The Multi-Sensor Drone Detection System enables unauthorized unmanned aerial vehicles to be detected, classified and tracked at an early stage. Data from RF, radar, camera and acoustic sensors is correlated by time and location and merged into a single target picture. This structure reduces blind spots and false alarms. Multiple targets are tracked simultaneously on a map, and the camera is turned to the target automatically. The system can be deployed as a portable case, vehicle-mounted or fixed installation. Radar use is subject to frequency allocation. Use and export are subject to applicable regulations and permits.