CN110936986A - Train passing early warning system and method - Google Patents
Train passing early warning system and method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
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- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
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Abstract
The invention relates to a train passing early warning system and a method, wherein the system comprises a vehicle-mounted device positioned on a train and a local device carried by a local user, the vehicle-mounted device comprises a sending end controller, a GSM receiving module and a GPS transmitting module which are connected with the sending end controller, and the local device comprises a receiving end controller, a GSM sending module, a GPS receiving module and a display; the GSM sending module sends a first request to the outside, the sending end controller controls the GPS sending module to continuously send the GPS position data after the GSM receiving module receives the first request, and the GPS receiving module receives the GPS position data and then is tracked and displayed by the display. Compared with the prior art, the invention has low cost, is beneficial to market promotion and layout, is designed aiming at industrial pain points and has strong practicability.
Description
Technical Field
The invention relates to an early warning system, in particular to a train passing early warning system and a train passing early warning method.
Background
In order to ensure the normal operation of the railway, maintenance personnel are needed to overhaul railway lines and equipment. In the process of emergency repair, the disastrous consequences can be caused because the train passes through and the maintenance personnel cannot avoid the train.
In the early stage, during the field construction of a work section, a special early warning person is often matched for reporting whether a train passes through, but the safety of the personnel on the construction field cannot be well guaranteed by the mode. The existing accident investigation has the problem that early warning personnel go to the toilet and cause the train to collide with the working personnel in construction.
Later, there was prior art that disclosed a solution that was a remote sensing type tunnel train passing early warning system. The train information receiving part is arranged on the wall surface of a train tunnel and comprises a power supply, and a signal acquisition device, a microcontroller and a wireless signal transmitting module which are respectively connected with the power supply, wherein the signal acquisition device is sequentially connected with the microcontroller and the wireless signal transmitting module; the handheld terminal device is arranged on a worker beside the train tunnel and comprises a rechargeable battery, a UHF transceiver, an upper computer and an alarm processing module, wherein the UHF transceiver, the upper computer and the alarm processing module are connected with the rechargeable battery, and the UHF transceiver is sequentially connected with the upper computer and the alarm processing module. When a train comes, prompt information is sent to workers beside a train tunnel so that the workers have enough time to evacuate from a driving route of the train, however, the early warning system has the following defects: 1. the positioning mode can only be used for positioning in the tunnel and cannot be used for positioning in other places; 2. the positioning mode has no redundant design, and the safety can not be ensured; 3. due to the design of no self-checking, the device can not be found in time when the device is in failure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a train passing early warning system and a train passing early warning method.
The purpose of the invention can be realized by the following technical scheme:
a train passing early warning system comprises a vehicle-mounted device positioned on a train and a local device carried by a local user, wherein the vehicle-mounted device comprises a sending end controller, a GSM receiving module and a GPS transmitting module which are connected with the sending end controller, and the local device comprises a receiving end controller, a GSM sending module, a GPS receiving module and a display which are connected with the receiving end controller;
the GSM sending module sends a first request to the outside, the sending end controller controls the GPS sending module to continuously send GPS position data after the GSM receiving module receives the first request, and the display carries out tracking display after the GPS receiving module receives the GPS position data.
The vehicle-mounted device further comprises a first RS485 wireless communication sending module used for sending a first early warning signal and a second RS485 wireless communication sending module used for sending a second early warning signal, the local device comprises a first RS485 wireless communication receiving module used for receiving the first early warning signal and a second RS485 wireless communication receiving module used for receiving the second early warning signal, and the maximum transmission distance of the first early warning signal is larger than the maximum transmission distance of the second early warning signal.
The local device also comprises an alarm for sending an alarm when receiving the second early warning signal.
The maximum transmission distance of the first early warning signal is 5 kilometers, and the maximum transmission distance of the second early warning signal is 3 kilometers.
The vehicle-mounted device also comprises a GPS positioning module, wherein the GPS positioning module comprises a demodulator, a phase-locked loop consisting of a phase discriminator, a first loop filter and a voltage-controlled oscillator which are connected in sequence, a frequency-locked loop consisting of a frequency discriminator, a second loop filter and a numerical control oscillator which are connected in sequence, and a Kalman filter, wherein the input end of the demodulator is respectively connected with the output sides of a digital intermediate frequency signal source and the Kalman filter, the output end of the demodulator is respectively connected with the input ends of the phase discriminator and the frequency discriminator, and the voltage-controlled oscillator and the numerical control oscillator are respectively connected with the input end of the Kalman filter;
the method comprises the steps that a received digital intermediate frequency signal is multiplied and demodulated by a locally generated carrier, then the signal is simultaneously sent into a phase discriminator and a frequency discriminator, the phase discriminator obtains an error signal containing high-frequency components and bandwidth noise by comparing the phase difference of an input signal and an output signal, the high-frequency signals and the bandwidth noise are filtered by a first loop filter to obtain a control signal, the control signal generates frequency deviation after passing through a voltage-controlled oscillator to change the phase of the output signal, and the phase of the output signal is continuously adjusted until the phase time of the input signal is consistent with that of the output signal; the carrier phase difference of the input signal and the output signal passes through the frequency discriminator, the frequency discrimination result passes through the second loop filter, the numerically-controlled oscillator is controlled to generate a local carrier, then the received signal is demodulated, and finally frequency locking is achieved.
A method of pre-warning a system as described, comprising:
step S1: after receiving the starting signal, the receiving end controller controls the GSM sending module to send a first request which is coded in advance;
step S2: after a GSM receiving module of a vehicle-mounted device carried on any train receives the first request, a sending end controller activates a GPS transmitting module;
step S3: the GPS transmitting module is activated and then continuously transmits the current GPS position data of the train;
step S4: the GPS receiving module receives the GPS position data continuously sent by the GPS transmitting module, and the display carries out tracking display.
The method further comprises the following steps:
step S5: and after the train passes through the position of the local device, the receiving end controller controls the GSM sending module to send a second request which is coded in advance, and after the GSM receiving module receives the second request, the sending end controller controls the GPS sending module to quit working.
In step S2, when the sending terminal controller activates the GPS transmitting module, the first RS485 wireless communication sending module and the second RS485 wireless communication sending module are activated synchronously,
the first RS485 wireless communication sending module and the second RS485 wireless communication sending module respectively and continuously send a first early warning signal and a second early warning signal after being activated,
after the first RS485 wireless communication receiving module receives the first early warning signal, the receiving end controller carries out first early warning,
and after the second RS485 wireless communication receiving module receives the second early warning signal, the receiving end controller carries out secondary early warning.
The maximum transmission distance of the first early warning signal is 5 kilometers, and the content of the first early warning is as follows: early warning that the train is 5 kilometers away from the user;
the maximum transmission distance of the second early warning signal is 3 kilometers, and the content of the second early warning is as follows: and the train is early-warned 3 kilometers away from the user.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention has low cost, is beneficial to market promotion and layout, is designed aiming at industrial pain points and has strong practicability.
2) The train position monitoring system has the advantages that the system is humanized in design, a user can visually see the train position on a screen, and the system also has an alarm function.
3) The two positioning modes work together, the limitation of using one positioning mode is made up, and the usability of the system is greatly improved.
4) In view of the limitations of GPS positioning, it is proposed to add RS458 wireless telecommunications modules to make up for this deficiency.
5) Aiming at the phenomena that the train runs at a high speed and the traditional positioning mode is inaccurate, a new GPS positioning mode is provided, and the positioning precision can be further improved.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a work flow diagram of the present invention;
FIG. 3 is a schematic diagram of a GPS location module;
wherein: 1. the vehicle-mounted device, 2, the local device, 11, the GSM receiving module, 12, the GPS transmitting module, 13, a first RS485 wireless communication transmitting module, 14, a second RS485 wireless communication transmitting module, 15, a battery, 16, a transmitting terminal controller, 21, the GSM transmitting module, 22, the GPS receiving module, 23, the first RS485 wireless communication receiving module, 24, the second RS485 wireless communication receiving module, 25, a display, 26, an alarm, 27, a switch, 28, a battery, 29, and a receiving terminal controller.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In order to ensure the normal operation of a railway line, a staff in a work section or a railway line patrol staff often risks the passing of a train to overhaul the line. Accidents caused by the fact that trains cannot pass by and stay away in time during work also occur sometimes. In order to avoid the accident, the application provides a train passing early warning system, and the train and the staff have a certain distance and early warning in advance to ensure the safety of the staff.
The train passing early warning system is realized by providing a train passing early warning system, as shown in fig. 1, comprising a vehicle-mounted device 1 positioned on a train and a local device 2 carried by a local user, wherein the vehicle-mounted device 1 comprises a sending end controller 16, a GSM receiving module 11 and a GPS transmitting module 12 which are both connected with the sending end controller 16, and the local device 2 comprises a receiving end controller 29, a GSM sending module 21, a GPS receiving module 22 and a display 25;
the GSM sending module 21 sends a first request to the outside, after the GSM receiving module 11 receives the first request, the sending-end controller 16 controls the GPS sending module 12 to continuously send GPS position data, and after the GPS receiving module 22 receives the GPS position data, the display 25 tracks and displays the GPS position data.
Namely, the distance between the train and the local is judged by the mutual communication between the two communication modules on the train and the local. When a certain distance is reached, the local module gives an alarm to prompt workers to evacuate the dangerous area. When a positioning requirement exists, the local GSM sending module 21 sends a request signal, the GSM receiving module 11 on the train starts to work after receiving the request signal, firstly, the GPS positioning module starts to work and sends GPS position data through the GPS sending module, and the local GPS receiving module 22 displays the position information after receiving the position information.
In order to avoid the unreliability of GPS data, the train is also provided with two RS485 remote wireless communication modules which start to work when the train is 5 km and 3 km away from the local area, so that the effectiveness of early warning is ensured. The vehicle-mounted device 1 further comprises a first RS485 wireless communication sending module 13 used for sending a first early warning signal and a second RS485 wireless communication sending module 14 used for sending a second early warning signal, the local device 2 comprises a first RS485 wireless communication receiving module 23 used for receiving the first early warning signal and a second RS485 wireless communication receiving module 24 used for receiving the second early warning signal, and the maximum transmission distance of the first early warning signal is larger than that of the second early warning signal. Correspondingly, the local device 2 further comprises an alarm 26 for issuing an alarm upon receiving the second warning signal. In addition, the maximum transmission distance of the first early warning signal is 5 kilometers, and the maximum transmission distance of the second early warning signal is 3 kilometers, so that a good early warning effect can be achieved.
When the application is applied specifically, after the user starts the switch, the receiving-end controller 29 receives the start signal and then controls the GSM transmitting module 21 to transmit the request response signal which is coded in advance, and the GSM receiving module 11 on the train in the range of ten kilometers nearby receives the request signal. Then the received request signal is sent to the sending end controller 16, the sending end controller 16 activates the GPS sending module at this time, the GPS sending module continues to work at this time, the GPS receiving module 22 receives the train position information that changes in real time and feeds the information back to the receiving end controller 29, and the controller displays the processed train position information on the display 25.
The transmitter controller 16 activates the GPS transmitting module and also activates the RS485 wireless communication transmitting module 1 and the RS485 wireless communication transmitting module 2. When the train is 5 km away from the user, the RS485 wireless communication receiving module 1 receives the coding information sent by the RS485 wireless communication sending module 1. And feeds this information back to the receiving-end controller 29. Similarly, when the distance is 3 km, the RS485 wireless communication receiving module 2 also receives the coded information sent by the RS485 wireless communication sending module 2, and feeds the information back to the receiving end controller 29. The receiver controller 29 processes the information in combination with time, position, speed, etc. and calculates the position of the train to be displayed on the display 25. When the train is within 3 kilometers of the distance, the alarm 26 is controlled to give an alarm to remind workers to avoid the train.
When the train passes through the rear receiving end controller 29, the GSM sending module 21 is controlled to send the coding information to the GSM receiving module 11, the GSM receiving module 11 forwards the coding information to the sending end controller 16, and the sending end controller 16 stops the whole module after receiving the coding information, and waits for the next activation of naming.
The working flow of the alarm system is shown in fig. 2, and in consideration of the unsatisfactory tracking performance of the GPS signal in a high dynamic environment, a GPS positioning system based on phase-locked loop (PIL) and frequency-locked loop (FIL) technologies is provided. See fig. 3.
The phase detector in fig. 3, a loop filter and a voltage-controlled oscillation module form the phase-locked loop, the phase detector obtains an error signal containing a high-frequency component and a bandwidth noise by comparing the phase difference between an input signal and an output signal, filters the high-frequency signal and the bandwidth noise through the loop filter to obtain a control signal, generates frequency offset after passing through the voltage-controlled oscillator to change the phase of the output signal, and continuously adjusts the phase of the output signal until the phases of the input signal and the output signal are kept consistent constantly. The frequency discriminator, loop filtering and numerical control oscillation in fig. 3 form a frequency-locked loop, the working principle of the frequency-locked loop is similar to that of a phase-locked loop, the carrier phase difference between an input signal and an output signal passes through the frequency discriminator, the frequency discrimination result passes through a loop filter, a Numerically Controlled Oscillator (NCO) is controlled to generate a local carrier, then a received signal is demodulated, and finally frequency locking is achieved.
Because the radial velocity of the carrier will generate a doppler frequency to add to the carrier, which shifts the carrier frequency and thus affects the tracking of the GPS signal, a Kalman filter is proposed, which integrates the intermediate frequency signals of multiple channels through a Kalman filter. And then, the carrier frequency and the pseudo code phase are converted and adjusted, and finally, the local carrier is consistent with the carrier of the received signal. And finally, multiplying and demodulating with the input digital intermediate frequency signal.
Claims (9)
1. A train passing early warning system is characterized by comprising a vehicle-mounted device positioned on a train and a local device carried by a local user, wherein the vehicle-mounted device comprises a sending end controller, a GSM receiving module and a GPS transmitting module which are connected with the sending end controller;
the GSM sending module sends a first request to the outside, the sending end controller controls the GPS sending module to continuously send GPS position data after the GSM receiving module receives the first request, and the display carries out tracking display after the GPS receiving module receives the GPS position data.
2. The train passing early warning system of claim 1, wherein the vehicle-mounted device further comprises a first RS485 wireless communication sending module for sending a first early warning signal and a second RS485 wireless communication sending module for sending a second early warning signal, the local device comprises a first RS485 wireless communication receiving module for receiving the first early warning signal and a second RS485 wireless communication receiving module for receiving the second early warning signal, and the maximum transmission distance of the first early warning signal is greater than the maximum transmission distance of the second early warning signal.
3. The train passing warning system of claim 2, wherein the local device further comprises an alarm for alarming upon receiving the second warning signal.
4. The train passing warning system of claim 2, wherein the maximum transmission distance of the first warning signal is 5 kilometers, and the maximum transmission distance of the second warning signal is 3 kilometers.
5. The train passing early warning system according to claim 1, wherein the vehicle-mounted device further comprises a GPS positioning module, the GPS positioning module comprises a demodulator, a phase-locked loop consisting of a phase discriminator, a first loop filter and a voltage-controlled oscillator which are connected in sequence, a frequency-locked loop consisting of a frequency discriminator, a second loop filter and a numerical control oscillator which are connected in sequence, and a kalman filter, wherein the input end of the demodulator is connected with the output sides of the digital intermediate frequency signal source and the kalman filter respectively, the output end of the demodulator is connected with the input ends of the phase discriminator and the frequency discriminator respectively, and the voltage-controlled oscillator and the numerical control oscillator are connected with the input end of the kalman filter respectively;
the method comprises the steps that a received digital intermediate frequency signal is multiplied and demodulated by a locally generated carrier, then the signal is simultaneously sent into a phase discriminator and a frequency discriminator, the phase discriminator obtains an error signal containing high-frequency components and bandwidth noise by comparing the phase difference of an input signal and an output signal, the high-frequency signals and the bandwidth noise are filtered by a first loop filter to obtain a control signal, the control signal generates frequency deviation after passing through a voltage-controlled oscillator to change the phase of the output signal, and the phase of the output signal is continuously adjusted until the phase time of the input signal is consistent with that of the output signal; the carrier phase difference of the input signal and the output signal passes through the frequency discriminator, the frequency discrimination result passes through the second loop filter, the numerically-controlled oscillator is controlled to generate a local carrier, then the received signal is demodulated, and finally frequency locking is achieved.
6. A method of pre-warning in a system according to claim 2, comprising:
step S1: after receiving the starting signal, the receiving end controller controls the GSM sending module to send a first request which is coded in advance;
step S2: after a GSM receiving module of a vehicle-mounted device carried on any train receives the first request, a sending end controller activates a GPS transmitting module;
step S3: the GPS transmitting module is activated and then continuously transmits the current GPS position data of the train;
step S4: the GPS receiving module receives the GPS position data continuously sent by the GPS transmitting module, and the display carries out tracking display.
7. The method of claim 6, further comprising:
step S5: and after the train passes through the position of the local device, the receiving end controller controls the GSM sending module to send a second request which is coded in advance, and after the GSM receiving module receives the second request, the sending end controller controls the GPS sending module to quit working.
8. The method according to claim 6, wherein in step S2, when the transmitting end controller activates the GPS transmitting module, the first RS485 wireless communication transmitting module and the second RS485 wireless communication transmitting module are synchronously activated,
the first RS485 wireless communication sending module and the second RS485 wireless communication sending module respectively and continuously send a first early warning signal and a second early warning signal after being activated,
after the first RS485 wireless communication receiving module receives the first early warning signal, the receiving end controller carries out first early warning,
and after the second RS485 wireless communication receiving module receives the second early warning signal, the receiving end controller carries out secondary early warning.
9. The method of claim 8,
the maximum transmission distance of the first early warning signal is 5 kilometers, and the content of the first early warning is as follows: early warning that the train is 5 kilometers away from the user;
the maximum transmission distance of the second early warning signal is 3 kilometers, and the content of the second early warning is as follows: and the train is early-warned 3 kilometers away from the user.
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Application publication date: 20200331 |