Track circuit system and working method based on optical communication

Abstract

The present application relates to a track circuit system based on optical communication and a working method. The method is applied to a track circuit system based on optical fiber communication, the system includes an indoor communication host, an outdoor sending unit and an outdoor receiving unit, the indoor communication host is respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication, the method includes: the indoor communication host receives the coded signal sent by the train control system, sends the coded signal to the outdoor sending unit by optical communication, the outdoor sending unit receives the coded signal to generate a corresponding audio signal, sends the audio signal to the rails of the track circuit system, the outdoor receiving unit receives the audio signal from the rails of the track circuit system, generates track occupancy information according to the audio signal, and sends the track occupancy information to the indoor communication host by optical communication. The present application transmits the coded signal by optical communication, so that the track circuit has low power consumption, a small number of cables and eliminates interference caused by cable coupling.

Description

Technical Field

[0001] The present application relates to the field of track circuit technology, and in particular to a track circuit system and working method based on optical communication. Background Art

[0002] At present, ZPW2000 track circuit is one of the most widely used signal equipment in railways. Its main function is to transmit control signals to locomotives through audio circuits.

[0003] The working steps of the existing ZPW2000 track circuit are as follows:

[0004] 1. The transmitter generates corresponding signals according to the control information sent by the train control system, and the signals are amplified and sent to the cable simulation network disk;

[0005] 2. The analog network disk output is sent to the transformer via cable, and the transformer converts the signal into low voltage and transmits it to the track;

[0006] 3. On the other side of the track section, the voltage is received from both sides of the track, boosted by a matching transformer, and then sent back to the indoor cable simulation network disk through cables;

[0007] 4. After the analog network disk output is sent via cable to the attenuator for filtering and then transmitted to the receiver, the track occupancy status is output.

[0008] The existing track circuits have the following problems: the large number of circuits leads to a large amount of construction work, the track circuits have high power consumption and the direct interference between the track circuits is large, the track circuits are repeatedly stepped up and down to reduce transmission losses, and an analog network disk is added to maintain the consistency of the circuits, resulting in a high degree of circuit complexity, which increases the number of points where the circuits may fail. Summary of the invention

[0009] In view of the above, the present application provides a track circuit system and working method based on optical communication, the purpose of which is to solve the above technical problems.

[0010] In a first aspect, the present application provides a track circuit working method based on optical communication, the method is applied to a track circuit system based on optical fiber communication, the system includes an indoor communication host, an outdoor sending unit and an outdoor receiving unit, the indoor communication host is respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication, the method includes:

[0011] The indoor communication host receives the coded signal sent by the train control system, and sends the coded signal to the outdoor sending unit in an optical communication manner;

[0012] The outdoor sending unit receives the coded signal to generate a corresponding audio signal, and sends the audio signal to the rail of the system;

[0013] The outdoor receiving unit receives the audio signal from the rail, generates track occupancy information according to the audio signal, and sends the track occupancy information to the indoor communication host in an optical communication manner.

[0014] In a second aspect, the present application provides a track circuit system based on optical fiber communication, the system comprising: an indoor communication host, an outdoor sending unit and an outdoor receiving unit, the indoor communication host being respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication;

[0015] The indoor communication host is used to receive the coded signal sent by the train control system, and send the coded signal to the outdoor sending unit by optical communication; and to receive the track occupancy information sent by the outdoor receiving unit by optical communication;

[0016] The outdoor sending unit is used to receive the coded signal to generate a corresponding audio signal, and send the audio signal to the rail of the system;

[0017] The outdoor receiving unit is used to receive the audio signal from the rail, generate track occupancy information according to the audio signal, and send the track occupancy information to the indoor communication host in an optical communication manner.

[0018] In a third aspect, the present application provides an indoor communication host, the indoor communication host comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0019] Memory, used to store computer programs;

[0020] The processor is used to implement the following steps when executing the program stored in the memory:

[0021] receiving a coded signal sent by a train control system, and sending the coded signal to an outdoor sending unit in an optical communication manner, so that the outdoor sending unit generates an audio signal according to the coded signal and the outdoor receiving unit generates track occupancy information according to the audio signal;

[0022] receiving the track occupancy information sent by the outdoor receiving unit using an optical communication method;

[0023] The track occupancy information is sent to the train control system in an optical communication manner.

[0024] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0025] receiving a coded signal sent by a train control system, and sending the coded signal to an outdoor sending unit in an optical communication manner, so that the outdoor sending unit generates an audio signal according to the coded signal and the outdoor receiving unit generates track occupancy information according to the audio signal;

[0026] receiving the track occupancy information sent by the outdoor receiving unit using an optical communication method;

[0027] The track occupancy information is sent to the train control system in an optical communication manner.

[0028] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0029] This application transmits coded signals through optical communication, which reduces the number of cables and the amount of construction. Compared with the existing technology that uses high-voltage signal transmission, the optical signal transmission greatly reduces line losses, reduces the pair of step-up and step-down transformers for sending and receiving in the existing technology, eliminates interference caused by cable coupling, reduces the complexity of the track circuit, and can break through the original ZPW2000 equipment's 10-kilometer transmission distance, which can reduce or even eliminate relay stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a flowchart diagram of a preferred embodiment of the track circuit working method based on optical communication of the present application;

[0033] Figure 2 A schematic diagram of a track circuit system based on optical fiber communication in this application;

[0034] Figure 3 A schematic diagram of a preferred embodiment of the indoor communication host of the present application;

[0035] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0037] The present application provides a track circuit working method based on optical communication. Figure 1 The figure is a method flow diagram of an embodiment of the track circuit working method based on optical communication of the present application. The method is applied to a track circuit system based on optical fiber communication, the system includes an indoor communication host, an outdoor sending unit and an outdoor receiving unit, the indoor communication host is respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication, and the track circuit working method based on optical communication includes:

[0038] Step S10: the indoor communication host receives the coded signal sent by the train control system, and sends the coded signal to the outdoor sending unit in an optical communication manner;

[0039] Step S20: the outdoor sending unit receives the coded signal to generate a corresponding audio signal, and sends the audio signal to the rail of the system;

[0040] Step S30: the outdoor receiving unit receives the audio signal from the rail, generates track occupancy information according to the audio signal, and sends the track occupancy information to the indoor communication host in an optical communication manner.

[0041] In this embodiment, the indoor communication host receives the coded signal of the track sent by the train control system (for example, the carrier frequency coded signal), and sends the coded signal to the outdoor sending unit by optical communication. Specifically, the coded signal is converted into an Ethernet signal, and the Ethernet signal is converted into an optical signal by a switch, and the optical signal is sent to the outdoor sending unit by optical communication (for example, an optical fiber network). By transmitting the coded signal by optical communication, compared with the prior art method of using high-voltage signal transmission, the present application greatly reduces the line loss, reduces the pair of step-up and step-down transformers for sending and receiving in the prior art, eliminates the interference caused by cable coupling, and can break through the original ZPW2000 device's 10-kilometer transmission distance, and can reduce or even eliminate relay stations.

[0042] The outdoor sending unit receives the coded signal to generate a corresponding audio signal, and sends the audio signal to the rails of the track circuit system. Specifically, after receiving the coded signal, the outdoor sending unit generates an audio signal (i.e., an audio voltage signal) of a corresponding waveform, and sends it to the track (rail) using a steel-clad copper wire cable through a signal matching transformer. The generated waveform follows the existing railway ZPW2000 standard. For example, when the carrier frequency coding signal sent by the indoor communication host is 0x01, it means that a carrier frequency signal of 1701.4Hz is sent. When the low-frequency coding signal sent by the indoor communication host is 0x36, it means that the low frequency of the signal is 10.3Hz, and the signal modulation depth is fixed at 11Hz. When illegal coding information is received, a low-frequency code of 29.0 is sent to ensure driving safety.

[0043] The outdoor receiving unit receives an audio signal from the rails of the track circuit system, generates track occupancy information according to the audio signal, and sends the track occupancy information to the indoor communication host by optical communication. Specifically, the outdoor receiving unit receives the audio voltage signal on the rail after being stepped up by the receiving transformer, decodes the signal and calculates the corresponding track signal amplitude, determines whether there is a train occupying the track according to the track signal amplitude, and sends the track signal amplitude, coded signal and track occupancy information to the indoor communication host by optical communication. Further, the generation of track occupancy information according to the audio signal includes:

[0044] Decoding the audio signal, and calculating the track signal amplitude according to the decoding result;

[0045] determining a train occupancy state of the track according to the track signal amplitude;

[0046] The track occupancy information is generated according to the train occupancy status.

[0047] After decoding the audio signal, the ZFFT algorithm is used to calculate the corresponding track signal amplitude. The train occupancy status of the track is determined based on the preset threshold and track signal amplitude. The threshold can be set according to the actual scenario and is not limited here. When the track signal amplitude is less than the preset threshold, the track is determined to be in an occupied state, otherwise it is determined to be in an adjustment state, and the track occupancy information is generated based on the train occupancy status.

[0048] In one embodiment, the indoor communication host sends the track occupancy information to the train control system.

[0049] The indoor communication host can send the track occupancy information and carrier frequency coding information to the train control system in the agreed format, so that the train control host can perform code control according to the track occupancy information.

[0050] In one embodiment, the method also includes: the outdoor sending unit reports the voltage value and current value of the sending circuit corresponding to the outdoor sending unit to the indoor communication host, and the outdoor receiving unit reports the voltage value and current value of the receiving circuit corresponding to the outdoor receiving unit to the indoor communication host.

[0051] In addition to transmitting the track coding signal to the indoor communication host, the outdoor sending unit and the outdoor receiving unit can also actively report the voltage and current values ​​of the sending circuit, as well as the working status information of the equipment corresponding to the outdoor sending unit.

[0052] The outdoor receiving unit can also actively report the voltage value and current value of the receiving circuit, as well as the working status information of the device corresponding to the outdoor receiving unit, so as to achieve the purpose of device self-diagnosis.

[0053] Reference Figure 2 Shown is a schematic diagram of the track circuit system based on optical fiber communication of the present application.

[0054] The track circuit system based on optical fiber communication includes: an indoor communication host, an outdoor sending unit and an outdoor receiving unit, and the indoor communication host is respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication;

[0055] The indoor communication host is used to receive the coded signal sent by the train control system, and send the coded signal to the outdoor sending unit by optical communication; and to receive the track occupancy information sent by the outdoor receiving unit by optical communication;

[0056] The outdoor sending unit is used to receive the coded signal to generate a corresponding audio signal, and send the audio signal to the outdoor receiving unit;

[0057] The outdoor receiving unit is used to receive the audio signal, generate track occupancy information according to the audio signal, and send the track occupancy information to the indoor communication host in an optical communication manner.

[0058] In this embodiment, the train control system is connected to the indoor communication host. It can be understood that there can be multiple indoor communication hosts. The indoor communication host is connected to the outdoor sending unit and the outdoor receiving unit through the optical fiber network. The outdoor sending unit includes an outdoor code generator, a switching unit and a matching transformer. The matching transformer is used to convert the signal into a low-voltage signal and transmit it to the track circuit. The matching transformer of the outdoor sending unit is connected to the track circuit. The outdoor receiving unit includes an outdoor receiver and a matching transformer. The matching transformer is used to boost the low-voltage signal of the track circuit and transmit it to the outdoor receiver. The matching transformer of the outdoor receiving unit is connected to the track circuit. By using digital optical signals for transmission, data interference can be reduced, and the deployment of cables can be reduced.

[0059] In one embodiment, the indoor communication host is also used to send the track occupancy information to the train control system.

[0060] In one embodiment, the outdoor sending unit is further used to report the voltage value and current value of the sending circuit corresponding to the outdoor sending unit to the indoor communication host.

[0061] In one embodiment, the outdoor receiving unit is further used to report the voltage value and current value of the receiving circuit corresponding to the outdoor receiving unit to the indoor communication host.

[0062] In one embodiment, the step of sending the coded signal to an outdoor sending unit in an optical communication manner includes:

[0063] Converting the encoded signal into an Ethernet signal;

[0064] Converting the Ethernet signal into an optical signal using a switch;

[0065] The optical signal is sent to an outdoor sending unit by optical communication.

[0066] In one embodiment, generating track occupancy information according to the audio signal includes:

[0067] Decoding the audio signal, and calculating the track signal amplitude according to the decoding result;

[0068] determining a train occupancy state of the track according to the track signal amplitude;

[0069] The track occupancy information is generated according to the train occupancy status.

[0070] like Figure 3 As shown, an embodiment of the present application provides an indoor communication host, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114, and the memory 113 is used to store computer programs;

[0071] In one embodiment of the present application, the processor 111, when used to execute the program stored in the memory 113, implements the following steps:

[0072] receiving a coded signal sent by a train control system, and sending the coded signal to an outdoor sending unit in an optical communication manner, so that the outdoor sending unit generates an audio signal according to the coded signal and the outdoor receiving unit generates track occupancy information according to the audio signal;

[0073] receiving the track occupancy information sent by the outdoor receiving unit using an optical communication method;

[0074] The track occupancy information is sent to an indoor communication host by optical communication.

[0075] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0076] receiving a coded signal sent by a train control system, and sending the coded signal to an outdoor sending unit in an optical communication manner, so that the outdoor sending unit generates an audio signal according to the coded signal and the outdoor receiving unit generates track occupancy information according to the audio signal;

[0077] receiving the track occupancy information sent by the outdoor receiving unit using an optical communication method;

[0078] The track occupancy information is sent to an indoor communication host by optical communication.

[0079] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A track circuit working method based on optical communication, applied to a track circuit system based on optical fiber communication, characterized in that: The system comprises an indoor communication host, an outdoor sending unit and an outdoor receiving unit, wherein the indoor communication host is respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication, and the method comprises: The indoor communication host receives the coded signal sent by the train control system, and sends the coded signal to the outdoor sending unit in an optical communication manner; The outdoor sending unit receives the coded signal to generate a corresponding audio signal, and sends the audio signal to the rail of the system; The outdoor receiving unit receives the audio signal from the rail, generates track occupancy information according to the audio signal, and sends the track occupancy information to the indoor communication host in an optical communication manner; The step of generating track occupancy information according to the audio signal includes: Decoding the audio signal, and calculating the track signal amplitude according to the decoding result; determining a train occupancy state of the track according to the track signal amplitude; The track occupancy information is generated according to the train occupancy status.

2. The track circuit working method based on optical communication according to claim 1, characterized in that: The method further comprises: The indoor communication host sends the track occupancy information to the train control system.

3. The track circuit working method based on optical communication according to claim 1, characterized in that: The method further comprises: The outdoor sending unit reports the voltage value and the current value of the sending circuit corresponding to the outdoor sending unit to the indoor communication host.

4. The track circuit working method based on optical communication according to claim 1, characterized in that: The method further comprises: The outdoor receiving unit reports the voltage value and the current value of the receiving circuit corresponding to the outdoor receiving unit to the indoor communication host.

5. The track circuit working method based on optical communication according to claim 1, characterized in that: The step of sending the coded signal to an outdoor sending unit in an optical communication manner comprises: Converting the encoded signal into an Ethernet signal; Converting the Ethernet signal into an optical signal using a switch; The optical signal is sent to an outdoor sending unit by optical communication.

6. A track circuit system based on optical fiber communication, characterized in that: The system comprises: an indoor communication host, an outdoor sending unit and an outdoor receiving unit, wherein the indoor communication host is respectively connected to the outdoor sending unit and the outdoor receiving unit by optical communication; The indoor communication host is used to receive the coded signal sent by the train control system, and send the coded signal to the outdoor sending unit by optical communication; and to receive the track occupancy information sent by the outdoor receiving unit by optical communication; The outdoor sending unit is used to receive the coded signal to generate a corresponding audio signal, and send the audio signal to the rail of the system; The outdoor receiving unit is used to receive the audio signal from the rail, generate track occupancy information according to the audio signal, and send the track occupancy information to the indoor communication host in an optical communication manner; The step of generating track occupancy information according to the audio signal includes: Decoding the audio signal, and calculating the track signal amplitude according to the decoding result; determining a train occupancy state of the track according to the track signal amplitude; The track occupancy information is generated according to the train occupancy status.

7. The track circuit system based on optical fiber communication as claimed in claim 6, characterized in that: The indoor communication host is also used to send the track occupancy information to the train control system.

8. An indoor communication host, characterized in that: The indoor communication host comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory, used to store computer programs; The processor is used to implement the following steps when executing the program stored in the memory: receiving a coded signal sent by a train control system, and sending the coded signal to an outdoor sending unit in an optical communication manner, so that the outdoor sending unit generates an audio signal according to the coded signal and the outdoor receiving unit generates track occupancy information according to the audio signal; receiving the track occupancy information sent by the outdoor receiving unit using an optical communication method; Sending the track occupancy information to the train control system in an optical communication manner; The step of generating track occupancy information according to the audio signal includes: Decoding the audio signal, and calculating the track signal amplitude according to the decoding result; determining a train occupancy state of the track according to the track signal amplitude; The track occupancy information is generated according to the train occupancy status.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the following steps are implemented: receiving a coded signal sent by a train control system, and sending the coded signal to an outdoor sending unit in an optical communication manner, so that the outdoor sending unit generates an audio signal according to the coded signal and the outdoor receiving unit generates track occupancy information according to the audio signal; receiving the track occupancy information sent by the outdoor receiving unit using an optical communication method; Sending the track occupancy information to the train control system in an optical communication manner; The step of generating track occupancy information according to the audio signal includes: Decoding the audio signal, and calculating the track signal amplitude according to the decoding result; determining a train occupancy state of the track according to the track signal amplitude; The track occupancy information is generated according to the train occupancy status.

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