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Vibration monitoring system and signal processing method based on LFMCW radar

A vibration monitoring system and vibration monitoring technology, applied in radio wave measurement systems, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of limited distance resolution, difficulty in extracting small vibration distance changes, etc., and achieve a small amount of calculation , good system integration, and high estimation accuracy

Active Publication Date: 2018-01-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

By estimating the frequency of the beat signal, the distance information of the target from the radar is obtained, but due to the limitation of the radar transmission bandwidth, the distance resolution is limited, and it is difficult to extract the small distance change caused by vibration

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  • Vibration monitoring system and signal processing method based on LFMCW radar
  • Vibration monitoring system and signal processing method based on LFMCW radar
  • Vibration monitoring system and signal processing method based on LFMCW radar

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Embodiment Construction

[0044]The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to protection domain of the present invention.

[0045] A vibration monitoring system based on LFMCW radar of the present invention adopts linear frequency modulation continuous wave radar to monitor the vibration motion of the target object, based on the principle of radar interference technology, by estimating the initial phase time series of the baseband beat signal, the vibration displacement time domain information is extracted . see figure 1 , shows a schematic diagram of vibration monitoring based on LFMCW radar. The radar antenna faces the monito...

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Abstract

The invention provides a vibration monitoring system and a signal processing method based on LFMCW (Linear Frequency Modulation Continuous Wave) radar. The vibration monitoring system comprises a radar transceiver, a tuned signal generator, a data collection module, a signal processing module, and a display and analysis module. The signal processing method comprises the following steps: step one,capturing effective baseband beat signals within each frequency sweep period, and generating composite beat signals; step two, estimating the beat frequency; step three, carrying out phase estimationthrough an algorithm similar to maximum likelihood estimate; step four, carrying out phase jump correction on an estimated initial phase time sequence; and step five, extracting vibration displacementtime domain information. The LFMCW radar is utilized to conduct non-contact type vibration movement sensing, vibration displacement time domain information is extracted by accurately estimating the initial phase of the beat signals within each frequency sweep period, and vibration monitoring requirements for target objects in an extreme environment and from a medium or short distance are satisfied.

Description

technical field [0001] The present invention relates to the technical field of vibration monitoring, in particular to a vibration monitoring system and a signal processing method based on LFMCW radar, wherein LFMCW represents linear frequency modulation continuous wave. Background technique [0002] Vibration monitoring is widely used in various fields of production and life, and is an important means to realize condition monitoring and fault diagnosis. Generally, vibration monitoring is performed by a contact sensor, such as an accelerometer, that senses the vibration movement, and extracts vibration displacement, frequency and other information through subsequent signal processing. Motion perception technology based on microwave radar is a non-contact measurement technology that can work stably in harsh environments and is not affected by weather conditions such as rain and snow. It can realize all-weather monitoring and measurement. It has been applied to human vital sign...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01H9/00
Inventor 彭志科熊玉勇
Owner SHANGHAI JIAO TONG UNIV
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