GNSS Antenna Module HM-G51B

1.Q: Are the latitude, longitude, and altitude data from the module or the antenna?
A: The positioning data is calculated and output by the GNSS module, while the integrated antenna is responsible for receiving satellite signals. The final positioning result corresponds to the module’s computed solution based on received multi-constellation signals.

2. Q: Can GNSS data be integrated into our own software system?
A: Yes. The module outputs positioning data via a standard UART interface and supports common protocols such as NMEA and UBX. Users can easily parse and integrate the data into their own systems, including applications based on ROS, Python, or C/C++.

3.Q: Where is the positioning data processed and stored?
A: All positioning calculations are completed internally by the GNSS module, and the data is output in real time through the serial interface. External storage or processing is not required unless defined by the user’s application.

4. Q: What is the output interface of the module — TTL or RS232?
A: The HM-G51B uses a TTL-level UART interface, which is widely compatible with flight controllers, embedded systems, and development boards.

5. Q: How can the module be connected to a flight controller (e.g., PX4)?
A: The module can be connected directly to the GPS port (such as GPS1 or GPS2) on the flight controller via UART. After connection, users can configure parameters in the flight control software according to the system requirements.

6. Q: Do we need to configure parameters via upper computer software?
A: No additional configuration is required for basic use. The module is pre-configured at the factory for standard GNSS output, and advanced configuration can be performed if customization is needed.

7. Q: Is there latency in GNSS positioning data?
A: The module outputs positioning data in real time after internal processing, with minimal internal delay. Actual system latency may depend on the user’s data parsing and application processing.

8. Q: Does the module require an external antenna?
A: No. The HM-G51B integrates both the GNSS receiver and antenna into a single module, eliminating the need for an external antenna and simplifying system design.

9.Q: What satellite systems does the module support?
A: The module supports multiple GNSS constellations, including GPS, GLONASS, BeiDou, Galileo, and QZSS, which improves signal availability and positioning stability in complex environments.

10.Q: What is the positioning accuracy of the module?
A: The module provides approximately 1.5 meter CEP positioning accuracy under open-sky conditions, which is suitable for navigation, tracking, and general positioning applications.

11.Q: Does the module support high-precision RTK positioning?
A: No. The HM-G51B is a standard GNSS module and does not support RTK centimeter-level positioning. It is designed for applications requiring stable and efficient positioning rather than high-precision surveying.

12.Q: What factors affect GNSS performance?
A: GNSS performance is mainly affected by satellite visibility, installation orientation, surrounding obstructions, and electromagnetic interference. For best results, the module should be installed facing upward in an open-sky environment.