Method for rapidly detecting land through ground penetrating radar

Abstract

The invention relates to a method for rapidly detecting land through a ground penetrating radar. Belongs to the technical field of detection, and relates to engineering object detection for detecting structures and defects in a medium by utilizing electromagnetic wave reflection characteristics of the medium to the ground penetrating radar, a transmitting antenna of the ground penetrating radar transmits high-frequency electromagnetic waves to a detected object, and the ground penetrating radar can be detected by collecting, processing and analyzing time-domain waveforms and through longitudinal resolution and transverse resolution of the ground penetrating radar. The spatial position and structural characteristics of an underground interface or a geologic body can be determined; according to the method, the electrical distribution condition of the underground medium is reflected through the ground penetrating radar, and as long as the electrical difference exists in the underground medium, the corresponding reflected wave is found in the radar image section to identify the reflected wave characteristics of various stratums. In the aspect of detecting heavy metal pollution or leakage, the characteristics of reflection enhancement, multiple reflection, event disorder and the like are generally shown.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a method for quickly detecting land by using a ground penetrating radar. Background Art

[0002] In the field of hydrogeological exploration, geophysical exploration is one of the main methods for finding water in water-scarce areas. It can investigate the water content of deep strata, and mainly uses electrical exploration. For karst water and bedrock fissure water, when carbonate rocks, granites, and basalts are high-resistivity bodies, the resistivity becomes lower when broken zones, cracks, and holes contain water. Sandstones with higher porosity are rich in water, and the resistivity of fault broken zones decreases after being filled with water, forming an abnormal body with a certain resistivity difference from the surrounding rock. Based on the above resistivity differences, high-density electrical method, transient electromagnetic method, and audio frequency magnetotelluric method use processing and inversion to obtain apparent resistivity cross-section diagrams and delineate the abnormal range; the induced polarization method uses the size and decay speed of the induced polarization secondary field to infer the water content of the rock mass; the joint profile method uses the low-resistance orthogonal point characteristics or synchronous low-resistance "V"-shaped characteristics of the water-bearing fracture structure, joint fissures and stratigraphic boundaries on the obtained curve to infer the water-rich location; the nuclear magnetic resonance method uses the artificially excited electromagnetic field to obtain the electromagnetic signal amplitude changes that are proportional to the water content in the detection space, which can detect the presence of groundwater. Usually, combined with the hydrogeological conditions, a single method or multiple methods can be used in combination.

[0003] However, when the soil is contaminated by heavy metals, its dielectric constant and resistivity will be significantly different from those of the surrounding normal soil, making it impossible to find out the dominant distribution areas of groundwater in the plot and possible pollution points. Summary of the invention

[0004] The present invention aims to solve the above technical problems and provide a method for quickly detecting land by using a ground penetrating radar.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A method for quickly detecting land by ground penetrating radar comprises the following steps:

[0007] S1. Regional division:

[0008] Before the detection work is carried out, the coordinates of the survey area are first established to determine the plane position of the survey line;

[0009] S2. Marking:

[0010] Use RTK to conduct geodetic work, arrange survey points according to the designed survey line, and mark them with spray paint;

[0011] S3. Parameter settings:

[0012] Select detection parameters for ground penetrating radar:

[0013] S4. Obtain radar profile information:

[0014] Engineering inspection that uses the electromagnetic wave reflection characteristics of the medium to detect the structure and defects inside the medium. The transmitting antenna of the ground penetrating radar transmits high-frequency electromagnetic waves to the detection object. When encountering different dielectric difference interfaces of different target bodies during the propagation process, part of the electromagnetic waves are reflected back and received by the receiving antenna and recorded by the host, thus obtaining the two-way path of the electromagnetic waves reflected from the transmitting antenna to the receiving antenna via the dielectric difference interface;

[0015] By collecting, processing and analyzing the time domain waveform, the spatial position and structural characteristics of the underground interface or geological body can be determined through the longitudinal and lateral resolutions of the ground penetrating radar;

[0016] S4. Data processing:

[0017] After the measurement is completed, the data will be promptly transferred to the computer for storage and subsequent processing;

[0018] The calculation formula for the refraction and reflection of the electromagnetic wave on the medium surface is as follows:

[0019]

[0020] The calculation formulas for the longitudinal resolution and lateral resolution shown are as follows:

[0021] Δ h =λ / 8-λ / 4Formula 3;

[0022]

[0023] Preferably, the detection parameters include antenna center frequency, time window, sampling rate, distance between measuring points and distance between transmitting and receiving antennas.

[0024] Preferably, the target object includes rock, soil, concrete, cavity, landfill, pollutant and pipeline.

[0025] Preferably, in Formula 1 and Formula 2, R is the reflection coefficient, T is the refractive coefficient, and ε1 and ε2 are the dielectric constants of the upper and lower media.

[0026] Preferably, Δh in Formula 3 and Formula 4 is the vertical resolution, Δ x is the lateral resolution, λ=V / f is the wavelength of the electromagnetic wave, and H0 is the vertical ranging.

[0027] Preferably, when the electromagnetic wave velocity in the medium is known, the position and burial depth of the target object can be obtained based on the measured travel time.

[0028] Preferably, when high-frequency electromagnetic waves propagate in a medium, their propagation path, electromagnetic field strength and waveform characteristics will vary with the electrical characteristics and geometric shape of the medium.

[0029] Preferably, the radar antenna of the ground penetrating radar adopts a shielded antenna with a center frequency of 200-400 MHz.

[0030] After adopting the above method, the present invention has the following advantages:

[0031] The present invention reflects the electrical distribution of underground media through ground penetrating radar. As long as there is electrical difference in the underground medium, the corresponding reflected wave is found in the radar image profile to identify the reflected wave characteristics of various strata. In terms of detecting heavy metal pollution or leakage, it usually presents characteristics such as enhanced reflection, multiple reflections, and disordered phase axes.

[0032] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of electromagnetic wave propagation of the present invention.

[0035] Figure 2 It is a working schematic diagram of the present invention;

[0036] Figure 3 It is a schematic diagram of site division of the present invention;

[0037] Figure 4 It is a schematic diagram of the site survey line distribution of the present invention;

[0038] Figure 5 is a cross-sectional view of GPR1 of the present invention;

[0039] Figure 6 is a cross-sectional view of GPR2 of the present invention;

[0040] Figure 7 is a cross-sectional view of GPR3 ​​of the present invention;

[0041] Figure 8 is a cross-sectional view of GPR4 of the present invention;

[0042] Fig. 9 is a cross-sectional view of GPR5 of the present invention;

[0043] Fig.10 is a cross-sectional view of GPR6 of the present invention;

[0044] Fig.11 is a cross-sectional view of GPR7 of the present invention;

[0045] Fig.12 is a cross-sectional view of GPR8 of the present invention;

[0046] Fig.13 is a cross-sectional view of GPR9 of the present invention;

[0047] Fig.14 is a cross-sectional view of GPR10 of the present invention;

[0048] Fig.15 is a cross-sectional view of GPR11 of the present invention;

[0049] Fig.16 is a cross-sectional view of GPR12 of the present invention;

[0050] Fig.17 is a cross-sectional view of GPR13 of the present invention;

[0051] Fig.18 is a cross-sectional view of GPR14 of the present invention;

[0052] Fig.19 is a cross-sectional view of GPR15 of the present invention;

[0053] Fig. 20 is a cross-sectional view of GPR16 of the present invention;

[0054] Fig.21 is a cross-sectional view of GPR17 of the present invention;

[0055] Fig. 22 is a cross-sectional view of GPR18 of the present invention;

[0056] Fig.23 It is a cross-sectional view of GPR19 of the present invention. DETAILED DESCRIPTION

[0057] Specific embodiments of the present invention will now be mentioned in detail. Although the present invention is described in conjunction with these specific embodiments, it should be appreciated that it is not intended to limit the present invention to these specific embodiments. On the contrary, these embodiments are intended to cover substitutions, changes or equivalent embodiments that may be included in the spirit and scope of the invention defined by the claims. In the following description, a large number of specific details are set forth in order to provide a comprehensive understanding of the present invention. The present invention can be implemented without some or all of these specific details. In other cases, in order not to make the present invention unnecessarily obscure, well-known process operations are not described in detail.

[0058] When used in conjunction with "including," "methods comprising," or similar language in this specification and the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0059] The present invention is further described in detail below in conjunction with the full text.

[0060] Combined with Figure 1-Figure 3 , a method for quickly detecting land by ground penetrating radar, comprising the following steps:

[0061] S1. Regional division:

[0062] Before the detection work is carried out, the coordinates of the survey area are first established to determine the plane position of the survey line;

[0063] S2. Marking:

[0064] Use RTK to conduct geodetic work, arrange survey points according to the designed survey line, and mark them with spray paint;

[0065] S3. Parameter settings:

[0066] Select detection parameters for ground penetrating radar:

[0067] S4. Obtain radar profile information:

[0068] Engineering inspection that uses the electromagnetic wave reflection characteristics of the medium to detect the structure and defects inside the medium. The transmitting antenna of the ground penetrating radar transmits high-frequency electromagnetic waves to the detection object. When encountering different dielectric difference interfaces of different target bodies during the propagation process, part of the electromagnetic waves are reflected back and received by the receiving antenna and recorded by the host, thus obtaining the two-way path of the electromagnetic waves reflected from the transmitting antenna to the receiving antenna via the dielectric difference interface;

[0069] By collecting, processing and analyzing the time domain waveform, the spatial position and structural characteristics of the underground interface or geological body can be determined through the longitudinal and lateral resolutions of the ground penetrating radar;

[0070] S4. Data processing:

[0071] After the measurement is completed, the data will be promptly transferred to the computer for storage and subsequent processing;

[0072] The calculation formula for the refraction and reflection of the electromagnetic wave on the medium surface is as follows:

[0073]

[0074] The calculation formulas for the longitudinal resolution and lateral resolution shown are as follows:

[0075] Δ h =λ / 8-λ / 4Formula 3;

[0076]

[0077] The detection parameters include antenna center frequency, time window, sampling rate, distance between measuring points and distance between transmitting and receiving antennas.

[0078] The target bodies include rocks, soil, concrete, cavities, landfills, pollutants and pipelines.

[0079] In the formula 1 and the formula 2, R is the reflection coefficient, T is the refractive coefficient, and ε1 and ε2 are the dielectric constants of the upper and lower media.

[0080] Specifically, Figure 1 As shown in formula 1 and formula 2, ε1 and ε2 are the dielectric constants of the upper and lower media. From the above formulas, we can know that:

[0081] The larger the absolute value |R| of the reflection coefficient is, the stronger the amplitude of the reflected wave generated by the interface is; the smaller the absolute value |R| of the reflection coefficient is, the weaker the amplitude of the reflected wave generated by the interface is; the larger the absolute value |R| of the reflection coefficient is, the more conducive to detection is;

[0082] If the reflection coefficient R>0, the reflected wave is in phase with the incident wave; if the reflection coefficient R<0, the reflected wave is in anti-phase with the incident wave.

[0083] Under extreme conditions: the reflection coefficient R = 0, the electromagnetic wave directly penetrates the interface without reflection; the reflection coefficient R→∞, the electromagnetic wave is totally reflected and cannot penetrate the interface (such as when the antenna is located above the manhole cover).

[0084] The dielectric constant describes the polarization characteristics of the medium and reflects the ability of the medium to store charge in an electric field. It is usually described by the relative dielectric constant, which is the ratio of the dielectric constant of the medium to the dielectric constant of the vacuum.

[0085] The Δh in Formula 3 and Formula 4 shown is the vertical resolution, Δ x is the lateral resolution, λ=V / f is the wavelength of the electromagnetic wave, and H0 is the vertical distance measurement.

[0086] When the electromagnetic wave speed in the medium is known, the position and burial depth of the target object can be obtained based on the measured travel time.

[0087] When high-frequency electromagnetic waves propagate in a medium, their propagation path, electromagnetic field strength and waveform characteristics will change with the electrical characteristics and geometric shape of the medium.

[0088] The radar antenna of the ground penetrating radar adopts a shielded antenna with a center frequency of 200-400MHz. This ground penetrating radar detection uses Geopro-10 ground penetrating radar or a ground penetrating radar of the same type. The radar antenna adopts a shielded antenna with a center frequency of 200MHz.

[0089] The field workflow of ground penetrating radar is as follows:

[0090] Step 1: Before the detection work is carried out, the coordinates of the survey area must be established first in order to determine the plane position of the survey line;

[0091] Step 2: Use RTK to measure the land, lay out the measuring points according to the designed survey line, and mark them with spray paint;

[0092] Step 3: Reasonably select detection parameters, including antenna center frequency, time window, sampling rate, distance between measurement points and emission,

[0093] Receiving antenna spacing;

[0094] Step 4: Choose the signal acquisition method reasonably. Common acquisition methods include: profile method, transmission method and common depth point method;

[0095] Step 5: After setting the instrument parameters, move the ground penetrating radar equipment along the survey line to conduct continuous measurements and obtain radar profile information;

[0096] Step 6: After the measurement is completed, the data will be promptly transferred to the computer for storage and subsequent processing.

[0097] During the detection process of ground penetrating radar, due to the influence of factors such as the electromagnetic signals of the surrounding environment, the noise of the instrument itself and the complexity of the underground medium, the recorded signal will have many other interference factors in addition to the signal of the underground strata. These interference factors reduce the signal-to-noise ratio of the signal, cover up the real anomaly and often produce false anomalies, making the detection results inaccurate. Therefore, before using radar data to interpret the detection results, digital processing is required to suppress interference waves and improve the signal-to-noise ratio of the signal. The main task of ground penetrating radar data processing is to use the basic principles of radar detection and the propagation laws of electromagnetic waves in the medium and the methods of digital signal processing to effectively process the collected radar data on the computer, and obtain the information related to the location, shape, structure and size of the underground information contained in the record, so as to serve the later interpretation.

[0098] The field measurement data is transferred to the computer indoors, and the collected data is processed, analyzed and interpreted. The result map of each survey line is finally obtained by preprocessing the data file, gain adjustment, filtering and mapping. The process is: data input → data editing → background denoising → numerical filtering → time-depth conversion → graphic editing → output profile. After data processing of the ground penetrating radar detection data, data with a high signal-to-noise ratio can be obtained. However, to obtain the detection results, it is also necessary to combine geological data, road structure information, and municipal engineering information, try to eliminate false anomalies, obtain real underground structure information, make the radar detection information correspond to the actual road situation, obtain real road anomaly information, and make a reasonable explanation for the anomaly information.

[0099] The ground penetrating radar method is an engineering physical inspection method that uses the dielectric difference between different media and the reflection characteristics of the medium to detect the structure and defects (or other inhomogeneities) inside the medium. The working process of this method is: high-frequency electromagnetic waves (in the form of wide-band short pulses) are emitted to the detection object through the transmitting antenna. When it encounters the dielectric difference interface of different target bodies (rocks, soil, concrete, cavities, landfills, pollutants, pipelines, etc.) during the propagation process, part of the electromagnetic waves are reflected back and received by the receiving antenna and recorded by the host, thereby obtaining the two-way travel time of the electromagnetic wave reflected from the transmitting antenna to the receiving antenna through the dielectric difference interface. When the electromagnetic wave speed in the medium is known, the position and burial depth of the target body (such as Figure 1 As shown in Figure 2.2, when high-frequency electromagnetic waves propagate in a medium, their propagation path, electromagnetic field strength, and waveform characteristics will change with the electrical characteristics and geometric form of the medium. Therefore, by collecting, processing, and analyzing time domain waveforms, the spatial position and structural characteristics of underground interfaces or geological bodies can be determined.

[0100] Ground penetrating radar transmits electromagnetic waves into the detection body through the transmitting antenna and receives the reflected waves from the interface of the target body (such as Figure 1 As shown). According to the electromagnetic wave propagation theory, when electromagnetic waves pass through layered media, they encounter different media layers above and below, and the electromagnetic waves are refracted and reflected. The receiving antenna receives the echo information reflected by the medium, and the computer analyzes and processes the received signal and information. During the propagation of electromagnetic waves in the medium, its propagation speed V is mainly determined by the dielectric constant of the medium. When it encounters the boundary of a target body with a different dielectric constant from the surrounding, a reflected wave will be generated and received by the receiving antenna, thereby achieving the detection purpose.

[0101] The refraction and reflection characteristics of electromagnetic waves on the medium surface are represented by the refraction coefficient T and the reflection coefficient R. For non-magnetic media, when the electromagnetic wave is incident vertically, it can be represented by the following formula:

[0102]

[0103]

[0104] In actual work, the detection space medium does not completely meet the dielectric limit conditions, and its detection depth is inversely proportional to the environmental medium conductivity σ and the operating frequency f. The radar detection resolution is proportional to the operating frequency, and its longitudinal resolution Δh and lateral resolution Δx are:

[0105] Δ h =λ / 8-λ / 4Formula 3;

[0106]

[0107] The physical prerequisite for using this technology to detect underground diseased bodies and other adverse hidden dangers is that there is a certain difference in the electrical properties (especially dielectric properties) between the diseased body and the surrounding medium or between the defective abnormal body and the surrounding medium, and the dielectric constant of the medium depends on the material composition and structure of the material itself, porosity and water content and other main factors.

[0108] Experimental site:

[0109] The detection site is located in the industrial zone of Xindu Town, Xindu District, Chengdu. The small chrome plating workshop is located to the northwest of the enterprise, the large chrome plating workshop is located to the northeast, the decorative chrome plating workshop is located to the west (currently the galvanizing workshop), and the sewage treatment station is located to the southeast. These four areas are the key areas of concern. In addition, the boiler room (gas boiler) is located to the east, and the office building is located to the south. Figure 3 As shown,

[0110] Its main purpose is to find out the dominant distribution areas of groundwater in the land and possible pollution points.

[0111] According to interviews with factory personnel and existing data, the enterprise was an empty lot before the factory was built. The historical use of the enterprise site is shown in Table 1.

[0112] Table 1 Historical use of the site

[0113]

[0114]

[0115] The area surrounding the enterprise is all second-class construction land, with Dichuan Plastic to the southwest of the factory, factory buildings to the west, Tuanjie Chemical to the north, Xindu Chemical to the northeast, and Xinghua Trading to the east.

[0116] The work process includes data collection and on-site investigation in the survey area, geophysical detection, data analysis and interpretation, and delineation of contaminated areas.

[0117] Ground Penetrating Radar Data Collection

[0118] The results of geophysical exploration are easily affected by factors such as on-site interference, space limitations, and operational impacts. In an operating factory, due to the presence of process buildings and machinery, the on-site conditions are complex and there are many sources of interference. At the same time, the safety of construction and investigation personnel must be considered, and the investigation area is easily restricted. Therefore, in the application of in-operation factory area investigation, overcoming noise interference is the primary task. If noise interference cannot be overcome, the relative results will also be affected. Therefore, the reasonable layout of the survey line is the primary task to obtain high-quality data.

[0119] Due to the influence of buildings, it is impossible to conduct grid wiring detection in the entire area during GPR detection. In order to obtain better data, multiple parallel measurement lines are arranged in key areas of the investigation area for investigation. Figure 4 The arrangement table of the survey line is shown below:

[0120]

[0121]

[0122] Ground penetrating radar mainly reflects the distribution of underground medium electrical properties (dielectric constant). As long as there is electrical difference in underground medium, the corresponding reflection wave can be found in the radar image profile to identify the reflection wave characteristics of various strata. In terms of detecting heavy metal pollution or leakage, it usually presents characteristics such as reflection enhancement, multiple reflections, and disordered phase axis.

[0123] The radar profile shows that the anomalies in the survey area are basically shallower than 1m. Since there are many ground penetrating radar lines in the survey area, the profile below is explained.

[0124] The site was tested based on 19 survey lines GPR-1 to GPR-19. According to the method of the invention for rapid land detection by ground penetrating radar, the experimental results are as follows:

[0125] Embodiment 1:

[0126] like Figure 5 As shown in the figure, the GPR1 survey line is located in the middle of the survey area, between the galvanizing workshop and the sewage treatment plant, and close to the galvanizing workshop, and is laid out from southwest to northeast. The overall analysis of the data results is as follows: In the range of 9 to 10m, the phase axis is hyperbolic, with multiple reflections and strong amplitude characteristics, which is a canal. In the range of 24 to 25m, the phase axis is broken and has strong amplitude characteristics, which is a sewage pipe.

[0127] Embodiment 2:

[0128] like Figure 6 As shown, the GPR2 survey line is located in the middle of the survey area, between the galvanizing workshop and the sewage treatment plant, and is laid out from south-west to northeast. The overall analysis of the data results is as follows: In the range of 9-10m, the phase axis is hyperbolic, with multiple reflections and strong amplitude characteristics, which is a canal. In the range of 24-25m, the phase axis is broken and has strong amplitude characteristics, which is a sewage pipe. In the range of 37-38m, strong amplitude, low frequency, and multiple reflection characteristics are water channels.

[0129] Embodiment three:

[0130] like Figure 7 As shown, the GPR3 ​​survey line is located in the middle of the survey area, between the galvanizing workshop and the sewage treatment plant, and is laid out from south-west to northeast. The overall analysis of the data results is as follows: In the range of 9-10m, the event axis is hyperbolic, with multiple reflections and strong amplitude characteristics, which is a canal. In the range of 24-25m, the event axis is broken and has strong amplitude characteristics, which is a sewage pipe. In the range of 37-38m, strong amplitude, low frequency, and multiple reflection characteristics are characteristics of a canal.

[0131] Embodiment 4:

[0132] like Figure 8 As shown in the figure, the GPR4 survey line is located in the middle of the survey area, between the galvanizing workshop and the sewage treatment plant, and is laid out from south-west to northeast. The overall analysis of the data results is as follows: In the range of 9 to 10m, the phase axis is in a hyperbolic shape, with multiple reflections and strong amplitude characteristics, which is a canal. In the range of 27 to 28m, the phase axis is in a hyperbolic shape with strong amplitude characteristics, which is a sewage pipe.

[0133] Embodiment five:

[0134] like Fig. 9As shown, the GPR5 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4m, the phase axis is in a hyperbolic shape with strong amplitude characteristics, which is a pipeline. In the range of 18-20m, the phase axis is in a hyperbolic shape with strong amplitude characteristics, which is presumed to be a pipeline.

[0135] Embodiment six:

[0136] like Fig.10 As shown, the GPR6 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4m, the phase axis is hyperbolic with strong amplitude characteristics, which is a pipeline. In the range of 18-20m, the phase axis is hyperbolic with strong amplitude characteristics, which is presumed to be a pipeline.

[0137] Embodiment seven:

[0138] like Fig.11 As shown, the GPR7 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4m, the phase axis is hyperbolic and has strong amplitude characteristics, which is a pipeline. In the range of 18-20m, the 200MHZ phase axis is hyperbolic, and 400MHZ has multiple reflection characteristics, which is presumed to be a pipeline.

[0139] Embodiment eight:

[0140] like Fig.12 As shown, the GPR8 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4m, the phase axis is hyperbolic with strong amplitude characteristics, which is a pipeline. Near 8-9m, the 200MHZ phase axis is hyperbolic with strong amplitude characteristics, which is speculated to be a pipeline or local void. In the range of 18-19m, the 200MHZ phase axis is hyperbolic with strong amplitude characteristics, and 400MHZ is hyperbolic, which is speculated to be a pipeline.

[0141] Embodiment nine:

[0142] like Fig.13 As shown, the GPR9 survey line is located in the northern part of the survey area, between the small chrome plating workshop and the large chrome plating workshop, and is laid out from the southwest to the northeast. The overall analysis of the data results is as follows: near 6-7m, the event axis is in a hyperbola shape, which is a pipeline. Near 8-9m, the event axis is in a hyperbola shape, which is a pipeline. In the range of 11-12m, the event axis is in a hyperbola shape, which is speculated to be an underground pipeline. In the range of 29-30m, the event axis is in a hyperbola shape, which is speculated to be an underground pipeline.

[0143] Embodiment ten:

[0144] like Fig.14 As shown, the GPR10 survey line is located in the northern part of the survey area, between the small chrome plating workshop and the large chrome plating workshop, and is laid out from the southwest to the northeast. The overall analysis of the data results is as follows: near 6 to 7m, the event axis is in a hyperbola shape, which is a pipeline. Near 8 to 9m, the event axis is in a hyperbola shape, which is a pipeline. In the range of 11 to 12m, the event axis is in a hyperbola shape, which is speculated to be an underground pipeline. In the range of 29 to 30m, the event axis is in a hyperbola shape, which is speculated to be an underground pipeline.

[0145] Embodiment eleven:

[0146] like Fig.15 As shown in the figure, the GPR11 survey line is located in the northern part of the survey area, between the small chrome plating workshop and the large chrome plating workshop, and is laid out from the southwest to the northeast. The overall analysis of the data results is as follows: near 6 to 7 meters, the phase axis is in a hyperbola shape, which is a pipeline. Near 8 to 9 meters, the phase axis is in a hyperbola shape, which is a pipeline. In the range of 11 to 12 meters, the phase axis is in a hyperbola shape, which is presumed to be an underground pipeline.

[0147] The overall analysis of the data results is as follows: At around 28-29m, the event axis is in a hyperbola shape, which is presumed to be a pipeline. At 42-50m, the event axis is in a strong amplitude, low frequency, and multiple oscillations. Metal devices are piled up around this section, and the abnormal radar image is an interference anomaly.

[0148] Embodiment 12:

[0149] like Fig.16 As shown in the figure, the GPR12 survey line is located in the northern part of the survey area, between the small chrome plating workshop and the large chrome plating workshop, and is laid out from the southwest to the northeast. The overall analysis of the data results is as follows: near 6m, the phase axis is in a hyperbola shape, which is speculated to be a pipeline. In the 7-8m section, the phase axis is in a hyperbola shape, which is a surface pipeline. In the 10-11m range, the phase axis is in a hyperbola shape, which is speculated to be an underground pipeline.

[0150] The overall analysis of the data results is as follows: near 27m, the event axis is in a hyperbola shape, which is presumed to be a pipeline. In the 41-42m section, the event axis is in a strong amplitude, low frequency, and multiple oscillations. Metal devices are piled up around this section, and the radar abnormal image is an interference anomaly.

[0151] Embodiment 13:

[0152] like Fig.17 As shown in the figure, the GPR13 survey line is located in the northern part of the survey area, between the small chrome plating workshop and the large chrome plating workshop, and is laid out from the southwest to the northeast. The overall analysis of the data results is as follows: near 6 to 7 meters, the phase axis is in a hyperbola shape, which is speculated to be a pipeline. Near 7 meters, the phase axis is in a hyperbola shape, which is a surface pipeline. In the range of 10 to 11 meters, the phase axis is in a hyperbola shape, which is speculated to be an underground pipeline.

[0153] Embodiment 14:

[0154] like Fig.18 As shown, the GPR14 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4-5m, the event axis is in a hyperbola shape, which is speculated to be a pipeline. Near 10m, the event axis is in a hyperbola shape, which is an underground pipeline. Near 22m, the event axis has a strong amplitude, which is speculated to be an underground pipeline. Near 27-28m, the event axis has a strong amplitude and low frequency, which is a drainage ditch.

[0155] Embodiment 15:

[0156] like Fig.19 As shown, the GPR15 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4-5m, the phase axis is hyperbolic, which is speculated to be a pipeline. Near 10m, the phase axis is hyperbolic, which is an underground pipeline. Near 15-16m, the phase axis is hyperbolic with strong amplitude, which is speculated to be an underground pipeline or empty. Near 27-29m, the phase axis is strong amplitude and low frequency, which is a drainage ditch.

[0157] Embodiment 16:

[0158] like Fig. 20 As shown, the GPR16 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4-5m, the phase axis is hyperbolic, which is speculated to be a pipeline. Near 10m, the phase axis is hyperbolic, which is an underground pipeline. Near 15-16m, the phase axis is hyperbolic with strong amplitude, which is speculated to be an underground pipeline or empty. Near 27-29m, the phase axis is strong amplitude and low frequency, which is a drainage ditch.

[0159] Embodiment 17:

[0160] like Fig.21 As shown, the GPR17 survey line is located in the south-central part of the survey area, between the galvanizing workshop and the office, and is laid out from northwest to southeast. The overall analysis of the data results is as follows: near 4-6m, the phase axis is hyperbolic, which is speculated to be a pipeline. Near 10-11m, the phase axis is hyperbolic, which is an underground pipeline. Near 15-16m, the phase axis is hyperbolic with strong amplitude, which is speculated to be an underground pipeline or empty. Near 25-27m, the phase axis is strong amplitude and low frequency, which is a drainage ditch.

[0161] Embodiment 18:

[0162] like Fig. 22As shown, the GPR18 survey line is located in the southern part of the survey area, in front of the office door, and runs from northwest to southeast. The overall analysis of the data results is as follows: near 4-6m, the phase axis is in a hyperbolic shape, which is speculated to be a pipeline. Near 9m, the phase axis is in a hyperbolic shape with strong amplitude characteristics, which is speculated to be an underground pipeline.

[0163] Embodiment 19:

[0164] like Fig.23 As shown, the GPR19 survey line is located in the west of the survey area, on the west side of the office and galvanizing workshop, and is laid out from south-west to northeast. The overall analysis of the data results is as follows: near 32-33m, the event axis is in a hyperbola shape, which is speculated to be a pipeline. Near 74-75m, the event axis is in a hyperbola shape with strong amplitude characteristics, which is speculated to be an underground pipeline.

[0165] The present invention and its embodiments are described above, and such description is not restrictive. What is shown in the full text is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for quickly detecting land by ground penetrating radar, characterized in that: The following steps are involved: S1. Regional division: Before the detection work is carried out, the coordinates of the survey area are first established to determine the plane position of the survey line; S2. Marking: Use RTK to conduct geodetic work, arrange survey points according to the designed survey line, and mark them with spray paint; S3. Parameter settings: Select detection parameters for ground penetrating radar: S4. Obtain radar profile information: Engineering inspection that uses the electromagnetic wave reflection characteristics of the medium to detect the structure and defects inside the medium. The transmitting antenna of the ground penetrating radar transmits high-frequency electromagnetic waves to the detection object. When encountering different dielectric difference interfaces of different target bodies during the propagation process, part of the electromagnetic waves are reflected back and received by the receiving antenna and recorded by the host, thus obtaining the two-way path of the electromagnetic waves reflected from the transmitting antenna to the receiving antenna via the dielectric difference interface; By collecting, processing and analyzing the time domain waveform, the spatial position and structural characteristics of the underground interface or geological body can be determined through the longitudinal and lateral resolutions of the ground penetrating radar; S4. Data processing: After the measurement is completed, the data will be promptly transferred to the computer for storage and subsequent processing; The calculation formula for the refraction and reflection of the electromagnetic wave on the medium surface is as follows: The calculation formulas for the longitudinal resolution and lateral resolution shown are as follows:

2. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: The detection parameters include antenna center frequency, time window, sampling rate, distance between measuring points and distance between transmitting and receiving antennas.

3. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: The target bodies include rocks, soil, concrete, cavities, landfills, pollutants and pipelines.

4. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: In the formula 1 and the formula 2, R is the reflection coefficient, T is the refractive coefficient, and ε1 and ε2 are the dielectric constants of the upper and lower media.

5. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: The Δh in Formula 3 and Formula 4 shown is the vertical resolution, Δ x is the lateral resolution, λ=V / f is the wavelength of the electromagnetic wave, and H0 is the vertical ranging.

6. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: When the electromagnetic wave speed in the medium is known, the position and burial depth of the target object can be obtained based on the measured travel time.

7. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: When high-frequency electromagnetic waves propagate in a medium, their propagation path, electromagnetic field strength and waveform characteristics will change with the electrical characteristics and geometric shape of the medium.

8. The method for quickly detecting land by ground penetrating radar according to claim 1, characterized in that: The radar antenna of the ground penetrating radar adopts a shielded antenna with a center frequency of 200-400MHz.

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