Method of using wireless receipt signal to detect mobile entity

The invention relates to a method of using a wireless receipt signal to detect a mobile entity. A monitor deploys a wireless signal transceiver device in an area to be monitored; the wireless signal transceiver device continuously transmits signals with stable intensity in a monitoring period, and simultaneously a receiving device observes the receipt signal intensity and judges whether there is mobile entity such as a human or an animal in the monitoring area according to the variation amplitude of the signal intensity. The method of the invention only needs to deploy the low-cost wireless signal transceiver device in the area needing to monitor and could roughly judge whether there is mobile entity such as the human or the animal in the monitoring area according to the intensity change of the receipt signal. Compared with the technology such as video monitoring and infrared monitoring, the method of the invention is easy to deploy, low in cost and not sensitive to the environmental factor such as illumination, temperature, and so on, and the method of the invention could be applied to all-weather automatic monitoring indoor and outdoor.