WitMotion WTGPS+BD Multi-GNSS NMEA0183 Positioning Module (AT6558) with Antenna Options for Arduino/FC
WitMotion WTGPS+BD Multi-GNSS NMEA0183 Positioning Module (AT6558) with Antenna Options for Arduino/FC
WitMotion
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Overview
The WitMotion WTGPS+BD is a multi-system GNSS positioning module designed for Arduino projects and flight control/robotics integrations using serial (TTL) data output. It supports combined satellite reception (BDS/GPS/GLONASS and more) and is offered with different antenna selections, including external and ceramic antenna options, plus an optional WTGPS-M RS485/MODBUS version for industrial-style communications.
Key Features
- GNSSSoC: ZhongKeWei AT6558 (4-generation low-power GNSSSoC chip; “6-in-1 multi-mode satellite navigation chip”)
- Multi-system support: BDS, GPS, GLONASS, GALILEO, QZSS, SBAS
- 32 channels
- Positioning precision: <2.5 m (CEP50)
- Tracking sensitivity: -162 dBm
- Type-C interface (plug and play) and reserved serial connection
- Built-in IPX interface for connecting external active antennas
- Antenna performance notes: less than 1.65 VSWR; built-in antenna detection circuit; π-type network impedance antenna (50Ω)
- Farad capacitance power storage: save data for 60 s after power off
Specifications
| Signal reception | BDS, GPS, GLONASS, GALILEO, QZSS, SBAS |
| RF channel number | 3-channel radio frequency; receive BDS, GPS & GLONASS simultaneously |
| Channels | 32 |
| Precision | <2.5 m (CEP50) |
| Cold start TTFF | ≤32 s |
| Hot start TTFF | ≤1 s |
| Recapture TTFF | ≤1 s |
| Capture time sensitivity | Cold-start -148 dBm; Hot-start -156 dBm |
| Recapture sensitivity | -160 dBm |
| Tracking sensitivity | -162 dBm |
| Antenna VSWR | Less than 1.65 |
| Antenna impedance | 50Ω |
| Module dimensions | 30 mm (height); 25.7 mm (width); 38 mm (overall height shown); 4.9 mm (thickness); 20 mm and 3 mm dimensions shown on drawing |
Pin Definition (WTGPS+BD board)
| VCC | The power supply must be connected to 3.3V-5V |
| RXD | Serial data input, TTL |
| TXD | Serial data output, TTL |
| GND | Ground wire |
Board silkscreen indicates the serial header order as: GND / TXD / RXD / VCC.
Antenna Options
- External Antenna: 3-meter wire; 27 dB high-gain omnidirectional active antenna; wider working coverage; built-in magnet.
- Ceramic Antenna: highly integrated design intended to ensure equipment operation (no further numeric parameters provided).
WTGPS-M (RS485/MODBUS version)
- RS485 interface, MODBUS protocol output (industrial communication standard-oriented)
- Wiring note: A to A, B to B
- Aluminum shell; IP68 waterproof/dustproof; shockproof; suitable for harsh environments
- Shielded cable designed for stable signal transmission (wording in source notes interference resistance)
- Receives external signals to enhance signal strength
WTGPS-M Wire/Pin Definition
| Red | VCC | Power Supply (+5V~+36V) |
| Yellow | A | RS485 A |
| Green | B | RS485 B |
| Black | GND | Ground Cable |
Applications
- Vehicle navigation
- Handheld positioning
- Wearable devices
- Replacing Ublox NEO series modules (as stated in source material)
For wiring/selection support (TTL vs RS485, and antenna choice), contact support@rcdrone.top or visit https://rcdrone.top/.
Details
WitMotion WTGPS+BD is a compact GNSS module for Arduino, robotics, and flight-control builds using TTL serial data output.
Plug-and-play Type‑C plus an IPX connector supports either the onboard antenna option or an external active antenna.
Pin labels are provided for quick wiring: VCC (3.3–5V), RXD, TXD, and GND on the TTL serial header.
Choose the external antenna kit when you need wider placement flexibility for stronger reception.
The ceramic antenna option keeps the build highly integrated for space-constrained enclosures.
An optional WTGPS‑M variant provides RS485 with MODBUS output for industrial-style communication runs.
A sealed aluminum housing and shielded cable are designed for harsher environments and more stable signal transmission.
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