RTK NMEA Log (GNSS Logger)

This application is a professional tool designed to connect external GNSS receivers to your smartphone or tablet, enabling high-precision RTK positioning and NMEA data logging. It is ideal for fieldwork requiring centimeter-level accuracy, such as surveying, precision agriculture, and GIS data collection.

[Key Features]

** Versatile Connection Options
Connect to external GNSS receivers via Bluetooth (SPP) or USB serial. For USB connections, you can easily configure detailed serial port settings, including baud rates (from 4800 to 460800 bps), data bits, stop bits, and parity.

** Built-in NTRIP Client
The app features an integrated NTRIP client for Network RTK. By simply configuring the NTRIP caster host, port, mountpoint, and credentials, the app streams RTCM correction data directly to your receiver, achieving RTK Fix precision.

** Real-Time Status Monitoring
The app parses incoming GGA and GSA sentences to display real-time positioning status (Single, DGPS, RTK Fix, RTK Float), the number of tracked satellites, and PDOP values directly on the dashboard.

** Reliable Background Logging
Operating as a foreground service, the app ensures that GNSS communication and NMEA logging continue uninterrupted even when the app runs in the background or the device screen is turned off.

** Raw NMEA File Export
Save the incoming raw NMEA sentences seamlessly into text files (.txt) on your device. The recording elapsed time is displayed on the screen, providing peace of mind during long data collection sessions.

[Use Cases]

* Land surveying and infrastructure inspections using external RTK-GNSS receivers.

* Trajectory recording for smart agriculture tractors and autonomous drones.

* Data collection for academic research and positioning accuracy evaluations.

[Important Notes]

* This app cannot perform RTK positioning using only the smartphone's internal GPS. A separate RTK-capable external GNSS receiver that outputs NMEA is required.

* For USB serial connections, your Android device must support USB Host Mode (USB OTG).

* Using the built-in NTRIP client requires an active internet connection (mobile data or Wi-Fi) and access credentials to an NTRIP caster or VRS network provider.