PKI 4355 is designed to seek and acquire the moving target at altitudes between 100 – 1000m and at super-deep altitudes below 100m in all directions and in all weather conditions. PKI 4355 can detect the UAV target and provide early warning by analyzing and detecting the UAV control signal and data link return signal. Passive detection does not transmit electromagnetic signals, making it not only environmentally friendly, but also ideal for use at airports because PKI 4355 does not emit any interfering signals. It can be installed on a tripod for temporary use or permanently mounted on a mast for longer-term protection in areas with high security requirements, both are possible.