Anomalies detection system and method for structure

Patent metadata

Field	Value
Publication number	US-10484208-B2
Application number	US-201815903101-A
Country	US
Kind code	B2
Filing date	Feb 23, 2018
Priority date	Feb 23, 2018
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A structure detection system and method for detecting anomalies associated with the structure are provided. The system includes a first transceiver, a second transceiver, and a processor. In a first TR test, the second transceiver receives a first probing signal sent from the first transceiver and performs a time-reversal (TR) process to generate a first TR signal to be sent to the first transceiver, and a first channel state information (CSI) is obtained in response to the first TR signal. In a second TR test, the first transceiver receives a second probing signal sent from the second transceiver and performs the TR process to generate a second TR signal to be sent to the second transceiver, a second CSI is obtained in response to the second TR signal. The processor compares a combination of the first CSI and the second CSI to a reference CSI for detecting anomalies.

First claim

What is claimed is:

1. A structure detection system, comprising:
a first transceiver;
a second transceiver, communicating with the first transceiver to detect a structure, wherein in a first time-reversal (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 time-reversal (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 time-reversal (TR) signal, and wherein in a second time-reversal (TR) test, the second transceiver is configured to send a second probing signal, the first transceiver is configured to receive the second probing signal and to perform the TR process to generate a second time-reversal (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; and
a processor provided in the first transceiver, the second transceiver or a server and configured 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;
wherein the processor is further configured 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.

2. The structure detection system according to claim 1 , wherein the structure is a bridge.

3. The structure detection system according to claim 1 , wherein a number of the plurality of subcarriers of the first CSI is as the same as a number of the plurality of subcarriers of the second CSI and a number of the plurality of subcarriers of the reference CSI.

4. The structure detection system according to claim 1 , wherein the processor is further configured to determine whether √{square root over (Σ(HS−HA) 2 )} is larger than a threshold value, and if yes, the anomalies are determined to exist in the structure.

5. The structure detection system according to claim 1 , wherein the reference CSI is obtained by performing the first TR test and the second TR test when the structure is without anomalies.

6. The structure detection system according to claim 5 , wherein a first time of day for obtaining the reference CSI is substantially the same as a second time of day for obtaining the first CSI and the second CSI.

7. The structure detection system according to claim 1 , wherein the processor is further configured to control at least one of a trigger sequence, a trigger timing, and a trigger period associated to the first TR test and the second TR test.

8. The structure detection system according to claim 1 , wherein the processor is configured to change at least one of an operation bandwidth, a communication power, and a communication direction of the first transceiver and the second transceiver if an anomaly associated with the structure is detected.

9. 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.

10. The structure detection method according to claim 9 , wherein a number of the plurality of subcarriers of the first CSI is as the same as a number of the plurality of subcarriers of the second CSI and a number of the plurality of subcarriers of the reference CSI.

11. The structure detection method according to claim 9 , wherein the processor is further configured to determine whether √{square root over (Σ(HS−HA) 2 )} is larger than a threshold value, and if yes, the anomalies are determined to exist in the structure.

12. The structure detection method according to claim 9 , further comprising:
obtaining the reference CSI by performing the first TR test and the second TR test when the structure is without anomalies.

13. The structure detection method according to claim 9 , wherein an operation time of day for obtaining the reference CSI is as the same as a test time of day for obtaining the first CSI and the second CSI.

14. The structure detection method according to claim 13 , further comprising:
configuring the processor to control at least one of a trigger sequence, a trigger timing, and a trigger period associated to the first TR test and the second TR test.

15. The structure detection method according to claim 9 , further comprising:
configuring the processor to change at least one of an operation bandwidth, a communication power, and a communication direction of the first transceiver and the second transceiver if an anomaly associated with the structure is detected.

Assignees

• Wistron Neweb Corp

Inventors

• Wang Chia-Hsiang
• Chen Horen

Classifications

• H04L25/022

  of frequency response · CPC title

• H04L25/0212

  of impulse response · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04L25/0224 Primary

  using sounding signals · CPC title