A High-precision Displacement Measurement Method Based on UWB Channel Impulse Response

Abstract

The invention discloses a high-precision displacement measurement method based on UWB channel impulse response, which includes the following steps: S1, setting two UWB transceivers as fixed nodes and mobile nodes respectively, to obtain original channel pulse signals; S2, based on UWB channel pulse Response to the feature extraction of the original channel pulse signal; S3, input the extracted features into the machine learning model of XGBoost for prediction, and obtain the prediction result of relative displacement; S4, use the low-pass filter and polynomial to correct the prediction result, and obtain two Relative displacement between UWB transceivers; among them, S4 uses a low-pass filter to reduce the variance of the prediction result, and uses polynomial compensation to reduce the deviation of the prediction result. Compared with the prior art, the method provided by the present invention adopts the principle of UWB electromagnetic wave ranging, processes the data through the machine learning model of XGBoost, and corrects the error generated by the processing result, which can realize the millimeter-level displacement of large structures real-time monitoring.

Description

technical field [0001] The invention relates to the field of wireless electromagnetic wave propagation and engineering measurement, in particular to a high-precision displacement measurement method based on UWB channel impulse response. Background technique [0002] With the continuous improvement of economic development and people's travel needs, the number of complex structures such as bridges is also increasing. Under the influence of factors such as temperature and load changes, high-rise buildings and long-span bridges will vibrate and move, and even collapse accidents. Structural displacement often reflects the health status of the structure, and structural displacement is one of the physical quantities that must be monitored during structural health monitoring. In recent years, structural catastrophic accidents have occurred frequently due to insufficient design, construction, supervision, and maintenance technical means or due to the coupling of various factors. The...

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Problems solved by technology

The acceleration sensor is not sensitive to the detection of low-frequency vibration amplitude monitoring; the static level has hysteresis to the high-frequency vibration amplitude due to its connecting pipe principle; the cost of the total station and the laser range finder is too high, and the total station is not applicable in real time monitoring

For large structures, such as long-span bridges, it is difficult to play the role of application through traditional multiple monitoring methods

The displacement information of the structure is indirectly collected through the acceleration sensor, which requires two integrations, which leads to an increase in the error

If the displacement sensor is used for direct measurement, there has been no good solution for the installation position of the sensor, especially for the displacement monitoring of long-span bridges, it is difficult to achieve monitoring with displacement sensors

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