CN108287370A - One kind being based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods - Google Patents
One kind being based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods Download PDFInfo
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- CN108287370A CN108287370A CN201810067018.1A CN201810067018A CN108287370A CN 108287370 A CN108287370 A CN 108287370A CN 201810067018 A CN201810067018 A CN 201810067018A CN 108287370 A CN108287370 A CN 108287370A
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- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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Abstract
The present invention relates to one kind being based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, includes the following steps：By transmitting antenna and reception antenna respectively in ground penetrating radar system first passage and second channel be connected, the first passage is transmission channel, and the second channel is receiving channel；Co-polarization detects：With fracture strike for 0 ° of direction, transmitting antenna is placed in parallel with reception antenna, with constant offset away from rotating 180 °；Cross polarization detects：With fracture strike for 0 ° of direction, transmitting antenna is disposed vertically with reception antenna, with constant offset away from rotating 180 °.It is characterized as that the crack identification based on Electromagnetic wave provides a kind of completely new method when the shear wave travelling of the shear wave splitting phenomenon detected by co-polarization and cross polarization detection, and crack can accurately be judged according to separating phenomenon or the trend of fracture medium can be equivalent to.
Description
Technical field
The present invention relates to a kind of fracture detection and recognition methods based on Ground Penetrating Radar azimuthal anisotropy, belong to earth object
The technical field of detection method and target identification in reason.
Background technology
Ground Penetrating Radar（Ground Penetrating Radar,GPR）History can trace back to early 20th century earliest, lead to
The distribution that electromagnetic wave carrys out Underground medium is crossed, has the characteristics that lossless, strong antijamming capability, accurate and efficient.Basic principle
It is that broadband short pulse electromagnetic wave is radiated by transmitting antenna to underground, due to different medium physical characteristic（It is normal to refer mainly to dielectric
Number, conductivity and magnetic conductivity）It has differences, when electromagnetic wave passes through each stratum in underground or a certain objective body, if interface both sides are electric
Magnetic wave physical parameter is different, and electromagnetic wave will occur to reflect and be transmitted on interface, and the electromagnetic impulse for being reflected back ground is received
Antenna is received；Receive signal in electromagnetic waveform, electromagnetic field intensity and propagation path by pass through medium electrical property
And the influence of geometric shape, that is, receive the information for including subsurface formations and objective body in signal.Therefore, it is received by analysis
The waveform parameters such as Travel time, amplitude and phase can make a degree of judgement to the character of subsurface formations and objective body.
More typically antenna type has horizontal rod-shaped/plate dipole antenna, bow-tie type day in commercialization ground penetrating radar system at present
Line（Also known as butterfly antenna）And electromagnetic horn can carry out altogether partially according to the relative position between transmitting antenna and reception antenna
Move the detection away from, launch point and common point three kinds of modes altogether.
Polarization is a kind of shared property of electromagnetic wave, according to electric field vector terminal endpoint in wavefront plane at any time
The track of variation can be classified as linear polarization, circular polarisation and elliptic polarization, and the dipole that Ground Penetrating Radar uses is line pole
Change.Traditional ground exploring radar antenna only receives the back wave of polarization direction identical as transmitting antenna, but when electromagnetic wave incident to tool
After the objective body at electromagnetic wave visual angle, reflected polarization of electromagnetic wave will generate different degrees of rotation, this just makes
At the loss of objective body reflective information, in order to obtain polarization information, the direction progress pole for changing ground exploring radar antenna may be used
Change detection, H polarization can be divided into according to the position relationship of polarization direction and line direction（It is parallel with survey line）And V polarization（With survey
Line is vertical）, therefore, transmitting antenna can be combined into tetra- kinds of polarization modes of HH, VV, HV and VH with reception antenna, wherein HH, VV
For co-polarization, HV, VH are cross polarization.
Maxwell equation group is obeyed in the propagation of frequency electromagnetic waves in the medium, is closed according to maxwell equation group, this structure
System, the Helmholtz of electromagnetic field can be obtained using vector multiplication rule（Helmholtz）Equation, by the equation it is found that electricity
Field E and magnetic field H is propagated with wave, and electric field is vertical with the direction of motion of electromagnetic wave with the direction in magnetic field, is a kind of shear wave.
According to the correlation of physical property and direction, medium can be divided into isotropism and anisotropic medium, split（Seam）
The anisotropy of gap induction is just important a kind of anisotropy, and in such direction anisotropy medium, will produce speed
It is anisotropic to spend orientation, i.e., for both not parallel or be not orthogonal to and split（Seam）The electromagnetic wave in gap direction can split into two shear waves, the party
To there is no research in Electromagnetic wave.
Invention content
The present invention carries to solve the problems, such as that radar detection and identification can not be carried out to anisotropy crack in the prior art
Detection and the shear wave point of polarizing are passed through with method for distinguishing, this method is known based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy for one kind
Phenomenon is split to study anisotropic character.
To solve the above-mentioned problems, the technical solution taken is the present invention：One kind is based on Ground Penetrating Radar orientation respectively to different
Property fracture detection and recognition methods, include the following steps：
Step 1 by transmitting antenna and reception antenna respectively in ground penetrating radar system first passage and second channel be connected, institute
It is transmission channel to state first passage, and the second channel is receiving channel；
Step 2 co-polarization detects：With fracture strike for 0 ° of direction, transmitting antenna is placed in parallel with reception antenna, with constant offset
180 ° away from rotation, according to the trend in shear wave splitting phenomenon analysis crack；
Step 3 cross polarization detects：With fracture strike for 0 ° of direction, transmitting antenna is disposed vertically with reception antenna, with fixed inclined
180 ° away from rotation are moved, fracture strike is judged according to rule when travelling.
Further, in the step 2 with constant offset away from rotating clockwise, every 10 ° of detections are primary, to rotating 180 °.
Further, in the step 3 with constant offset away from rotating clockwise, every 10 ° of detections are primary, to rotating 180 °.
Further, VAR profile figure, the VAR profile are made into co-polarization detection and cross polarization detection data
Figure is using azimuth as abscissa, is ordinate when travelling, and variable area filling display is used in combination.
Further, in the co-polarization detection, polarization mode is that HH polarizes or VV polarizes.
Further, in the cross polarization detection, polarization mode is that HV polarizes or VH polarizes.
Advantageous effect caused by the present invention includes：The present invention is by being based on each azimuthal co-polarization of Ground Penetrating Radar and friendship
Fork polarization detection, obtains Ground Penetrating Radar response characteristic of each azimuth crack under co-polarization and cross polarization, has studied electricity
The feature when shear wave of the shear wave splitting phenomenon of magnetic wave, the shear wave splitting phenomenon detected by co-polarization and cross polarization detection is travelled
A kind of completely new method is provided for the crack identification based on Electromagnetic wave, and can accurately be judged according to separating phenomenon
Crack can be equivalent to fracture medium（Such as underground utilities）Trend.
Description of the drawings
Fig. 1 is the present invention based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods co-polarization observation system
Figure.
Fig. 2 is the present invention based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods cross polarization observation system
System figure.
Fig. 3 is transmitting-receiving away from 40cm co-polarization probe response features.
Fig. 4 is transmitting-receiving away from 40cm cross polarization probe response features.
Fig. 5 is transmitting-receiving away from 60cm co-polarization probe response features.
Fig. 6 is transmitting-receiving away from 60cm cross polarization probe response features.
Specific implementation mode
Further details of explanation is done to the present invention with reference to the accompanying drawings and detailed description, it should be appreciated that
Protection scope of the present invention is not restricted by specific implementation.
It is proposed by the present invention to be based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, include mainly co-polarization
The anisotropic character of detection, cross polarization detection and crack-induced identifies three parts, specific as follows：
First passage in ground penetrating radar system is set as emitting by step 1, and second channel is set as receiving, and respectively with transmitting antenna
It is connect with reception antenna；
Step 2, co-polarization detection, i.e., with fracture strike for 0 ° of direction, transmitting antenna is placed in parallel with reception antenna, with a certain solid
It is primary every 10 ° of detections in the direction of the clock to determine offset distance, rotates to 180 °, observes shear wave splitting situation；
Step 3, cross polarization detection, i.e., with fracture strike for 0 ° of direction, transmitting antenna is disposed vertically with reception antenna, with a certain
Constant offset is rotated to 180 °, rule when observation is travelled away from being detected once every 10 ° in the direction of the clock；
It is programmed using MATLAB and reads co-polarization detection and cross polarization detection data, using azimuth as abscissa, travelling
When be ordinate, be used in combination variable area filling display make VAR profile figure；
Ground Penetrating Radar azimuthal anisotropy feature under co-polarization and cross polarization is studied by VAR profile figure.With the presence of crack
When, visible shear wave splitting phenomenon in co-polarization detection sectional view under different offset distances, and with the increase of offset distance, shear wave point
The azimuth coverage split increases, but 90 ° of azimuths do not divide always；Under different offset distances in cross polarization detection sectional view not
See shear wave splitting phenomenon, but-increase-reduces again-trend being further added by, and trip at 90 ° of azimuths in reduction when the travelling of shear wave
Longest when row.
It is specially：
First passage in ground penetrating radar system is set as emitting, second channel is set as receiving, and is mainly in view of high frequency antenna
（100MHz and its more than）Mostly transceiver antenna.
Transmitting antenna is placed in parallel with reception antenna, and HH polarization and VV polarization can optional one.
Transmitting antenna is disposed vertically with reception antenna, and HV polarization and VH polarization can optional one.
Ground Penetrating Radar azimuthal anisotropy feature under co-polarization and cross polarization is studied, co-polarization and cross polarization number are passed through
Shear wave splitting phenomenon and response characteristic according to the study, and then identify the anisotropic character of crack-induced.
The present invention is detected by being based on each azimuthal co-polarization of Ground Penetrating Radar and cross polarization, is obtained each azimuth and is split
The Ground Penetrating Radar response characteristic being sewn under co-polarization and cross polarization has studied the shear wave splitting phenomenon of electromagnetic wave, passes through copolar
The shear wave of the shear wave splitting phenomenon and cross polarization detection of changing detection is characterized as that the crack based on Electromagnetic wave is known when travelling
A kind of completely new method is not provided, and crack can accurately be judged according to separating phenomenon or can be equivalent to fracture medium（Such as
Underground utilities）Trend.
Embodiment 1
Transmitting antenna and reception antenna centre frequency are 400MHz（Antenna type GSSI5103）, first passage is transmitting, the
Two channels are to receive, and offset distance 40cm, co-polarization probe response feature is shown in Fig. 3,40 ° as seen from the figure~60 °, 110 °~
Visible shear wave splitting in 130 ° of azimuth coverages has no shear wave splitting phenomenon at remaining azimuth；Cross polarization probe response is special
Sign is shown in Fig. 4, is showed no shear wave splitting phenomenon at each azimuth as seen from the figure, and when travelling increases again in reduction-increase-reduces again-
The trend added, and at 90 ° of azimuths travel when longest.
Embodiment 2
Transmitting antenna and reception antenna centre frequency are 400MHz（Antenna type GSSI5103）, first passage is transmitting, the
Two channels are to receive, and offset distance 60cm, co-polarization probe response feature is shown in Fig. 5,20 ° as seen from the figure~80 °, 100 °~
Visible shear wave splitting in 160 ° of azimuth coverages has no shear wave splitting phenomenon at remaining azimuth；Cross polarization probe response is special
Sign is shown in Fig. 6, is showed no shear wave splitting phenomenon at each azimuth as seen from the figure, and when travelling increases again in reduction-increase-reduces again-
The trend added, and at 90 ° of azimuths travel when longest.
Conclusion and 2 offset distance 60cm co-polarizations of the embodiment detection that co-polarization detects when offset distance 40cm in embodiment 1 have
Consistent conclusion, but the former occur shear wave splitting azimuth coverage it is small.
The preferred embodiment of the present invention is above are only, the present invention is not limited in the content of embodiment.For in this field
Technical staff for, can have various change and change within the scope of technical scheme of the present invention, made by it is any variation and
Change, within the scope of the present invention.
Claims (6)
1. one kind being based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, it is characterised in that：Include the following steps：
Step 1 by transmitting antenna and reception antenna respectively in ground penetrating radar system first passage and second channel be connected, institute
It is transmission channel to state first passage, and the second channel is receiving channel；
Step 2 co-polarization detects：With fracture strike for 0 ° of direction, transmitting antenna is placed in parallel with reception antenna, with constant offset
180 ° away from rotation, according to the trend in shear wave splitting phenomenon analysis crack；
Step 3 cross polarization detects：With fracture strike for 0 ° of direction, transmitting antenna is disposed vertically with reception antenna, with fixed inclined
180 ° away from rotation are moved, fracture strike is judged according to rule when travelling.
2. according to claim 1 be based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, feature exists
In：With constant offset away from rotating clockwise in the step 2, every 10 ° of detections are primary, until 180 ° of rotation.
3. according to claim 1 be based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, feature exists
In：With constant offset away from rotating clockwise in the step 3, every 10 ° of detections are primary, until 180 ° of rotation.
4. according to claim 1 be based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, feature exists
In：VAR profile figure is made into co-polarization detection and cross polarization detection data, the VAR profile figure is to be with azimuth
Abscissa is ordinate when travelling, and variable area filling display is used in combination.
5. according to claim 1 be based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, feature exists
In：In the co-polarization detection, polarization mode is that HH polarizes or VV polarizes.
6. according to claim 1 be based on the fracture detection of Ground Penetrating Radar azimuthal anisotropy and recognition methods, feature exists
In：In the cross polarization detection, polarization mode is that HV polarizes or VH polarizes.
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| CN111751392A (en) * | 2020-07-30 | 2020-10-09 | 广州大学 | Steel bar corrosion detection method based on dual-polarization ground penetrating radar |
| CN112924962A (en) * | 2021-01-29 | 2021-06-08 | 上海匀羿电磁科技有限公司 | Underground pipeline lateral deviation filtering detection and positioning method |
| CN114578349A (en) * | 2022-05-06 | 2022-06-03 | 山东大学 | Unmanned airborne geological radar system for detecting hidden danger of dam and inspection method |
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| CN112924962A (en) * | 2021-01-29 | 2021-06-08 | 上海匀羿电磁科技有限公司 | Underground pipeline lateral deviation filtering detection and positioning method |
| CN112924962B (en) * | 2021-01-29 | 2023-02-21 | 上海匀羿电磁科技有限公司 | Underground pipeline lateral deviation filtering detection and positioning method |
| CN114578349A (en) * | 2022-05-06 | 2022-06-03 | 山东大学 | Unmanned airborne geological radar system for detecting hidden danger of dam and inspection method |
| US11774579B1 (en) | 2022-05-06 | 2023-10-03 | Shandong University | Unmanned airborne ground penetrating radar system and inspection method for dam hidden danger detection |
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