Broadband power line carrier communication method, outdoor monitoring system, storage medium and equipment

Abstract

The invention relates to the technical field of rail transit, in particular to a broadband power line carrier communication method and system, a medium and equipment applied to a rail circuit outdoor monitoring system, and the method comprises the steps that a power line carrier processing module issues a broadcast frame through the frequency of a preset frequency band of a channel where the power line carrier processing module is located; the acquisition extension sets receive the broadcast frames in a polling manner according to preset frequency bands of channels where the acquisition extension sets are located, response frames are uploaded if receiving succeeds, and otherwise, the acquisition extension sets are not networked; judging whether all acquisition extensions in each channel bus are networked or not; if the extension sets are not networked in the channel bus, recording the number of the networked extension sets, replacing the frequency band and re-issuing the broadcast frame; if all the extensions in the channel bus are networked, locking the frequency band, issuing a configuration frame, and receiving a configuration return frame of each extension; if the configuration return frame is successfully received, the extension networking configuration is successful; after networking configuration succeeds, the acquisition extensions and the communication host can carry out power line carrier communication. According to the invention, the signal transmission anti-interference capability and the data transmission security can be enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and in particular to a broadband power line carrier communication method, an outdoor monitoring system, a storage medium and a device applied to an outdoor monitoring system of a track circuit. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] PLC (Power Line Carrier) communication is a technology that uses power transmission and distribution lines as a transmission medium for communication. Due to problems such as bandwidth, interference, and security, there are significant application problems and security hazards in direct use.

[0004] PLC (Power Line Carrier) communication is divided into two types: narrowband (40kHz - 500kHz) and broadband (1MHz - 30MHz). Due to the complex outdoor electromagnetic environment of railways, especially in stations, there are many signal devices and network devices, and the traction current interference is large. The equipment frequency, communication frequency, or high-order harmonics of the traction current are distributed within the bandwidth of narrowband PLC, which has a greater impact on narrowband PLC.

[0005] Since the power supply and communication of PLC (Power Line Carrier) technology are on the same channel and do not require additional communication lines, it is widely used in the power grid. However, due to the pulse interference of the power line itself and the impedance difference of the transmission cable, the signal loss is large during transmission and long-distance transmission cannot be carried out.

[0006] In view of the above defects, the present invention has made improvements. Summary of the Invention

[0007] In order to overcome the deficiencies of the background technique, the present invention provides a broadband power line carrier communication method, an outdoor monitoring system, a storage medium and a device applied to an outdoor monitoring system of a track circuit. It adopts a broadband PLC communication method with multi-band adaptive adjustment, sends broadcast frames by changing the frequency band, and receives broadcast frames in the way of polling according to a preset frequency band, which not only enhances the anti-interference ability of signal transmission, but also enhances the security performance of data transmission, thus solving the problem that power line carrier cannot perform long-distance stable communication.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] In a first aspect, a broadband power line carrier communication method applied to an outdoor monitoring system of a track circuit is provided. The outdoor monitoring system of the track circuit includes a communication host and acquisition extenders. The communication host includes multiple power line carrier processing modules, and each power line carrier processing module is connected to multiple acquisition extenders through a channel bus. The method includes:

[0010] The power line carrier processing module in the communication host forms a network by sending broadcast frames at the frequencies of the preset frequency bands of the channels where it is located;

[0011] The acquisition slave unit polls and receives broadcast frames according to the preset frequency bands of the channels where it is located. If the reception is successful, it uploads an acknowledgment frame to the communication host; otherwise, the acquisition slave unit is not networked.

[0012] Judge whether all the acquisition slave units in each channel bus have been networked respectively;

[0013] If there are acquisition slave units in a channel bus that are not networked, record the number of networked acquisition slave units, change the frequency band, send broadcast frames again, and form a network again;

[0014] If all the acquisition slave units in a channel bus have been networked, lock the frequency band, send a configuration frame, and receive the configuration return frames of each acquisition slave unit;

[0015] If the configuration return frame of an acquisition slave unit is received successfully, the network configuration of the acquisition slave unit is successful;

[0016] After the network configuration is successful, the acquisition slave unit and the communication host perform data communication through the power line carrier communication method.

[0017] Furthermore,

[0018] After changing the frequency band and sending broadcast frames again, judge whether there are acquisition slave units in the channel bus that are not networked;

[0019] If there are acquisition slave units in the channel bus that are not networked, judge whether the number of times of updating the frequency band exceeds the preset number of update times;

[0020] If it exceeds the preset number of update times, record the numbers of the acquisition slave units that are not networked, judge the frequency band with the largest number of on-network acquisition slave units, lock the frequency band and send a configuration frame;

[0021] If it does not exceed the preset number of update times, record the number of networked acquisition slave units, change the frequency band, send broadcast frames again, and form a network again.

[0022] Furthermore,

[0023] The communication host includes four power line carrier processing modules, which respectively correspond to channels PLC1 to PLC4;

[0024] Multiple different frequency bands are preset for each of channels PLC1 to PLC4, and the frequency range of the preset frequency bands is 1 MHz to 10 MHz.

[0025] Furthermore,

[0026] The initial frequencies of channels PLC1 to PLC4 are 1.01 MHz, 1.31 MHz, 1.61 MHz, and 1.91 MHz respectively;

[0027] Each channel adjusts the frequency independently, supports 8 times of frequency adjustment, and each time it is adjusted, 1Mhz will be increased on the initial frequency.

[0028] Furthermore,

[0029] The acquisition slave unit communicates with the communication host through power line carrier communication, including:

[0030] The acquisition slave unit uploads a data frame;

[0031] The communication host receives the data frame;

[0032] The communication host issues an online status query frame according to a preset query period;

[0033] The acquisition slave unit receives the online status query frame, and if the reception is successful, it uploads a status frame;

[0034] The communication host receives the status return frame of the acquisition slave unit, and if the reception is successful, the communication is normal.

[0035] Furthermore,

[0036] The acquisition slave unit sets a static period according to a configuration frame;

[0037] After the networking configuration is successful, the acquisition slave unit uploads a data frame according to the set static period.

[0038] Furthermore,

[0039] The acquisition slave unit is also configured to upload the dynamic period of the data frame, including:

[0040] When the acquisition slave unit identifies that the acquired data has a mutation, the acquisition slave unit immediately uploads a data frame and continuously uploads data frames multiple times according to a preset dynamic period.

[0041] In a second aspect, an outdoor monitoring system for track circuits is also provided, and the system includes indoor equipment and an outdoor transmission subsystem;

[0042] The indoor equipment includes a communication host;

[0043] The outdoor transmission subsystem includes a plurality of integrated outdoor transmission units, and each outdoor transmission unit includes a box body and outdoor transmission equipment and outdoor monitoring equipment arranged in the box body. An internal partition structure for separating the outdoor transmission equipment and the outdoor monitoring equipment is arranged in the box body, and the outdoor monitoring equipment includes an acquisition slave unit;

[0044] The communication between the communication host and the acquisition slave unit adopts the aforementioned broadband power line carrier communication method applied to the outdoor monitoring system for track circuits.

[0045] Based on the same inventive concept, the present invention also provides a computer-readable storage medium storing one or more programs, which, when executed, can implement the aforementioned broadband power line carrier communication method applied to the outdoor monitoring system of track circuits.

[0046] Based on the same inventive concept, the present invention also provides an electronic device, including a processor, a communication interface, the aforementioned computer-readable storage medium as described above, and a communication bus; wherein, the processor, the communication interface, and the computer-readable storage medium communicate with each other through the communication bus; the processor is used to execute the program stored in the computer-readable storage medium.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0048] 1. Adopting a broadband PLC communication method with multi-band adaptive adjustment, the communication host issues broadcast frames by changing the frequency band, and the acquisition slave unit receives the broadcast frames in a polling manner according to the preset frequency band, which not only enhances the anti-interference ability of signal transmission but also enhances the security performance of data transmission, thus solving the problem that power line carrier cannot communicate stably over long distances;

[0049] 2. The 4-way PLC channels transmit data using signals with an ultra-wide bandwidth of 1MHz - 10Mhz and different frequency bands, which can improve the anti-interference and secure communication capabilities of PLC communication;

[0050] 3. The acquisition slave unit is configured with a function of dynamically uploading data frames at periodic intervals, which can respond more quickly to on-site emergencies. When the acquisition slave unit identifies a mutation in the acquired data, it immediately uploads a data frame and continuously uploads data frames multiple times according to the preset dynamic period.

[0051] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification or understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, the claims, and the drawings.

[0052] The present invention will be further described below with reference to the accompanying drawings. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0054] Figure 1Schematic flow chart of a broadband power line carrier communication method according to an embodiment of the present invention;

[0055] Figure 2 Schematic flow chart of the networking process of the PLC processing module in broadband power line carrier communication according to an embodiment of the present invention;

[0056] Figure 3 Schematic flow chart of the networking process of the acquisition extension in broadband power line carrier communication according to an embodiment of the present invention;

[0057] Figure 4 Schematic flow chart of the communication process of the PLC processing module in broadband power line carrier communication according to an embodiment of the present invention;

[0058] Figure 5 Schematic flow chart of the communication process of the acquisition extension in broadband power line carrier communication according to an embodiment of the present invention;

[0059] Figure 6 Schematic structure diagram of an outdoor monitoring system for track circuits according to an embodiment of the present invention;

[0060] Figure 7 Schematic structure diagram of an outdoor transmission subsystem according to an embodiment of the present invention;

[0061] Figure 8 Schematic structure diagram of an electronic device according to an embodiment of the present invention. Detailed implementation manners

[0062] To make the objectives, technical solutions, and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] As Figures 1 to 5 shown, the first embodiment of the present invention provides a broadband power line carrier communication method applied to an outdoor monitoring system for track circuits. The outdoor monitoring system for track circuits includes a communication host and acquisition extensions. The communication host includes multiple power line carrier processing modules, and each power line carrier processing module is connected to multiple acquisition extensions through a channel bus. The method includes:

[0064] The power line carrier processing module in the communication host networks by sending a broadcast frame through the frequency of the preset frequency band of the channel where it is located;

[0065] The acquisition extensions poll and receive the broadcast frame according to the preset frequency band of the channel where they are located. If the reception is successful, an acknowledgment frame is uploaded to the communication host; otherwise, the acquisition extension is not networked.

[0066] Judge whether all acquisition sub - machines in each channel bus have been networked respectively;

[0067] If there are acquisition sub - machines in a channel bus that have not been networked, record the number of networked acquisition sub - machines, change the frequency band and re - send the broadcast frame to re - network;

[0068] If all acquisition sub - machines in a channel bus have been networked, lock the frequency band, send the configuration frame, and receive the configuration return frames of each acquisition sub - machine;

[0069] If the configuration return frame of an acquisition sub - machine is received successfully, the network configuration of this acquisition sub - machine is successful;

[0070] After the network configuration is successful, the acquisition sub - machine and the communication host perform data communication through the power line carrier communication method.

[0071] In the above technical solution, networking is carried out first between the communication host and the acquisition sub - machine, and then network configuration is carried out. After the network configuration is successful, the acquisition sub - machine and the communication host can perform data communication through PLC communication; the above technical solution adopts a broadband PLC communication method with multi - band adaptive adjustment. The communication host sends the broadcast frame by changing the frequency band, and the acquisition sub - machine receives the broadcast frame in the way of polling according to the preset frequency band, which not only enhances the anti - interference ability of signal transmission, but also enhances the security performance of data transmission, thus solving the problem that power line carrier cannot communicate stably over long distances. The acquisition sub - machine in this embodiment is also simply referred to as the sub - machine.

[0072] Since the PLC channel (i.e., the power line carrier channel) uses outdoor cable communication and there are differences in cable impedance, sending the broadcast frame by changing the frequency band can not only increase the anti - interference ability of signal transmission, but also increase the security performance of data transmission. Cables with different lengths and materials have different equivalent inductances, coupling capacitances and resistances, and show different impedances to signals of different frequencies. By changing the frequency band (i.e., replacing the frequency band), when the cable length and material are fixed, the communication signal transmission quality can reach the optimal effect. Since the frequencies are different, the interference between channels will be reduced, and the frequency band is variable, making it more difficult to illegally crack the data on the PLC, thus improving the security of data transmission.

[0073] In the railway outdoor scenario, the main external interference signals include high - order harmonics of traction current, and the operating frequencies of other outdoor signal devices will be coupled to the cable through space. There are differences in cable impedance, and the coupled signal intensities are also different. By changing the frequency of the sent broadcast frame, the best - quality broadcast frame frequency for transmission can be screened out to achieve the purpose of anti - interference.

[0074] The following further illustrates the above broadband power line carrier communication method by taking the communication host with four power line carrier processing modules as an example.

[0075] The communication processing flow between the PLC processing module and the outdoor acquisition extension includes a networking process and a communication process, which will be described separately below.

[0076] As Figure 2 shown, an embodiment of the present invention provides a networking process of the PLC processing module when the PLC processing module communicates with the acquisition extension. The networking process will be further described below.

[0077] As a preferred technical solution, the communication host includes 4 PLC processing modules (i.e., power line carrier processing modules). The 4 PLC processing modules respectively correspond to channels PLC1 to PLC4. In this embodiment, according to the railway application scenario and transmission distance, the frequency range of the preset frequency band of the channel is selected as 1 MHz to 10 MHz, which belongs to broadband PLC communication. Multiple different frequency bands are preset for each of the channels PLC1 to PLC4. The 4 channels PLC1 to PLC4 send broadcast frames through the frequencies of the preset frequency bands, that is, the 4 PLC processing modules of the communication host send broadcast frames through the frequencies of the preset frequency bands of their respective channels for networking, which can facilitate the realization of multi-band adaptive adjustment.

[0078] In some embodiments, the initial frequencies of channels PLC1 to PLC4 are 1.01 MHz, 1.31 MHz, 1.61 MHz, and 1.91 MHz respectively; the 4 channels independently adjust the frequencies. This embodiment supports 8 frequency adjustments. Each time an adjustment is made, 1 MHz is added to the initial frequency. The 4 channels are independently adjusted. After the channels are not adjusted or adjusted, the corresponding frequencies will be locked.

[0079] The frequency setting rules of the 4 PLC channels in this embodiment are shown in the following table:

[0080]

[0081] Among them, the minimum frequency difference between adjacent channels is 0.3 MHz, which can help reduce the interference between channels.

[0082] In the above table, each time the frequency is adjusted by 1 MHz, and the minimum frequency difference between adjacent channels is 0.3 MHz. These parameters are all obtained through actual application simulation calculations, which can help better ensure PLC communication.

[0083] In some embodiments, in order to shorten the networking time, the broadcast frame is generally set as a short message of 1 to 2 bytes. After the acquisition extension parses the broadcast frame, it will upload an acknowledgment frame with a length of 1 byte.

[0084] As a preferred technical solution, if there are acquisition extenders in a channel bus that are not networked, record the number of networked acquisition extenders, change the frequency band and resend the broadcast frame to re-network; after changing the frequency band and resending the broadcast frame, determine whether there are acquisition extenders in the channel bus that are not networked; if there are acquisition extenders in the channel bus that are not networked, determine whether the number of times of updating the frequency band exceeds the preset update times; if it exceeds the preset update times, record the numbers of the non-networked acquisition extenders, determine the frequency band with the largest number of on-network acquisition extenders, lock this frequency band and send the configuration frame; if it does not exceed the preset update times, record the number of networked acquisition extenders, change the frequency band and resend the broadcast frame to re-network.

[0085] In this embodiment, if there are acquisition extenders on a channel bus that are not successfully networked, the channel bus changes the frequency band according to the set rules (as shown in the above table), resends the broadcast frame, and networks. The preset update times in this embodiment is 8 times. If there are still acquisition extenders that are not networked after changing the frequency band 8 times, record the numbers of the non-networked acquisition extenders, determine the frequency band with the largest number of on-network acquisition extenders, lock this frequency, and send the configuration frame. Other processes are the same as the main process.

[0086] In most cases, all acquisition extenders will be normally networked (i.e., grouped) without adjusting the frequency band. Only for some stations, that is, in special cases where the traction current harmonic interference is large and the section is long, it is necessary to adjust the frequency band (i.e., the transmission frequency) to re-network.

[0087] As a preferred technical solution, if all acquisition extenders in a channel bus have been networked, lock this frequency band, send the configuration frame, and receive the configuration return frames of each acquisition extender; after the acquisition extenders on the 4 channel buses of PLC1 to PLC4 are all successfully on the network, lock the corresponding frequency (i.e., lock the corresponding frequency band) and send the configuration frame. Specifically in implementation, the communication host sends the configuration frame through the PLC processing module. The configuration frame mainly includes the static upload period of the acquisition extender communication data (used to set the static period of the acquisition extender), and also includes the signal frequency of the track circuit equipment to be acquired, the locked frequency, and the system time, etc. After successfully receiving the configuration return frame, the networking ends.

[0088] As Figure 3 shown, the embodiment of the present invention also provides a networking process of an acquisition extender when the PLC processing module communicates with the acquisition extender. The following further explains this networking process.

[0089] As a preferred technical solution, after the acquisition extender is powered on, it performs self-check. If the self-check fails, record the fault status and then shut down. If the self-check is successful, poll, receive, and parse the broadcast frame according to the frequency band of the configured channel; the acquisition extender determines the channel it is in according to the configuration and polls, receives, and parses the broadcast frame according to the preset frequency band of the channel it is in. If the reception and parsing are successful, upload the response frame to the communication host, otherwise this acquisition extender is not networked.

[0090] In this embodiment, there is only one frequency for each PLC channel; the acquisition extender obtains the channel it belongs to through the configured address code; the networking frequency of the acquisition extender is determined according to the channel it belongs to, and the acquisition extender can know the channel it is in through the address code. For example: Channel PLC1 is assigned as the upper left channel, PLC2 is assigned as the upper right channel, PLC3 is the lower left channel, and PLC4 is the lower right channel. Before the frequency is locked, all the acquisition extenders in this channel bus will poll and analyze the information (i.e., broadcast frame) sent from this channel according to the 8 frequencies in the above table. For example, if the frequency 1.01 MHz is sent from channel PLC1, the acquisition extender will poll and analyze from 1.01 MHz to 9.01 MHz. Among them, the address code, the locked frequency (i.e., the networking frequency), and the communication basic cycle (including the static cycle and the dynamic cycle) are all numbers of several bytes. For example: the address code is 2 bytes, the locked frequency is 1 byte, and the communication basic cycle is 1 byte.

[0091] In this embodiment, manual configuration mainly configures the address codes of the acquisition extenders under the four channels of the communication host PLC1 - PLC4, as well as the corresponding address codes of the acquisition extenders and the signal carrier frequencies of the track circuits. For example: Under channel PLC1 are the acquisition extenders with address codes 1 - 20, under channel PLC2 are the acquisition extenders with address codes 21 - 40, under channel PLC3 are the acquisition extenders with address codes 41 - 60; under channel PLC4 are the acquisition extenders with address codes 61 - 80.

[0092] In this embodiment, the acquisition extender number (i.e., the acquisition extender code) is the production code, which is recorded as the factory's ex-factory record, and the acquisition extender address code is the field section record, which serves as the on-site identity identifier of the acquisition extender, and the two are different. This is mainly because the acquisition extenders installed on-site are uncertain, so during debugging, it is necessary to add address codes to the acquisition extenders.

[0093] In this embodiment, if the broadcast frame is successfully received and parsed, an acknowledgment frame is uploaded. At this time, the acquisition extender has been networked. Otherwise, according to the frequency band adjustment rules in the above table, after changing the frequency band, it is parsed again until all frequency bands are polled. If it is still not parsed correctly, the networking fails, and at this time, the acquisition extender is not networked.

[0094] In this embodiment, after the acquisition extender is successfully networked, it receives the configuration frame sent by the PLC processing module in the communication host. After successful reception, it locks the frequency band according to the configuration frame, sets the data frame upload period, sets the system time, and sets the signal parsing frequency of the track circuit equipment to be acquired. Generally, the networking frequency of the acquisition extender remains unchanged after being locked, unless there is a situation where communication cannot be established after power-on again. In this embodiment, locking the frequency band means locking the corresponding frequency.

[0095] In some embodiments, according to the configuration frame, to save bus resources, the acquisition slave sets a static period, which is a fixed period, and a fixed number between 100 ms and 5 s is set. The value range of this static period is estimated according to the channel data volume. Mainly, without affecting the real-time data transmission, the bus resources are occupied as little as possible to ensure stable transmission. The less data volume is transmitted by PLC communication, the higher the communication quality is.

[0096] After the acquisition slave receives the broadcast frame and the configuration frame, it will send a configuration return frame. After receiving the configuration return frame, the communication host considers the acquisition slave to be online. Then, every 1 minute, it will send an online status frame to query the online status of the slave. If the communication host has not received the configuration return frame of a certain acquisition slave after continuously sending 10 broadcast frames, the communication host determines that the acquisition slave is offline or not online at this frequency.

[0097] After the communication host and the acquisition slave complete networking and configuration (i.e., the networking configuration is successful), they enter the communication process.

[0098] As a preferred technical solution, the acquisition slave and the communication host perform data communication through power line carrier communication, including:

[0099] The acquisition slave uploads a data frame;

[0100] The communication host receives the data frame;

[0101] The communication host issues an online status query frame according to a preset query period;

[0102] The acquisition slave receives the online status query frame, and if the reception is successful, it uploads a status frame;

[0103] The communication host receives the status return frame of the acquisition slave, and if the reception is successful, the communication is normal.

[0104] As Figure 4 shown, the embodiment of the present invention provides a communication process of the PLC processing module when communicating with the acquisition slave. The following further explains this communication process.

[0105] As a preferred technical solution, the preset query period in this embodiment is 1 minute. After the communication host and the acquisition slave successfully complete networking (i.e., complete networking and configuration), it will receive the data frame uploaded by the acquisition slave, and at the same time issue an online status query frame according to the set 1-minute period. This query frame is equivalent to the heartbeat frame in communication.

[0106] In this embodiment, the online status query frame is to query the online status of the acquisition slave. After the query is sent and completed, it waits to receive the status return frame. If not all receptions are successful and the communication does not time out, it continues to wait for reception. If it times out, it records the numbers of the acquisition slaves that have not sent status frames or data frames.

[0107] In some embodiments, the data frame includes the traction - side current and voltage information of the outdoor main device (i.e., the outdoor transmission device hereinafter), the signal - side current and voltage information, the voltage information at the DC - blocking capacitor terminal, the deterioration status information of the lightning protection module, and the temperature and humidity information.

[0108] As Figure 5 As shown, an embodiment of the present invention provides a communication process of the acquisition extension when the PLC processing module communicates with the acquisition extension. The following further elaborates on this communication process.

[0109] As a preferred technical solution, the acquisition extension sets a static period according to the configuration frame; after the networking configuration is successful, the acquisition extension uploads the data frame according to the set static period. In this embodiment, after the communication host and the acquisition extension are successfully networked (i.e., the networking and configuration are completed), the acquisition extension uploads the data frame according to the configured static period.

[0110] As a preferred technical solution, the acquisition extension is also configured to upload the data frame with a dynamic period, including: when the acquisition extension identifies that the acquired data has a mutation, the acquisition extension immediately uploads the data frame and continuously uploads the data frame multiple times according to a preset dynamic period.

[0111] In order to quickly respond to on - site emergencies, for example, when the device to be acquired has a sudden failure. At this time, in order to ensure a rapid alarm of the failure, the acquisition extension in this embodiment adds the function of uploading with a dynamic period. The dynamic period is a timely period, and when the acquired data of the acquisition extension changes greatly, it uploads in a timely manner.

[0112] For the dynamic - period upload of the data frame, the specific method is as follows: when the acquisition extension identifies that the acquired data has a mutation, for example, the normal acquired current is 100 mA, and the acquired value suddenly appears as a continuous large current or small current, such as above 200 mA or below 50 mA (set the threshold according to the on - site situation in advance), the acquisition extension immediately uploads the data frame and continuously uploads it multiple times (for example, 5 times) at a 10 - ms period (i.e., the preset dynamic period).

[0113] As Figure 6 As shown, the second embodiment of the present invention provides a track - circuit outdoor monitoring system, and the system includes indoor equipment and an outdoor transmission subsystem;

[0114] The indoor equipment includes a communication host;

[0115] The outdoor transmission subsystem includes a plurality of integrated outdoor transmission units. Each outdoor transmission unit includes a box body (in this embodiment, the box body directly uses the box body of a choke transformer), outdoor transmission equipment and outdoor monitoring equipment disposed inside the box body. An internal partition structure for separating the outdoor transmission equipment and the outdoor monitoring equipment is disposed inside the box body. The outdoor monitoring equipment includes a collection extension unit;

[0116] The communication between the communication host and the collection extension unit adopts the broadband power line carrier communication method applied to the track circuit outdoor monitoring system as described above.

[0117] Due to the adoption of the broadband power line carrier communication method applied to the track circuit outdoor monitoring system, the track circuit outdoor monitoring system in this embodiment not only enhances the anti-interference ability of signal transmission, but also enhances the security performance of data transmission, thus solving the problem that power line carrier cannot communicate stably over long distances.

[0118] As a preferred technical solution, as Figure 6 shown, the indoor equipment includes a communication host, a power supply and a protection device. Among them, T1 to T4 are power frequency transformers, and their main function is to provide power for PLC communication and prevent PLC frequency signal crosstalk. In the protection circuit, in order to protect against outdoor lightning and traction current, horizontal and vertical lightning protection is added to channels 1-4.

[0119] Figure 6 PLC1 to PLC4 in are 4-way PLC interfaces, which are connected to the outdoor collection extension unit after passing through lightning protection modules;

[0120] The communication host integrates 4-way PLC processing modules 1 to 4, which are used to configure the collection extension unit and receive and analyze the collection data (i.e., data frames) uploaded by the outdoor collection extension unit. To improve the anti-interference and secure communication capabilities of PLC communication, the 4-way PLC uses a super bandwidth of 1MHz - 10Mhz, and signals in different frequency bands transmit data. According to the complex application scenarios of railways, protection circuits and filter circuits are added to the inlet end, sending end and receiving end of the PLC processing module.

[0121] The CPU module is the core processing module of the communication host, and its external interfaces support interfaces such as CAN (CAN1, CAN2), Ethernet (ETH1), etc. It is used to receive the collection data uploaded by the 4-way PLC module and upload the data to the diagnostic host or other upper computers through the external interfaces.

[0122] The existing outdoor transmission unit uses a choke transformer box. Due to the fixed internal structure, there is no reserved installation and acquisition position for the acquisition system (i.e., monitoring equipment), and the acquisition system can only be installed in a split manner. When installed in a split manner, the current transformers used by the acquisition system are placed outside the equipment to be acquired, which is greatly affected by the external environment and has a high failure rate. In this embodiment, the outdoor transmission unit adopts an integrated design. The outdoor transmission unit effectively utilizes the structure of the choke transformer box, combines the outdoor transmission equipment of the track circuit and the outdoor monitoring equipment into one, and through internal structure separation, all acquisition devices are arranged inside the box. Through the protection level of the box, the service life of the acquisition devices is increased, the degree of equipment integration is improved, and at the same time, the monitoring equipment will not affect or reduce the normal operation and safety level of the outdoor transmission equipment.

[0123] The structural block diagram of the outdoor transmission subsystem in this embodiment is as Figure 7 shown in Figure 7 :

[0124] The main equipment area is the placement area of the outdoor transmission equipment. Among them, T1 is the choke transformer coil, and 4-9 are signal coils, and different turns ratios can be adjusted according to requirements. C1 and C2 are DC-blocking capacitors, mainly to prevent the DC component from the traction coil from affecting the indoor equipment. C1 and C2 are redundantly connected. After passing through C1 and C2, it reaches E1 and E2. The E1 and E2 ends are signal interface ends and are connected to the indoor equipment through cables.

[0125] 1-3 are traction side coils. The 1 and 2 ends are signal interface ends and are connected to the outdoor rail through a rail lead wire. 3 is the center connection point and is connected to adjacent outdoor transmission equipment through a connecting plate. The outdoor transmission equipment presents a low impedance to the power frequency signal of the traction current, realizes the conduction and balance of the traction return current at both ends of the mechanical insulation joint rail; at the same time, it presents a high impedance to 1.7 kHz - 2.6 kHz, separates the signal current in adjacent track circuits, and does not consume the frequency shift signal in this section.

[0126] The monitoring area is the placement area of the outdoor monitoring equipment. Among them, A1 - A3 are current acquisition current transformers, all of which are non-contact through-core current transformers. A1 acquires the frequency shift and traction current signals of the left traction coil; A2 acquires the frequency shift and traction current signals of the right traction coil; A3 acquires the frequency shift current of the signal coil;

[0127] V1 - V5 are non-contact voltage transformers, which adopt the principle of electric field induction. According to the potential difference formed by the interaction between charges, the measurement of the electric field strength is realized by measuring the capacitance between electrodes, and the measurement signal enters the acquisition sub-machine for calculation and processing. V1 and V2 measure the voltages at both sides of the traction side coils; V3 and V4 measure the voltages at both ends of the DC-blocking capacitors C1 and C2; V4 and V5 measure the voltages at both ends of the signal coils E1 and E2.

[0128] The deterioration state node is set on the lightning protection module base and is equipped with a telecontrol terminal. The deterioration state of the lightning protection module can be collected through 1O.

[0129] The temperature and humidity sensor is fixed inside the outdoor transmission device, and can collect the temperature and humidity inside the device in real time.

[0130] The collected signals are sent to the acquisition sub - machine for processing. The acquisition sub - machine reserves fiber optic interfaces and wireless interfaces, and supports fiber optic communication and wireless communication.

[0131] Both PLC communication and fiber optic communication are wired communications. Problems with fiber optic communication: Since there are many outdoor devices and many acquisition points in the station, multiple fiber optic lines need to be fused. The actual operation is complex. Moreover, most existing stations do not have fiber optic cables laid. Re - laying has a high cost and a long cycle, and will not be re - laid without special circumstances. Problems with wireless communication: There are mainly problems with security, transmission quality, and coverage distance. Based on the complex application scenarios of railways, since both fiber optic communication and wireless communication have their own problems, the embodiments of the present invention adopt PLC communication and propose a broadband power line carrier communication method applied to the outdoor monitoring system of track circuits.

[0132] Based on the same inventive concept, the present invention also provides a computer - readable storage medium storing one or more programs, which when executed can implement the aforementioned broadband power line carrier communication method applied to the outdoor monitoring system of track circuits.

[0133] Based on the same inventive concept, the present invention also provides an electronic device, as Figure 8 shown, including a processor, a communication interface, the aforementioned computer - readable storage medium, and a communication bus; wherein, the processor, the communication interface, and the computer - readable storage medium communicate with each other through the communication bus; the processor is used to execute the programs stored in the computer - readable storage medium.

[0134] It should be noted that for the foregoing method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the present invention.

[0135] In the above - mentioned embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0136] For the parts not involved in the above embodiments, they are the same as or can be implemented by the prior art, and no further description will be given here.

[0137] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A broadband power line carrier communication method applied to an outdoor monitoring system of a track circuit. The outdoor monitoring system of the track circuit includes a communication host and acquisition slave units. The communication host includes multiple power line carrier processing modules, and each power line carrier processing module is connected to multiple acquisition slave units through a channel bus. It is characterized in that, The method includes: The power line carrier processing module in the communication host issues a broadcast frame through the frequency of the preset frequency band of the channel where it is located for networking; The acquisition slave unit polls and receives the broadcast frame according to the preset frequency band of the channel where it is located. If the reception is successful, it uploads an acknowledgment frame to the communication host, otherwise the acquisition slave unit is not networked; Judge whether all the acquisition slave units in each channel bus have been networked respectively; If there is an acquisition slave unit in a channel bus that is not networked, record the number of networked acquisition slave units, change the frequency band and issue a broadcast frame again to re-network; If all the acquisition slave units in a channel bus have been networked, lock the frequency band, issue a configuration frame, and receive the configuration return frames of each acquisition slave unit; If the configuration return frame of an acquisition slave unit is received successfully, the networking configuration of this acquisition slave unit is successful; After the networking configuration is successful, the acquisition slave unit and the communication host perform data communication through the power line carrier communication method.

2. The broadband power line carrier communication method applied to the outdoor monitoring system of the track circuit according to claim 1, characterized in that After changing the frequency band and issuing a broadcast frame again, judge whether there is an acquisition slave unit in the channel bus that is not networked; If there is an acquisition slave unit in the channel bus that is not networked, judge whether the number of times of updating the frequency band exceeds the preset number of updates; If it exceeds the preset number of updates, record the numbers of the non-networked acquisition slave units, judge the frequency band with the largest number of in-network acquisition slave units, lock the frequency band and issue a configuration frame; If it does not exceed the preset number of updates, record the number of networked acquisition slave units, change the frequency band and issue a broadcast frame again to re-network.

3. The broadband power line carrier communication method applied to the outdoor monitoring system of the track circuit according to claim 1, characterized in that The communication host includes four power line carrier processing modules, corresponding to channels PLC1 to PLC4 respectively; Each of channels PLC1 to PLC4 presets multiple different frequency bands, and the frequency range of the preset frequency band is 1 MHz to 10 MHz.

4. The broadband power line carrier communication method applied to the outdoor monitoring system of the track circuit according to claim 3, characterized in that The initial frequencies of channels PLC1 to PLC4 are 1.01 MHz, 1.31 MHz, 1.61 MHz, and 1.91 MHz respectively; Each channel independently adjusts the frequency, supports 8 times of frequency adjustment, and each time it is adjusted, 1 MHz will be added to the initial frequency.

5. The broadband power line carrier communication method applied to the outdoor monitoring system of the track circuit according to any one of claims 1-4, characterized in that The data communication between the acquisition slave unit and the communication host through the power line carrier communication method includes: The acquisition slave unit uploads a data frame; The communication host receives the data frame; The communication host issues an online status query frame according to the preset query period; The acquisition slave unit receives the online status query frame, and if the reception is successful, it uploads a status frame; The communication host receives the status return frame of the acquisition slave unit, and if the reception is successful, the communication is normal.

6. The broadband power line carrier communication method applied to the outdoor monitoring system of the track circuit according to claim 5, characterized in that The acquisition slave unit sets a static period according to the configuration frame; After the networking configuration is successful, the acquisition slave uploads data frames according to the set static period.

7. A broadband power line carrier communication method applied to an outdoor monitoring system for track circuits according to claim 6, characterized in that the acquisition slave is further configured to upload data frames with a dynamic period, including: When the acquisition slave recognizes that the acquired data has changed suddenly, the acquisition slave immediately uploads a data frame and continuously uploads data frames multiple times according to a preset dynamic period.

8. An outdoor monitoring system for track circuits, characterized in that, The system includes indoor equipment and an outdoor transmission subsystem; The indoor equipment includes a communication host; The outdoor transmission subsystem includes a plurality of integrated outdoor transmission units. The outdoor transmission unit includes a box body and outdoor transmission equipment and outdoor monitoring equipment arranged in the box body. An internal partition structure for separating the outdoor transmission equipment and the outdoor monitoring equipment is arranged in the box body. The outdoor monitoring equipment includes an acquisition slave; The communication between the communication host and the acquisition slave adopts the broadband power line carrier communication method applied to the outdoor monitoring system for track circuits according to any one of claims 1-7.

9. A computer-readable storage medium storing one or more programs, characterized in that when the one or more programs are executed, the broadband power line carrier communication method applied to the outdoor monitoring system for track circuits according to any one of claims 1-7 can be implemented.

10. An electronic device, comprising a processor, a communication interface, the computer-readable storage medium according to claim 9, and a communication bus; wherein, The communication among the processor, the communication interface, and the computer-readable storage medium through the communication bus; characterized in that the processor is used to execute the program stored in the computer-readable storage medium.

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