CN114675263A - Underground pipeline material identification method using dual-polarization ground penetrating radar - Google Patents
Underground pipeline material identification method using dual-polarization ground penetrating radar Download PDFInfo
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- CN114675263A CN114675263A CN202210372190.4A CN202210372190A CN114675263A CN 114675263 A CN114675263 A CN 114675263A CN 202210372190 A CN202210372190 A CN 202210372190A CN 114675263 A CN114675263 A CN 114675263A
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- 230000000149 penetrating effect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 43
- 230000010287 polarization Effects 0.000 claims abstract description 20
- 239000011159 matrix material Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/411—Identification of targets based on measurements of radar reflectivity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Radar, Positioning & Navigation (AREA)
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Abstract
The invention discloses an underground pipeline material identification method using a dual-polarized ground penetrating radar, which comprises the following steps: step (1): selecting a dual-polarized ground penetrating radar with proper central frequency, and collecting dual-polarized radar data of the underground pipeline; step (2): due to the fact that unbalance exists between an HH channel and a VV channel of the dual-polarization ground penetrating radar, polarization calibration is conducted on the dual-polarization radar data through metal plate reflection; and (3): calculating a polarized alpha angle of the underground pipeline; and (4): judging the type of the underground pipeline according to the fitted underground medium relative dielectric constant and the calculated polarized alpha angle; the low alpha value of polarization is a plastic pipeline, the high alpha value is a metal pipeline, and the middle alpha value is a concrete pipeline. Calculating a polarization alpha angle reflected by the underground pipeline, and calculating the dielectric constant of the underground soil body by using hyperbolic fitting; and according to the polarization alpha angle and the dielectric constant of the underground soil body of the underground pipeline, the signal characteristics of different types of pipelines are researched.
Description
Technical Field
The invention belongs to the technical field of radar identification, and particularly relates to a method for identifying the material of an underground pipeline by using a dual-polarized ground penetrating radar.
Background
The underground pipe network refers to the laying of urban underground pipelines, and is a pull link for building water supply, power supply, communication, drainage and the like into a similar network. The method is used for building a relatively perfect urban underground pipeline system in China; because it buries deeply underground, so just very difficult when detecting its material, but need excavate ground when city transformation, need an accurate method to survey underground piping and discern its material, reform transform and provide underground pipe network diagram for the city, guarantee going on smoothly of underground transformation.
Disclosure of Invention
The invention aims to provide an underground pipeline material identification method using a dual-polarized ground penetrating radar.
In order to achieve the purpose, the invention provides the following technical scheme: a method for identifying the material of an underground pipeline by using a dual-polarized ground penetrating radar comprises the following steps:
step (1): selecting a dual-polarized ground penetrating radar with proper central frequency, and collecting dual-polarized radar data of the underground pipeline;
step (2): due to the fact that unbalance exists between an HH channel and a VV channel of the dual-polarized ground penetrating radar, polarization calibration is conducted on collected dual-polarized radar data through a metal plate;
and (3): calculating a polarized alpha angle of the underground pipeline;
and (4): estimating the dielectric constant of the medium around the underground pipeline by hyperbolic fitting, and judging the type of the underground pipeline according to the calculated polarized alpha angle; the small value of the alpha angle of polarization is a plastic pipeline, the large value is a metal pipeline, and the middle value is a concrete pipeline.
Preferably, the step (1) specifically comprises the following steps:
the method comprises the following steps that (1.1) under a distance measuring wheel trigger mode, dual-polarized ground penetrating radar is used for collecting dual-polarized radar data in the direction perpendicular to the underground pipeline, and the fact that the reflection shape of an inverse curve of the underground pipeline is intact is guaranteed;
step (1.2) data processing is carried out on the obtained dual-polarization radar data, the signal to noise ratio is improved, and the data processing flow comprises the following steps: removing direct current, removing background, correcting zero time and filtering by band pass.
Preferably, the step (2) specifically comprises the following steps:
step (2.1): keeping a dual-polarization radar facing a metal plate still, and collecting dual-polarization radar data in a time or distance measuring theory trigger mode;
step (2.2): the theoretical scattering matrix S matrix of the metal plate is shown in formula (1):
the reflection amplitudes of HH channel and VV channel of the metal plate are the same in formula (1), and S calculated in the following step is calculated by using formula (1)HHAnd SVVCarrying out calibration;
step (2.3): calculating the energy S of the reflected signal of the metal plateHHAnd SVV. Due to the instability of the maximum positive amplitude or negative amplitude, the reflection intensity of the underground pipeline cannot be accurately reflected, the maximum amplitude is replaced by the envelope integral of the reflection signal of the underground pipeline, and Hilbert transform is performed on the dual-polarization radar data reflected by the metal plate obtained in the step (2.2) after the absolute value is taken:
A(t)＝a(t)+b(t)i (2)；
in the formula (2), A (t) is a dual-polarized radar signal after Hilbert transform, a (t) is instantaneous amplitude, and b (t) is phase;
step (2.4): determining the starting time and the ending time of the metal plate reflection through the dual-polarized reflected signal of the metal plate and the envelope image thereof, wherein the reflected signal intensity of the metal plate is as follows:
a in formula (3)HHAnd AVVEnvelope of reflected signals for HH channel and VV channel, t1Is the starting time of reflection of the metal plate, t2The end time of the reflection of the metal plate;
the polarization scattering correction matrix of the dual-polarization radar is obtained by the formula (3):
preferably, the step (3) specifically comprises the following steps:
step (3.1): calculating and calibrating the dual-polarized reflected energy of the underground pipeline collected in the step (1) according to the method in the step (2.3):
t in formula (5)1And t2Respectively the start time and end time of the reflection of the underground pipeline, AHHAnd AVVPolarising the radar reflected signal, delta, for the Hilbert transformed underground pipelineHHAnd deltaVVFor the correction coefficient calculated in step (2),
and
energy is reflected by an HH channel and a VV channel of the underground pipeline after calibration respectively;
the polarization alpha angle α is calculated as:
compared with the prior art, the invention has the following beneficial effects:
(1) adopting a dual-polarized ground penetrating radar to simultaneously obtain polarized radar data of a VV channel and an HH channel;
(2) extracting a reflection signal of the dual-polarization radar at the vertex position of the hyperbola, and carrying out envelope superposition processing on the signal;
(3) calculating a polarization alpha angle reflected by the underground pipeline, and calculating the dielectric constant of the underground soil body by using hyperbolic fitting;
(4) and according to the polarization alpha angle and the dielectric constant of the underground soil body of the underground pipeline, the signal characteristics of different types of pipelines are researched.
Drawings
FIG. 1 is a schematic view of a dual polarized radar underground pipeline inspection system of the present invention;
FIG. 2 is a schematic diagram of a reflection signal of a metal plate according to the present invention;
fig. 3 is a dual polarized reflected signal of the metal plate of the present invention and an envelope image thereof, and t1 and t2 are determined reflection start and end times of the metal plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-3, the present invention provides a technical solution: a method for identifying the material of an underground pipeline by using a dual-polarized ground penetrating radar comprises the following steps:
step (1): selecting a dual-polarized ground penetrating radar with proper central frequency, and collecting dual-polarized radar data of the underground pipeline;
the step (1) specifically comprises the following steps:
the method comprises the following steps that (1.1) under a range finding wheel triggering mode, dual-polarized radar data are collected in a direction perpendicular to an underground pipeline by using the dual-polarized radar, and the reflection shape of an inverse curve of the underground pipeline is ensured to be intact;
step (1.2) data processing is carried out on the obtained dual-polarization radar data, the signal to noise ratio is improved, and the data processing flow comprises the following steps: removing direct current, removing background, correcting zero time and filtering by band pass.
Step (2): due to the fact that unbalance exists between an HH channel and a VV channel of the dual-polarization ground penetrating radar, polarization calibration is conducted on collected dual-polarization radar data;
the step (2) specifically comprises the following steps:
step (2.1): keeping a dual-polarization radar to face a metal plate immovably, and collecting data of the dual-polarization radar in a time or distance measuring theory trigger mode;
step (2.2): the theoretical scattering matrix S matrix of the metal plate is shown in formula (1):
the reflection amplitudes of HH channel and VV channel of the metal plate are the same in formula (1), and S calculated in the following step is calculated by using formula (1)HHAnd SVVCarrying out calibration;
step (2.3): calculating the energy S of the reflected signal of the metal plateHHAnd SVVAnd (3) because the maximum positive amplitude or the maximum negative amplitude is unstable, the reflection intensity of the underground pipeline cannot be accurately reflected, the maximum amplitude is replaced by the envelope integral of the reflection signal of the underground pipeline, and Hilbert transform is performed on the dual-polarization radar data reflected by the metal plate obtained in the step (2.2) after an absolute value is taken:
A(t)＝a(t)+b(t)i (2)；
in the formula (2), A (t) is a dual-polarized radar signal after Hilbert transform, a (t) is instantaneous amplitude, and b (t) is phase;
step (2.4): determining the starting time and the ending time of the metal plate reflection through the dual-polarized reflection signal of the metal plate and the envelope image thereof, wherein the intensity of the reflection signal of the metal plate is as follows:
a in formula (3)HHAnd AVVEnvelope of reflected signals for HH channel and VV channel, t1Is the reflection start time, t, of the metal plate2The end time of the reflection of the metal plate;
the polarization scattering correction matrix of the dual-polarization radar is obtained by the formula (3):
and (3): calculating a polarized alpha angle of the underground pipeline;
the step (3) specifically comprises the following steps:
step (3.1): calculating and calibrating the dual-polarized reflected energy of the underground pipeline collected in the step (1) according to the method in the step (2.3):
t in formula (5)1And t2Respectively the start time and end time of the reflection of the underground pipeline, AHHAnd AVVPolarising the radar reflection signal, delta, for the Hilbert transformed underground pipelineHHAnd deltaVVFor the correction coefficient calculated in step (2),
and
reflecting energy respectively for an HH channel and a VV channel of the underground pipeline after calibration;
the polarization alpha angle α is calculated as:
and (4): judging the type of the underground pipeline according to the fitted underground medium relative dielectric constant and the calculated polarized alpha angle; the small value of the alpha angle of polarization is a plastic pipeline, the large value is a metal pipeline, and the middle value is a concrete pipeline.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A method for identifying the material of an underground pipeline by using a dual-polarization ground penetrating radar is characterized by comprising the following steps:
step (1): selecting a dual-polarized ground penetrating radar with proper center frequency, and collecting dual-polarized radar data of the underground pipeline;
step (2): due to the fact that unbalance exists between an HH channel and a VV channel of the dual-polarization ground penetrating radar, polarization calibration is conducted on the dual-polarization radar data through metal plate reflection;
and (3): calculating a polarized alpha angle of the underground pipeline;
and (4): judging the type of the underground pipeline according to the fitted underground medium relative dielectric constant and the calculated polarized alpha angle; the small value of the alpha angle of polarization is a plastic pipeline, the large value is a metal pipeline, and the middle value is a concrete pipeline.
2. The method for identifying the material of the underground pipeline by using the dual-polarized ground penetrating radar as claimed in claim 1, wherein the step (1) specifically comprises the following steps:
the method comprises the following steps that (1.1) under a range finding wheel triggering mode, dual-polarized radar data are collected in a direction perpendicular to an underground pipeline by using the dual-polarized radar, and the reflection shape of an inverse curve of the underground pipeline is ensured to be intact;
step (1.2) data processing is carried out on the obtained dual-polarization radar data, the signal to noise ratio is improved, and the data processing flow comprises the following steps: removing direct current, removing background, correcting zero time and filtering by band pass.
3. The method for identifying the material of the underground pipeline by using the dual-polarized ground penetrating radar as claimed in claim 1, wherein the step (2) specifically comprises the following steps:
step (2.1): keeping a dual-polarization radar facing a metal plate still, and collecting dual-polarization radar data in a time or distance measuring theory trigger mode;
step (2.2): the theoretical scattering matrix S matrix of the metal plate is shown in formula (1):
the reflection amplitudes of HH channel and VV channel of the metal plate are the same in formula (1), and S calculated in the following step is calculated by using formula (1)HHAnd SVVCarrying out calibration;
step (2.3): the dual-polarization radar is directly opposite to the metal plate, the reflection signal of the metal plate is collected for polarization calibration, the polarization reflection signal of the metal plate is extracted, and the energy S of the reflection signal of the metal plate is calculatedHHAnd SVVAnd (3) because the maximum positive amplitude or the maximum negative amplitude is unstable, the reflection intensity of the underground pipeline cannot be accurately reflected, the maximum amplitude is replaced by the envelope integral of the reflection signal of the underground pipeline, and Hilbert transform is performed on the dual-polarization radar data reflected by the metal plate obtained in the step (2.2) after an absolute value is taken:
A(t)＝a(t)+b(t)i (2)；
in the formula (2), A (t) is a dual-polarized radar signal after Hilbert transform, a (t) is instantaneous amplitude, and b (t) is phase;
step (2.4): determining the starting time and the ending time of the metal plate reflection through the dual-polarized reflection signal of the metal plate and the envelope image thereof, wherein the intensity of the reflection signal of the metal plate is as follows:
a in formula (3)HHAnd AVVEnvelope of reflected signals for HH channel and VV channel, t1Is the starting time of reflection of the metal plate, t2The end time of the reflection of the metal plate;
the polarization scattering correction matrix of the dual-polarization radar is obtained by the formula (3):
4. the method for identifying the material of the underground pipeline by using the dual-polarized ground penetrating radar as claimed in claim 1, wherein the step (3) specifically comprises the following steps:
step (3.1): calculating and calibrating the dual-polarized reflected energy of the underground pipeline collected in the step (1) according to the method in the step (2.3):
t in formula (5)1And t2Respectively the start time and end time of the reflection of the underground pipeline, AHHAnd AVVPolarising the radar reflection signal, delta, for the Hilbert transformed underground pipelineHHAnd deltaVVFor the correction coefficient calculated in step (2),
and
respectively underground pipe after calibrationLines HH and VV reflect energy;
the polarization alpha angle α is calculated as:
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| CN116413719A (en) * | 2023-06-12 | 2023-07-11 | 深圳大学 | Method and related equipment for exploration of lava pipeline below lunar subsurface |
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