CN115575904A - System for removing electromagnetic interference noise by ground penetrating radar - Google Patents
System for removing electromagnetic interference noise by ground penetrating radar Download PDFInfo
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- CN115575904A CN115575904A CN202211240797.3A CN202211240797A CN115575904A CN 115575904 A CN115575904 A CN 115575904A CN 202211240797 A CN202211240797 A CN 202211240797A CN 115575904 A CN115575904 A CN 115575904A
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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Abstract
The application provides a system for removing electromagnetic interference noise of ground penetrating radar, including host computer and ground penetrating radar, the host computer includes first wireless transceiver module, intelligent control module, shows storage module and data processing and interface module, and ground penetrating radar includes second wireless transceiver module, time sequence control module, ranging module, data acquisition processing module, pulse generation control module, trigger, radio frequency switching module, transmitter, receiver and receiving and dispatching antenna. This application lets the trigger be connected with the receiver through the radio frequency switching, under the circumstances that the transmitter does not launch the electromagnetic wave, gathers through the receiver and visits ground radar environment electromagnetic signal and the inside electromagnetic interference noise of ground penetrating radar, as the basement noise after the storage, then switches and lets the trigger be connected with the transmitter, sends normal ground penetrating radar signal, and the normal ground penetrating radar signal that the receiver gathered carries out correlation operation with the basement noise, gets rid of the influence of electromagnetic interference noise.
Description
Technical Field
The application relates to the field of ground penetrating radar signal acquisition and processing, in particular to a system for removing electromagnetic interference noise by a ground penetrating radar.
Background
Ground Penetrating Radar (GPR) is a technology for performing rapid nondestructive testing on an underground target by using the characteristic that electromagnetic waves are reflected and scattered when encountering uneven positions of electromagnetic parameters of an underground medium. The ground penetrating radar technology has the characteristics of convenience, rapidness and no damage in nondestructive detection, and is gradually one of important technical means of geophysical detection. The characteristics of the echo received by a ground penetrating radar are determined by the medium on its propagation path. Specifically, the propagation speed and attenuation of the electromagnetic wave emitted by the ground penetrating radar are related to the permittivity and conductivity of the medium on the propagation path. When an interface with non-uniform dielectric properties is encountered, the electromagnetic wave is reflected or scattered, wherein part of the echo is attenuated and received by the receiving antenna. Through analysis of the collected signals, researchers can reconstruct the geometric features of the subsurface target object.
The working principle of the ground penetrating radar is shown in fig. 1, a transmitter T transmits electromagnetic waves generated by a specific excitation source to a subsurface region according to a certain frequency, the center frequency of the transmitter T is related to the detected depth and the required resolution, and the deeper the detected depth, the lower the center frequency. The electromagnetic wave is reflected and refracted at the interface of different media, and is received by the receiver R after being attenuated by the media.
The ground penetrating radar signal receiving system converts the acquired analog signals into digital signals at a signal acquisition end through A/D conversion, and due to the fact that ground reflection, electromagnetic interference, equipment self and other noises exist, external electromagnetic waves, the equipment self electromagnetic interference and the like are acquired simultaneously in the data acquisition process of the ground penetrating radar, and the actual acquired signals are interfered.
Disclosure of Invention
The invention aims to provide a system for removing electromagnetic interference noise of the outside and equipment by a ground penetrating radar, which is mainly applied to the field of high-speed electromagnetic wave signal acquisition and processing such as ground penetrating radar signal acquisition and the like, and solves the problem that the actually acquired signals are interfered because the outside electromagnetic waves and the electromagnetic interference of system contents are simultaneously acquired in the data acquisition process of the ground penetrating radar.
In order to achieve the above purpose, the present application provides the following technical solutions:
a system for removing electromagnetic interference noise of a ground penetrating radar comprises an upper computer and the ground penetrating radar, wherein the upper computer comprises a first wireless transceiving module, an intelligent control module, a display storage module and a data processing and interface module;
the upper computer is connected with a second wireless transceiving module of the ground penetrating radar through a first wireless transceiving module, the first wireless transceiving module is used for sending a self-checking command and working parameters to the ground penetrating radar, and the ground penetrating radar uploads command feedback, working parameter feedback and acquired data to the upper computer through the wireless transceiving module;
the second wireless transceiver module is respectively connected with the time sequence control module and the pulse generation control module, the time sequence control module receives data of the second wireless transceiver module, the time sequence control module sends radar numbers and frame synchronization signals to the data acquisition and processing module, the data acquisition and processing module also uploads radar number feedback information to the time sequence control module, and the time sequence control module controls the pulse generation module to send pulse generation signals according to instructions of an upper computer;
the pulse generation control module receives a time sequence control module instruction, is connected with the trigger and generates a trigger control signal with a certain frequency required by the trigger;
the trigger is connected with the transmitter, and forms a trigger pulse with a steep front edge after shaping according to a pulse trigger control signal given by the pulse generation control module, and then transmits the trigger pulse to the transmitter;
the transmitter is connected with the transmitting antenna, and the transmitter transmits electromagnetic waves to the transmitting antenna after multi-stage amplification according to an excitation signal given by the trigger;
the transmitter transmits radar waves to the underground through the antenna, the transmitted radar waves are reflected on interfaces of different media to form echo signals, and the echo signals are received by the receiving antenna and the receiver and then transmitted to a sampling circuit on the data acquisition processing module for sampling;
the receiver obtains an echo signal input by a receiving antenna, and adjusts the amplitude of the received signal to a range which can be acquired by the data acquisition processing module through the low noise amplifier and the adaptive gain regulator; controlling radio frequency switching according to a trigger signal, receiving a radar echo signal or realizing noise signal receiving under the condition that a system has no transmitting signal or echo signal, wherein the radio frequency switching can be communicated with a receiver and a receiving antenna or the radio frequency switching can be communicated with the trigger and the receiver;
the data acquisition and processing module completes conversion of received signals from analog signals to digital signals, the data acquisition and processing module transmits the digital signals to the time sequence control module, and the time sequence control module transmits the digital signals to the upper computer through the second wireless transceiving module.
Further, the ground penetrating radar further comprises a distance measuring module, and the distance measuring module is connected with the data acquisition processing module and used for calculating the moving distance of the ground penetrating radar.
Furthermore, the data acquisition and processing module adopts an FPGA chip as a core processing chip.
The beneficial effect of this application does:
this application switches through setting up the radio frequency, switch through the radio frequency and let the trigger be connected with the receiver, thereby it is unchangeable to be in extremely short time internal environment electromagnetic noise and equipment self system interference noise, under the circumstances that the electromagnetic wave is not launched to the transmitter, gather through the receiver and visit ground radar environment electromagnetic signal and visit ground radar inside electromagnetic interference noise, regard as the basement noise after the storage, then the radio frequency switches and lets the trigger be connected with the transmitter, send normal visit ground radar signal, the normal visit ground radar signal that the receiver gathered carries out correlation operation with the basement noise, get rid of the influence of electromagnetic interference noise.
Drawings
FIG. 1 is a schematic diagram of the working principle of a ground penetrating radar;
FIG. 2 is a block diagram of the present system for ground penetrating radar to remove EMI noise;
Detailed Description
The terminology used in the description of the embodiments of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the application, as the embodiments of the present application will be described in detail below with reference to the accompanying drawings.
A system for removing electromagnetic interference noise of a ground penetrating radar introduces an air mining mechanism into the ground penetrating radar system, namely, the environmental electromagnetic noise and the self system interference noise of equipment are considered to be unchanged in a very short time, the environmental electromagnetic signal and the internal electromagnetic interference noise of the system are collected under the condition of not emitting electromagnetic waves, the environmental electromagnetic noise and the internal electromagnetic interference noise of the system are stored and then serve as base noise, and the environmental electromagnetic noise and the collected normal ground penetrating radar signal are subjected to relevant operation to remove the influence of the electromagnetic interference noise.
As shown in fig. 2, a system for removing electromagnetic interference noise by a ground penetrating radar comprises an upper computer and the ground penetrating radar, wherein the upper computer comprises a first wireless transceiver module, an intelligent control module, a display storage module and a data processing and interface module, and the ground penetrating radar comprises a second wireless transceiver module, a time sequence control module, a ranging module, a data acquisition and processing module, a pulse generation control module, a trigger, a radio frequency switching module, a transmitter, a receiver and a transceiver antenna;
the upper computer is connected with a second wireless transceiving module of the ground penetrating radar through a first wireless transceiving module, the first wireless transceiving module is used for sending a self-checking command and working parameters to the ground penetrating radar, and the ground penetrating radar uploads command feedback, working parameter feedback and collected data to the upper computer through the wireless transceiving module;
the second wireless transceiving module is respectively connected with the time sequence control module and the pulse generation control module, the time sequence control module receives data of the second wireless transceiving module, the time sequence control module sends radar numbers and frame synchronization signals to the data acquisition and processing module, the data acquisition and processing module also uploads radar number feedback information to the time sequence control module, and the time sequence control module controls the pulse generation module to send pulse generation signals according to instructions of the upper computer;
the pulse generation control module receives the instruction of the time sequence control module, is connected with the trigger and generates a trigger control signal with a certain frequency required by the trigger;
the trigger is connected with the transmitter, and forms a trigger pulse with a steep front edge after shaping according to a pulse trigger control signal given by the pulse generation control module, and then transmits the trigger pulse to the transmitter;
the transmitter is connected with the transmitting antenna, and the transmitter transmits electromagnetic waves to the transmitting antenna after multi-stage amplification according to the excitation signals given by the trigger;
the transmitter transmits radar waves to the underground through the antenna, the transmitted radar waves are reflected on interfaces of different media to form echo signals, and the echo signals are received by the receiving antenna and the receiver and then are transmitted to a sampling circuit on the data acquisition processing module for sampling;
the receiver obtains an echo signal input by a receiving antenna, and adjusts the amplitude of the received signal to a range which can be acquired by a data acquisition processing module through a low noise amplifier and a self-adaptive gain adjuster; controlling radio frequency switching according to a trigger signal, receiving a radar echo signal or realizing noise signal receiving under the condition that a system has no transmitting signal or echo signal, wherein the radio frequency switching can be communicated with a receiver and a receiving antenna or the radio frequency switching can be communicated with the trigger and the receiver;
the data acquisition and processing module completes conversion of the received signals from analog to digital signals, the data acquisition and processing module transmits the digital signals to the time sequence control module, and the time sequence control module transmits the digital signals to the upper computer through the second wireless receiving and transmitting module.
Furthermore, the ground penetrating radar also comprises a distance measuring module, and the distance measuring module is connected with the data acquisition and processing module and used for calculating the running distance of the ground penetrating radar.
Furthermore, the data acquisition and processing module adopts an FPGA chip.
This application switches through setting up the radio frequency, switch through the radio frequency and let the trigger be connected with the receiver, thereby it is unchangeable to be in extremely short time internal environment electromagnetic noise and equipment self system interference noise, under the condition that the electromagnetic wave is not launched to the transmitter, gather through the receiver and visit ground radar environment electromagnetic signal and visit ground radar inside electromagnetic interference noise, regard as the base noise after the storage, then the radio frequency switches and lets the trigger be connected with the transmitter, send normal visit ground radar signal, the normal visit ground radar signal that the receiver gathered carries out correlation operation, get rid of the influence of electromagnetic interference noise.
The operation process is as follows:
and (3) during normal collection:
f(t)＝s(t)+n(t)；
f (t): received signal, s (t): echo signal, n (t): noise signal
Wherein n (t) = n w (t)+n e (t)，n w (t) ambient electromagnetic noise received while collecting actual data, n e (t) is the electrical noise of the device itself;
and under the condition of not transmitting signals, performing empty mining to obtain:
f'(t)＝n'(t)＝n' w (t)+n' e (t)
n' w (t) is the ambient electromagnetic noise, n ', received at the time the actual data was collected' e (t) is the electrical noise of the device itself; considering that the environmental electromagnetic noise and the electrical noise of the equipment per se do not change greatly in a short time (about 3 us), the noise signal obtained by the empty acquisition is subtracted from the normal acquisition signal to achieveFor the purpose of denoising, the final signal s' (t) is:
s'(t)＝f(t)-f'(t)＝s(t)+Δn(t)
where Δ n (t) = n w (t)+n e (t)-n' w (t)-n' e (t)。
In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection through an intermediate medium, a connection between two elements, or an interaction between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
Reference throughout this specification to apparatus or components, in embodiments or to components thereof, may be understood as not necessarily referring to the particular orientation, construction or operation as such. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or described herein. Moreover, the terms "may include" and "have," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: it is also possible to modify the solutions described in the previous embodiments or to substitute some or all of the technical features. And the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (3)
1. A system for removing electromagnetic interference noise by a ground penetrating radar is characterized in that: the ground penetrating radar comprises an upper computer and a ground penetrating radar, wherein the upper computer comprises a first wireless transceiving module, an intelligent control module, a display storage module and a data processing and interface module, and the ground penetrating radar comprises a second wireless transceiving module, a time sequence control module, a ranging module, a data acquisition processing module, a pulse generation control module, a trigger, a radio frequency switching module, a transmitter, a receiver and a transceiving antenna;
the upper computer is connected with a second wireless transceiving module of the ground penetrating radar through a first wireless transceiving module, the first wireless transceiving module is used for sending a self-checking command and working parameters to the ground penetrating radar, and the ground penetrating radar uploads command feedback, working parameter feedback and collected data to the upper computer through the wireless transceiving module;
the second wireless transceiver module is respectively connected with the time sequence control module and the pulse generation control module, the time sequence control module receives data of the second wireless transceiver module, the time sequence control module sends radar numbers and frame synchronization signals to the data acquisition and processing module, the data acquisition and processing module also uploads radar number feedback information to the time sequence control module, and the time sequence control module controls the pulse generation module to send pulse generation signals according to instructions of an upper computer;
the pulse generation control module receives a time sequence control module instruction, is connected with the trigger and generates a trigger control signal with a certain frequency required by the trigger;
the trigger is connected with the transmitter, and forms a trigger pulse with a steep front edge after shaping according to a pulse trigger control signal given by the pulse generation control module, and then transmits the trigger pulse to the transmitter;
the transmitter is connected with the transmitting antenna, and the transmitter transmits electromagnetic waves to the transmitting antenna after multistage amplification according to an excitation signal given by the trigger;
the transmitter transmits radar waves to the underground through the antenna, the transmitted radar waves are reflected on interfaces of different media to form echo signals, and the echo signals are received by the receiving antenna and the receiver and then are transmitted to a sampling circuit on the data acquisition processing module for sampling;
the receiver obtains an echo signal input by a receiving antenna, and adjusts the amplitude of the received signal to a range which can be acquired by the data acquisition processing module through the low-noise amplifier and the self-adaptive gain regulator; controlling radio frequency switching according to a trigger signal, receiving a radar echo signal or realizing noise signal receiving under the condition that a system has no transmitting signal or echo signal, wherein the radio frequency switching can be communicated with a receiver and a receiving antenna or the radio frequency switching can be communicated with the trigger and the receiver;
the data acquisition and processing module completes conversion of the received signals from analog to digital signals, the data acquisition and processing module transmits the digital signals to the time sequence control module, and the time sequence control module transmits the digital signals to the upper computer through the second wireless transceiving module.
2. The system for removing electromagnetic interference noise of ground penetrating radar according to claim 1, wherein: the ground penetrating radar further comprises a ranging module, and the ranging module is connected with the data acquisition processing module and used for calculating the moving distance of the ground penetrating radar.
3. The system for removing electromagnetic interference noise of ground penetrating radar according to claim 1, wherein: the data acquisition processing module adopts an FPGA chip as a core processing chip.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116856920A (en) * | 2023-07-06 | 2023-10-10 | 中国科学院地质与地球物理研究所 | Application method and instrument of azimuth electromagnetic wave resistivity while drilling instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116856920A (en) * | 2023-07-06 | 2023-10-10 | 中国科学院地质与地球物理研究所 | Application method and instrument of azimuth electromagnetic wave resistivity while drilling instrument |
| CN116856920B (en) * | 2023-07-06 | 2024-04-02 | 中国科学院地质与地球物理研究所 | Application method and instrument of azimuth electromagnetic wave resistivity while drilling instrument |
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