CN115333554A - Through-the-earth communication method and device based on distance sensing - Google Patents
Through-the-earth communication method and device based on distance sensing Download PDFInfo
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- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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Abstract
The invention provides a through-the-earth communication method and a communication device based on distance induction, wherein the communication method comprises the steps of obtaining target information for sending and converting the target information into through-the-earth communication signals; configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting through-the-earth communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field; and receiving the through-the-earth communication signal by using a through-the-earth communication signal receiving device, and converting to obtain target information. According to the invention, the communication electric field and the shielding electric field for communication signal transmission are arranged based on the buried electrode, so that the signal transmission efficiency and quality of through-the-earth communication can be improved.
Description
Technical Field
The invention relates to the technical field of through-the-earth communication, in particular to a through-the-earth communication method and a through-the-earth communication device based on distance sensing.
Background
The electrode ground penetrating communication technology is applied to occasions such as mining, tunnel rescue and the like at present. The electrode ground-penetrating communication technology adopts a very low frequency or low frequency band, an electrode is inserted into a soil layer, the soil layer is used as a dielectric medium, a signal sent by an electrode at one end can penetrate through the soil layer to generate induction on the electrode at the other end, and therefore information is transmitted, but because the depth and the direction of a buried electrode are not fixed in the communication process of the electrode ground-penetrating communication technology, the energy attenuation of a transmission signal can be caused, and the problem that the transmission efficiency in the ground-penetrating communication process is improved is needed to be solved.
Disclosure of Invention
The invention provides a through-the-earth communication method and a communication device based on distance induction.
The invention provides a through-the-earth communication method based on distance induction, which comprises the following steps:
s1: acquiring target information for transmission, and converting the target information into a through-the-earth communication signal;
s2: configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting ground penetrating communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field;
s3: and receiving the through-the-earth communication signal by using a through-the-earth communication signal receiving device, and converting to obtain target information.
Further, the voltage between the buried electrodes of the shielded electrode pair remains stable; the carrier frequency of the through-the-earth communication signal is at a very low frequency or a low frequency band.
Further, S1 includes:
s101: the method comprises the steps of utilizing a software programming method to complete coding and spread spectrum modulation of target information and generating spread spectrum modulation information;
s102: after the spread spectrum modulation information is modulated into a broadband pulse waveform by using the singlechip, the broadband pulse waveform is converted into a through-the-earth communication signal by using a pulse forming circuit.
Further, in S101, the spread spectrum modulation is: according to a preset prototype PN code, the prototype PN code is circularly shifted to generate M mutually orthogonal PN codes, and the symbols with the types and the number of M are subjected to spread spectrum one by one.
Further, S2 includes:
s201: acquiring the electromagnetic parameters of the through-the-earth channel according to a preset communication transmission standard;
s202: according to the conductivity value in the through-the-earth channel electromagnetic parameters, calculating to obtain the depth of the through-the-earth soil layer;
s203: and determining a first buried depth of the buried electrode according to the depth.
Further, S2 includes:
s204: acquiring a relation between an electrode impedance value and an electrode buried depth value based on a preset electrode impedance model;
s205: acquiring an electrode impedance value according to a preset communication transmission standard, and calculating to obtain a second buried depth of the buried electrode according to the electrode impedance value;
s206: after the first buried depth and the second buried depth are subjected to weighted summation calculation, an average value is obtained to obtain the buried depth of the buried electrode;
s207: and according to the buried depth of the buried electrode, carrying out buried configuration on the buried electrode.
Further, S3 includes:
s301: capturing the received communication signal by adopting a method of adding a longer synchronous head to obtain a captured signal;
s302: down-sampling the captured signal to obtain a bearer communication signal;
s303: based on a carrier communication signal, acquiring a spread spectrum signal with a chip length of L, carrying out FFT (fast Fourier transform), and multiplying the spread spectrum signal by a frequency domain value of an original PN (pseudo-noise) code to obtain a first transform sequence;
s304: performing IFFT transformation on the first transformation sequence to obtain a sequence with the length of L, and despreading the load-bearing communication signal according to the position of the peak value of the sequence to obtain a despread signal;
s305: and RS decoding the despread signal to obtain target information.
Further, the method also comprises S4, suppressing the communication interference of the through-the-earth communication signal:
s401: intercepting the received through-the-earth communication signals according to preset points to obtain intercepted through-the-earth communication signals;
s402: filtering the intercepted through-the-earth communication signals by a high-order filter by adopting a multiphase filtering technology;
s403: performing FFT calculation on the communication signal after filtering processing to obtain an interference signal frequency higher than a preset threshold;
s404: and (3) performing time domain narrowband interference suppression by using a time domain adaptive notch filter and taking the frequency value of the interference signal as an initial value.
Further, S5, detecting the signal attenuation condition and compensating;
s501: setting a fixed potential difference value between a ground penetrating communication signal receiving end and a transmitting end under the condition of normal attenuation;
s502: measuring a potential difference value generated after a receiving end receives a through-the-earth communication signal, and calculating a first difference value between the potential difference value and a fixed potential difference value;
s503: determining the attenuation compensation amount corresponding to the first difference value according to a preset magnitude comparison table of the attenuation compensation amount and the absolute value of the first difference value;
s504: when the first difference is a positive value, performing increasing operation according to the attenuation compensation amount; and when the first difference value is a negative value, performing reduction operation according to the attenuation compensation amount.
The invention provides a through-the-earth communication device based on distance induction, which comprises:
the through-the-earth communication signal acquisition module is used for acquiring target information to be transmitted and converting the target information into through-the-earth communication signals;
the ground penetrating communication device setting module is used for configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting through-the-earth communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field;
and the through-ground communication signal receiving module is used for receiving the through-ground communication signal by using the through-ground signal receiving device and converting the through-ground communication signal into target information.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram illustrating steps of a through-the-earth communication method based on distance sensing according to the present invention;
fig. 2 is a schematic diagram illustrating a method for receiving a through-the-earth communication signal according to a distance sensing-based through-the-earth communication method of the present invention;
fig. 3 is a schematic structural diagram of a through-the-earth communication device based on distance sensing according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The invention provides a through-the-earth communication method based on distance induction, as shown in figure 1, comprising:
s1: acquiring target information for transmission, and converting the target information into a through-the-earth communication signal;
s2: configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting through-the-earth communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field;
s3: and receiving the through-the-earth communication signal by utilizing a through-the-earth communication signal receiving device, and converting to obtain target information.
The working principle of the technical scheme is as follows: by embedding a plurality of pairs of electrodes, a communication electric field and a shielding electric field for communication signal transmission are constructed, so that normal transmission of through-the-earth communication signals can be ensured; the embodiment acquires target information for transmission and converts the target information into a through-the-earth communication signal; configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting through-the-earth communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field; and receiving the through-the-earth communication signal by utilizing a through-the-earth communication signal receiving device, and converting to obtain target information.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the electrode buried depth is scientifically set based on the distance induction, and the signal transmission efficiency and quality of through-the-earth communication can be improved.
In one embodiment, the voltage between the buried electrodes of the shielded electrode pair remains stable; the carrier frequency of the through-the-earth communication signal is at a very low frequency or a low frequency band.
The working principle of the technical scheme is as follows: the voltage between the buried electrodes of the shielded electrode pair remains stable; the carrier frequency of the through-the-earth communication signal is at a very low frequency or a low frequency band.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the ground voltage of the shielding electrode and the carrier frequency of the through-ground communication signal are set, so that the through-ground communication device can work normally.
In one embodiment, S1 comprises:
s101: the method comprises the steps of utilizing a software programming method to complete coding and spread spectrum modulation of target information and generating spread spectrum modulation information;
s102: after the spread spectrum modulation information is modulated into a broadband pulse waveform by the singlechip, the broadband pulse waveform is converted into a through-the-earth communication signal by a pulse shaping circuit.
The working principle of the technical scheme is as follows: the realizing process of through-the-earth communication is divided into two parts of receiving and transmitting, wherein the two parts are both composed of a hardware part and a software part, and the hardware part structures of a transmitting end and a receiving end are realized by the control of a single chip microcomputer; the method comprises the steps of completing coding and spread spectrum modulation of target information by using a software programming method to generate spread spectrum modulation information; after the spread spectrum modulation information is modulated into a broadband pulse waveform by using the singlechip, the broadband pulse waveform is converted into a through-the-earth communication signal by using a pulse forming circuit.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the target information can be better converted into the through-the-earth communication signal through the software system and the single chip hardware equipment.
In one embodiment, the spread spectrum modulation in S101 is: according to a preset prototype PN code, the prototype PN code is circularly shifted to generate M mutually orthogonal PN codes, and the spread spectrum is carried out on the symbols with the type number of M one by one.
The working principle of the technical scheme is as follows: in order to better realize coding gain, a mode of combining spread spectrum and coding is adopted, and bit error rate performance can be improved according to the increase of M values; the method comprises the following specific steps: according to a preset prototype PN code, the prototype PN code is circularly shifted to generate M mutually orthogonal PN codes, and the symbols with the types and the number of M are subjected to spread spectrum one by one.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the coding gain can be improved and the computational complexity can be reduced by combining the spread spectrum and the coding.
In one embodiment, S2 comprises:
s201: acquiring the electromagnetic parameters of the through-the-earth channel according to a preset communication transmission standard;
s202: according to the conductivity value in the through-the-earth channel electromagnetic parameter, calculating to obtain the depth of the through-the-earth soil layer;
s203: and determining a first buried depth of the buried electrode according to the depth.
The working principle of the technical scheme is as follows: the soil is used as a through-the-earth communication propagation medium, electromagnetic parameters such as conductivity, dielectric constant, magnetic permeability and the like influence and determine the propagation of communication signals in the soil, wherein the conductivity reflects the current conduction capability of soil layers in the soil, the structure becomes tighter and tighter along with the increase of the depth of the soil layers, the humidity is reduced, the conductivity is relatively low, the temperature of corresponding strata rises along with the continuous increase of the depth, and the conductivity begins to rise along with the temperature; according to the change, the depth of the soil layer of the ground penetrating electrode is set; the method specifically comprises the following steps: acquiring the electromagnetic parameters of the through-the-earth channel according to a preset communication transmission standard; according to the conductivity value in the through-the-earth channel electromagnetic parameters, calculating to obtain the depth of the through-the-earth soil layer; and determining a first buried depth of the buried electrode according to the depth.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the depth of the buried electrode is obtained through the conductivity, and effective reference data can be provided.
In one embodiment, S2 comprises:
s204: acquiring a relation between an electrode impedance value and an electrode buried depth value based on a preset electrode impedance model;
s205: acquiring an electrode impedance value according to a preset communication transmission standard, and calculating to obtain a second buried depth of the buried electrode according to the electrode impedance value;
s206: after the first buried depth and the second buried depth are subjected to weighted summation calculation, an average value is obtained to obtain the buried depth of the buried electrode;
s207: and according to the buried depth of the buried electrode, carrying out buried configuration on the buried electrode.
The working principle of the technical scheme is as follows: when the electrode is inserted into the ground, a certain gap is formed between the electrode and the ground, so that a certain capacitance value is generated; the impedance of an electrode is closely related to the salinity, humidity, temperature, conductivity and the like of a medium surrounding the electrode, and the material, length, diameter, shape and the like of the electrode. The impedance can be effectively reduced by increasing the contact area between the electrode and the ground, namely the deeper the electrode is buried in the ground, the smaller the value of the electrode impedance is; according to the theory, the depth of the buried electrode with the composite requirement is also calculated; the method specifically comprises the following steps: acquiring a relation between an electrode impedance value and an electrode buried depth value based on a preset electrode impedance model; acquiring an electrode impedance value according to a preset communication transmission standard, and calculating to obtain a second buried depth of the buried electrode according to the electrode impedance value; after the first buried depth and the second buried depth are subjected to weighted summation calculation, an average value is obtained to obtain the buried depth of the buried electrode; and according to the buried depth of the buried electrode, carrying out buried configuration on the buried electrode.
The beneficial effects of the above technical scheme are: the scheme that this embodiment provided is adopted, through the second buried depth that electrode impedance model calculation obtained to combine first buried depth to calculate comprehensive electrode buried depth, can guarantee to bury the scientific and reasonable of buried depth setting, be favorable to ground penetrating communication signal's high-efficient transmission.
In one embodiment, as shown in fig. 2, S3 comprises:
s301: capturing the received communication signal by adopting a method of adding a longer synchronous head to obtain a captured signal;
s302: down-sampling the captured signal to obtain a bearer communication signal;
s303: based on a carrier communication signal, acquiring a spread spectrum signal with a chip length of L, carrying out FFT (fast Fourier transform), and multiplying the spread spectrum signal by a frequency domain value of an original PN (pseudo-noise) code to obtain a first transform sequence;
s304: performing IFFT transformation on the first transformation sequence to obtain a sequence with the length of L, and despreading the load-bearing communication signal according to the position of the sequence peak value to obtain a despread signal;
s305: and RS decoding the despread signal to obtain target information.
The working principle of the technical scheme is as follows: in this embodiment, a despreading scheme based on a transform domain is adopted, and the specific steps are as follows:
s301: capturing the received communication signal by adopting a method of adding a longer synchronous head to obtain a captured signal;
s302: down-sampling the captured signal to obtain a bearer communication signal;
s303: based on a carrier communication signal, acquiring a spread spectrum signal with a chip length of L, carrying out FFT (fast Fourier transform), and multiplying the spread spectrum signal by a frequency domain value of an original PN (pseudo-noise) code to obtain a first transform sequence;
s304: performing IFFT transformation on the first transformation sequence to obtain a sequence with the length of L, and despreading the load-bearing communication signal according to the position of the peak value of the sequence to obtain a despread signal;
s305: and RS decoding the despread signal to obtain target information.
There are two methods of determining whether a received communication signal is captured: a threshold method and a method of finding a maximum value. The threshold method compares a correlation value with a set threshold every time a correlation value is calculated, if the correlation value is larger than the threshold, the signal is successfully captured and enters signal tracking, and if the correlation value is smaller than the threshold, a bit is slid, namely the phase is changed to calculate the correlation value again. The method for finding the maximum value is to find a maximum value for each period, and if the period of the position of the maximum value appears or is larger than a set threshold value, the maximum value is captured. The false alarm probability of the threshold method is larger than the maximum method, but the false detection probability is smaller than the maximum method. Meanwhile, the maximum method requires longer capture time and occupies more hardware resources; the invention combines a threshold method and a maximum value method to improve a capture algorithm, and the method comprises the following specific steps:
step 1: carrying out multipath parallel receiving on communication signals, respectively carrying out sliding correlation on the communication signals and a local PN code, obtaining a plurality of correlation values in each sampling time interval, subtracting the correlation values of every two paths, then taking an absolute value, comparing the correlation values, keeping the maximum absolute value as a decision quantity, and recording the relative position of the decision quantity;
and 2, step: comparing the decision quantity with a preset first threshold, if the decision quantity is smaller than the first threshold, receiving the communication signal, sliding for one bit, and then repeating the step 1, and if the decision quantity is larger than the first threshold, entering the step 3;
and 3, step 3: step 1 is carried out once every time the received signal slides by one bit, the times of presetting a period value are repeated, the maximum value is found out from the calculated maximum values with the number equal to the number of the period values, the position of the maximum value is stored, in order to reduce the probability of missed detection, all the positions of the received signal which are larger than a second threshold value are stored while the maximum value is found, and the second threshold value is higher than a first threshold value;
and 4, step 4: and (4) the received communication signal continues to slide, whether the position which is different from the maximum position found in the step (3) by one period is larger than a second threshold value or not is judged, and if the position is larger than the second threshold value, the signal is captured to enter the tracking. If the maximum value of the period is not reached, continuing sliding to find the maximum value of the period and temporarily storing the value which is larger than the second threshold value, then comparing the value with the value of the previous period, judging whether the position which is different from the maximum value by one period is larger than the second threshold value, if so, capturing, and if not, continuing to step 3.
Based on the steps, in the process of capturing the communication signals, the calculation of the capturing threshold has a direct relation to the capturing performance;
the above formula is a calculation formula of false alarm probability obtained according to a noise distribution function, wherein P f Is false alarm probability value, s is capture threshold value, beta 2 Is the variance of signal noise, k is the number of independent Gaussian random variables, i is a number lying in the range from s to infinity, s ≦ i<Infinity; when the capture threshold is low, the probability of false alarm of capture is high; when the capture threshold is larger, the capture false alarm probability is reduced, and according to the relation, a proper capture threshold value can be selected.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the decoding of the signal can be effectively realized through the de-spreading based on the transform domain, and the accurate target information is obtained; the communication signals are captured by a capture algorithm improved based on a threshold method and a maximum value method, and a proper capture threshold value can be set under the condition of ensuring the original false alarm probability, so that the capture probability is improved.
In one embodiment, the method further includes S4, suppressing communication interference of the through-the-earth communication signal:
s401: intercepting the received through-the-earth communication signals according to preset points to obtain intercepted through-the-earth communication signals;
s402: filtering the intercepted through-the-earth communication signal by a high-order filter by adopting a multiphase filtering technology;
s403: performing FFT calculation on the communication signal after filtering processing to obtain an interference signal frequency higher than a preset threshold;
s404: and (3) performing time domain narrowband interference suppression by using the frequency value of the interference signal as an initial value by using a time domain adaptive notch filter.
The working principle of the technical scheme is as follows: in the process of through-the-earth communication, various interferences exist, and the receiving voltage of a receiving end has an attenuation relation with the distance, so that the received voltage value is rapidly attenuated along with the increase of the communication distance; because the through-the-earth communication interference is narrow-band interference, an effective method for inhibiting the narrow-band interference is needed, the time domain narrow-band interference inhibition technology can effectively inhibit the interference, but the convergence speed is low, the frequency domain narrow-band interference inhibition technology is simple to implement, a plurality of narrow-band interferences can be inhibited, but the processing time is increased, and the time delay is increased; the invention combines the time domain and frequency domain narrow-band interference suppression algorithm to suppress the signal interference, which specifically comprises the following steps:
s401: intercepting the received through-the-earth communication signals according to preset points to obtain intercepted through-the-earth communication signals;
s402: filtering the intercepted through-the-earth communication signal by a high-order filter by adopting a multiphase filtering technology;
s403: performing FFT calculation on the communication signal after filtering processing to obtain an interference signal frequency higher than a preset threshold;
s404: and (3) performing time domain narrowband interference suppression by using the frequency value of the interference signal as an initial value by using a time domain adaptive notch filter.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the sensitivity of the through-the-earth communication signal receiving end for receiving signals can be improved by suppressing the interference to the through-the-earth communication signals.
In one embodiment, the method further comprises S5, detecting the signal attenuation condition and compensating;
s501: setting a fixed potential difference value between a ground penetrating communication signal receiving end and a ground penetrating communication signal sending end under the condition of normal attenuation;
s502: measuring a potential difference value generated after a receiving end receives a through-the-earth communication signal, and calculating a first difference value between the potential difference value and a fixed potential difference value;
s503: determining the attenuation compensation amount corresponding to the first difference value according to a preset magnitude comparison table of the attenuation compensation amount and the absolute value of the first difference value;
s504: when the first difference is a positive value, performing increasing operation according to the attenuation compensation amount; and when the first difference value is a negative value, performing reduction operation according to the attenuation compensation amount.
The working principle of the technical scheme is as follows: because the attenuation caused in the signal transmission process can affect the quality of communication information transmission, the signal attenuation condition needs to be detected and compensated; the method comprises the following specific steps:
s501: setting a fixed potential difference value between a ground penetrating communication signal receiving end and a transmitting end under the condition of normal attenuation;
s502: measuring a potential difference value generated after a receiving end receives a through-the-earth communication signal, and calculating a first difference value between the potential difference value and a fixed potential difference value;
s503: determining the attenuation compensation amount corresponding to the first difference value according to a preset magnitude comparison table of the attenuation compensation amount and the absolute value of the first difference value;
s504: when the first difference is a positive value, performing increasing operation according to attenuation compensation quantity; and when the first difference value is a negative value, performing reduction operation according to the attenuation compensation amount.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the attenuation of the signal can be effectively compensated by detecting the attenuation condition and compensating, and the quality of signal transmission is ensured.
The invention provides a through-the-earth communication device based on distance induction, as shown in fig. 3, comprising:
the through-the-earth communication signal acquisition module is used for acquiring target information to be transmitted and converting the target information into through-the-earth communication signals;
the ground penetrating communication device setting module is used for configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting through-the-earth communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field;
and the through-ground communication signal receiving module is used for receiving the through-ground communication signal by using the through-ground signal receiving device and converting the through-ground communication signal into target information.
The working principle of the technical scheme is as follows: the transmitting and receiving device of the through-the-earth communication signal is constructed by arranging a through-the-earth communication signal acquisition module, a through-the-earth communication device setting module and a through-the-earth communication signal receiving module; the method specifically comprises the following steps: the through-the-earth communication signal acquisition module is used for acquiring target information to be transmitted and converting the target information into through-the-earth communication signals; the ground penetrating communication device setting module is used for configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting through-the-earth communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field; and the through-ground communication signal receiving module is used for receiving the through-ground communication signal by using the through-ground signal receiving device and converting the through-ground communication signal into target information.
The beneficial effects of the above technical scheme are: by adopting the scheme provided by the embodiment, the communication electric field and the shielding electric field for communication signal transmission are arranged based on the buried electrode, so that the signal transmission efficiency and quality of through-the-earth communication can be improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A through-the-earth communication method based on distance induction is characterized by comprising the following steps:
s1: acquiring target information for transmission, and converting the target information into a through-the-earth communication signal;
s2: configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting ground penetrating communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field;
s3: and receiving the through-the-earth communication signal by using a through-the-earth communication signal receiving device, and converting to obtain target information.
2. The method according to claim 1, wherein S1 comprises: the voltage between the buried electrodes of the shielding electrode pair is kept stable; the carrier frequency of the through-the-earth communication signal is at a very low frequency or a low frequency band.
3. The method according to claim 1, wherein S1 comprises:
s101: the method comprises the steps of utilizing a software programming method to complete coding and spread spectrum modulation of target information and generating spread spectrum modulation information;
s102: after the spread spectrum modulation information is modulated into a broadband pulse waveform by the singlechip, the broadband pulse waveform is converted into a through-the-earth communication signal by a pulse shaping circuit.
4. The method according to claim 3, wherein the spread spectrum modulation in S101 is: according to a preset prototype PN code, the prototype PN code is circularly shifted to generate M mutually orthogonal PN codes, and the symbols with the types and the number of M are subjected to spread spectrum one by one.
5. The method for through-the-earth communication based on distance sensing of claim 1, wherein S2 comprises:
s201: acquiring electromagnetic parameters of a through-the-earth channel according to a preset communication transmission standard;
s202: according to the conductivity value in the through-the-earth channel electromagnetic parameters, calculating to obtain the depth of the through-the-earth soil layer;
s203: and determining a first buried depth of the buried electrode according to the depth.
6. The method according to claim 5, wherein S2 comprises:
s204: acquiring a relation between an electrode impedance value and an electrode buried depth value based on a preset electrode impedance model;
s205: acquiring an electrode impedance value according to a preset communication transmission standard, and calculating to obtain a second buried depth of the buried electrode according to the electrode impedance value;
s206: after the first buried depth and the second buried depth are subjected to weighted summation calculation, an average value is obtained to obtain the buried depth of the buried electrode;
s207: and according to the buried depth of the buried electrode, carrying out buried configuration on the buried electrode.
7. The method according to claim 1, wherein S3 comprises:
s301: capturing the received communication signal by adopting a method of adding a longer synchronous head to obtain a captured signal;
s302: down-sampling the captured signal to obtain a bearer communication signal;
s303: based on a carrier communication signal, acquiring a spread spectrum signal with a chip length of L, carrying out FFT (fast Fourier transform), and multiplying the spread spectrum signal by a frequency domain value of an original PN (pseudo-noise) code to obtain a first transform sequence;
s304: performing IFFT transformation on the first transformation sequence to obtain a sequence with the length of L, and despreading the load-bearing communication signal according to the position of the sequence peak value to obtain a despread signal;
s305: and RS decoding the despread signal to obtain target information.
8. The method for through-the-earth communication based on distance sensing according to claim 1, further comprising S4, suppressing communication interference of through-the-earth communication signals:
s401: intercepting the received through-the-earth communication signals according to preset points to obtain intercepted through-the-earth communication signals;
s402: filtering the intercepted through-the-earth communication signal by a high-order filter by adopting a multiphase filtering technology;
s403: performing FFT calculation on the communication signal after filtering processing to obtain an interference signal frequency higher than a preset threshold;
s404: and (3) performing time domain narrowband interference suppression by using the frequency value of the interference signal as an initial value by using a time domain adaptive notch filter.
9. The through-the-earth communication method based on distance induction according to claim 1, characterized by further comprising S5, detecting signal attenuation and compensating;
s501: setting a fixed potential difference value between a ground penetrating communication signal receiving end and a transmitting end under the condition of normal attenuation;
s502: measuring a potential difference value generated after a receiving end receives a through-the-earth communication signal, and calculating a first difference value between the potential difference value and a fixed potential difference value;
s503: determining the attenuation compensation amount corresponding to the first difference value according to a preset magnitude comparison table of the attenuation compensation amount and the absolute value of the first difference value;
s504: when the first difference is a positive value, performing increasing operation according to the attenuation compensation amount; and when the first difference value is a negative value, performing reduction operation according to the attenuation compensation amount.
10. A through-the-earth communication device based on distance sensing, comprising:
the through-the-earth communication signal acquisition module is used for acquiring target information to be transmitted and converting the target information into through-the-earth communication signals;
the ground penetrating communication device setting module is used for configuring a signal sending electrode pair and a shielding electrode pair based on a plurality of preset pairs of buried electrodes; the signal transmitting electrode pairs form a communication electric field through voltage change between the electrode pairs and are used for transmitting ground penetrating communication signals; the communication electric field bears the through-the-earth communication signal; the shielding electrode pair structure shields an electric field;
and the through-ground communication signal receiving module is used for receiving the through-ground communication signal by using the through-ground signal receiving device and converting the through-ground communication signal into target information.
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