Portable Signal Source Detection Device: Portable signal source detection devices, real-time acquisition of peripheral radio signals when the equipment is operating, scanning according to the configured frequency band. When the low-altitude UAV target enters the defense area, the suspicious link signal is monitored and identified to obtain the target working frequency band, distance and other information. The device can not only detect the drone, but also identify the drone’s model, serial number, longitude, latitude, altitude, pilot position, and the location of the return point. The device is passive detection which does not produce any electromagnetic signal simulation to the outside world, green and safe, suitable for long-term continuous scenario.