GPS active antenna on-off detection device

The utility model discloses a GPS (Global Positioning System) active antenna on-off detection device which is characterized in that the device comprises a GPS active antenna, a detection circuit, an external detection circuit and a GPS receiver, wherein the detection circuit is connected in series between the GPS active antenna and the GPS receiver, and the output terminal of the detection circuit is connected with the external detection circuit; the detection circuit comprises a capacitor, an inductor, a resistor and two triodes; base electrodes of the triodes are connected with each other, collectors thereof are connected with a 3.3V power supply voltage via the serial resistor, and emitters thereof are grounded through the serial resistor; and the GPS active antenna is connected with the collector of one triode, of which the emitter is connected with the external detection circuit. The device uses simple triodes and a resistor to form the detection circuit achieving the opening of the GPS antenna through detecting the electric current of the GPS antenna, and has the advantages of simple circuit, low cost, small occupied PCB (printed circuit board) space, convenient detection, low influence over the GPS antenna performance, and the like.