ETCS-based train-to-ground communication method, train-mounted device, ground device, and storage medium

Abstract

Disclosed are an ETCS-based train-to-ground communication method, a train-mounted device, a ground device, and a storage medium. The method comprises: the train-mounted device of a train receiving prediction information pertaining to a forward loop region sent by a ground transponder, the prediction information comprising a loop identification number, a spreading code corresponding to a loop message of the forward loop line region, positioning information of the forward loop region, and loop message decoding information; on the basis of the positioning information of the forward loop region, determining a time at which the train enters the loop region; when the train enters the loop region, the train-mounted device selecting and receiving the corresponding loop message according to the spreading code, and if the prediction information is consistent with the loop identification number in the loop message, then using the loop message decoding information, and decoding the loop message corresponding to the loop region, to obtain real-time forward transponder state and section information. The disclosure is compatible with existing ETCS systems, implements real-time train-to-ground communication, reduces the dependence of a driver on ground signals, eliminates the need to limit speed before crossing a signal, and improves train operation efficiency.

Description

ETCS-based vehicle-ground communication method, vehicle-mounted equipment, ground equipment, and storage medium

[0001] This application claims priority to Chinese Patent Application No. 2024102160916 filed on February 27, 2024, and the contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as a part of this application. Technical Field

[0002] The present invention relates to the field of rail transportation technology, and in particular to an ETCS-based vehicle-ground communication method, vehicle-mounted equipment, ground equipment, and storage medium. Background Art

[0003] Currently, mainstream ETCS on-board systems only support signal information transmitted by transponders at the E1 level. Ground information is often used by the ETCS on-board system in a point-by-point manner. This information transmission mode cannot guarantee the real-time reception of ground information, affecting operational efficiency at the E1 level.

[0004] 1. Unable to meet real-time requirements. Two adjacent balise groups are located a certain distance apart in the section. Between passing the first balise group and the second, there is a gap where the train cannot receive real-time trackside information.

[0005] 2. Impact on E1 train operating efficiency. Before crossing a signal, the train cannot obtain real-time signal changes, so speed limits and visual driving are used to ensure safety. However, this reduces train operating efficiency.

[0006] Summary of the Invention

[0007] In order to solve the above problems, the inventors have made the present invention, and through specific implementation methods, provide a vehicle-ground communication method based on ETCS, a vehicle-mounted device, a ground device and a storage medium.

[0008] In a first aspect, an embodiment of the present invention provides a vehicle-ground communication method based on ETCS, comprising the following steps:

[0009] The train onboard equipment receives the advance information of the loop area ahead sent by the ground transponder, which includes the loop identification number, the spread spectrum code corresponding to the loop message of the loop area ahead, the positioning information of the loop area ahead, and the decoding information of the loop message;

[0010] Determine the time when the train enters the loop area based on the positioning information of the loop area ahead;

[0011] When a train enters the loop line area, the onboard device selects and receives the corresponding loop line message according to the spread spectrum code. If the advance information and the loop line identification number in the loop line message are consistent, the loop line message decoding information is used to decode the loop line message corresponding to the loop line area to obtain the real-time forward transponder status and section information. If they are inconsistent, the onboard device rejects the loop line message.

[0012] When the train leaves the loop line area, it stops receiving loop line messages.

[0013] Specifically, the positioning information of the forward loop area includes the line distance from the current position of the train to the entrance end of the loop area, the length of the loop area, and the direction mark of the loop area.

[0014] Specifically, judging the time when a train enters the loop area according to the positioning information of the preceding loop area includes the following steps:

[0015] Determine the time when the train enters the loop area and the time when the train leaves the loop area based on the line distance from the current train position to the front loop area entrance end, the loop area length, the loop area direction mark and the train speed;

[0016] Whether the train enters the loop area is determined according to the time when the train enters the loop area and the time when the train leaves the loop area.

[0017] Specifically, the vehicle-mounted device selects and receives the corresponding loop message according to the spread spectrum code, including the following steps:

[0018] The antenna unit of the on-board device sends an activation signal to the loop line modem unit of the ground device. When the loop line modem unit is activated, the loop line modem unit sends a loop line message to the antenna unit through the loop line leaky cable. The on-board device identifies the loop line message of the front loop line area according to the spread spectrum code corresponding to the loop line message of the front loop line area. The antenna unit of the on-board device receives the identified loop line message. The loop line transmission module of the on-board device receives the loop line message from the antenna unit. The loop line transmission module decodes the loop line message according to the loop line message decoding information and sends the decoded loop line message to the ETCS core computing unit.

[0019] Specifically, the vehicle-mounted device selects and receives the corresponding loop message according to the spread spectrum code, and further includes the following steps:

[0020] The ground interlocking device sends the loop message to the trackside electronic unit of the ground device, and the trackside electronic unit sends the loop message to the loop modem unit. When the loop modem unit receives the external activation signal and the external power signal, the loop modem unit is activated.

[0021] Specifically, the ETCS-based vehicle-ground communication method further includes the following steps:

[0022] The advance information includes the loop identification number, the spread spectrum code corresponding to the loop message in the forward loop area, the positioning information of the forward loop area, and the loop message decoding information;

[0023] When the current position of the train exceeds or is equal to the entry end position of the front loop area determined by the positioning information of the front loop area, the loop message monitoring timer is started. If a loop message with a loop identification number consistent with the loop identification number in the advance information is not detected within the preset monitoring time, the on-board equipment will apply the brakes to protect the train safety.

[0024] Specifically, the ETCS-based vehicle-ground communication method further includes the following steps:

[0025] The on-board device compares the current message version number recorded in the loop message with the maximum message version number supported by the on-board device. If the current message version number recorded in the loop message exceeds the maximum message version number supported by the on-board device, the on-board device ignores the loop message corresponding to the current message version number.

[0026] In a second aspect, an embodiment of the present invention provides an ETCS-based vehicle-mounted device, comprising an antenna unit, a loop transmission module, and an ETCS core computing unit.

[0027] The on-board device is used to receive the advance information of the front loop line area sent by the ground transponder, the advance information including the loop line identification number, the spread spectrum code corresponding to the loop line message of the front loop line area, the positioning information of the front loop line area, and the loop line message decoding information; according to the positioning information of the front loop line area, the time when the train enters the loop line area is judged; when the train enters the loop line area, the on-board device selects and receives the corresponding loop line message according to the spread spectrum code; if the advance information is consistent with the loop line identification number in the loop line message, the loop line transmission module uses the loop line message decoding information to decode the loop line message corresponding to the loop line area, and sends the decoded loop line message to the ETCS core computing unit to obtain the real-time front transponder status and section information; if they are inconsistent, the on-board device rejects the loop line message; when the train leaves the loop line area, the loop line message is stopped.

[0028] In a third aspect, an embodiment of the present invention provides a ground device based on ETCS, including a transponder group, a loop leaky cable and a loop modem unit.

[0029] The transponder group is used to send the train's front loop area advance information to the train's onboard equipment. The advance information includes the loop identification number, the spread spectrum code corresponding to the front loop area loop message, the front loop area positioning information, and the loop message decoding information;

[0030] The loop line identification number is used to compare with the loop line identification number in the loop line message. If they are consistent, the train decodes the loop line message corresponding to the loop line area according to the loop line message decoding information to obtain the real-time front transponder status and section information. If they are inconsistent, the on-board equipment rejects the loop line message;

[0031] The spread spectrum code is used by the vehicle-mounted device to identify the loop message of the front loop area;

[0032] The positioning information is used to determine the time when the train enters the loop area;

[0033] The loop line modem unit is used to receive the loop line message sent by the wayside electronic unit. When the loop line modem unit receives the external activation signal and the external power supply signal, the loop line modem unit is activated. After the loop line modem unit is activated, the loop line modem unit sends the loop line message to the antenna unit of the train on-board equipment through the loop line leaky cable.

[0034] Based on the same inventive concept, an embodiment of the present invention provides a computer storage medium, wherein the computer storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the aforementioned vehicle-ground communication method based on ETCS is implemented.

[0035] The beneficial effects of the above technical solutions provided by the embodiments of the present invention include at least:

[0036] The present invention uses the existing transponder message processing module, based on the loop area advance information sent by the transponder message, to meet the real-time communication between the train and the ground at a lower cost, and is compatible with the existing ETCS system. After the train passes the transponder that sends the advance information and enters the loop area, it decodes the loop message corresponding to the loop area according to the loop message decoding information, and obtains the new ground information ahead in real time through the loop message, without having to wait for the train to slowly pass the ground signal ahead. Therefore, trains that support the use of loop messages can reduce the driver's dependence on ground signals, reduce the use of ground signals in the loop area, and because it allows trains to run without opening speed, it improves the train operation efficiency.

[0037] Other features and advantages of the present invention will be described in the following description or understood through implementation of the present invention. The purpose and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the written description, claims, and drawings.

[0038] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] FIG1 is a flow chart of a vehicle-ground communication method based on ETCS according to an embodiment of the present invention;

[0041] FIG2 is a schematic diagram of vehicle-ground communication according to an embodiment of the present invention;

[0042] FIG3 is a schematic diagram of the operation mode of the ETCS-1 injected into the European loop line according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a vehicle-ground communication method, vehicle-mounted equipment, ground equipment and storage medium based on ETCS (European Train Control System).

[0045] An embodiment of the present invention provides a vehicle-ground communication method based on ETCS, the process of which is shown in FIG1 and includes the following steps:

[0046] Step S1: The train-mounted equipment receives the advance information of the loop area ahead sent by the ground transponder. The advance information includes the loop identification number, the spread spectrum code corresponding to the loop message of the loop area ahead, the positioning information of the loop area ahead, and the decoding information of the loop message. According to the positioning information of the loop area ahead, the time when the train enters the loop area is determined.

[0047] The forward loop area positioning information includes the line distance from the current train position to the loop area entrance end, the loop area length, and the loop area direction mark.

[0048] The ETCS-based vehicle-to-ground communication provided by the present invention can also promptly detect loop line message reception failures caused by abnormalities in ground loop line equipment, and allow the driver to receive corresponding prompts through the human-machine display interface. Therefore, it is necessary to use the loop line area prediction information in the message packet to accurately determine when the train enters the loop line area. Specifically, based on the positioning information of the preceding loop line area, the time when the train enters the loop line area is determined, including the following steps: based on the line distance from the train's current position to the preceding loop line area entry point, the loop line area length, the loop line area direction indicator, and the train speed, respectively, determining the time when the train enters the loop line area and the time when the train leaves the loop line area; and based on the time when the train enters the loop line area and the time when the train leaves the loop line area, determining whether the train has entered the loop line area.

[0049] Step S2: When the train enters the loop line area, the on-board equipment selects and receives the corresponding loop line message according to the spread spectrum code. If the preview information is consistent with the loop line identification number in the loop line message, the loop line message decoding information is used to decode the loop line message corresponding to the loop line area to obtain the real-time front transponder status and section information. If they are inconsistent, the on-board equipment rejects the loop line message; when the train leaves the loop line area, it stops receiving the loop line message.

[0050] The on-board device selects and receives the corresponding loop message according to the spread spectrum code, including the following steps: the antenna unit of the on-board device sends an activation signal to the loop modem unit of the ground device; when the loop modem unit is activated, the loop modem unit sends the loop message to the antenna unit through the loop leaky cable; the on-board device identifies the loop message of the front loop area according to the spread spectrum code corresponding to the loop message of the front loop area; the antenna unit of the on-board device receives the identified loop message; the loop transmission module of the on-board device receives the loop message from the antenna unit; the loop transmission module decodes the loop message according to the loop message decoding information, and sends the decoded loop message to the ETCS core computing unit.

[0051] The on-board equipment selects and receives the corresponding loop line message according to the spread spectrum code, and also includes the following steps: the ground interlocking equipment sends the loop line message to the trackside electronic unit of the ground equipment, and the trackside electronic unit sends the loop line message to the loop line modem unit. When the loop line modem unit receives the external activation signal and the external power supply signal, the loop line modem unit is activated.

[0052] The vehicle-ground communication method based on ETCS also includes the following steps: the advance information includes the loop line identification number, the spread spectrum code corresponding to the loop line message of the front loop line area, the front loop line area positioning information, and the loop line message decoding information; when the current position of the train exceeds or is equal to the front loop line area entry end position determined by the front loop line area positioning information, the loop line message monitoring timer is started, and if a loop line message with a loop line identification number consistent with the loop line identification number in the advance information is not detected within the preset monitoring time, the on-board equipment performs train safety protection by applying brakes.

[0053] The vehicle-ground communication method based on ETCS also includes the following steps: the on-board device compares the current message version number recorded in the loop message with the maximum message version number supported by the on-board device; if the current message version number recorded in the loop message exceeds the maximum message version number supported by the on-board device, the on-board device ignores the loop message corresponding to the current message version number.

[0054] The aforementioned loop (LOOP) is a signal transmission system. In some specific embodiments, taking the European Loop (EuroLoop) as an example, Euroloop is a semi-continuous, intermittent transmission system that provides signal filling information in advance once the next main signal in the direction of the train is available. The European Loop consists of an on-board functional unit and one or more trackside units. The European Loop system uses the principle of electromagnetic induction, with the loop installed on the trackside and the induction antenna installed on the train as the information transmission medium, and realizes the data interaction function by modulating and demodulating the digital information. It can send the injection information from the leaky cable to the train when the train stops or runs in the section direction. Provide the train with signal information of the next main signal ahead in advance.

[0055] Based on the solution of the present invention, the ETCS train control system is expanded for the European loop trackside equipment. While taking into account the transponder message receiving function, the European loop message receiving function is added to form an ETCS train control system compatible with the European loop subsystem. The overall structure of the European loop subsystem set according to the technical solution of the present invention is shown in Figure 2. The European loop subsystem includes two major parts: the on-board equipment unit (LTM function and antenna unit receiving function) and the ground equipment unit (European loop leaky cable and loop message modem LOOMO). The internal interface of the system includes, from the ground to the on-board equipment, the following in sequence: Interface A sends the European loop message from the ground interlocking from the LEU unit to the loop message modem LOOMO for message modem LOOMO. Interface B is an external activation signal, and interface C activates LOOMO by receiving the activation signal sent by the antenna unit. Interface D is the external power signal interface of LOOMO. When LOOMO is powered on and activated, the loop message can be transmitted to the loop leaky cable through interface E to wait for sending. Interface F then transmits the uplink loop message via the leaky cable to the onboard antenna unit, which receives and decodes it before sending it to the ETCS kernel. The LEU (Lineside Electronic Unit) refers to the trackside electronic unit, and the LTM (Loop Transmission Module) is the loop transmission module of the onboard equipment.

[0056] ETCS-1 level, referred to as E1, adopts a fixed tracking interval format; the driver relies on ground signals to drive, and the equipment before the ground signal generates speed monitoring; the train occupancy and integrity are checked by track circuits or axle counting equipment; query transponders are used to cover the existing signal systems of various countries and are used to locate trains and transmit control commands. The ETCS-1 level system is a typical point-type ATP (Automatic Train Protection). At the E1 level, if the ground signal shows open, the train will not receive this information until it passes the transponder group arranged at the signal. Therefore, the driver needs to observe the ground signal to know when it can move forward, and then allow the train to approach the stop at a speed value lower than the maximum allowable opening speed. This reduces the safety and efficiency of train operation at the E1 level. Figure 3 shows the operation of the ETCS-1 system using the European Loop Line injection scheme proposed in this invention. Through the European Loop Line's information injection, the driver can instantly learn about new information ahead through the loop line information after the train passes the advance balise, without having to wait for the train to slowly pass the ground signal ahead. This means that the signal is optional. This demonstrates that the application of this invention can reduce the installation of ground signals, lowering line construction and maintenance costs. Lines equipped with the loop line can reduce the use of ground signals and, because it allows trains to operate at zero-speed, improve the operating efficiency of the E1 system.

[0057] The present invention enables a train traveling on an E1-level line equipped with European loop line equipment to obtain advance notices of the loop line area ahead, loop line message decoding keys, loop line area length, and other information; after entering the loop line area, it receives loop line messages to update the status of the main transponder ahead and section information in real time; after leaving the loop line area, it resumes the transponder message reception function and disables the loop line message demodulation function of the onboard equipment. Specifically, the present invention builds a European loop line subsystem based on the existing transponder message reading function to realize the function of reading and using transponders and European loop line messages. The implementation process includes:

[0058] 1. The transponder's function of receiving and processing messages remains unchanged;

[0059] 2. Add identification numbers of different European loop areas ahead in the ground transponder message;

[0060] 3. Added positioning information to the ground transponder message to determine the location of the European loop area ahead;

[0061] 4. Added decoding information for modulating and demodulating ground loop messages;

[0062] 5. After the train receives the advance information of the loop area ahead through the transponder, it uses the decoding information in the advance information to parse the loop message sent from the ground after entering the loop area.

[0063] The aforementioned information used to announce the upcoming loop area is stored in the transponder group in the form of a message packet. The message packet contains the following information: loop identification number, spreading code, distance from the current position to the start of the loop area, loop length, and loop direction indicator. Upon entering the loop area, the train first compares the loop identification number in the announcement message with the loop identification number stored in the received Loop message. If the comparison results are inconsistent, the onboard system rejects the corresponding loop message. Depending on the different ground loop equipment (LOOOMO), the spreading code is assigned different values ​​and sent to the onboard system. The decoded information in the announcement message is then sent by the onboard system to the loop transmission module (LTM in Figure 2). The loop message receiving unit (LOOP Receive) in the LTM then receives the loop message that matches the spreading code. The length and distance information of the announced loop area in the message packet serves as auxiliary information for monitoring loop message reception after the train enters the loop area. This enables support for parsing, receiving, and utilizing messages from ground European loop equipment.

[0064] Specifically, the implementation process of abnormal message monitoring in the loop area includes: receiving and recording the information of the predicted loop position in the transponder group, receiving and recording the identification number of the predicted loop area in the transponder group, and when the current position of the train is greater than or equal to the recorded starting position of the loop area, starting the loop message monitoring timer. If the loop message with the corresponding identification number is not detected within 3 seconds, the on-board system applies common braking for safety protection.

[0065] To promptly detect loop message reception failures caused by ground loop device anomalies, loop message version management is also required. Loop messages contain the current message version number. The onboard system receives and records this information and compares it with the maximum message version number supported by the onboard system. If the current loop message version number is within the message version number range supported by the onboard system, the onboard device will support parsing and use the loop message. If the current loop message version number is greater than the maximum message version number supported by the onboard system, the onboard device will ignore the loop message with that version number.

[0066] In the above method of this embodiment, the present invention continues to use the existing transponder message processing module, based on the loop area advance information sent by the transponder message, to meet the real-time communication between the train and the ground at a lower cost, and is compatible with the existing ETCS system. After the train passes the transponder that sends the advance information and enters the loop area, it decodes the loop message corresponding to the loop area according to the loop message decoding information, and obtains the new ground information ahead in real time through the loop message, without waiting for the train to slowly pass the ground signal ahead. Therefore, trains that support the use of loop messages can reduce the driver's dependence on ground signals, reduce the use of ground signals in the loop area, and because it allows the train to run without opening speed, it improves the train operation efficiency.

[0067] Those skilled in the art can change the above sequence without departing from the scope of protection of the present disclosure.

[0068] Another embodiment of the present invention provides an ETCS-based vehicle-mounted device, comprising an antenna unit, a loop transmission module, and an ETCS core computing unit.

[0069] The on-board device is used to receive the advance information of the front loop line area sent by the ground transponder, the advance information including the loop line identification number, the spread spectrum code corresponding to the loop line message of the front loop line area, the positioning information of the front loop line area, and the loop line message decoding information; according to the positioning information of the front loop line area, the time when the train enters the loop line area is judged; when the train enters the loop line area, the on-board device selects and receives the corresponding loop line message according to the spread spectrum code; if the advance information is consistent with the loop line identification number in the loop line message, the loop line transmission module uses the loop line message decoding information to decode the loop line message corresponding to the loop line area, and sends the decoded loop line message to the ETCS core computing unit to obtain the real-time front transponder status and section information; if they are inconsistent, the on-board device rejects the loop line message; when the train leaves the loop line area, the loop line message is stopped.

[0070] In this embodiment, the present invention uses the existing transponder message processing module, based on the loop area advance information sent by the transponder message, to meet the real-time communication between the train and the ground at a lower cost, and is compatible with the existing ETCS system. After the train passes the transponder that sends the advance information and enters the loop area, it decodes the loop message corresponding to the loop area according to the loop message decoding information, and obtains the new ground information ahead in real time through the loop message, without waiting for the train to slowly pass the ground signal ahead. Therefore, trains that support the use of loop messages can reduce the driver's dependence on ground signals, reduce the use of ground signals in the loop area, and because it allows trains to run without opening speed, it improves the train operation efficiency.

[0071] Another embodiment of the present invention provides a ground device based on ETCS, including a transponder group, a loop leaky cable and a loop modem unit.

[0072] The transponder group is used to send the train's front loop area advance information to the train's onboard equipment. The advance information includes the loop identification number, the spread spectrum code corresponding to the front loop area loop message, the front loop area positioning information, and the loop message decoding information;

[0073] The loop line identification number is used to compare with the loop line identification number in the loop line message. If they are consistent, the train decodes the loop line message corresponding to the loop line area according to the loop line message decoding information to obtain the real-time front transponder status and section information. If they are inconsistent, the on-board equipment rejects the loop line message;

[0074] The spread spectrum code is used by the vehicle-mounted device to identify the loop message of the front loop area;

[0075] The positioning information is used to determine the time when the train enters the loop area;

[0076] The loop line modem unit is used to receive the loop line message sent by the wayside electronic unit. When the loop line modem unit receives the external activation signal and the external power supply signal, the loop line modem unit is activated. After the loop line modem unit is activated, the loop line modem unit sends the loop line message to the antenna unit of the train on-board equipment through the loop line leaky cable.

[0077] In this embodiment, the present invention uses the existing transponder message processing module, based on the loop area advance information sent by the transponder message, to meet the real-time communication between the train and the ground at a lower cost, and is compatible with the existing ETCS system. After the train passes the transponder that sends the advance information and enters the loop area, it decodes the loop message corresponding to the loop area according to the loop message decoding information, and obtains the new ground information ahead in real time through the loop message, without waiting for the train to slowly pass the ground signal ahead. Therefore, trains that support the use of loop messages can reduce the driver's dependence on ground signals, reduce the use of ground signals in the loop area, and because it allows trains to run without opening speed, it improves the train operation efficiency.

[0078] Based on the same inventive concept, an embodiment of the present invention provides a computer storage medium, wherein the computer storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the aforementioned vehicle-ground communication method based on ETCS is implemented.

[0079] Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. A vehicle-ground communication method based on ETCS, characterized in that: The following steps are involved: The train onboard equipment receives the advance information of the loop area ahead sent by the ground transponder, which includes the loop identification number, the spread spectrum code corresponding to the loop message of the loop area ahead, the positioning information of the loop area ahead, and the decoding information of the loop message; Determine the time when the train enters the loop area based on the positioning information of the loop area ahead; When a train enters the loop line area, the onboard device selects and receives the corresponding loop line message according to the spread spectrum code. If the advance information and the loop line identification number in the loop line message are consistent, the loop line message decoding information is used to decode the loop line message corresponding to the loop line area to obtain the real-time forward transponder status and section information. If they are inconsistent, the onboard device rejects the loop line message. When the train leaves the loop line area, it stops receiving loop line messages.

2. The method according to claim 1, wherein The forward loop area positioning information includes the line distance from the current train position to the loop area entrance end, the loop area length, and the loop area direction mark.

3. The method according to claim 1, wherein Determining the time when a train enters the loop area based on the positioning information of the preceding loop area includes the following steps: Determine the time when the train enters the loop area and the time when the train leaves the loop area based on the line distance from the current train position to the front loop area entrance end, the loop area length, the loop area direction mark and the train speed; Whether the train enters the loop area is determined according to the time when the train enters the loop area and the time when the train leaves the loop area.

4. The method according to claim 1, wherein The vehicle-mounted device selects and receives the corresponding loop message according to the spread spectrum code, including the following steps: The antenna unit of the on-board device sends an activation signal to the loop line modem unit of the ground device. When the loop line modem unit is activated, the loop line modem unit sends a loop line message to the antenna unit through the loop line leaky cable. The on-board device identifies the loop line message of the front loop line area according to the spread spectrum code corresponding to the loop line message of the front loop line area. The antenna unit of the on-board device receives the identified loop line message. The loop line transmission module of the on-board device receives the loop line message from the antenna unit. The loop line transmission module decodes the loop line message according to the loop line message decoding information and sends the decoded loop line message to the ETCS core computing unit.

5. The method according to claim 1, wherein The vehicle-mounted device selects and receives the corresponding loop message according to the spread spectrum code, and further includes the following steps: The ground interlocking equipment sends the loop message to the trackside electronic unit of the ground equipment, and the trackside electronic unit sends the loop message to the trackside electronic unit. The signal is sent to the loop modem unit. When the loop modem unit receives the external activation signal and the external power supply signal, the loop modem unit is activated.

6. The method according to claim 1, wherein The ETCS-based vehicle-ground communication method further includes the following steps: The advance information includes the loop identification number, the spread spectrum code corresponding to the loop message in the forward loop area, the positioning information of the forward loop area, and the loop message decoding information; When the current position of the train exceeds or is equal to the entry end position of the front loop area determined by the positioning information of the front loop area, the loop message monitoring timer is started. If a loop message with a loop identification number consistent with the loop identification number in the advance information is not detected within the preset monitoring time, the on-board equipment will apply the brakes to protect the train safety.

7. The method according to claim 1, wherein The ETCS-based vehicle-ground communication method further includes the following steps: The on-board device compares the current message version number recorded in the loop message with the maximum message version number supported by the on-board device. If the current message version number recorded in the loop message exceeds the maximum message version number supported by the on-board device, the on-board device ignores the loop message corresponding to the current message version number.

8. An ETCS-based vehicle-mounted device, characterized in that: Including antenna unit, loop transmission module and ETCS core computing unit, The vehicle-mounted device is used to receive the front loop area warning information sent by the ground transponder, the warning information including the loop identification number, the spread spectrum code corresponding to the front loop area loop message, the front loop area positioning information, and the loop message decoding information; Determine the time when the train enters the loop area based on the positioning information of the loop area ahead; When the train enters the loop line area, the on-board equipment selects and receives the corresponding loop line message according to the spread spectrum code. If the advance information is consistent with the loop line identification number in the loop line message, the loop line transmission module uses the loop line message decoding information to decode the loop line message corresponding to the loop line area, and sends the decoded loop line message to the ETCS core computing unit to obtain the real-time status of the front transponder and section information. If they are inconsistent, the on-board equipment rejects the loop line message; when the train leaves the loop line area, it stops receiving the loop line message.

9. A ground equipment based on ETCS, characterized in that: Including transponder group, loop leaky cable and loop modem unit, The transponder group is used to send the train's front loop area advance information to the train's onboard equipment. The advance information includes the loop identification number, the spread spectrum code corresponding to the front loop area loop message, the front loop area positioning information, and the loop message decoding information; The loop line identification number is used to compare with the loop line identification number in the loop line message. If they are consistent, the train will Decoding information, decoding the loop message corresponding to the loop area, obtaining the real-time state of the front transponder and the section information, if they are inconsistent, the on-board device rejects the loop message; The spread spectrum code is used by the vehicle-mounted device to identify the loop message of the front loop area; The positioning information is used to determine the time when the train enters the loop area; The loop line modem unit is used to receive the loop line message sent by the wayside electronic unit. When the loop line modem unit receives the external activation signal and the external power supply signal, the loop line modem unit is activated. After the loop line modem unit is activated, the loop line modem unit sends the loop line message to the antenna unit of the train on-board equipment through the loop line leaky cable.

10. A computer storage medium, characterized in that The computer storage medium stores computer-executable instructions, which, when executed, implement the vehicle-to-ground communication method based on ETCS according to any one of claims 1 to 7.

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