Specifications

  • Model: GP-02
  • Dimensions: 10.3 × 9.9 × 2.4 (±0.2) mm
  • Operating Temperature: -40°C to 85°C
  • Storage Environment: -40°C to 125°C, Humidity < 90% RH
  • Power Supply Range: 2.7V ~ 3.6V
  • UART Baud Rate: Supports up to 256,000 bps
  • Certification: RoHS Compliant
  • Supports BDS, GPS, GLONASS, GALILEO, QZSS, SBAS for combined and standalone positioning.
  • Supports D-GNSS (Differential GNSS), A-GNSS (Assisted GNSS), ephemeris prediction, DR (Dead Reckoning) hybrid navigation.
  • Maximum data update rate: 10Hz.
  • 32-bit application processor with a maximum frequency of 133MHz, supporting dynamic frequency scaling.
  • Supports PPS (Pulse Per Second) output.
  • Peripheral Interface: UART.

 

Hardware Connection

Connect the development board to a computer using a USB to TTL serial adapter.

 

Power-on Test

After connecting the GP-02-Kit to the computer via the USB-to-TTL adapter, use the Ai-Thinker Serial Debugging Assistant to receive UART output information.

Default Baud Rate: 9600 bps

 

Output Information

$GNGSA,A,1,,,,,,,,,,,,,25.5,25.5,25.5,4*04

$GPGSV,1,1,00,0*65

$BDGSV,1,1,00,0*74

$GNRMC,,V,,,,,,,,,,N,V*37

$GNVTG,,,,,,,,,N*2E

$GNZDA,,,,,,*56

$GPTXT,01,01,01,ANTENNA OPEN*25

NMEA Sentence Definitions:

 

Sentence

ID

Main Content

GGA

4E 00

UTC time, latitude and longitude, fix quality, HDOP, altitude, number of satellites used.

GLL

4E 01

Latitude and longitude, UTC time, fix status.

GSA

4E 02

PRN numbers of satellites used, PDOP, HDOP, VDOP.

GSV

4E 03

Visible satellites, PRN number, elevation, azimuth, carrier-to-noise ratio.

RMC

4E 04

UTC time, latitude and longitude, status, speed, heading, date.

VTG

4E 05

Speed and course over ground.

ZDA

4E 08

UTC time and date.

GST

4E 07

Pseudorange error RMS, position error in latitude, longitude, and altitude.


Software Testing

  • Download and run GnssToolKit3 software.
  • Open the Serial Port menu from the main toolbar to configure UART settings.

 

Baud Rate Selection: Default is 9600 bps, adjust according to actual receiver settings.

NMEA View

Displays parsed NMEA sentence information in a structured format.

 

Carrier-to-Noise Ratio (C/N0) Bar Graph

Displays satellite signal strength in a bar graph; each bar represents a different satellite.

 

Sky Plot View

In the View menu, select Sky Plot to visualize satellite positions.

 

Note: Testing was conducted indoors, resulting in weaker satellite signals.