CN101242194A - Digital demodulation device applied to CTCS standard point responder - Google Patents
Digital demodulation device applied to CTCS standard point responder Download PDFInfo
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- CN101242194A CN101242194A CNA2007100356622A CN200710035662A CN101242194A CN 101242194 A CN101242194 A CN 101242194A CN A2007100356622 A CNA2007100356622 A CN A2007100356622A CN 200710035662 A CN200710035662 A CN 200710035662A CN 101242194 A CN101242194 A CN 101242194A
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Abstract
The invention discloses a digital modulating device for CTCS standard responder, comprising a main controller unit, an input signal filtering unit, a signal amplifying unit, an AD converting unit, a power supply unit and an external communication unit for filtering an input signal filtering unit with interruption noise which is orderly connected to the AD converting unit and the main controller unit via the amplifying unit. The main controller unit is to process digital filter operation to obtained digital signal to obtain real-time original signal and to process antenna malfunction and signal intensity judgment. The external communication unit is to process external electric isolation for the output signal of the main controller unit and to convert signal end signal to the difference signal so as to improve anti-interruption ability of the signal. The power supply unit is to provide various required grade voltages for other units, at the same time to judge stability of the system to generate restoring signal. The invention has simple structure, low cost, low power consumption and so on. The modulation operation is of excellent accuracy, real-time performance and safety.
Description
Technical field
The present invention is mainly concerned with the control field of railway locomotive safety means, refers in particular to a kind of digital demodulating apparatus of the CTCS of being applied to standard dot-mode transponder.
Background technology
In recent years, along with improving constantly of train running speed, the further increasing of operation density, railway transportation is more and more higher to the requirement of train control system (ATC system), and existing equipment is because with low content of technology, and its controlled function does not but obtain best performance.In the rail transportation system abroad, all be to use special-purpose ground installation to provide the absolute location information of train to onboard system basically, this equipment is exactly dot-mode transponder.ERTMS/ETCS (the European railway transport administration system/European Train Control System) system in Europe is the train control system of at present most advanced in the world, system.Railroad has been formulated the standard (CTCS standard) of Chinese train control system with reference to the requirement of ETRMS/ETCS, and in this standard, dot-mode transponder recognition device (being demodulating equipment) is a critical component in the system.Because it will make the automaticity of train control system be further enhanced, the development level of China ATC system will be strided forward to higher level.Current digitlization and software implementation are the research and development focus directions of control system.With the development of traditional analogue system along with digital circuit technique, no matter be industry or civilian control system, all develop in direction towards " digitlization ".Because compare with analog signal, digital signal is easier to detect.Compare with analog circuit, anti-distortion of digital circuit and antijamming capability are strong.Digital demodulating apparatus is as one of core component in the responder system, and the accuracy of demodulation operation, real-time and fail safe have very big influence to the performance of responder system.
Summary of the invention
The problem to be solved in the present invention just is: at the technical problem of prior art existence, the invention provides a kind of simple in structurely, with low cost, low in energy consumption, its demodulation operation has the digital demodulating apparatus that is applied to CTCS standard dot-mode transponder of preferable accuracy, real-time and fail safe.
For solving the problems of the technologies described above, the solution that the present invention proposes is: a kind of digital demodulating apparatus that is applied to CTCS standard dot-mode transponder, it is characterized in that: it comprises Main Control Unit, the input signal filter unit, signal amplification unit, the AD converting unit, power subsystem and external communication unit, being used for the input signal filter unit of the outer interference noise of filtering band links to each other with Main Control Unit with the AD converting unit through signal amplification unit successively, the digital signal that Main Control Unit is used for obtaining is carried out the digital filtering operation and is obtained real-time original signal, and carry out antenna failure and signal strength signal intensity and judge, externally communication unit is used for the output signal of Main Control Unit is carried out external electrical isolation, and transfer single-ended signal to differential signal to improve the antijamming capability of signal, power subsystem provides various required voltage gradations for other unit, judges that simultaneously the stability of system produces reset signal.
The input of described Main Control Unit links to each other with an antenna failure detecting unit, and whether the antenna failure detecting unit is used for detecting antenna work normal, thereby can reduce the amount of delaying work of system.
The output of described Main Control Unit links to each other with a display unit, and display unit is used for the processing result information of Main Control Unit is shown, and realizes man-machine interaction.
Described signal amplification unit is by forming based on the multistage low pass amplifying circuit of chip AD8354 and by the logical amplifying circuit of the full band of the level Four of forming with chip AD812.
Described AD converting unit adopts the high-speed AD sampling A AD9283 of 8bit.
Described Main Control Unit adopts chip EP2C8Q208C8N.
Compared with prior art, advantage of the present invention just is:
1, the present invention's method of being applied to handle by digital filtering in the digital demodulating apparatus of CTCS standard dot-mode transponder fsk modulated signal that will comprise message information is demodulated into real-time, Exact Number signal and output; have the antenna failure measuring ability simultaneously, show in real time that by display unit this device work state information, alarm indication can reach device security monitoring and protection simultaneously.
2, the present invention's digital demodulating apparatus of being applied to CTCS standard dot-mode transponder is mainly used in the safe operation control field of locomotive, so simple in structure, with low cost and design that high reliability is high that the inevitable requirement system adopts in design, thereby the easy accessibility of assurance device, dependable performance must be asked.
3, the present invention's digital demodulating apparatus of being applied to CTCS standard dot-mode transponder is compared with the analogue means with congenerous, this digital device has stronger electromagnetism antijamming capability after adopting the digitized processing mode, has advantages such as precision is higher, processing speed is faster simultaneously aspect data acquisition and processing (DAP).
4, the present invention's digital demodulating apparatus of being applied to CTCS standard dot-mode transponder is considered the abominable of the environment that this device is worked fully on the type selecting of device, and all chips are all selected technical grade, can work normally in-45 ℃ to 70 ℃ scopes.
5, the present invention is applied to the digital demodulating apparatus of CTCS standard dot-mode transponder in the mode that adopts analog sampling and digital processing to isolate aspect the electromagnetic compatibility when designing, thereby avoid extraneous interference signal to disturb this device, can satisfy the iron mark about the Electro Magnetic Compatibility standard by modes such as ground.
Description of drawings
Fig. 1 is a frame structure schematic diagram of the present invention;
Fig. 2 is the circuit theory schematic diagram of antenna failure detecting unit among the present invention;
Fig. 3 is the circuit theory schematic diagram of input signal filter unit among the present invention;
Fig. 4 is the circuit theory schematic diagram of signal amplification unit among the present invention;
Fig. 5 A is the schematic diagram one of part port in the Main Control Unit of the present invention;
Fig. 5 B is the schematic diagram two of part port in the Main Control Unit of the present invention;
Fig. 5 C is the schematic diagram three of part port in the Main Control Unit of the present invention;
Fig. 5 D is the schematic diagram four of part port in the Main Control Unit of the present invention, power pack and part peripheral circuit;
Fig. 6 is the circuit theory schematic diagram of power subsystem among the present invention;
Fig. 7 is the circuit theory schematic diagram of AD converting unit among the present invention;
Fig. 8 is the circuit theory schematic diagram of external communication unit among the present invention.
Marginal data
1, Main Control Unit 2, input signal filter unit
3, signal amplification unit 4, AD converting unit
5, display unit 6, power subsystem
7, external communication unit 8, antenna failure detecting unit
Embodiment
Below with reference to the drawings and specific embodiments the present invention is described in further details.
As shown in Figure 1, the present invention is applied to the digital demodulating apparatus of CTCS standard dot-mode transponder, it comprises Main Control Unit 1, input signal filter unit 2, signal amplification unit 3, AD converting unit 4, power subsystem 6 and external communication unit 7, being used for the input signal filter unit 2 of the outer interference noise of filtering band links to each other with Main Control Unit 1 with AD converting unit 4 through signal amplification unit 3 successively, the digital signal that Main Control Unit 1 is used for obtaining is carried out the digital filtering operation and is obtained real-time original signal, and carry out antenna failure and signal strength signal intensity and judge, externally communication unit 7 is used for the output signal of Main Control Unit 1 is carried out external electrical isolation, and transfer single-ended signal to differential signal to improve the antijamming capability of signal, power subsystem 6 provides various required voltage gradations for other unit, judges that simultaneously the stability of system produces reset signal.In preferred embodiment, the input of Main Control Unit 1 links to each other with an antenna failure detecting unit 8, and the fault-signal that antenna failure detecting unit 8 is sent by antenna is judged the antenna operating state, thereby avoids the misoperation of whole system.The output of Main Control Unit 1 links to each other with a display unit 5, and display unit 5 is used for the processing result information of Main Control Unit 1 is shown, and realizes man-machine interaction.
Referring to Fig. 2～Figure 8 shows that specific embodiment of the present invention.In the present embodiment, the present invention is by the 2FSK signal of the input signal centre frequency 4.234MHz ± 200KHz of antenna collection, the power carrier wave of the 27.095MHz that is used for activating ground transponder has simultaneously superposeed, at this moment the interference signal that comprises other frequency in the message signals simultaneously needs input signal is effectively handled the true form information that just can obtain in the ground transponder being comprised.
As shown in Figure 2, antenna failure detecting unit 8 among the present invention, its input signal are from the resulting antenna failure signal of antenna power amplification device.Adopt low-pass filter circuit on its structure, this low-pass filter circuit is made up of inductance, electric capacity and photoelectric coupling circuit.Input signal obtains direct current antenna failure signal (5V is normal, the 0V fault) through the low-pass filter circuit of L17 and C65 formation.Deliver to after the R68 current limliting among the photoelectric isolated chip U21.Whether output signal was advanced to draw on the R67 and was sent into Main Control Unit, normal for its operating state of judging antenna, avoided error message is passed to the subordinate unit.
As shown in Figure 3, input signal filter unit of the present invention 2 adopts passive bandwidth-limited circuit, and its input signal is the 2FSK signal of centre frequency 4.234MHz ± 200KHz of being received from the 4M antenna, also has other frequency noise simultaneously and imports from the P3 joint.The passive bandwidth-limited circuit of the Pyatyi that two high-pass filtering circuits being made up of resistance, electric capacity and inductance on its structure and three low-pass filter circuits are formed, act as the outer interference signal of the various bands of filtering, its passband is 3MHz to 5MHz, inhibition to the 27.095MHz frequency range reaches-70dB, message signals has the above signal to noise ratio of 20dB after guaranteeing filtering, sends into amplifying unit 3 then.
As shown in Figure 4, signal amplification unit 3 among the present invention.Its input signal is the 2FSK signal by the resulting comparatively clean 4.234MHz ± 200KHz in filter unit 2 back.By forming based on the multistage low pass amplifying circuit of chip U2 (AD8354) and by the logical amplifying circuit of the full band of the level Four of forming with chip U3, U4 (AD812), its gain amplifier is 20db on this cellular construction.With amplifier U3, U4 is the example explanation, because all be to adopt single 5V power supply power supply, so amplify after input signal must be raised again.Resistance R 13, R14 dividing potential drop make signal voltage raise 2V, and the signal input amplifier backward end after raising constitutes amplifying circuit.U13,14 adopts AD812 amplifier chip in this device, and according to the data of closed loop gain in the chip data handbook, the relative 4M frequency range of the gain when 27.095MHz has the decay of 6dB, the influence of the interference signal that this further reduces.Export to the AD sample circuit through the transformer of magnitude after amplifying simultaneously.By the 0.98db that decays to the 4M signal of this transformer of isolating transformer P4, P5 (TC4-1W), less to the influence of useful signal.Simulation part and numerical portion can be isolated by transformer simultaneously.Every grade gain amplifier is 10db in the logical amplifying circuit of full band.This unit is output as the 2FSK signal after the complete amplification of waveform, and the A/D convertor circuit 4 of giving subordinate carries out the A/D sampling.
Shown in Fig. 5 A-5D, Main Control Unit 1 among the present invention, and its input signal derives from 8 bit digital A/D signals of AD converting unit output and the antenna failure signal of exporting from the antenna failure detecting unit respectively.Its structural main control chip is the fpga chip EP2C8Q208C8N that ALTERA company is released.Independently simulate the frequency multiplication module because this device has 2, adopting incoming frequency in the system is the high speed operation frequency that 27M obtains 810M after by frequency multiplication.EP2C8Q208C8 also has a plurality of built-in multiplier modules simultaneously, is convenient to the needs that FIR filter and fft filters are done Digital Signal Processing.The integrated memory technology of M4K in EP2C8Q208C8, thus can realize the degree of depth storage of data.Thereby the EP2C8Q208C8 disposal ability that helps improving whole system realizes at a high speed in sum, the work of real-time Digital Signal Processing.Can also realize clock signal, demonstration control, the external functions of transmitting such as control that judgement, generation and the data of antenna failure signal processing, signal strength signal intensity align by FPGA simultaneously.The output signal of this unit is the required control signal LEDD0～LEDD7 of display unit 5, gives the LED1～LED4 of display unit as shown in the figure.Export external communication unit 7 required DATA+IN, CLK+IN signal simultaneously.
As shown in Figure 6, power subsystem 6 of the present invention is responsible for the voltage that device provides stable a plurality of demand levels.Its input signal is resulting 5V direct current input from the motherboard.U10 is that common mode choke coil can reach the interference that reduces from power supply and can reduce self interference to external power source simultaneously.U11 (PC3-5-5) changes the power isolation module of 5V for 5V, thereby can obtain the relatively independent 5V power supply for the numerical portion power supply.For relatively independent 5V power supply being provided for the simulation part parallel circuit, adopted voltage isolation chip U12 (DCP010505), thereby reached numeral, the independently-powered effect that is independent of each other of simulation.Because numerical portion has comparatively complicated Power Level demand, U14 (REF2912), U15 (UC382T), U16 (TPS75933) are respectively the required required 3.3V voltage of 1.2V voltage, numerical portion of reference voltage, FPGA that AD transforms provides 1.25V.Power monitoring manager when U17 (TPS3307), U18 (TPS3123), U17 are responsible for monitoring the electric power thus supplied of the 5V and the 3.3V of numerical portion, and the 5th pin of U17 produces low level and is defeated by FPGA when spread of voltage descends to some extent; Same U18 mainly is responsible for the supervision effect of numerical portion 1.2V, can also monitor the stability of the clock signal of FPGA by guarding the gate to the dog management simultaneously.This unit is output as numerical portion Main Control Unit 1, display unit 5, the external reference voltage REV of required D5V, 1.2V, 3.3V, VCCPLLA, VCCPLLB and the AD conversion of communication unit 7, AD converting unit 4.Export in addition simultaneously Main Control Unit judge D5V, 3.3V power supply whether stabilization signal RESETA (the RESETA signal will be dragged down when D5V and 3.3V are unstable, just often export high level), judge the 1.2V power supply whether stabilization signal RESETB (the RESETB signal will be dragged down when 1.2V is unstable, just often export high level) and judge the whether stable WDI signal of Main Control Unit clock (when Main Control Unit not to).
As shown in Figure 7, the A/D convertor circuit 4 among the present invention, the input signal of this unit 2FSK signal after for the amplification of the output of the anti-big unit 3 of higher level.That adopt on this cellular construction is the high-speed AD sampling A AD9283 of 8bit, and the sample frequency the highest by the chip data can reach 100MSPS.Because the highest effective frequency is 4.5M generally just can reflect one-period more than 5 points of sampling in a wave period a wave form varies, so the sample frequency of choosing is 45MSPS, directly 8 output AD0-AD8 is passed to main control chip FPGA level Main Control Unit 1 after the AD sampling and carry out data processing for it.
As shown in Figure 8, external communication unit 7 among the present invention, DATA+IN, the CLK+IN signal of its input signal for coming out from Main Control Unit.The U19 that adopts on its structure, U20 bit digital magnetic isolating device ADUM1100 make master controller and outside communication to the effect of isolating thereby reached.Export the two independent differential signal from DATA+ and CLK+ signal that Main Control Unit is come by being defeated by 485 communication bus managers after isolating, thereby have good stable and anti-interference.The former coded signal of output ground transponder device is given the decoding device of subordinate and is handled.
Claims (6)
1. digital demodulating apparatus that is applied to CTCS standard dot-mode transponder, it is characterized in that: it comprises Main Control Unit (1), input signal filter unit (2), signal amplification unit (3), AD converting unit (4), power subsystem (6) and external communication unit (7), being used for the input signal filter unit (2) of the outer interference noise of filtering band passes through signal amplification unit (3) successively and links to each other with Main Control Unit (1) with AD converting unit (4), the digital signal that Main Control Unit (1) is used for obtaining is carried out the digital filtering operation and is obtained real-time original signal, and carry out antenna failure and signal strength signal intensity and judge, externally communication unit (7) is used for the output signal of Main Control Unit (1) is carried out external electrical isolation, and transfer single-ended signal to differential signal to improve the antijamming capability of signal, power subsystem (6) provides various required voltage gradations for other unit, judges that simultaneously the stability of system produces reset signal.
2. the digital demodulating apparatus that is applied to CTCS standard dot-mode transponder according to claim 1, it is characterized in that: the input of described Main Control Unit (1) links to each other with an antenna failure detecting unit (8), and antenna failure detecting unit (8) is used for judging whether operate as normal of antenna.
3. the digital demodulating apparatus that is applied to CTCS standard dot-mode transponder according to claim 1 and 2, it is characterized in that: the output of described Main Control Unit (1) links to each other with a display unit (5), display unit (5) is used for the processing result information of Main Control Unit (1) is shown, and realizes man-machine interaction.
4. the digital demodulating apparatus that is applied to CTCS standard dot-mode transponder according to claim 3 is characterized in that: described signal amplification unit (3) is by forming based on the multistage low pass amplifying circuit of chip AD8354 and by the logical amplifying circuit of the full band of the level Four of forming with chip AD812.
5. the digital demodulating apparatus that is applied to CTCS standard dot-mode transponder according to claim 4 is characterized in that: described AD converting unit (4) adopts the high-speed AD sampling A AD9283 of 8bit.
6. the digital demodulating apparatus that is applied to CTCS standard dot-mode transponder according to claim 5 is characterized in that: described Main Control Unit (1) adopts chip EP2C8Q208C8N.
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| CN2007100356622A CN101242194B (en) | 2007-08-30 | 2007-08-30 | Digital demodulation device applied to CTCS standard point responder |
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Cited By (9)
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| CN102222371A (en) * | 2011-04-20 | 2011-10-19 | 北京交大思诺科技有限公司 | Business technology management (BTM) dedicated recorder and data recording and storing method |
| CN102427372A (en) * | 2011-04-19 | 2012-04-25 | 北京锦鸿希电信息技术股份有限公司 | China train control system (CTCS) point type transponder demodulating device and implementation method thereof |
| CN101540656B (en) * | 2009-04-22 | 2012-05-09 | 深圳市远望谷信息技术股份有限公司 | Decoding device and decoding method used for intermittent balise of CTCS |
| CN101651654B (en) * | 2009-09-01 | 2012-07-18 | 深圳市远望谷信息技术股份有限公司 | Energy extraction and data clock recovery equipment of active responder |
| CN101442335B (en) * | 2008-12-31 | 2012-07-25 | 中国铁道科学研究院通信信号研究所 | Responder |
| CN102801914A (en) * | 2012-08-21 | 2012-11-28 | 深圳市影歌科技有限公司 | Digital camera electronic focus tracking device and zoom method |
| CN106585667A (en) * | 2016-12-16 | 2017-04-26 | 杭州钱江称重技术有限公司 | System and method for detecting faults of vehicle-mounted beacon antenna |
| CN108011363A (en) * | 2017-11-10 | 2018-05-08 | 北京全路通信信号研究设计院集团有限公司 | A kind of overvoltage crowbar and transponder A interface protective circuits |
| CN108776469A (en) * | 2018-06-26 | 2018-11-09 | 北京长城华冠汽车技术开发有限公司 | Vehicle mounted communication module monitoring system and monitoring method |
Family Cites Families (2)
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| FR2746756B1 (en) * | 1996-04-01 | 1998-06-12 | Matra Transport International | FAULT-TOLERANT MOBILE PASSAGE DETECTION DEVICE |
| CN1233104C (en) * | 2000-07-04 | 2005-12-21 | 克里蒂帕斯株式会社 | Passive transponder identification system and credit-card type transponder |
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| CN101442335B (en) * | 2008-12-31 | 2012-07-25 | 中国铁道科学研究院通信信号研究所 | Responder |
| CN101540656B (en) * | 2009-04-22 | 2012-05-09 | 深圳市远望谷信息技术股份有限公司 | Decoding device and decoding method used for intermittent balise of CTCS |
| CN101651654B (en) * | 2009-09-01 | 2012-07-18 | 深圳市远望谷信息技术股份有限公司 | Energy extraction and data clock recovery equipment of active responder |
| CN102427372A (en) * | 2011-04-19 | 2012-04-25 | 北京锦鸿希电信息技术股份有限公司 | China train control system (CTCS) point type transponder demodulating device and implementation method thereof |
| CN102222371A (en) * | 2011-04-20 | 2011-10-19 | 北京交大思诺科技有限公司 | Business technology management (BTM) dedicated recorder and data recording and storing method |
| CN102222371B (en) * | 2011-04-20 | 2013-04-17 | 北京交大思诺科技有限公司 | Business technology management (BTM) dedicated recorder and data recording and storing method |
| CN102801914A (en) * | 2012-08-21 | 2012-11-28 | 深圳市影歌科技有限公司 | Digital camera electronic focus tracking device and zoom method |
| CN106585667A (en) * | 2016-12-16 | 2017-04-26 | 杭州钱江称重技术有限公司 | System and method for detecting faults of vehicle-mounted beacon antenna |
| CN108011363A (en) * | 2017-11-10 | 2018-05-08 | 北京全路通信信号研究设计院集团有限公司 | A kind of overvoltage crowbar and transponder A interface protective circuits |
| CN108776469A (en) * | 2018-06-26 | 2018-11-09 | 北京长城华冠汽车技术开发有限公司 | Vehicle mounted communication module monitoring system and monitoring method |
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Address after: 412001 Hunan Province, Zhuzhou Shifeng District Tian Xin North Gate Patentee after: ZHUZHOU CRRC TIMES ELECTRIC Co.,Ltd. Address before: 412001 Hunan Province, Zhuzhou Shifeng District Tian Xin North Gate Patentee before: ZHUZHOU CSR TIMES ELECTRIC Co.,Ltd. |
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Effective date of registration: 20170622 Address after: 21, building 7, building 189, No. 410100, Renmin East Road, Changsha economic and Technological Development Zone, Hunan, Changsha Patentee after: HUNAN CRRC TIMES SIGNAL & COMMUNICATION Co.,Ltd. Address before: 412001 Hunan Province, Zhuzhou Shifeng District Tian Xin North Gate Patentee before: ZHUZHOU CRRC TIMES ELECTRIC Co.,Ltd. |