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DIY SkyWatch: Building a Military-Grade Drone Tracker

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Aviation surveillance typically demands expensive EO/IR gimbals for locking onto aircraft. Developer Ian Servin recently detailed Project SkyWatch, an open-source effort to replicate that stability using affordable consumer hardware. He tackled a generic PTZ camera's inherent sluggishness, aiming to track fast-moving jets without a defense-contractor budget. The project explores adapting military-grade tracking for civilian use.

Consumer PTZ motors are too slow for 300-knot targets, creating significant latency. Servin moved the heavy lifting from mechanics to mathematics. A custom control loop fuses OpenCV's CSRT tracker for visual locking with a Kalman Filter. This predictor anticipates the aircraft's future position, allowing the camera to lead the target rather than just react to it, smoothing out the visual data.

To overcome the plastic gear limitations and jitter, Servin implemented a digital 'virtual gimbal.' This software layer crops the sensor feed and shifts the frame-by-frame to counteract mechanical imperfections, mimicking expensive hardware stabilization. He also integrated ADS-B telemetry to correlate visual data with live flight telemetry. The project is available on GitHub under an MIT license.