Portable Arc-Scanning Micro-Variation Monitoring Radar Fast Imaging Method and Device

Abstract

The present disclosure relates to a rapid imaging method and device for a portable arc-scanning micro-variation monitoring radar. The method includes obtaining radar monitoring signals received within an arc-scanning range, where the radar monitoring signals carry rotation angle information; performing range compression on the radar monitoring signals to obtain corresponding range-compressed signals; performing compensation processing on the range-compressed signals based on a constructed signal space residual to obtain compensated radar signals; and performing image reconstruction on the compensated radar signals using a multi-level reconstruction strategy to obtain radar images. The embodiments of the present disclosure have the advantages of high accuracy and saving the consumption of system internal resources.

Description

Technical Field

[0001] The present disclosure relates to the field of radar image processing, and in particular to a fast imaging method and device for a portable arc-scanning micro-variation monitoring radar. Background Art

[0002] The micro-variation monitoring radar takes radar technology as the core and is based on the principles of synthetic aperture radar (SAR) and interferometric / differential interferometric radar (InSAR / DInSAR) to achieve surface displacement monitoring and early warning of various geological bodies / structures. It can be widely applied to fields such as geological hazard points, emergency monitoring, open-pit mines, water conservancy projects, railway slopes, wind power towers, bridges, etc., to achieve the safety guarantee of various geological bodies and major projects.

[0003] One of the most critical links in the micro-variation monitoring radar system is imaging. Generally, the actual system is designed based on the synthetic aperture radar imaging principle, and the method adopted is generally the back-projection imaging method. However, this method has low efficiency and large computational amount, which is not conducive to improving the overall operation rate and resource consumption of the system. Therefore, a fast imaging method needs to be incorporated into the system. Currently, most of them use the Doppler distance imaging and frequency domain processing methods for imaging, but this method is more applicable in the linear track array system, and has a large error and a high defocus degree of the imaging effect for the special array arrangement format of the arc array. Therefore, researchers have tried to develop an imaging method with high accuracy and low internal resource consumption of the system. Summary of the Invention

[0004] The present disclosure provides a fast imaging method, device and system for a portable arc-scanning micro-variation monitoring radar. The present disclosure has the advantages of high accuracy and low internal resource consumption of the system.

[0005] According to one aspect of the present disclosure, there is provided a fast imaging method for a portable arc-scanning micro-variation monitoring radar, which includes:

[0006] Obtaining radar monitoring signals received within the arc scanning range, the radar monitoring signals carrying rotation angle information;

[0007] Performing range compression on the radar monitoring signals to obtain corresponding range-compressed signals;

[0008] Performing compensation processing on the range-compressed signals based on the constructed signal space residual to obtain compensated radar signals;

[0009] Performing image reconstruction on the compensated radar signals using a multi-level reconstruction strategy to obtain radar images.

[0010] In some possible implementation manners, the obtaining of the radar monitoring signals received within the arc scanning range includes:

[0011] Control the radar to rotate within a preset angle range according to a preset angle and send a radar transmission signal;

[0012] Receive radar echo signals corresponding to the radar transmission signals at each preset angle;

[0013] Determine the radar monitoring signal according to the radar echo signals at each preset angle.

[0014] In some possible implementation manners, the method further includes: performing preprocessing on the radar echo signal to obtain the radar monitoring signal;

[0015] Perform mixing processing on the received radar echo signal to obtain an intermediate frequency signal;

[0016] Perform redundant phase compensation processing on the intermediate frequency signal to obtain a phase compensation signal;

[0017] Determine the radar monitoring signal according to the phase compensation signal and the angle corresponding to the radar echo signal.

[0018] In some possible implementation manners, the performing range compression on the radar monitoring signal to obtain a corresponding range compression signal includes:

[0019] Use a cosine window to suppress the signal side lobe of the radar monitoring signal to obtain a first signal;

[0020] Perform inverse Fourier transform on the first signal to obtain a second signal;

[0021] Determine the peak point position of the second signal, and adjust the gradient of the second signal according to the peak point position to obtain the range compression signal.

[0022] In some possible implementation manners, the performing compensation processing on the range compression signal based on the constructed signal space residual to obtain a compensated radar signal includes:

[0023] Construct a signal space residual according to a preset principle;

[0024] Obtain the compensated radar signal according to the product of the signal space residual and the range compression signal.

[0025] In some possible implementation manners, the performing image reconstruction on the compensated radar signal by using a multi-level reconstruction strategy to obtain a radar image includes:

[0026] Construct a primary reconstruction image and a q-th level reconstruction image in sequence according to the compensated radar signal, where q is an integer greater than zero and less than Q, and Q is the total number of reconstruction levels;

[0027] Perform an addition process on the primary reconstructed image to the Q-level reconstructed image to obtain the final radar image.

[0028] According to a second aspect of the present disclosure, there is provided a portable arc-scanning micro-variation monitoring radar fast imaging device, comprising:

[0029] An acquisition module, configured to acquire radar monitoring signals received within an arc-scanning range, where the radar monitoring signals carry rotation angle information;

[0030] A range compression module, configured to perform range compression on the radar monitoring signals to obtain corresponding range-compressed signals;

[0031] A compensation module, configured to perform compensation processing on the range-compressed signals based on the constructed signal space residue to obtain compensated radar signals;

[0032] A reconstruction module, configured to perform image reconstruction on the compensated radar signals using a multi-level reconstruction strategy to obtain radar images.

[0033] According to a third aspect of the present disclosure, there is provided a portable arc-scanning micro-variation monitoring radar fast imaging device, comprising:

[0034] An antenna subsystem, configured to transmit radar emission signals and receive corresponding radar monitoring signals;

[0035] A signal processing system, configured to process the radar monitoring signals to reconstruct radar images;

[0036] A rotation subsystem, configured to rotate according to received instructions and drive the antenna subsystem to rotate within a preset angle range;

[0037] A control subsystem, configured to transmit rotation instructions to the rotation subsystem to control the rotation subsystem to rotate within an angle range not greater than the preset angle range.

[0038] According to a fourth aspect of the present disclosure, there is provided an electronic device, characterized by comprising:

[0039] A processor;

[0040] A memory for storing instructions executable by the processor;

[0041] Wherein, the processor is configured to call the instructions stored in the memory to execute the method according to any one of the first aspect.

[0042] According to a fifth aspect of the present disclosure, there is provided a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method according to any one of the first aspect is implemented.

[0043] In the embodiments of the present disclosure, by obtaining the radar monitoring signals received within the arc scanning range and performing range compression and compensation processing on the radar monitoring signals, compensated radar signals are obtained. Then, an image reconstruction is performed using a multi-level reconstruction strategy, and finally, a radar image is obtained. Among them, by processing the radar monitoring signals with angle information within the arc scanning range (preset angle range), accurate radar images can be collected in the case of obstruction of the received signal or the transmitted signal. In addition, the image accuracy can be further improved through multi-level reconstruction.

[0044] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure.

[0045] According to the following detailed description of exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present disclosure will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification. These drawings show embodiments consistent with the present disclosure and are used together with the specification to explain the technical solutions of the present disclosure.

[0047] Figure 1 A flowchart showing a method for rapid imaging of a portable arc scanning micro-variation monitoring radar according to an embodiment of the present disclosure;

[0048] Figure 2 A schematic structural diagram showing a device for rapid imaging of a portable arc scanning micro-variation monitoring radar according to an embodiment of the present disclosure;

[0049] Figure 3 A flowchart showing range compression processing according to an embodiment of the present disclosure;

[0050] Figure 4 A flowchart showing image reconstruction according to an embodiment of the present disclosure;

[0051] Figure 5 A block diagram showing a device for rapid imaging of a portable arc scanning micro-variation monitoring radar according to an embodiment of the present disclosure;

[0052] Figure 6 A block diagram showing an electronic device 800 according to an embodiment of the present disclosure;

[0053] Figure 7 A block diagram showing an electronic device 1900 according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0055] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" herein is not necessarily to be construed as superior or better than other embodiments.

[0056] As used herein, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" as used herein means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set composed of A, B, and C.

[0057] In addition, for a better illustration of the present disclosure, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present disclosure can also be implemented without some specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail so as to highlight the gist of the present disclosure.

[0058] The execution subject of the fast imaging method of the portable arc scanning micro-variation monitoring radar according to an embodiment of the present disclosure can be any radar signal processing device. For example, the fast imaging method of the portable arc scanning micro-variation monitoring radar can be executed by a terminal device, a server, or other processing devices. Among them, the terminal device can be a user equipment (UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital assistant (PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. In some possible implementation manners, the fast imaging method of the portable arc scanning micro-variation monitoring radar can also be implemented by a processor calling computer-readable instructions stored in a memory.

[0059] It can be understood that, without violating the principle logic, the above-mentioned various method embodiments mentioned in the present disclosure can be combined with each other to form a combined embodiment. Due to space limitations, the present disclosure will not elaborate further.

[0060] Figure 1 The flowchart showing the fast imaging method of the portable arc scanning micro-variation monitoring radar according to an embodiment of the present disclosure is as Figure 1As shown, the fast imaging method of the portable arc-scanning micro-variation monitoring radar includes:

[0061] S10: Obtain the radar monitoring signals received within the arc-scanning range, where the radar monitoring signals carry rotation angle information;

[0062] S20: Perform range compression on the radar monitoring signals to obtain corresponding range-compressed signals;

[0063] S30: Perform compensation processing on the range-compressed signals based on the constructed signal space residue to obtain compensated radar signals;

[0064] S40: Use a multi-level reconstruction strategy to perform image reconstruction on the compensated radar signals to obtain radar images.

[0065] The radar in the embodiments of the present disclosure is a micro-variation monitoring radar. The micro-variation monitoring radar system is applied to stability safety monitoring and can achieve real-time automatic monitoring with all-day, all-weather, large range (fully covering within 5 kilometers), and high precision (sub-millimeter displacement monitoring accuracy), so as to realize the analysis and early warning of slope stability. The specific features are as follows: (1). All-day, all-weather: 24 hours, all climate conditions; (2). Large range: Can implement surface monitoring and provide a full-field micro-deformation view; (3). High precision: Sub-millimeter displacement monitoring accuracy; (4). Non-contact: Belongs to non-contact measurement and remote sensing monitoring, without deploying any cooperation targets; (5). Long distance: The maximum monitoring distance can reach 5 kilometers; (6). Automatic monitoring: Unattended, with 24-hour continuous monitoring; (7). The entire process of data collection, result generation, deformation analysis, and early warning and forecasting is fully automated.

[0066] Figure 2Schematic diagram showing the structure of a portable arc-scanning micro-variation monitoring radar fast imaging device according to an embodiment of the present disclosure, which includes an antenna subsystem 10, a signal processing system 20, a rotation subsystem 30, and a control subsystem 40. Among them, the antenna subsystem 10 includes wide-beam dual horn antennas placed side by side. The ends of the two antennas are connected to a micro turntable (rotation subsystem 30) through structural design, and it is controlled by the control subsystem 40 to flexibly adjust the beam direction of the antenna; and the initial orientation and rotation speed value can be set through the control subsystem 40 to cooperate with the rotation subsystem, and then flexibly adjust the strategy according to the observation requirements of the scene. The signal processing system 20 is used to send radar emission signals through the antenna, and receive and process radar echo signals to obtain radar monitoring signals with rotation angle information. The rotation subsystem 30 is rotated by the control subsystem 40, and drives the antenna subsystem 10 and the signal processing system 30 installed thereon to rotate, so as to realize rotation within a preset angle range and receive radar monitoring signals. The control subsystem 40 mainly controls the radar to transmit and receive signals, and controls the rotation subsystem to rotate a fixed angle and the rotation of the micro turntable at the end of the antenna.

[0067] In an embodiment of the present disclosure, the obtaining of the radar monitoring signals received within the arc-scanning range includes: controlling the radar to rotate at a preset angle within a preset angle range and sending radar emission signals; receiving the radar echo signals corresponding to the radar emission signals at each preset angle; and determining the radar monitoring signals according to the radar echo signals at each preset angle.

[0068] In an embodiment of the present disclosure, the rotation subsystem can be controlled to drive the antenna to rotate within a preset angle range, and the antenna subsystem can be controlled to send radar signals at preset angle intervals, and then receive radar echo signals at corresponding angles. The signal processing system adopts a frequency-modulated continuous wave (FMCW) operating system, and emits a frequency-modulated continuous wave signal S tr , that is:

[0069]

[0070] where f c is the system operating frequency, t is the range-time variable, and t ∈ [-T r / 2, T r / 2], T r is the signal duration, K r is the signal frequency modulation rate, the signal bandwidth is B r = K r T r , j represents the imaginary part, and exp represents the power with e as the base.

[0071] The corresponding radar echo signal S r (t) can be expressed as:

[0072]

[0073] Among them, R P is the distance from the target point in the scene to the antenna aperture plane, and C is the speed of light.

[0074] In the case of obtaining the radar echo signals at each angle, the radar echo signals can be preprocessed. This preprocessing process includes: performing mixing processing on the received radar echo signals to obtain intermediate-frequency signals; performing redundant phase compensation processing on the intermediate-frequency signals to obtain phase compensation signals; and determining the radar monitoring signals according to the phase compensation signals and the angles corresponding to the radar echo signals.

[0075] Specifically, in the embodiments of the present disclosure, a downconverter is used to perform mixing processing on the radar echo signals, and the obtained intermediate-frequency signal is S IF (t):

[0076]

[0077] Then, redundant phase compensation processing is performed on the obtained intermediate-frequency signals to obtain phase compensation signals. After redundant phase compensation, the signal S IF_RVP (t) expression is:

[0078]

[0079] Among them, pi is π.

[0080] In the case of obtaining the phase compensation signals of the radar echo signals at each angle, the radar monitoring signals with angle directions can be obtained by using the phase compensation signals at each angle. Let the rotation angle of the rotor subsystem be θ n ; the value range of n is generally [0, N], and N is the total number of angle-direction sampling points; rotating with a radius γ centered on the rotor subsystem, and assuming the coordinates of the point target P in the scene are (ρ p , θ p ), where ρ p is the distance from the target point in the scene to the center of the turntable, and θ p is the included angle between the target P in the scene and the initial orientation of the turntable to the center of the turn. Then, the distance from the target point P in the scene to each sampling point on the circle with a radius γ is shown in the following formula:

[0081]

[0082] Since this expression contains square roots and cosine terms, it is difficult to directly process; therefore, this expression is expanded and approximated, approximated by the conditions of Taylor and the distance from the target to the antenna being much greater than the rotation radius, and its expression is:

[0083]

[0084] Where: R0 represents the shortest distance from the target p point to the sampling point of the turntable.

[0085] Therefore, the expression of the radar monitoring signal with the rotation angle is:

[0086]

[0087] In the case of obtaining the radar monitoring signal with the rotation angle, the signals in each angle direction can be stored and arranged in data according to the following form:

[0088]

[0089] Where, Δθ is a preset angle interval.

[0090] In the case of obtaining the radar monitoring signal, range compression processing can be performed on the radar monitoring signal. Figure 3 The flowchart showing the range compression processing according to an embodiment of the present disclosure, where performing range compression on the radar monitoring signal to obtain a corresponding range-compressed signal includes:

[0091] S21: Using a cosine window to suppress the signal sidelobe of the radar monitoring signal to obtain a first signal;

[0092] S22: Performing an inverse Fourier transform on the first signal to obtain a second signal;

[0093] S23: Determining the peak point position of the second signal, and adjusting the gradient of the second signal according to the peak point position to obtain the range-compressed signal.

[0094] First, perform cosine window processing on the radar monitoring signal to suppress the signal sidelobe, and then perform an inverse Fourier transform IFFT. The cosine window is expressed as Where u = [1, D], D represents the total length of the window function, which is the same as the number of other signal acquisition points, D represents the effective length of the window function, and β represents a constant;

[0095] Using the product of the radar monitoring signal and the cosine window, and performing an IFFT transform on the product result to obtain a first signal. This process is expressed as:

[0096]

[0097] After obtaining the first signal, for the first signal S IFFT (t,θ nIn the case of [[ID=]], further determine the position of the local peak point. Among them, the local peak point is also the position where the target p is located. After step S21, a one-dimensional range profile will be formed. To find and determine the specific peak point position, the specific operation process includes: subtract adjacent elements of the one-dimensional matrix corresponding to the first signal at each angle. The signal S IFFT (t, θ n ) After the above processing, the data is saved as a one-dimensional matrix. After subtracting adjacent matrix values, it is input into the sign function. The sign function sets elements greater than 0 to 1, elements less than 0 to -1, and elements equal to 0 to 0. Then subtract adjacent values again for the output one-dimensional matrix, and finally find the matrix index number equal to 2, which is the peak point position to be recorded. Through the above method, the peak points of the first signal corresponding to all angles can be determined.

[0098] In the case of determining the peak points of the first signal, the gradient curves on both sides of the peak points can be adjusted to obtain the second signal. In the embodiments of the present disclosure, range compression is achieved by increasing the target line gradient; according to the determined peak points, calculate the gradients of the curve values showing a downward trend on both sides of the peak point position, and expand the original gradient value by v times with the peak point as the center. The value of v is generally about 2 - 3. After completing the above operations, a one-dimensional range image S with low sidelobes can be obtained IFFT_grad (t, θ n ).

[0099] In the case of obtaining the range-compressed signal, angle compression can be continued to obtain the final radar image. First, the embodiments of the present disclosure perform spatial residual compensation on the range-compressed signal. Among them, compensating the range-compressed signal based on the constructed signal spatial residual amount to obtain a compensated radar signal includes: constructing a signal spatial residual amount according to a preset principle; obtaining the compensated radar signal according to the product of the signal spatial residual amount and the range-compressed signal. Among them, constructing the signal spatial residual amount is:

[0100]

[0101] Among them, f m = K r * t, discretize the range-time variable t into Among them, f s is the sampling rate; m is the number of sampling points on the time axis of the range signal, and its value range is [0, M].

[0102] Then multiply the one-dimensional range-compressed signal S IFFT_grad (t, θ) by the signal spatial residual amount to complete the compensation and obtain the compensated radar signal. The specific process is expressed as:

[0103] S if_com (t, θn ) = S if_com (t, θ n ) * S left (f m , θ n ) (11)

[0104] Furthermore, the compensated radar signal can be subjected to multi - level reconstruction to obtain the final radar image. Figure 4 The flowchart of image reconstruction according to an embodiment of the present disclosure is shown. Among them, performing image reconstruction on the compensated radar signal by using a multi - level reconstruction strategy to obtain a radar image includes:

[0105] S41: Sequentially construct a primary reconstruction image and a q - th level reconstruction image according to the compensated radar signal, where q is an integer greater than zero and less than Q, and Q is the total number of reconstruction levels;

[0106] S42: Perform an addition process on the primary reconstruction image to the Q - th level reconstruction image to obtain the final radar image.

[0107] In the embodiment of the present disclosure, the compensated radar signal can be subjected to multi - level reconstruction. The number of reconstruction levels is set to Q, and Q generally takes values of power - of - 2 terms, such as 4, 8, etc. The present disclosure does not make specific limitations on this. Among them, according to the expression of traditional radar imaging Substituting formula (6) into the above formula and simplifying it, the expression for constructing the primary reconstruction image is:

[0108]

[0109] where f m = f c + K r * t; Discretize the range - direction time variable t as t = 0, where f s is the sampling rate; m is the number of sampling points on the range - direction signal time axis, and its value range is 0 to M; nn's value range is [0, NN], representing the number of accumulations. In the embodiment of the present disclosure, NN can be 100, but this is not a specific limitation of the present disclosure.

[0110] This formula can be simplified and equivalent to:

[0111]

[0112] The process of constructing the remaining levels (the q - th level) of the image is:

[0113]

[0114] Perform an addition process on the first q levels of reconstruction images to obtain the q - th level reconstruction image I q_total = I1] q_total + Iq When q == Q, that is, the loop ends, I q_total is the finally synthesized radar image; when q < Q, continue to obtain the (q + 1)-level reconstructed image and repeat the above process until q == Q is satisfied to obtain the final radar image.

[0115] Based on the above configuration, embodiments of the present disclosure can utilize radar monitoring signals at each angular interval within a preset angular range to obtain a radar reconstructed image. This process integrates multi-level radar images and improves the accuracy of the radar image.

[0116] In addition, in some other embodiments of the present disclosure, embodiments of the present disclosure can control the combined reconstruction of radar images in two directions to obtain the final radar image.

[0117] Specifically, embodiments of the present disclosure may further include:

[0118] S101: Control the antenna subsystem to rotate within a first preset angular range to the left, and obtain a first radar image to the left through the portable arc scanning micro-variation monitoring radar fast imaging method described in the above embodiments;

[0119] S102: Control the antenna subsystem to rotate within a second preset angular range to the right, and obtain a second radar image to the right through the portable arc scanning micro-variation monitoring radar fast imaging method described in the above embodiments;

[0120] S103: Perform image stitching and replacement processing on the first radar image and the second radar image to obtain a radar image within a preset angular range.

[0121] Among them, the preset angular range is smaller than the combined range of the first preset angle and the second preset angle.

[0122] This device is placed in a field environment during actual application. Due to the harsh external environment, to ensure the long-term stable operation of the device, it needs to be placed inside an observation room. In this way, a small window needs to be opened in the observation room to enable it to radiate signals to the scene, which limits the rotation range of the device, resulting in an inevitable situation where there is always a part of the area in the scene that belongs to a non-full synthetic aperture illumination area. Therefore, the antenna subsystem needs to be designed as described above to compensate for such defects; implementing this function requires setting a control strategy.

[0123] Specifically, the control subsystem 40 can control the rotation subsystem 30 connected to the antenna subsystem 10 to make it parallel to the ray of a circle with a radius of γ, and control the signal processing system to collect data for processing to obtain radar imaging. In embodiments of the present disclosure, first, control the aperture orientation of the antenna subsystem to always scan to the left, and set the left deviation angle θ 左 , and the set value is where θ 主 is the main lobe width of the antenna. The control subsystem controls the rotation subsystem and runs the signal processing module for imaging processing to obtain the first radar image with the antenna tilted to the left. Secondly, the aperture orientation of the antenna subsystem is controlled to always scan to the right, and the right tilt angle θ 右 is designed, and the set value is Furthermore, the second radar image with the antenna tilted to the right is obtained. Then, the splicing and replacement processing of the first radar image and the second radar image is performed, and the first radar image and the second radar image are intercepted for the image data in the ranges of 0 to θ 左 and θ max -θ 右 to θ max where θ max is the maximum angle range of the observation scene, and then the radar image is obtained.

[0124] Based on the above configuration, the embodiments of the present disclosure can combine the imaging fusions of the angles in two directions to obtain the final radar image, further improving the accuracy of the radar image.

[0125] Those skilled in the art can understand that in the above method of the specific implementation manner, the writing order of each step does not mean a strict execution order and constitutes any limitation on the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0126] In addition, the present disclosure also provides a portable arc scanning micro-variation monitoring radar fast imaging device, an electronic device, a computer-readable storage medium, and a program. The above can all be used to implement any one of the portable arc scanning micro-variation monitoring radar fast imaging methods provided by the present disclosure. The corresponding technical solutions and descriptions are referred to the corresponding records in the method part and will not be repeated.

[0127] Figure 5 The block diagram showing the portable arc scanning micro-variation monitoring radar fast imaging device according to the embodiments of the present disclosure is as shown in Figure 5 As shown, the portable arc scanning micro-variation monitoring radar fast imaging device includes:

[0128] An acquisition module 100, configured to acquire the radar monitoring signals received within the arc scanning range, and the radar monitoring signals carry rotation angle direction information;

[0129] A range compression module 200, configured to perform range direction compression on the radar monitoring signals to obtain corresponding range compression signals;

[0130] A compensation module 300, configured to perform compensation processing on the range compression signals based on the constructed signal space residual amount to obtain compensated radar signals;

[0131] A reconstruction module 400 is configured to perform image reconstruction on the compensated radar signal by using a multi-level reconstruction strategy to obtain a radar image.

[0132] Figure 2 FIG. 4 shows a schematic structural diagram of a portable arc-scanning micro-variation monitoring radar fast imaging device according to an embodiment of the present disclosure. The portable arc-scanning micro-variation monitoring radar fast imaging device includes:

[0133] An antenna subsystem 10 is configured to transmit a radar transmission signal and receive a corresponding radar monitoring signal;

[0134] A signal processing system 20 is configured to process the radar monitoring signal to reconstruct a radar image;

[0135] A rotation subsystem 30 is configured to rotate according to a received instruction and drive the antenna subsystem to rotate within a preset angle range;

[0136] A control subsystem 40 is configured to transmit a rotation instruction to the rotation subsystem to control the rotation subsystem to rotate within an angle range not greater than the preset angle range.

[0137] Wherein, a tripod 50 for supporting and a power supply 60 for the radar imaging device to work may be installed under the rotation subsystem 30.

[0138] In an embodiment of the present disclosure, the control subsystem 40 can control the rotation subsystem 30 connected to the antenna subsystem to be parallel to the ray of a circle with a radius of γ, and control the signal processing system to collect data for processing to obtain radar imaging. In an embodiment of the present disclosure, first, the aperture orientation of the antenna subsystem is always controlled to scan to the left, and a left deviation angle θ 左 is set, and the set value is where θ 主 is the main lobe width of the antenna. The control subsystem controls the rotation subsystem and runs the signal processing module for imaging processing to obtain a first radar image with the antenna deviated to the left; secondly, the aperture orientation of the antenna subsystem is always controlled to scan to the right, and a right deviation angle θ 右 is designed, and the set value is Furthermore, a second radar image with the antenna deviated to the right is obtained, and then splicing and replacement processing of the first radar image and the second radar image is performed. The left deviation image and the right deviation radar image are intercepted for image data in the ranges of 0 to θ 左 and θ max -θ 右 to θ max where θ max is the maximum angle range of the observation scene, and then radar imaging within the required preset angle range is obtained.

[0139] Based on the above configuration, during actual application, it is placed in a field environment. Due to the harsh external environment, in order to ensure the long-term stable operation of the device, it needs to be placed inside the observation room. A small window needs to be opened to the observation scene so that it can radiate signals to the scene. This limits the rotation range of the device, resulting in an inevitable part of the scene that does not belong to the full synthetic aperture illumination area, causing the edge areas of the image on both sides to be defocused. Therefore, the embodiment of the present disclosure connects a miniature turntable at the end of the antenna to compensate for this defect. At the same time, a flexible control strategy is designed, combined with the signal processing module, to achieve accurate reconstruction of the radar image.

[0140] In addition, conventional one-dimensional range compression methods can cause sidelobes to overwhelm weaker targets at close range due to the presence of distant strong targets. To address this issue, the present invention employs a combination of windowing and gradient sharpening. Simple windowing can significantly reduce the energy of the sidelobes, but it also broadens the mainlobe signal, reducing its resolution. Combining this with gradient sharpening can sharpen the width of the mainlobe signal, achieving the goal of minimizing sidelobe energy while maintaining the original resolution.

[0141] In addition, most conventional imaging methods of synthetic aperture rotation systems use BP accumulation imaging. Although it has high accuracy, the computation is too large, which reduces the overall operating time of the system. Conventional frequency domain processing algorithms can greatly save computational complexity through Fourier transform operations in the frequency domain and cancellation operations of compensation terms. However, due to the unique slant range expression of this system, the redundant error of its approximation is large. Therefore, the present disclosure provides a portable arc scanning micro-variable monitoring radar fast imaging method that can solve the problem of computational complexity and accuracy; its core idea is to decompose it with the help of BP back-projection superposition, construct Q-level image coefficients and then accumulate them to obtain a reconstructed image; in addition, the present disclosure also uses fast Fourier transform to achieve the purpose of fast computational complexity, and only approximates one term of the slant range expression based on Taylor expansion; this ensures the accuracy of imaging.

[0142] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments. For the sake of brevity, it will not be repeated here.

[0143] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, wherein the computer program instructions implement the above method when executed by a processor. The computer-readable storage medium may be a non-volatile computer-readable storage medium.

[0144] An embodiment of the present disclosure further proposes an electronic device, comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to perform the above method.

[0145] The electronic device may be provided as a terminal, a server, or other forms of devices.

[0146] Figure 6 FIG. 6 is a block diagram showing an electronic device 800 according to an embodiment of the present disclosure. For example, the electronic device 800 may be a terminal such as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0147] Refer to Figure 6 , the electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0148] The processing component 802 generally controls the overall operation of the electronic device 800, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the above methods. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.

[0149] The memory 804 is configured to store various types of data to support the operation of the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, contact data, phone book data, messages, pictures, videos, etc. The memory 804 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0150] The power supply component 806 provides power to various components of the electronic device 800. The power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800.

[0151] The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can not only sense the boundaries of touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 808 includes a front camera and / or a rear camera. When the electronic device 800 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0152] The audio component 810 is configured to output and / or input audio signals. For example, the audio component 810 includes a microphone (MIC) that is configured to receive external audio signals when the electronic device 800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 further includes a speaker for outputting audio signals.

[0153] The I / O interface 812 provides an interface between the processing component 802 and a peripheral interface module, which can be a keyboard, a click wheel, buttons, etc. These buttons can include but are not limited to: a home button, a volume button, a power button, and a lock button.

[0154] The sensor component 814 includes one or more sensors for providing status assessments of various aspects of the electronic device 800. For example, the sensor component 814 can detect the on / off state of the electronic device 800, the relative positioning of components, such as the display and the keypad of the electronic device 800. The sensor component 814 can also detect a change in the position of the electronic device 800 or a component of the electronic device 800, the presence or absence of user contact with the electronic device 800, the orientation or acceleration / deceleration of the electronic device 800, and the temperature change of the electronic device 800. The sensor component 814 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 814 can also include a light sensor, such as a CMOS or a CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 814 can further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0155] The communication component 816 is configured to facilitate communication, either in a wired or wireless manner, between the electronic device 800 and other devices. The electronic device 800 can access a wireless network based on communication standards, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0156] In an exemplary embodiment, the electronic device 800 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described methods.

[0157] In an exemplary embodiment, a non-volatile computer-readable storage medium is also provided, such as a memory 804 including computer program instructions, which can be executed by a processor 820 of the electronic device 800 to complete the above-described methods.

[0158] Figure 7 A block diagram of an electronic device 1900 according to an embodiment of the present disclosure is shown. For example, the electronic device 1900 can be provided as a server. Referring to Figure 7 , the electronic device 1900 includes a processing component 1922, which further includes one or more processors, and memory resources represented by a memory 1932 for storing instructions executable by the processing component 1922, such as application programs. The application programs stored in the memory 1932 can include one or more modules each corresponding to a set of instructions. In addition, the processing component 1922 is configured to execute instructions to perform the above-described methods.

[0159] The electronic device 1900 may further include a power component 1926 configured to perform power management of the electronic device 1900, a wired or wireless network interface 1950 configured to connect the electronic device 1900 to a network, and an input / output (I / O) interface 1958. The electronic device 1900 can operate based on an operating system stored in the memory 1932, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

[0160] In an exemplary embodiment, a non-volatile computer-readable storage medium is also provided, such as a memory 1932 including computer program instructions, and the computer program instructions can be executed by a processing component 1922 of an electronic device 1900 to complete the above method.

[0161] The present disclosure may be a system, a method, and / or a computer program product. The computer program product may include a computer-readable storage medium having thereon computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0162] A computer-readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punched card or raised structures in a groove having instructions stored thereon, and any suitable combination of the foregoing. The computer-readable storage medium used herein is not construed as an instantaneous signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagated through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0163] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to various computing / processing devices, or downloaded to an external computer or external storage device through a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include a copper transmission cable, an optical fiber transmission, a wireless transmission, a router, a firewall, a switch, a gateway computer, and / or an edge server. A network adapter or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0164] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine - related instructions, microcode, firmware instructions, state - setting data, or source code or object code written in any combination of one or more programming languages, including object - oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer - readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand - alone software package, executed partially on the user's computer and partially on a remote computer, or executed entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via an Internet service provider through the Internet). In some embodiments, by using the state information of the computer - readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field - programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer - readable program instructions to implement various aspects of the present disclosure.

[0165] Aspects of the present disclosure are described herein with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer - readable program instructions.

[0166] These computer - readable program instructions can be provided to a processor of a general - purpose computer, a special - purpose computer, or other programmable data - processing apparatus to produce a machine such that, when the instructions are executed by the processor of the computer or other programmable data - processing apparatus, a device is produced that implements the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer - readable program instructions can also be stored in a computer - readable storage medium, which causes a computer, a programmable data - processing apparatus, and / or other devices to operate in a particular manner. Thus, the computer - readable medium storing the instructions includes a manufacture, which includes instructions for implementing various aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0167] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device, causing a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to generate a computer-implemented process, so that the instructions executed on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in one or more boxes of the flowchart and / or block diagram.

[0168] The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of an instruction, which contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two consecutive blocks may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block of the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or acts, or by a combination of dedicated hardware and computer instructions.

[0169] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the technical improvements in the technology in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A portable arc scanning micro-variation monitoring radar rapid imaging method, characterized in that: include: Acquire a radar monitoring signal received within an arc scanning range, wherein the radar monitoring signal carries rotation angle information; Performing range compression on the radar monitoring signal to obtain a corresponding range compression signal; performing compensation processing on the range compression signal based on the constructed signal space residual to obtain a compensated radar signal; Performing image reconstruction on the compensated radar signal using a multi-level reconstruction strategy to obtain a radar image; The method of performing image reconstruction on the compensated radar signal using a multi-level reconstruction strategy to obtain a radar image includes: constructing a primary reconstructed image and a qth-level reconstructed image in sequence according to the compensated radar signal, where q is an integer greater than zero and less than Q, and Q is the total number of reconstruction levels; The primary reconstructed image to the Qth-level reconstructed image are added together to obtain the final radar image.

2. The method according to claim 1, characterized in that The acquiring of the radar monitoring signal received within the arc scanning range includes: Control the radar to rotate at a preset angle within a preset angle range and send radar transmission signals; Receiving radar echo signals corresponding to the radar transmission signals at each preset angle; The radar monitoring signal is determined according to the radar echo signals at each preset angle.

3. The method according to claim 2, characterized in that The method further includes: performing preprocessing on the radar echo signal to obtain the radar monitoring signal; Perform mixing processing on the received radar echo signal to obtain an intermediate frequency signal; performing redundant phase compensation processing on the intermediate frequency signal to obtain a phase compensated signal; The radar monitoring signal is determined according to the phase compensation signal and the angle corresponding to the radar echo signal.

4. The method according to any one of claims 1 to 3, characterized in that The performing range compression on the radar monitoring signal to obtain a corresponding range compression signal includes: Using a cosine window to reduce the sidelobe of the radar monitoring signal to obtain a first signal; performing an inverse Fourier transform on the first signal to obtain a second signal; The peak point position of the second signal is determined, and the gradient of the second signal is adjusted according to the peak point position to obtain the range compression signal.

5. The method according to any one of claims 1 to 3, characterized in that The performing compensation processing on the range compression signal based on the constructed signal space residual to obtain a compensated radar signal includes: Construct signal space residual according to preset principles; The compensated radar signal is obtained according to a product of the signal spatial residual and the range compression signal.

6. A portable arc scanning micro-variation monitoring radar rapid imaging device, characterized in that: include: An acquisition module is used to acquire a radar monitoring signal received within an arc scanning range, wherein the radar monitoring signal carries rotation angle information; A range compression module, configured to perform range compression on the radar monitoring signal to obtain a corresponding range compression signal; a compensation module, configured to perform compensation processing on the range compression signal based on the constructed signal space residual to obtain a compensated radar signal; a reconstruction module, configured to perform image reconstruction on the compensated radar signal using a multi-level reconstruction strategy to obtain a radar image; The reconstruction module sequentially constructs a primary reconstructed image and a qth-level reconstructed image according to the compensated radar signal, where q is an integer greater than zero and less than Q, and Q is a total number of reconstruction levels; The primary reconstructed image to the Qth-level reconstructed image are added together to obtain the final radar image.

7. A portable arc-scanning micro-variation monitoring radar rapid imaging device according to claim 6, characterized in that: include: Antenna subsystem, used to send radar transmission signals and receive corresponding radar monitoring signals; a signal processing system, configured to process the radar monitoring signal to reconstruct a radar image; A rotation subsystem, configured to rotate according to a received instruction and drive the antenna subsystem to rotate within a preset angle range; a control subsystem, configured to transmit a rotation instruction to the rotating subsystem to control the rotating subsystem to rotate within an angle range not greater than the preset angle range; The control subsystem can control the rotation subsystem connected to the antenna subsystem to make it parallel to the ray of the circle with a radius of γ, and control the signal processing system to collect data for processing to obtain radar imaging; specifically, first, the antenna subsystem is controlled to always scan to the left, and the left deviation angle θ is set. 左 , set the value to where θ 主 The control subsystem controls the rotation subsystem and runs the signal processing module to perform imaging processing to obtain the first radar image of the antenna with the antenna deflected to the left. Secondly, the control antenna subsystem is always scanned to the right, and the right deflection angle θ is designed. 右 , set the value to Then, the second radar image with the antenna deflected to the right is obtained, and then the first radar image and the second radar image are spliced and replaced, and the first radar image and the second radar image are cut off from 0 to θ 左 and θ max -θ 右 ~θ max Range of image data, where θ max is the maximum angular range of the observed scene, and the radar image is obtained.

Images