CN113859323A - Brand new generation photoelectric composite transponder transmission system - Google Patents
Brand new generation photoelectric composite transponder transmission system Download PDFInfo
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Abstract
The invention relates to a transmission system of a rail transit transponder, 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; 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 is communicated with the train control center through optical fibers. Aiming at the defects of the ground equipment of the traditional transponder transmission system, the message transmission among the photoelectric composite ground electronic unit (O/E-LEU), the Train Control Center (TCC) and the photoelectric composite active transponder adopts an optical fiber interface, and the photoelectric composite ground electronic unit has the characteristics of long transmission distance, low transmission delay, strong anti-jamming capability and full-duplex communication.
Description
Technical Field
The invention relates to ground equipment in a rail transit transponder transmission system.
Background
The current rail transit system plays an important role in 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 of a rail transit system, and is used for transmitting line characteristics such as gradient, turning radius and inclination angle of a train transmission line, temporary speed limit information, station route 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 (as shown in fig. 1) implemented based on an electromagnetic coupling principle, is used for transmitting information to a train from the ground at a specific place, and can send message information to a vehicle-mounted subsystem, so that fixed information can be transmitted, and variable information can be transmitted by connecting with a trackside unit. The ground equipment in a transponder transmission system includes a transponder and a ground electronic unit (LEU).
Transponders in transponder transmission systems are divided into passive transponders and active transponders. The passive transponder does not need to be powered and is used for transmitting fixed information stored in the transponder; 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 the variable transponder messages that need to be transmitted. The prior art active transponder circuit is constructed as shown in fig. 2, and includes a C-interface portion, an a-interface portion, and a storage and control module. 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 a ground electronic unit (LEU) are coupled on a pair of differential lines for transmission and are sent to an active transponder. In an active transponder, the memory unit primarily stores some fixed message information that will be sent in the event of a failure of the ground electronic unit (LEU) to connect to the active transponder. In the active responder, the control module is responsible for selecting the message to be sent.
A ground electronic unit (LEU) in ground equipment of a 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, and selects one of messages stored in the ground electronic unit (LEU) to be transmitted to a ground active transponder according to the change of external conditions, or directly transmits a transponder message transmitted by a Train Control Center (TCC) to the active transponder, a system block diagram of the existing ground electronic unit (LEU) is shown in fig. 3, and the system block diagram has the following main functions:
(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 one interface circuit fails, the communication between a ground electronic unit (LEU) and a Train Control Center (TCC) is not influenced.
The microprocessor periodically receives messages from a Train Control Center (TCC) through the communication interface and transmits the messages to the logic control unit, and the logic control unit changes the periodic messages into continuous messages to be output. If the channel fails or the interior of the electronic unit on the ground (LEU) fails, the microprocessor cannot receive the correct Train Control Center (TCC) message, and at this time, the corresponding default message is selected from the message memory and transmitted to the logic control unit.
In addition, the reliability of communication is ensured by adopting a safe communication protocol, and the method has the greatest characteristic of introducing a timestamp concept besides adopting common coding, frame structure definition and CRC (cyclic redundancy check), thereby ensuring the correctness, instantaneity and integrity of communication information and the correctness of information sequence.
(2) Logic control unit
After the message is received by the microprocessor, the message is dumped into a logic control unit, which corresponds to a transmission buffer, and cyclically outputs the message (e.g., 1023-bit-long message) at 564.48 kbps. Besides outputting message data, the logic control unit also generates 8.82KHz sine wave power supply signals required by the C6 interface.
(3) Power amplification
Since the message data signal C1 defined by the C interface and the interface power supply signal C6 are very different in frequency, power amplification needs to be performed separately. The amplified C1 and C6 signals are coupled into a transformer, thereby realizing the transmission of two signals on a pair of transmission lines.
In summary, the ground equipment of the existing transponder transmission system has the following disadvantages:
(1) the cable for connecting the ground electronic unit (LEU) and the active transponder is a special high-frequency twisted-pair shielded cable, which has the advantages of high price, short reliable transmission distance (the requirement of the China's republic of China railway industry standard TB/T3485 and 2017 is no more than 2.5km at most), low transmission rate (564.48kbps) and long message transmission delay.
(2) The Train Control Center (TCC) sends the message information to the ground electronic unit (LEU) through the communication interface (RS485/422 serial interface), the speed of the serial interface is low (38.4kbps), and the message transmission delay is large.
(3) The method is easy to be interfered by thunder and lightning, and the quality of the message baseband signal can be influenced by external electromagnetic interference.
(4) The ground electronic unit (LEU) couples the amplified power supply signal and the message signal to a special high-frequency twisted-pair shielding 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 (8.82kHz) of the power supply signal falls within the frequency band (564.48kHz) of the message baseband signal, the band-pass filter for filtering the power supply signal also filters partial message baseband signals, and the accuracy of DBPL decoding is reduced.
(5) Since a single surface electronics unit (LEU) is typically connected to a plurality of active transponder units at different distances, the signal quality received by the plurality of active transponders is less consistent. The active transponder with a close distance receives a good signal, and the active transponder with a far distance receives a poor signal.
(6) The ground electronic unit (LEU) communicates with the active transponder in a simplex manner, the ground electronic unit (LEU) can only detect whether the cable line is faulty, and the active transponder does not inform the ground electronic unit (LEU) whether the message is correctly received.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and develop a brand new generation of photoelectric composite transponder transmission system.
The technical scheme of the invention is as follows:
the transmission system of the brand new generation photoelectric composite transponder 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; 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 is communicated with the train control center through optical fibers.
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 module, a message storage module and a transponder control module. The interface part A, the message storage and responder control module and the functional relation among the interface part A and the responder control module adopt the prior art, wherein the interface part A comprises a coupling coil, filtering protection, a 27M high-frequency receiving filter, data receiving and transmitting and an interface A working power supply.
The O/E interface section includes: EMC protection module, O/E interface working power supply module, GTP interface, GTP peripheral interface circuit, optical port data transceiver module, data extraction module, logic control module, serial interface. The O/E interface part is externally connected with an optical-electrical composite cable, and the optical-electrical composite cable 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 of the power line, 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 to circuits of the whole O/E interface.
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 device comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data returning module, wherein the GTP RX module receives message data from a GTP interface and transfers the message data to the GTP data storage module for storage, the message data is returned and communicated to an opposite terminal through the GTP data returning module and the GTP TX module, and meanwhile, the message data is transmitted to a 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 device comprises a frame check module, a message decoding module and a differential Manchester coding waveform output module, wherein:
and the frame checking module completes message checking and checks message correctness.
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 a control bit and an additional bit of a message are correct or not; then, the code word generation module completes the code word conversion from 10 bits to 11 bits to generate a new code word; and the decoding output module outputs the code word obtained by decoding to the differential Manchester coding waveform output module.
The differential Manchester encoding waveform output module performs differential Manchester encoding and outputs a waveform to the serial interface.
The logic control module is used for respectively performing logic control on the optical port data transceiver module, the data extraction module and the serial interface according to an operation instruction, and the main contents of the logic control include 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 transmitting and receiving original message module, a logic control and coding module, an optical signal transmitting and receiving coding message module, a program storage module, a message storage module, a detection recording module, a power supply module and the like.
The optical signal receiving and transmitting original message module comprises: the optical communication interface and the optical interface data transceiver module I.
The optical communication interface includes: GTP interface, GTP interface peripheral circuit. The optical communication interface completes the conversion of the photoelectric signal, which is the prior art. The GTP interface may also be replaced by a higher rate GTX interface, GTH interface, or GTZ interface. The optical communication interfaces have two identical interfaces, so that the main and standby redundancy configuration is realized.
The first optical port data transceiver module comprises: the device comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data returning module. The GTP RX module receives message data from a GTP interface, the message data are stored by a GTP data storage module, the message data are transmitted back to a Train Control Center (TCC) through a GTP data back transmission module and a GTP TX module, and meanwhile, the message data are transmitted to a logic control and coding module for further processing.
The logic control and encoding module comprises: the device comprises a logic control module, a DBPL coding module (differential biphase level code) and an 8.82KHz sine wave generating module; the logic control module judges a corresponding target photoelectric composite active responder according to message information received by the original message receiving and transmitting module of the optical signal, then controls the DBPL coding module to code message data, and finally transmits the coded message data to a second optical port data receiving and transmitting module corresponding to the target photoelectric composite active responder. And the DBPL coding module is responsible for coding the message data. The 8.82KHz sine wave generating module generates an 8.82KHz sine wave signal, and the sine wave signal is amplified by the power amplifying 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 coded message module realizes optical signal transmission between the O/E-LEU and the photoelectric composite active transponder. The method comprises the following steps: the optical port data transceiver module II and the optical communication interface. The second optical port data transceiver module comprises: the device comprises a GTPRX module, a GTP TX module, a GTP receiving data storage module and a GTP sending data storage module. The GTP RX module and the GTP TX module are both 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 sending data storage module is connected with the GTP TX module. The optical signal receiving and transmitting coded message module is connected with optical fibers 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 a program operated by an optical-electrical 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 a first optical port data transceiver module.
And the power supply module provides a working power supply for the O/E-LEU system.
The communication process comprises the following steps:
step (1), the LEU and the active transponder communicate:
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, and the bidirectional transmission of the optical fiber from a Train Control Center (TCC) to the LEU and from the LEU to the active transponder is realized;
step (12), the optical fiber communication process from the Train Control Center (TCC) to the active transponder through the LEU is as follows:
step (121), the Train Control Center (TCC) transmits the original message optical signal to the LEU through the optical fiber; generally, an LEU is connected with a plurality of active transponders, and each original message is sent to one target active transponder;
step (122), the LEU converts the received original message optical signals into electric signals, codes the electric signals according to a coding mode required by the China's republic of China railway industry standard TB/T3485-2017, converts the electric signals into coded message optical signals, and transmits the coded message optical signals to a target active responder through a photoelectric composite cable;
step (123), the target active transponder converts the received coded message optical signal into an electric signal for processing;
after the improvement, the reliability of system transmission and the consistency of the quality of the signals received by the plurality of active transponders are improved, so that the time delay of message transmission is reduced, and the anti-jamming capability and reliability of transmission are improved.
And 2, full-duplex fiber communication from a Train Control Center (TCC) to the active transponder through the LEU:
step (21), a Train Control Center (TCC) and an LEU are adopted, and the LEU and an active transponder are in full-duplex fiber-optic communication, 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 can feed back information to a Train Control Center (TCC) through a feedback communication process from the LEU to the TCC;
step (221), each active responder encodes the electric signal, converts the electric signal into a signal and transmits the signal back to the LEU;
step (222), the LEU converts the received optical signal into an electric signal, converts the electric signal into an optical signal after the optical signal is correctly received, and transmits the optical signal back to a Train Control Center (TCC);
step (223), the Train Control Center (TCC) converts the received optical signal into an electrical signal and decodes the electrical signal to recover the feedback information, thereby completing communication;
and (23) returning the message confirmation information received by the active transponder, the state perception information of the next generation of novel active transponder, the message and confirmation information sent by the vehicle-mounted equipment and the like by using a feedback channel, so that a Train Control Center (TCC) can master the LEU and the relevant state information of the active transponder in real time.
The system comprises the following specific steps of modifying ground equipment: the method comprises the steps of transforming the existing LEU and the existing active transponder, connecting the LEU and the existing active transponder by adopting a photoelectric composite cable, so that Gbps full-duplex high-speed optical transmission is realized, and data message transmission between the transformed LEU (namely a photoelectric composite ground electronic unit (O/E-LEU)) and a Train Control Center (TCC) and between the transformed active transponder (namely a photoelectric composite active transponder) adopts full-duplex optical fiber communication, so that the construction of a new generation photoelectric composite transponder transmission system becomes possible, and the new generation photoelectric composite transponder transmission system is replaced by the traditional rail transit transponder transmission system.
Drawings
FIG. 1 is a schematic diagram of a model common to transponder transmission systems
FIG. 2 is a block diagram of a prior art active transponder system
FIG. 3 is a block diagram of a conventional terrestrial electronics unit (LEU) system
FIG. 4 block diagram of an opto-electronic hybrid active transponder system of the present application
FIG. 5 is a block diagram of an O/E interface portion of the present application showing an optoelectronic transceiver and signal processing circuit
FIG. 6 is a block diagram of an opto-electronic composite terrestrial electronic Unit (O/E-LEU) system of the present application
FIG. 7 is a block diagram of an opto-electronic composite terrestrial electronic unit (O/E-LEU) system circuit of the present application
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transmission system of the brand new generation of photoelectric composite transponder 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; 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 is communicated with the train control center through optical fibers. The specific scheme is to modify the existing transponder transmission system ground equipment, and the modified photoelectric composite active transponder (see fig. 4 and 5) and the modified photoelectric composite ground electronic unit (O/E-LEU) (see fig. 6 and 7) are included.
The photoelectric composite active transponder and the photoelectric composite ground electronic unit (O/E-LEU) are detailed in two parts.
A first part: photoelectric composite active transponder
As shown in fig. 4, a block diagram of the optoelectronic composite active transponder proposed by the present invention includes an a interface portion, an O/E interface portion, a manufacturing information storage, a message storage, and a transponder control module. The interface part A, the message storage and responder control module and the functional relation among the interface part A and the responder control module adopt the prior art, wherein the interface part A comprises a coupling coil, filtering protection, a 27M high-frequency receiving filter, data receiving and transmitting and an interface A working power supply.
The O/E interface part is the innovation part of the application and comprises: EMC protection module, O/E interface working power supply module, GTP interface, GTP peripheral interface circuit, optical port data transceiver module, data extraction module, logic control module, serial interface. For example, but not limitation, in the present embodiment, the O/E interface portion is implemented by an FPGA. The O/E interface part is externally connected with an optical-electrical composite cable, and the optical-electrical composite cable 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 of the power line, 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 to circuits of the whole O/E interface.
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, as shown in fig. 5, the optical port data transceiver module includes: the device comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data returning module, wherein the GTP RX module receives message data from a GTP interface and transfers the message data to the GTP data storage module for storage, the message data is returned and communicated to an opposite terminal through the GTP data returning module and the GTP TX module, and meanwhile, the message data is transmitted to a data extraction module for further processing. Note: in order to fully exert the advantage of large capacity of optical fiber transmission, the GTP data returning module not only returns the message stored in the GTP data storage module, but also returns the message data sent to the serial interface by the data extraction module and necessary working state information of the active responder.
The GTP interface is self-contained by the FPGA and is connected with the optical fiber interface through a GTP peripheral interface circuit. The peripheral GTP interface circuit is 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 device comprises a frame check module, a message decoding module and a differential Manchester coding waveform output module, wherein:
and the frame checking module completes message checking and checks message correctness.
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 a control bit and an additional bit of a message are correct or not; then, the code word generation module completes the code word conversion from 10 bits to 11 bits to generate a new code word; and the decoding output module outputs the code word obtained by decoding to the differential Manchester coding waveform output module.
The differential Manchester encoding waveform output module performs differential Manchester encoding and outputs a waveform to the serial interface.
The logic control module is used for respectively performing logic control on the optical port data transceiver module, the data extraction module and the serial interface according to an operation instruction, and the main contents of the logic control include 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 independently transmitted through the power line and the optical fiber in the photoelectric composite cable respectively without mutual influence. After the signal is sent to the photoelectric composite active transponder, the following treatment is carried out: (1) connecting a power line in the input photoelectric composite cable into an electromagnetic compatibility protection module (EMC) to prevent an input signal current and voltage signal from being overlarge to damage photoelectric composite active transponder equipment; then, the power supply is connected to a working power supply module to form a stable O/E interface part working power supply; (2) the method comprises the steps that optical fibers in an input photoelectric composite cable are connected to a GTP interface, and then message data are received through an optical interface data receiving and sending module; (3) the data extraction module is responsible for decoding the received message data and recovering bit streams of '0' and '1' of the original message; (4) if the message data recovered by the data extraction module passes the verification, the photoelectric composite active responder control module is informed to receive a new message, and the message information (or a message confirmation message for correct reception) is reversely transmitted back to the photoelectric composite ground electronic unit through the optical port data transceiver module, and the photoelectric composite ground electronic unit simultaneously transmits the message information to a Train Control Center (TCC) after receiving the message information; otherwise, transmitting a reception failure message back 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 optical-electrical composite ground electronic unit (O/E-LEU) includes seven functional modules, i.e., an optical signal transceiving original message module, a logic control and encoding module, an optical signal transceiving encoded message module, a program storage module, a message storage module, a detection recording module, and a power supply module. An implementation circuit diagram of an optical-electrical composite ground electronic unit (O/E-LEU) system is shown in fig. 7.
The optical signal receiving and transmitting original message module comprises: the optical communication interface and the optical interface data transceiver module I. The first optical port data transceiver module is an innovation of the invention.
The optical communication interface includes: GTR interface, GTR interface peripheral circuit. The optical communication interface completes the conversion of the photoelectric signal, which is the prior art. The GTP interface may also be replaced by a higher rate GTX interface, GTH interface, or GTZ interface. The optical communication interfaces have two identical interfaces, so that the main and standby redundancy configuration is realized.
The first optical port data transceiver module comprises: the device comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data returning module. The GTP RX module receives message data from a GTP interface, the message data are stored by a GTP data storage module, the message data are transmitted back to a Train Control Center (TCC) through a GTP data back transmission module and a GTP TX module, and meanwhile, the message data are transmitted to a logic control and coding module for further processing.
The logic control and encoding module comprises: the device comprises a logic control module, a DBPL coding module (differential biphase level code) and an 8.82KHz sine wave generating module; the logic control module judges a corresponding target photoelectric composite active responder according to message information received by the original message receiving and transmitting module of the optical signal, then controls the DBPL coding module to code message data, and finally transmits the coded message data to a second optical port data receiving and transmitting module corresponding to the target photoelectric composite active responder. The DBPL coding module is responsible for coding message data, and the specific flow is given in the national people's republic of China railway industry standard TB/T3485-2017. The 8.82KHz sine wave generating module generates an 8.82KHz sine wave signal, and the sine wave signal is amplified by the power amplifying 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 coded message module realizes optical signal transmission between an optical-electrical composite ground electronic unit (O/E-LEU) and an optical-electrical composite active transponder. The method comprises the following steps: the optical port data transceiver module II and the optical communication interface. The second optical port data transceiver module comprises: the device comprises a GTP RX module, a GTP TX module, a GTP receiving data storage module and a GTP sending data storage module. The GTP RX module and the GTP TX module are both 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 sending data storage module is connected with the GTP TX module. The optical signal receiving and transmitting coded message module is connected with optical fibers 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 a program operated by an optical-electrical 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 a photoelectric composite ground electronic unit (O/E-LEU).
The detection recording module is a memory chip and is used for storing the detection result data of the system state of the photoelectric composite ground electronic unit (O/E-LEU). The detection record data is transmitted back to a Train Control Center (TCC) through a first optical port data transceiver module.
The power supply module provides a working power supply for an optical-electrical 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 interface transceiver chip may be purchased to implement in combination with microprocessor chips such as an ARM and a DSP, so as to replace the optical interface data transceiver module in the embodiment to include: the system comprises a GTP RX module, a GTP TX module, a GTP data storage module, a GTP data returning module, a logic control module, a frame checking module, a message decoding module, a differential Manchester coding waveform output module and a serial interface for output.
In the embodiment, an FPGA is adopted to realize an O/E-LEU system. For example, but not limited to, a dedicated optical interface transceiver chip may be purchased and implemented in combination with an ARM, a DSP, and other microprocessor chips, so as to replace the first optical interface data transceiver module (including a GTP RX module, a GTP TX module, a GTP data storage module, and a GTP data backhaul module), the logic control and encoding module, and the 8.82KHz sine wave generating 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 prone to being damaged by electromagnetic interference such as thunder and lightning, the longest transmission distance can reach hundreds of kilometers, and the laying range of the active transponder is greatly enlarged.
Compared with the prior art, beneficial effect:
(1) the return loss of the optical fiber transmission performance can reach more than 50dB, the return loss is greatly superior to 6dB of the return loss of a special high-frequency twisted-pair shielding cable required by the railway industry standard TB/T3485-2017 of the people's republic of China, and the quality of received optical signals is greatly superior to the quality of electric signals.
(2) The transmission speed between a ground electronic unit (LEU) and the photoelectric composite active transponder is increased from the prior kbps to Gbps, and the message transmission delay is greatly reduced. Taking a typical 1023-bit message as an example, the transmission rate of the conventional 564.48kbps dedicated high-frequency twisted-pair shielded cable needs 1.8 milliseconds, while the transmission rate of the optical fiber using 1.25Gbps needs 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 prone to being damaged by electromagnetic interference such as thunder and lightning, the longest transmission distance can reach hundreds of kilometers, and the laying range of the active transponder is greatly enlarged.
(4) By adopting photoelectric composite cable transmission, a power supply signal of a ground electronic unit (LEU) is not coupled into a message baseband signal any more, and the message baseband signal is effectively prevented from being influenced by the power supply signal.
(5) And full duplex communication, namely, the message successfully decoded by the active transponder is transmitted back to a ground electronic unit (LEU) in real time through an optical fiber and is transmitted to a Train Control Center (TCC) through the ground electronic unit (LEU), so that the train control center and the ground electronic unit (LEU) can 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) after being transformed has the following advantages:
(1) the Train Control Center (TCC) transmits message data to the photoelectric composite ground electronic unit (O/E-LEU) and then to the active transponder by adopting optical fibers in the whole process, the return loss of the optical fiber transmission performance can reach more than 50dB, the return loss is greatly superior to the return loss of a special high-frequency twisted-pair shielding cable required by the railway industry standard TB/T3485 and 2017 of the people's republic of China, and the received optical signal quality is greatly superior to the electric signal quality.
(2) The whole transmission rate from a Train Control Center (TCC) to an optical-electrical composite ground electronic unit (O/E-LEU) and then to an 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, the transmission from the Train Control Center (TCC) to the ground electronic unit (LEU) using a conventional cable takes 26.6 milliseconds (38.4kbps serial interface rate); the surface electronics unit then forwards the message to the active transponder, which takes 1.8 milliseconds (564.48kbps serial interface rate) to transmit using conventional dedicated high frequency twisted pair shielded cable. The proposed fiber optic transmission (e.g., 1.25Gbps rate) 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 prone to being damaged by electromagnetic interference such as thunder and lightning, the longest transmission distance can reach hundreds of kilometers, and the laying range of the active transponder is greatly enlarged.
(4) By adopting the transmission of the photoelectric composite cable, the power supply signal of the photoelectric composite ground electronic unit (O/E-LEU) is not coupled to the message baseband signal any more, and the influence of the message baseband signal on the power supply signal is effectively avoided. The power supply signal can also be generated by other special power supply modules and independently supplied with power.
(5) Two-way communication confirmation mechanism: full duplex communication between the photoelectric composite ground electronic unit (O/E-LEU) and the active transponder, and full duplex communication between the photoelectric composite ground electronic unit (O/E-LEU) and the Train Control Center (TCC). Full duplex communication is adopted to realize bidirectional loop communication between a Train Control Center (TCC) and a photoelectric composite ground electronic unit (O/E-LEU) and then between the Train Control Center (TCC) and the photoelectric composite ground electronic unit (O/E-LEU) and an active responder, so that whether the content of a message received by the active responder is correct or not can be confirmed in real time by the Train Control Center (TCC) and the photoelectric composite ground electronic unit (O/E-LEU), and the reliability of message transmission is improved.
In summary, the system of the invention modifies the existing LEU and the existing active transponder, and adopts the connection of the photoelectric composite cable, thereby realizing the full-duplex high-speed optical transmission of Gbps, and the data message transmission between the modified LEU (namely, the photoelectric composite ground electronic unit (O/E-LEU)) and the Train Control Center (TCC) and the modified active transponder (namely, the photoelectric composite active transponder) adopts the full-duplex optical fiber communication, so as to construct a new generation photoelectric composite transponder transmission system, so as to replace the traditional rail transit transponder transmission system.
Claims (4)
1. The transmission system of the brand new generation photoelectric composite transponder 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; 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 is communicated with the train control center through optical fibers.
2. The transmission system of a brand-new generation optoelectric composite transponder of claim 1, wherein the optoelectric composite active transponder comprises an a interface portion, an O/E interface portion, a manufacturing information storage, a message storage, and a transponder control module;
the O/E interface section 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 interface data transceiver 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, and the optical-electrical composite cable 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 the input of the power line, 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 to 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 device comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data returning module, wherein the GTP RX module receives message data from a GTP interface and transfers the message data to the GTP data storage module for storage, the message data is returned and communicated to an opposite terminal through the GTP data returning module and the GTP TX module, and meanwhile, the message data is transmitted to a 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 device comprises a frame check module, a message decoding module and a differential Manchester coding waveform output module, wherein:
the frame check module completes message check and checks message correctness;
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 a control bit and an additional bit of a message are correct or not; then, the code word generation module completes the code word conversion from 10 bits to 11 bits to generate a new code word; the decoding output module outputs the code word obtained by decoding to the differential Manchester coding waveform output module;
the differential Manchester coding waveform output module executes differential Manchester coding and outputs a waveform to the serial interface;
the logic control module is used for respectively performing logic control on the optical port data transceiver module, the data extraction module and the serial interface according to an operation instruction, and the main contents of the logic control include enabling, resetting and synchronizing.
3. The transmission system of a brand-new generation photoelectric composite transponder according to claim 1, wherein the photoelectric composite ground electronic unit includes seven functional modules, namely an optical signal transceiving original message module, a logic control and encoding module, an optical signal transceiving encoded 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: the optical communication interface and the optical interface data receiving and transmitting module I;
the optical communication interface includes: GTP interface, GTP interface peripheral circuit; the optical communication interfaces have two identical interfaces to realize the main and standby redundancy configuration;
the first optical port data transceiver module comprises: the device comprises a GTP RX module, a GTP TX module, a GTP data storage module and a GTP data returning module; the GTP RX module receives message data from a GTP interface, the message data are stored by a GTP data storage module, the message data are transmitted back to the train control center through a GTP data back transmission module and a GTP TX module, and meanwhile, the message data are transmitted to a logic control and coding module for further processing;
the logic control and encoding module comprises: the device comprises a logic control module, a DBPL coding module and an 8.82KHz sine wave generating module; the logic control module judges a corresponding target photoelectric composite active responder according to message information received by an optical signal transceiving original message module, then controls the DBPL coding module to code message data, and finally transmits the coded message data to a second optical port data transceiving module corresponding to the target photoelectric composite active responder; the DBPL coding module is responsible for coding message data; the 8.82KHz sine wave generating module generates an 8.82KHz sine wave signal, and the sine wave signal is amplified by the power amplifying 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 coded message module realizes optical signal transmission between the O/E-LEU and the photoelectric composite active transponder; the method comprises the following steps: the optical port data receiving and transmitting module II and the optical communication interface; the second optical port data transceiver module comprises: the device comprises a GTP RX module, a GTP TX module, a GTP receiving data storage module and a GTP sending data storage module; the GTP RX module and the GTP TX module are both connected with a GTP interface in the optical communication interface, the output of the GTP RX module is connected with a GTP receiving data storage module, and the output of the GTP sending data storage module is connected with the GTP TX module; the optical signal receiving and transmitting coded 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 a program 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 the detection result data of the O/E-LEU system state. The detection recording data is transmitted back to the train control center through the first optical port data transceiver module;
and the power supply module provides a working power supply for the O/E-LEU system.
4. A brand new generation opto-electronic composite transponder transmission system as claimed in claim 2 or 3, characterized in that the communication process comprises:
step (1), the LEU and the active transponder communicate:
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, and the bidirectional transmission of the optical fiber from a Train Control Center (TCC) to the LEU and from the LEU to the active transponder is realized;
step (12), the optical fiber communication process from the Train Control Center (TCC) to the active transponder through the LEU is as follows:
step (121), the Train Control Center (TCC) transmits the original message optical signal to the LEU through the optical fiber; generally, an LEU is connected with a plurality of active transponders, and each original message is sent to one target active transponder;
step (122), the LEU converts the received original message optical signals into electric signals, codes the electric signals according to a coding mode required by the China's republic of China railway industry standard TB/T3485-2017, converts the electric signals into coded message optical signals, and transmits the coded message optical signals to a target active responder through a photoelectric composite cable;
step (123), the target active transponder converts the received coded message optical signal into an electric signal for processing;
and 2, full-duplex fiber communication from a Train Control Center (TCC) to the active transponder through the LEU:
step (21), a Train Control Center (TCC) and an LEU are adopted, the LEU and an active transponder are both in transceiving full-duplex fiber communication, and 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 the Train Control Center (TCC) through the feedback communication process from the LEU to the TCC;
step (221), each active responder encodes the electric signal, converts the electric signal into a signal and transmits the signal back to the LEU;
step (222), the LEU converts the received optical signal into an electric signal, converts the electric signal into an optical signal after the optical signal is correctly received, and transmits the optical signal back to a Train Control Center (TCC);
step (223), the Train Control Center (TCC) converts the received optical signal into an electrical signal and decodes the electrical signal to recover the feedback information, thereby completing communication;
and (23) returning the message confirmation information received by the active transponder, the state perception information of the next generation of novel active transponder, and the message and the confirmation information issued by the vehicle-mounted equipment by using a feedback channel, so that a Train Control Center (TCC) can master the LEU and the relevant state information of the active transponder in real time.
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