Anomalies detection system and method for structure

A structure detection method, comprising:

• communicating a first transceiver with a second transceiver to detect a structure;
• configuring the first transceiver and the second transceiver to perform a first time-reversal (TR) test, wherein in a first TR test, the first transceiver is configured to send a first probing signal, the second transceiver is configured to receive the first probing signal and to perform a time-reversal (TR) process to generate a first TR signal to be sent to the first transceiver, and the first transceiver is configured to obtain a first channel state information (CSI) in response to the first TR signal;
• configuring the first transceiver and the second transceiver to perform a second TR test, wherein in the second TR test, the second transceiver is configured to send a second probing signal, the first transceiver is configured to receive the first probing signal and to perform the TR process to generate a second TR signal to be sent to the second transceiver, and the second transceiver is configured to obtain a second CSI in response to the second TR signal;
• configuring a processor provided in the first transceiver, the second transceiver or a server to compare a combination of the first CSI and the second CSI to a reference CSI for detecting anomalies associated with the structure, wherein the first CSI, the second CSI and the reference CSI are each represented by a CSI matrix H, wherein H=[H1, H2, . . . , Hn], where H1, H2, . . . , Hn are components each including an amplitude and a phase of each of a plurality of subcarriers;
• and
• configuring the processor to execute a detection algorithm to compare an average amplitude matrix HA of the first CSI and the second CSI to an average reference amplitude matrix HS of the reference CSI for detecting anomalies associated with the structure;
• wherein HA=[(∥H11∥+∥H12∥)/2, (∥H21∥+∥H22∥)/2, . . . , (∥Hn1∥+∥Hn2∥)/2], where ∥H11∥, ∥H21∥, . . . , ∥Hn1∥ are amplitudes of each of the plurality of subcarriers obtained in the first CSI, and ∥H12∥, ∥H22∥, . . . , ∥Hn2∥ are amplitudes of each of the plurality of subcarriers obtained in the second CSI, and
• wherein HS=[∥Havg1∥, ∥Havg2∥, . . . , ∥Havgn∥], where ∥Havg1∥, ∥Havg2∥, . . . , ∥Havgn∥ are amplitudes of each of the plurality of subcarriers in the reference CSI.