CN114954575A - Train-ground information transmission system and accurate positioning method - Google Patents
Train-ground information transmission system and accurate positioning method Download PDFInfo
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- CN114954575A CN114954575A CN202210763209.8A CN202210763209A CN114954575A CN 114954575 A CN114954575 A CN 114954575A CN 202210763209 A CN202210763209 A CN 202210763209A CN 114954575 A CN114954575 A CN 114954575A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or trains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/40—Handling position reports or trackside vehicle data
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/70—Details of trackside communication
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a train-ground information transmission system and an accurate positioning method, wherein the train-ground information transmission system comprises the following steps: the integrated vehicle-mounted reader is installed at the central position of the bottom of a vehicle body, the locator detects the strength of a wireless energy signal sent by the integrated vehicle-mounted reader in real time, when the energy signal is detected to be effective, a train arrival signal is output to trackside equipment, and the fixed information transmission unit and the variable information transmission unit do not need to supply power to the trackside equipment when working normally. The train-ground information transmission system and the accurate positioning method can provide accurate information of the passing position and the stopping position of the train for the ground equipment, provide accurate train positioning information for the vehicle-mounted host unit, and simultaneously can transmit the ground-train information in a wireless mode to form bidirectional positioning and information interaction between the vehicle-mounted equipment and the ground equipment, transmit the real-time state of the ground signal and improve the control efficiency of the train control system.
Description
Technical Field
The invention relates to the technical field of wireless near field communication systems and accurate positioning methods, in particular to a train-ground information transmission system and an accurate positioning method.
Background
The train running position in the rail transit is usually that the position information or the information with specific meaning is sent by equipment such as an European standard transponder transmission system, a American standard beacon transmission system or a fixed rail circuit, a shaft counter and the like through the ground to position and transmit the information;
the transponder transmission system and the beacon system provide position information for the vehicle-mounted equipment, namely the train can acquire the position information, and the ground equipment can not acquire the train running position; the positioning information of the track circuit and the axle counting equipment only can obtain train information through ground equipment, the train cannot obtain position information, and the positioning is not accurate.
Improvements are needed to address the above issues to meet market demands.
Disclosure of Invention
The invention aims to provide a train-ground information transmission system and an accurate positioning method, which aim to solve the problems that the prior art proposes that a train can obtain position information but ground equipment can not obtain the running position of the train; the positioning information of the track circuit and the axle counting equipment only can acquire train information by ground equipment, the train cannot acquire position information, and the positioning is not accurate.
In order to achieve the purpose, the invention provides the following technical scheme: a train-ground information transmission system and a precise positioning method comprise the following steps: the integrated vehicle-mounted reader is arranged at the central position of the bottom of a vehicle body, the locator detects the strength of a wireless energy signal sent by the integrated vehicle-mounted reader in real time, when the energy signal is detected to be effective, a train arrival signal is output to trackside equipment, the power supply of the trackside equipment is not required to be provided when the fixed information transmission unit and the variable information transmission unit normally work, and the working power supply of the fixed information transmission unit and the variable information transmission unit is provided by the integrated vehicle-mounted reader in a wireless mode;
the fixed information transmission unit transmits information with fixed line speed and fixed line parameters stored inside; the variable information transmission unit transmits default message information stored inside or message information corresponding to an external input state, and selects a message of a corresponding storage area according to the state of the external trackside equipment;
the fixed information transmission unit and the variable information transmission unit start information transmission only when an action area exists between the fixed information transmission unit and the integrated vehicle-mounted reader, the integrated vehicle-mounted reader sends energy signals required by ground equipment, receives data information sent by the ground information transmission unit, sends the received data information to the vehicle-mounted host unit, and can start or stop the function of detecting the ground information transmission unit according to the command of the vehicle-mounted host unit.
Preferably, the locator collects energy signals sent by the integrated vehicle-mounted reader, the energy intensity is used as a detection index, the vehicle-passing signals are continuously output as the locating signals in the whole process from the time of detecting the energy signals until the energy signals disappear, and the vehicle-passing signals are output in a dry contact manner.
Preferably, the variable information transmission unit does not need an external device to provide a power supply during normal use, starts to work after obtaining a stable power supply by receiving an energy signal sent by the integrated vehicle-mounted reader as a working power supply, selects a message of a corresponding storage area by acquiring the input state of the trackside device, and sends the message out in a wireless manner.
Preferably, the fixed information transmission unit does not need an external device to provide power during normal use, and by receiving an energy signal sent by the integrated vehicle-mounted reader as a working power supply, the fixed information transmission unit starts to work after obtaining a stable power supply, and sends message information stored inside in a wireless mode.
Preferably, the integrated vehicle-mounted reader continuously radiates wireless energy signals to the ground during normal operation, and is used for activating ground equipment, providing a working power supply for the ground equipment, passively receiving uplink signals sent by the ground information transmission unit, generating positioning signals by taking energy intensity as a detection index, receiving, demodulating and decoding the uplink signals to obtain the state of the ground trackside equipment, and sending received message information and position information to the vehicle-mounted host unit through a bus communication mode and a switching value mode.
Preferably, the integrated vehicle-mounted reader is connected with the vehicle-mounted host unit through an X-B interface, the X-B interface is a wired interface, the integrated vehicle-mounted reader is connected with the ground equipment through an X-A interface, the X-A interface is a wireless interface, the variable information transmission unit, the locator and the trackside equipment are connected through an X-C interface and an X-D interface, and the X-C interface and the X-D interface are both wired interfaces.
Preferably, an interface "X-a" between the integrated vehicle-mounted reader and the ground device adopts an electromagnetic induction mode, and is used for data transmission between a ground and a workshop and also used for performing read-write operation on messages in a ground information transmission unit, and the interface "X-a" is functionally divided into the following 3 sub-interfaces:
1) the interface X-A1 is an interface for transmitting uplink data messages to the integrated vehicle-mounted reader by the ground information transmission unit; the uplink magnetic field produces a frequency for uplink data PSK, with a carrier frequency of 6.78 MHz. The carrier frequency offset is 6.78MHz + -0.015 MHz. The data average data rate was 121.07 × (1 ± 5%) kbit/s. The length of the message is 2 bytes, and the maximum length is 512 bits;
2) the interface X-A4 is an interface for transmitting energy from the integrated vehicle-mounted reader to the ground information transmission unit, and is used for activating the ground equipment to work; the energy signal is a continuous signal, and the frequency of the magnetic field is 125KHz +/-2 kHz;
3) the interface X-A5 is an interface for writing default messages of the fixed information transmission unit or writing messages of each storage partition of the variable information transmission unit in an electromagnetic induction mode, the writing process of the interface X-A5 writes the messages into a memory in the fixed information transmission unit or the variable information transmission unit in a wireless mode through a special message configuration tool, one default message is stored in the fixed information transmission unit, and the variable information transmission unit stores a plurality of messages which respectively correspond to a plurality of input states.
Preferably, the positioning signal is generated by the integrated vehicle-mounted reader according to the strength of an uploaded signal sent by the fixed information transmission unit or the variable information transmission unit, the integrated vehicle-mounted reader realizes accurate positioning through the strength of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time when the signal strength reaches the detection threshold until the strength is lower than the detection threshold, the continuous time is the positioning time, the corresponding physical action area is the positioning area, and the center of the positioning area is an absolute physical center. After the integrated vehicle-mounted reader continuously passes through the two ground information transmission units, the position of the train can be accurately calculated according to the time and the speed between the two absolute physical centers.
Preferably, the positioning signal is generated by the positioner according to the strength of a downlink energy signal sent by the integrated vehicle-mounted reader, the positioner realizes accurate positioning through the strength of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time the signal strength reaches the detection threshold until the strength is lower than the detection threshold, the continuous time is the positioning time, the corresponding physical action area is the positioning area, the center of the positioning area is an absolute physical center, and the physical center can be used as the accurate coordinate position of the position where the train reaches the positioner.
Preferably, the information transmission channel is formed between the ground equipment and the vehicle-mounted reader when the integrated vehicle-mounted reader passes through or stops above the ground information transmission unit, the ground information transmission unit starts to enter a working mode after receiving an energy signal sent by the integrated vehicle-mounted reader, and sends out a default message stored in the fixed information transmission unit or a message corresponding to a real-time state in the variable information transmission unit in a wireless mode, and the system has a function of detecting the ground information transmission unit, a function of transmitting uplink messages and a function of delaying data transmission.
Compared with the prior art, the invention has the beneficial effects that:
1. the train-ground information transmission system and the accurate positioning method can realize the accurate positioning of the trackside equipment on the position of the train, and meanwhile, the vehicle-mounted equipment can also carry out the accurate positioning according to the wireless signals sent by the ground equipment, so that the accurate position information is transmitted in time, and the improvement of the accurate control of a train control system is facilitated.
2. The train-ground information transmission system and the accurate positioning method can carry out ground-train wireless data communication, transmit the real-time state of ground signals and improve the safety of a train control system.
3. The vehicle-ground information transmission system and the accurate positioning method can be integrally designed through the vehicle-mounted reading module, have no independent receiving and transmitting antenna and corresponding processing host, have the characteristics of low cost and simple system, and meet the working frequency band of the radio frequency identification system.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic diagram of the ground information transmission unit start-up time of the present invention;
FIG. 3 is a schematic view of the positioner positioning principle of the present invention;
FIG. 4 is a schematic diagram of the integrated in-vehicle reader positioning principle of the present invention.
In the figure: 1. an integrated vehicle-mounted reader; 2. a positioner; 3. a fixed information transmission unit; 4. a variable information transmission unit.
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.
Referring to fig. 1-4, the present invention provides a technical solution: a train-ground information transmission system and a precise positioning method comprise the following steps: the integrated vehicle-mounted reader 1 is installed at the central position of the bottom of a train, the locator 2 detects the strength of a wireless energy signal sent by the integrated vehicle-mounted reader 1 in real time, when the energy signal is detected to be effective, a train arrival signal is output to trackside equipment, the fixed information transmission unit 3 and the variable information transmission unit 4 do not need to be powered by the trackside equipment when working normally, and the working power supplies of the fixed information transmission unit 3 and the variable information transmission unit 4 are provided by the integrated vehicle-mounted reader 1 in a wireless mode;
the fixed information transmission unit 3 transmits the information of internally stored fixed line speed and fixed line parameters; the variable information transmission unit 4 transmits the default message information stored inside or the message information corresponding to the external input state, and selects the message of the corresponding storage area according to the state of the external trackside equipment;
the fixed information transmission unit 3 and the variable information transmission unit 4 start information transmission only when an action area exists between the integrated vehicle-mounted reader 1 and the integrated vehicle-mounted reader 1, the integrated vehicle-mounted reader 1 sends energy signals required by ground equipment, receives data information sent by the ground information transmission unit, sends the received data information to the vehicle-mounted host unit, and can start or stop detecting the function of the ground information transmission unit according to the command of the vehicle-mounted host unit
Referring to fig. 1, the locator 2 collects an energy signal emitted by the integrated vehicle-mounted reader 1, takes energy intensity as a detection index, and continuously outputs a vehicle passing signal as a locating signal in the whole process from the detection of the energy signal to the disappearance of the energy signal, and outputs the signal in a dry contact manner;
referring to fig. 1, the fixed information transmission unit 3 does not need an external device to provide power during normal use, and starts to operate after obtaining a stable power by receiving an energy signal sent by the integrated vehicle-mounted reader 1 as a working power, and sends message information stored inside in a wireless manner;
referring to fig. 1, the variable information transmission unit 4 does not need an external device to provide a power supply during normal use, starts to operate after obtaining a stable power supply by receiving an energy signal sent by the integrated vehicle-mounted reader 1 as a working power supply, selects a message in a corresponding storage area by acquiring an input state of a trackside device, and sends the message out in a wireless manner;
referring to fig. 1, the integrated vehicle-mounted reader 1 continuously radiates a wireless energy signal to the ground during normal operation, and is configured to activate ground equipment, provide a working power supply for the ground equipment, passively receive an upload link signal sent by a ground information transmission unit, generate a positioning signal by using energy intensity as a detection index, receive, demodulate and decode the upload link signal, obtain a ground trackside equipment state, and send received message information and position information to a vehicle-mounted host unit through a bus communication mode and a switching value mode;
referring to fig. 1, the integrated vehicle-mounted reader 1 is connected with the vehicle-mounted host unit through an "X-B" interface, the "X-B" interface is a wired interface, the integrated vehicle-mounted reader 1 is connected with the ground equipment through an "X-a" interface, the "X-a" interface is a wireless interface, the variable information transmission unit 4, the locator 2 and the trackside equipment are connected through an "X-C" interface and an "X-D" interface, and the "X-C" interface and the "X-D" interface are both wired interfaces;
referring to fig. 1, an interface "X-a" between the integrated vehicle-mounted reader 1 and the ground device adopts an electromagnetic induction mode, is used for data transmission between the ground and the workshop, and is also used for performing read-write operation on messages in the ground information transmission unit, and the interface "X-a" is functionally divided into the following 3 sub-interfaces:
1. the interface "X-a 1" is an interface for the ground information transmission unit to transmit uplink data messages to the integrated vehicle-mounted reader 1; the uplink magnetic field produces a frequency for uplink data PSK, with a carrier frequency of 6.78 MHz. The carrier frequency offset is 6.78MHz + -0.015 MHz. The data average data rate was 121.07 × (1 ± 5%) kbit/s. The length of the message is 2 bytes of standard type, and the maximum length is 512 bits;
2. the interface X-A4 is an interface for transmitting energy from the integrated vehicle-mounted reader 1 to the ground information transmission unit, and is used for activating the ground equipment to work; the energy signal is a continuous CW signal, and the frequency of the magnetic field is 125KHz +/-2 kHz;
3. the interface "X-a 5" is an interface for writing default messages of the fixed information transmission unit 3 or writing messages of each storage partition of the variable information transmission unit 4 in an electromagnetic induction manner, and the writing process of the interface "X-a 5" writes messages into the memories of the fixed information transmission unit 3 or the variable information transmission unit 4 in a wireless manner through a special message configuration tool, one default message is stored in the fixed information transmission unit 3, and the variable information transmission unit 4 stores a plurality of messages, which correspond to a plurality of input states respectively;
in the train-ground information transmission system, when the integrated vehicle-mounted reader 1 passes over the ground information transmission unit, the variable information transmission unit 4 connected to the trackside equipment selects the message of the corresponding storage area according to the state provided by the trackside equipment, if the state is wrong, an error state message is output, if the state signal of the trackside equipment does not exist, the message of the default storage area is output, the fixed information transmission unit 3 outputs a fixed and pre-stored message, the integrated vehicle-mounted reader 1 sends the uplink data input by the interface X-A1 to the vehicle-mounted host unit through the interface X-B, simultaneously outputs the information of the detected ground information transmission unit to the vehicle-mounted host unit in a switching value mode as an accurate positioning signal, and when or after the integrated vehicle-mounted reader 1 passes through the ground information transmission unit, the information of the detected ground information transmission unit is provided to the vehicle-mounted host unit, when the integrated vehicle-mounted reader 1 loses the function of detecting a ground information transmission unit, the integrated vehicle-mounted reader 1 filters the received message transmitted by the ground information transmission unit and provides a decoded message meeting the time delay requirement to the vehicle-mounted host unit, and when the reference mark of the integrated vehicle-mounted reader 1 passes through the reference mark of the ground information transmission unit and does not exceed 1m, the vehicle-mounted reader prepares the message information of the information transmission unit;
referring to fig. 1, a positioning signal is generated by the integrated vehicle-mounted reader 1 according to the strength of an uploaded signal sent by the fixed information transmission unit 3 or the variable information transmission unit 4, the integrated vehicle-mounted reader 1 realizes accurate positioning according to the strength of the signal, a continuous signal exceeding a detection threshold is the positioning signal from the time the signal strength reaches the detection threshold until the strength is lower than the detection threshold, the continuous time is the positioning time, a corresponding physical action area is a positioning area, and the center of the positioning area is an absolute physical center. After the integrated vehicle-mounted reader 1 continuously passes through the two ground information transmission units, the position of the train can be accurately calculated according to the time and the speed between the two absolute physical centers;
referring to fig. 1, a positioning signal is generated by a positioner 2 according to the strength of a downlink energy signal sent by an integrated vehicle-mounted reader 1, the positioner 2 realizes accurate positioning through the strength of the signal, the continuous signal exceeding a detection threshold is the positioning signal from the moment the signal strength reaches the detection threshold until the strength is lower than the detection threshold, the continuous time is positioning time, a corresponding physical action area is a positioning area, the center of the positioning area is an absolute physical center, and the physical center can be used as an accurate coordinate position of the position where a train reaches the positioner 2;
referring to fig. 1, an information transmission channel is formed between a ground device and a vehicle-mounted reader when the integrated vehicle-mounted reader 1 passes through or stops above a ground information transmission unit, the ground information transmission unit starts to enter a working mode after receiving an energy signal sent by the integrated vehicle-mounted reader 1, and a default message stored in a fixed information transmission unit 3 or a message corresponding to a real-time state in a variable information transmission unit 4 is sent out in a wireless manner. The system has the functions of detecting a ground information transmission unit, transmitting uplink messages and delaying data transmission.
The working principle is as follows: as shown in fig. 1 to 4, when using the train-ground information transmission system and the accurate positioning method, the on-board device and the ground device of the train-ground information transmission system are installed at the central position of the bottom of the train and the central position of the track, respectively, and when the integrated on-board reader 1 passes through or stops above the ground device, an information transmission channel between the on-board device and the ground device is formed. The integrated vehicle-mounted reader 1 continuously sends energy to uninterruptedly detect the ground information transmission unit, when the integrated vehicle-mounted reader 1 reaches the position above the ground information transmission unit, the energy magnetic flux obtained by the ground information transmission unit is larger and larger along with the smaller and smaller approach distance, and when the obtained magnetic flux reaches phi d1, the ground information transmission unit starts to work. In order to adapt to the larger train running speed, the ground information transmission unit should transmit the data which can be demodulated and decoded within the Tu time. The fixed information transmission unit 3 transmits the default message stored inside, and the variable information transmission unit 4 selects the message of the corresponding storage area to transmit according to the state input from the outside. And when the integrated vehicle-mounted reader continues to move until the energy received by the ground information transmission unit is less than phi d1, stopping working, and continuously sending the message of Te time within the working time Tw. When the integrated vehicle-mounted reader 1 passes through or stops above the corresponding ground locator 2, a locating channel between the vehicle-mounted equipment and the ground locator 2 is formed, the locator 2 can detect whether an energy signal sent by the integrated vehicle-mounted reader exists or not, and outputs a switching value signal in a corresponding state to the trackside equipment as a locating signal;
the strength of a signal is used as a data source of accurate positioning by the integrated vehicle-mounted reader 1 and the ground locator 2, the data source of the integrated vehicle-mounted reader 1 is the strength of an uploading signal sent by the ground information transmission unit through an interface X-A1, the data source of the ground locator 2 is the strength of an energy signal sent by the integrated vehicle-mounted reader 1 through an interface X-A4, when the vehicle-mounted reader passes above the ground locator 2, the energy signal received by the locator 2 is weakened from weak to strong and then weakened for Ton time, the energy signal strength envelope is similar to a ladder shape, when the energy signal reaches a threshold voltage Vth, the locating signal is started to be output to a trackside device to serve as a confirmation signal of the train reaching a specified position, the signal is stopped until the energy signal is lower than the threshold voltage Vth, and the duration is Tc. If the integrated vehicle-mounted reader 1 stops above the locator 2, the locator 2 continuously outputs a locating signal to a trackside device, the trackside device can confirm that the train stops at a specified position according to the signal, when the vehicle-mounted reader passes over the ground information transmission unit, the ground information transmission unit starts to work and transmits an uploading signal after the energy reaches the working strength, the uploading signal received by the integrated vehicle-mounted reader 1 is subjected to Ton time which is totally continued for the energy strength of the uploading signal to change from weak to strong and then to weak, the uploading signal strength envelope is similar to a ladder shape, the locating signal is generated when the uploading signal reaches a threshold voltage Vth and is used as a confirmation signal for the train to reach a preset position, the signal stops until the energy signal is lower than the threshold voltage Vth, the duration is Tc, the integrated vehicle-mounted reader 1 takes the middle point Center of the Tc time as the time for passing through the Center point of the ground information transmission unit, the time difference Tp between the central points of the two ground information transmission units is the absolute time difference between the two ground information transmission units, and the train position can be accurately positioned by combining the train speed information V transmitted by the vehicle-mounted host unit, for example, if the position of the train passing through the first ground information transmission unit is 0 meter, the train can accurately calculate the accurate position reaching V multiplied by Tp meter after passing through the second ground information transmission unit, which is the characteristic of the train-ground information transmission system and the accurate positioning method.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A vehicle-to-ground information transfer system comprising: integration on-vehicle reader (1), locator (2), fixed information transmission unit (3) and variable information transmission unit (4), its characterized in that: the integrated vehicle-mounted reader (1) is installed at the central position of the bottom of a vehicle body, the locator (2) detects the strength of a wireless energy signal sent by the integrated vehicle-mounted reader in real time, when the energy signal is detected to be effective, a train arrival signal is output to trackside equipment, the trackside equipment is not required to provide a power supply when the fixed information transmission unit (3) and the variable information transmission unit (4) work normally, and the working power supply of the fixed information transmission unit (3) and the variable information transmission unit (4) is provided by the integrated vehicle-mounted reader (1) in a wireless mode;
the fixed information transmission unit (3) transmits information with fixed line speed and fixed line parameters stored inside; the variable information transmission unit transmits default message information stored inside or message information corresponding to an external input state, and selects a message of a corresponding storage area according to the state of the external trackside equipment;
the fixed information transmission unit (3) and the variable information transmission unit (4) start information transmission only when an action area exists between the fixed information transmission unit and the integrated vehicle-mounted reader (1), the integrated vehicle-mounted reader (1) sends energy signals required by ground equipment, receives data information sent by the ground information transmission unit, sends the received data information to the vehicle-mounted host unit, and can start or stop the function of detecting the ground information transmission unit according to the command of the vehicle-mounted host unit.
2. A vehicle-ground information transmission system according to claim 1, characterized in that: the locator (2) collects energy signals sent by the integrated vehicle-mounted reader (1), the energy intensity is used as a detection index, the vehicle passing signals are continuously output as locating signals in the whole process from the time of detecting the energy signals until the energy signals disappear, and the locating signals are output in a dry contact mode.
3. A vehicle-ground information transmission system according to claim 1, characterized in that: the fixed information transmission unit (3) does not need external equipment to provide power supply during normal use, receives an energy signal sent by the integrated vehicle-mounted reader (1) to serve as a working power supply, starts to work after obtaining a stable power supply, and sends message information stored in the fixed information transmission unit in a wireless mode.
4. A vehicle-ground information transmission system according to claim 1, characterized in that: the variable information transmission unit (4) does not need external equipment to provide power supply during normal use, and starts to work after obtaining a stable power supply by receiving an energy signal sent by the integrated vehicle-mounted reader (1) as a working power supply, and selects a message of a corresponding storage area by acquiring the input state of trackside equipment, and sends the message out in a wireless mode.
5. A vehicle-ground information transmission system according to claim 1, characterized in that: the integrated vehicle-mounted reader (1) continuously radiates wireless energy signals to the ground during normal work, is used for activating ground equipment, providing a working power supply for the ground equipment, passively receives uplink signals sent by a ground information transmission unit, takes energy intensity as a detection index, generates positioning signals, receives, demodulates and decodes the uplink signals, obtains the state of ground trackside equipment, and sends received message information and position information to a vehicle-mounted host unit through a bus communication mode and a switching value mode.
6. A vehicle-ground information transmission system according to claim 1, characterized in that: the integrated vehicle-mounted reader (1) is connected with the vehicle-mounted host unit through an X-B interface, the X-B interface is a wired interface, the integrated vehicle-mounted reader (1) is connected with ground equipment through an X-A interface, the X-A interface is a wireless interface, the variable information transmission unit (4), the positioner (2) and the trackside equipment are connected through an X-C interface and an X-D interface, and the X-C interface and the X-D interface are wired interfaces.
7. A vehicle-ground information transmission system according to claim 1, characterized in that: an interface X-A between the integrated vehicle-mounted reader (1) and ground equipment adopts an electromagnetic induction mode, is used for data transmission between a ground and a workshop and is also used for performing read-write operation on messages in a ground information transmission unit, and the interface X-A is functionally divided into the following 3 sub-interfaces:
1) the interface X-A1 is an interface for transmitting uplink data messages to the integrated vehicle-mounted reader (1) by the ground information transmission unit; the uplink magnetic field generates a frequency for uplink data PSK, the carrier frequency is 6.78MHz, the carrier frequency offset is 6.78MHz +/-0.015 MHz, the average data rate is 121.07 x (1 +/-5%) kbit/s, the message length is 2 bytes (standard type), and the maximum is 512 bits;
2) the interface X-A4 is an interface for transmitting energy from the integrated vehicle-mounted reader (1) to the ground information transmission unit, and is used for activating ground equipment to work; the energy signal is a Continuous (CW) signal, and the frequency of the magnetic field is 125KHz +/-2 kHz;
3) the interface X-A5 is an interface for writing default messages of the fixed information transmission unit (3) or writing messages of each storage partition of the variable information transmission unit (4) in an electromagnetic induction mode, the writing process of the interface X-A5 writes the messages into a memory in the fixed information transmission unit (3) or the variable information transmission unit (4) in a wireless mode through a special message configuration tool, one default message is stored in the fixed information transmission unit (3), and the variable information transmission unit (4) stores a plurality of messages which respectively correspond to a plurality of input states.
8. The accurate positioning method for the vehicle-ground information transmission comprises a positioning signal and an information transmission channel, and is characterized in that: the positioning signal is that the integrated vehicle-mounted reader (1) generates the integrated vehicle-mounted reader (1) according to the strength of an uploaded signal sent by the fixed information transmission unit (3) or the variable information transmission unit (4) to realize accurate positioning through the strength of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time the signal strength reaches the detection threshold until the strength is lower than the detection threshold, the continuous time is the positioning time, the corresponding physical action area is the positioning area, the center of the positioning area is an absolute physical center, and after the integrated vehicle-mounted reader (1) continuously passes through the two ground information transmission units, the position of the train can be accurately calculated according to the time and the speed between the two absolute physical centers.
9. The accurate positioning method for vehicle-ground information transmission according to claim 8, characterized in that: the positioning signal is generated by the positioner (2) according to the strength of a downlink energy signal sent by the integrated vehicle-mounted reader (1), the positioner (2) realizes accurate positioning through the strength of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the moment the signal strength reaches the detection threshold until the strength is lower than the detection threshold, the continuous time is the positioning time, the corresponding physical action area is a positioning area, the center of the positioning area is an absolute physical center, and the physical center can be used as the accurate coordinate position of the position where the train reaches the positioner (2).
10. The accurate positioning method for vehicle-ground information transmission according to claim 9, characterized in that: the information transmission channel is formed between ground equipment and a vehicle-mounted reader when the integrated vehicle-mounted reader (1) passes through or stops above a ground information transmission unit, the ground information transmission unit starts to enter a working mode after receiving an energy signal sent by the integrated vehicle-mounted reader (1), and sends out a default message stored in a fixed information transmission unit (3) or a message corresponding to a real-time state in a variable information transmission unit (4) in a wireless mode.
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