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GNSS module


Micro gps chip Car Vehicle navigation system GNSS +DR module

SKG121D is a single receiver module integrating GPS, BeiDou, GLONASS and Galileo systems. It is able to achieve the industry’s highest level of sensitivity, accuracy and TTFF with the lowest power consumption in a small-footprint lead-free package. The embedded flash memory provides capacity for storing user-specific configurations and allows for future updates.

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high sensitivity -162dBm
Style Vehicle navigation system
Chip solution MT3339

The SKG121D module supports multiple positioning and navigation systems including autonomous GPS, BeiDou, GLONASS, Galileo, SBAS (including WAAS, EGNOS, MSAS and GAGAN), QZSS, DGPS,and AGPS.

The SKG121D module supports Dead Reckoning (DR) function, and it is embedded with a 3-axis Gyroscope and 3-axis Accelerometer. Dead Reckoning (DR) is the process of estimating the module current position based upon a previously determined position or “fix”, and estimating that position based upon course and speed. The SKG121D module provides the user with accurate estimates of a vehicle’s position and speed, even during interruptions in GNSS information, combining the best features of GNSS and Sensor navigation.

SKG121D module is an SMD type module with a compact 12.2mm ×16.2mm ×2.3mm form factor. It can be embedded in customers’ applications through the 24-pin pads with 1.1mm pitch. It provides necessary hardware interfaces for connection with the main PCB.

The module is fully compliant with EU RoHS directive.



Ultra high sensitivity: -162dBm

Extremely fast TTFF at low signal level

Supports Dead Reckoning (DR) function

±25ns high accuracy time pulse (1PPS)


Embedded with a 3-axis Gyroscope and 3-axis Accelerometer

UART0: Supports baud rates from 4800bps to 115200bps; 115200bps by default

UART0 port is used for NMEA output and firmware upgrade

Small form factor: 16.2 x 12.2 x 2.4mm

FCC compliance

RoHS compliance (Lead-free)

CE certificated

Parameter Specification
Receiver Type GPS L1 C/A (1575.42MHz)

BeiDou B1 C/A (1561.098MHz)

GLONASS L1 C/A (1602.5625MHz)

Galileo E1 C/A (1575.42MHz)

Sensitivity Tracking



-163dBm Typical

-156dBm Typical

-147dBm Typical

Accuracy Position


Timing (PPS)

<1.8m CEP* @-130dBm

0.1m/s without SA

25ns RMS

Acquisition Time Cold Start

Warm Start

Hot Start


<32s(Typical Open Sky)




Assisted GPS support Support
Power Consumption Tracking




Navigation Data Update Rate Max 10Hz Default 1Hz


LBS (Location Based Service)

PND (Portable Navigation Device)

Vehicle navigation system

Mobile phone

Main chip pass AEC-Q100 certification

IATF16949 quality control system