Time Pulse Accuracy: Provides a highly precise PPS (Pulse Per Second) signal with ±30ns RMS accuracy for system time synchronization.
* Physical Dimensions: A standardized 40 mm x 40 mm footprint with mounting holes for secure chassis integration.
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### Key Engineering Features
#### Concurrent Multi-GNSS Reception
Unlike legacy GPS-only modules, the SAM-M8Q leverages concurrent processing to track multiple constellations simultaneously. This "Multi-GNSS" capability significantly increases the number of visible satellites, improving position lock stability in "urban canyons" or obstructed horizons where a single constellation might fail.
#### RF Interference Mitigation
The module integrates a high-performance SAW (Surface Acoustic Wave) filter and a low-noise amplifier (LNA) directly in the RF front-end. This architecture provides exceptional immunity against jamming and RF noise from collocated peripherals like cellular modems or motor drivers, ensuring data integrity in complex electromechanical systems.
#### Embedded Smart Antenna
The onboard patch antenna is tuned for optimal performance independent of the ground plane size. This "design-in" readiness reduces the complexity of RF impedance matching during the integration phase, allowing engineers to treat the GPS subsystem as a "black box" component.
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### Hardware Interface and Signal Mapping
The board provides access to power and data lines via standard 2.54mm pitch headers, organized into logical groups:
Communication Interfaces
* VCC: Main power supply input (3.3V - 5.5V).
* GND: Common system ground.
* TXD: UART Transmit line (Outputs NMEA stream to MCU).
* RXD: UART Receive line (Inputs configuration commands from MCU).
* SDA: I2C Serial Data line for bus-based communication.
* SCL: I2C Serial Clock line.
System Control Pins
* PPS: Pulse Per Second output. Delivers a high-precision logic pulse synchronized to atomic GPS time, essential for data logging timestamps.
* RST: Active-low hardware reset pin. Used to externally reboot the GNSS engine.
* INT: External Interrupt input. Can be used to wake the module from power-save modes or for time-aiding injection.
* SAFE: Reserved pin for SAFEBOOT\_N functionality, used during firmware updates or recovery procedures.
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### Applications
* Unmanned Aerial Vehicles (UAVs): Provides stable positioning and "Return-to-Home" coordinates for drones.
* Precision Agriculture: Enables geofenced autonomous steering for robotic farming equipment.
* Fleet Telematics: Tracks vehicle location, speed, and heading for logistics management.
* High-Altitude Ballooning: capable of operating at high altitudes (up to 50,000m depending on flight mode configuration).
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### Board Dimensions:
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Ready to integrate? You can purchase the **Ublox SAM-M8Q GPS Board** directly from our [Online Store](https://www.robotshop.com/products/acrome-ublox-sam-m8q-gps-breakout-board?qd=4dc3ec081aa1beb58bb46b427d70b5ce). Worldwide shipping is available for engineering samples and production batches.
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