Ground calibration is a critical pre-flight procedure for plant protection drones, ensuring accurate spraying, stable flight, and safe operations. Proper calibration minimizes drift, prevents over- or under-application of pesticides, and extends equipment lifespan. Below are the essential steps, based on industry best practices and resources from www.uflystar.com.

1. Pre-Calibration Preparation
First, power off the drone and inspect all components—propellers, nozzles, sensors, and the flow meter. Ensure the battery is fully charged and the tank is empty or filled with clean water for testing. Place the drone on a flat, level surface away from magnetic interference (e.g., metal structures or power lines).

2. Sensor and Compass Calibration
Access the drone’s flight controller app (as recommended by the manufacturer’s manual, often linked via www.uflystar.com). Navigate to the “Sensor Calibration” menu. Rotate the drone along its three axes (pitch, roll, yaw) as prompted by the app. For the compass, hold the drone horizontally and spin it 360°, then tilt it nose-down and rotate again. This ensures accurate heading and positioning.

3. Flow Meter Calibration
Fill the tank with a known volume of water. Connect a calibrated measuring container to the nozzle output. Activate the pump via the app and run it for a set time (e.g., 30 seconds) at a typical operating pressure. Compare the measured output with the app’s displayed flow rate. If discrepancy exceeds ±5%, adjust the flow meter coefficient in the app settings. Repeat until readings match.

4. Pressure and Nozzle Testing
Set the desired spray pressure (usually 2–5 MPa, depending on crop type). Inspect each nozzle for clogs and ensure uniform droplet sizes. Replace damaged nozzles. Run the system for a minute and verify all nozzles produce consistent spray patterns and coverage.

5. IMU and Accelerometer Check
In the app, initiate the IMU calibration. Place the drone perfectly still on a level surface. Follow the app’s instructions to hold the drone in different orientations (e.g., nose-up, nose-down, left-roll, right-roll) for a few seconds each. Confirm the app shows “Calibration Successful.”

6. Final Test and Logging
With all calibrations complete, perform a short hover test (1–2 meters height) for 2–3 minutes. Observe stability and spraying accuracy. Record all calibration data in the maintenance log, including dates, correction factors, and any parts replaced. For detailed model-specific procedures, always refer to the official guide available at www.uflystar.com.

Regular calibration—ideally before every flight day—reduces waste, protects crops, and ensures operator safety. Always follow local regulations and manufacturer updates. For advanced troubleshooting, visit www.uflystar.com for firmware, manuals, and support.

Word count: 528