GP-02-Kit's Introduction and Test

Product Overview

The GP-02-Kit is a compact development board integrating a ceramic antenna and the AT6558R BDS/GNSS multi-mode satellite navigation SoC. It combines an RF front end, digital baseband processor, 32-bit RISC CPU, power management, and active antenna protection, supporting BDS, GPS, and GLONASS systems for multi-mode positioning. Communication is handled via UART using the NMEA protocol.

For more information, refer to: GPS Module Series | Ai-Thinker Technology

Module Appearance

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

Features

• 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.

Schematics

Module Schematic Diagram

Development Board Schematic Diagram

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:

Software Testing

1. Downloadand run GnssToolKit3 software.

2. 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.