1. Introduction and Overview
The Witmotion WTGPS-02H is a low-power, high-precision Positioning & Orientation GNSS module designed for various applications requiring accurate location and attitude data. This module supports multi-satellite system concurrency, including BDS, GPS, GLONASS, Galileo, and QZSS, ensuring robust and reliable performance.
Key features of the WTGPS-02H include dual-antenna orientation, high sensitivity positioning, and real-time output of 3-dimensional data such as heading angle, pitch angle, and roll angle, facilitated by integrated MEMS sensors. It boasts a horizontal accuracy of 1.5mCEP and a vertical accuracy of 3.5mCEP. The module is engineered with built-in LNA (Low Noise Amplifier) and SAW (Surface Acoustic Wave) filters to enhance sensitivity and anti-interference capabilities, ensuring superior performance even in complex environments.
2. Setup Instructions
Follow these steps to set up your WTGPS-02H module and connect it to your computer for data acquisition.
2.1. Software and Driver Installation
- Download the necessary software and drivers from the official WitMotion support resources. This typically includes the CH3406 CP2102 Driver and the QGNSS V1.8 Software for Windows PC.
- Install the drivers first, then the QGNSS software.
2.2. Antenna Considerations
- If operating the device in an open outdoor environment, an external antenna may not be strictly necessary.
- For indoor use or in environments with weak GPS signals, it is crucial to connect an external antenna. Place the external antenna in an open environment with a clear view of the sky for optimal signal reception.
2.3. Wiring Instructions
Connect the WTGPS-02H module to your Microcontroller Unit (MCU) or USB-to-serial converter according to the following wiring diagram:
- VCC: Connect to the power supply (3.1V-3.6V).
- TX (Transmit): Connect to the RX (Receive) pin of your MCU/converter.
- RX (Receive): Connect to the TX (Transmit) pin of your MCU/converter.
- GND (Ground): Connect to the ground of your power supply/MCU.
2.4. Software Configuration and Connection
- Connect the wired WTGPS-02H device to your computer via the USB-to-serial converter.
- Open the QGNSS V1.8 software.
- Click on the 'Settings' icon (often represented by a gear) in the software interface.
- In the 'Device Information' window:
- For 'Model', type or select 'LC02HBA'.
- For 'Port', select the correct COM port corresponding to your connected device (e.g., COM5 USB-SERIAL CH340).
- For 'Baudrate', select '115200'.
- Click 'OK'. The software should now connect to the device, and you will see data streaming.
3. Operating Instructions
Once the WTGPS-02H module is successfully connected and configured with the QGNSS software, you can begin monitoring and analyzing the positioning and orientation data.
3.1. Viewing Data
- In the QGNSS software, navigate to the 'View' menu.
- Select 'Text Data' to display the raw NMEA sentences output by the module. This provides detailed information about position, velocity, and time.
- Explore other viewing options available in the 'View' menu for comprehensive analysis:
- 'Data Dock': Displays key parameters like Longitude, Latitude, Altitude, Speed, HDOP, PDOP, Fix Mode, etc.
- 'Signal Level': Visualizes the signal strength of detected satellites.
- 'Deviation Map': Shows the module's positioning accuracy and deviation over time.
- 'Sky View': Illustrates the current distribution of visible satellites in the sky.
- 'Online Map': Provides a geographical context for the module's position.
4. Specifications
| Feature | Description |
|---|---|
| GNSS Module | WTGPS-02H |
| Coverage | Worldwide |
| Dimensions (Module) | 25 * 2.6 * 0.6 cm |
| Dimensions (Passive Antenna) | 25 * 25 * 4 mm |
| Dimensions (PCB) | 25 * 26 * 18 mm |
| Weight | 50g |
| Operating Temperature | -40°C ~ +85°C |
| Receiving Temperature | -40°C ~ +90°C |
| Receiving Constellations | BDS: B1, B1C; GPS: L1; GLONASS: G1; Galileo: E1; QZSS: L1 |
| Default Constellation | BDS+GPS+GLONASS+Galileo+QZSS |
| Heading Accuracy | 0.2° (1m baseline) |
| Tilt Angle Accuracy | 0.3° |
| Roll Angle Accuracy | 0.3° |
| Initialization Time | <60s |
| Horizontal Positioning Accuracy | 1.5mCEP |
| Vertical Positioning Accuracy | 3.5mCEP |
| 1 PPS Accuracy | ≤30ns@1σ |
| TTFF@ -130dBm (AGNSS enabled) | Cold start: 12s, Warm start: 2s, Hot start: 1s |
| TTFF@ -130dBm (AGNSS disabled) | Cold start: 26s, Warm start: 18s, Hot start: 1s |
| Sensitivity | Capture: -148dBm, Track: -165dBm, Recapture: -160dBm |
| Dynamic Performance | Altitude: 10000m, Speed: 500m/s, Acceleration: 4g |
| Certification | CE |
| UART Baud Rate | 9600~921600bps (Default: 115200bps) |
| Protocol | NMEA0183, Update frequency: Default 1Hz, up to 10Hz |
| Antenna Type | Active or passive |
| Antenna Power Supply | External power supply or module VDD_RF pin |
| Power Supply Range | 3.1V-3.6V (typical value 3.3V) |
| I/O Voltage | Typical value 2.8V |
| Consumption (@ 3.3V) | Normal mode: 89mA@capture, 89mA@track; Power saving mode: 52uA@Backup mode |
5. Troubleshooting
If you encounter issues with your WTGPS-02H module, refer to the following troubleshooting tips:
5.1. No Data Output
- Check Wiring: Ensure all connections (VCC, TX, RX, GND) are secure and correctly matched between the module and your MCU/converter. Remember to cross-connect TX to RX and RX to TX.
- Power Supply: Verify that the module is receiving power within the specified range of 3.1V-3.6V.
- Driver Installation: Confirm that the CH3406 CP2102 driver is properly installed on your computer.
- Software Settings: Double-check that the correct COM port and Baudrate (115200) are selected in the QGNSS software.
5.2. Poor Positioning Accuracy or Weak Signal
- Antenna Placement: Ensure the antenna (especially if external) has a clear, unobstructed view of the sky. Avoid placing it near large metal objects or sources of strong electromagnetic interference.
- Environment: For optimal performance, operate the module in an open outdoor environment. If indoors, use an external antenna placed outdoors.
- Software Monitoring: Use the 'Signal Level' and 'Sky View' features in the QGNSS software to assess satellite visibility and signal strength.
5.3. Software Connection Issues
- Restart Software/Computer: Try restarting the QGNSS software or your computer.
- COM Port Conflict: Ensure no other applications are using the same COM port.
6. User Tips
- For the quickest initial fix and highest accuracy, always operate the module in an open outdoor environment with a clear, unobstructed view of the sky.
- Before connecting the module to your PC, ensure all necessary drivers are installed to prevent communication errors.
- Utilize the various 'View' options within the QGNSS software, such as 'Signal Level' and 'Sky View', to gain a better understanding of the module's satellite reception and overall performance.
- If you encounter any communication problems, a common solution is to double-check the TX/RX wiring; ensure they are cross-connected (module TX to MCU RX, module RX to MCU TX).
7. Maintenance
Proper maintenance ensures the longevity and optimal performance of your WTGPS-02H module:
- Cleaning: Keep the module clean and free from dust, dirt, and debris. Use a soft, dry cloth for cleaning. Avoid liquid cleaners.
- Environmental Protection: Do not expose the module to extreme temperatures, high humidity, or corrosive environments.
- Handling: Handle the module with care to prevent physical damage to the PCB, connectors, or antennas.
- Ventilation: If integrating the module into an enclosure, ensure adequate ventilation to prevent overheating, which can affect performance and lifespan.
8. Warranty and Support
WitMotion is committed to providing excellent customer service and support for its products.
- Technical Support: The WTGPS-02H module comes with lifetime technical support from WitMotion.
- Contact: For any technical inquiries, troubleshooting assistance, or further documentation, please visit the official WitMotion website or contact their dedicated customer support team.
