Detection method and device based on high-frequency microwave ground penetrating induction radar

Abstract

The invention discloses a detection method and device based on a high-frequency microwave ground penetrating induction radar, and relates to the technical field of radar detection, and the method comprises the steps: transmitting a first signal to a target region, receiving a reflection signal reflected by the first signal, obtaining an initial reflection signal, obtaining a first target image according to the initial reflection signal, and obtaining a second target image according to the first target image; identifying each layer structure in the first target image, determining the depth and the dielectric constant of the layer structure, obtaining the emission frequency of the layer structure according to the depth and the dielectric constant, emitting the emission frequency corresponding to each layer structure to the target area, receiving the corresponding reflection signal, and obtaining a final image according to each reflection signal; the obtained emission frequencies corresponding to the structures with different densities consider the influence of the actual emission antenna frequency of the high-frequency microwave ground penetrating induction radar on the measurement of the structures with different densities, and the emission frequency of the high-frequency microwave ground penetrating induction radar can be dynamically adjusted according to the actual underground structures with different densities; therefore, the measurement error of the structures with different densities is relatively small.

Description

Technical Field

[0001] The present invention belongs to the field of radar detection technology, and in particular relates to a detection method and device based on high-frequency microwave ground-penetrating induction radar. Background Art

[0002] High-frequency microwave ground-penetrating induction radar is a radar system that uses high-frequency microwave signals to detect underground targets. It is usually used in geological exploration, archeology, soil analysis, and safety inspection. This radar system sends high-frequency microwave signals underground, and then receives and analyzes the signals reflected from the underground targets to determine the location, shape, and characteristics of the underground targets. Due to the superior performance of high-frequency microwaves in penetrating soil and rocks, this radar system can quickly and accurately detect underground targets without direct contact with the surface.

[0003] When the existing microwave induction radar detects underground structures of different densities, it transmits microwave signals to the underground. These microwaves will penetrate the surface and interact with the underground structures. Underground structures of different densities will reflect, scatter or absorb the microwave signals to different degrees. The receiver of the microwave induction radar will capture and record the characteristics of these reflected signals. By analyzing the received reflected signals, the microwave induction radar can determine some characteristics of the underground structure, such as density changes, dielectric constant changes, etc. Based on these characteristics, the type of underground structure can be inferred, such as rock, soil, metal or cavity.

[0004] However, the above technology does not take into account the impact of the actual high-frequency microwave ground-penetrating induction radar's transmission frequency on the measurement of structures of different densities, and cannot dynamically adjust the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the actual underground structures of different densities, which may lead to large errors in the final measurement of structures of different densities. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the influence of the actual high-frequency microwave ground-penetrating induction radar transmission frequency on the measurement of structures with different densities is not taken into account, and the transmission frequency of the high-frequency microwave ground-penetrating induction radar cannot be dynamically adjusted according to the actual underground structures with different densities, which may lead to large errors in the final measurement of structures with different densities. A detection method and device based on high-frequency microwave ground-penetrating induction radar are proposed.

[0006] In a first aspect of the present invention, a detection method based on a high-frequency microwave ground-penetrating induction radar is first proposed, the method comprising:

[0007] A first signal is transmitted to a target area, and a reflected signal reflected by the first signal is received to obtain an initial reflected signal, and a first target image is obtained according to the initial reflected signal; the frequency of the first signal is a maximum transmission frequency set to reach a preset detection depth; the first target image includes layer structures of different densities of the target area in the preset detection depth;

[0008] Identify each layer structure in the first target image, determine the depth corresponding to the layer structure, and determine the dielectric constant corresponding to the layer structure, and obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure;

[0009] The emission frequencies corresponding to the various layers of the structure are emitted to the target area, and corresponding reflection signals are received, and a final image is obtained according to the reflection signals.

[0010] Optionally, obtaining a first target image according to the initial reflection signal includes:

[0011] Arrange the initial reflection signals in the order of receiving time to obtain a preliminary reflection signal sequence;

[0012] Performing discrete wavelet transform on each reflection signal in the preliminary reflection signal sequence using Daubechies wavelet to obtain wavelet coefficients of the reflection signal, and obtaining a scale and a translation range corresponding to the reflection signal according to the wavelet coefficients;

[0013] The scale and translation range of each reflected signal are compared with the scale and translation range corresponding to the highest transmission frequency. When the scale corresponding to the reflected signal is similar to the scale corresponding to the highest transmission frequency, and the translation range corresponding to the reflected signal is within the translation range corresponding to the highest transmission frequency, the reflected signal is recorded as a usable signal;

[0014] All available signals in the preliminary reflection signal sequence are screened out, and inverse wavelet transform is performed on all available signals to obtain a first reflection signal, a second target image is obtained according to the first reflection signal, and image enhancement is performed on the second target image to obtain a first target image.

[0015] Optionally, performing image enhancement on the second target image to obtain the first target image includes:

[0016] The second target image is preliminarily layered according to preset brightness to obtain a preliminary target image, and the edges of different brightness layers in the preliminary target image are identified using Canny edge detection to obtain specific dividing lines between different brightness layers to obtain the first target image.

[0017] Optionally, obtaining the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure includes:

[0018] Acquire the specific underground depth corresponding to each dividing line in the first target image to obtain the actual underground depth corresponding to each structural layer;

[0019] The dielectric constant corresponding to each structural layer in the first target image is obtained, and the actual depth and dielectric constant of the structural layer are processed to obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar of the structural layer.

[0020] Optionally, obtaining a final image according to each reflection signal includes:

[0021] Transmitting the transmission frequency corresponding to each structural layer to the target area, receiving the corresponding reflection signal, and obtaining the corresponding reflection image according to the different reflection signals;

[0022] Segment each reflected image according to a preset dividing line of the layer structure to obtain a segmented image of the structure;

[0023] All segmented images are spliced ​​according to the depth of each layer structure to obtain the final image.

[0024] In a second aspect of the present invention, a detection device based on a high-frequency microwave ground-penetrating induction radar is proposed, comprising: the device comprises: a first target image module, a transmission frequency determination module and a final image module, wherein:

[0025] First target image module: transmits a first signal to a target area, receives a reflected signal reflected by the first signal, obtains an initial reflected signal, and obtains a first target image according to the initial reflected signal; the frequency of the first signal is the highest transmission frequency set to reach a preset detection depth; the first target image includes layer structures of different densities of the target area in the preset detection depth;

[0026] Transmitting frequency determination module: identifying each layer structure in the first target image, determining the depth corresponding to the layer structure, and determining the dielectric constant corresponding to the layer structure, and obtaining the transmitting frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure;

[0027] Final image module: transmits the emission frequencies corresponding to each layer structure to the target area, receives the corresponding reflection signals, and obtains the final image according to each reflection signal.

[0028] Optionally, the first target image module includes

[0029] Signal sequence module: sorts the initial reflection signals according to the order of receiving time to obtain a preliminary reflection signal sequence;

[0030] Wavelet transformation module: performing discrete wavelet transformation on each reflection signal in the preliminary reflection signal sequence using Daubechies wavelet to obtain the wavelet coefficient of the reflection signal, and obtaining the scale and translation range corresponding to the reflection signal according to the wavelet coefficient;

[0031] Available signal module: compare the scale and translation range of each reflected signal with the scale and translation range corresponding to the highest transmission frequency. When the scale corresponding to the reflected signal is similar to the scale corresponding to the highest transmission frequency, and the translation range corresponding to the reflected signal is within the translation range corresponding to the highest transmission frequency, the reflected signal is recorded as an available signal.

[0032] Image determination module: screens out all available signals in the preliminary reflection signal sequence, and performs inverse wavelet transform on all available signals to obtain a first reflection signal, obtains a second target image based on the first reflection signal, and performs image enhancement on the second target image to obtain a first target image.

[0033] Optionally, the image determination module includes an image enhancement module:

[0034] Image enhancement module: Preliminary stratification is performed on the second target image according to preset brightness to obtain a preliminary target image, and Canny edge detection is used to identify the edges of different brightness layers in the preliminary target image to obtain specific dividing lines between different brightness layers to obtain the first target image.

[0035] Optionally, the transmission frequency determination module includes a depth determination module and a processing determination module:

[0036] Depth determination module: obtaining the specific underground depth corresponding to each dividing line in the first target image, and obtaining the actual underground depth corresponding to each structural layer;

[0037] Processing and determining module: obtaining the dielectric constant corresponding to each structural layer in the first target image, and processing the actual depth and dielectric constant of the structural layer to obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar of the structural layer.

[0038] Optionally, the final image module includes a reflection image module, a segmentation image module and a final stitching module:

[0039] Reflection image module: transmits the emission frequency corresponding to each structural layer to the target area, receives the corresponding reflection signal, and obtains the corresponding reflection image according to the different reflection signals;

[0040] Image segmentation module: segment each reflection image according to the preset dividing line of the layer structure to obtain a segmented image of the structure;

[0041] Final stitching module: stitch all segmented images according to the depth of each layer structure to get the final image.

[0042] Beneficial effects of the present invention:

[0043] The present invention proposes a detection method based on a high-frequency microwave ground-penetrating induction radar, which transmits a first signal to a target area and receives a reflection signal reflected by the first signal to obtain an initial reflection signal, obtains a first target image according to the initial reflection signal, and then identifies each layer structure in the first target image, determines the depth corresponding to the layer structure, and determines the dielectric constant corresponding to the layer structure, obtains the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure, and then transmits the transmission frequency corresponding to each layer structure to the target area, and receives the corresponding reflection signal, and obtains a final image according to each reflection signal. In this way, the final image obtained by the transmission frequency corresponding to each layer structure can clearly show underground structures of different densities. The transmission frequency corresponding to the structure of different densities obtained in this way takes into account the influence of the actual high-frequency microwave ground-penetrating induction radar transmitting antenna frequency on the measurement of structures of different densities, and can dynamically adjust the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the actual underground structures of different densities, so that the error of the final measurement of structures of different densities is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] Figure 1 A flow chart of a detection method based on a high-frequency microwave ground-penetrating induction radar provided in an embodiment of the present invention;

[0046] Figure 2 A framework diagram of a detection device based on a high-frequency microwave ground-penetrating induction radar provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0048] The embodiment of the present invention provides a detection method based on high-frequency microwave ground-penetrating induction radar. Figure 1 , Figure 1 A flow chart of a detection method based on a high-frequency microwave ground-penetrating induction radar provided in an embodiment of the present invention. The method comprises the following steps:

[0049] A first signal is transmitted to a target area, and a reflected signal reflected by the first signal is received to obtain an initial reflected signal, and a first target image is obtained according to the initial reflected signal; the frequency of the first signal is a maximum transmission frequency set to reach a preset detection depth; the first target image includes layer structures of different densities of the target area in the preset detection depth;

[0050] Identify each layer structure in the first target image, determine the depth corresponding to the layer structure, and determine the dielectric constant corresponding to the layer structure, and obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure;

[0051] The emission frequencies corresponding to each layer structure are emitted to the target area, and the corresponding reflected signals are received, and the final image is obtained according to each reflected signal.

[0052] In one implementation, the target area is an underground detection area determined according to a preset detection depth, which is determined by specific staff. The specific preset detection depth is set by the staff according to actual conditions and is not specifically limited.

[0053] In one implementation, the final image obtained by the transmission frequencies corresponding to the transmitted structures of each layer can clearly show the underground structures of different densities. The transmission frequencies corresponding to the structures of different densities obtained in this way take into account the influence of the actual high-frequency microwave ground-penetrating induction radar transmitting antenna frequency on the measurement of structures of different densities. The transmission frequency of the high-frequency microwave ground-penetrating induction radar can be dynamically adjusted according to the actual underground structures of different densities, so that the error of the final measurement of structures of different densities is smaller.

[0054] In one implementation, the highest transmission frequency refers to the frequency transmitted by the high-frequency microwave ground-penetrating induction radar determined according to the preset detection depth; for example, the staff needs to detect all structures of different densities within 50 meters underground. Since the depth of this detection is limited to 50 meters, the frequency transmitted by the high-frequency microwave ground-penetrating induction radar can just penetrate 50 meters underground. The frequency transmitted by the high-frequency microwave ground-penetrating induction radar corresponding to the frequency that can just penetrate 50 meters underground is the highest transmission frequency; it should be noted that the highest transmission frequency is not a fixed value, and the value of the highest transmission frequency can be set according to the actual depth of the underground to be detected;

[0055] In addition, it should be noted that the reason why the frequency emitted by the high-frequency microwave ground-penetrating induction radar determined according to the preset detection depth is recorded as the highest transmitting frequency is that, for the frequency emitted by the high-frequency microwave ground-penetrating induction radar, the lower the emission frequency, the greater the underground depth detected, but the lower the accuracy, and vice versa, the depth becomes relatively lower and the accuracy is greater; therefore, adjusting the frequency is to adjust the clarity and depth of the underground structure.

[0056] In one embodiment, obtaining a first target image according to the initial reflection signal includes:

[0057] Arrange the initial reflection signals in the order of receiving time to obtain a preliminary reflection signal sequence;

[0058] Performing discrete wavelet transform on each reflection signal in the preliminary reflection signal sequence using Daubechies wavelet to obtain the wavelet coefficient of the reflection signal, and obtaining the scale and translation range corresponding to the reflection signal according to the wavelet coefficient;

[0059] The scale and translation range of each reflected signal are compared with the scale and translation range corresponding to the highest transmission frequency. When the scale corresponding to the reflected signal is similar to the scale corresponding to the highest transmission frequency, and the translation range corresponding to the reflected signal is within the translation range corresponding to the highest transmission frequency, the reflected signal is recorded as a usable signal;

[0060] All available signals in the preliminary reflection signal sequence are screened out, and inverse wavelet transform is performed on all available signals to obtain a first reflection signal, a second target image is obtained according to the first reflection signal, and image enhancement is performed on the second target image to obtain a first target image.

[0061] In one implementation, by comparing the scale and translation range of the reflected signal and selecting the signal that matches the set highest transmission frequency, the influence of noise and interference signals can be reduced, thereby improving the quality of the signal; this can ensure that the processed signal is more relevant to the target, making the image clearer and more accurate;

[0062] It should be noted that the scale and translation range corresponding to the highest transmission frequency are set by professionals according to actual conditions, and the details will not be elaborated here.

[0063] In one embodiment, performing image enhancement on the second target image to obtain the first target image includes:

[0064] The second target image is preliminarily layered according to preset brightness to obtain a preliminary target image, and the edges of different brightness layers in the preliminary target image are identified using Canny edge detection to obtain specific dividing lines between different brightness layers to obtain the first target image.

[0065] In one implementation, the preset brightness is set by professional personnel based on actual conditions; because underground structures of different densities ultimately present different brightnesses on the image, the second target image is first preliminarily stratified based on the brightness of the second target image and the preset brightness to obtain a preliminary target image, and then the edges of the different brightness layers in the preliminary target image are identified using Canny edge detection to obtain specific dividing lines between the different brightness layers to obtain the first target image. In this way, the stratification effect of each structure of the final first target image is more obvious and more accurate.

[0066] In one embodiment, obtaining the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure includes:

[0067] Obtaining the specific underground depth corresponding to each dividing line in the first target image, and obtaining the actual underground depth corresponding to each structural layer;

[0068] The dielectric constant corresponding to each structural layer in the first target image is obtained, and the actual depth and dielectric constant of the structural layer are processed to obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar of the structural layer.

[0069] In one implementation, the dielectric constants of the actual underground objects of different densities corresponding to each structural layer in the first target image are different, and the specific dielectric constants corresponding to the objects of different densities can be obtained according to the corresponding table of actual dielectric constants; through the actual dielectric constants of objects of different densities and their actual depths underground, the frequencies emitted by the high-frequency microwave ground-penetrating induction radars corresponding to the objects of different densities required to appear clearer in the image can be obtained; the frequency emitted by the high-frequency microwave ground-penetrating induction radar obtained in this way is more accurate.

[0070] In one embodiment, obtaining a final image according to each reflection signal includes:

[0071] The transmission frequency corresponding to each structural layer is transmitted to the target area, and the corresponding reflection signal is received, and the corresponding reflection image is obtained according to the different reflection signals;

[0072] Segment each reflected image according to a preset dividing line of the layer structure to obtain a segmented image of the structure;

[0073] All segmented images are spliced ​​according to the depth of each layer structure to obtain the final image.

[0074] In one implementation, when the emission frequencies corresponding to each structural layer are emitted to the target area, although relatively clear images of different structures can be presented, in order to make the final image clearer, each different reflected image is segmented according to the preset structural dividing line of the layer to obtain a segmented image of each layer of the structure; and then the images are re-stitched, so that the final image is clearer and can better reflect the different density structures underground.

[0075] Based on the same inventive concept, the present invention also provides a detection device based on a high-frequency microwave ground-penetrating induction radar. Figure 2 , Figure 2 A schematic structural diagram of a framework diagram of a detection device based on a high-frequency microwave ground-penetrating induction radar provided in an embodiment of the present invention includes: a first target image module, a transmission frequency determination module and a final image module, wherein:

[0076] First target image module: transmits a first signal to the target area, receives a reflected signal reflected by the first signal, obtains an initial reflected signal, and obtains a first target image according to the initial reflected signal; the frequency of the first signal is the highest transmission frequency set to reach a preset detection depth; the first target image includes layer structures of different densities of the target area in the preset detection depth;

[0077] Transmitting frequency determination module: identifying each layer structure in the first target image, determining the depth corresponding to the layer structure, and determining the dielectric constant corresponding to the layer structure, and obtaining the transmitting frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure;

[0078] Final image module: transmits the emission frequency corresponding to each layer structure to the target area, receives the corresponding reflection signal, and obtains the final image based on each reflection signal.

[0079] Based on the detection device based on high-frequency microwave ground-penetrating induction radar provided by the embodiment of the present invention, the final image obtained by the transmission frequencies corresponding to the transmitted structures of each layer can clearly show the underground structures of different densities. The transmission frequencies corresponding to the structures of different densities obtained in this way take into account the influence of the actual high-frequency microwave ground-penetrating induction radar transmitting antenna frequency on the measurement of structures of different densities, and can dynamically adjust the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the actual underground structures of different densities, so that the error of the final measurement of structures of different densities is small.

[0080] In one embodiment, the first target image module includes:

[0081] Signal sequence module: sorts the initial reflection signals according to the order of receiving time to obtain a preliminary reflection signal sequence;

[0082] Wavelet transformation module: using Daubechies wavelet to perform discrete wavelet transformation on each reflection signal in the preliminary reflection signal sequence to obtain the wavelet coefficient of the reflection signal, and according to the wavelet coefficient, obtain the scale and translation range corresponding to the reflection signal;

[0083] Available signal module: compare the scale and translation range of each reflected signal with the scale and translation range corresponding to the highest transmission frequency. When the scale corresponding to the reflected signal is similar to the scale corresponding to the highest transmission frequency, and the translation range corresponding to the reflected signal is within the translation range corresponding to the highest transmission frequency, the reflected signal is recorded as an available signal.

[0084] Image determination module: screens out all available signals in the preliminary reflection signal sequence, performs inverse wavelet transform on all available signals to obtain a first reflection signal, obtains a second target image based on the first reflection signal, and performs image enhancement on the second target image to obtain a first target image.

[0085] In one embodiment, the image enhancement module: performs preliminary stratification on the second target image according to preset brightness to obtain a preliminary target image, and uses Canny edge detection to identify the edges of different brightness layers in the preliminary target image to obtain specific dividing lines between different brightness layers to obtain the first target image.

[0086] In one embodiment, the transmission frequency determination module includes a depth determination module and a processing determination module:

[0087] Depth determination module: obtains the specific underground depth corresponding to each dividing line in the first target image, and obtains the actual underground depth corresponding to each structural layer;

[0088] Processing and determining module: obtains the dielectric constant corresponding to each structural layer in the first target image, and processes the actual depth and dielectric constant of the structural layer to obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar of the structural layer.

[0089] In one embodiment, the final image module includes a reflection image module, a segmentation image module and a final stitching module:

[0090] Reflection image module: transmits the emission frequency corresponding to each structural layer to the target area, receives the corresponding reflection signal, and obtains the corresponding reflection image according to different reflection signals;

[0091] Image segmentation module: segment each reflection image according to the preset dividing line of the layer structure to obtain a segmented image of the structure;

[0092] Final stitching module: stitch all segmented images according to the depth of each layer structure to get the final image.

[0093] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A detection method based on high-frequency microwave ground-penetrating induction radar, characterized in that: The method comprises: A first signal is transmitted to a target area, and a reflected signal reflected by the first signal is received to obtain an initial reflected signal, and a first target image is obtained according to the initial reflected signal; the frequency of the first signal is a maximum transmission frequency set to reach a preset detection depth; the first target image includes layer structures of different densities of the target area in the preset detection depth; Identify each layer structure in the first target image, determine the depth corresponding to the layer structure, and determine the dielectric constant corresponding to the layer structure, and obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure; The emission frequencies corresponding to the various layers of the structure are emitted to the target area, and corresponding reflection signals are received, and a final image is obtained according to the reflection signals.

2. The detection method based on high-frequency microwave ground-penetrating induction radar according to claim 1 is characterized in that: Obtaining a first target image according to the initial reflection signal comprises: Arrange the initial reflection signals in the order of receiving time to obtain a preliminary reflection signal sequence; Performing discrete wavelet transform on each reflection signal in the preliminary reflection signal sequence using Daubechies wavelet to obtain wavelet coefficients of the reflection signal, and obtaining a scale and a translation range corresponding to the reflection signal according to the wavelet coefficients; The scale and translation range of each reflected signal are compared with the scale and translation range corresponding to the highest transmission frequency. When the scale corresponding to the reflected signal is similar to the scale corresponding to the highest transmission frequency, and the translation range corresponding to the reflected signal is within the translation range corresponding to the highest transmission frequency, the reflected signal is recorded as a usable signal; All available signals in the preliminary reflection signal sequence are screened out, and inverse wavelet transform is performed on all available signals to obtain a first reflection signal, a second target image is obtained according to the first reflection signal, and image enhancement is performed on the second target image to obtain a first target image.

3. The detection method based on high-frequency microwave ground-penetrating induction radar according to claim 2 is characterized in that: Performing image enhancement on the second target image to obtain the first target image includes: The second target image is preliminarily layered according to preset brightness to obtain a preliminary target image, and the edges of different brightness layers in the preliminary target image are identified using Canny edge detection to obtain specific dividing lines between different brightness layers to obtain the first target image.

4. The detection method based on high-frequency microwave ground-penetrating induction radar according to claim 1 is characterized in that: According to the depth and dielectric constant corresponding to the layer structure, the transmission frequency of the high-frequency microwave ground-penetrating induction radar includes: Acquire the specific underground depth corresponding to each dividing line in the first target image to obtain the actual underground depth corresponding to each structural layer; The dielectric constant corresponding to each structural layer in the first target image is obtained, and the actual depth and dielectric constant of the structural layer are processed to obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar of the structural layer.

5. The detection method based on high-frequency microwave ground-penetrating induction radar according to claim 1 is characterized in that: The final image obtained according to each reflection signal includes: Transmitting the transmission frequency corresponding to each structural layer to the target area, receiving the corresponding reflection signal, and obtaining the corresponding reflection image according to the different reflection signals; Segment each reflected image according to a preset dividing line of the layer structure to obtain a segmented image of the structure; All segmented images are spliced ​​according to the depth of each layer structure to obtain the final image.

6. A detection device based on high-frequency microwave ground-penetrating induction radar, characterized in that: The device comprises a first target image module, a transmission frequency determination module and a final image module, wherein: First target image module: transmits a first signal to a target area, receives a reflected signal reflected by the first signal, obtains an initial reflected signal, and obtains a first target image according to the initial reflected signal; the frequency of the first signal is the highest transmission frequency set to reach a preset detection depth; the first target image includes layer structures of different densities of the target area in the preset detection depth; Transmitting frequency determination module: identifying each layer structure in the first target image, determining the depth corresponding to the layer structure, and determining the dielectric constant corresponding to the layer structure, and obtaining the transmitting frequency of the high-frequency microwave ground-penetrating induction radar according to the depth and dielectric constant corresponding to the layer structure; Final image module: transmits the emission frequencies corresponding to each layer structure to the target area, receives the corresponding reflection signals, and obtains the final image according to each reflection signal.

7. The detection device based on high-frequency microwave ground-penetrating induction radar according to claim 6 is characterized in that: The first target image module includes Signal sequence module: sorts the initial reflection signals according to the order of receiving time to obtain a preliminary reflection signal sequence; Wavelet transformation module: performing discrete wavelet transformation on each reflection signal in the preliminary reflection signal sequence using Daubechies wavelet to obtain the wavelet coefficient of the reflection signal, and obtaining the scale and translation range corresponding to the reflection signal according to the wavelet coefficient; Available signal module: compare the scale and translation range of each reflected signal with the scale and translation range corresponding to the highest transmission frequency. When the scale corresponding to the reflected signal is similar to the scale corresponding to the highest transmission frequency, and the translation range corresponding to the reflected signal is within the translation range corresponding to the highest transmission frequency, the reflected signal is recorded as an available signal. Image determination module: screens out all available signals in the preliminary reflection signal sequence, and performs inverse wavelet transform on all available signals to obtain a first reflection signal, obtains a second target image based on the first reflection signal, and performs image enhancement on the second target image to obtain a first target image.

8. The detection device based on high-frequency microwave ground-penetrating induction radar according to claim 7 is characterized in that: The image determination module includes an image enhancement module: Image enhancement module: Preliminary stratification is performed on the second target image according to preset brightness to obtain a preliminary target image, and Canny edge detection is used to identify the edges of different brightness layers in the preliminary target image to obtain specific dividing lines between different brightness layers to obtain the first target image.

9. The detection device based on high-frequency microwave ground-penetrating induction radar according to claim 6 is characterized in that: The transmission frequency determination module includes a depth determination module and a processing determination module: Depth determination module: obtaining the specific underground depth corresponding to each dividing line in the first target image, and obtaining the actual underground depth corresponding to each structural layer; Processing and determining module: obtaining the dielectric constant corresponding to each structural layer in the first target image, and processing the actual depth and dielectric constant of the structural layer to obtain the transmission frequency of the high-frequency microwave ground-penetrating induction radar of the structural layer.

10. The detection device based on high-frequency microwave ground-penetrating induction radar according to claim 6 is characterized in that: The final image module includes a reflection image module, a segmentation image module and a final stitching module: Reflection image module: transmits the emission frequency corresponding to each structural layer to the target area, receives the corresponding reflection signal, and obtains the corresponding reflection image according to the different reflection signals; Image segmentation module: segment each reflection image according to the preset dividing line of the layer structure to obtain a segmented image of the structure; Final stitching module: stitch all segmented images according to the depth of each layer structure to get the final image.

Images