The Unit GPS SMA is a compact GNSS global positioning and navigation unit using the ATGM336H navigation module and AT6668 chipset. With an active external SMA antenna, the Unit GPS SMA provides reliable satellite positioning for embedded devices that need accurate location data.

Compared with earlier GPS units, the Unit GPS SMA supports multi-frequency and multi-system GNSS reception. It can receive GPS/QZSS, BD2, BD3, GLONASS, GALILEO, and QZSS signals, supporting either multi-system joint positioning or single-system positioning with stronger anti-interference performance in weak-signal areas.

Features

Unit GPS SMA design with ATGM336H navigation module and AT6668 chipset.
Supports GPS/QZSS, BD2, BD3, GALILEO, and GLONASS satellite systems.
Multi-frequency and multi-system reception with 50 channels.
External active SMA antenna for more stable signal reception.
Positioning accuracy under 1.5m (CEP50) and update rate up to 10Hz.
UART communication at default 115200bps@8N1 with NMEA0183 4.1 protocol.
Two LEGO-compatible holes and Grove PORT.C connection for M5Stack projects.
Development support for Arduino, UIFlow, ESP-IDF, and related embedded workflows.

Specifications

Type	GNSS global positioning and navigation unit with active external antenna
GNSS chipset	AT6668
Navigation module	ATGM336H
Supported satellite systems	GPS/QZSS/BD2/BD3/GAL/GLO
Frequency bands	BDS B1I+B1C; GPS/QZSS/SBAS L1; GALILEO E1; GLONASS R1
Channels	50 channels
Communication	UART communication, default 115200bps@8N1
Positioning accuracy	<1.5m (CEP50)
Positioning update rate	Up to 10Hz
Protocol	NMEA0183 4.1
Sensitivity	Tracking -162dBm; acquisition -160dBm; cold start -148dBm
Start time	Cold start 23 seconds; hot start 1 second
Antenna	SMA active external antenna, 30DBI gain, 1555MHz ~ 1580MHz, 1m cable, 38 x 36 x 13mm
Power consumption	Standby DC 5V/31.64mA; operating DC 5V/40.90mA
Pin map	HY2.0-4P: GND, 5V, UART_RX, UART_TX
Item dimensions	71.4 x 24.0 x 8.0mm
Item weight	11.4g
Package size	170.0 x 120.0 x 9.0mm
Gross weight	55.1g

Applications

Vehicle positioning and navigation systems.
Wearable devices that need compact GNSS location data.
IoT positioning devices and remote tracking equipment.
Drones and portable devices using the Unit GPS SMA for satellite positioning.
Bus stop announcement systems and other location-aware projects.

Product List

1 x Unit GPS SMA
1 x HY2.0-4P Grove cable (20cm)
1 x Active external antenna

Resources

GNSS Unit Product Documentation

GNSS Unit PDF Documentation

GNSS Unit Schematics Image

GNSS Unit Model Size Image

ATGM336H-6N Datasheet

MAX2659 GNSS Low-Noise Amplifier Datasheet

CASIC Multi-mode Satellite Navigation Receiver Protocol Specification PDF

TinyGPSPlus Arduino Library

FAQ

Which satellite systems are supported?

The Unit GPS SMA supports GPS/QZSS, BD2, BD3, GALILEO, and GLONASS positioning systems.

What antenna is included?

The package includes an active external SMA antenna with a 1m cable.

What interface does it use?

The unit uses UART communication through Grove PORT.C, with a default baud rate of 115200bps@8N1.

SKU:US31208685 Category: electronic components

Description