RU2588394C1 - Method of transmitting information over radio link when driving train with distributed along its length locomotives at double-track motion and device therefor - Google Patents

Abstract

FIELD: transport; communication device.

SUBSTANCE: group of inventions relates to automation and communication on railway transport. Proposed device comprises adaptive wireless modem, locomotive control system, time distributor and antenna-feeder device installed on locomotive. Note here that time distributor comprises signal receiver, signal generator, spectrum and signal level analyser, threshold device, buffer device, up and down train frequency finder, frequency synthesiser and comparator unit.

EFFECT: higher reliability of data transmission.

2 cl, 2 dwg

Description

The group of inventions relates to the field of automation, communication and computer technology, in particular to radio communications in railway transport, and can find application in technological processes for controlling trains with locomotives distributed along its length.

A known method of dynamic distribution of channels for sectorized radio access systems of a radio communication system with moving objects, which consists in adaptive selection in each of these sectors of the transmission of a free radio channel from the set of common radio channels, which, after selecting it, can be reused in the same access radio device, but which is individual for a given connection of a radio communication line in a given transmission sector (RU 97110163 A, Н0 47/36, 05.27.1999).

It is known a radio access device for establishing connections of a radio communication line with mobile objects, comprising a transceiver, a control unit and an antenna unit operatively connected to provide a plurality of common radio channels in the transmission sectors divided by directions, said radio transceiver, control unit and antenna unit being configured to work together with remote long-distance communication devices in the transmission sector (RU 97110163 A, Н04 7/36, 05.27.1999).

The disadvantage of this method and device that implements it is that the choice of the optimal operating frequency of the radio access device is carried out without taking into account the detuning from industrial broadband and concentrated radio interference and from radio stations of railway technological radio communication networks.

The closest technical solution in terms of the method is a method of transmitting information over a radio channel while driving a train with locomotives distributed along its length, implemented using a known device for controlling connected trains over a radio channel, which consists in periodically analyzing the signal level and its changes in the main group the radio frequencies of the locomotives of the connected train of the oncoming direction and provide the maximum separation by radio frequencies during the passage of the oncoming connection train on the adjacent track (RU 2398729 C1, B66C 17/12, 09/10/2010).

The closest technical solution in terms of the device is a device for controlling connected trains over a radio channel, containing a locomotive radio station for train radio communications, a locomotive control system and an adaptive radio modem including an antenna-feeder device and a transmitter, a modem connected to telecontrol channels - a telealarm system with a locomotive radio station is inserted into the device and a locomotive control system, and the adaptive radio modem further comprises a control signal receiver, broadband a receiver, a spectrum analyzer, a program unit, a radio frequency synthesizer, wherein the first output of the antenna-feeder device is connected to the input of the broadband receiver, the second output is connected to the input of the control signal receiver, the first output of which is connected to the input of the locomotive control system, and the second output is connected to the second the input of the spectrum analyzer, the output of the broadband receiver is connected to the first input of the spectrum analyzer, the output of which is connected to the input of the program unit, the output of which is connected to the synthesizer input and radio frequencies, the first output of which is connected to the first input of the transmitter, the second input of the transmitter is connected to the output of the control system, the second output of the radio frequency synthesizer is connected to the input of the control signal receiver, the third output of the radio frequency synthesizer is connected to the input of the broadband receiver (RU 2398729, B66C 17/12, 2010.09.10).

This device provides automatic tuning of the radio modem to one of the group of allocated frequencies of even or odd directions, while taking into account the frequency interval relative to the already occupied frequencies, i.e. This system provides optimal frequency separation of channels within the frequency band of the corresponding direction.

However, the system will work stably at certain signal levels, taking into account the standard two-frequency selectivity of radio modems, equal to 70 dB.

The known invention does not take into account the appearance of signal levels significantly exceeding the value of two-signal selectivity, for example, when an oncoming train with locomotives distributed along its length passes on a double-track section.

In this case, suppression (failure) of the commands occurs during their simultaneous transmission (transmission of commands within each train) and the exchange of information between the master and slave locomotives located in the zone when the signals from the control systems of the oncoming train exceed the selectivity of the existing receivers in the radio modems. Thus, the presence of only the frequency spacing of the radio channels of trains of even and odd directions does not ensure the stable operation of locomotive control systems in double-track sections when they converge.

The problem solved by the proposed method and device for transmitting information over a radio channel when driving trains with locomotives distributed along its length during double-track movement is to increase the reliability of data transmission and the stability of control systems when external influences occur along the train along with locomotives distributed along its length due to the introduction of a temporary separation of the transmission of control commands between trains of oncoming directions.

The technical result consists in increasing the reliability of data transmission and the stability of the control when external influences occur along the route of a train with locomotives distributed along its length.

In terms of the method, the technical result is achieved by the fact that in the method of transmitting information over the air when driving a train with locomotives distributed along its length during double-track movement, which consists in the fact that when a train meets a train with locomotives distributed along its length, they carry out the frequency separation of the remote control signals and telesignals relative to the frequencies of telecontrol signals and telesignals of an oncoming train, according to the invention, telecontrol signals and train alarms are transmitted during the absence of Television remote control signal transmission and signaling oncoming trains.

In terms of the device, the technical result is achieved in that in the device for transmitting information over the radio channel when driving trains with locomotives distributed along its length, containing an adaptive radio modem and a locomotive control system located on the locomotives of the train, according to the invention, an antenna-feeder device is additionally installed on each locomotive, connected by an input / output with an adaptive radio modem, a time distributor including a series-connected signal receiver, a spectrum analyzer a signal level, a threshold device and a signal conditioner, the first input / output of which is connected to another output / input of the adaptive radio modem, a buffer device connected between the second input / output of the signal conditioner and the output / input of the locomotive control system, the frequency determiner of the even and of odd directions and a frequency synthesizer connected to the second input of the signal receiver by an output, a comparison unit connected to the second output of the spectrum analyzer and signal level by an input, and in move - to another input of the frequency synthesizer, wherein the input frequency of the determinant of the even and odd lines is connected to an engine output control system, the signal receiver input coupled to the output of antenna-feeder device.

The essence of the proposal is illustrated by the drawings shown in FIG. 1 and FIG. 2.

In FIG. 1 is a structural diagram of an embodiment of a device for transmitting information over a radio channel when driving trains with locomotives distributed along its length, realizing the proposed method, FIG. 2 - zones of mutual influence on the transmission channels between the driven and leading locomotives of the connected trains of even and odd directions.

A device for transmitting information over a radio channel while driving a train with locomotives distributed along its length comprises an adaptive radio modem 1 mounted on the master and slave locomotives of the train, a locomotive control system 2, a temporary signal distributor 3, including an antenna-feeder device 4 connected to the adaptive input / output device 4 a radio modem 1, a signal receiver 5 connected in series, a spectrum and signal level analyzer 6, a threshold device 7 and a signal driver 8, the first input / output of which is connected it is connected to another output / input of the adaptive radio modem 1, a buffer device 9 connected between the second input / output of the signal shaper 8 and the output / input of the locomotive control system 2, the frequency determiner 10 of even and odd directions and the frequency synthesizer 11 connected in series with the second the input of the receiver 5 signals, block 12 comparison, the input connected to the second output of the analyzer 6 of the spectrum and signal level, and the output to another input of the synthesizer 11 frequencies, while the input of the determinant 10 frequencies even and odd directions connected to the output of the locomotive control system 2, the input of the signal receiver 5 is connected to the output of the antenna-feeder device 4.

As an example of the implementation of the proposed method, an example of using a device for transmitting information over a radio channel while driving a connected train, which contains locomotives distributed along its length, is presented.

In the case when the joint venture stands - (V = 0) and its locomotives exchange control commands, and in the odd direction the joint venture passes at a speed of V = 60 km / h (see Fig. 2a), when the oncoming train approaches over a distance of about 500 m, it is possible to suppress the vehicle signal on locomotives of an even-directional train, since the exchange of information within each train is random. Moreover, in accordance with the established standards, the two-frequency selectivity of radio modems 1 can be 70 dB. Under these conditions, it is possible to suppress a radio signal when locomotives approach each other by less than 500 m. The maximum approximation of locomotives is 5 m, which determines the danger of signal suppression in the entire spectrum of radio frequencies.

~ 500 meters before the trains approach the adaptive radio modems of the 1 leading locomotives of the joint venture, signals of their control systems of ~ 70 dB (Fig. 2a) are perceived and reach their maximum of ~ 140 dB when their leading locomotives meet (Fig. 2b). The magnitude of the mutual influence is above the threshold level of 70 dB all the time, while there is an intra-train exchange of information between the master and slave locomotives in each joint venture. When the leading locomotive of the joint venture of odd direction meets the driven locomotive of the joint venture of even direction and the driven locomotive of even direction of the joint venture with the lead locomotive of the joint odd direction (Fig. 2c) with active intra-train information transfer, the magnitude of the mutual influence of train signals can also reach its maximum.

During the period of removal of oncoming trains, this influence will still affect until the meeting of the driven locomotive of the joint venture of odd direction with the driven locomotive of the joint venture of even direction (Fig. 2d) and gradually weaken when the driven (pushing) locomotives of trains are removed by a distance of ~ 500 m to the threshold value (Fig. . 2d).

Thus, with the total length of the joint venture equal to 2 km, with the driven locomotive in the middle of the train, and the speed of movement V = 60 km / h, the time during which the control commands fail due to mutual influence can be 3 minutes, and when the presence of a pushing locomotive in the tail of the train - 5 minutes.

During this time, according to the proposed method, during the oncoming SP on the double-track path, the radio-frequency signals and the telesignalization of trains of even and odd directions of traffic are separated by radio frequencies and, in addition, their transmission in time is separated.

When forming a joint venture, the drivers of the lead and slave trains turn on the radio modems 1 and set the train number in the automatic control system 2 of the connected train, assigned and transmitted to the driver of the lead locomotive by the dispatcher (station duty). In automatic mode, depending on the assigned train number of an even or odd direction, respectively, an even or odd frequency group of eight radio frequencies is set in the radio modem, which is divided into two quadruples - the primary and secondary. The radio modem 1 of the lead locomotive scans the radio frequencies of the main four and selects a free radio channel to establish communication with the slave locomotive. When a radio channel is established between the locomotives of the joint venture, the radio modems 1 go into the operating mode of the control system 2 of the connected train with the transmission of telecontrol and tele-signaling commands.

In the absence of an oncoming connected train, the adaptive radio modem 1 of the leading locomotive SP provides the operating mode of the control system 2 of the connected train with the transmission of telecontrol and telealarm commands through the buffer device 9 and the signal shaper 8 without delay in time.

Periodically adaptive radio modem 1 analyzes the signal level and its changes.

When passing an oncoming connected train, the adaptive radio modem 1 determines the main group of frequencies of the radio channel of the information exchange between the locomotives of the connected train of the oncoming direction and provides the maximum separation of the frequencies of the radio channel of the information exchange between locomotives relative to the frequencies of the radio channel of the information exchange between the locomotives of the oncoming train. However, the transmission of remote control and tele-signaling commands by the radio modem 1 takes into account the time delay determined by the time distributor 3.

The time distributor 3 analyzes the signals in the frequency group of the oncoming train. Why, the frequency determiner 10 receives information from the locomotive control system 2 about what frequencies the synthesizer 11 should be switched to. The synthesizer 11 sequentially tunes the receiver 5 to the frequencies of the information exchange signals between the locomotives of the oncoming train.

Through the antenna-feeder device 4 of the leading locomotive of the connected train, the radio signals of various sources of radiation and external interference arrive at the broadband receiver 5 of the time divider. The receiver 5, tuned to the frequency of the information exchange signals between the oncoming train locomotives, registers the signals from the oncoming train and sends them to the analyzer 6, which analyzes the spectrum and levels of the radio signals.

The analyzer 6 sends the results of the analysis to the comparison unit 12, which constantly compares the sequentially incoming radio signals, determining the dynamics of the signal by level and frequency. With a constant increase in the level of one of the received radio signals and reaching a certain value, for example, 60 dB, block 12 stops the comparison, registers the radio signal of this frequency as the frequency of the information exchange channel between oncoming train locomotives, and sends information about it to the synthesizer 11.

Synthesizer 11 tunes the receiver 5 to the frequency of the information exchange channel between the locomotives of the oncoming train.

The analyzer 6 analyzes the spectrum and signal level of the information exchange channel between the locomotives of the oncoming train. The analyzer sends the results of the analysis to the threshold device 7.

Upon reaching the level of the controlled radio signal threshold value, for example, 80 dB, exceeding the two-signal selectivity, the device 7 sends a command to the shaper 8 to introduce a time delay for transmitting telecontrol signals from the buffer device 9 to the input of the adaptive radio modem 1 and the buffer device 9 receiving the signal from the adaptive radio modem 1 telealarm. The time delay is determined by the transmission time of the TU and TS signals to the oncoming SP. The structure of the commands transmitted by the leading locomotive contains groups of continuous signals of command information interrupted by pauses of a certain length.

At the oncoming joint venture, similar operations are carried out to transmit information. As a result of this, the time decoupling between the TU-TS signals of the oncoming SP trains is tracked in the synthesizer 7 of the time distributor. In the pauses between the signals of the oncoming train radio transmitter, when the level of the interfering signals drops sharply, the frequency synthesizer 11 removes the ban on the signal delay in the driver 8 and the information from the locomotive control system is transmitted to the input of the adaptive radio modem 1, ensuring the transmission sequence of the locomotive signals of trains of even and odd directions.

Thus, in a connected train, in addition to the frequency division of command transmission between trains of even and odd directions, time-division of command transmission is carried out, which are transmitted by adaptive radio modem 1, which significantly reduces the level of mutual interference, improves the quality of signals perceived by driven locomotives and improves the safety of control of connected , long and heavy trains.

Claims (2)

1. A method of transmitting information over a radio channel when driving a train with locomotives distributed along its length during double-track movement, which consists in the fact that when the train meets the train with locomotives distributed along its length, the frequencies of the remote control and tele-signaling signals are relative to the frequencies of the remote control and tele-signaling train, characterized in that the remote control signals and signaling of the train are transmitted during the absence of transmission of remote control signals and remote signaling echnogo the train. 2. A device for transmitting information over a radio channel when driving a train with locomotives distributed along its length during double-track movement, containing an adaptive radio modem and a locomotive control system located on the locomotives, characterized in that an antenna-feeder device connected to the input / output with an input / output device is additionally installed on each locomotive adaptive radio modem, a time distributor including a series-connected signal receiver, a spectrum and signal level analyzer, a threshold device and a form Signal generator, the first input / output of which is connected to another output / input of the adaptive radio modem, a buffer device connected between the second input / output of the signal conditioner and the output / input of the locomotive control system, series-connected odd and even frequency determiner, and a frequency synthesizer, output connected to the second input of the signal receiver, a comparison unit, the input connected to the second output of the spectrum analyzer and signal level, and the output to another input of the frequency synthesizer, at m determinant input frequencies of even and odd lines is connected to an engine output control system, the signal receiver input coupled to the output of antenna-feeder device.

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