WitMotion WTGPS-BD Multi-GNSS Module, GPS+BeiDou with GLONASS/GALILEO/QZSS/SBAS, Type-C & TTL, IPX Antenna, High Sensitivity -162 dBm, Arduino-Friendly

Overview

WTGPS-BD is a compact dual-system positioning module that combines GPS + BeiDou with multi-constellation reception (GLONASS/GALILEO/QZSS/SBAS). It uses the ZhongKeWei AT6558 low-power GNSS SoC and supports 32 channels with high tracking sensitivity (-162 dBm) and CEP50 < 2.5 m. A Type-C port provides plug-and-play data access, while an IPX antenna connector lets you use an external active antenna for stronger signals. The PCB also reserves a TTL serial interface, and an onboard energy-storage capacitor preserves data briefly after power-off. Typical uses include vehicle navigation, handheld positioning, and wearables.

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Key Features

• Multi-GNSS reception: BDS, GPS, GLONASS, GALILEO, QZSS, SBAS

• Chipset: 4th-generation low-power GNSS SoC AT6558

• Sensitivity: tracking -162 dBm; recapture -160 dBm

• Start times: cold start ≤ 32 s; hot start ≤ 1 s; recapture ≤ 1 s

• Capture level: cold-start -148 dBm, hot-start -156 dBm

• Antenna system: π-type 50 Ω network; VSWR < 1.65 (example ~1:1.6073), return loss ~-12.644 dB

• Interfaces:

  • USB Type-C (plug & play to PC)

  • IPX connector for external active antennas

  • Reserved TTL serial header (3.3–5 V supply)

• Antenna options: external 27 dB high-gain active antenna (magnetic base) or ceramic patch antenna

• Advantages: high sensitivity, low power consumption, low cost

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Specifications

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Dimensions

• PCB size: 38 mm × 25.7 mm × 4.9 mm

• Mounting-hole spacing (center-to-center): 20 mm (W) × 30 mm (H)

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Pin Definition (TTL Header)

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External Antenna Options

• 27 dB high-gain omnidirectional active antenna, ~3 m cable, magnetic base (via IPX adapter)

• Ceramic patch antenna option for integrated installations

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Industrial RS485 Variant — WTGPS-M

For industrial buses, the WTGPS-M variant outputs via RS485 (MODBUS-style) in an IP68 aluminum enclosure with shielded cable.

Wiring (WTGPS-M):

• Red – VCC: +5 V ~ +36 V

• Yellow – A: RS485 A

• Green – B: RS485 B

• Black – GND: Ground

Enclosure highlights: IP68 waterproof/dustproof/shock-resistant aluminum shell; shielded cable for anti-interference.

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Benefits vs. Typical Modules

• GPS + BeiDou (not GPS-only)

• USB Type-C plug-and-play (no manual serial setup needed)

• Proper 50 Ω, π-network antenna matching

• Fast cold start (~32 s) vs. ~3 min on basic modules

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Applications

Vehicle/asset tracking, handheld data collectors, wearables, robotics and flight-control integration (via TTL/USB), Arduino-based positioning projects, and general GNSS evaluation.

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What’s Included (board version)

• WTGPS-BD GNSS module (PCB with Type-C & IPX)

• 4-pin TTL header (as pictured)

Documentation & tools available: Software, Manual, Datasheet, Protocol.

Details

GPS+BEIDOU dual positioning module with <2.5m precision and -162dBm sensitivity. Features 4-gen low-power GNSSOC chip, supports BDS, GPS, BEIDOU, GLONASS, GALILEO, QZSS, SBAS. Ideal for vehicle navigation, handheld devices, wearables.

High sensitivity 32 channels, supports BDS/GPS/GLONASS, multi-system navigation federation.

WitMotion WTGPS offers satellite search with low VSWR, built-in antenna detection, and π-type impedance. It displays GPS data like location, time, signal strength, and satellite status.

Antenna impedance performance graph displaying network analyzer, VSWR, return loss, and Smith chart data. Key metrics include VSWR of 1:1.6073, return loss of -12.644 dB, and frequency range from 500 MHz to 800 MHz.

WitMotion offers GPS+BEIDOU, USB plug & play, π-type antenna impedance, and 32s cold start vs others' limitations.

WitMotion WTGPS module includes IPX interface, Type-C port, Farah capacitance, AT6558 chip for GPS/Beidou, and serial connection.

WitMotion WTGPS supports BDS, GPS, GLONASS, GALILEO, QZSS, SBAS. 3-channel RF, ≤32s cold start, ≤1s hot start, -162dBm tracking sensitivity. Dimensions: 38×30×4.9mm. Pins: VCC, RXD, TXD, GND.

WitMotion WTGPS offers strong signal reception with external and ceramic antennas. Supports RS485 MODBUS protocol, works with multiple devices. Comes with 3-meter wire, high-gain antenna, built-in magnet, and industrial-grade connectivity.

WitMotion WTGPS-M has an aluminum shell, IP68 protection, and shielded cable. Includes software, manual, datasheet, and protocol for inertial navigation.