CN111505634A - High-precision slope deformation monitoring system and method - Google Patents
High-precision slope deformation monitoring system and method Download PDFInfo
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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
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/06—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring the deformation in a solid
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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
- G01S7/35—Details of non-pulse systems
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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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
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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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/354—Extracting wanted echo-signals
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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
- G01S7/418—Theoretical aspects
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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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/356—Receivers involving particularities of FFT processing
Abstract
The invention discloses a high-precision slope deformation monitoring system which solves the problem of high-precision slope deformation monitoring by utilizing an acquisition device and a signal receiving, transmitting and processing device. Arranging a plurality of corner reflectors on the side slope, wherein the corner reflectors can generate corresponding deformation along with the deformation of the side slope; a signal receiving and processing device is arranged on one side of the side slope and transmits frequency modulation continuous wave signals to the acquisition device, the frequency modulation continuous wave signals are reflected by the acquisition device and then acquired by the signal receiving, transmitting and processing device to form intermediate frequency echo signals, and the intermediate frequency echo signals are subjected to imaging processing and side slope deformation extraction through the signal receiving, transmitting and processing device to realize two-dimensional deformation monitoring of the side slope. The slope deformation monitoring system provided by the invention overcomes the defects that the existing ground two-dimensional deformation radar is expensive and is difficult to deploy and apply in batch, and realizes slope deformation monitoring with high precision and low cost by adopting a corner reflector and an imaging processing and deformation extraction method based on a modularized signal receiving, transmitting and processing device.
Description
Technical Field
The invention relates to the technical field of foundation deformation monitoring radars, in particular to a high-precision slope deformation monitoring system and method.
Background
The geological condition of the side slope in China is complex, sudden disasters such as surface cracking, settlement, displacement and the like are often generated under the action of external force, landslide often causes great loss, some disasters even destructive disasters to industrial and agricultural production and life and property of people, and therefore the deformation condition of the side slope needs to be monitored in real time with high precision. The existing main slope deformation monitoring means comprise a total station, a differential GPS, a ground two-dimensional deformation monitoring radar, a space-based GNSS and an InSAR time sequence method: the total station belongs to an optical measurement system, the precision can reach a submillimeter level, and the total station has the main defect of being greatly influenced by weather and environment; the differential GPS adopts a differential dual-frequency carrier phase comparison mode to carry out three-dimensional deformation monitoring, the precision can reach millimeter level, and the main defects are that the layout is complex, the damage is easy to occur along with the collapse of a measured point, the cost of a single point is expensive, and the batch deployment and the application are difficult; the ground deformation two-dimensional measurement radar is represented by a FastGBSAR system of the Holland MetaSensing company, an IBIS system jointly developed by Italian IDS company and Florence university, a GBSAR system developed by Beijing university of rational engineering and the like, the systems adopt a ground track synthetic aperture radar technology and an interference measurement technology to realize two-dimensional target deformation measurement, the precision can reach the sub-millimeter level, and the system has the advantages of high precision, long-distance non-contact, all-weather all-day-time and continuous real-time performance, and has the main defects of large weight, high power consumption and high cost of the whole set of equipment, and increases the difficulty of batch deployment and maneuvering application; the space-based GNSS can only realize high-precision measurement of a single point, the deployment cost is high, and the time resolution of the InSAR time sequence method is low, so that the space-based GNSS is more suitable for wide-area large-time-scale deformation monitoring.
In summary, the existing slope deformation monitoring systems have respective problems, or the existing slope deformation monitoring systems cannot solve the problem of all-weather, all-day-long and high-precision deformation monitoring in the technical field, such as a total station; or are expensive and difficult to deploy and apply in bulk, such as differential GPS and ground deformation two-dimensional measurement radar. A slope high-precision deformation monitoring method and system which are high in precision, low in cost, capable of being deployed in batches and applied flexibly are not available.
Disclosure of Invention
The invention provides a high-precision slope deformation monitoring system and method, which are used for overcoming the defects of high precision, low cost, incapability of realizing batch deployment and maneuvering application and the like in the prior art.
In order to achieve the above object, the present invention provides a high-precision slope deformation monitoring system, including:
the acquisition device is used for acquiring deformation information of the side slope; the acquisition device is arranged on a point to be monitored of the side slope and can generate corresponding deformation along with the deformation of the side slope; the collecting device comprises a plurality of corner reflectors;
the signal transceiving and processing device comprises a signal transceiving module and a signal processing module; the signal transceiver module is used for transmitting frequency-modulated continuous wave signals to the corner reflector and demodulating and receiving radio-frequency echo signals generated by the corner reflector; the signal processing module is used for carrying out imaging processing and slope deformation extraction on the signals demodulated and received by the signal transceiving module;
the signal receiving, transmitting and processing device is arranged on one side of the side slope, and the wave beams of the signal receiving, transmitting and processing device cover all corner reflectors on the side slope.
In order to achieve the above object, the present invention further provides a high-precision side slope deformation monitoring method, which uses the high-precision side slope deformation monitoring system for monitoring side slope deformation, and comprises:
collecting deformation information of the side slope by using a collecting device;
acquiring the deformation information through a signal transceiving module in a signal transceiving and processing device, and preprocessing the deformation information;
and (3) utilizing a signal processing module in the signal transceiving and processing device to perform imaging processing and slope deformation extraction on the preprocessed deformation information to obtain a deformation monitoring result of the to-be-monitored point of the slope.
Compared with the prior art, the invention has the beneficial effects that:
the high-precision slope deformation monitoring system provided by the invention solves the problem of high-precision slope deformation monitoring by utilizing the acquisition device and the signal receiving, transmitting and processing device. Arranging a plurality of corner reflectors on the side slope, wherein the corner reflectors can generate corresponding deformation along with the deformation of the side slope; a signal receiving, transmitting and processing device is arranged on one side of the side slope, and the wave beams of the signal receiving, transmitting and processing device can cover all corner reflectors on the side slope so as to ensure that the signal receiving, transmitting and processing device can establish contact with all corner reflectors; the signal receiving and processing device transmits frequency modulation continuous wave signals to the acquisition device, the frequency modulation continuous wave signals are reflected by the acquisition device and then acquired by the signal receiving and processing device to form intermediate frequency echo signals, and the intermediate frequency echo signals are subjected to imaging processing and slope deformation extraction through the signal receiving and processing device to realize monitoring of deformation of each corner reflector, so that two-dimensional deformation monitoring of a slope is realized. The high-precision slope deformation monitoring system overcomes the defects that the conventional ground two-dimensional deformation radar is expensive and difficult to deploy and apply in batch, realizes high-precision and low-cost slope deformation monitoring by adopting a corner reflector and an imaging processing and deformation extraction method based on a modular signal receiving and transmitting and processing device, and can also be popularized and applied to application occasions requiring high-precision real-time deformation monitoring, such as bridges, buildings and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a high-precision slope deformation monitoring system provided by the present invention;
FIG. 2 is a schematic diagram of a high-precision slope deformation monitoring system according to the present invention;
fig. 3 is a pixel diagram corresponding to the actual distance between the corner reflector a and the signal transceiving and processing device in the one-dimensional radar image obtained by the system shown in fig. 2;
FIG. 4 is a graph of actual test line-of-sight distortion results for the system of FIG. 2;
fig. 5 is a graph of actual test differential results for the system shown in fig. 2.
Description of the drawings: 1: a corner reflector; 2: side slope; 3: a signal receiving, transmitting and processing device.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a schematic view of a high-precision slope deformation monitoring system provided by the present invention, in fig. 1, a cement pier seat is installed on one side of a slope 2, a signal transceiver and processing device 3 is fixed on the cement pier seat through a rigid rod, a plurality of settlement connecting rods are installed on the slope 2, and each settlement connecting rod is correspondingly fixed with an angle reflector 1; the wave beam of the signal transceiving and processing device 3 obliquely irradiates all corner reflectors 1 on the slope 2, the frequency modulation continuous wave signal transmitted by the signal transceiving and processing device 3 is reflected by the corner reflectors 1 to obtain a radio frequency echo signal, the radio frequency echo signal is subjected to frequency mixing and low-pass filtering processing by the signal transceiving and processing device 3 to obtain an intermediate frequency echo signal, the intermediate frequency echo signal is subjected to one-dimensional imaging processing by the signal transceiving and processing device 3 to obtain a one-dimensional radar image, the change of the pixel phase of the one-dimensional radar image corresponding to the distance from the corner reflectors 1 to the signal transceiving and processing device 3 along with the time is analyzed, and the deformation of each corner reflector 1 along the direction of the radar sight line is obtained.
The distance between the corner reflector 1 on the side slope 2 and the signal receiving, transmitting and processing device 3 is described as the slant distance, and the slant distance is the distance between two points which are not on the same height.
The invention provides a high-precision slope deformation monitoring system, as shown in fig. 1, comprising:
the acquisition device is used for acquiring deformation information of the side slope 2; the acquisition device is arranged on a point to be monitored of the side slope 2 and can generate corresponding deformation along with the deformation of the side slope; the acquisition device comprises a plurality of corner reflectors 1, the corner reflectors 1 are distributed on a slope 2 in a discrete mode, different slope distances are reserved between the corner reflectors 1 and a signal receiving, transmitting and processing device 3, and the corner reflectors can be separated in a one-dimensional radar image;
the signal transceiving and processing device 3 comprises a signal transceiving module and a signal processing module; the signal transceiver module is used for transmitting frequency-modulated continuous wave signals to the corner reflector 1 and demodulating and receiving radio-frequency echo signals generated by the corner reflector 1; the signal processing module is used for carrying out imaging processing and slope deformation extraction on the signals demodulated and received by the signal transceiving module;
the signal receiving, transmitting and processing device 3 is arranged on one side of the side slope 2, and the wave beam of the signal receiving, transmitting and processing device 3 can cover all corner reflectors 1 on the side slope 2.
The side slope is generally positioned in a local area where landslide is easy to occur, has the characteristics of being local and large in deformation gradient, is easily influenced by irradiation shielding compared with the technical means of monitoring the deformation of the flat ground foundation such as railway lines, areas along the lines and the like, and is more suitable for adopting the radar system and the method for monitoring the deformation of the foundation provided by the invention.
Preferably, the corner reflector 1 is rigidly connected to the point of the side slope 2 to be monitored by means of a settlement connecting rod, so that small deformations of the side slope 2 are transmitted to the corner reflector 1 and the same deformations are produced on the corner reflector 1.
Preferably, the corner reflector 1 is composed of three aluminum plates which are perpendicular to each other, and can provide a strong radar scattering cross section, on one hand, the distance between the corner reflector and the signal receiving, transmitting and processing device corresponds to a certain pixel in a one-dimensional radar image, on the other hand, the signal-to-noise ratio of the one-dimensional radar image can be improved, so that the deformation measurement precision under a long distance condition is guaranteed, meanwhile, the transmitting power of the signal receiving, transmitting and processing device can be reduced, and the complexity and cost of a system are reduced.
In one embodiment of the invention, the corner reflector 1 is composed of three mutually perpendicular triangular aluminum plates, has a simple structure, and can be deployed in batches and applied flexibly.
Preferably, the signal transceiving and processing device 3 is a one-dimensional deformation measurement radar, as shown in fig. 2, and includes a radar transceiving front end (signal transceiving module) and a signal processing module, so as to overcome the defects that the existing ground two-dimensional deformation radar is expensive and is difficult to deploy and apply in batch.
Preferably, the signal transceiver module is configured to transmit a frequency modulated continuous wave signal to the acquisition device and demodulate and receive a radio frequency echo signal generated by the acquisition device, and specifically includes:
the signal transceiver module transmits a frequency-modulated continuous wave signal to the acquisition device, and the frequency-modulated continuous wave signal is reflected by the acquisition device to form a radio frequency echo signal;
and the signal transceiver module receives the radio frequency echo signal and performs frequency mixing and low-pass filtering processing on the received radio frequency echo signal by using the transmitted frequency modulation continuous wave signal to obtain an intermediate frequency echo signal. The frequency of the intermediate frequency echo signal is in direct proportion to the distance from the corner reflector 1 to the signal transceiving and processing device 3.
Preferably, the intermediate frequency echo signal is:
wherein t is time variable, η is emission waveform number, η is 1,2,3, …, N is the number of corner reflectors, A isiEcho amplitude of the ith angle reflector; j is an imaginary symbol; k is a radical ofrIs the frequency modulation, krB/T; b is the bandwidth of the frequency modulated continuous wave signal; t is time width; ri,ηWhen the serial number of the transmitted waveform is η, the distance between the ith corner reflector and the signal receiving, transmitting and processing device is c, the propagation speed of electromagnetic waves is c, and the lambda is the wavelength of a carrier wave;
is a window function.
Preferably, the signal processing module is configured to perform imaging processing and slope deformation extraction on the signal demodulated and received by the signal transceiver module, and specifically includes:
the signal processing module carries out windowing Fourier transform processing on the intermediate frequency echo signal to obtain a one-dimensional radar image;
extracting one-dimensional radar image pixels at the actual distance between each corner reflector and the signal transceiving and processing device from the one-dimensional radar image according to the actual distance between the corner reflector and the signal transceiving and processing device;
and extracting slope deformation according to the pixels to obtain a slope deformation monitoring result.
Preferably, the intermediate frequency echo signal is subjected to windowing fourier transform processing to obtain a one-dimensional radar image:
wherein f is frequency domain variable corresponding to time t, η is transmitted waveform sequence number, N is number of corner reflectors, AiEcho amplitude of the ith angle reflector; t is time width;
is a sinc (x) function; k is a radical ofrIs the frequency modulation, krB/T; b is the bandwidth of the frequency modulated continuous wave signal; ri,ηWhen the serial number of the transmitted waveform is η, the distance between the ith corner reflector and the signal receiving, transmitting and processing device is c, the propagation speed of the electromagnetic wave is c;j is an imaginary symbol; λ is the carrier wavelength;
generally, Hamming (Hamming) windows are selected in windowed Fourier transform processing, and the influence of side lobes of one-dimensional radar images of certain corner reflectors 1 on one-dimensional radar images of other corner reflectors 1 can be obviously reduced.
Preferably, the side slope deformation amount extraction is performed according to the pixels to obtain a side slope deformation monitoring result, and the side slope deformation monitoring result comprises the following steps:
extracting the measuring phase of the corresponding corner reflector changing along with the emitting waveform sequence number η according to the pixel
Wherein η is the serial number of the transmitted waveform, i is the ith angle reflector, lambda is the carrier wave length, Ri,ηWhen the serial number of the transmitting waveform is η, the distance between the ith corner reflector and the signal receiving and transmitting and processing device is short;
in order to compensate inevitable system errors (such as electromagnetic wave propagation) in the deformation monitoring process, the corner reflector 1 without displacement in the beam coverage range of the signal transceiving and processing device 3 is selected as a reference corner reflector, and the measurement phases of other corner reflectors and the measurement phase of the reference corner reflector are subjected to differential processing to obtain deformation projections of other corner reflectors relative to the reference corner reflector in the viewing direction of the signal transceiving and processing device, namely slope deformation monitoring results:
in the formula phii,ηIs a deformation projection; Δ Ri,ηDifferential processing is carried out; λ is the carrier wavelength; ri,ηIth corner reflector distance when ordering η for transmitting waveformDistance between the signal receiving and transmitting device and the processing device; rref,ηThe distance between the reference corner reflector and the signal receiving, transmitting and processing device is obtained; unwarp (phi)i,η) A 2 pi wrap process for the deformed projection.
Preferably, the signal transceiving and processing device further comprises a communication interface for transmitting the slope deformation monitoring result to the data monitoring center in real time.
Fig. 2 is a specific schematic diagram of the high-precision slope deformation monitoring system provided by the present invention, in which a one-dimensional deformation measurement radar (signal transceiver and processing device 3) is provided on the left, a 12V battery is used for supplying power, a frequency modulated continuous wave signal is transmitted through a transmitting antenna, a radio frequency echo signal of a corner reflector is received through a receiving antenna, and a deformation amount is obtained through data analysis (signal processing module); and the right side is a side slope, and a corner reflector A, a corner reflector B and a corner reflector C are arranged, wherein the corner reflectors B and C are used as monitoring points, and the corner reflector A is used as a reference point.
Fig. 3 is a pixel diagram corresponding to the actual distance between the corner reflector a and the signal transceiving and processing device in the one-dimensional radar image obtained by the system shown in fig. 2, and it can be known from the pixel diagram that the signal intensity of the monitoring point is enhanced by the corner reflector, the side lobe is ensured to be lower than 30dB (actually tested to be-30.84 dB) by the windowed fourier transform processing, the resolution of-3 dB in the tested one-dimensional range profile is 0.20625m, and the smaller main lobe ensures that the influence of clutter interference is smaller.
Fig. 4 is a diagram of a result of a distortion of an actual test sight line of the system shown in fig. 2, in which the abscissa is time (in units of s), the ordinate is distortion (in units of mm), the dotted line represents a change of the distortion of the monitoring point (corner reflector B) with time, the solid line represents a change of the distortion of the monitoring point (corner reflector a) with time of the reference point, it can be seen that within a time period of 150s, the maximum distortion introduced by non-ideal factors such as electromagnetic wave propagation can reach about-0.5 mm, and the monitoring point and the reference point experience similar deformation change trends.
Fig. 5 is a diagram of an actual test difference result of the system shown in fig. 2, the difference result reflects the slope deformation monitoring accuracy, the standard deviation of the error is 0.06473mm, and the submillimeter-level deformation monitoring is realized.
The invention also provides a high-precision side slope deformation monitoring method, which adopts the high-precision side slope deformation monitoring system to monitor the side slope deformation and comprises the following steps:
collecting deformation information of the side slope by using a collecting device;
acquiring the deformation information through a signal transceiving module in a signal transceiving and processing device, and preprocessing the deformation information;
and (3) utilizing a signal processing module in the signal transceiving and processing device to perform imaging processing and slope deformation extraction on the preprocessed deformation information to obtain a deformation monitoring result of the to-be-monitored point of the slope.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a high accuracy side slope deformation monitoring system which characterized in that includes:
the acquisition device is used for acquiring deformation information of the side slope; the acquisition device is arranged on a point to be monitored of the side slope and can generate corresponding deformation along with the deformation of the side slope; the collecting device comprises a plurality of corner reflectors;
the signal transceiving and processing device comprises a signal transceiving module and a signal processing module; the signal transceiver module is used for transmitting frequency-modulated continuous wave signals to the corner reflector and demodulating and receiving radio-frequency echo signals generated by the corner reflector; the signal processing module is used for carrying out imaging processing and slope deformation extraction on the signals demodulated and received by the signal transceiving module;
the signal receiving, transmitting and processing device is arranged on one side of the side slope, and the wave beams of the signal receiving, transmitting and processing device cover all corner reflectors on the side slope.
2. The high-precision slope deformation monitoring system according to claim 1, wherein the corner reflector is rigidly connected with a point of the slope to be monitored through a settlement connecting rod.
3. The high accuracy slope deformation monitoring system of claim 2 wherein the corner reflector is comprised of three mutually perpendicular aluminum plates.
4. The system according to claim 1, wherein the signal transceiver module is configured to transmit a frequency-modulated continuous wave signal to the acquisition device and demodulate and receive a radio-frequency echo signal generated by the acquisition device, and specifically:
the signal transceiver module transmits a frequency-modulated continuous wave signal to the acquisition device, and the frequency-modulated continuous wave signal is reflected by the acquisition device to form a radio frequency echo signal;
and the signal transceiver module receives the radio frequency echo signal and performs frequency mixing and low-pass filtering processing on the received radio frequency echo signal by using the transmitted frequency modulation continuous wave signal to obtain an intermediate frequency echo signal.
5. The high-precision slope deformation monitoring system according to claim 4, wherein the intermediate frequency echo signal is:
wherein t is time variable, η is emission waveform number, η is 1,2,3, …, N is the number of corner reflectors, A isiEcho amplitude of the ith angle reflector; j is an imaginary symbol; k is a radical ofrIs the frequency modulation, krB/T; b is the bandwidth of the frequency modulated continuous wave signal; t is time width; ri,ηWhen the serial number of the transmitted waveform is η, the distance between the ith corner reflector and the signal receiving, transmitting and processing device is c, the propagation speed of electromagnetic waves is c, and the lambda is the wavelength of a carrier wave;
is a window function.
6. The system according to claim 4, wherein the signal processing module is configured to perform imaging processing and slope deformation extraction on the signal demodulated and received by the signal transceiver module, and specifically includes:
the signal processing module carries out windowing Fourier transform processing on the intermediate frequency echo signal to obtain a one-dimensional radar image;
extracting one-dimensional radar image pixels at the actual distance between each corner reflector and the signal transceiving and processing device from the one-dimensional radar image according to the actual distance between the corner reflector and the signal transceiving and processing device;
and extracting slope deformation according to the pixels to obtain a slope deformation monitoring result.
7. The system according to claim 6, wherein the windowed fourier transform processing is performed on the intermediate frequency echo signal to obtain a one-dimensional radar image:
wherein f is frequency domain variable corresponding to time t, η is transmitted waveform sequence number, N is number of corner reflectors, AiEcho amplitude of the ith angle reflector; t is time width;
is a sinc (x) function; k is a radical ofrIs the frequency modulation, krB/T; b is the bandwidth of the frequency modulated continuous wave signal; ri,ηWhen the serial number of the transmitted waveform is η, the distance between the ith corner reflector and the signal receiving, transmitting and processing device is c, the propagation speed of the electromagnetic wave, j is an imaginary number sign, and lambda is the wavelength of the carrier wave;
8. the system according to claim 6, wherein the obtaining of the slope deformation monitoring result by performing slope deformation extraction according to the pixels comprises:
extracting the measuring phase of the corresponding corner reflector changing along with the emitting waveform sequence number η according to the pixel
Wherein η is the serial number of the transmitted waveform, i is the ith angle reflector, lambda is the carrier wave length, Ri,ηWhen the serial number of the transmitting waveform is η, the distance between the ith corner reflector and the signal receiving and transmitting and processing device is short;
selecting a corner reflector without displacement in the beam coverage range of the signal transceiving and processing device as a reference corner reflector, and carrying out differential processing on the measurement phases of other corner reflectors and the measurement phase of the reference corner reflector to obtain deformation projection of other corner reflectors relative to the reference corner reflector in the viewing direction of the signal transceiving and processing device, namely a slope deformation monitoring result:
in the formula phii,ηIs a deformation projection; Δ Ri,ηDifferential processing is carried out; λ is the carrier wavelength; ri,ηWhen the serial number of the transmitting waveform is η, the distance between the ith corner reflector and the signal receiving and processing device, Rref,ηThe distance between the reference corner reflector and the signal receiving, transmitting and processing device is obtained; unwarp (phi)i,η) 2 pi wrap for anamorphic projectionAnd (6) winding treatment.
9. The system for monitoring slope deformation with high precision as claimed in claim 1, wherein the signal transceiving and processing device further comprises a communication interface for transmitting the slope deformation monitoring result to a data monitoring center in real time.
10. A high-precision side slope deformation monitoring method is characterized in that the high-precision side slope deformation monitoring system according to any one of claims 1-9 is adopted for monitoring side slope deformation, and the method comprises the following steps:
collecting deformation information of the side slope by using a collecting device;
acquiring the deformation information through a signal transceiving module in a signal transceiving and processing device, and preprocessing the deformation information;
and (3) utilizing a signal processing module in the signal transceiving and processing device to perform imaging processing and slope deformation extraction on the preprocessed deformation information to obtain a deformation monitoring result of the to-be-monitored point of the slope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010353505.1A CN111505634B (en) | 2020-04-29 | 2020-04-29 | High-precision slope deformation monitoring system and method |
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| CN117310635A (en) * | 2023-11-29 | 2023-12-29 | 南京隼眼电子科技有限公司 | Radar compensation method, radar compensation device, radar equipment and storage medium |
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