CN114268926A

CN114268926A - BTM system with high-reliability framework

Info

Publication number: CN114268926A
Application number: CN202210103995.9A
Authority: CN
Inventors: 边兴田; 牟海涛; 寇永砺
Original assignee: Beijing Jiaoda Signal Technology Co Ltd
Current assignee: Beijing Jiaoda Signal Technology Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-04-01
Anticipated expiration: 2042-01-27
Also published as: CN114268926B

Abstract

The BTM system of the high-reliability architecture of the present invention is composed of a BTM host, a BTM antenna and a low-frequency cable; part of the analog circuit on the existing BTM host is displaced into the BTM antenna, and the low-frequency cable is used to replace the existing The low-frequency cable consists of redundant power lines, ground lines and redundant TA transmission lines. The technical advantages of the present invention: this kind of structure design can directly avoid the interference of the vehicle body environment on the BTM transmission path, and the signal transmitted by the cable is a low-frequency signal, and the transmission distance is longer, and is not limited by the wavelength of the transmission signal, and the length of the cable can be adjusted. Reasonable design according to locomotive installation conditions. At the same time, this architecture improves the flexibility of the BTM antenna antenna arrangement, and can extend a variety of BTM usage forms.

Description

BTM system with high-reliability framework

Technical Field

The invention relates to a high-reliability BTM system with an improved architecture.

Background

The BTM system in the market at present comprises a BTM host, a BTM antenna and an antenna cable, wherein when the BTM antenna activates a transponder, message information sent by the transponder is received, an analog FSK signal is transmitted to the BTM host through a coaxial cable, and after the FSK signal is processed by the host, the message information of the transponder is output to the vehicle-mounted train control system.

As shown in fig. 1, in the conventional BTM system, a coaxial cable is mostly used for signal transmission between an antenna and a host, the host transmits a 27M energy signal for activating the antenna through the coaxial cable, and the host receives a message 4M FSK signal sent by a transponder through the coaxial cable, so that the coaxial cable has high cost, and the cable simultaneously transmits the 27M energy signal and the 4M FSK signal, which are easily interfered by the environment and fail in the current installation environment of a locomotive, and the coaxial cable directly causes BTM function failure after failure. In addition, since 27M high frequency energy signals are transmitted, the length of the coaxial cable is limited by the wavelength, and the length of the cable must be an integral multiple of half wavelength, thereby causing cable waste.

Disclosure of Invention

The invention provides a BTM system with a high-reliability framework aiming at the defects that the existing BTM system is easily interfered by the environment of a vehicle body, limited by the transmission distance of a coaxial cable and the like.

The invention provides a BTM system with a high-reliability framework, which consists of a BTM host, a BTM antenna and a low-frequency cable;

the BTM system partially displaces the analog circuitry on the existing BTM host into the BTM antenna, while replacing the existing coaxial cable with the low frequency cable,

the low-frequency cable penetrates through the vehicle body to be connected with the BTM host and the BTM antenna and is responsible for providing a working power supply of the antenna and a transmission function of the TA code demodulated by the BTM antenna;

the low-frequency cable consists of a redundant power line, a redundant ground line and a redundant TA transmission line;

the low-frequency cable is not subjected to high-frequency signal transmission, is not easily interfered by space high-frequency signals, and is not limited by the wavelength of transmission signals, so that the length of the cable can be reasonably designed according to the installation conditions of the locomotive.

The invention has the technical advantages that: the structure design can directly avoid the interference of the vehicle body environment on the BTM transmission path, the signal transmitted by the cable is a low-frequency signal, the transmission distance is farther and is not limited by the wavelength of the transmission signal, and the length of the cable can be reasonably designed according to the installation condition of the locomotive. Meanwhile, the structure improves the flexibility of BTM antenna arrangement, and can extend various BTM using forms, such as double-antenna single-end redundancy and double-antenna head-tail redundancy structures.

Drawings

FIG. 1 is a diagram of a prior art BTM system architecture;

FIG. 2 is a block diagram of a BTM system of the present invention;

FIG. 3 is a schematic diagram of a conventional use of the BTM system of the present invention;

FIG. 4 is a schematic diagram of a dual antenna single ended redundancy application of the BTM system of the present invention;

FIG. 5 is a schematic diagram of dual antenna head and tail redundancy application of the BTM system of the present invention;

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

A BTM with an existing architecture, as shown in fig. 1, wherein a BTM host is disposed in a signal cabinet, the host includes a power module, a driving module, a demodulation module, and a decoding communication module, wherein the driving module provides a 27M energy driving amplification function for an antenna, the demodulation module is responsible for receiving a 4M FSK signal and demodulating the signal, and modulates the signal into a low-frequency TA code signal, and the decoding communication module converts the received TA code into a user packet and transmits the user packet to a vehicle-mounted train control system, wherein the driving module and the demodulation module are constructed by an analog circuit, and the decoding communication module is generally composed of programmable devices, and is easily interfered by an external environment, and has a lower reliability than the analog circuit. The invention transplants the analog circuit part with higher reliability such as driving and demodulation in the host of the architecture of figure 1 into the antenna through the detailed evaluation of the system reliability and the cost of the existing architecture BTM, and the host keeps the decoding communication function.

The BTM system comprises a BTM host, a BTM antenna and a low-frequency cable, wherein part of functions of an analog circuit on the BTM host are transplanted to the BTM antenna, and the low-frequency cable is responsible for providing an antenna working power supply and receiving the transmission function of a TA code demodulated by the BTM antenna, and the structure of the BTM system is shown in figure 2.

The A1/A4 interface is an interface between the BTM system and the ground transponder, and the B interface is an interface between the BTM and the vehicle train control system and is used for communication between the BTM and the vehicle train control system.

BTM antenna: the BTM antenna is arranged on a bogie of a locomotive body or the bottom of the locomotive body. The BTM antenna comprises a driving module and a demodulation module, wherein the driving module provides a 27M energy driving amplification function for the antenna, outputs the energy driving amplification function through an A4 interface and is used for activating a ground transponder, and the demodulation module is used for receiving an A1 interface signal, demodulating the signal and modulating an A1 signal into low-frequency TA1 and TA2 signals.

Low-frequency cables: run through automobile body and connect BTM host computer and BTM antenna, by redundant power cord 1,2, ground wire and redundant TA transmission line 1,2 are constituteed, wherein the BTM host computer passes through power cord 1,2 and supplies power for the BTM antenna, and TA transmission line 1,2 are antenna transmission TA sign indicating number to the BTM host computer. The low-frequency cable is not subjected to high-frequency signal transmission, is not easily interfered by space high-frequency signals, and is not limited by transmission signal wavelength, so that the length of the cable can be reasonably designed according to locomotive installation conditions. In addition, because the coaxial cable of the existing architecture is designed in a single-path mode, once a single-point fault (such as short circuit and open circuit) occurs, the whole BTM fails, and after the BTM is replaced by a low-frequency cable, the single-point fault does not affect the normal operation of the BTM system because the BTM comprises a redundant communication line design.

The BTM host machine comprises: the signal transmission device is placed in a signal cabinet on a vehicle, receives TA1 and TA2 code elements sent by a BTM antenna through a low-frequency cable, decodes the TA code and transmits the TA code to a vehicle-mounted signal system through a B interface.

The application of the low-frequency cable enables the cable and the antenna to be distributed more flexibly, and the analog circuit is partially integrated into the antenna, so that the interference sensitivity of the antenna to the vehicle body space and the line is greatly reduced, and the antenna is convenient to be arranged in more spaces under the vehicle body.

When the BTM system is actually used, the host adopts a single set, the antenna and the low-frequency cable can be selected in a plurality of ways according to the field use scene, and the following description is combined with a specific example.

FIG. 3 is a schematic diagram (within the dashed box) of a BTM of the present invention in a conventional use configuration. The mode is conventional use, the BTM host computer is installed in the locomotive signal rack, the BTM antenna is installed below the locomotive, and the low frequency cable passes through the automobile body and connects the BTM host computer and the BTM antenna.

The application scene has the beneficial effects that: the risk that the BTM is interfered by the vehicle body in the process of transmitting the information of the transponder is reduced, the distance of the cable for transmitting the message of the transponder is increased, and meanwhile, the transmission cost of the cable is reduced.

FIG. 4 is a schematic diagram (within the dashed box) of the BTM dual antenna single ended redundancy application of the present invention. The BTM host is arranged in a signal cabinet of a vehicle head, two BTM antennas are respectively arranged below the vehicle head, the center distance of the double antennas is more than 8 meters, a low-frequency cable penetrates through a vehicle body to connect the BTM host and the BTM antennas, and the double antennas can be used for cold standby and hot standby.

In the BTM operation process, when one antenna fails, the other antenna can be switched to work in time. Providing availability of the BTM system.

The application scene has the beneficial effects that: when having reduced BTM transmission transponder information in-process automobile body interference risk, satisfied BTM dual antenna redundancy function, reduced the losing a little risk that single-point BTM became invalid and lead to in the BTM operation process.

FIG. 5 is a schematic diagram (within the dashed box) of the BTM dual antenna head and tail redundancy application of the present invention. The BTM host is arranged in a signal cabinet of a vehicle head, two BTM antennas are respectively arranged below the vehicle head and the vehicle tail, a low-frequency cable penetrates through a vehicle body to be connected with the BTM host and the BTM antennas, and the double antennas work simultaneously.

In the operation process of the BTM, the BTM host outputs the processed transponder information received by the two ends to a vehicle-mounted signal system through the head-tail end antenna.

The application scene has the beneficial effects that: head and tail end antenna information gathers the BTM host computer, carries out the redundant processing back of locomotive rear of a vehicle information by the BTM host computer, transmits for on-vehicle signal equipment, and respectively arranges a BTM host computer and on-vehicle signal equipment with traditional head and tail end and realizes that head and tail end redundant mode compares, has reduced on-vehicle signal system equipment complexity, has promoted BTM throughput when simplifying on-vehicle signal equipment function.

The technical advantages of the high-reliability architecture BTM of the invention are as follows:

the risk of vehicle body interference in the process of transmitting the transponder information by the BTM is reduced, and the reliability of the BTM is improved;

the application of the low-frequency cable enables the distribution of the cable and the antenna to be more flexible, and the simulation part is integrated into the antenna, so that the interference sensitivity of the antenna to the vehicle body space and the line is greatly reduced, and the antenna can be conveniently arranged in more spaces under the vehicle body;

the BTM host only carries out decoding communication, the digital functions are highly concentrated, and the number of the BTM host only needs one, so that the complexity of the BTM host structure is reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A BTM system with a high reliability framework is composed of a BTM host, a BTM antenna and a low-frequency cable;

2. The BTM system of claim 1, wherein the low frequency cable comprises redundant TA transmission lines, and wherein due to the redundant communication line design, normal operation of the BTM system is not affected even by a single point of failure, relative to a coaxial cable of an existing single-pass design.

3. A BTM system according to claim 1, wherein the analog circuit portion displaced into the BTM antenna comprises a driver module providing 27M energy-driven amplification for the BTM antenna and a demodulator module responsible for receiving and demodulating a 4M FSK signal and modulating the signal into a low frequency TA code signal.

4. The BTM system of claim 3, wherein the BTM host is placed in a signal cabinet on a vehicle, and comprises only a power supply module and a decoding communication module, wherein the TA code sent by the BTM antenna is received through the low frequency cable, and the decoding communication module converts the received TA code into a user message and transmits the user message to a train control system on the vehicle.

5. The BTM system according to claim 1, wherein the BTM host computer is a single set when the BTM system is actually used, and the BTM antenna and the low frequency cable can be selectively arranged according to field use scenes, such as a single antenna or a redundant dual antenna.

6. The BTM system of claim 5, wherein the redundant dual antenna comprises single ended redundancy and head-to-tail redundancy.

7. The BTM system of claim 6, wherein the single-ended redundancy means that the BTM host is installed in a signal cabinet of a vehicle head, two BTM antennas are installed below the vehicle head respectively, the center distance of the double antennas is greater than 8 meters, the low-frequency cable penetrates through a vehicle body to connect the BTM host and the BTM antennas, the double antennas can be used for cold standby and hot standby, and when one antenna fails in the BTM operation process, the other antenna can be switched to work in time.

8. The BTM system according to claim 6, wherein the head and tail end redundancy means that the BTM host is installed in a head signal cabinet, the two BTM antennas are respectively installed below a head and a tail, a low-frequency cable penetrates through a vehicle body to connect the BTM host and the BTM antennas, the two antennas work simultaneously, head and tail end antenna information is collected to the BTM host, and the BTM host performs head and tail end information redundancy processing and then transmits the information to a vehicle-mounted train control system.