The Xi'an railroad sub-bureau electricity service branch, the Xi'an Jiaotong University information mechanical and electrical research institute, in under the Zhengzhou railroad bureau science committee's instruction, in the foundation which many years scientific research accumulates, developed "the railroad to move the satellite communication platform", established long-distance between the dispatching station and the travel locomotive, real-time, the macrozonality space communication platform. (Train) and between the ground dispatching station provides the bidirectional data communication for the high speed movement locomotive, does not need to pass through the complex ground communications net, the locomotive may transport and the movement information real-time, the long range takeoffs transmits the dispatching station, the dispatching station may dispatch the information directly to transmit the locomotive. This system may for system and so on railroad DMIS, TMIS provide real-time, the long-distance data communication service and the transportation data acquisition function, thus the realization railway transportation dispatches timeliness and accuracy.

This system structure like chart 1 shows. In the locomotive installment migration communications satellite terminal, through the Earth static synchronization communications satellite, realizes between the locomotive and the ground dispatching station bidirectional communication, dynamic transmits the locomotive movement parameter information long-distance range the dispatching station (or other ground organizations), causes the dispatching station (or other ground organizations) keeps abreast of the locomotive movement situation immediately. This system has solved the locomotive and the ground real-time bidirectional communication difficult problem, the system application prospect is extremely broad, but widely applies to the railroad dispatch management system management system, the transportation management system, the thing flows the management system management system, the special purpose vehicle dispatch and so on many domains. At present in this communication platform foundation, already has developed a train automatic newspaper system.

1 system characteristic
"The railroad moves the satellite communication platform" in the high speed travel locomotive (train) and between the ground below, as well as between the travel locomotive open style builds, the macrozonality space bidirectional data communication platform, the system has the characteristic:

1. data communications mobility, 双向�? timeliness

The high speed travel locomotive may carry on the satellite communication in the movement process, realizes in the locomotive movement transportation data acquisition and the exchange of information. The data communication is bidirectional, the ground dispatching station may to the locomotive transmission data, the locomotive also be allowed to the ground transmission data. Communication timeliness is higher, may carry on the data communication immediately.

2. communications ways combination nimble, the function formidable, the application domain is broad

According to needs to be possible to select the many kinds of migrations satellite communication method: Between ground dispatching station and movement locomotive communication; Between movement locomotive and movement locomotive communication; The ground dispatching station and ground other transport is away from the department communication. The ground dispatching station may demand (position, coach number number on own initiative to the locomotive which the locomotive current transportation information for example is at and so on), the locomotive also may to the ground dispatching station transmission current transportation information, like to station transmission newspaper information, to the dividing line mouth transmission train transportation weight, the idea be on own initiative long and so on the information.

3. real-time gathering and transmission locomotive trains movement and transportation data

The vehicle carries the equipment setup in the locomotive TAX box, may real-time obtain the locomotive movement recording instrument the data, carries on processing to the locomotive movement and the transportation data, if automatically produces to the station newspaper points according to, and real-time transmits the ground dispatching station. The vehicle carries the system not only to be allowed to gather the locomotive movement recording instrument the data (), moreover the system has provided more than 200 equipment connections, may hang meets other locomotive equipment.

Information and so on 4. coach numbers numbers automatic real-time track and real-time transmission

The system vehicle carries the equipment automatically from the locomotive movement recording instrument gathering coach number number and other transportation information. And may the information which gathers through the satellite communication real-time transmit the ground dispatching station, simultaneously, transmits the along the way station through the wireless transmission module. The realization train coach number number automatic real-time track, and may the real time display or the history returns on the electronic map puts the train running status.

5. systems effective are quick, invest few

The system only needs to rent a static synchronization communications satellite the frequency band then. The general migration satellite communication (for example international marine satellite Inmarsat, iridium star communication, global magnitude) use the massive close-orbit satellite much, the investment greatly effective is slow. The iridium star is composed by 66 close-orbit satellites, the entire ball game star is composed by 48 satellites. But this system use existing home static synchronization communications satellite, according to needs to rent the synchronization communications satellite the communication frequency channel then to clear the movement, according to will need to expand the satellite frequency band then to satisfy the next promotion and the expansion.

6. systems do not need the ground huge communications net

The system does not need the ground complex communications net support, the locomotive and the ground communication directly through the satellite, greatly reduced the system complexity and the maintenance difficulty, sped up the system construction speed. This data communication has provided the broad potential for the next railroad other applications.

7. communications entire day marquis, cross region

The satellite communication coverage is big, may cover the Earth all areas, may all-weather, the cross region, transport the distance the communication, does not need to construct 基站 and the relay station.

8. open style designs, took a communication platform supplies other system uses

The system was a ground and the locomotive long-distance communication platform, the system has provided the open connection. The vehicle carries the equipment to be allowed to connect 255 other equipment through 485 main lines, and carries on the communication. The ground system provides with the railroad other systems data connections (for example DMIS, TMIS and so on).

9. operations costs are lower

The system operation cost mainly is the communication expense, because the communication system uses CDMA (a code minute site) to code, may complete the multichannel communication in the limited communication band width. The system uses the Ku wave band the satellite communication, the controllable locomotive quantity in theoretically does not receive limits, when the vehicles increase, only needed to increase the satellite transponder the band width to be allowed.

10. 先进�? the stability are high

This system uses the international most advanced migration satellite communication technology, these technologies originally use in military, uses in to direct and mobile target and so on dispatch military airplane, tank, ships. Between the locomotive and the dispatching station carries on the communication through the satellite, does not need the huge ground communications net, the communication stability is high. The motion satellite terminal, uses the military standard design and the manufacture, guaranteed 22 years do not maintain.

11. securities, the secrecy, the anti-jamming are good

This system communications satellite uses the domestic satellite, moreover according to needs to be allowed automatically, dynamic to adjust the satellite the frequency channel, guarantees the entire communication system by the domestic control, thus guarantees the system communication the security. The communication uses the CDMA code, the secrecy and the anti-jamming is good.

2 system functions
1. provides the long-distance range bidirectional data communication between the locomotive and the ground

Uses the motion satellite technology, the realization high speed movement locomotive and the ground (dispatching station) the between bidirectional communication, does not need the ground complex communications net the support, directly through static geostationary satellite, all-weather, between long-distance range realization locomotive and ground dispatching station bidirectional data communication.

Carries the equipment through the vehicle the wireless communication module or unifies the DMIS system the wireless coach number number equipment. Also may the data near distance which gathers Che Zai transmit along the way the station.

2. real-time gathering and transmission locomotive movements and transportation data

The vehicle carries the equipment setup in the locomotive TAX box, may real-time obtain the locomotive movement recording instrument the data, carries on processing to the locomotive performance data, and real-time transmits the ground dispatching station. For example the judgement arrives with through the station time, the realization automatic newspaper spot. Below from transports counts may gain the data: The coach number number, the date time, the speed, the cab signal, the locomotive operating mode, the semaphore serial number, the semaphore type, a kilometer sign, the gross weight, the idea are long, the number of vehicles, this/makes up, the guest/goods, the sector number (hands over road number), the vehicle station number, the department serial number, the assistant driver number, machine the vehicle number, the locomotive vehicle type, the pipe pressure and so on. And provides the connection and the locomotive other equipment carries on the connection and the communication.

3. trains automatic newspapers and automatic plan actual accomplishments performance diagram

The establishment in the railroad bidirectional satellite datum communication platform foundation, provides the train an automatic newspaper function. The vehicle carries the station serial number, the semaphore serial number, a kilometer sign and the speed which the equipment obtains transports will record, the judgement arrives the station the arrival time, the departure time, the pass time passage period, through the migration satellite communication, does not need to pass through the station multistage transmission, will arrive the station time information direct transmission dispatching station, the dispatching station system may automatically draw up the actual accomplishments performance diagram. In the computer may demonstrate the actual accomplishments performance diagram, can carry on the enlargement, reduce, the migration, and may print.

4. coach numbers numbers automatic tracking and localization track

The system provides two kind of localizations technologies: Railroad kilometer sign, geographic coordinate (after and latitude). A kilometer sign transports from the locomotive records obtains, may accurately determine the locomotive according to a railroad kilometer sign in the railroad concrete position. Uses the whole world to locate the GPS technology to be allowed to obtain the locomotive geographic coordinate, and may demonstrate in the electronic map, the image is direct-viewing. Is different in view of the application situation, two localizations methods may unify the use, on the electronic map may the real-time track locomotive operating position and the movement parameter.

5. railroads electrons map demonstration automatic tracking train as well as automatic plan railroad electron map

Uses the geography information technology, the image visual display railroad line and along the route the equipment (for example information and so on station, semaphore), as well as is moving the locomotive condition, the positional information, the electronic map can carry on the enlargement, reduce and so on processing. Has to the historical data puts the function.

The system specially provides a set of railroads electrons map the automatic plan tool. Locomotive information and so on station position, kilometer sign, after, latitude, semaphore serial number which could each second be at in the movement process real-time transmits the dispatching station, dispatching station software automatically draws up the railroad the electronic map. In other words, only needs the locomotive to move a time, may automatically draw up the along the route railroad electron map, the railroad electron map may the automatic sign note leave information and so on station, semaphore position, kilometer sign, coordinates.

6. dispatches and transportation data statistics function

According to the automatic newspaper points according to, may automatically have the statistical data which dispatches and transports needs, like is being late statistical, the driving diary production and so on other functions.

7. vehicles carry the system and the ground system open the hair style connection design

Installs carries the equipment in the locomotive vehicle fully to consider openness, guaranteed takes a communication platform use. The vehicle carries the system to be allowed to connect more than 200 expansions equipment through the industry standard 485 connections, the new expansion equipment all may use the satellite the communication platform to carry on the communication.

The ground processing system provides the open style data mouth connection and the communication connection, guaranteed and the railroad other systems (for example DMIS, TMIS and so on) carry on the data exchange. For example coach number information which transmits the locomotive and so on, transmits DMIS, TMIS.

8. long-distance on-line automatic promotion functions

Installs carries the equipment in the locomotive vehicle in the connection development foundation, processing software, communication software and the system parameter which among them inlays all may carry on the long-distance automatic promotion and the revision. The ground dispatching station will be allowed through the satellite communication, new software to transmit the vehicle to carry in the equipment, will realize the on-line promotion. For example, when increases the vehicle carries the system the new function, no matter locomotive whether is moving, the ground dispatching station transmits new software through the satellite the locomotive, realizes the vehicle to carry the equipment the promotion.

Between 9. locomotives and the dispatching station may transmit the dispatch order and the news

The dispatching station, the mechanical section may send out the dispatch order, the notice and the news to the movement locomotive, and the demonstration gives the locomotive train attendant, the locomotive also may to the dispatching station, the mechanical section transmission movement information and the news.

10. dispatching stations obtain the information on own initiative to the locomotive

The dispatching station may according to the need, obtain the locomotive on own initiative the movement information

(1) obtains the locomotive the current positional information, including kilometer sign, latitude and longitude, in station and so on.

(2) currently obtains the locomotive to transport the register according to, was allowed to obtain the locomotive at that time 40 bytes movements information.

(3) obtains the locomotive the control condition data, like whether is at the tracking mode and so on.

(4) controls the locomotive control condition, may establish Che Zai the condition, like start or cancellation tracking mode and so on.

(5) obtains or revises the locomotive the junction way according to the information.

11. locomotives bases establish parameter automatically to dispatching station transmission information.

The locomotive may act according to the dispatching station hypothesis the condition, selects following method automatically to the dispatching station transmission information, the dispatching station may revise the locomotive as necessary the active status.

(1) tracking mode: May establish the track time-gap (for example 20 seconds), then the locomotive continuously is at through the satellite to the dispatching station transmission locomotive kilometer information and so on sign, latitude and longitude, station serial number.

(2) automatic newspaper condition: In an automatic newspaper condition, the locomotive every time passes through a station, will arrive will stand, leaves, through the time and the speed transmits the dispatching station immediately.

(3) transports the data through a semaphore automatic transmission which records: Under this condition, the locomotive every time through a semaphore, immediately transports this time counts according to (40 bytes), the latitude and longitude transmits the dispatching station.

Outside (4) stands stops reports to the police: If the locomotive stops outside the station, the locomotive stops immediately to the dispatching station transmission station outside reports to the police the information.

(5) automatic transmission locomotive continual positional information: Under this condition, every 4 seconds kind of records locomotive kilometer sign, the latitude and longitude, 1 minute transmits a time of information to the dispatching station. This function uses in automatically to draw up the railroad the electronic map, and carries on the multianalysis to the locomotive movement path.

3 systems compositions
"The railroad moves the satellite communication platform and the transportation dispatch management system management system" carries the system and the ground system by the vehicle is composed. The core technology is uses the static geostationary satellite the migration satellite communication technology, the realization tells the movement locomotive and the ground long-distance range bidirectional communication.

3.1 vehicles carry the system
The vehicle carries the system by the migration satellite communication terminal unit, the vehicle carries the control unit, the demonstration unit, the expansion unit, the wireless communication module and so on is composed.

1. migrations satellite communication terminal unit

The migration satellite communication terminal unit installs in the locomotive vehicle roof, like chart 8 shows. The migration satellite communication terminal unit by the locomotive 110 direct-current power supplies power supply, carries the control unit through the RS232 communication mouth and the vehicle to carry on the communication.

The migration satellite communication terminal unit by the satellite antenna servo system, the communication code decoding system and so on is composed. The satellite antenna servo system automatically aims at the antenna the static synchronization communications satellite, the communication code decoding system realizes CDMA (a code minute site) the communication, realizes in the limited satellite frequency band 频率复用.

2. vehicles carry the control unit

The vehicle carries the control unit to insert in the locomotive TAX box (like chart 9 shows), completes reads from TAX and the conveyor takes the locomotive movement information, carries on processing after the information, transmits the information through the migration satellite communication terminal unit the ground. The vehicle carries the control unit to be allowed to exchange the information through the IC card, may promote the procedure through the satellite communication and the parameter. The vehicle carries the control unit to install in the locomotive TAX box (locomotive security information synthesis detector set) center, automatically (transports from the locomotive movement recording instrument records) center real-time reads takes the locomotive transportation and the performance data (for example coach number, machine vehicle number, a kilometer sign, gross weight, idea is long, number of vehicles, vehicle station number and so on).

3. demonstrations/inputs unit

The demonstration/input unit installs in the locomotive I end and II end, uses in to demonstrate the ground the news notice, the locomotive train attendant industry may the infed information concurrently deliver the ground.

4. expansions units

The system uses the hair style structure, is a communication platform, may carry on the communication with the locomotive other equipment, and according to needs to transmit the additional informations through the satellite the ground.

5. wireless communications modules

The system may (or wireless row accent) connects with the short distance wireless communication module, realizes the near distance locomotive and the ground communication. For example, the system reserves the installment wireless communication module, may the locomotive movement information, directly nearby the process station, transmit to the station which passes.

3.2 ground systems
Motion satellite ground system like chart 10 shows, is composed by the satellite master station and the railroad dispatching station.

1. satellites master stations

The satellite master station carries on the communication through the synchronization communications satellite and the locomotive mobile termination. The national railroad profession only constructs a satellite master station already to be allowed.

2. railroads dispatching stations

The railroad each place dispatching station and the satellite master station carry on the communication, the realization and the locomotive communication. The dispatching station and the satellite master station may select the many kinds of communications method, like VSAT satellite communication, data communication and so on. Installs the computer system in the railroad dispatching station, the realization dispatches the management which and transports.