1. Introduction
The WitMotion WTGPS-300P is a high-precision Inertial Navigation System (INS) positioning module designed to provide accurate location data even in challenging environments where traditional GPS signals may be weak or unavailable. This module integrates satellite positioning (GPS/GNSS/BDS/GLONASS) with inertial navigation technology, utilizing an ultra-low noise GPS-IMU for robust performance. It is capable of sub-meter navigation and features an adaptive Kalman filter algorithm for enhanced accuracy.
Figure 1: WitMotion WTGPS-300P Module Overview
2. Key Features
- High-Precision INS: Integrates satellite positioning and inertial navigation to overcome poor satellite signal conditions and inaccurate positioning.
- Sub-meter Navigation: Supports RTCM2.3 protocol for sub-meter navigation capabilities.
- Multi-System Support: Compatible with GPS, GNSS, BDS, and GLONASS BeiDou receivers, supporting multi-system federation in any combination.
- Advanced Algorithms: Features an adaptive Kalman Filter algorithm and velocity filtering to reduce vibration acceleration and obtain precise velocity data.
- Intelligent Identification: Identifies and isolates erroneous GNSS data for improved reliability.
- Robust Design: Includes a built-in antenna detection circuit, antenna overcurrent protection, front SAW, external LNA, and a 3D sensor.
- Flexible Installation: No specific installation angle requirements, making it convenient for various applications, including vehicle installation.
- Driving Behavior Analysis: Provides high-precision vehicle attitude, acceleration, and angular velocity for accurate driving behavior analysis (UBI), detecting rapid acceleration, deceleration, sudden lane changes, sharp turns, vehicle rollovers, abnormal attitudes, and collisions.
Figure 2: WTGPS-300P Module Feature Highlights
3. Hardware Analysis and Components
The WTGPS-300P module is designed for ease of use and adaptability, featuring several key hardware components:
- IPX Interface: Supports connection to various external active antennas, offering strong adaptability.
- Type-C Interface: Provides plug-and-play connectivity, making it easy to connect to a PC for data review and configuration.
- Farah Capacitance: Integrated for power storage, allowing the module to save data for up to 60 seconds after power-off.
- GPS-IMU: Receives GPS signals and fuses them with an integrated navigation algorithm for precise positioning.
- Serial Connection: A reserved serial port is available on the module for advanced connectivity.
Figure 3: WTGPS-300P Hardware Components
Antenna Options
The module offers flexibility with antenna connections:
- External GPS Antenna: Features a built-in magnet, strong signal reception, and a high-stability 27dB high-gain omnidirectional active antenna for wider working coverage and easy absorption.
- Ceramic Antenna: Reduces network risk and offers robust rigidity with excellent mechanical properties for a longer lifetime. Highly integrated for ensured equipment operation.
Figure 4: WTGPS-300P with External GPS Antenna
Figure 5: WTGPS-300P with Ceramic Antenna
4. Specifications
| Parameter | Value |
|---|---|
| Type | Acceleration Sensor |
| Output | Digital Sensor |
| Use | Tilt Angle Measurement |
| Name | WTGPS-300 Module |
| Supply Voltage | 3.3V |
| Working Current | <25mA |
| Protocol | NMEA0183 |
| Update Rate | 5Hz |
| Size | 25.7*36*4.5mm |
| Interface | Type-C, H2.54x4Pin |
| Receiver | GPS/GNSS/BDS/GLONAS |
| System | QZSS/SBAS |
| Timing Precision | SBAS: 1.0m, RMS: 30ns |
| Positioning Precision | 3% (CEP) UDR GPS+INS, 3% (CEP) ADR GPS+INS+SPEED, Autonomous positioning: 1m |
| Speed Precision | 99%: 60ns |
| Heading Precision | 0.05m/s |
| Operating Limit | 0.3 degrees, Dynamic <= 4g, Height <= 50,000m, Velocity <= 500m/s |
| Working Temperature | -30°C to 85°C |
| Storage Temperature | -40°C to 125°C |
| Installation | Fixed installation before power-on, no movement during power-on |
Figure 6: WTGPS-300P Technical Parameters
Figure 7: WTGPS-300P Module Dimensions
5. Setup and Installation
The WTGPS-300P module is designed for straightforward installation with minimal restrictions.
5.1 Physical Installation
- No Mounting Restrictions: The module can be installed in any posture and orientation. This flexibility makes it suitable for various applications, including vehicle integration.
- Secure Placement: Ensure the module is fixed securely before powering it on. Avoid any movement of the module during operation to maintain optimal performance.
- Antenna Connection: Connect your chosen external antenna (GPS or Ceramic) to the IPX interface on the module.
5.2 Software Setup
- Connect to PC: Use a Type-C cable to connect the WTGPS-300P module to your computer.
- Install Software: Download and install the official WitMotion software from their website. This software is essential for data review, configuration, and secondary development.
- Driver Installation: Ensure any necessary drivers for the Type-C interface are installed on your PC for proper communication with the module.
Video 1: Demonstration of WTGPS-300P connected to PC software, showing real-time navigation data and its ability to maintain positioning in tunnels and underground parking.
6. Operating Instructions
Once the module is physically installed and connected to your PC with the software running, you can begin operating the WTGPS-300P.
- Data Monitoring: Use the WitMotion software to monitor real-time data such as GPS altitude, position positioning accuracy, number of satellites, GPS heading, ground speed, vehicle pitch angle, vehicle roll angle, and collision factor.
- Integrated Navigation: The module autonomously switches between integrated navigation and pure inertial navigation technology, ensuring continuous and precise positioning even when satellite signals are weak or lost (e.g., in tunnels or underground parking lots).
- Multi-System Federation: The module supports multiple satellite systems (BDS/GPS/GLONASS) for enhanced signal acquisition and accuracy.
- Driving Behavior Analysis: The integrated navigation system provides data for analyzing driving behavior, including rapid acceleration, deceleration, sudden lane changes, sharp turns, vehicle rollovers, abnormal attitudes, and collisions.
Figure 10: Driving Behavior Analysis Algorithm Flow
Figure 11: Combined Multiple Systems Support
7. Application Field
The WTGPS-300P module excels in environments where ordinary satellite navigation struggles due to complex conditions like tunnels, parking garages, and urban canyons (buildings, tree blocking signals). Its robust inertial navigation capabilities ensure accurate positioning in these challenging scenarios.
The module is suitable for a wide range of applications, including:
- Automotive navigation (Buses, Lorries, New Energy Vehicles, Driverless Cars)
- Robotics and autonomous systems
- Any application requiring precise positioning in environments with intermittent or weak GPS signals.
8. Troubleshooting
If you encounter issues with your WTGPS-300P module, consider the following common troubleshooting steps:
- No Data Output:
- Check all physical connections, especially the Type-C cable to the PC and the antenna connection to the IPX interface.
- Ensure the module is receiving adequate power (3.3V).
- Verify that the WitMotion software is correctly installed and recognizing the device. Check for any driver issues in your operating system's device manager.
- Inaccurate Positioning:
- Ensure the antenna has a clear view of the sky for optimal satellite signal reception.
- Confirm that the module is securely fixed and not experiencing excessive vibration or movement during operation, as this can affect inertial navigation accuracy.
- Check the software settings to ensure the correct navigation mode and parameters are selected.
- Software Not Responding:
- Restart the WitMotion software and reconnect the module.
- Try connecting the module to a different USB port or another computer to rule out PC-specific issues.
- Ensure your software is up to date.
For more detailed troubleshooting or persistent issues, please refer to the official WitMotion documentation or contact their technical support.
9. User Tips
- Understand Sensor Type: The WTGPS-300P functions as both a tilt angle measurement device and an acceleration sensor, which is crucial for its inertial navigation capabilities. Understanding these core functions can help in interpreting data and optimizing its use in specific applications.
- Leverage Development Kit: Utilize the provided development kit (Software, Manual, Tutorial, Datasheet) for in-depth understanding and secondary development. This can significantly enhance the module's utility for custom projects.
- Optimal Antenna Placement: While the module has no strict mounting restrictions, ensuring the antenna is placed in a location with minimal obstructions will always yield the best satellite signal reception and overall positioning accuracy.
10. Warranty and Support
WitMotion provides comprehensive support for the WTGPS-300P module:
- Lifetime Technical Support: WitMotion offers lifetime technical support for the WTGPS-300P module, ensuring assistance with any technical queries or issues you may encounter.
- Development Resources: A full development kit is available, including software, detailed manuals, tutorials, and datasheets to aid in integration and custom development.
Figure 14: Development Kit Resources
For support, please visit the official WitMotion website or contact their customer service channels.
