CN1012491B - Dispatch and command system for planar dispatching trains - Google Patents
Dispatch and command system for planar dispatching trainsInfo
- Publication number
- CN1012491B CN1012491B CN 88103503 CN88103503A CN1012491B CN 1012491 B CN1012491 B CN 1012491B CN 88103503 CN88103503 CN 88103503 CN 88103503 A CN88103503 A CN 88103503A CN 1012491 B CN1012491 B CN 1012491B
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Abstract
The present invention relates to a secondary dispatch and command system for planar dispatching trains, which is composed of a dispatcher handset, a coupler handset, a vehicle-carried station for a driver and a dispatch station. The system adopts digital pulse code signals and high-frequency carrier keying frequency and amplitude modulating signals for dispatching signals of the system. The audio frequency in the subcarrier frequency of the primary modulation of the digital pulse code signal is the same as that in an analog signals, so the system solves the problem that the existing system can not make coupler stop signals prior, and the system assures driving safety and personnel safety. The present invention adopts the collector keying amplitude modulation of a driving stage, so machine weight is lightened and electric power consumption is reduced.
Description
The invention belongs to the dispatch and command system for planar dispatching trains of railway transportation shunting service.
The railway transportation schedule job of shunting is originally with red green flag and signal lamp personnel selection union network commander's.The accuracy of this command echelon and reliability are all very poor, and safety factor is low, often owing to the shunting command error causes driving and human casualty accident.
The Anshan iron and steel plant department of Transport was once developed a kind of radio shunting signal machine, can carry out one-way traffic and send shunting signal with radio, improved the reliability of shunting, but owing to can not converse mutually, group did not become dispatching and command system.
China Academy of Railways Sciences were developed a kind of plane marshalling system in 1986, were published on 1986 the 10th phases of " railway communication signal " magazine, were called " command echelon of 400m flat shunting ".This system is made up of the SH403KC portable radio of Shanghai radio two factories production and the transmitter of SC2410 vehicle carried wireless phone and three kinds of sound equipments controls of 2YH-1 type band.These three kinds of audible signals are respectively:
Speed-slackening signal, the calling signal of cranking signal and calling line watch house.Pass on the order of shunting with these three kinds of signals when shunting.
This shunting command system utilizes small-sized FM radio station as transmission channel, selects for use the channel of difference to carry out coded combination in its voice grade, to represent the shunting service signal that will transmit.The shunting signal that emitter sent in the system all is the CW of constant amplitude.Principle and characteristic according to frequency modulated receiver, when receiver is imported the carrier signal of two same frequencies at the same time, discriminator can only be exported wherein that stronger signal of carrier signal, another more weak signal then gets clogged fully, therefore can't solve in the business of shunting vital, guarantee binding person's stop signal priority issues of safe driving, because one is used the group of shunting of radio car transferring system to be made up of driver, shunter, binding person three parts.In order to effectively utilize high frequency channel, the people of this three aspect can only a shared wireless channel.During operation, if the shunter is initiating moving or train signal, binding person then must send out stop signal owing to run into extraordinary circumstances, at this moment the driver should the company of obedience member's signal, and in fact driver's receiver to have imported two high frequent carrier frequency simultaneously identical, the shunting signal that modulation signal is different, because usefulness is frequency modulated receiver, discriminator can only be exported one stronger in these two signals, and it is irrelevant with modulation signal, therefore can't guarantee that binding person's stop signal is preferential, also just be difficult to guarantee the safety of shunting service.
The purpose of dispatch and command system for planar dispatching trains of the present invention will solve exactly guarantees binding person's stop signal priority issues, thereby the safety and precise of guaranteeing railway train arrangement operation is reliable.
Another object of the present invention is to save the current consumption of command echelon, alleviates the weight and volume of emitter, falls end operating charges.
Two purposes of the present invention are to use inferior infrasound selective call, and during the selective call conversation, inferior infrasound and speech transmit simultaneously, thereby can make full use of the outer frequency domain of voice grade, or few busy channel time, reduce various mutual interference among signals.
According to the present invention, dispatch and command system for planar dispatching trains is made up of shunter's hand-held set, connection person's hand-held set, driver's Vehicle mounted station and four parts of dispatching desk, having constituted shunter, binding person, driver is the employing digital pulse coding of shunt a group and a dispatching desk, with the shunt communication network of scheduling of the two-stage of rf carrier keyed amplitude modulation mode of frequency regulation transmission signals.In the group of shunting, the shunter can send red, yellow, the green three color scheme car signal of representative to the driver with shunter's hand-held set, commander's shunting service.
According to the present invention, the shunter can converse with inferior infrasound selective calling device and dispatcher, and the available binding person's hand-held set of binding person sends the unlocking signal of binding person's stop signal and this signal to the driver.
According to the present invention, in dispatching and command system, adopted the signal of two kinds of different systems, a kind of is the digital pulse coding signal, represents the shunting signal of red, yellow, the green three kinds of colors that will transmit as baseband signal with three kinds of difform time sequential pulses; Another kind is an analog signal, the stop signal that will transmit as binding person with a continuous sound signal.In shunter's hand-held set,, also this baseband signal is modulated on the subcarrier frequency in advance simultaneously the rf carrier keyed amplitude modulation with baseband signal, and then frequency modulation, be remodulation, thereby the shunting signal that shunter's hand-held set sends is a kind of rf carrier keyed amplitude modulation frequency-modulated wave.In binding person's hand-held set, by the sound signal direct frequency modulation of sending out stop signal, so the stop signal that the binding hand-held set sends is a kind of CW.In the signal of these two kinds of standards, the subcarrier frequency of digital pulse coding signal primary modulation is identical with the audio frequency in the analog signal, thereby has solved binding person's stop signal priority issues.Its principle is, when shunter and binding person send signal simultaneously, if binding person's signal is better than shunter's signal then receiver must show binding person's stop signal; When if shunter's signal is better than binding person's stop signal, two kinds of situations are arranged: 1, shunter's keyed amplitude modulation ripple is for " 1 ", promptly is high frequency frequency modulated carrier when output is arranged, and the output of receiver discriminator is shunting signal; When shunter's keyed amplitude modulation signal was " 0 ", when promptly being high frequency frequency modulated carrier no-output, what the receiver discriminator was exported was binding person's stop signal; Because the subcarrier frequency of shunter's signal is identical with binding person's stop signal frequency, what discriminator was exported is that a frequency is identical, the continuous sound signal of constant amplitude, this signal is almost completely identical with the sound signal of the stop signal of representing binding person, it is some point of discontinuity on phase place, so after the receiver circuit processing, still can demonstrate binding person's stop signal, thereby guarantee that binding person's stop signal is preferential.
According to the present invention, keyed amplitude modulation can be in frequency double, driver stage or the modulation of power amplifier level, and modulation system can be base stage modulation, emitter modulation, collector modulation, wherein with the collector modulation of driver stage for well.Its advantage is:
(1) high-frequency emission in former radio station is partly changed minimum, do not influence original hf channel characteristic;
(2) just can reach the keying modulation that whole rf carrier is exported with less small power switch pipe;
(3) the new frequency component that rf carrier produced behind the frequency modulation is minimum, can drop on fully in the hf channel of permission.
According to the present invention, owing to adopted rf carrier keying FMAM, be 1: 1 and be that according to the average duty ratio of " 1 " and " 0 " of baseband signal driver stage and power amplifier level are not worked, so saved current consumption at 0 o'clock in baseband signal.
Various characteristics of the present invention and purpose can be more clearly described by accompanying drawing.Accompanying drawing has provided an example of the present invention, but the utility model is not limited.
Fig. 1 is shunter's hand-held set block diagram of the present invention.
Fig. 2 is binding person's hand-held set block diagram.
Fig. 3 is the block diagram of driver's Vehicle mounted station.
Fig. 4 is the dispatching desk block diagram, and the content of each frame that dots out all is identical.
Fig. 5 is the schematic diagram of shunter's hand-held set coder, testing circuit, signal aspect and indication and memory circuit.
Fig. 6 is driver's Vehicle mounted station receiver demoder schematic diagram.
Below in conjunction with accompanying drawing the present invention is elaborated.
As shown in Figure 1, shunter's hand-held set installs a block signal encoding board and relevant detection circuit additional by common FM radio station, promptly by common FM radio station part, selective call part, baseband signal composite part, fault detection part and signal conditioning and memory section, and hand switch is formed.The conventional portable FM radio station is by speech channel radioamplifier 1, the local oscillator of high frequency circuit and frequency double 2, rf carrier penultimate amplifier 3(also is the carrier amplitude modulator), rf carrier power amplifier 4, high frequency receiving circuit 5 are formed.According to shunter's hand-held set of the present invention, except above-mentioned FM radio station, also comprise: inferior infrasound oscillator 6, subcarrier oscillator 8, these two kinds of oscillators can be by transistor, the RC oscillator that integrated circuit and resistance-capacitance are formed is formed, also can be formed, also can be obtained this two oscillator signals with a king oscillator frequency division by transistor, integrated circuit and mechanical filter; Subcarrier modulator 7 can be formed with switching valve or digital integrated circuit; Coder 9 can be formed with cmos digital integrated circuit or other digital integrated circuit; Hand switch 10; Detect impulse deviser 11 and can be equipped with suitable RC element composition with transistor numeral integrated circuit; The kind that transmits memory circuit and supply voltage monitoring circuit 12 are made up of digital integrated circuit and stabilivolt; Selective call part during by selective call inferior infrasound and speech form by the inferior infrasound oscillator 6 of Channel Transmission simultaneously; The baseband signal composite part form by subcarrier modulator 7, subcarrier oscillator 8, coder 9 and fault detection part by detecting impulse deviser 11 and transmit kind memory circuit and electric power monitor 12 are formed, signal processing comprises that baseband signal amplifier 13, power supply electronic change-over swith 14, the emissive power telltale 15 be made up of low energy and pressure drop aerotron are formed, emissive power telltale 15 can be serially connected in the power supply of final power amplifier by light emitting diode, and also the mode of available high-frequency coupling is formed.
The structure of binding person's hand-held set is made up of common fm radio station part, baseband signal composite part, signal conditioning and memory section as shown in Figure 2, and the structure of these several parts is identical with shunter's hand-held set structure.
Driver's Vehicle mounted station is made up of parts such as HF transmitter 16, receptor, received signal synchronous demodulator, shunter's signal sync decoder, binding person's signal processor, sound signal generator 37, fault detectors 38.As shown in Figure 3, the Vehicle mounted station receptor is made up of high frequency receiving cable 17, frequency discriminator 18, speech channel voltage amplifier 19, low-frequency power amplifier 20; The high-frequency emission passage 16 of projector is used to transmit; The received signal synchronous demodulator is used for the baseband signal that is modulated on the subcarrier is recovered ortho states, it comprises by switch triode, the squelch circuit of the demoder incoming signal that diode and capacitance resistance ware are formed and slicer 21, the frequency selecting amplifier of being formed by crystal triode exclusive disjunction amplifier and LC resonant tank or RC frequency selection network 22, the phase demodulator 23 that phase place frequency discriminator of forming with diode and coupling circuit or analog multiplier are formed, with the LC resonant tank of high Q value or the narrow band filter 24 of mechanical filter composition, carrier amplitude decision device 25, the subcarrier phase shift amplifier of being formed by aerotron or LC resonant tank 26, baseband signal dresser 27; Shunter's decoding signals can translate three kinds of baseband signals, remove to drive display circuit, this partial circuit can be made up of the digital integrated circuit and the resistance capacitor device of CMOS or other type, comprising frame synchronization separation circuit 28, bit synchronization signal producer 29, correlation integral device 30, decoder register 31, shunter's telltale 32; Binding person's signal processor comprises binding person's stop signal integrator 33, amplitude judgement and signal memory circuit 34, binding person's signal indicator 35 of forming by high power transistor and indicator lamp or light-emitting diode, binding person's unlocking signal decoder 36 of being formed by CMOS or other type digital circuit, sound signal generator 37 is a kind of voltage controlled oscillator (VCO)s, can be made up of the integrated circuit and the resistance capacitance of transistor, CMOS integrated circuit or other type.
Dispatching desk can be made up of a plurality of module.As an example, 4 modules have been shown among Fig. 4, the inner structure of each module all is identical: a high frequency receiving cable 42, an isolated amplifier 43, a master cock 44, inferior infrasound frequency selecting amplifier 45 can be formed 46, one high-frequency emission passages 41 of a selective call indicator lamp and a low-frequency power amplifier 47 by transistor amplifier or integrated circuit operational amplifier or integrated circuit operational amplifier and RC filter network.
The following describes the principle of work of the dispatching and command system of originally shunting.
The shunter during with his hand-held set give a signal, hand switch 10 starts transfer switch 14, signal kinds memory circuit 12, coder 9 is with subcarrier sound signal synthetic required baseband signal in coder of input, and this baseband signal is delivered to subcarrier modulator 7, baseband signal amplifier 13 respectively.Delivered to local oscillation circuit 2 frequency modulation by the subcarrier signal after the baseband signal amplitude modulation, removed to control the mode of operation of driver stage 3 by the baseband signal that the baseband signal amplifier amplifies, thereby obtain keying FMAM ripple at final stage power amplifier.
When the selective call mode of operation, hand switch 10 starts inferior infrasonic wave generator 6, and voice signal and inferior infrasound sound signal are sent into local oscillator level 2 frequency modulation together.
Binding person's hand-held set is when sending out binding person's stop signal, and hand switch 10 directly starts transfer switch 14, baseband signal amplifier 13, subcarrier modulator 7.With regard to direct frequency modulation, the baseband signal amplifier is not controlled the mode of operation of driver stage 3 to subcarrier yet without primary modulation, so obtain the CW of the permanent width of cloth at final stage power amplifier.When sending out the unlocking signal of stop signal, the modulator approach of coder 9 output signals is identical with the modulator approach of shunter's hand-held set.
Driver's Vehicle mounted station is when receiving signal, the signal of discriminator 18 outputs is at first after squelch circuit and limiter circuit 21 processing, send into frequency selecting amplifier 22, signal by frequency selecting amplifier output, be divided into two-way, one the tunnel delivers to phase demodulator 23, narrow band filter 24 is delivered on another road, if can arrive the threshold level of amplitude decision circuit 25 by the signal of narrow band filter 24 output, then this signal can be sent into phase demodulator to the incoming signal demodulation by the subcarrier signal that becomes the constant amplitude homophase after phase shift amplifier 26 processing and amplifying.If the signal of input is shunter's a digital baseband signal, frame synchronization separation circuit 28 just has signal output, can make demoder enter mode of operation, by the cooresponding shunting signal of decoder 31 output, and by telltale 32 demonstrations.If incoming signal is binding person's a stop signal, integrator 33 will be exported a direct current level, is that available binding person's signal display circuit 35 shows this signal through memory circuit 34, and shunter's signal display circuit 32 has also been blocked in the output of memory circuit 34 simultaneously.Only after binding person sent out unlocking signal again, binding person's unlocking signal decoder 36 had had output, removed the memory signal of memory circuit line, and binding person's stop signal just can be disengaged, and can show shunter's signal once more after this.
In the presence of the existing shunter's digital baseband signal of incoming signal, when binding person's stop signal is arranged again, if at the wireless input end of driver's receiver, binding person's high-frequency carrier signal is better than the dispatcher's, then the receiver discriminator is just imported a single audio signal, becoming a DC level after the demoder demodulation, this signal demonstrates this stop signal by connection person's signal display circuit 35 after integrator 33 is handled.If shunter's signal is better than binding person's signal, two kinds of situations are arranged then; When (1) shunter's keyed amplitude modulation ripple is " 1 ", when carrier wave output is promptly arranged, what receiver discriminator 18 was exported is shunter's subcarrier frequency signal, when shunter's keyed amplitude modulation frequency-modulated wave is " 0 ", when promptly not having rf carrier output, the receiver antenna input end is remaining binding person's CF signal only, so discriminator output is binding person's sound signal of stopping, because the subcarrier frequency of shunter's signal is identical with the audio frequency of binding person's stop signal, so discriminator output is a constant amplitude, continuous single audio signal, the feature of this signal is almost in full accord with the feature that links stop signal, so can show binding person's signal by demodulator circuit and binding person's signal processing circuit, so no matter what situation can both guarantee that binding person's stop signal is preferential.
Fig. 5 and Fig. 6 show embodiments of the invention.
In shunter's hand-held set shown in Figure 5, inferior infrasound oscillator is made up of with relevant resistance, electric capacity CMOS IC 1; Subcarrier modulator 7 is made up of cmos digital IC 3 and hand switch; Subcarrier oscillator 8 is made up of with tuning fork and relevant resistance, electric capacity cmos digital IC 2, especially, can be made up of with tuning fork and relevant resistance, electric capacity the single Schmidt trigger IC2 in the CMOS integrated circuit, this oscillator also can constitute the low frequency voltage controlled oscillator (VCO) of high stability in the phaselocked loop; Baseband signal coder 9 is made up of 5 cmos digital ICs 4, IC5, IC6, IC7, IC10 and relevant resistance, electric capacity; Detecting impulse deviser is made up of two cmos digital ICs 12, IC13 and relevant resistance, electric capacity; Voltage detecting circuit is made up of with triode BG8 and relevant resistance, electric capacity cmos digital IC 14 with the kind memory bistable circuit 12 that transmits; Electronic power supply change-over swith 14 is made up of 5 triode BG1, BG2, BG5, BG6, BG7 and relevant resistance capacitance.
Fig. 6 is the embodiment schematic diagram of driver's Vehicle mounted station.The squelch circuit of demoder incoming signal is made up of with two diode D3, D4 and relevant resistance capacitance an aerotron BG9 with slicer 21, this squelch circuit utilizes the principle of frequency spectrum shift, noise in the passband is moved away from the outer frequency range of voice band, signal to noise ratio can be improved 3dB; LC frequency selecting amplifier 22 is made up of with the primary winding of capacitor C 1, voltage transformer B1 and relevant resistance capacitance two triode BG10, BG11; Narrow band filter 24 is made up of tuning fork filter YL and BG12 and related resistors electric capacity, and the received signal synchronous demodulator is the synchronous demodulation circuit that is extracted subcarrier by tuning fork as narrow band filter; Carrier amplitude decision device 25 is by two aerotron BG13, and BG14 and relevant resistance capacitance are formed; Subcarrier phase shift amplifier 26 is made up of primary winding and the relevant resistance of an aerotron BG15, capacitor C 2, voltage transformer B2; Phase demodulator 23 is made up of with two voltage transformer B1, B2 and relevant resistance, electric capacity two diode D2, D7; Baseband signal dresser 27 is made up of an aerotron BG16 and relevant resistance, electric capacity; Frame homogenous frequency signal disconnector 28 is by three aerotrons, and relevant resistance, electric capacity are formed; Binding person's stop signal integrator is by a diode D12, and resistance R, capacitor C 3 are formed.
Claims (6)
1, a kind of by portable fm radio station, vehicle carried wireless radio station, with the flat shunting dispatch control network system that transmitter, coder, decoder, transmitter, the receptor of three kinds of sound equipments controls are formed, it is characterized in that
(1) this network system is made up of shunter's hand-held set, connection person's hand-held set, driver's Vehicle mounted station and dispatching desk,
(2) adopt a kind of digital pulse coding, with shunting signal and a kind of analog signal of rf carrier keyed amplitude modulation mode of frequency regulation transmission, the stop signal that will transmit as connection person with a continuous sound signal, in the signal of these two kinds of standards, the subcarrier frequency of digital pulse coding signal primary modulation is identical with the audio frequency in the analog signal
(3) shunter's hand-held set is made up of common fm radio station part, selective call part, baseband signal composite part, fault detection part, signal conditioning and memory section and hand switch,
(4) connection person's hand-held set is made up of common fm radio station part, baseband signal composite part, signal conditioning and memory section,
(5) driver's Vehicle mounted station is made up of HF transmitter 16, receptor, received signal synchronous demodulator, shunter's signal synchronous demodulator, connection person's signal processor, sound signal generator 37, fault detector 38,
(6) dispatching desk is made up of high-frequency emission passage 41, high frequency receiving cable 42, isolated amplifier 43, master cock 44, inferior infrasound frequency selecting amplifier 45, selective call indicator lamp 46, low power amplifier 47.
2, the said command echelon of a kind of claim 1, inferior infrasound and speech are made up of the inferior infrasound oscillator 6 of Channel Transmission simultaneously when it is characterized in that said selective call part by selective call, said baseband signal composite part is by subcarrier modulator 7, subcarrier oscillator 8, coder 9 is formed, said fault detection part is by detecting impulse deviser 11, the type records that transmits circuit and supply voltage monitoring circuit 12 are formed, and said signal processing is by baseband signal amplifier 13, electronic power supply change-over swith 14, emissive power telltale 15 is formed.
3, said command echelon in a kind of claim 1, it is characterized in that said driver's Vehicle mounted station receptor is by high frequency receiving cable 17, discriminator 18, speech channel voltage amplifier 19, low-frequency power amplifier 20 is formed, said received signal synchronous demodulator is by the squelch circuit and the slicer 21 of demoder incoming signal, frequency selecting amplifier 22, phase demodulator 23, narrow band filter 24, carrier amplitude decision device 25, subcarrier phase shift amplifier 26, baseband signal dresser 27 is formed, said shunter's signal sync decoder is by frame synchronization separation circuit 28, bit synchronization signal producer 29, correlation integral device 30, decoder register 31, shunter's signal indicator 32 is formed, and said binding person's signal processor is by binding person's stop signal integrator 33, amplitude judgement and signal memory circuit 34, binding person's signal indicator 35, binding person's signal decoder 36 is formed.
4, said command echelon in a kind of claim 2 is characterized in that said subcarrier oscillator 8 is by the single Schmidt trigger IC in the CMOS integrated circuit
2Form with tuning fork and relevant resistance, electric capacity.
5, said command echelon in a kind of claim 3 is characterized in that said squelch circuit and slicer are by aerotron BG
9With two diode D
3, D
4Relevant resistance, electric capacity are formed.
6, said command echelon in a kind of claim 1 is characterized in that said received signal synchronous demodulator is the synchronous demodulation circuit that is extracted subcarrier by tuning fork as narrow band filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103503 CN1012491B (en) | 1988-06-08 | 1988-06-08 | Dispatch and command system for planar dispatching trains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88103503 CN1012491B (en) | 1988-06-08 | 1988-06-08 | Dispatch and command system for planar dispatching trains |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038432A CN1038432A (en) | 1990-01-03 |
| CN1012491B true CN1012491B (en) | 1991-05-01 |
Family
ID=4832628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88103503 Expired CN1012491B (en) | 1988-06-08 | 1988-06-08 | Dispatch and command system for planar dispatching trains |
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| Country | Link |
|---|---|
| CN (1) | CN1012491B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409576C (en) * | 2001-10-17 | 2008-08-06 | 通用电气公司 | Signal error detection in railroad communication system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117128B (en) * | 2007-07-24 | 2010-10-06 | 北京全路通信信号研究设计院 | Station adjusting machine automatic drive system |
| CN101635890B (en) * | 2009-07-28 | 2012-10-10 | 北京佳讯飞鸿电气股份有限公司 | Short message control system of keyed dispatching desk and control method thereof |
| IT1397584B1 (en) * | 2009-12-18 | 2013-01-16 | Eltek Spa | MONITORING DEVICE FOR A WHEEL OF A VEHICLE AND ITS COMMUNICATION METHOD. |
| CN101917371A (en) * | 2010-07-16 | 2010-12-15 | 天津七一二通信广播有限公司 | Double-path fast frequency-shift keying (FFSK) same and different frequency synchronous decoding circuit for locomotive radio station |
| CN101954917B (en) * | 2010-09-09 | 2012-05-09 | 天津七一二通信广播有限公司 | Method for realizing shunting operation list transmission through level-adjustment communication equipment |
| CN103746952B (en) * | 2013-12-26 | 2016-12-07 | 北京无线电计量测试研究所 | A kind of amplitude-modulated wave baseband signal production method and device |
-
1988
- 1988-06-08 CN CN 88103503 patent/CN1012491B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409576C (en) * | 2001-10-17 | 2008-08-06 | 通用电气公司 | Signal error detection in railroad communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1038432A (en) | 1990-01-03 |
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