Displacement monitoring system and method

Abstract

The invention discloses a displacement monitoring system and a method. The system comprises a wireless beacon module, a signal receiving module and a signal processing module, wherein the wireless beacon module comprises N wireless beacons, is fixed to a structure to be measured and emits wireless signals; the signal receiving module comprises M receiving antennas, are used for receiving the wireless signals and converts the signals into digital signals, wherein the N is greater than or equal to 1 and the M is greater than or equal to 2; the signal processing module receives the digital signals and decomposes the signals of the different wireless beacons, carries out code phase demodulation and carrier wave phase demodulation processing respectively and finally integrally receives a code phase demodulation result and a carrier wave phase demodulation result of the signals between each two antennas so as to acquire a displacement monitoring result. By using the system and the method in the invention, millimeter precision displacement monitoring can be realized; the system structure is simple, time synchronization is not needed, laying is convenient and cost is low; and there is no significant change along with increase of the number of nodes.

Description

technical field

[0001] The invention relates to a radio positioning engineering measurement sensor network, in particular to a high-precision displacement monitoring system. Background technique

[0002] Displacement monitoring is widely used in structural health monitoring, including artificial structures such as bridges and dams and natural structures such as mountains and glaciers. The monitoring method is to measure the displacement of key points of the structure over time and changes in the external environment to achieve quality control of the measured structure. The purpose of evaluation, security warning, etc.

[0003] Total Station (TotalStation) is an opto-mechanical integrated instrument commonly used in modern surveying and mapping. Its working principle is to use high-precision photoelectric ranging and electronic theodolite to realize direction finding and ranging of remote control points. Laser is very suitable for distance measurement due to its good directi...

Examples

Embodiment 1

[0054] The wireless beacon module uses ArduinoProMini as the encoding controller, and the HC-11 wireless serial port module based on the CC1101 RF transceiver chip is responsible for the transmission of RF signals. The working frequency band is 433MHz and the working distance is about 1000m. Since the B210 has two RF channels, it can realize one-dimensional displacement monitoring.

[0055] The signal receiving module uses the USRPB210 development board of Ettus Company, and the development board includes radio frequency switch, amplifier, transceiver, FPGA and USB3.0 interface, etc. The antenna adopts 433MHz3dB gain standard helical antenna. The feeder adopts KSR400 / LMR400 coaxial cable.

[0056] The signal processing module is implemented based on the CPU, the specific hardware is the mobile workstation ThinkPadW520, the software is implemented based on the signal processing program developed by GNURadio, and the software algorithm is as mentioned above.

Embodiment 2

[0058] The hardware of the signal processing module and the signal receiving module remain unchanged, and the receiving frequency is set to 2.4GHz by software.

[0059] The wireless beacon uses a wireless module based on nRF24101+ and works at 2.4GHz.

Embodiment 3

[0061] The signal processing module is implemented based on embedded CPU and FPGA. The specific hardware is XilinxZynq-7000 fully programmable SoCZC706 evaluation board. The core device is XilinxZynq-7000 which contains ARM core and FPGA, which can realize high-speed signal processing.

[0062] The signal receiving module uses ADI's AD-FMCOMMS5-EBZ development board, which has two dual-channel RF transceivers on board, which can realize the transmission and reception of four-way RF signals, and can realize three-dimensional displacement monitoring.

[0063] The wireless beacon can be realized by using example 1 or 2.

technical field

[0001] The invention relates to a radio positioning engineering measurement sensor network, in particular to a high-precision displacement monitoring system. Background technique

[0002] Displacement monitoring is widely used in structural health monitoring, including artificial structures such as bridges and dams and natural structures such as mountains and glaciers. The monitoring method is to measure the displacement of key points of the structure over time and changes in the external environment to achieve quality control of the measured structure. The purpose of evaluation, security warning, etc.

[0003] Total Station (TotalStation) is an opto-mechanical integrated instrument commonly used in modern surveying and mapping. Its working principle is to use high-precision photoelectric ranging and electronic theodolite to realize direction finding and ranging of remote control points. Laser is very suitable for distance measurement due to its good directi...

Examples

Embodiment 1

[0054] The wireless beacon module uses ArduinoProMini as the encoding controller, and the HC-11 wireless serial port module based on the CC1101 RF transceiver chip is responsible for the transmission of RF signals. The working frequency band is 433MHz and the working distance is about 1000m. Since the B210 has two RF channels, it can realize one-dimensional displacement monitoring.

[0055] The signal receiving module uses the USRPB210 development board of Ettus Company, and the development board includes radio frequency switch, amplifier, transceiver, FPGA and USB3.0 interface, etc. The antenna adopts 433MHz3dB gain standard helical antenna. The feeder adopts KSR400 / LMR400 coaxial cable.

[0056] The signal processing module is implemented based on the CPU, the specific hardware is the mobile workstation ThinkPadW520, the software is implemented based on the signal processing program developed by GNURadio, and the software algorithm is as mentioned above.

Embodiment 2

[0058] The hardware of the signal processing module and the signal receiving module remain unchanged, and the receiving frequency is set to 2.4GHz by software.

[0059] The wireless beacon uses a wireless module based on nRF24101+ and works at 2.4GHz.

Embodiment 3

[0061] The signal processing module is implemented based on embedded CPU and FPGA. The specific hardware is XilinxZynq-7000 fully programmable SoCZC706 evaluation board. The core device is XilinxZynq-7000 which contains ARM core and FPGA, which can realize high-speed signal processing.

[0062] The signal receiving module uses ADI's AD-FMCOMMS5-EBZ development board, which has two dual-channel RF transceivers on board, which can realize the transmission and reception of four-way RF signals, and can realize three-dimensional displacement monitoring.

[0063] The wireless beacon can be realized by using example 1 or 2.

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