CN113859323B - New generation photoelectric composite transponder transmission system - Google Patents
New generation photoelectric composite transponder transmission system Download PDFInfo
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- CN113859323B CN113859323B CN202110943808.3A CN202110943808A CN113859323B CN 113859323 B CN113859323 B CN 113859323B CN 202110943808 A CN202110943808 A CN 202110943808A CN 113859323 B CN113859323 B CN 113859323B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
Abstract
The application relates to a rail transit transponder transmission system, and provides a brand new generation photoelectric composite transponder transmission system, which comprises vehicle-mounted equipment and ground equipment, and is characterized in that the ground equipment comprises a photoelectric composite active transponder and a photoelectric composite ground electronic unit; the one or more photoelectric composite active transponders are connected with the photoelectric composite ground electronic unit through a photoelectric composite cable, and the photoelectric composite ground electronic unit and the column control center are in optical fiber communication. Aiming at the defects of the ground equipment of the traditional transponder transmission system, the application adopts optical fiber interfaces for message transmission among the photoelectric composite ground electronic unit (O/E-LEU), the Train Control Center (TCC) and the photoelectric composite active transponder, and has the characteristics of long transmission distance, low transmission delay, strong anti-interference capability and full duplex communication.
Description
Technical Field
The application relates to a ground device in a rail transit transponder transmission system.
Background
The rail transit system has important functions on daily travel and cargo transportation of people and also faces a plurality of potential safety hazards. The transponder transmission system is an indispensable safety guarantee measure for a rail transit system, and is used for train transmission line characteristics such as gradient, turning radius, inclination angle and the like of a train, temporary speed limit information, station access information, positioning information and other information which must be known by a train control system.
The transponder transmission system is a ground-to-train transmission system (shown in fig. 1) based on the electromagnetic coupling principle, and is used for transmitting information from the ground to the train at a specific place, and can send message information to the vehicle subsystem, and can transmit fixed information or can connect with a trackside unit to transmit variable information. The surface equipment in the transponder transmission system comprises a transponder and a surface electronics unit (LEU for short).
Transponders in transponder transmission systems are classified into passive transponders and active transponders. The passive transponder is not required to be powered and is used for transmitting fixed information stored in the transponder; whereas existing active transponders require connection to a surface electronics unit (LEU) via a dedicated high frequency twisted pair shielded cable, which is powered by the surface electronics unit (LEU) and provides variable transponder messages that need to be transmitted. The existing active transponder circuit configuration is shown in fig. 2 as including a C-interface portion, an a-interface portion, and a memory and control module. Wherein, the C interface part is connected with a ground electronic unit (LEU) and receives a power supply signal and a message baseband signal of the ground electronic unit (LEU). The power supply signal and the message baseband signal of the ground electronics unit (LEU) are coupled for transmission over a pair of differential lines to the active transponder. In an active transponder, the memory unit mainly stores some fixed message information which will be sent when a ground electronic unit (LEU) fails to connect with the active transponder. In the active transponder, the control module is responsible for selecting the message to be sent.
The ground electronic unit (LEU) in the ground equipment of the transponder transmission system is a data acquisition and processing unit, the ground electronic unit (LEU) is an important component in the whole transponder transmission system, one message stored in the ground electronic unit (LEU) is selected to be transmitted to a ground active transponder for transmission according to the change of external conditions, or a transponder message transmitted by a Train Control Center (TCC) is directly transmitted to the active transponder, and the system block diagram of the existing ground electronic unit (LEU) is shown in figure 3, and the main functions are as follows:
(1) Message reception
The input channel and the interface unit adopt a redundancy mechanism, double sets of the input channel and the interface unit work simultaneously, and even if one channel or the interface circuit fails, the communication between the ground electronic unit (LEU) and the Train Control Center (TCC) is not affected.
The microprocessor periodically receives messages from a Train Control Center (TCC) through a communication interface, and transmits the messages to a logic control unit, and the logic control unit changes the periodic messages into continuous message output. If the channel fails or the ground electronics unit (LEU) fails, the microprocessor cannot receive the correct Train Control Center (TCC) message, and at this point, a corresponding default message is selected from the message memory and sent to the logic control unit.
In addition, the security communication protocol is adopted to ensure the reliability of communication, and besides common coding, frame structure definition and CRC check, the method has the greatest characteristic of introducing a time stamp concept, thereby ensuring the correctness, instantaneity, completeness and information sequence of communication information.
(2) Logic control unit
After receiving the message, the microprocessor dumps the message in the logic control unit, which corresponds to a sending buffer, and circularly outputs the message (such as 1023-bit message) at a rate of 564.48 kbps. The logic control unit generates 8.82KHz sine wave power supply signals required by the C6 interface besides outputting message data.
(3) Power amplification
Since the packet data signal C1 defined by the C interface and the interface power supply signal C6 are very different in frequency, power amplification is required respectively. The amplified C1 and C6 signals are coupled into a transformer, thereby enabling both signals to be transmitted over a pair of transmission lines.
In summary, the existing ground equipment of the transponder transmission system has the following disadvantages:
(1) The cable connecting the ground electronic unit (LEU) and the active transponder is a special high-frequency twisted pair shielding cable, which has the advantages of high price, short reliable transmission distance (the maximum requirement of the national railway industry standard TB/T3485-2017 of the people's republic of China is not more than 2.5 km), low transmission rate (564.48 kbps) and large message transmission delay.
(2) The Train Control Center (TCC) sends the message information to the ground electronic unit (LEU) through a communication interface (RS 485/422 serial interface), the serial interface has low speed (38.4 kbps) and the message transmission delay is large.
(3) Is easy to be interfered by lightning, and the external electromagnetic interference can influence the signal quality of the message baseband.
(4) The ground electronic unit (LEU) couples the amplified power supply signal and the message signal to the special high-frequency twisted pair shielded cable for transmission, so that the message signal is interfered by the power supply signal, and the reliability of system transmission is reduced. Because the frequency (8.82 kHz) of the power supply signal falls in the frequency band (564.48 kHz) of the message baseband signal, the band-pass filter for filtering the power supply signal also filters part of the message baseband signal, and the DBPL decoding accuracy is reduced.
(5) Since a single ground electronics unit (LEU) is typically connected to multiple active transponder units of different distances, the quality of the signals received by the multiple active transponders are less consistent. The active transponder close to the receiver has good received signal, and the active transponder far from the receiver has poor received signal.
(6) The ground electronic unit (LEU) can only detect whether the cable line is faulty or not, and the ground electronic unit (LEU) is not informed if the active transponder receives the message correctly or not.
Disclosure of Invention
The application aims to overcome the defects of the prior art and develops a new generation of photoelectric composite transponder transmission system.
The technical scheme of the application is as follows:
the novel generation photoelectric composite transponder transmission system comprises vehicle-mounted equipment, ground equipment and a train control center, wherein the vehicle-mounted equipment and the train control center are communicated through the ground equipment; the one or more photoelectric composite active transponders are connected with the photoelectric composite ground electronic unit through a photoelectric composite cable, and the photoelectric composite ground electronic unit and the column control center are in optical fiber communication.
A first part: photoelectric composite active transponder
The photoelectric composite active transponder comprises an A interface part, an O/E interface part, a manufacturing information storage, a message storage and a transponder control module. The A interface part, the message storage and the transponder control module and the functional relation between the A interface part and the transponder control module all adopt the prior art, wherein the A interface part comprises a coupling coil, a filtering protection, a 27M high-frequency receiving filter, data receiving and transmitting and an A interface working power supply.
The O/E interface portion includes: the system comprises an EMC protection module, an O/E interface working power module, a GTP interface, a GTP peripheral interface circuit, an optical port data receiving and transmitting module, a data extraction module, a logic control module and a serial interface. The O/E interface part is externally connected with an optical-electrical composite cable which comprises a power line and an optical fiber.
The EMC protection module is connected with a power line of the photoelectric composite cable and used as input, the output of the EMC protection module is connected with the O/E interface working power supply module, and the O/E interface working power supply module supplies power for the whole O/E interface part circuit.
The optical fiber in the photoelectric composite cable is connected with the GTP interface through a GTP peripheral interface circuit and then connected to the data extraction module through an input/output data line of the optical port data transceiver module.
Further, the optical port data transceiver module includes: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module, wherein the GTP RX module receives message data from a GTP interface, and transmits the message data to the opposite end through the GTP data return module and the GTP TX module for further processing.
The GTP interface is connected with the optical fiber through a GTP peripheral interface circuit.
The data extraction module comprises three sub-modules: the system comprises a frame verification module, a message decoding module and a differential Manchester encoding waveform output module, wherein:
and the frame checking module completes message checking and checks the correctness of the message.
The message decoding module executes a message decoding function and comprises three sub-modules: the device comprises a bit checking module, a code word generating module and a decoding output module. Firstly, a bit checking module checks whether the control bit and the additional bit of the message are correct or not; then, a codeword generation module completes codeword conversion from 10 bits to 11 bits to generate a new codeword; the decoding output module outputs the code word obtained by decoding to the differential Manchester encoding waveform output module.
The differential Manchester encoded waveform output module performs differential Manchester encoding and outputs a waveform to a serial interface.
The logic control module is used for respectively carrying out logic control on the optical port data receiving and transmitting module, the data extraction module and the serial interface according to the operation instruction, wherein the main content of the logic control comprises enabling, resetting, synchronizing and the like.
A second part: photoelectric composite ground electronic unit (O/E-LEU)
The photoelectric composite ground electronic unit (O/E-LEU) comprises seven functional modules, namely an optical signal receiving and transmitting original message module, a logic control and coding module, an optical signal receiving and transmitting coded message module, a program storage module, a message storage module, a detection recording module and a power supply module.
The optical signal receiving and transmitting original message module comprises: and the optical communication interface and the optical port data receiving and transmitting module I.
The optical communication interface includes: GTP interface, GTP interface peripheral circuitry. The optical communication interface is used for completing the conversion of photoelectric signals, and is the prior art. The GTP interface may also be replaced by a higher rate GTX interface, a GTH interface, or a GTZ interface. The optical communication interfaces are provided with two identical interfaces, so that the main and standby redundancy configuration is realized.
The first optical port data transceiver module comprises: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module. The GTP RX module receives message data from a GTP interface, and transmits the message data to the GTP data storage module for storage, and the message data is transmitted back to a Train Control Center (TCC) through the GTP data back-transmission module and the GTP TX module, and meanwhile, the message data is transmitted to the logic control and coding module for further processing.
The logic control and coding module comprises: the system comprises a logic control module, a DBPL coding module (differential biphase level code) and an 8.82KHz sine wave generation module; the logic control module judges the corresponding target photoelectric composite active transponder according to the message information received by the optical signal receiving and transmitting original message module, then controls the DBPL coding module to code the message data, and finally transmits the coded message data to the optical port data receiving and transmitting module II corresponding to the target photoelectric composite active transponder. The DBPL coding module is responsible for coding message data. The 8.82KHz sine wave generation module generates an 8.82KHz sine wave signal, and the sine wave signal is amplified by the power amplification module and then connected with a power line in the photoelectric composite cable to supply power to the photoelectric composite active transponder.
The optical signal receiving and transmitting coding message module realizes optical signal transmission between the O/E-LEU and the photoelectric composite active transponder. Comprising the following steps: and the optical port data receiving and transmitting module II and the optical communication interface. The second optical port data transceiver module comprises: the GTPRX module, the GTP TX module, the GTP receiving data storage module and the GTP sending data storage module. The GTP RX module and the GTP TX module are connected with a GTP interface in the optical communication interface, the output of the GTP RX module is connected with the GTP receiving data storage module, and the output of the GTP transmitting data storage module is connected with the GTP TX module. The optical signal receiving and transmitting coding message module is connected with the optical fiber in the photoelectric composite cable and is communicated with the photoelectric composite active transponder.
The program storage module is a memory chip and is used for storing programs operated by an optoelectronic composite ground electronic unit (O/E-LEU).
The message storage module is a memory chip and is used for storing default message information sent to the photoelectric composite active transponder by the O/E-LEU.
The detection recording module is a memory chip and is used for storing the detection result data of the O/E-LEU system state. The detection record data is transmitted back to a Train Control Center (TCC) through an optical port data transceiver module.
The power module provides working power for the O/E-LEU system.
The communication process comprises the following steps:
step (1) communication between the LEU and the active transponder:
step (11), the power supply signal provided by the LEU to the active transponder is transmitted by a power line in the photoelectric composite cable, and the message signal transmitted by the LEU to the active transponder is transmitted by an optical fiber in the photoelectric composite cable, so that the independent transmission of the power supply signal and the message signal between the LEU and the active transponder is realized, the bidirectional transmission from a Train Control Center (TCC) to the LEU to the active transponder is realized, and all the LEU to the active transponder are in optical fiber bidirectional transmission;
step (12), the Train Control Center (TCC) performs optical fiber communication process from the LEU to the active transponder:
step (121), the Train Control Center (TCC) transmits the original report Wen Guang signal to the LEU through the optical fiber; typically, the LEU is connected to a plurality of active transponders, and each original message is sent to one of the target active transponders;
step (122), the LEU converts the received original report Wen Guang signal into an electric signal, codes according to the coding mode required by the national railway industry standard TB/T3485-2017 of the people's republic of China, converts the electric signal into a coded report Wen Guang signal, and transmits the coded report Wen Guang signal to a target active transponder through an optical-electrical composite cable;
step (123), the target active transponder converts the received coded report Wen Guang signal into an electrical signal for processing;
after the improvement, the reliability of system transmission and the consistency of the received signal quality of a plurality of active transponders are improved, so that the message transmission delay is reduced, and the anti-interference capability and reliability of transmission are improved.
Step 2, full duplex fiber optic communication of the Train Control Center (TCC) to the active transponder via the LEU:
step (21), the Train Control Center (TCC) and the LEU, wherein the LEU and the active transponder are communicated by adopting a receiving and transmitting full duplex optical fiber, so that a feedback channel from the active transponder to the LEU and the Train Control Center (TCC) is introduced;
step (22), the active transponders feed back information to a Train Control Center (TCC) through a feedback communication process from the LEU to the TCC;
step (221), each active transponder encodes the electrical signal, converts the signal into a signal and transmits the signal back to the LEU;
step (222), the LEU converts the received optical signals into electrical signals, and the electrical signals are converted into optical signals after being received correctly and transmitted back to a Train Control Center (TCC);
step (223), the Train Control Center (TCC) converts the received optical signal into an electric signal, decodes and recovers the feedback information, and completes communication;
and (23) returning the information such as the message confirmation information received by the active transponder, the state sensing information of the next generation novel active transponder, the message and confirmation issued by the vehicle-mounted equipment and the like by utilizing a feedback channel, so that a Train Control Center (TCC) can grasp the LEU and the relevant state information of the active transponder in real time.
The system of the application, by reforming ground equipment, specifically: the improved LEU is connected with the improved active transponder by adopting an optical-electrical composite cable, so that Gbps full-duplex high-speed optical transmission is realized, and data message transmission between the improved LEU (namely an optical-electrical composite ground electronic unit (O/E-LEU)) and a Train Control Center (TCC) and data message transmission between the improved active transponder (namely the optical-electrical composite active transponder) are realized by adopting full-duplex optical fiber communication, so that a new generation of optical-electrical composite transponder transmission system can be constructed to replace a traditional rail transit transponder transmission system.
Drawings
FIG. 1 is a schematic diagram of a generic model of a transponder transmission system
FIG. 2 is a block diagram of a prior art active transponder system
FIG. 3 is a block diagram of an existing ground electronics unit (LEU) system
FIG. 4 is a block diagram of an optoelectronic composite active transponder system of the present application
FIG. 5 is a block diagram of an optical-electrical transceiver and signal processing circuit of an O/E interface portion of the present application
FIG. 6 is a block diagram of an optoelectronic composite ground electronics unit (O/E-LEU) system of the present application
FIG. 7 is a block diagram of an optoelectronic composite ground electronics unit (O/E-LEU) system of the present application
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The novel-generation photoelectric composite transponder transmission system comprises vehicle-mounted equipment, ground equipment and a train control center, wherein the vehicle-mounted equipment and the train control center are communicated through the ground equipment, and the ground equipment comprises a photoelectric composite active transponder and a photoelectric composite ground electronic unit; the one or more photoelectric composite active transponders are connected with the photoelectric composite ground electronic unit through a photoelectric composite cable, and the photoelectric composite ground electronic unit and the column control center are in optical fiber communication. The specific scheme is to reform on the basis of the ground equipment of the existing transponder transmission system, and comprises a reform photoelectric composite active transponder (see fig. 4 and 5) and a reform photoelectric composite ground electronic unit (O/E-LEU) (see fig. 6 and 7).
An optoelectric composite active transponder and an optoelectric composite ground electronics unit (O/E-LEU), in particular by two parts.
A first part: photoelectric composite active transponder
As shown in FIG. 4, a block diagram of the photoelectric composite active transponder according to the present application includes an A interface portion, an O/E interface portion, a manufacturing information store, a message store, and a transponder control module. The A interface part, the message storage and the transponder control module and the functional relation between the A interface part and the transponder control module all adopt the prior art, wherein the A interface part comprises a coupling coil, a filtering protection, a 27M high-frequency receiving filter, data receiving and transmitting and an A interface working power supply.
The O/E interface part is an innovation part of the application and comprises: the system comprises an EMC protection module, an O/E interface working power module, a GTP interface, a GTP peripheral interface circuit, an optical port data receiving and transmitting module, a data extraction module, a logic control module and a serial interface. By way of example, and not limitation, in this embodiment, the O/E interface portion is implemented with an FPGA. The O/E interface part is externally connected with an optical-electrical composite cable which comprises a power line and an optical fiber.
The EMC protection module is connected with a power line of the photoelectric composite cable and used as input, the output of the EMC protection module is connected with the O/E interface working power supply module, and the O/E interface working power supply module supplies power for the whole O/E interface part circuit.
The optical fiber in the photoelectric composite cable is connected with the GTP interface through a GTP peripheral interface circuit and then connected to the data extraction module through an input/output data line of the optical port data transceiver module.
Further, as shown in fig. 5, the optical port data transceiver module includes: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module, wherein the GTP RX module receives message data from a GTP interface, and transmits the message data to the opposite end through the GTP data return module and the GTP TX module for further processing. And (3) injection: in order to fully exert the advantage of high capacity of optical fiber transmission, the GTP data returning module returns not only the message stored in the GTP data storage module, but also the message data sent to the serial interface by the data extracting module and the necessary working state information of the active transponder.
The GTP interface is self-contained in the FPGA and is connected with the optical fiber interface through a GTP peripheral interface circuit. The peripheral GTP interface circuit is in the prior art, and can be replaced by optical interfaces such as GTX, GTH or GTZ.
The data extraction module comprises three sub-modules: the system comprises a frame verification module, a message decoding module and a differential Manchester encoding waveform output module, wherein:
and the frame checking module completes message checking and checks the correctness of the message.
The message decoding module executes a message decoding function and comprises three sub-modules: the device comprises a bit checking module, a code word generating module and a decoding output module. Firstly, a bit checking module checks whether the control bit and the additional bit of the message are correct or not; then, a codeword generation module completes codeword conversion from 10 bits to 11 bits to generate a new codeword; the decoding output module outputs the code word obtained by decoding to the differential Manchester encoding waveform output module.
The differential Manchester encoded waveform output module performs differential Manchester encoding and outputs a waveform to a serial interface.
The logic control module is used for respectively carrying out logic control on the optical port data receiving and transmitting module, the data extraction module and the serial interface according to the operation instruction, wherein the main content of the logic control comprises enabling, resetting, synchronizing and the like.
Through the circuit design, when the photoelectric composite ground electronic unit is applied, the O/E interface part is connected with the photoelectric composite ground electronic unit through the photoelectric composite cable, and receives a power supply signal and a message baseband signal of the photoelectric composite ground electronic unit. The power supply signal and the message baseband signal output by the photoelectric composite ground electronic unit are respectively and independently transmitted in the photoelectric composite cable through the power line and the optical fiber, and are not mutually influenced. After reaching the photoelectric composite active transponder, the following treatment is carried out: (1) Connecting a power line in an input photoelectric composite cable into an electromagnetic compatibility protection module (EMC) to prevent the input signal current voltage signal from being too large to damage the photoelectric composite active transponder equipment; then connecting to a working power supply module to form a stable O/E interface part working power supply; (2) The optical fiber in the input photoelectric composite cable is connected to a GTP interface, and then message data is received through an optical port data receiving and transmitting module; (3) The data extraction module is responsible for decoding received message data and recovering bit streams of original messages 0 and 1; (4) If the message data recovered by the data extraction module passes the verification, the photoelectric composite active transponder control module is informed of receiving a new message, and the message information (or correctly received message confirmation message) is reversely returned to the photoelectric composite ground electronic unit through the optical port data receiving and transmitting module, and the photoelectric composite ground electronic unit simultaneously transmits the received message information to a Train Control Center (TCC); otherwise, the receiving failure message is returned to the photoelectric composite ground electronic unit.
A second part: photoelectric composite ground electronic unit (O/E-LEU)
As shown in the block diagram of fig. 6, the photoelectric composite ground electronic unit (O/E-LEU) includes seven functional modules, namely an optical signal receiving and transmitting original message module, a logic control and coding module, an optical signal receiving and transmitting coded message module, a program storage module, a message storage module, a detection recording module and a power supply module. A circuit diagram of an implementation of an optical-electrical-composite-terrestrial electronics unit (O/E-LEU) system is shown in fig. 7.
The optical signal receiving and transmitting original message module comprises: and the optical communication interface and the optical port data receiving and transmitting module I. The optical port data transceiver module is innovative.
The optical communication interface includes: GTR interface, GTR interface peripheral circuit. The optical communication interface is used for completing the conversion of photoelectric signals, and is the prior art. The GTP interface may also be replaced by a higher rate GTX interface, a GTH interface, or a GTZ interface. The optical communication interfaces are provided with two identical interfaces, so that the main and standby redundancy configuration is realized.
The first optical port data transceiver module comprises: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module. The GTP RX module receives message data from a GTP interface, and transmits the message data to the GTP data storage module for storage, and the message data is transmitted back to a Train Control Center (TCC) through the GTP data back-transmission module and the GTP TX module, and meanwhile, the message data is transmitted to the logic control and coding module for further processing.
The logic control and coding module comprises: the system comprises a logic control module, a DBPL coding module (differential biphase level code) and an 8.82KHz sine wave generation module; the logic control module judges the corresponding target photoelectric composite active transponder according to the message information received by the optical signal receiving and transmitting original message module, then controls the DBPL coding module to code the message data, and finally transmits the coded message data to the optical port data receiving and transmitting module II corresponding to the target photoelectric composite active transponder. The DBPL coding module is responsible for coding message data, and a specific flow is given in the national railway industry standard TB/T3485-2017 of the people's republic of China. The 8.82KHz sine wave generation module generates an 8.82KHz sine wave signal, and the sine wave signal is amplified by the power amplification module and then connected with a power line in the photoelectric composite cable to supply power to the photoelectric composite active transponder.
The optical signal receiving and transmitting coding message module realizes optical signal transmission between an optical-electrical composite ground electronic unit (O/E-LEU) and an optical-electrical composite active transponder. Comprising the following steps: and the optical port data receiving and transmitting module II and the optical communication interface. The second optical port data transceiver module comprises: the system comprises a GTP RX module, a GTP TX module, a GTP receiving data storage module and a GTP transmitting data storage module. The GTP RX module and the GTP TX module are connected with a GTP interface in the optical communication interface, the output of the GTP RX module is connected with the GTP receiving data storage module, and the output of the GTP transmitting data storage module is connected with the GTP TX module. The optical signal receiving and transmitting coding message module is connected with the optical fiber in the photoelectric composite cable and is communicated with the photoelectric composite active transponder.
The program storage module is a memory chip and is used for storing programs operated by an optoelectronic composite ground electronic unit (O/E-LEU).
The message storage module is a memory chip and is used for storing default message information sent to the photoelectric composite active transponder by the photoelectric composite ground electronic unit (O/E-LEU).
The detection recording module is a memory chip and is used for storing the state detection result data of a photoelectric composite ground electronic unit (O/E-LEU) system. The detection record data is transmitted back to a Train Control Center (TCC) through an optical port data transceiver module.
The power module provides a working power supply for an optoelectronic composite ground electronic unit (O/E-LEU) system.
In an embodiment the O/E interface portion is implemented with an FPGA. For example, but not limited to, a dedicated optical port transceiver chip may be purchased to be implemented in combination with a microprocessor chip such as an ARM, DSP, etc., so as to replace the optical port data transceiver module in the embodiment that includes: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module, a GTP data return module, a logic control module, a frame check module, a message decoding module, a differential Manchester code waveform output module and a serial interface output.
In an embodiment, an FPGA is used to realize the O/E-LEU system. For example, but not limited to, a special optical port transceiver chip and a microprocessor chip such as ARM and DSP can be purchased to be combined for implementation, so as to replace an optical port data transceiver module I (comprising a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module), a logic control and coding module and an 8.82KHz sine wave generation module in the embodiment.
The special high-frequency twisted pair shielding cable is changed into the photoelectric composite cable, the photoelectric composite cable is low in price, small in size and long in service life, the optical fiber transmits message information, the optical fiber is insulated and not easy to damage by electromagnetic interference such as thunder and lightning, the transmission distance can reach hundreds of kilometers at maximum, and the laying range of the active transponder is greatly increased.
Compared with the prior art, the beneficial effects are that:
(1) The return loss of the optical fiber transmission performance can reach more than 50dB, the return loss of the special high-frequency twisted pair shielding cable required by the national railway industry standard TB/T3485-2017 of the people's republic of China is better than 6dB, and the quality of the received optical signal is better than the quality of the electrical signal.
(2) The transmission rate between a ground electronic unit (LEU) and the photoelectric composite active transponder is improved from the existing kbps to Gbps, and the message transmission delay is greatly reduced. Taking a typical 1023 bit message as an example, the transmission rate using a conventional 564.48kbps dedicated high frequency twisted pair shielded cable requires 1.8 milliseconds, while the transmission using a 1.25Gbps fiber requires only 0.8 microseconds.
(3) The special high-frequency twisted pair shielding cable is changed into the photoelectric composite cable, the photoelectric composite cable is low in price, small in size and long in service life, the optical fiber transmits message information, the optical fiber is insulated and not easy to damage by electromagnetic interference such as thunder and lightning, the transmission distance can reach hundreds of kilometers at maximum, and the laying range of the active transponder is greatly increased.
(4) By adopting the photoelectric composite cable transmission, the power supply signal of the ground electronic unit (LEU) is not coupled into the message baseband signal any more, and the influence of the power supply signal on the message baseband signal is effectively avoided.
(5) The full duplex communication transmits the successfully decoded message of the active transponder back to the ground electronic unit (LEU) in real time through the optical fiber, and transmits the successfully decoded message to the Train Control Center (TCC) through the ground electronic unit (LEU), so that the train control center and the ground electronic unit (LEU) can both confirm whether the message content transmitted to the photoelectric composite active transponder is correctly received in real time, and the reliability of message data transmission is improved.
The photoelectric composite ground electronic unit (O/E-LEU) modified by the application has the following advantages:
(1) The whole process from the Train Control Center (TCC) to the photoelectric composite ground electronic unit (O/E-LEU) to the active transponder adopts optical fibers to transmit message data, the return loss of the optical fibers transmission performance can reach more than 50dB, the return loss of the special high-frequency twisted pair shielded cable required by the national railway industry standard TB/T3485-2017 of the people's republic of China is greatly superior to the return loss of the special high-frequency twisted pair shielded cable, and the quality of the received optical signals is greatly superior to the quality of the electrical signals.
(2) The whole transmission rate from the Train Control Center (TCC) to the photoelectric composite ground electronic unit (O/E-LEU) to the active transponder is increased from kbps to Gbps, and the message transmission delay is greatly reduced. Taking a typical 1023 bit message as an example, a Train Control Center (TCC) to ground electronics unit (LEU) transmission using a conventional cable requires 26.6 milliseconds (38.4 kbps serial interface rate); the ground electronics unit then forwards the message to the active transponder, which requires 1.8 milliseconds (564.48 kbps serial interface rate) for transmission using a conventional dedicated high frequency twisted pair shielded cable. Whereas the present application proposes using fiber optic transmission (e.g., 1.25Gbps rate) only requires 0.8 microseconds.
(3) The special high-frequency twisted pair shielding cable is changed into the photoelectric composite cable, the photoelectric composite cable is low in price, small in size and long in service life, the optical fiber transmits message information, the optical fiber is insulated and not easy to damage by electromagnetic interference such as thunder and lightning, the transmission distance can reach hundreds of kilometers at maximum, and the laying range of the active transponder is greatly increased.
(4) By adopting the photoelectric composite cable transmission, the power supply signal of the photoelectric composite ground electronic unit (O/E-LEU) is not coupled into the message baseband signal any more, and the influence of the power supply signal on the message baseband signal is effectively avoided. The power supply signal can also be generated by other special power supply modules to supply power independently.
(5) Bidirectional communication acknowledgement mechanism: full duplex communication between the optoelectronic composite ground electronics unit (O/E-LEU) and the active transponder and full duplex communication between the optoelectronic composite ground electronics unit (O/E-LEU) and the Train Control Center (TCC). By adopting full duplex communication, bidirectional loop communication from a Train Control Center (TCC) to an optoelectronic composite ground electronic unit (O/E-LEU) and then to an active transponder is realized, so that whether the message content received by the active transponder is correct or not can be confirmed in real time by the Train Control Center (TCC) and the optoelectronic composite ground electronic unit (O/E-LEU), and the reliability of message transmission is improved.
In summary, the system of the application reforms the existing LEU and reforms the existing active transponder, adopts the photoelectric composite cable to connect, thus realize Gbps full duplex high-speed optical transmission, the data message transmission between the modified LEU (namely photoelectric composite ground electronic unit (O/E-LEU)) and the Train Control Center (TCC) and the modified active transponder (namely photoelectric composite active transponder) adopts full duplex optical fiber communication, construct a new generation photoelectric composite transponder transmission system, so as to replace the traditional rail transit transponder transmission system.
Claims (2)
1. The novel generation photoelectric composite transponder transmission system comprises vehicle-mounted equipment, ground equipment and a train control center, wherein the vehicle-mounted equipment and the train control center are communicated through the ground equipment; the one or more photoelectric composite active transponders are connected with the photoelectric composite ground electronic unit by a photoelectric composite cable, and the photoelectric composite ground electronic unit and the column control center are in optical fiber communication;
the photoelectric composite active transponder comprises an A interface part, an O/E interface part, a manufacturing information storage, a message storage and a transponder control module;
the O/E interface portion includes: the system comprises an EMC protection module, an O/E interface working power supply module, a GTP interface, a GTP peripheral interface circuit, an optical port data receiving and transmitting module, a data extraction module, a logic control module and a serial interface; the O/E interface part is externally connected with an optical-electrical composite cable which comprises a power line and an optical fiber;
the EMC protection module is connected with a power line in the photoelectric composite cable and used as input, the output of the EMC protection module is connected with the O/E interface working power supply module, and the O/E interface working power supply module supplies power for the whole O/E interface part circuit;
the optical fiber in the photoelectric composite cable is connected with the GTP interface through a GTP peripheral interface circuit and then is connected to the data extraction module through an input/output data line of the optical port data transceiver module;
further, the optical port data transceiver module includes: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module, wherein the GTP RX module receives message data from a GTP interface, and transmits the message data to the GTP data storage module for storage, and the message data is returned to the opposite end through the GTP data return module and the GTP TX module for communication, and meanwhile, the message data is transmitted to the data extraction module for further processing;
the GTP interface is connected with the optical fiber through a GTP peripheral interface circuit;
the data extraction module comprises three sub-modules: the system comprises a frame verification module, a message decoding module and a differential Manchester encoding waveform output module, wherein:
the frame checking module completes message checking and checks the correctness of the message;
the message decoding module executes a message decoding function and comprises three sub-modules: the device comprises a bit checking module, a code word generating module and a decoding output module; firstly, a bit checking module checks whether the control bit and the additional bit of the message are correct or not; then, a codeword generation module completes codeword conversion from 10 bits to 11 bits to generate a new codeword; the decoding output module outputs the code words obtained by decoding to the differential Manchester encoding waveform output module;
the differential Manchester encoding waveform output module performs differential Manchester encoding and outputs waveforms to a serial interface;
the logic control module is used for respectively carrying out logic control on the optical port data receiving and transmitting module, the data extraction module and the serial interface according to the operation instruction, wherein the main content of the logic control comprises enabling, resetting and synchronizing;
the photoelectric composite ground electronic unit comprises seven functional modules, namely an optical signal receiving and transmitting original message module, a logic control and encoding module, an optical signal receiving and transmitting encoding message module, a program storage module, a message storage module, a detection recording module and a power supply module;
the optical signal receiving and transmitting original message module comprises: an optical communication interface and an optical port data receiving and transmitting module I;
the optical communication interface includes: GTP interface, GTP interface peripheral circuitry; the optical communication interfaces are provided with two identical interfaces, so that main and standby redundancy configuration is realized;
the first optical port data transceiver module comprises: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data return module; the GTP RX module receives message data from a GTP interface, and transmits the message data to the GTP data storage module for storage, and the message data is transmitted back to the column control center through the GTP data back-transmission module and the GTP TX module, and meanwhile, the message data is transmitted to the logic control and coding module for further processing;
the logic control and coding module comprises: the system comprises a logic control module, a DBPL coding module and an 8.82KHz sine wave generation module; the logic control module firstly judges a corresponding target photoelectric composite active transponder according to the message information received by the optical signal receiving and transmitting original message module, then controls the DBPL coding module to code message data, and finally transmits the coded message data to an optical port data receiving and transmitting module II corresponding to the target photoelectric composite active transponder; the DBPL coding module is responsible for coding the message data; the 8.82KHz sine wave generation module generates an 8.82KHz sine wave signal, and the sine wave signal is amplified by the power amplification module and then is connected with a power line in the photoelectric composite cable to supply power to the photoelectric composite active transponder;
the optical signal receiving and transmitting coding message module realizes optical signal transmission between the O/E-LEU and the photoelectric composite active transponder; comprising the following steps: the second optical port data transceiver module and the optical communication interface; the second optical port data transceiver module comprises: the GTP RX module, the GTP TX module, the GTP receiving data storage module and the GTP sending data storage module; the GTP RX module and the GTP TX module are connected with a GTP interface in the optical communication interface, the output of the GTP RX module is connected with the GTP receiving data storage module, and the output of the GTP transmitting data storage module is connected with the GTP TX module; the optical signal receiving and transmitting coding message module is connected with an optical fiber in the photoelectric composite cable and is communicated with the photoelectric composite active transponder;
the program storage module is a memory chip and is used for storing programs operated by the photoelectric composite ground electronic unit;
the message storage module is a memory chip and is used for storing default message information sent to the photoelectric composite active transponder by the O/E-LEU;
the detection recording module is a memory chip and is used for storing O/E-LEU system state detection result data; the detection record data is transmitted back to the train control center through the optical port data receiving and transmitting module;
the power module provides working power for the O/E-LEU system.
2. The new generation of optoelectronic composite transponder transmission system of claim 1, wherein the communication process comprises:
step (1) communication between the LEU and the active transponder:
step (11), the power supply signal provided by the LEU to the active transponder is transmitted by a power line in the photoelectric composite cable, and the message signal transmitted by the LEU to the active transponder is transmitted by an optical fiber in the photoelectric composite cable, so that the independent transmission of the power supply signal and the message signal between the LEU and the active transponder is realized, the bidirectional transmission from a Train Control Center (TCC) to the LEU to the active transponder is realized, and all the LEU to the active transponder are in optical fiber bidirectional transmission;
step (12), the Train Control Center (TCC) performs optical fiber communication process from the LEU to the active transponder:
step (121), the Train Control Center (TCC) transmits the original report Wen Guang signal to the LEU through the optical fiber; typically, the LEU is connected to a plurality of active transponders, and each original message is sent to one of the target active transponders;
step (122), the LEU converts the received original report Wen Guang signal into an electric signal, codes according to the coding mode required by the national railway industry standard TB/T3485-2017 of the people's republic of China, converts the electric signal into a coded report Wen Guang signal, and transmits the coded report Wen Guang signal to a target active transponder through an optical-electrical composite cable;
step (123), the target active transponder converts the received coded report Wen Guang signal into an electrical signal for processing;
full duplex fiber optic communication of the Train Control Center (TCC) to the active transponder via the LEU:
step (21), a Train Control Center (TCC) and an LEU, wherein the LEU and an active transponder are communicated by adopting a receiving and transmitting full duplex optical fiber, and feedback channels from the active transponder to the LEU and the Train Control Center (TCC) are introduced;
step (22), the active transponders feed back information to a Train Control Center (TCC) through a feedback communication process from LEU to the TCC;
step (221), each active transponder encodes the electrical signal, converts the signal into a signal and transmits the signal back to the LEU;
step (222), the LEU converts the received optical signals into electrical signals, and the electrical signals are converted into optical signals after being received correctly and transmitted back to a Train Control Center (TCC);
step (223), the Train Control Center (TCC) converts the received optical signal into an electric signal, decodes and recovers the feedback information, and completes communication;
and (23) returning the message confirmation information received by the active transponder, the state sensing information of the next generation novel active transponder and the message and confirmation information issued by the vehicle-mounted equipment by using a feedback channel, so that a Train Control Center (TCC) can grasp the LEU and the relevant state information of the active transponder in real time.
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