Methods and systems of scanning microwave vibration and deformation measurement

Patent metadata

Field	Value
Publication number	US-12436259-B2
Application number	US-202218266339-A
Country	US
Kind code	B2
Filing date	Aug 18, 2022
Priority date	Apr 22, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A scanning method and system for measuring microwave vibration and deformation include simultaneously transmitting linear-frequency-modulation continuous waves by using a plurality of transmit antennas and enabling a main lobe of a synthesized beam to be directed towards a specific angle direction; receiving echoes by using a plurality of receive antennas to obtain vibration and deformation displacement values of a single target or multiple targets in an angle direction 1 of a cycle; through the phase shift control on the plurality of transmit antennas, extracting vibration and deformation displacement values of a single target or multiple targets in an angle direction 2 of the cycle based on the foregoing method; according to a measurement requirement, measuring and extracting vibration and deformation displacement values of a single target or multiple targets in another angle direction of the cycle; and obtaining vibration and deformation displacement time sequence values of all scanned points.

First claim

The invention claimed is:

1. A scanning method for measuring microwave vibration and deformation, comprising the following steps:
step S1: simultaneously transmitting linear-frequency-modulation continuous waves by using a plurality of transmit antennas, performing a phase shift control on transmit signals of the plurality of transmit antennas, and enabling a main lobe of a synthesized beam to be directed towards a measured specific angle direction;
step S2: receiving echoes by using a plurality of receive antennas to obtain multi-channel baseband signals, and performing a non-linear demodulation processing on the acquired multi-channel baseband signals to obtain vibration and deformation displacement values of a single target or point for inspection in an angle direction 1 of a cycle or obtain vibration and deformation displacement values of a plurality of targets or points for inspection in the angle direction 1 of the cycle;
step S3: offsetting an angle of the main lobe of the synthesized beam through the phase shift control on the plurality of transmit antennas, and extracting vibration and deformation displacement values of a single target or point for inspection in an angle direction 2 of the cycle based on the foregoing method or vibration and deformation displacement values of a plurality of targets or points for inspection in the angle direction 2 of the cycle; according to a measurement requirement, measuring and extracting vibration and deformation displacement values of a single target or point for inspection in another angle direction of the cycle or measuring and extracting vibration and deformation displacement values of a plurality of targets or points for inspection in the another angle direction of the cycle; and
step S4: according to the foregoing scanning method, at intervals of a specific cycle time, measuring vibration and deformation through circular scanning in angle directions, to obtain vibration and deformation displacement time sequence values of all scanned points or targets for inspection.

2. The scanning method for measuring the microwave vibration and deformation according to claim 1 , wherein in step S1, the performing phase shift control on transmit signals of the plurality of transmit antennas is completed through the following method:
if an angle of a target or point for inspection in a microwave front-end radiating wave is set to θ 0 , controlling phase shifts of antennas in the transmit antenna array respectively to be 0, 2πd 2 sin θ 0 /λ c , . . . , and 2πd K sin θ/λ c , a first antenna being taken as a reference point, wherein d k (k=2, . . . N) represents a distance between a k th transmit antenna and the first transmit antenna, and λ c represents a wavelength corresponding to a linear-frequency-modulation continuous-wave center frequency; and
arranging the transmit antenna array at equal spacing or at unequal spacing sparsely, wherein the transmit antenna array is arranged horizontally during scanning at a horizontal angle, the transmit antenna array is arranged vertically during scanning at a pitching angle, and the transmit antenna array is arranged both horizontally and vertically during scanning at a spatial angle.

3. The scanning method for measuring the microwave vibration and deformation according to claim 1 , wherein the scanning angle and distribution are determined according to a measurement requirement or a spatial arrangement of the point or target for inspection.

4. The scanning method for measuring the microwave vibration and deformation according to claim 1 , wherein the scan angle direction required in steps S1 to S3 is obtained according to prior knowledge, the measurement requirement, or initial locating information of points for inspection in full field.

5. The scanning method for measuring the microwave vibration and deformation according to claim 1 , wherein in steps S2 to S4, a non-linear demodulation method for extracting vibration and deformation displacement values of a single target, point for inspection, a plurality of targets, or points for inspection in a specific scan-cycle angle direction comprises the following steps:
calculating, by means of the following formula, a vibration and deformation displacement sequence element value x(p,θ s ,R), extracted through the non-linear demodulation method, of an inspected target or point in a current scan cycle:

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Assignees

• Univ Shanghai Jiaotong

Inventors

• Xiong Yuyong
• Peng Zhike

Classifications

• G01S13/342

  using sinusoidal modulation · CPC title

• G01S7/352

  Receivers · CPC title

• G01S7/2813

  Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays (specially adapted to secondary radar systems G01S13/762; aerials or aerials systems H01Q21/29, H01Q25/00) · CPC title

• G01S7/35

  Details of non-pulse systems · CPC title

• G01S13/584

  adapted for simultaneous range and velocity measurements · CPC title