GPS / GNSS Position Lab
Parse GNSS data, evaluate fix quality and protect precise location information.
Topology and objective
GNSS receiver UART → MCU parser → local map/telemetry display.
Hardware and tools
- Supported development board
- USB data cable
- Current-limited supply
- Serial monitor and logic analyser when applicable
Security and RF safety
- Treat precise location as personal data.nDo not publish home/student coordinates.nUse synthetic or coarse coordinates in screenshots and reports.
Practical procedure
- Connect UART at documented voltage and baud.nPlace antenna with sky view.nParse time, coordinates, fix type and satellites.nReject stale or invalid fixes.nCompare repeatability at a known safe test point.
Telemetry / payload
{"fix":true,"satellites":9,"hdop":1.1,"lat":"REDACTED","lon":"REDACTED"}Starter code / config
$GNGGA,... (use recorded or synthetic data in public demonstrations)Expected results
| Checkpoint | Expected | Tool |
|---|---|---|
| Fix | Valid fix and UTC time | SerialnQuality |
Troubleshooting
| Symptom | Check | Action |
|---|---|---|
| No fix | Check antenna view and cold-start time | Move outdoors safely and waitnGarbled NMEA |
Local-only sandbox
Commands & telemetry simulator
Send command
Simulator ready. No network connection is used.