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MIMO two-dimensional high-resolution radar bridge vibration frequency and amplitude measurement method

A vibration frequency and measurement method technology, applied in measurement devices, radio wave measurement systems, measurement of ultrasonic/sonic/infrasonic waves, etc. 2D high precision effect

Pending Publication Date: 2022-03-25
苏州理工雷科传感技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The accuracy can reach the submillimeter level, but only one-dimensional vibration information and the distance from the vibration area to the radar can be obtained, and the spatial accurate positioning of the vibration area cannot be achieved

Method used

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  • MIMO two-dimensional high-resolution radar bridge vibration frequency and amplitude measurement method
  • MIMO two-dimensional high-resolution radar bridge vibration frequency and amplitude measurement method
  • MIMO two-dimensional high-resolution radar bridge vibration frequency and amplitude measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0118] like figure 1 Described, a kind of MIMO two-dimensional high-resolution radar bridge vibration frequency and amplitude measurement method, the steps include:

[0119] In the first step, the MIMO radar is placed at a distance of 65 meters from the bridge, and the MIMO radar line of sight direction and the horizontal angle range of the bridge body are 30°, and the MIMO radar line of sight direction and the vertical angle range of the bridge body are 30°, among which the MIMO radar includes 8 If there are 8 transmitting antennas and 8 receiving antennas, the number of transmitting and receiving channels of the MIMO radar is N=64; the vibration displacement measured by the radar is the radial distance direction of the bridge body, so the measured vibration is the vibration in multiple directions of the bridge body in this direction In order to improve the measurement accuracy, the radar line of sight direction needs to maintain a set angle with the vertical and horizontal ...

example 1

[0159] Take K=2, f i =1922,n i =52, that is, take the value S of the coordinate (1922,52) of the second picture xy (1922,52,2)=6.0463, the value S of the coordinates (1922,52) of the first picture xy (1922,52,1)=5.7964, then

[0160] D(1922,52,2)=S xy (1922,52,2)-S xy (1922,52,1)=0.42

[0161] This coordinate point is considered as static clutter.

example 2

[0163] Take K=2, f i =333,n i =60 means take the value S of the coordinates (333,60) of the second picture xy (333,60,2)=3395.4, the value S of the coordinates (2032,60) of the first picture xy (333,60,1)=3226.3, then

[0164] D(333,60,2)=S xy (333,60,2)-S xy (333,60,1)=169.0511

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Abstract

The invention relates to an MIMO two-dimensional high-resolution radar bridge vibration frequency and amplitude measurement method, and belongs to the technical field of bridge monitoring. According to the method, support is provided for dynamic characteristic analysis, all positions of the bridge in the space can be reconstructed through azimuth direction and distance direction information, vibration information of all the positions can be obtained, and therefore the method can be used for dynamic characteristic analysis of the bridge, spatial filtering can be achieved, and the accuracy of dynamic characteristic analysis is improved. The real aperture radar achieves the purpose of improving the signal-to-noise ratio through a traditional coherent accumulation technology. According to the method, the signal-to-noise ratio can be improved through a phase-coherent accumulation technology, and noise can be effectively filtered by adding a spatial domain filtering technology. Noise filtering not only solves the influence of misjudgment caused by false vibration points caused by noise in a non-vibration area, but also solves the influence of parameter extraction precision reduction caused by noise in a vibration area.

Description

technical field [0001] The invention relates to a method for measuring the vibration frequency and amplitude of a MIMO two-dimensional high-resolution radar bridge, belonging to the technical field of bridge monitoring. Background technique [0002] As an important infrastructure of the country, the bridge structure will have problems such as structural aging and damage with the increase of service time and the influence of wind, earthquake and other natural conditions and operating loads. For example, it is impossible to timely and accurately evaluate the structural health status and identify the damaged parts It will further accelerate aging, and even cause serious disasters such as collapses, posing a huge threat to social property and people. [0003] At present, the theoretical system of structural health monitoring and assessment based on sensor measurement has been basically established. In this theoretical system, structural damage detection and health status assess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/42G01S7/41G01H17/00
CPCG01S13/9021G01S7/42G01S7/41G01H17/00
Inventor 王宏宇于慧周大明姚迪江志远
Owner 苏州理工雷科传感技术有限公司
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