CN114954575B - Vehicle-ground information transmission system and accurate positioning method - Google Patents
Vehicle-ground information transmission system and accurate positioning method Download PDFInfo
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- CN114954575B CN114954575B CN202210763209.8A CN202210763209A CN114954575B CN 114954575 B CN114954575 B CN 114954575B CN 202210763209 A CN202210763209 A CN 202210763209A CN 114954575 B CN114954575 B CN 114954575B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims description 25
- 230000003213 activating effect Effects 0.000 claims description 6
- 230000005674 electromagnetic induction Effects 0.000 claims description 6
- 230000000704 physical effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 abstract 1
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Classifications
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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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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a vehicle-ground information transmission system and an accurate positioning method, comprising the following steps: the integrated vehicle-mounted reader is arranged at the central position of the bottom of the vehicle body, the locator detects the intensity of wireless energy signals sent by the integrated vehicle-mounted reader in real time, when detecting that the energy signals are effective, the locator outputs train arrival signals to the trackside equipment, and the fixed information transmission unit and the variable information transmission unit do not need the trackside equipment to provide power supply 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 ground equipment, can provide accurate train positioning information for a vehicle-mounted host unit, can also transmit ground-train information in a wireless mode, form bidirectional positioning and information interaction between the vehicle-mounted equipment and the ground equipment, transmit ground signal real-time states, and improve control efficiency of a 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 a European standard transponder transmission system, a American standard beacon transmission system or fixed rail circuits, a shaft counting and other devices send position information or information with specific meanings to position and transmit the information to the train position through the ground;
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 cannot acquire the running position of the train; the positioning information of the track circuit and the axle counting equipment only can acquire train information, the train cannot acquire position information, and the positioning is inaccurate, and the positioning has the common characteristics that the positioning is performed through the transmitted data information and the unidirectional positioning is performed.
Improvements to the above problems are needed to meet market demands.
Disclosure of Invention
The invention aims to provide a train-ground information transmission system and an accurate positioning method, which are used for solving the problems that in the background technology, train-ground equipment cannot acquire train running positions while train-ground information can acquire position information; the positioning information of the track circuit and the axle counting equipment only can acquire train information, the train cannot acquire position information, and the positioning is inaccurate, and the positioning has the common characteristics that the positioning is performed through the transmitted data information and the positioning is a one-way positioning problem.
In order to achieve the above purpose, the present invention provides the following technical solutions: a vehicle-ground information transmission system and an accurate positioning method, comprising: the integrated vehicle-mounted reader is arranged at the central position of the bottom of the vehicle body, the locator detects the intensity of wireless energy signals sent by the integrated vehicle-mounted reader in real time, when detecting that the energy signals are effective, the locator outputs train arrival signals to the trackside equipment, the fixed information transmission unit and the variable information transmission unit do not need the trackside equipment to provide power supply when working normally, and the working power supplies of the fixed information transmission unit and the variable information transmission unit are provided by the integrated vehicle-mounted reader in a wireless mode;
the fixed information transmission unit is used for transmitting information with fixed line speed and fixed line parameters stored in the fixed information transmission unit; the variable information transmission unit transmits default message information stored in the interior or message information corresponding to an external input state, and selects a message of a corresponding storage area according to the state of 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 transmits energy signals required by ground equipment, receives data information transmitted by the ground information transmission unit, simultaneously transmits 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 a command of the vehicle-mounted host unit.
Preferably, the locator is used for collecting an energy signal sent by the integrated vehicle-mounted reader, taking the energy intensity as a detection index, continuously outputting a vehicle passing signal as a locating signal in the whole process from the time of detecting the energy signal until the energy signal disappears, and outputting the vehicle passing signal in a dry contact mode.
Preferably, the variable information transmission unit does not need external equipment to provide power supply during normal use, receives an energy signal sent by the integrated vehicle-mounted reader as a working power supply, starts working after obtaining a stable power supply, and sends out a message of a corresponding storage area in a wireless mode by collecting the input state of the trackside equipment.
Preferably, the fixed information transmission unit does not need external equipment to provide power supply during normal use, receives the energy signal sent by the integrated vehicle-mounted reader as a working power supply, starts working after obtaining a stable power supply, and sends the message information stored in the fixed information transmission unit in a wireless mode.
Preferably, the integrated vehicle-mounted reader continuously radiates wireless energy signals to the ground during normal operation, is used for activating ground equipment, providing working power for the ground equipment, passively receiving uploading link signals sent by the ground information transmission unit, generating positioning signals by taking the energy intensity as a detection index, receiving and demodulating and decoding the uploading link signals, obtaining the state of the ground trackside equipment, and sending the received message information and the received position information to the vehicle-mounted host unit in 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 is connected with the positioner and the trackside equipment 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 ground and workshops, and is also used for performing read-write operation on messages in the ground information transmission unit, where 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 generates a frequency for the uplink data PSK with a carrier frequency of 6.78MHz. The carrier frequency offset is 6.78MHz + -0.015 MHz. The data average data rate was 121.07 × (1±5%) kbit/s. The message length is 2 bytes, and the maximum is 512 bits;
2) The interface X-A4 is an interface for transmitting energy to the ground information transmission unit by the integrated vehicle-mounted reader and is used for activating ground equipment to work; the energy signal is a continuous signal, and the magnetic field frequency is 125 KHz+/-2 kHz;
3) The interface 'X-A5' is an interface for writing a default message of the fixed information transmission unit or writing messages of all storage partitions of the variable information transmission unit by adopting an electromagnetic induction mode, and 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, wherein the 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 the uploading 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 the 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 intensity of the downlink energy signal sent by the integrated vehicle-mounted reader, the positioner realizes accurate positioning through the intensity of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time when the signal intensity reaches the detection threshold until the signal intensity 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 the absolute physical center, and the physical center can be used as the accurate coordinate position of the position where the train arrives at the positioner.
Preferably, the information transmission channel is formed by 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 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 is sent out in a wireless mode.
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 train position by the trackside equipment, 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 accurate control of the train control system is facilitated to be improved.
2. The train-ground information transmission system and the accurate positioning method can perform ground-train wireless data communication, transmit ground signals in real time and improve the safety of the train control system.
3. The train-ground information transmission system and the accurate positioning method can be designed integrally 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 accord with 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 start-up time of the ground information transmission unit of the present invention;
FIG. 3 is a schematic diagram of the positioning principle of the positioner of the present invention;
fig. 4 is a schematic diagram of the positioning principle of the integrated vehicle-mounted reader of the present invention.
In the figure: 1. an integrated vehicle-mounted reader; 2. a positioner; 3. a fixed information transmission unit; 4. and a variable information transmission unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the present invention provides a technical solution: a vehicle-ground information transmission system and an accurate positioning method, comprising: the integrated vehicle-mounted reader 1, the positioner 2, the fixed information transmission unit 3 and the variable information transmission unit 4 are arranged at the central position of the bottom of a train, the positioner 2 detects the intensity of wireless energy signals sent by the integrated vehicle-mounted reader 1 in real time, when the energy signals are detected to be effective, the train arrival signals are output to the trackside equipment, the fixed information transmission unit 3 and the variable information transmission unit 4 do not need the trackside equipment to provide power supply 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 information of fixed line speed and fixed line parameters stored in the fixed information transmission unit; the variable information transmission unit 4 transmits default message information stored in the interior or message information corresponding to an external input state, and selects a message of a corresponding storage area according to the state of 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, the integrated vehicle-mounted reader 1 transmits an energy signal required by ground equipment, receives data information transmitted by the ground information transmission unit, simultaneously transmits 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 the energy signal sent by the integrated vehicle-mounted reader 1, takes the energy intensity as a detection index, continuously outputs the vehicle passing signal as a locating signal in the whole process from the time of detecting the energy signal until the energy signal disappears, and outputs the signal in a dry contact mode;
referring to fig. 1, the fixed information transmission unit 3 does not need an external device to provide power during normal use, and starts working 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 sends message information stored in the internal in a wireless manner;
referring to fig. 1, the variable information transmission unit 4 does not need an external device to provide power during normal use, receives an energy signal sent by the integrated vehicle-mounted reader 1 as a working power, starts working after obtaining a stable power, and selects a message of a corresponding storage area by collecting an input state of the trackside device, and sends the message 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 used for activating ground equipment, providing a working power supply for the ground equipment, passively receiving an uploading link signal sent by a ground information transmission unit, generating a positioning signal by taking the energy intensity as a detection index, receiving and demodulating, decoding the uploading link signal, obtaining the state of the ground trackside equipment, and sending the received message information and the received position information to a vehicle-mounted host unit in 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 is connected with the positioner 2 and the trackside equipment 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, and is used for data transmission between the ground and the workshop, and is also used for performing read-write operation on a message in the ground information transmission unit, where the interface "X-a" is functionally divided into the following 3 sub-interfaces:
1. the interface "X-A1" is an interface through which the ground information transmission unit transmits an uplink data message to the integrated in-vehicle reader 1; the uplink magnetic field generates a frequency for the uplink data PSK with a carrier frequency of 6.78MHz. The carrier frequency offset is 6.78MHz + -0.015 MHz. The data average data rate was 121.07 × (1±5%) kbit/s. Message length 2 byte standard type, maximum 512 bits;
2. the interface X-A4 is an interface for transmitting energy to the ground information transmission unit by the integrated vehicle-mounted reader 1 and is used for activating ground equipment to work; the energy signal is a continuous CW signal, and the magnetic field frequency is 125KHz + -2 kHz;
3. the interface 'X-A5' is an interface for writing a default message of the fixed information transmission unit 3 or writing a message of each storage partition of the variable information transmission unit 4 by adopting an electromagnetic induction mode, the writing process of the interface 'X-A5' writes the message 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, the variable information transmission unit 4 stores a plurality of messages, and the messages respectively correspond to a plurality of input states;
the vehicle-mounted information transmission system is characterized in that when an integrated vehicle-mounted reader 1 passes over a ground information transmission unit, a variable information transmission unit 4 connected to a track side device selects a message of a corresponding storage area according to the state provided by the track side device, if the state is wrong, the message of the corresponding storage area is output, if the state signal of the track side device is not found, a message of a default storage area is output, a fixed information transmission unit 3 outputs a fixed and prestored message, the integrated vehicle-mounted reader 1 sends uplink data input by an interface X-A1 to a vehicle-mounted host unit through an interface X-B, meanwhile, the information of the detected ground information transmission unit is output to the vehicle-mounted host unit in a switching value mode, the information is used as an accurate positioning signal, when the integrated vehicle-mounted reader 1 passes through the ground information transmission unit or later, the information of the detected ground information transmission unit is provided to the vehicle-mounted host unit, when the integrated vehicle-mounted reader 1 passes through a positioner 2, the information of the track side device is provided with the information of the integrated vehicle-mounted reader 1 (train), when the integrated vehicle-mounted reader 1 loses the function of the detected ground information transmission unit, the integrated vehicle-mounted reader 1 is read by referring to the vehicle-mounted information transmission unit, and after the integrated vehicle-mounted reader 1 is read by the vehicle-mounted information transmission unit, the information is read by referring to the vehicle-mounted information unit, and the vehicle-mounted information transmission unit is read by the vehicle-mounted information;
referring to fig. 1, the positioning signal is generated by the integrated vehicle-mounted reader 1 according to the strength of the uploading 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 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 the 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 intensity of a downlink energy signal sent by an integrated vehicle-mounted reader 1, the positioner 2 realizes accurate positioning through the intensity of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time when the signal intensity reaches the detection threshold until the intensity 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 a position where a train arrives at the positioner 2;
referring to fig. 1, the information transmission channel is formed between the ground device and the vehicle-mounted reader when the integrated vehicle-mounted reader 1 passes through or stops above the ground information transmission unit, and the ground information transmission unit starts to enter into a working mode after receiving an energy signal sent by the integrated vehicle-mounted reader 1, and sends out a default message stored in the fixed information transmission unit 3 or a message corresponding to a real-time state in the variable information transmission unit 4 in a wireless mode. The system has the functions of detecting the ground information transmission unit, uplink message transmission and data transmission delay.
Working principle: as shown in fig. 1 to 4, when the train-ground information transmission system and the accurate positioning method are used, the on-board equipment and the ground equipment of the train-ground information transmission system are installed at the bottom center position and the track center position, respectively, and when the integrated on-board reader 1 passes through or stops above the ground equipment, an information transmission channel between the on-board equipment and the ground equipment is formed. The integrated vehicle-mounted reader 1 continuously transmits energy and continuously detects 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 along with the smaller and smaller approach distance is larger and larger, and when the obtained magnetic flux reaches phid 1, the ground information transmission unit starts to work. To accommodate the greater train travel speeds, the ground information transfer unit should transmit data that can be demodulated and decoded during the Tu time. The fixed information transmission unit 3 transmits default messages stored internally, and the variable information transmission unit 4 selects messages of the corresponding storage area to transmit according to the externally input state. And stopping working when the integrated vehicle-mounted reader continues to move until the energy received by the ground information transmission unit is smaller than phid 1, and continuously sending a message of Te time within the working time Tw. When the integrated vehicle-mounted reader 1 passes through or stops above the corresponding ground positioner 2, a positioning channel between the vehicle-mounted equipment and the ground positioner 2 is formed, the positioner 2 can detect whether an energy signal sent by the integrated vehicle-mounted reader exists or not, and a switching value signal in a corresponding state is output to the trackside equipment to serve as a positioning signal;
the integrated vehicle-mounted reader 1 and the ground positioner 2 take the intensity of signals as the data source of accurate positioning, the data source of the integrated vehicle-mounted reader 1 is the intensity of uploading signals sent by a ground information transmission unit through an interface 'X-A1', the data source of the ground positioner 2 is the intensity of energy signals sent by the integrated vehicle-mounted reader 1 through an interface 'X-A4', when the vehicle-mounted reader passes over the ground positioner 2, the energy signals received by the positioner 2 are weakened from weak to strong and weakened for the duration Ton time, the energy signal intensity envelope is similar to a trapezoid, when the energy signals reach a threshold voltage Vth, the positioning signals are started to be output to trackside equipment to serve as confirmation signals for the train to reach a specified position, and the signals stop until the energy signals are lower than the threshold voltage Vth, and the duration time is Tc. If the integrated vehicle-mounted reader 1 stops above the locator 2, the locator 2 continuously outputs a locating signal to the trackside equipment, the trackside equipment can confirm that the train stops at a designated position according to the locating signal, when the vehicle-mounted reader passes above the ground information transmission units, the ground information transmission units start to work to send uploading signals after the energy reaches the working strength, the energy strength of the uploading signals received by the integrated vehicle-mounted reader 1 is weakened from weak to strong and then weakens for the duration Ton time, the uploading signal strength envelope is similar to a trapezoid shape, the locating signal starts to be generated when the uploading signals reach the threshold voltage Vth and is used as a confirmation signal of the train reaching a preset position, the locating 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 midpoint Center of Tc time as the time passing through the Center point of the ground information transmission units, the Center point time difference Tp of the two ground information transmission units is the absolute time difference of the two ground information transmission units, and the train speed information V transmitted by combining the vehicle-mounted host unit can accurately locate the train position, for example, if the position of the first ground information transmission unit passes through 0 meter, the train position of the train can accurately reach the ground position by the accurate method, and the train position is accurately calculated by the method.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A vehicle-to-ground information transmission system, comprising: the integrated vehicle-mounted reader (1), a positioner (2), a fixed information transmission unit (3) and a variable information transmission unit (4), and is characterized in that: the integrated vehicle-mounted reader (1) is arranged at the central position of the bottom of the vehicle body, the locator (2) detects the intensity of wireless energy signals sent by the integrated vehicle-mounted reader in real time, when the energy signals are detected to be effective, the train arrival signals are output to the trackside equipment, the trackside equipment is not required to provide power supply when the fixed information transmission unit (3) and the variable information transmission unit (4) work 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 integrated vehicle-mounted reader (1) continuously radiates wireless energy signals to the ground during normal operation, is used for activating ground equipment, providing a working power supply for the ground equipment, passively receiving an uploading link signal sent by the ground information transmission unit, generating a positioning signal by taking the energy intensity as a detection index, receiving, demodulating and decoding the uploading link signal to obtain the state of the ground trackside equipment, and sending the received message information and the received position information to the vehicle-mounted host unit in a bus communication mode and a switching value mode;
the interface 'X-A' between the integrated vehicle-mounted reader (1) and the ground equipment adopts an electromagnetic induction mode, is used for data transmission between ground and workshops, 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 plus or minus 0.015MHz, the data average data rate is 121.07 × (1 plus or minus 5%) kbit/s, the message length is 2 bytes, and the maximum is 512 bits;
2) The interface X-A4 is an interface for transmitting energy to the ground information transmission unit by the integrated vehicle-mounted reader (1) and is used for activating ground equipment to work; the energy signal is a Continuous (CW) signal, and the magnetic field frequency is 125KHz + -2 kHz;
3) The interface X-A5 is an interface for writing a default message of the fixed information transmission unit (3) or writing a message 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 message 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, the fixed information transmission unit (3) internally stores a default message, and the variable information transmission unit (4) stores a plurality of messages which respectively correspond to a plurality of input states;
the fixed information transmission unit (3) is used for transmitting information with fixed line speed and fixed line parameters stored in the fixed information transmission unit; the variable information transmission unit transmits default message information stored in the interior or message information corresponding to an external input state, and selects a message of a corresponding storage area according to the state of 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) transmits an energy signal required by ground equipment, receives data information transmitted by the ground information transmission unit, simultaneously transmits 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 a command of the vehicle-mounted host unit;
the variable information transmission unit (4) does not need external equipment to provide power supply during normal use, takes the energy signal sent by the integrated vehicle-mounted reader (1) as a working power supply, starts working after obtaining a stable power supply, and sends out the message in a wireless mode by collecting the message of the corresponding storage area selected by the input state of the trackside equipment.
2. A vehicle-to-ground information transmission system according to claim 1, wherein: the locator (2) is used for collecting energy signals sent by the integrated vehicle-mounted reader (1), takes energy intensity as a detection index, continuously outputs the vehicle passing signals as locating signals in the whole process from the detection of the energy signals until the energy signals disappear, and outputs the signals in a dry contact mode.
3. A vehicle-to-ground information transmission system according to claim 1, wherein: the fixed information transmission unit (3) does not need external equipment to provide power supply during normal use, and starts working after obtaining stable power supply by receiving the energy signal sent by the integrated vehicle-mounted reader (1) as a working power supply, and sends message information stored in the internal in a wireless mode.
4. A vehicle-to-ground information transmission system according to claim 1, wherein: 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) and the positioner (2) are connected with the trackside equipment through an X-C interface and an X-D interface, and the X-C interface and the X-D interface are both wired interfaces.
5. The vehicle-to-ground information transmission system of claim 1, comprising a positioning signal and an information transmission channel, wherein: the positioning signal is an integrated vehicle-mounted reader (1) which generates an integrated vehicle-mounted reader (1) according to the intensity of an uploading signal sent by a fixed information transmission unit (3) or a variable information transmission unit (4), accurate positioning is realized through the intensity of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time when the signal intensity reaches the detection threshold until the intensity is lower than the detection threshold, the continuous time is the positioning signal, the corresponding physical action area is the positioning area, the center of the positioning area is the absolute physical center, and the position of the train is accurately calculated according to the time and the speed between the two absolute physical centers after the integrated vehicle-mounted reader (1) continuously passes through the two ground information transmission units.
6. A vehicle-to-ground information transmission system according to claim 1, wherein: the positioning signal is generated by the positioner (2) according to the intensity of the downlink energy signal sent by the integrated vehicle-mounted reader (1), the positioner (2) realizes accurate positioning through the intensity of the signal, the continuous signal exceeding the detection threshold is the positioning signal from the time when the signal intensity reaches the detection threshold until the intensity 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 the absolute physical center, and the absolute physical center is used as the accurate coordinate position of the position where the train arrives at the positioner (2).
7. A vehicle-to-ground information transmission system according to claim 1, wherein: the information transmission channel is formed by the ground equipment and the vehicle-mounted reader when the integrated vehicle-mounted reader (1) 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 (1), and a default message stored in the fixed information transmission unit (3) or a message corresponding to a real-time state in the variable information transmission unit (4) is sent out in a wireless mode.
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