Electromagnetic pulse rescue communication system and communication method

Abstract

The invention discloses an electromagnetic pulse rescue communication system which comprises an array type electromagnetic receiver, an array type electromagnetic transmitter and a signal recognizer. The array type electromagnetic receiver is arranged on the ground and is used for collecting and transmitting electromagnetic signals; the array type electromagnetic transmitter is arranged underground and is used for transmitting coded pulse electromagnetic signals; and the signal recognizer is connected with the array type electromagnetic receiver and is used for analyzing the received electromagnetic signals and carrying out three-dimensional positioning on the emission source. The transient electromagnetic technology is adopted, the array type synchronous emission design is combined, the signal penetrability and coverage range are enhanced through the superimposed effect, the signal attenuation rate is low, signals can penetrate through a complex geological structure, and the communication distance is effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the field of transient electromagnetic detection technology, and in particular to an electromagnetic pulse rescue communication system and a communication method. Background Art

[0002] In the event of an emergency caused by a landslide deep underground, existing communication methods such as traditional 4G / 5G, wired, power carrier communications, wifi, Zigbee, drones, and satellite communications have all become ineffective. Currently, there is no suitable emergency communication method to understand the survival status and location of underground personnel, which seriously affects the efficiency of underground rescue. An effective emergency communication technology is urgently needed.

[0003] Although the existing transient electromagnetic detection technology is widely used in mineral exploration, geological monitoring and other fields, its potential in emergency rescue communications has not yet been fully developed. Faced with complex landslide media, traditional transient electromagnetic technology faces systematic failures in penetration ability and positioning accuracy. For example, for concrete-metal mixtures, the penetration depth of electromagnetic waves in conventional frequency bands is attenuated by 60%-80%, while the transmission power that meets the 30-meter penetration requirement is far more than the human safety exposure limit (>10V / m) by 5 orders of magnitude, forming a contradiction of "strong power endangers life, weak signals cannot penetrate". Even if the signal barely penetrates, due to the dual constraints of multipath effects and static inversion algorithm delays, the positioning error is as high as ±3 meters, resulting in a vicious cycle of "signal distortion and false positioning alarms". Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an electromagnetic pulse rescue communication system and a communication method to solve the technical problems in the prior art of insufficient communication penetration, low signal coding and positioning efficiency, and poor anti-interference ability when conducting deep buried rescue communications.

[0005] The present invention provides an electromagnetic pulse rescue communication system, comprising: an array electromagnetic receiver, an array electromagnetic transmitter and a signal identifier;

[0006] The array electromagnetic receiver is set on the ground to collect and transmit electromagnetic signals; the array electromagnetic transmitter is set underground to transmit encoded pulse electromagnetic signals; the signal identifier is connected to the array electromagnetic receiver to analyze the received electromagnetic signals and perform three-dimensional positioning of the transmitting source.

[0007] Furthermore, the array electromagnetic receiver includes: several synchronous receivers; the synchronous receiver includes: a power supply, a receiving signal synchronizer, a coil, a receiver and a communicator; the power supply is used to power the receiver; the coil is used to receive electromagnetic signals; the receiving signal synchronizer is connected to the receiver to generate a synchronization signal for starting reception; the receiver is connected to the coil to convert the analog electromagnetic signal received by the coil into a digital signal; the communicator is used to transmit the digital signal to the signal identifier.

[0008] Furthermore, the array electromagnetic transmitter includes: several synchronous transmitters; the synchronous transmitter includes: a power supply, a time signal controller, a converter and a coil; the power supply is used to supply power to the converter; the time signal controller is used to form a synchronous pulse signal; the converter is used to generate a current or voltage signal of a corresponding frequency according to the synchronous pulse signal; the coil is used to generate an electromagnetic pulse signal according to the current or voltage signal.

[0009] The present invention also provides a communication method of an electromagnetic pulse rescue communication system, comprising:

[0010] Step 1: Set the signal encoding method;

[0011] Step 2: Encode the rescue information according to the signal encoding method;

[0012] Step 3: Several synchronous transmitters transmit electromagnetic pulse signals with coded information according to the synchronous pulse signal of the time signal controller;

[0013] Step 4: The array electromagnetic receiver receives the electromagnetic pulse signal with the coded information and converts the electromagnetic pulse signal into a digital signal;

[0014] Step 5: The signal identifier decodes the digital signal and performs three-dimensional positioning of the transmitting source.

[0015] Furthermore, the encoding method set in step 1 is:

[0016] The code is performed with three signals: "1", "0" and "-1".

[0017] Furthermore, the method of transmitting the electromagnetic pulse signal with coded information in step 3 is:

[0018] When the signal is "0", the current or voltage of the control coil is maintained at the current value within the preset equal time interval;

[0019] When the signal is "1", the current or voltage of the control coil jumps from a positive value to zero, or from zero to a positive value, within a preset equal time interval;

[0020] When the signal is "-1", the current or voltage of the control coil jumps from a negative value to zero, or from zero to a negative value, within a preset equal time interval.

[0021] Furthermore, in step 5, the specific process of the signal identifier decoding the digital signal is as follows:

[0022] Set the zero-level voltage interval. When the voltage value is greater than the voltage interval, it is a high level; when the voltage value is within the voltage interval, it is a zero level; when the voltage value is less than the voltage interval, it is a low level;

[0023] When the zero level is maintained for a preset equal time interval, the received signal is "0";

[0024] When there is a process of zero level jumping to high level and then jumping to zero level within a preset equal time interval, the received signal is "1";

[0025] When there is a process of zero level jumping to low level and then jumping to zero level within a preset equal time interval, the received signal is "-1";

[0026] Organize the coding results and obtain rescue information.

[0027] Furthermore, the specific method of the signal identifier for three-dimensional positioning of the emission source is:

[0028] Starting with the synchronization signal, the first voltage jump received by each synchronization receiver is cut off, and the interval time is taken as the absolute receiving time of the current synchronization receiver;

[0029] The signal arrival time difference is obtained according to the absolute receiving time of each synchronous receiver. Based on the TDOA method and combined with the position coordinates of the synchronous receiver, a group of equations for the three-dimensional coordinates of the signal source is established, and the three-dimensional coordinates of the signal source are obtained by solving the group of equations.

[0030] Furthermore, the equation group for establishing the three-dimensional coordinates of the signal source also includes: introducing a correction parameter for the propagation velocity of the geological medium.

[0031] Furthermore, the method for solving the system of equations includes: least squares method or particle swarm optimization algorithm.

[0032] Beneficial effects of the present invention:

[0033] The present invention adopts transient electromagnetic technology, combined with array-type synchronous transmission design, and enhances signal penetration and coverage through superposition effect. The signal attenuation rate is low, and the signal can penetrate complex geological structures, effectively extending the communication distance. The present invention adopts a three-state coding method, combined with dynamic threshold judgment, with strong noise resistance and low bit error rate. The present invention constructs a set of equations for the three-dimensional coordinates of the signal source through the reception time difference of multiple synchronous receivers, combined with the TDOA method, and introduces the geological medium propagation speed correction parameter at the same time, effectively improving the positioning accuracy and positioning rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0035] Figure 1 is a system block diagram of a specific embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of the encoding and decoding process of a specific embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] The present invention is further illustrated below in conjunction with specific embodiments. Those skilled in the art should understand that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention, and modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of this application.

[0039] like Figure 1 As shown, the present invention provides an electromagnetic pulse rescue communication system, comprising: an array electromagnetic receiver, an array electromagnetic transmitter and a signal identifier;

[0040] The array electromagnetic receiver is set on the ground to collect and transmit electromagnetic signals; the array electromagnetic transmitter is set underground to transmit encoded pulse electromagnetic signals; the signal identifier is connected to the array electromagnetic receiver to analyze the received electromagnetic signals and perform three-dimensional positioning of the transmitting source.

[0041] The array electromagnetic receiver includes: several synchronous receivers; the synchronous receiver includes: a power supply, a receiving signal synchronizer, a coil, a receiver and a communicator;

[0042] The power supply is used to supply power to the receiver; the coil is used to receive electromagnetic signals; the receiving signal synchronizer is connected to the receiver and is used to generate a synchronization signal for starting reception, and the synchronization signal ensures that the timing of the received signals is consistent; the receiver is connected to the coil and is used to convert the analog electromagnetic signal received by the coil into a digital signal; the communicator is used to transmit the digital signal to the signal identifier.

[0043] The array electromagnetic transmitter includes: several synchronous transmitters; the synchronous transmitter includes: a power supply, a time signal controller, a converter and a coil;

[0044] The power supply is used to supply power to the converter; the time signal controller is used to form a synchronization pulse signal. The time signal controllers between the synchronous transmitters simultaneously generate synchronization pulse signals. The synchronization pulse signals are used to keep the transmission time and waveform consistent, thereby ensuring that several synchronous transmitters are synthesized into an equivalent transmission source; the converter is used to generate a current or voltage signal of a corresponding frequency according to the synchronization pulse signal; the coil is used to generate an electromagnetic pulse signal according to the current or voltage signal.

[0045] like Figure 2 As shown, the present invention also provides a communication method of an electromagnetic pulse rescue communication system, comprising:

[0046] Step 1: Set the signal encoding method and encode the three signals as "1", "0" and "-1";

[0047] Step 2: The rescue information can be encoded according to the signal encoding method, such as Figure 2 The information coding in is shown as follows;

[0048] Step 3: Several synchronous transmitters transmit electromagnetic pulse signals with coded information according to the synchronous pulse signal of the time signal controller. The specific transmission method is as follows:

[0049] Take the synchronous pulse signal as the time starting point and arrange the transmission waveform according to the preset equal time interval ΔT.

[0050] When the signal is "0", the current or voltage of the control coil is maintained at the current value within the preset equal time interval ΔT. When the current current or voltage is zero, it remains zero; when the current current or voltage is positive, it remains positive; when the current current or voltage is negative, it remains negative.

[0051] When the signal is "1", the current or voltage of the control coil jumps from a positive value to zero or from zero to a positive value within a preset equal time interval ΔT;

[0052] When the signal is "-1", the current or voltage of the control coil jumps from a negative value to zero or from zero to a negative value within a preset equal time interval ΔT;

[0053] Through the above transmission method, information can be encoded and transmitted as follows Figure 2 The information in the transmission is shown;

[0054] Step 4: The array electromagnetic receiver receives the electromagnetic pulse signal with the coded information and converts the electromagnetic pulse signal into a digital signal;

[0055] Step 5: The signal identifier decodes the digital signal and performs three-dimensional positioning of the transmitting source.

[0056] The specific process of decoding is:

[0057] Set the zero-level voltage interval [-V, V]. When the voltage value is greater than V, it is a high level; when the voltage value is within the voltage interval, it is a zero level; when the voltage value is less than -V, it is a low level;

[0058] When the zero level is maintained within a preset equal time interval ΔT, the received signal is "0";

[0059] When there is a process of a zero level jump to a high level and then to a zero level within a preset equal time interval ΔT, the received signal is "1";

[0060] When there is a process of zero level jumping to low level and then jumping to zero level within the preset equal time interval ΔT, the received signal is "-1";

[0061] Sort out the coding results and obtain rescue information, such as Figure 2 The process of information reception-information extraction-information restoration is shown in FIG.

[0062] The specific method of the signal identifier to perform three-dimensional positioning of the emission source is:

[0063] Each synchronous receiver starts to receive the electromagnetic pulse signal after receiving the synchronization signal. The information received by the synchronous receiver is transmitted to the signal identifier. The signal identifier takes the generation time of the synchronization signal as the starting point and the next rising edge or falling edge of the signal as the end point. The time difference between the two is Ti, which is the absolute receiving time of the current synchronous receiver, and this moment is used as the starting point of the preset equal time interval ΔT.

[0064] The signal arrival time difference is obtained according to the absolute receiving time of each synchronous receiver. Based on the TDOA method and combined with the position coordinates of the synchronous receiver, an equation group of the three-dimensional coordinates of the signal source is established. The geological medium propagation velocity correction parameter is introduced into the equation group, and the three-dimensional coordinates of the signal source are obtained by solving the equation group through the least squares method or particle swarm optimization algorithm.

[0065] In this way, rescuers can obtain rescue information sent by trapped people and the location of the transmitter, which facilitates rescue operations.

[0066] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An electromagnetic pulse rescue communication system, characterized in that: include: Array electromagnetic receiver, array electromagnetic transmitter and signal identifier; The array electromagnetic receiver is set on the ground to collect and transmit electromagnetic signals; the array electromagnetic transmitter is set underground to transmit encoded pulse electromagnetic signals; the signal identifier is connected to the array electromagnetic receiver to analyze the received electromagnetic signals and perform three-dimensional positioning of the transmitting source.

2. The electromagnetic pulse rescue communication system according to claim 1, characterized in that: The array electromagnetic receiver includes: several synchronous receivers; the synchronous receiver includes: a power supply, a receiving signal synchronizer, a coil, a receiver and a communicator; the power supply is used to supply power to the receiver; the coil is used to receive electromagnetic signals; the receiving signal synchronizer is connected to the receiver and is used to generate a synchronization signal for starting reception; the receiver is connected to the coil and is used to convert the analog electromagnetic signal received by the coil into a digital signal; the communicator is used to transmit the digital signal to the signal identifier.

3. The electromagnetic pulse rescue communication system according to claim 2, characterized in that: The array electromagnetic transmitter includes: several synchronous transmitters; the synchronous transmitter includes: a power supply, a time signal controller, a converter and a coil; the power supply is used to supply power to the converter; the time signal controller is used to form a synchronous pulse signal; the converter is used to generate a current or voltage signal of a corresponding frequency according to the synchronous pulse signal; the coil is used to generate an electromagnetic pulse signal according to the current or voltage signal.

4. A communication method of an electromagnetic pulse rescue communication system, applicable to the electromagnetic pulse rescue communication system as claimed in any one of claims 1 to 3, characterized in that: The method comprises the following steps: Step 1: Set the signal encoding method; Step 2: Encode the rescue information according to the signal encoding method; Step 3: Several synchronous transmitters transmit electromagnetic pulse signals with coded information according to the synchronous pulse signal of the time signal controller; Step 4: The array electromagnetic receiver receives the electromagnetic pulse signal with the coded information and converts the electromagnetic pulse signal into a digital signal; Step 5: The signal identifier decodes the digital signal and performs three-dimensional positioning of the transmitting source.

5. The communication method of the electromagnetic pulse rescue communication system according to claim 4, characterized in that: The encoding method set in step 1 is: The encoding is performed using three signals: "1", "0" and "-1".

6. The communication method of the electromagnetic pulse rescue communication system according to claim 5, characterized in that: The method of transmitting the electromagnetic pulse signal with coded information in step 3 is: When the signal is "0", the current or voltage of the control coil is maintained at the current value within the preset equal time interval; When the signal is "1", the current or voltage of the control coil jumps from a positive value to zero, or from zero to a positive value, within a preset equal time interval; When the signal is "-1", the current or voltage of the control coil jumps from a negative value to zero, or from zero to a negative value, within a preset equal time interval.

7. The communication method of the electromagnetic pulse rescue communication system according to claim 5, characterized in that: In step 5, the specific process of the signal identifier decoding the digital signal is as follows: Set the zero-level voltage interval. When the voltage value is greater than the voltage interval, it is a high level; when the voltage value is within the voltage interval, it is a zero level; when the voltage value is less than the voltage interval, it is a low level; When the zero level is maintained for a preset equal time interval, the received signal is "0"; When there is a process of zero level jumping to high level and then jumping to zero level within a preset equal time interval, the receiving signal is "1"; When there is a process of zero level jumping to low level and then jumping to zero level within the preset equal time interval, the received signal is "-1"; Organize the coding results and obtain rescue information.

8. The communication method of the electromagnetic pulse rescue communication system according to claim 4, characterized in that: In step 5, the specific method for the signal identifier to perform three-dimensional positioning of the emission source is: Starting with the synchronization signal, the first voltage jump received by each synchronization receiver is cut off, and the interval time is taken as the absolute receiving time of the current synchronization receiver; The signal arrival time difference is obtained according to the absolute receiving time of each synchronous receiver. Based on the TDOA method and combined with the position coordinates of the synchronous receiver, a group of equations for the three-dimensional coordinates of the signal source is established, and the three-dimensional coordinates of the signal source are obtained by solving the group of equations.

9. The communication method of the electromagnetic pulse rescue communication system according to claim 8, characterized in that: The equation group for establishing the three-dimensional coordinates of the signal source also includes: introducing a correction parameter for the propagation speed of the geological medium.

10. The communication method of the electromagnetic pulse rescue communication system according to claim 8 or 9, characterized in that: The method for solving the equation group includes: least square method or particle swarm optimization algorithm.

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