Intrusion detection system and intrusion detection method

An intrusion detection method, applying to multiple IoT devices and a central device, each of the multiple IoT devices being disposed on a space position and configured to send and receive a sensing signal, the central control device connected to the multiple IoT devices receiving the sensing signal, and the intrusion detection method comprising:

• obtaining multiple sensing pairs from a paired combination of the multiple IoT devices;
• making the multiple IoT devices of each of the multiple sensing pairs send and receive signals to obtain features of the multiple sensing pairs;
• creating a sensing-pair list comprising the multiple sensing pairs and the features of each of the multiple sensing pairs;
• obtaining multiple first pairs whose features satisfy a first feature condition from the sensing-pair list;
• scheduling dynamically the multiple IoT devices of the multiple first pairs to send and receive signals in a time sharing fashion to obtain a first sensing signal of each of the multiple first pairs;
• if determining that the first sensing signal satisfies a suspected intrusion condition, tagging the first pair with a first status code, otherwise tagging with a second status code;
• and
• based on a paired node of the multiple first pairs, counting respectively the first status code and the second status code of the multiple first pairs that the paired node belongs, to determine whether any intrusion condition occurs at the space position close to the paired node.