CN112863094B - Railway protective net intrusion alarm system and working method thereof - Google Patents
Railway protective net intrusion alarm system and working method thereof Download PDFInfo
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- CN112863094B CN112863094B CN202110155550.0A CN202110155550A CN112863094B CN 112863094 B CN112863094 B CN 112863094B CN 202110155550 A CN202110155550 A CN 202110155550A CN 112863094 B CN112863094 B CN 112863094B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a railway protection net intrusion alarm system which comprises a sending end and a receiving end, wherein the sending end comprises an MCU module, a sweep frequency signal generator module, an ultrasonic driving module, a first Lora module and a first ultrasonic transducer; the MCU module is respectively and electrically connected with the sweep frequency signal generator module, the ultrasonic drive module and the first Lora module. The invention can solve the technical problems that the traditional protective net can not detect intrusion and can not provide an alarm function; and the existing distributed optical fiber sensor alarm system has the technical problems of too high manufacturing cost, incapability of being compatible with the existing protective net, too complex construction and large engineering quantity.
Description
Technical Field
The invention belongs to the technical field of railway operation safety, and particularly relates to a railway protection net intrusion alarm system and a working method thereof.
Background
Under the rapid development of railway information construction, in order to guarantee the safe operation of railways and the safety of personnel around railways, protective nets are widely distributed around railways, and are usually in a metal net structure or a distributed alarm system consisting of an optical fiber sensor network.
However, the existing railway protective net has some non-negligible technical problems: firstly, the traditional metal protective net is easily damaged by people (for example, by cutting), once the traditional metal protective net is damaged, the protective effect of the protective net disappears, and the railway operation safety and the personal safety of personnel around the railway are greatly threatened; secondly, an alarm system consisting of an optical fiber sensor network is too expensive to counterfeit, can only perform special protection aiming at some special places, and cannot be popularized in a large area; thirdly, most of the conventional metal protective nets are installed around the railway at present, and if a distributed alarm system needs to be replaced, the conventional protective nets need to be dismantled, so that the construction process is too complex, and the engineering quantity is huge.
Disclosure of Invention
In view of the above-identified drawbacks and needs in the art or improvement thereof, the present invention provides a railway protection net intrusion alert system and a method for operating the same. The purpose is as follows: the technical problems that the conventional protective net cannot detect intrusion and cannot provide an alarm function are solved; and the existing distributed optical fiber sensor alarm system has the technical problems of too high manufacturing cost, incapability of being compatible with the existing protective net, too complex construction and large engineering quantity.
In order to achieve the above object, according to one aspect of the present invention, there is provided a railway protection network intrusion alert system, comprising a sending end and a receiving end, wherein the sending end comprises an MCU module, a sweep signal generator module, an ultrasonic drive module, a first Lora module, and a first ultrasonic transducer, the receiving end comprises a digital signal processing module, a communication module, a second Lora module, a storage module, an ultrasonic signal adjusting module, a second ultrasonic transducer, and an analog-to-digital conversion module, and the sending end and the receiving end are in communication connection in a wireless manner; the MCU module is respectively and electrically connected with the sweep frequency signal generator module, the ultrasonic drive module and the first Lora module, and the sweep frequency signal generator module is also electrically connected with the first ultrasonic transducer through the ultrasonic drive module; the digital signal processing module is electrically connected with the communication module, the second Lora module, the storage module and the analog-to-digital conversion module; the second ultrasonic transducer is electrically connected with the analog-to-digital conversion module through the ultrasonic signal adjusting module.
Preferably, the model of the MCU module is STM32F103RCT6; the model of the digital signal processing module is TMS320C203PZ80; the frequency sweep signal generator module adopts a DDS chip AD5930 to synthesize frequency sweep signals; the model of the ultrasonic driving module is Komada KMD-M4; the first Lora module and the second Lora module are completely identical, and E32-433T20DC of Chengdu hundred million company is adopted; the first ultrasonic transducer and the second ultrasonic transducer are completely the same and adopt HS-4PZT-4528 ultrasonic transducers of Taihe company; the communication module is a 4G, 5G or GPRS communication module; the storage module uses an EEPROM chip; the ultrasonic signal adjusting module comprises a preceding-stage amplifying circuit, a band-pass filtering circuit and a subsequent-stage amplifying circuit which are sequentially connected in series; the model of the analog-to-digital conversion module is AD9462BCPZ-125.
In general, the above system contemplated by the present invention can achieve the following advantages compared to the prior art:
1. the invention utilizes the alarm device additionally arranged on the railway protective net to detect the state of the existing protective net, once a person cuts off the protective net, the alarm device can immediately detect and send out an alarm;
2. the invention adds an alarm device, does not need to replace the prior protective net, has low manufacturing cost and can be well compatible with the protective net in any state;
3. the alarm device is designed by adopting a lightweight embedded system, can be quickly installed, is convenient to construct and has small engineering quantity.
According to another aspect of the present invention, there is provided an operating method of the railway protection net intrusion alarm system, including the steps of:
(1) The digital signal processing module autonomously wakes up and controls the second Lora module to send a wake-up data packet to the first Lora module in a point-to-point manner;
(2) The first Lora module wakes up the MCU module after receiving the wake-up data packet from the second Lora module and waits for receiving the data packet from the second Lora module;
(3) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, and sets a counter i =1, wherein the data packet comprises a working frequency F and a sending power P;
(4) The first Lora module transmits the data packet from the second Lora module to the MCU module;
(5) The MCU module analyzes the data packet from the first Lora module to obtain the working frequency F and the sending power P in the data packet, controls the sweep frequency signal generator module to generate a sine signal with the working frequency of F, and controls the ultrasonic drive module to drive the first ultrasonic transducer to send the generated sine signal to the second ultrasonic transducer with the working power P;
(6) The second ultrasonic transducer transmits a sinusoidal signal from the first ultrasonic transducer to the analog-to-digital conversion module through the ultrasonic signal adjusting module;
(7) The digital signal processing module controls the analog-to-digital conversion module to perform single sampling on the sinusoidal signal from the second ultrasonic transducer, and acquires a plurality of digital signals obtained by single sampling;
(8) The digital signal processing module judges whether the amplitude of each of any three continuous digital signals in the plurality of digital signals obtained in the step (7) is equal to the maximum value of the range of the analog-to-digital conversion module, if so, the step (22) is carried out, and if not, the step (9) is carried out;
(9) The digital signal processing module stores the working power P and the working frequency F of the first ultrasonic transducer in the storage module and sets a variable P i ＝P；
(10) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, wherein the data packet comprises changed frequency Fi = F0+ (i-1) b, and changed power P = P0;
(11) The digital signal processing module judges whether i is less than a constant i max If yes, setting i = i +1, returning to the step (4), and otherwise, entering the step (12); wherein i max Is equal to 2/b +1.
(12) Digital signal processing module slave P 1 、P 2 、…、P i To obtain the minimum value P m And the frequency F at this time m And set counter j =1, where m ∈ [1, i ]]；
(13) The digital signal processing module controls the second Lora module to time interval T (30 s of which>T>2 s) in the directionThe first Lora module transmits a data packet including the changed frequency F = F m Changed power P = P m ；
(14) The first Lora module transmits the data packet from the second Lora module to the MCU module;
(15) The MCU module analyzes a data packet from the first Lora module to obtain a changed frequency F and a changed power P in the data packet, controls the sweep frequency signal generator module to generate a sine pulse signal with a working frequency of F, and controls the ultrasonic drive module to drive the first ultrasonic transducer to send the generated sine pulse signal to the second ultrasonic transducer with the working power P;
(16) The second ultrasonic transducer transmits the sinusoidal signal from the first ultrasonic transducer to the analog-to-digital conversion module through the ultrasonic signal adjusting module;
(17) The digital signal processing module controls the analog-to-digital conversion module to sample the sinusoidal signal from the second ultrasonic transducer for the jth time, acquire a plurality of digital signals obtained by the jth time sampling, perform Fourier transform on each digital signal to obtain a 1-to-10 frequency multiplication coefficient in a Fourier transform result, and perform correlation operation on all the coefficients, equal to the 1-to-10 frequency multiplication, of the frequency F in the Fourier transform result obtained by the jth time sampling and the coefficients, equal to the 1-to-10 frequency multiplication, of the frequency F in the Fourier transform result of the digital signal obtained by the jth-1 time sampling to obtain an operation result R;
(18) The digital signal processing module judges whether the correlation operation result R is smaller than a preset threshold value R0, if so, the step (19) is carried out, otherwise, j = j +1 is set, and the step (13) is returned;
(19) The digital signal processing module sets alarm duration time Tc, controls the second Lora module to continuously send the alarm signal in a broadcasting mode, and controls the communication module to continuously send the alarm signal to the background;
(20) The digital signal processing module judges whether the communication module or the second Lora module receives a work ending instruction, if so, the process is ended, otherwise, the step (21) is carried out;
(21) The digital signal processing module judges whether the alarm duration Tc is reached, if so, the step (13) is returned, otherwise, the step (19) is returned;
(22) And the digital signal processing module controls the second Lora module to send a data packet to the first Lora module, wherein the data packet comprises the changed power P = P-a, and the step (4) is returned, wherein a is a preset constant.
Preferably, the initial value F0 of the operating frequency F is equal to 27kHz, the initial value P0 of the transmission power P is equal to 100W; the sampling rate in the step (7) and the sampling rate in the step (17) are both 1MHz, and the sampling time duration is 1ms; the step value b ranges from 0.01kHz to 0.1kHz;
preferably, the pulse duration of the sinusoidal pulse signal in step (15) is 50ms to 500ms; the alarm timer Tc has a value of 5 to 10 minutes, preferably 8 minutes.
Preferably, the value range of the preset threshold R0 is 0.3 to 0.8, preferably 0.5; the predetermined constant a is in the range of 1 watt to 5 watts, preferably 3 watts.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the invention adopts the steps (1) to (3), controls the awakening and the working process of the sending end in a wireless communication mode through the receiving end, simplifies the circuit of the sending end to the utmost extent, simplifies the function to the utmost extent, realizes the low cost of the whole system and reduces the power consumption of the system.
2. According to the invention, as the step (4) and the step (8) are adopted, the working power P of the first ultrasonic transducer is controlled by the receiving end in a wireless communication mode, so that the maximum working power P which is just not distorted at the receiving end is found, the waveform distortion of the receiving end is avoided, and the accuracy of system monitoring is improved.
3. According to the invention, the step (4) and the step (11) are adopted, the working frequency F and the working power P of the first ultrasonic transducer are controlled by the receiving end in a wireless communication mode, the receiving end digital signal processing module monitors the amplitude of the received digital signal, the working frequency P under different frequencies F is obtained, and the minimum value P is obtained, so that the problem of center frequency point deviation of ultrasonic transducers in different batches is solved, the power consumption is reduced, and the monitoring accuracy is improved.
4. According to the invention, as the step (17) is adopted, the multiple digital signals obtained by sampling at the jth time are obtained, fourier transform is firstly carried out, then the coefficients of frequency multiplication from 1 to 10 in the Fourier transform result and the coefficients of frequency multiplication from 1 to 10 in the Fourier transform result of the digital signals obtained by sampling at the jth time are subjected to related operation, the change of the frequency characteristic of the protective net is mainly monitored, and compared with the method of directly carrying out Fourier transform on the multiple digital signals obtained by sampling at the jth time and the digital signals obtained by sampling at the jth-1 time, the accuracy of monitoring can be improved, and the false alarm rate is reduced.
Drawings
Fig. 1 is a schematic view of a railway protection net intrusion alert system of the present invention;
fig. 2 is a flow chart of the working method of the railway protection net intrusion alarm system of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, according to a first aspect of the present invention, there is provided a railway protection network intrusion alert system, including a sending end and a receiving end, where the sending end includes a Microcontroller (MCU) module 1, a sweep frequency signal generator module 2, an ultrasonic drive module 3, a first Lora module 4, and a first ultrasonic transducer 5, and the receiving end includes a digital signal processing module 6, a communication module 7, a second Lora module 8, a storage module 9, an ultrasonic signal adjusting module 10, a second ultrasonic transducer 11, and an analog-to-digital conversion module 12.
The sending end and the receiving end are in communication connection in a wireless mode.
The MCU module 1 is respectively electrically connected with the sweep frequency signal generator module 2, the ultrasonic drive module 3 and the first Lora module 4, and the sweep frequency signal generator module 2 is also electrically connected with the first ultrasonic transducer 5 through the ultrasonic drive module 3.
Specifically, the model of the MCU module 1 is STM32F103RCT6, the sweep signal generator module 2 adopts a DDS chip AD5930 to synthesize sweep signals, the model of the ultrasonic drive module 3 is Komada KMD-M4, the first Lora module 4 and the second Lora module 8 are completely the same, the first Lora module and the second Lora module adopt E32-433T20DC of Doudoubaite company, the first ultrasonic transducer 5 and the second ultrasonic transducer 11 are completely the same, and the first ultrasonic transducer and the second ultrasonic transducer all adopt HS-4PZT-4528 ultrasonic transducers of Taiheuda company.
The digital signal processing module 6 is electrically connected with the communication module 7, the second Lora module 8, the storage module 9 and the analog-to-digital conversion module 12, and the second ultrasonic transducer 11 is electrically connected with the analog-to-digital conversion module 12 through the ultrasonic signal adjusting module 10.
The model number of the digital signal processing module 6 is TMS320C203PZ80.
The communication module 7 uses 4G, 5G or GPRS communication module.
The memory module 9 uses an EEPROM chip.
The ultrasonic signal conditioning module 10 includes a preceding-stage amplification circuit, a band-pass filter circuit, and a succeeding-stage amplification circuit, which are connected in series in this order.
The model of the analog-to-digital conversion module 12 is AD9462BCPZ-125.
As shown in fig. 2, according to a second aspect of the present invention, there is provided a method for operating the railway protection net intrusion alarm system, including the steps of:
(1) The digital signal processing module autonomously wakes up and controls the second Lora module to send a wake-up data packet to the first Lora module in a point-to-point manner;
(2) The first Lora module wakes up the MCU module after receiving the wake-up data packet from the second Lora module and waits for receiving the data packet from the second Lora module;
(3) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, and sets a counter i =1, wherein the data packet comprises an operating frequency F (the initial value of the operating frequency F is equal to F0) and a sending power P (the initial value of the sending power P is equal to P0);
specifically, in this step, the initial frequency F0=27kHz and the initial transmission power P0=100W.
The above steps (1) to (3) have the advantages that the receiving end controls the awakening and work flow of the transmitting end in a wireless communication mode, the circuit and the function of the transmitting end are simplified to the utmost extent, so that the low cost of the whole system is realized, and the power consumption of the system can be reduced.
(4) The first Lora module transmits the data packet from the second Lora module to the MCU module;
(5) The MCU module analyzes the data packet from the first Lora module to obtain the working frequency F and the sending power P in the data packet, controls the sweep frequency signal generator module to generate a sinusoidal signal with the working frequency of F, and controls the ultrasonic drive module to drive the first ultrasonic transducer to send the generated sinusoidal signal to the second ultrasonic transducer with the working power P;
(6) The second ultrasonic transducer transmits a sinusoidal signal from the first ultrasonic transducer to the analog-to-digital conversion module through the ultrasonic signal adjusting module;
(7) The digital signal processing module controls the analog-to-digital conversion module to perform single sampling on the sinusoidal signal from the second ultrasonic transducer, and acquires a plurality of digital signals obtained by single sampling;
specifically, the sampling rate in this step is 1MHz, and the sampling duration is 1ms, so that the number of digital signals obtained in each sampling process is 1000.
(8) The digital signal processing module judges whether the amplitude of each of any three continuous digital signals in the plurality of digital signals obtained in the step (7) is equal to the maximum value of the range of the analog-to-digital conversion module, if so, the step (22) is carried out, and if not, the step (9) is carried out;
the steps (4) to (8) have the advantages that the working power P of the first ultrasonic transducer is controlled by the receiving terminal in a wireless communication mode, so that the maximum working power P which is just not distorted at the receiving terminal is found, the waveform distortion of the receiving terminal is avoided, and the accuracy of system monitoring is improved.
(9) The digital signal processing module stores the working power P and the working frequency F of the first ultrasonic transducer in the storage module and sets a variable P i ＝P；
(10) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, wherein the data packet comprises changed frequency Fi = F0+ (i-1) b, and changed power P = P0; wherein the step value b ranges from 0.01kHz to 0.1kHz;
(11) The digital signal processing module judges whether i is smaller than a constant imax, if so, i = i +1 is set, the step (4) is returned, and if not, the step (12) is carried out;
specifically, imax is equal to 2/b + 1.
The steps (4) to (11) have the advantages that the working frequency F and the working power P of the first ultrasonic transducer are controlled by the receiving end in a wireless communication mode, the receiving end digital signal processing module monitors the amplitude of the received digital signal, the working frequency P under different frequencies F is obtained, and the minimum value P is obtained, so that the problem of central frequency point deviation of ultrasonic transducers in different batches is solved, the power consumption is reduced, and the monitoring accuracy is improved.
(12) Digital signal processing module slave P 1 、P 2 、…、P i To obtain the minimum value P m And the frequency F at that time m And setting a counter j =1, where m ∈ [1, i ]]；
(13) The digital signal processing module controls the second Lora module to time interval T (30 s of which>T>2 s) to the first Lora module, the data packet including the changed frequency F = F m Changed power P = P m ；
(14) The first Lora module transmits the data packet from the second Lora module to the MCU module;
(15) The MCU module analyzes a data packet from the first Lora module to obtain changed frequency F and changed power P in the data packet, controls the sweep frequency signal generator module to generate a sine pulse signal with working frequency F (pulse duration is 50 ms-500 ms), and controls the ultrasonic driving module to drive the first ultrasonic transducer to send the generated sine pulse signal to the second ultrasonic transducer with working power P;
(16) The second ultrasonic transducer transmits the sinusoidal signal from the first ultrasonic transducer to the analog-to-digital conversion module through the ultrasonic signal adjusting module;
(17) The digital signal processing module controls the analog-to-digital conversion module to sample a sinusoidal signal from a second ultrasonic transducer for the jth time, a plurality of digital signals obtained by the jth sampling are obtained, fourier transform is performed on each digital signal to obtain a coefficient of frequency multiplication from 1 to 10 in a Fourier transform result, and correlation operation is performed on all coefficients of frequency multiplication from 1 to 10, which are equal to frequency F, of the Fourier transform result obtained by the jth sampling and the coefficients of frequency multiplication from 1 to 10, which are equal to frequency F, of the Fourier transform result obtained by the j-1 sampling to obtain an operation result R;
specifically, the sampling rate in this step is 1MHz, and the sampling duration is 1ms, so that the number of digital signals obtained in each sampling process is 1000.
The step (17) has the advantages that the multiple digital signals obtained by sampling at the j-th time are obtained, fourier transform is firstly carried out, then the 1-to-10 frequency multiplication coefficient in the Fourier transform result and the 1-to-10 frequency multiplication coefficient in the Fourier transform result of the digital signals obtained by sampling at the j-1 th time are subjected to related operation, the change of the frequency characteristic of the protective net is mainly monitored, and compared with the method of directly carrying out Fourier transform on the multiple digital signals obtained by sampling at the j-th time and the digital signals obtained by sampling at the j-1 th time, the accuracy of monitoring can be improved, and the false alarm rate is reduced.
(18) The digital signal processing module judges whether the correlation operation result R is smaller than a preset threshold value R0, if so, the step (19) is carried out, otherwise, j = j +1 is set, and the step (13) is returned;
specifically, the value of the preset threshold R0 ranges from 0.3 to 0.8, and is preferably 0.5.
(19) The digital signal processing module sets alarm duration time Tc, controls the second Lora module to continuously send the alarm signal in a broadcasting mode, and controls the communication module to continuously send the alarm signal to the background;
in particular, the alarm timer Tc takes a value of 5 to 10 minutes, preferably 8 minutes.
The channel for sending the alarm signal in the broadcast mode in the step is different from the channels used in all the steps.
(20) The digital signal processing module judges whether the communication module or the second Lora module receives a work ending instruction, if so, the process is ended, otherwise, the step (21) is carried out;
(21) The digital signal processing module judges whether the alarm duration Tc is reached, if so, the step (13) is returned, otherwise, the step (19) is returned;
(22) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, wherein the data packet comprises changed power P = P-a, and the step (4) is returned;
wherein a ranges from 1 watt to 5 watts, preferably 3 watts.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a railway protection network intrusion alert system's working method, railway protection network intrusion alert system includes transmitting terminal and receiving terminal, wherein the transmitting terminal includes the MCU module, frequency sweep signal generator module, ultrasonic drive module, first Lora module, and first ultrasonic transducer, the receiving terminal includes digital signal processing module, communication module, second Lora module, storage module, ultrasonic signal adjusting module, second ultrasonic transducer, and analog-to-digital conversion module, transmitting terminal and receiving terminal pass through wireless mode communication connection, the MCU module respectively with frequency sweep signal generator module, ultrasonic drive module, and first Lora module electricity is connected, frequency sweep signal generator module still is connected with first ultrasonic transducer electricity through ultrasonic drive module, digital signal processing module and communication module, second Lora module, storage module, and analog-to-digital conversion module electricity are connected, second ultrasonic transducer passes through ultrasonic signal adjusting module and analog-to-digital conversion module electricity is connected, a serial communication port, working method includes following step:
(1) The digital signal processing module autonomously wakes up and controls the second Lora module to send a wake-up data packet to the first Lora module in a point-to-point manner;
(2) The first Lora module wakes up the MCU module after receiving the wake-up data packet from the second Lora module and waits for receiving the data packet from the second Lora module;
(3) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, and sets a counter i =1, wherein the data packet comprises a working frequency F and a sending power P;
(4) The first Lora module transmits the data packet from the second Lora module to the MCU module;
(5) The MCU module analyzes the data packet from the first Lora module to obtain the working frequency F and the sending power P in the data packet, controls the sweep frequency signal generator module to generate a sinusoidal signal with the working frequency of F, and controls the ultrasonic drive module to drive the first ultrasonic transducer to send the generated sinusoidal signal to the second ultrasonic transducer with the working power P;
(6) The second ultrasonic transducer transmits the sinusoidal signal from the first ultrasonic transducer to the analog-to-digital conversion module through the ultrasonic signal adjusting module;
(7) The digital signal processing module controls the analog-to-digital conversion module to perform single sampling on the sinusoidal signal from the second ultrasonic transducer, and acquires a plurality of digital signals obtained by single sampling;
(8) The digital signal processing module judges whether the amplitude of each of any three continuous digital signals in the plurality of digital signals obtained in the step (7) is equal to the maximum value of the range of the analog-to-digital conversion module, if so, the step (22) is carried out, and if not, the step (9) is carried out;
(9) The digital signal processing module converts the first super-signal into the second super-signalThe working power P and working frequency F of the acoustic wave transducer are stored in a memory module, and a variable P is set i ＝P；
(10) The digital signal processing module controls the second Lora module to send a data packet to the first Lora module, wherein the data packet comprises changed frequency Fi = F0+ (i-1) b, and changed power P = P0;
(11) The digital signal processing module judges whether i is less than a constant i max If yes, setting i = i +1, returning to the step (4), and otherwise, entering the step (12); wherein i max Is equal to 2/b +1;
(12) Digital signal processing module slave P 1 、P 2 、…、P i To obtain the minimum value P m And the frequency F at this time m And setting a counter j =1, where m ∈ [1, i ]]；
(13) The digital signal processing module controls the second Lora module to time interval T (30 s of which>T>2 s) to the first Lora module, the data packet including the changed frequency F = F m Changed power P = P m ；
(14) The first Lora module transmits the data packet from the second Lora module to the MCU module;
(15) The MCU module analyzes a data packet from the first Lora module to obtain changed frequency F and changed power P in the data packet, controls the sweep frequency signal generator module to generate a sine pulse signal with working frequency F, and controls the ultrasonic drive module to drive the first ultrasonic transducer to send the generated sine pulse signal to the second ultrasonic transducer with the working power P;
(16) The second ultrasonic transducer transmits a sinusoidal signal from the first ultrasonic transducer to the analog-to-digital conversion module through the ultrasonic signal adjusting module;
(17) The digital signal processing module controls the analog-to-digital conversion module to sample a sinusoidal signal from a second ultrasonic transducer for the jth time, a plurality of digital signals obtained by the jth sampling are obtained, fourier transform is performed on each digital signal to obtain a coefficient of frequency multiplication from 1 to 10 in a Fourier transform result, and correlation operation is performed on all coefficients of frequency multiplication from 1 to 10, which are equal to frequency F, of the Fourier transform result obtained by the jth sampling and the coefficients of frequency multiplication from 1 to 10, which are equal to frequency F, of the Fourier transform result obtained by the j-1 sampling to obtain an operation result R;
(18) The digital signal processing module judges whether the correlation operation result R is smaller than a preset threshold value R0, if so, the step (19) is carried out, otherwise, j = j +1 is set, and the step (13) is returned;
(19) The digital signal processing module sets alarm duration time Tc, controls the second Lora module to continuously send the alarm signal in a broadcasting mode, and controls the communication module to continuously send the alarm signal to the background;
(20) The digital signal processing module judges whether the communication module or the second Lora module receives a work ending instruction, if so, the process is ended, otherwise, the step (21) is carried out;
(21) The digital signal processing module judges whether the alarm duration Tc is reached, if so, the step (13) is returned, otherwise, the step (19) is returned;
(22) And the digital signal processing module controls the second Lora module to send a data packet to the first Lora module, wherein the data packet comprises changed power P = P-a, and the step (4) is returned, wherein a is a preset constant.
2. The method of operating a railway protection net intrusion alarm system according to claim 1,
the initial value F0 of the working frequency F is equal to 27kHz, and the initial value P0 of the transmission power P is equal to 100W;
the sampling rate in the step (7) and the sampling rate in the step (17) are both 1MHz, and the sampling time duration is 1ms;
the step value b ranges from 0.01kHz to 0.1kHz.
3. The working method of a railway protection net intrusion alarm system according to claim 1,
the pulse duration of the sinusoidal pulse signal in the step (15) is 50ms to 500ms;
the alarm timer Tc takes a value of 5 to 10 minutes.
4. The working method of a railway protection net intrusion alarm system according to claim 1,
the value range of the preset threshold value R0 is 0.3 to 0.8;
the predetermined constant a ranges from 1 watt to 5 watts.
5. The working method of a railway protection net intrusion alarm system according to claim 1,
the model of the MCU module is STM32F103RCT6;
the model of the digital signal processing module is TMS320C203PZ80;
the sweep frequency signal generator module adopts a DDS chip AD5930 to synthesize sweep frequency signals;
the model of the ultrasonic driving module is Komada KMD-M4;
the first Lora module and the second Lora module are identical and adopt E32-433T20DC of Chengdu hundred million company;
the first ultrasonic transducer and the second ultrasonic transducer are completely the same and adopt HS-4PZT-4528 ultrasonic transducers of Taihe company;
the communication module is a 4G, 5G or GPRS communication module;
the storage module uses an EEPROM chip;
the ultrasonic signal adjusting module comprises a preceding-stage amplifying circuit, a band-pass filtering circuit and a subsequent-stage amplifying circuit which are sequentially connected in series;
the model of the analog-to-digital conversion module is AD9462BCPZ-125.
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