Method and System for Calibration of the Angle Between Microwave Vibration and Deformation Displacement Measurement

Abstract

This invention provides a method and system for calibrating the angle between microwave vibration and deformation displacement measurements, comprising: Step 1: A linear motion mechanism is used to induce a stroke displacement in the microwave transceiver, extracting the vibration or deformation displacement time series of the target or measuring point, and calculating the angle between the vibration direction of the target or measuring point and the line of sight, thus completing the calibration process; Step 2: The microwave transceiver is kept stationary, and the vibration or deformation displacement time series of the target or measuring point is extracted again. The angle obtained from the calibration is used to correct the angle of this series, yielding the true displacement time series of the target or measuring point. This invention achieves accurate calibration of the angle between the line of sight of the microwave transceiver and the direction of vibration and deformation displacement of the target under complex outdoor conditions such as long distances and high altitudes, improving the convenience and accuracy of angle calibration for microwave vibration and deformation displacement measurements under complex conditions.

Description

Technical Field

[0001] This invention relates to the field of vibration and deformation measurement technology, specifically to a method and system for calibrating the included angle of microwave vibration and deformation displacement measurement. Background Technology

[0002] Vibration is a common phenomenon in nature and engineering. Measuring vibration and deformation provides crucial sensing data for structural health monitoring, material performance evaluation, equipment fault diagnosis, and research on the dynamic behavior of objects, making it of significant engineering value. According to different measurement methods, testing methods can be divided into contact measurement and non-contact measurement. Non-contact methods have significant advantages in practical engineering because they are non-destructive and non-interfering with the measured object, and are suitable for large structures or objects that are inconvenient to approach at a distance. However, visual and laser methods have significant limitations in terms of measurement performance, environmental adaptability, and hardware cost. Microwave-based vibration and deformation displacement measurement is a novel vibration and deformation measurement technology that can achieve both micro-amplitude and large-amplitude vibration and deformation measurements. However, the direct result of microwave vibration and deformation displacement measurement is the displacement of the target along the line of sight of the microwave transceiver, requiring geometric conversion, which presupposes the angle φ between the target displacement direction and the microwave sensing line of sight. q It is known that in practical engineering surveying, if the object being measured is large, has a complex structure, or the measuring point is far from the microwave transceiver or high above the ground, it is often difficult to measure the vertical distance from the target along its displacement direction to the mounting plane of the microwave transceiver, making it difficult to determine the included angle φ. q It is impossible to achieve high-precision displacement measurement geometric conversion, making it difficult to measure the actual displacement time series of the measured object.

[0003] Patent document CN105044693A (application number: CN201510359715.0) discloses a method for correcting amplitude and phase errors of microwave correlated imaging radar based on auxiliary array elements. This method estimates the amplitude and phase errors of the microwave correlated imaging radar and then compensates for these errors to obtain a more ideal spatiotemporal radiation field. The method includes: Step 1: The transmitting antenna array of the microwave correlated imaging radar transmits multiple waveforms, and the receiving antenna array receives the corresponding multiple echo data. The echo data is matched and filtered, and then sequentially arranged to obtain an echo data matrix; Step 2: The elements in the echo data matrix are grouped; Step 3: The data covariance matrix is ​​estimated; Step 4: The target angle is estimated to obtain the target direction vector; Step 5: The amplitude and phase errors of the transmitting antenna array are estimated respectively to obtain corresponding error estimates; Step 6: Based on the estimated amplitude and phase errors of the transmitting antenna array, the amplitude and phase of the transmitting antenna array are corrected respectively.

[0004] Existing angle calibration methods require measuring the perpendicular distance L from the microwave transceiver to the target's displacement direction, or the distance H from the target along the displacement direction to the microwave transceiver's mounting plane, and then using trigonometric relationships to calculate the angle φ between the target's displacement direction and the microwave sensing line of sight. q In practical engineering, due to limitations in the testing environment, such as the target or measuring point being at a high altitude, at a great distance, or having a large volume or complex structure, the convenience and accuracy of measuring these two distances are poor, and they are often impossible to perform, resulting in the inability to measure the true displacement information of the target or measuring point. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method and system for calibrating the angle between microwave vibration and deformation displacement measurement.

[0006] The method for calibrating the included angle between microwave vibration and deformation displacement measurement according to the present invention includes:

[0007] Step 1: Using a linear motion mechanism, a one-way or reciprocating relative displacement is generated between the microwave transceiver and the target or measuring point. The vibration or deformation displacement time series of the target or measuring point is extracted, and the angle φ between the displacement direction of the target or measuring point and the line of sight is calculated. q Complete the calibration process;

[0008] Step 2: Keep the microwave transceiver stationary, and extract the vibration or deformation displacement time series of the target or measuring point again. Use the calibrated included angle φ q Geometric conversion is performed on this sequence to obtain the true displacement time series of the target or measuring point.

[0009] Preferably, step 1 includes:

[0010] Step 1.1: Install and arrange the measuring equipment and generate single-stroke or reciprocating relative displacement based on the linear motion mechanism;

[0011] Step 1.2: Extract the vibration or deformation displacement time series of the target or measuring point;

[0012] Step 1.3: Calculate the angle φ between the displacement direction of the target or measuring point and the line of sight of the microwave transceiver. q ;

[0013] Step 1.1 includes:

[0014] Fix the linear motion mechanism to the ground or other platform, and adjust the displacement direction of the linear motion mechanism so that it is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or make the displacement direction of the linear motion mechanism parallel to the original displacement direction of the target or measuring point; install the microwave transceiver on the linear motion mechanism and adjust the beam direction toward the target or measuring point.

[0015] Alternatively, the microwave transceiver can be fixed on the ground or other platform, the beam direction can be adjusted to face the target or measuring point, and the target or measuring point can be made to have a known displacement by a linear motion mechanism. The displacement direction of the linear motion mechanism can be aligned with the microwave transceiver and perpendicular to the displacement direction of the target or measuring point, or the displacement direction of the linear motion mechanism can be parallel to the original displacement direction of the target or measuring point.

[0016] Preferably, step 1.2 includes: a microwave transceiver transmitting and receiving electromagnetic wave signals, and then moving a linear motion mechanism to generate an amplitude of The travel displacement is measured, and the baseband signals of each channel of the microwave transceiver are collected synchronously to extract the vibration or deformation displacement time series and information including peak values ​​of the target or measuring point.

[0017] Preferably, step 1.3 includes:

[0018] Based on relative motion, when a one-way or reciprocating relative displacement occurs between the microwave transceiver and the target or measuring point, the microwave transceiver is considered stationary. Therefore, the displacement is generated by the target or measuring point. Let this displacement be... when When the distance between the microwave transceiver and the target or measurement point is much smaller than the distance between the microwave transceiver and the target or measurement point, the measurement results of the microwave transceiver will be... Approximately equal to Line of sight of the microwave transceiver corresponding to the target or measurement point. Projection in direction The angle θ formed by the displacement direction of the microwave transceiver and the line of sight, and the angle φ formed by the displacement direction of the target or measuring point and the line of sight. q They are all approximately considered to remain unchanged.

[0019] When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is perpendicular to the original displacement direction of the target or measuring point, the included angle φ q It should be calculated as follows:

[0020]

[0021] In the formula, x1(iT) is the displacement time series of the target or measuring point obtained by the microwave transceiver in step 1.2. The displacement time sequence of the linear motion mechanism set in step 1.2, i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0022] When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, the included angle φ q It should be calculated as follows:

[0023]

[0024] In the formula, x(iT) is the displacement time series of the target or measuring point measured by the microwave transceiver obtained in step 1.2. The displacement time sequence of the linear motion mechanism set in step 1.2, i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0025] Preferably, step 2 includes: performing geometric conversion on the displacement time series of the target or measuring point, keeping the linear motion mechanism stationary, keeping the microwave transceiver stationary, with the orientation of the microwave transceiver consistent with step 1.1, then executing step 1.2, extracting the vibration or deformation displacement time series x2(iT) of the target or measuring point at this time, which is approximately considered to be the component of the actual displacement of the target or measuring point along the line of sight. This is the actual displacement time series of the target or measuring point after geometric transformation. It is calculated using x2(iT) and φ. q The true displacement time series of the target or measuring point is calculated. The expression is:

[0026]

[0027] The microwave vibration and deformation displacement measurement angle calibration system provided by the present invention includes:

[0028] Module M1: Uses a linear motion mechanism to generate a one-way or reciprocating relative displacement between the microwave transceiver and the target or measuring point. It extracts the vibration or deformation displacement time series of the target or measuring point and calculates the angle φ between the displacement direction of the target or measuring point and the line-of-sight direction. q Complete the calibration process;

[0029] Module M2: Keeping the microwave transceiver stationary, extract the vibration or deformation displacement time series of the target or measuring point again, and use the calibrated included angle φ q Geometric conversion is performed on this sequence to obtain the true displacement time series of the target or measuring point.

[0030] Preferably, the module M1 includes:

[0031] Module M1.1: Installs and arranges measuring equipment and generates single-stroke or reciprocating displacement based on a linear motion mechanism;

[0032] Module M1.2: Extracts the vibration or deformation displacement time series of the target or measuring point;

[0033] Module M1.3: Calculates the angle φ between the displacement direction of the target or measuring point and the line of sight of the microwave transceiver. q ;

[0034] The module M1.1 includes:

[0035] Fix the linear motion mechanism to the ground or other platform, and adjust the displacement direction of the linear motion mechanism so that it is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or make the displacement direction of the linear motion mechanism parallel to the original displacement direction of the target or measuring point; install the microwave transceiver on the linear motion mechanism and adjust the beam direction toward the target or measuring point.

[0036] Alternatively, the microwave transceiver can be fixed on the ground or other platform, the beam direction can be adjusted to face the target or measuring point, and the target or measuring point can be made to have a known displacement by a linear motion mechanism. The displacement direction of the linear motion mechanism can be aligned with the microwave transceiver and perpendicular to the displacement direction of the target or measuring point, or the displacement direction of the linear motion mechanism can be parallel to the original displacement direction of the target or measuring point.

[0037] Preferably, the module M1.2 includes: a microwave transceiver that transmits and receives electromagnetic wave signals, and then a linear motion mechanism that moves to generate an amplitude of The travel displacement is measured, and the baseband signals of each channel of the microwave transceiver are collected synchronously to extract the vibration or deformation displacement time series and information including peak values ​​of the target or measuring point.

[0038] Preferably, module M1.3 includes: based on the relative motion relationship, when a one-way or reciprocating relative displacement occurs between the microwave transceiver and the target or measuring point, the microwave transceiver is considered stationary, and the displacement is generated by the target or measuring point. Let this displacement be... when When the distance between the microwave transceiver and the target or measurement point is much smaller than the distance between the microwave transceiver and the target or measurement point, the measurement results of the microwave transceiver will be... Approximately equal to Line of sight of the microwave transceiver corresponding to the target or measurement point. Projection in direction The angle θ formed by the displacement direction of the microwave transceiver and the line of sight, and the angle φ formed by the displacement direction of the target or measuring point and the line of sight. q They are all approximately considered to remain unchanged.

[0039] When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is perpendicular to the original displacement direction of the target or measuring point, the included angle φ q It should be calculated as follows:

[0040]

[0041] In the formula, x1(iT) is the displacement time series of the target or measuring point obtained by the microwave transceiver in module M1.2. The displacement time sequence of the linear motion mechanism set in module M1.2, where i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0042] When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, the included angle φ q It should be calculated as follows:

[0043]

[0044] In the formula, x1(iT) is the displacement time series of the target or measuring point obtained by the microwave transceiver in module M1.2. The displacement time sequence of the linear motion mechanism set in module M1.2, where i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0045] Preferably, the module M2 includes:

[0046] Geometric conversion is performed on the displacement time series of the target or measuring point. The linear motion mechanism remains stationary, and the microwave transceiver is kept at rest, with its orientation aligned with module M1.1. Then, module M1.2 is called to extract the vibration or deformation displacement time series x2(iT) of the target or measuring point at this time. This is approximated as the component of the actual displacement of the target or measuring point along the line of sight. This is the actual displacement time series of the target or measuring point after geometric transformation. It is calculated using x2(iT) and φ. q The true displacement time series of the target or measuring point is calculated. The expression is:

[0047]

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] This invention calculates the angle between the target displacement direction and the microwave sensing line-of-sight direction by setting a known displacement and the displacement time series measured by the microwave transceiver. It overcomes the limitations of existing microwave vibration and deformation displacement measurement angle calibration, such as limited application scenarios, large errors, and inconvenient operation. It realizes accurate calibration of the angle between the microwave transceiver line of sight and the target displacement direction in complex outdoor working conditions such as long distance, high altitude, and complex structures. It improves the convenience and accuracy of microwave sensing-based vibration and deformation displacement measurement angle calibration in complex working conditions and solves the limitations of microwave vibration and deformation displacement measurement along the line-of-sight direction. Attached Figure Description

[0050] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0051] Figure 1 This is a flowchart of the method for calibrating the included angle between microwave vibration and deformation displacement measurement according to the present invention;

[0052] Figure 2 This is a three-dimensional scene diagram illustrating the angle calibration of microwave vibration and deformation displacement measurement, an embodiment of the present invention.

[0053] Figure 3 This is a schematic diagram of the calibration process for the angle calibration method of microwave vibration and deformation displacement measurement, which is an embodiment of the present invention.

[0054] Figure 4 This is a schematic diagram of the test process for the angle calibration method of microwave vibration and deformation displacement measurement, which is an embodiment of the present invention.

[0055] Figure 5 This is a block diagram of the microwave vibration and deformation displacement measurement angle calibration system of the present invention. Detailed Implementation

[0056] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. 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 fall within the protection scope of the present invention.

[0057] Example 1

[0058] like Figure 1 This invention provides a method for calibrating the angle between microwave vibration and deformation displacement measurements. First, a linear motion mechanism is used to generate a one-way or reciprocating relative displacement between the microwave transceiver and the target or measuring point. The vibration or deformation displacement time series of the target or measuring point is extracted, and the angle φ between the displacement direction of the target or measuring point and the line-of-sight direction is calculated.q Complete the calibration process; then, keeping the microwave transceiver stationary, extract the vibration or deformation displacement time series of the target or measuring point again, and use the included angle φ obtained from the calibration. q By performing geometric conversion on this sequence, the true displacement time series of the target under test is obtained.

[0059] The specific implementation steps are as follows:

[0060] Step 1, Calibration Process. Calibrate the scene to be measured, and calculate the angle φ between the displacement direction of the target or measuring point and the line of sight. q .

[0061] Step 1.1: Install and arrange the measuring equipment and generate single-pass or reciprocating relative displacement based on the linear motion mechanism.

[0062] Fix the linear motion mechanism to the ground or other platform, and adjust its displacement direction so that it is directly aligned with and perpendicular to the original displacement direction of the target or measuring point. Mount the microwave transceiver onto the linear motion mechanism, and adjust the beam direction towards the target or measuring point. Figure 2 As shown.

[0063] Step 1.2: Extract the filtered vibration or deformation displacement time series of the target or measuring point to be measured.

[0064] The microwave transceiver transmits and receives electromagnetic wave signals, and then moves a linear motion mechanism to generate an amplitude of The displacement, higher than the vibration frequency of the target or measuring point, is used to resolve interference caused by the target or measuring point being in an unstable state of displacement motion. Simultaneously, baseband signals from each channel's microwave transceiver are acquired, and the vibration or deformation displacement time series of the target or measuring point is extracted. Then, high-frequency displacement information of the linear motion mechanism is extracted through filtering. The filtering method for extracting high-frequency displacement information of the linear motion mechanism can be implemented using one or more methods combined, such as high-pass filtering, band-pass filtering, or peak extraction.

[0065] Step 1.3: Calculate the angle φ between the displacement direction of the target or measuring point and the line of sight. q .

[0066] After filtering out the low-frequency vibrations of the target or measuring point itself, the displacement time series of the target or measuring point extracted in step 1.2 only retains the displacement formed by the linear motion mechanism driving the microwave transceiver. For example... Figure 3 As shown, based on the relative motion relationship, if the microwave transceiver is considered stationary, then it can be seen that the target or measuring point has undergone displacement in the opposite direction of the linear motion mechanism. The measurement result of the microwave transceiver is the distance vector from the microwave transceiver to the target. The magnitude of the change, while the actual displacement of the target is when When the distance is much smaller than the distance between the microwave transceiver and the target or measurement point, Approximately equal to exist Projection in direction The angle θ formed by the direction of motion of the microwave transceiver and the line of sight can be approximated as constant. Because φ q The angle between θ and φ is complementary to each other. q It should be calculated as follows:

[0067]

[0068] In the formula, x1(iT) is the displacement time series of the target or measuring point obtained by the microwave transceiver in step 1.2. The displacement time sequence of the linear motion mechanism set in step 1.2, i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0069] Step 2, Testing Process. Perform geometric conversion on the displacement time series of the target or measuring point.

[0070] The linear motion mechanism remains stationary, keeping the microwave transceiver stationary, with its orientation consistent with step 1.1. Next, following the method in step 1.2, the vibration or deformation displacement time series x2(iT) of the target or measuring point at this point is extracted. This series can be approximated as the component of the actual displacement of the target or measuring point along the line of sight. This is the actual displacement time series of the target or measuring point after geometric transformation. For example... Figure 4 As shown, they have the following relationship:

[0071]

[0072] This is achieved through x2(iT) and φ q The true displacement time series of the target or measuring point was calculated.

[0073] Example 2

[0074] The present invention also provides an angle calibration system for microwave vibration and deformation displacement measurement. The angle calibration system for microwave vibration and deformation displacement measurement can be implemented by executing the process steps of the angle calibration method for microwave vibration and deformation displacement measurement. That is, those skilled in the art can understand the angle calibration method for microwave vibration and deformation displacement measurement as a preferred embodiment of the angle calibration system for microwave vibration and deformation displacement measurement.

[0075] The vibration and deformation displacement measurement angle calibration system based on microwave sensing provided by the present invention has the following system structure block diagram: Figure 5 As shown, it includes:

[0076] A microwave transceiver is used to transmit and receive electromagnetic wave signals and output multi-channel baseband signals.

[0077] Linear motion mechanism: Used for fixed connection with microwave transceiver or target / measuring point, so that microwave transceiver, target / measuring point produce displacement of known amplitude.

[0078] Signal acquisition module: Used to synchronously acquire multi-channel baseband signals output by the microwave transceiver and transmit them to the signal processing module.

[0079] Signal processing module: includes calibration submodule and test submodule.

[0080] The calibration submodule processes the vibration or deformation displacement time series obtained during the calibration process using multi-channel baseband signals, extracts pre-defined high-frequency displacement information of the linear motion mechanism, and calculates the angle φ between the displacement direction of the target or measuring point and the line of sight based on the displacement time series obtained during the calibration process using module M1.3. q ;

[0081] The processing content of the test submodule includes calculating the vibration or deformation displacement time series of the target or measuring point under test based on the multi-channel baseband signal obtained during the test, and using the included angle φ q The displacement time series during the test process is geometrically converted by module M2 to obtain the actual vibration or deformation displacement time series of the target or measuring point.

[0082] Display and save module: Used to display or save the vibration displacement time series of the measured target and the calculated included angle φ. q Displacement time series after geometric conversion and other intermediate processing information.

[0083] Control unit: Used to control the reciprocating frequency and amplitude of the linear motion mechanism, as well as to control the microwave transceiver to transmit and receive electromagnetic waves.

[0084] The system operation process is as follows:

[0085] Module M1: Uses a linear motion mechanism to generate a one-way or reciprocating relative displacement between the microwave transceiver and the target or measuring point. It extracts the vibration or deformation displacement time series of the target or measuring point and calculates the angle φ between the displacement direction of the target or measuring point and the line-of-sight direction. q Complete the calibration process;

[0086] Module M2: Keeping the microwave transceiver stationary, extract the vibration or deformation displacement time series of the target or measuring point again, and use the calibrated included angle φ q Geometric conversion is performed on this sequence to obtain the true displacement time series of the target or measuring point.

[0087] The module M1 includes:

[0088] Module M1.1: Installs and arranges measuring equipment and generates single-stroke or reciprocating displacement based on a linear motion mechanism;

[0089] Module M1.2: Extracts the vibration or deformation displacement time series of the target or measuring point;

[0090] Module M1.3: Calculates the angle φ between the displacement direction of the target or measuring point and the line of sight of the microwave transceiver. q ;

[0091] The module M1.1 includes:

[0092] Fix the linear motion mechanism to the ground or other platform, and adjust the displacement direction of the linear motion mechanism so that it is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or make the displacement direction of the linear motion mechanism parallel to the original displacement direction of the target or measuring point; install the microwave transceiver on the linear motion mechanism and adjust the beam direction toward the target or measuring point.

[0093] Alternatively, the microwave transceiver can be fixed on the ground or other platform, the beam direction can be adjusted to face the target or measuring point, and the target or measuring point can be made to have a known displacement by a linear motion mechanism. The displacement direction of the linear motion mechanism can be aligned with the microwave transceiver and perpendicular to the displacement direction of the target or measuring point, or the displacement direction of the linear motion mechanism can be parallel to the original displacement direction of the target or measuring point.

[0094] The module M1.2 includes: a microwave transceiver that transmits and receives electromagnetic wave signals, and then a linear motion mechanism that moves to generate an amplitude of The travel displacement is measured, and the baseband signals of each channel of the microwave transceiver are collected synchronously to extract the vibration or deformation displacement time series and information including peak values ​​of the target or measuring point.

[0095] The module M1.3 includes: based on the relative motion relationship, when a one-way or reciprocating relative displacement occurs between the microwave transceiver and the target or measuring point, the microwave transceiver can be considered stationary, and the displacement is generated by the target or measuring point. Let this displacement be... when When the distance between the microwave transceiver and the target or measurement point is much smaller than the distance between the microwave transceiver and the target or measurement point, the measurement results of the microwave transceiver will be... Approximately equal to Line of sight of the microwave transceiver corresponding to the target or measurement point. Projection in direction The angle θ formed by the displacement direction of the microwave transceiver and the line of sight, and the angle φ formed by the displacement direction of the target or measuring point and the line of sight. q All can be approximated as unchanged.

[0096] When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is perpendicular to the original displacement direction of the target or measuring point, the included angle φ q It should be calculated as follows:

[0097]

[0098] In the formula, x1(iT) is the displacement time series of the target or measuring point obtained by the microwave transceiver in module M1.2. The displacement time sequence of the linear motion mechanism set in module M1.2, where i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0099] When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, the included angle φ q It should be calculated as follows:

[0100]

[0101] In the formula, x1(iT) is the displacement time series of the target or measuring point obtained by the microwave transceiver in module M1.2. The displacement time sequence of the linear motion mechanism set in module M1.2, where i = 1, 2, ... are the sweep frequency cycle numbers, and T is the time of a single sweep frequency cycle.

[0102] The module M2 includes:

[0103] Geometric conversion is performed on the displacement time series of the target or measuring point. The linear motion mechanism remains stationary, and the microwave transceiver is kept at rest, with its orientation aligned with module M1.1. Then, module M1.2 is called to extract the vibration or deformation displacement time series x2(iT) of the target or measuring point at this time. This is approximated as the component of the actual displacement of the target or measuring point along the line of sight. This is the actual displacement time series of the target or measuring point after geometric transformation. It is calculated using x2(iT) and φ. q The true displacement time series of the target or measuring point is calculated. The expression is:

[0104]

[0105] Those skilled in the art will understand that, in addition to implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules included therein for implementing various programs can also be considered structures within the hardware component; alternatively, modules for implementing various functions can be considered both software programs implementing the method and structures within the hardware component.

[0106] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for calibrating the angle between microwave vibration and deformation displacement measurement, characterized in that, include: Step 1: A linear motion mechanism is used to generate a one-way or reciprocating relative displacement between the microwave transceiver and the target or measuring point. The vibration or deformation displacement time series of the target or measuring point is extracted. Based on the extracted displacement time series and the generated relative displacement, the included angle is calculated. Complete the calibration process; Step 2: Keep the microwave transceiver stationary, and extract the vibration or deformation displacement time series of the target or measuring point again. Use the included angle obtained from the calibration. Geometric conversion is performed on this sequence to obtain the true displacement time series of the target or measuring point.

2. The method for calibrating the included angle of microwave vibration and deformation displacement measurement according to claim 1, characterized in that, Step 1 includes: Step 1.1: Install and arrange the measuring equipment and generate single-stroke or reciprocating relative displacement based on the linear motion mechanism; Step 1.2: Extract the vibration or deformation displacement time series of the target or measuring point; Step 1.3: Calculate the angle between the displacement direction of the target or measuring point and the line of sight of the microwave transceiver. ; Step 1.1 includes: Fix the linear motion mechanism to the ground or other platform, and adjust the displacement direction of the linear motion mechanism so that it is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or make the displacement direction of the linear motion mechanism parallel to the original displacement direction of the target or measuring point; install the microwave transceiver on the linear motion mechanism and adjust the beam direction toward the target or measuring point. Alternatively, the microwave transceiver can be fixed on the ground or other platform, the beam direction can be adjusted to face the target or measuring point, and the target or measuring point can be made to have a known displacement by a linear motion mechanism. The displacement direction of the linear motion mechanism can be aligned with the microwave transceiver and perpendicular to the displacement direction of the target or measuring point, or the displacement direction of the linear motion mechanism can be parallel to the original displacement direction of the target or measuring point.

3. The method for calibrating the included angle between microwave vibration and deformation displacement measurement according to claim 2, characterized in that, Step 1.2 includes: the microwave transceiver transmitting and receiving electromagnetic wave signals, and then moving the linear motion mechanism to generate an amplitude of The travel displacement is measured, and the baseband signals of each channel of the microwave transceiver are collected synchronously to extract the vibration or deformation displacement time series and information including peak values ​​of the target or measuring point.

4. The method for calibrating the included angle between microwave vibration and deformation displacement measurement according to claim 3, characterized in that, Step 1.3 includes: Based on the relative motion relationship, when a one-way or reciprocating relative displacement occurs between the microwave transceiver and the target or measuring point, the microwave transceiver is considered stationary. Therefore, the displacement is generated by the target or measuring point. Let this displacement be... ;when When the distance between the microwave transceiver and the target or measurement point is much smaller than the distance between the microwave transceiver and the target or measurement point, the measurement results of the microwave transceiver will be... Approximately equal to Line of sight of the microwave transceiver corresponding to the target or measurement point. Projection in direction The angle θ formed by the displacement direction of the microwave transceiver and the line of sight, and the angle formed by the displacement direction of the target or measuring point and the line of sight. They are all approximately considered to remain unchanged; When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is perpendicular to the original displacement direction of the target or measuring point, the included angle... It should be calculated as follows: In the formula, This refers to the displacement time series of the target or measuring point obtained by the microwave transceiver in step 1.

2. This refers to the displacement-time sequence of the linear motion mechanism set in step 1.

2. i =1,2,… represents the sweep frequency cycle number. T The time of a single frequency sweep cycle; When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, the included angle... It should be calculated as follows: 。 5. The method for calibrating the included angle between microwave vibration and deformation displacement measurement according to claim 4, characterized in that, Step 2 includes: performing geometric conversion on the displacement time series of the target or measuring point, keeping the linear motion mechanism stationary, keeping the microwave transceiver stationary with the orientation of the microwave transceiver consistent with step 1.1, and then executing step 1.2 to extract the vibration or deformation displacement time series of the target or measuring point at this time. It is approximately considered to be the component of the actual displacement of the target or measuring point along the line of sight. The true displacement time series of the target or measuring point after geometric transformation is obtained through... and The true displacement time series of the target or measuring point is calculated. The expression is: 。 6. A system for calibrating the included angle of microwave vibration and deformation displacement measurement, characterized in that, include: Module M1: Through a linear motion mechanism, a one-way or reciprocating relative displacement is generated between the microwave transceiver and the target or measuring point. The vibration or deformation displacement time series of the target or measuring point is extracted. Based on the extracted displacement time series and the relative displacement generated, the included angle φq is calculated to complete the calibration process. Module M2: Keeping the microwave transceiver stationary, extract the vibration or deformation displacement time series of the target or measurement point again, and use the calibrated included angle. Geometric conversion is performed on this sequence to obtain the true displacement time series of the target or measuring point.

7. The microwave vibration and deformation displacement measurement angle calibration system according to claim 6, characterized in that, The module M1 includes: Module M1.1: Installs and arranges measuring equipment and generates single-stroke or reciprocating displacement based on a linear motion mechanism; Module M1.2: Extracts the vibration or deformation displacement time series of the target or measuring point; Module M1.3: Calculates the angle between the displacement direction of the target or measuring point and the line of sight of the microwave transceiver. ; The module M1.1 includes: Fix the linear motion mechanism to the ground or other platform, and adjust the displacement direction of the linear motion mechanism so that it is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or make the displacement direction of the linear motion mechanism parallel to the original displacement direction of the target or measuring point; install the microwave transceiver on the linear motion mechanism and adjust the beam direction toward the target or measuring point. Alternatively, the microwave transceiver can be fixed on the ground or other platform, the beam direction can be adjusted to face the target or measuring point, and the target or measuring point can be made to have a known displacement by a linear motion mechanism. The displacement direction of the linear motion mechanism can be aligned with the microwave transceiver and perpendicular to the displacement direction of the target or measuring point, or the displacement direction of the linear motion mechanism can be parallel to the original displacement direction of the target or measuring point.

8. The microwave vibration and deformation displacement measurement angle calibration system according to claim 7, characterized in that, The module M1.2 includes: a microwave transceiver that transmits and receives electromagnetic wave signals, and then a linear motion mechanism that moves to generate an amplitude of The travel displacement is measured, and the baseband signals of each channel of the microwave transceiver are collected synchronously to extract the vibration or deformation displacement time series and information including peak values ​​of the target or measuring point.

9. The microwave vibration and deformation displacement measurement angle calibration system according to claim 8, characterized in that, The module M1.3 includes: based on the relative motion relationship, when a one-way or reciprocating relative displacement occurs between the microwave transceiver and the target or measuring point, the microwave transceiver is considered stationary, and the displacement is generated by the target or measuring point. Let this displacement be... ;when When the distance between the microwave transceiver and the target or measurement point is much smaller than the distance between the microwave transceiver and the target or measurement point, the measurement results of the microwave transceiver will be... Approximately equal to Line of sight of the microwave transceiver corresponding to the target or measurement point. Projection in direction The angle θ formed by the displacement direction of the microwave transceiver and the line of sight, and the angle formed by the displacement direction of the target or measuring point and the line of sight. They are all approximately considered to remain unchanged; When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is directly opposite to and perpendicular to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is perpendicular to the original displacement direction of the target or measuring point, the included angle... It should be calculated as follows: In the formula, This refers to the displacement time series of the target or measurement point obtained from the microwave transceiver in module M1.

2. The displacement-time sequence of the linear motion mechanism set in module M1.

2. i =1,2,… represents the sweep frequency cycle number. T The time of a single frequency sweep cycle; When the linear motion mechanism drives the microwave transceiver to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, or when the linear motion mechanism drives the target or measuring point to move and the displacement direction is parallel to the original displacement direction of the target or measuring point, the included angle... It should be calculated as follows: 。 10. The microwave vibration and deformation displacement measurement angle calibration system according to claim 9, characterized in that, Module M2 includes: performing geometric conversion on the displacement time series of the target or measuring point, keeping the linear motion mechanism stationary, keeping the microwave transceiver stationary with its orientation aligned with module M1.1, and then calling module M1.2 to extract the vibration or deformation displacement time series of the target or measuring point at this time. It is approximately considered to be the component of the actual displacement of the target or measuring point along the line of sight. The true displacement time series of the target or measuring point after geometric transformation is obtained through... and The true displacement time series of the target or measuring point is calculated. The expression is: 。

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