34 results about "Borehole radar" patented technology

The invention provides a drill hole joint detection method and system capable of reducing the number of advance drill holes in a tunnel roadway, and relates to the field of roadway engineering detection, and the method comprises the steps: obtaining the depth of a measurement point and the radar data and transient electromagnetic data of a target region, and enabling the radar data and the transient electromagnetic data to be collected through an integrated detection device in a drill hole; performing feature extraction on the radar data and the transient electromagnetic data, and fusing the extracted features based on contribution weights of the radar and the transient electromagnetism to obtain a fused feature vector; based on the depth of the measuring point and the fused feature vector, utilizing the trained physical information neural network to invert the dielectric constant and the resistivity; according to the dielectric constant and the resistivity, the geological anomalous body of the target area is identified; according to the invention, the drilling radar and the drilling transient electromagnetism are combined, so that the number of advanced drilling holes is reduced, the detection cost is reduced, and the full-area coverage of the forepoling of the roadway is ensured.

A soft rock roadway reinforced roof anchoring thickness collaborative design method comprises the steps that the proportion of grout filling cracks in a grouting reinforcement area is counted, a grouting dispersion uniformity index is calculated, and grouting effect evaluation is conducted; measuring the actual boundary depth of the grouting reinforcement area by adopting a method of combining drilling radar scanning and rock core sampling; mechanical parameters of the grouted rock mass are obtained, and a grouting enhancement coefficient is calculated; a stress transfer efficiency evaluation model is established, and the critical cooperative bearing surface depth is determined by analyzing the stress attenuation law at the boundary of the grouting reinforcement area; the critical anchoring layer thickness is calculated under the constraint condition that it is ensured that an anchoring system can effectively penetrate through a grouting strengthening area and go deep into a stable rock stratum; the cooperative work performance of a grouting reinforcement area and an anchoring system is quantitatively evaluated by calculating a system cooperation degree index, and a cooperative bearing efficiency evaluation system based on dynamic risk grading and control is established. According to the method, collaborative optimization of grouting and anchoring parameters can be achieved, and formation of a bolting-grouting integrated bearing structure can be ensured.

The invention relates to a directional drilling radar antenna and an implementation method thereof. The directional drilling radar antenna comprises a metal radiation sheet, a dielectric substrate, a loading resistor, a loading medium, a metal reflecting plate and a loading capacitor. Carrying out distributed resistance loading on the antenna arm, defining the resistance value of a loading resistor at the tail end, and optimizing other resistors; an exponential gradual change structure is arranged at a feeding point to suppress the input impedance change of the antenna, and a semi-elliptical arc structure is arranged at the tail end; a loading medium and a reflecting plate are introduced, the distance between the metal reflecting plate and the antenna is adjusted along with the change of the dielectric constant of the dielectric substrate, and the beam width of the antenna is adjusted; the drill hole radar is placed in a drill hole to trigger pulses at specified time, the antenna transmits electromagnetic waves to the periphery of the drill hole and receives the electromagnetic waves, and the drill hole radar moves along the drill hole to successively obtain all stratum information of the whole drill hole. Electromagnetic wave directional emission and receiving or directional accurate detection of target objects in a narrow frequency band of a single frequency and around a drill hole is realized.

The invention discloses a tunnel face and borehole geological radar combined advanced forecasting detection method and system. The method mainly comprises the steps that a tunnel face and drilling geological radar integrated host is developed, joint collection of a tunnel face and a drilling radar is achieved, a ground penetrating radar of the tunnel face is used for transmitting electromagnetic waves, an antenna on one side of the drilling radar is used for transmitting the electromagnetic waves, and an antenna on the other side of the drilling radar and the ground penetrating radar of the tunnel face receive the electromagnetic waves. The tunnel face ground penetrating radar and drilling radar combined observation system is designed, all-directional and multi-angle ray coverage is achieved, and the observation data volume is increased; deriving calculation formulas such as tunnel ground penetrating radar forward modeling, an adjoint state method, a target function, an error inverse function and the like to realize tunnel ground penetrating radar full-waveform inversion; and quasi-three-dimensional fine detection imaging of unfavorable geologic bodies such as karst caves and broken bodies in front of the tunnel face can be realized.

The invention relates to the field of drilling radars, in particular to an angle monitoring and signal transmitting device of a directional drilling radar rotating assembly and an installation method of the angle monitoring and signal transmitting device. The angle monitoring and signal transmitting device comprises a carrying plate shaft, a first slip ring, a first slip ring mounting cylinder, a second slip ring, a second slip ring mounting cylinder, an encoder and an encoder mounting cylinder. When the radar works, the rotating motion of the internal rotating assembly is transmitted to the encoder through the carrying plate shaft, the encoder records the number of pulses generated by the encoder, and the rotating angle of the assembly is speculated based on the number, and angle homing is achieved; and detection information acquired by the radar control and data acquisition card is transmitted to an interface at the end part of the radar through wires of the first slip ring and the second slip ring, so that signal transmission is completed. The angle monitoring device and the signal transmission device are integrally designed, the structure is compact, and the internal space of the radar antenna can be effectively saved. The signal transmission device adopts a multi-slip-ring serial connection structure, the slip rings do not need to be customized, and the radar development cost is greatly saved while the signal transmission function is achieved.

1. Name of the product in this design: Intrinsically Safe Drilling Radar Detector Tube for Mining. 2. Purpose of this design: For the transmission of high-frequency radar waves and the acquisition and storage of transmitted signals. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The application discloses a borehole surrounding rock mass structure optical-radar combined directional imaging method and equipment, comprising the following steps: S1, optical detection of a borehole inner wall is carried out by using a borehole television optical probe, and a borehole wall two-dimensional imaging profile is acquired; S2, rock mass structure surface morphological parameters are identified and extracted according to the borehole wall two-dimensional imaging profile; S3, borehole surrounding structure detection is carried out by using a borehole radar probe; S4, radar signal profile signal processing and migration imaging are carried out, and an imaging profile of a borehole surrounding rock mass structure surface is acquired; and S5, three-dimensional modeling of the rock mass structure surface is carried out. The borehole optical-radar combined observation provides more optical geological prior information, helps directional imaging rock mass structure identification, realizes multi-element data fusion in the rock mass structure surface inversion process, and completes fine identification of the rock mass structure surface.

The present invention provides a method and equipment for advanced fine detection of gas geological anomalies in an excavation working face. By using the in-situ measurement method of the relative dielectric constant of coal in coal mines, the propagation speed and relative dielectric constant of electromagnetic waves in the front coal body are accurately calculated. Three boreholes not in the same plane are selected to carry out borehole radar advanced detection work respectively. A borehole trajectory instrument is used to detect the drilling trajectories of the three boreholes respectively. Based on the time-domain profile of the borehole radar detection results and the spatial coordinates of the borehole trajectories, the spatial position of the geological structure can be accurately identified. Combining the information on the lithology change characteristics during the drilling process, the key information such as the type, scale and accurate spatial position of the geological structure in front of the excavation working face can be comprehensively identified. Through the present invention, the advanced fine detection and three-dimensional transparent characterization of hidden small-scale structures in front of the excavation working face can be realized, meeting the outburst prevention requirements of the excavation working face and the construction trend of a transparent working face in an intelligent mine.

The invention discloses an anomalous body directional detection method and device based on a borehole radar, and belongs to the technical field of borehole radar detection, and the method comprises the steps: obtaining a plurality of azimuth angles of the borehole radar during testing, and a radar image map corresponding to each azimuth angle; determining the electromagnetic wave propagation velocity of the space where the anomalous body is located based on the radar images, and performing migration imaging on each radar image based on the electromagnetic wave propagation velocity to obtain a plurality of migration images; and determining a plurality of maximum reflection energies of the plurality of offset images, and performing weighted calculation on the plurality of azimuth angles through the plurality of maximum reflection energies to determine a target azimuth angle of the anomalous body. By taking the maximum reflection energy of the offset image as a reference quantity, weighting calculation is carried out on a plurality of azimuth angles corresponding to the radar image map, and the target azimuth angle of the anomalous body can be accurately determined.

This invention discloses a method and system for joint advanced prediction and detection of tunnel face and borehole ground-penetrating radar. It mainly includes: developing an integrated host for tunnel face and borehole ground-penetrating radar, achieving joint data acquisition from both; utilizing the tunnel face ground-penetrating radar to emit electromagnetic waves, with one antenna of the borehole radar emitting electromagnetic waves, and the other antenna of the borehole radar and the tunnel face ground-penetrating radar receiving the electromagnetic waves. This application designs a joint observation system for tunnel face ground-penetrating radar and borehole radar, achieving omnidirectional, multi-angle ray coverage and increasing the amount of observation data; deriving calculation formulas for tunnel ground-penetrating radar forward modeling, the adjoint state method, the objective function, and the inverse error function, achieving full waveform inversion of tunnel ground-penetrating radar; and enabling near-three-dimensional fine detection and imaging of adverse geological bodies such as karst caves and fractured bodies in front of the tunnel face.

The invention discloses a borehole radar omni-directional detection and imaging method, and the method mainly comprises the steps: enabling an omni-directional detection data collection mode to be divided into a preset angle directional collection mode and a 360-degree rotation collection mode; wherein the preset angle directional acquisition is that directional continuous acquisition is carried out on a radiating surface of a borehole radar antenna according to set n angle directions, and data of each measuring line radar and movement speeds V1, V2... Vn of the borehole radar are acquired respectively; according to 360-degree rotation collection, the drilling radar is controlled by the driving device to conduct rotation collection at a fixed angular velocity W, and surrounding omnidirectional detection radar data and drilling radar moving speed V0 information are obtained through one-time detection. The three-dimensional imaging method mainly comprises the following steps: (1) preprocessing and enhancing acquired radar data, removing background noise, suppressing random noise, and improving the signal-to-noise ratio of signals; (2) correction is carried out according to the recorded coordinates, and channel spacing normalization processing is mainly carried out on data of each measuring line for data directionally collected at a preset angle; the data acquired by 360-degree rotation is mainly obtained by calculating azimuth information of each channel of data of corresponding radar data according to W and V0; and (3) under a unified coordinate system, performing interpolation and imaging processing on radar interpretation result data, and displaying abnormal body information by taking the drill hole as a center.

This invention relates to a directional borehole radar antenna and its implementation method, comprising a metal radiating plate, a dielectric substrate, a loading resistor, a loading dielectric, a metal reflector, and a loading capacitor. Distributed resistance loading is applied to the antenna arm, defining the resistance value of the end loading resistor and optimizing other resistors; an exponentially tapered structure is set at the feed point to suppress changes in the antenna input impedance, and a semi-elliptical arc structure is set at the end; a loading dielectric and a reflector are introduced, the distance between the metal reflector and the antenna is adjusted according to the dielectric constant of the dielectric substrate, and the antenna beamwidth is also adjusted; the borehole radar is placed inside the borehole and a trigger pulse is applied at a specified time, causing the antenna to transmit and receive electromagnetic waves around the borehole. The borehole radar moves along the borehole, successively acquiring all stratigraphic information of the entire borehole. This achieves directional transmission and reception of electromagnetic waves, or directional and precise detection of target objects within a narrow frequency band and around the borehole.

The utility model provides a two-section type multifunctional self-storage drilling radar structure. The two-section type multifunctional self-storage drilling radar structure comprises a guide cone; the antenna short section lower connector is arranged at one end of the outer side face of the guide cone, an antenna short section shell is arranged on the outer side face of the antenna short section lower connector, and an antenna protection shell is arranged on the inner side face of the antenna short section shell. When the two-section type multifunctional self-storage drilling radar structure provided by the utility model does not work, a drilling radar is disassembled into the antenna short section and the circuit short section, and the antenna short section upper cap and the circuit short section upper cap are screwed on the joints of the two short sections so as to protect an instrument; in this way, subsequent transportation by a user is facilitated; when the drilling radar needs to work, the antenna short section upper connector and the circuit short connection lower connector are connected, the two short sections can be spliced into the complete self-storage type drilling radar, and operation is convenient and fast.

A karst unfavorable geologic body identification method combining borehole radar electromagnetic wave propagation characteristics and inversion imaging comprises the following steps: (1) testing a frequency domain complex dielectric constant of a borehole sample, and calculating a frequency dispersion parameter; (2) carrying out drilling radar electromagnetic wave propagation forward modeling simulation of the unfavorable karst geologic body in consideration of frequency dispersion attenuation characteristics to obtain single-hole and cross-hole radar electromagnetic wave propagation characteristics and optimal detection parameters; (3) carrying out single-hole radar detection on the surrounding karst unfavorable geologic body, and identifying the type and the distribution range of the karst unfavorable geologic body around the drill hole in combination with the electromagnetic wave propagation characteristics of the single-hole radar; (4) carrying out cross-hole radar detection and cross-hole radar inversion imaging, and judging the type, spatial distribution and filling property of the karst unfavorable geologic body in combination with cross-hole radar electromagnetic wave propagation characteristics; and (5) combining the drilling result and the single-hole and cross-hole detection results, optimizing the geologic structure model, and finely identifying the unfavorable karst geologic body. By adopting the method, the type, the spatial distribution and the filling property of the unfavorable karst geologic body can be accurately identified, and the method has important significance in guaranteeing the engineering construction safety and reducing casualties and property loss.

The invention relates to a borehole radar bedding hole coal thickness detection interlayer multiple extraction method comprising the following steps: carrying out discrete wavelet transformation on each channel of transformed signals based on Gaussian tuning wavelets under each signal decomposition frequency to obtain each channel of discrete wavelet transformation result under each signal decomposition frequency; for each signal decomposition frequency, drawing a discrete wavelet transform profile map based on each discrete wavelet transform result; determining a target discrete wavelet transform profile map meeting interlayer multiple features in all the discrete wavelet transform profile maps; and determining time information corresponding to the interlayer multiples according to the target discrete wavelet transform profile map. Under the influence of horizontal interference between instrument channels, time information corresponding to interlayer multiples can be effectively extracted.

The invention relates to the technical field of coal mine exploration, and discloses an auxiliary device for horizontal drilling radar patrol, a supporting base and a drilling radar, the bottom of the supporting base is fixedly connected with a mounting frame, walking wheels are symmetrically mounted on the mounting frame, movable grooves are symmetrically formed in the outer portion of the supporting base, and a movable rod is arranged in each movable groove; the movable rod is fixedly connected with a fixed shaft, the bottom of the fixed shaft is movably connected to the inner bottom face of the supporting base through a bearing, a cleaning plate is installed at the bottom of the movable rod, and a cleaning mechanism for driving the movable rod to move is arranged in the supporting base. The clean drilling environment can reduce noise in an image during detection of the drilling radar, images of a stratum structure and an abnormal body are clearer, subsequent data analysis and interpretation are facilitated, the drilling radar can move in the drilling hole more smoothly after the drilling hole is cleaned, detection interruption caused by obstacles in the drilling hole is reduced, and the detection efficiency is effectively improved.

The application relates to the technical field of communication antenna equipment, in particular to a wideband monopole miniaturized antenna for a borehole radar and a communication device. The antenna comprises a first structure and a second structure; the first structure comprises a second connecting rod and an antenna unit, one end of the second connecting rod is connected with a feed source, and the other end is connected with the antenna unit; the second structure comprises five dumbbell-shaped units; wherein, two adjacent dumbbell-shaped units and the first structure and the second structure are connected through electronic components; the dumbbell-shaped unit comprises a first connecting rod and an antenna unit arranged at two ends of the first connecting rod. The application adopts the form of a monopole antenna, so that the size of the antenna body is shortened by half, and cost is saved; the dumbbell-shaped unit is proposed, and a dielectric loading method is adopted; through calculation of the loading resistor position and parameters and adjustment of the geometric proportion of the antenna body shape, the bandwidth of the borehole antenna is increased, and the detection precision of the borehole radar is improved.

The present invention relates to the field of borehole radar, and particularly to a cap-type conductive slip ring installation structure for a directional borehole radar. The cap-type conductive slip ring installation structure includes a slip ring installation sleeve, a bearing, a mounting plate, and a cap-type conductive slip ring; the slip ring installation sleeve is provided with a slip ring accommodation hole and a bearing accommodation hole, the outer stator of the cap-type conductive slip ring is fixed in the slip ring accommodation hole, and the outer ring of the bearing is installed on the bearing accommodation hole; one end of the mounting plate is provided with a connecting column, the inside of the connecting column is a through hole, the connecting column passes through and is fixed on the inner ring of the bearing, and the inner rotor of the cap-type conductive slip ring is fixedly accommodated in the through hole inside it. Compared with the traditional installation method of the cap-type conductive slip ring, by introducing a bearing at the installation location, the structure obtained by the present invention can, while ensuring the normal operation of the cap-type conductive slip ring, also resist the bending moment caused by external forces during radar assembly, protect the fragile inner rotor in the slip ring, and significantly improve the connection strength at the installation location of the cap-type conductive slip ring.

The utility model discloses an intrinsic safety type handheld terminal for borehole radar data acquisition. The intrinsic safety type handheld terminal comprises a main shell, a front cover, a two-core aviation plug, a four-core aviation plug, a power switch, a hand guard, a standby switch, a return switch and a screenshot switch, the lithium iron phosphate lithium ion battery pack, the intrinsic safety power panel and the battery electric quantity acquisition circuit board are arranged on the main shell, and the display screen pressing plate, the display screen, the Android mainboard radiator, the Android mainboard and the switching signal conversion board are arranged on the front cover. The device can be used under multiple working conditions of the ground, the underground coal mine and the petrochemical engineering field, and parameter configuration, measurement data acquisition, measurement data display and storage of the drilling radar are realized; real-time transmission of radar data can be realized based on an Ethernet port transmission mode, and radar data synchronization can also be realized based on a wireless WiFi transmission mode; the device has the remarkable advantages of small size, light weight, portability, low cost and multi-channel data transmission, and meets the national related standard requirements of mining products.

The invention discloses a variable-frequency drilling radar antenna and a method. The variable-frequency drilling radar antenna comprises a three-stage sleeve type telescopic radiator, a control system, a traction device, a displacement sensor, a limiting device, an impedance switcher, a pulse source circuit board and an acquisition circuit board. According to the invention, through a three-stage sleeve type telescopic structure, continuous variation of the physical length of the antenna is realized in a standard drill hole with the diameter of 76mm, so that a frequency adjustment range of 100-400MHz is obtained; the mechanical structure realizes large-range step switching of frequency, and the circuit switching performs frequency fine tuning and impedance optimization on each step point, so that the overall impedance matching efficiency is improved to more than 85%, and the radiation efficiency under each frequency point is ensured; a single antenna can replace a plurality of traditional fixed-frequency antennas, so that the equipment cost and the line changing time of single-hole operation are greatly reduced; according to the impedance self-adaptive matching link based on the dielectric electric constant, matching parameters can be dynamically optimized according to actual slurry in the drill hole or the stratum environment, and the signal quality under different depths and different stratum conditions is improved.

The invention discloses a geologic body three-dimensional reconstruction method and device based on multi-source data fusion, and the method comprises the steps: obtaining drilling radar original data and azimuth gamma original data of a target region, and correcting the drilling radar original data and the azimuth gamma original data, the corrected drilling radar data and the corrected azimuth gamma data are obtained; generating a radar reflection profile map based on the corrected drilling radar data; generating a gamma azimuth imaging graph based on the corrected azimuth gamma data; inputting the radar reflection profile map and the gamma azimuth imaging map into a target analysis model to obtain a geologic body radial distance map; and performing geologic body three-dimensional reconstruction of the target area through the geologic body radial distance map to obtain a geologic body three-dimensional reconstruction model. According to the invention, accurate positioning of the geologic body around the drill hole is realized, and the accuracy of the three-dimensional reconstruction model is improved.

This invention relates to the field of ground-penetrating radar detection and civil engineering structure inspection technology, and discloses an anchor cable positioning method based on single-hole radar waveform characteristics and dual-hole geometric constraints, including the following steps: Step 1: Construct at least two parallel boreholes, acquire borehole wall images through borehole optical imaging, and identify geological information based on the images; Step 2: Perform single-hole reflection scanning and cross-hole multi-offset scanning using a single-polarization borehole radar to acquire single-hole reflection data and cross-hole scanning data; Step 3: Based on the cross-hole scanning data, invert and construct an inter-hole electromagnetic wave velocity field model; Step 4: Use geological information as constraints to correct the inter-hole electromagnetic wave velocity field model; Step 5: Based on the inter-hole electromagnetic wave velocity field model, perform offset processing on the single-hole reflection data of each borehole to obtain a radar profile; thereby achieving precise positioning of oblique anchor cables through algorithmic innovation.

The present disclosure provides a drilling combined detection method and system which can reduce the number of advanced drilling in a tunnel, relates to the field of roadway engineering detection, and comprises the following steps: obtaining radar data and transient electromagnetic data of a measurement point depth and a target area, wherein the radar data and the transient electromagnetic data are collected by an integrated detection device in a drilling; performing feature extraction on the radar data and the transient electromagnetic data respectively, fusing the extracted features based on the contribution weights of the radar and the transient electromagnetic, and obtaining a fused feature vector; inverting the dielectric constant and the resistivity by using a trained physical information neural network based on the measurement point depth and the fused feature vector; and identifying a geological abnormal body in the target area according to the dielectric constant and the resistivity. The present disclosure combines drilling radar and drilling transient electromagnetic, reduces the number of advanced drilling, reduces the detection cost, and ensures full-area coverage of roadway pre-probing.

1. Name of the product in this design: Handheld Terminal (Intrinsically Safe for Mining). 2. Purpose of this design: For configuring borehole radar parameters, acquiring measurement data, displaying and storing measurement data, and transmitting data in real time. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention provides an anti-sliding key construction method, and belongs to the technical field of geotechnical engineering pile foundations. The anti-sliding key construction method comprises the steps that drilling is conducted from the ground to a stable stratum, reaming is conducted within a set depth range, a drilling radar and a grouting pipe are lowered to a reaming area, and grouting is conducted through the grouting pipe; starting the drilling radar to transmit electromagnetic waves and receive reflected electromagnetic waves; in the grouting process, the drilling radar and the grouting pipe are gradually lifted upwards till the drilling radar is lifted out of a drilling area, an image obtained by the drilling radar is analyzed, and whether holes or cracks appear in the anti-sliding key or not is judged; and if holes appear, evaluating the influence degree of the holes or cracks on the anti-feather key quality. The slip casting process and the defect detection process of the anti-sliding key are carried out at the same time, internal defects of the anti-sliding key can be found in time, the quality of the obtained anti-sliding key can be evaluated, and an operator can conveniently take corresponding measures in time to improve the compactness of the anti-sliding key.

The invention belongs to the technical field of highway construction, and particularly relates to a while-drilling frequency-adjustable fully-polarized drilling radar detection device and a working method, the device comprises a drill rod body, the drill rod body is a hollow cylinder, and the end part of the drill rod body is connected with a drilling tool through a metal joint; the at least two medium windows are annularly and uniformly distributed on the drill rod body; each dielectric window is internally provided with a radial fully-polarized antenna unit used for annular detection. The radial fully-polarized antenna unit is switched among a plurality of frequency bands through the frequency-adjustable circuit module and realizes impedance matching, and the signal processing and transmission module processes radar signals and uploads data to the ground; the barrel comprises a carbon fiber reinforced composite layer, a wear-resistant layer is arranged on the outer surface of the carbon fiber reinforced composite layer, a glass fiber transition layer is arranged between the area where the dielectric window is located and the inner wall face of the carbon fiber reinforced composite layer, the periphery of the dielectric window is sleeved with an outer lantern ring, and a wave absorbing layer is arranged on the inner wall face of the glass fiber transition layer. The carbon fiber composite material bearing cylinder is used for replacing a metal section, so that the problem of metal shielding is solved.

The invention relates to a borehole radar data high-resolution processing method based on mixed time-frequency analysis, and the method comprises the steps: constructing a discrete frequency based on the scale resolution of borehole radar data; performing Hilbert transform on the drilling radar data to generate an analysis signal; and filtering the signals, performing signal reconstruction, further obtaining weighted energy of different frequency bands, and finally outputting data after high-resolution processing. Dynamic weighting is realized through low-frequency and high-frequency weighting factors, and low-frequency / high-frequency components are flexibly enhanced or suppressed; through envelope normalization, pulse noise is suppressed, and the signal-to-noise ratio is improved; original phase information is reserved during frequency domain filtering through conjugate symmetric filling, signal distortion is avoided, and time positioning precision can be kept in time-frequency analysis; through different frequency band energy weighting processing and high and low frequency joint analysis, simultaneous broadening of high and low frequencies is realized, and high-resolution amplitude preservation processing is realized.

The present disclosure describes a borehole radar system (100) for a drill string (200). The system (100) includes a radar transmitter (102) placed within or adjacent to a housing of a bottom hole assembly (202) of the drill string (200). The radar transmitter (102) includes a transmit antenna (104) for coupling electromagnetic waves to the drill string (200) to propagate in a forward direction along an axis of the drill string (200) in one or more predefined modes including TEM, TE 11 and / or higher order modes. A radar receiver (106) is placed within or adjacent to the housing of the bottom hole assembly (202). The radar receiver (106) includes a receiver antenna (108) adapted to receive electromagnetic waves reflected or scattered from the surrounding medium (302).

The invention relates to a method for identifying a coal seam and a non-coal seam based on borehole radar wavelet energy spectrum analysis, which comprises the following steps of: based on radar detection data of a plurality of boreholes, determining energy of each scale under each depth of each borehole by adopting a wavelet energy spectrum analysis method, and solving an energy weighted accumulated value of each scale under each depth; determining a scale boundary value of a coal seam and a non-coal seam according to the multi-scale wavelet energy spectrums of all the drill holes, and determining an energy weighted accumulation boundary value according to the energy weighted accumulation spectrums of all the drill holes; and finally determining that the lithology of each depth in the to-be-identified drill hole is a coal seam or a non-coal seam. According to the method, wavelet decomposition is carried out on the borehole radar signal by using wavelet energy spectrum analysis, and the lithology of each depth in the borehole can be accurately identified according to the scale boundary value of the coal seam and the non-coal seam and the boundary value of energy weighting accumulation.

The invention discloses a borehole radar detection method and system applied to an underground coal mine, and the method comprises the steps: obtaining the radar data of the underground coal mine through a borehole radar detection device; processing the obtained radar data by using a signal processing algorithm to obtain a radar profile map; processing through a speed pickup algorithm to obtain propagation speed information of the electromagnetic waves in the stratum; performing electromagnetic wave propagation velocity information extraction and algorithm processing on the reflecting surface to obtain the reflecting surface position of the coal seam roof and floor; and processing through a time-depth conversion algorithm to obtain depth information of the underground structure. According to the method, the special environment and safety requirements of the underground coal mine are considered, and the detection efficiency and accuracy are improved through an advanced data processing algorithm and a high-precision measurement technology.