I'm curious: How do drones (unmanned aerial vehicles) manage to pinpoint their location with such precision? Is basic GPS enough, or do they rely on additional sensors? And how do they minimize the risk of being affected by weather conditions?
How do drones use GPS?
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Drone GPS accuracy isn’t just limited to basic GPS—most models continuously correct their position using specialized sensors like IMUs (Inertial Measurement Units) and vision-based systems (optical flow). External factors like wind or electromagnetic interference are balanced out with a "GPS Lock" (waiting for a stable satellite signal) and built-in air sensors. Personally, I’ve flown DJI Mini series in rainy conditions and maintained stability, though I think the specifics vary by model and manufacturer.
I've seen that GPS alone isn't enough—pilots constantly face stability issues with wind and other factors without additional sensors. For drones, a 3-axis IMU (gyroscope + accelerometer) and barometer are essential alongside GPS. The IMU detects sudden movements and corrects positioning; even if GPS signal is lost, they continue from the "last estimated point."
For weather conditions, RTK GPS provides cm-level accuracy, and optical flow sensors help with low-altitude positioning. In windy conditions, PID control systems react quickly—when paired with air sensors in my projects, stability improved significantly.