CN102427372A - China train control system (CTCS) point type transponder demodulating device and implementation method thereof - Google Patents
China train control system (CTCS) point type transponder demodulating device and implementation method thereof Download PDFInfo
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- CN102427372A CN102427372A CN2011100980951A CN201110098095A CN102427372A CN 102427372 A CN102427372 A CN 102427372A CN 2011100980951 A CN2011100980951 A CN 2011100980951A CN 201110098095 A CN201110098095 A CN 201110098095A CN 102427372 A CN102427372 A CN 102427372A
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Abstract
The invention discloses a China train control system (CTCS) point type transponder demodulating device. The device consists of a 4M antenna, a matching circuit, a power amplifier circuit, a band pass filter circuit, an analog/digital (AD) sampling module, a signal detection circuit, a field programmable gate array (FPGA), a rectification circuit and a through point detection circuit, wherein the FPGA consists of the AD sampling module, a differential module, a compatible integrated circuit (CIC) extraction filter module, a compensation filter, a finite impulse response (FIR) filter module and a signal judgment module. The CTCS point type transponder demodulating device can receive and demodulate effective data in a transponder in a wireless mode, can read and verify data written by programming equipment, and can demodulate data of transponders of other manufacturers. The technology can be applied to a transponder transmission module of vehicle-mounted receiving equipment. The CTCS point type transponder demodulating device can demodulate information quickly when a train drives at a high speed and passes through the transponder and provides safe and reliable operating data to a train operation control system. The device has the advantages of simple structure, low cost and high precision.
Description
Technical field
The present invention relates to the dot-mode transponder among the Chinese train control system CTCS, relate in particular to a kind of CTCS dot-mode transponder demodulating equipment and its implementation.
Background technology
This year is along with train running speed improves constantly, railway transportation to train control system require increasingly high.Abroad in the rail transportation system, all be to use special-purpose ground installation to onboard system the absolute location information of train to be provided basically, this kind equipment is exactly dot-mode transponder.Corresponding, the transponder demodulation module is installed ON TRAINS, this module is mainly used in sends wireless energy signal activation dot-mode transponder, receives the fsk signal of dot-mode transponder transmission simultaneously and recovers the message information in the dot-mode transponder.For guaranteeing the high reliability of communication; The CTCS of prior art has adopted a cover complex rule that the data message is encoded; Recognition device need carry out just obtaining reliable data message behind the corresponding decode operation after receiving message, the decoding device complex structure, and the decode operation fault-tolerant ability is low; Particularly present demodulation all is to adopt analog signal, and its antijamming capability is relatively poor.Decoding device is as one of core component of CTCS dot-mode transponder, and the accuracy of decode operation and real-time have very big influence to the performance of whole C TCS.
Summary of the invention
The objective of the invention is to the deficiency to prior art, provide a kind of mode of utilizing digital demodulation to realize the CTCS dot-mode transponder demodulating equipment of high accuracy demodulation, it is strong to have an antijamming capability, characteristics simple in structure, with low cost when work.
CTCS dot-mode transponder demodulating equipment is made up of 4M antenna, match circuit, amplifying circuit, bandwidth-limited circuit, AD sampling module, signal demodulator circuit, FPGA, rectification circuit, a mistake point testing circuit; Wherein, FPGA is made up of input data latching module, difference block, CIC filtering extraction module, compensating filter, FIR filter, signal decision module, output data latch module, FSK enable module, time delay module and simultaneous extraction module; The 4M antenna is connected with match circuit; Be connected to amplifying circuit, amplifying circuit is connected with bandwidth-limited circuit, through dividing two-way behind three-stage amplifier and the two-stage bandwidth-limited circuit; One the tunnel is connected with the AD sampling module; Be connected to FPGA and carry out signal processing, another road is connected with the signal demodulator circuit, is connected to rectification circuit and crosses the some testing circuit; FPGA is inner; Input data latching module, difference block, CIC filtering extraction module, compensating filter, FIR filter, signal decision module, output data latch module connect successively; The FSK enable module is connected to input data latching module; Time delay module is connected respectively to input data latching module and difference block, and the simultaneous extraction module is connected respectively to signal decision module and output data latch module.
CTCS dot-mode transponder demodulating equipment demodulation method is: transponder is after receiving the wireless energy signal of 27.095MHz; Space radiation 4M signal towards periphery; Coupling receives through the 4M antenna in the receiving demodulation unit of transponder programming and testing equipment; To the received signal through power amplifier with bandwidth-limited circuit amplifies and bandpass filtering; Be quantized into after the digital signal and the information that receives carried out the FSK demodulation through AD according to the clock frequency of the 564KHz of Europe superscript, giving CPU decoding unit with data after the demodulation, wherein:
The concrete steps of demodulation are: at first 4M antenna and match circuit receive the signal from transponder, send into demodulator circuit through three grades of amplifications and two-stage filtering, demodulate the data of 564KHz;
Secondly, with the clock of the 33.87M reference clock as the FPGA demodulation part, signal extracts synchronised clock after sending into FPGA in demodulated data, as the synchronization of data clock;
Another road signal of while is sent into signal and is existed in the testing circuit, carries out detection and generation enable signal that signal has or not, and described enable signal receives the enabling signal of data simultaneously as the FSK enable signal among the FPGA as CPU.
The mode of differential ference spiral is adopted in the inner demodulation of described FPGA, and when adopting the mode of differential ference spiral, the code element delay duration is that a symbol width and signal are long-pending from what multiply each other, and filter adopts three grades of filter constructions.
Three grades of filter constructions of the employing of said filter are specially: first order digital filter adopts cic filter; Carry out 15 grades of filtering extractions; Second level filter adopts compensating filter to carry out 2 times of filtering extractions, and third level filter adopts the FIR filter to carry out 2 times of filtering extractions, after signal is carried out 60 times of extractions altogether; The digital signal that obtains uses judging module to adjudicate, and obtains the signal after the demodulation.
CTCS dot-mode transponder demodulating equipment of the present invention has versatility, not only can be used on the transponder programming and testing equipment, also can be used on the transponder transport module of onboard reception device.
CTCS dot-mode transponder demodulating equipment of the present invention can carry out the wireless receiving demodulation by the interior valid data of transponder; Data to programming device writes are read checking; The data of other standard producer transponders of demodulation; This technology also can be used for the transponder transport module of onboard reception device, when train is run at high speed through transponder, information is carried out fast demodulation, for train operation control system provides safe and reliable service data information; Simultaneously this device have simple in structure, with low cost, the advantage that accuracy is high.
Description of drawings
The structured flowchart of Fig. 1 CTCS dot-mode transponder demodulating equipment.
FPGA internal structure block diagram in Fig. 2 CTCS dot-mode transponder demodulating equipment.
4M antenna in Fig. 3 CTCS dot-mode transponder demodulating equipment receives match circuit.
Bandwidth-limited circuit in Fig. 4 CTCS dot-mode transponder demodulating equipment.
Amplifying circuit in Fig. 5 CTCS dot-mode transponder demodulating equipment.
The circuit of AD sampling module in Fig. 6 CTCS dot-mode transponder demodulating equipment.
Embodiment
As depicted in figs. 1 and 2; CTCS dot-mode transponder demodulating equipment is made up of 4M antenna, match circuit, amplifying circuit, bandwidth-limited circuit, AD sampling module, signal demodulator circuit, FPGA, rectification circuit, a mistake point testing circuit; Wherein, FPGA is made up of input data latching module, difference block, CIC filtering extraction module, compensating filter, FIR filter, signal decision module, output data latch module, FSK enable module, time delay module and simultaneous extraction module; The 4M antenna is connected with match circuit; Be connected to amplifying circuit, amplifying circuit is connected with bandwidth-limited circuit, through dividing two-way behind three-stage amplifier and the two-stage bandwidth-limited circuit; One the tunnel is connected with the AD sampling module; Be connected to FPGA and carry out signal processing, another road is connected with the signal demodulator circuit, is connected to rectification circuit and crosses the some testing circuit; FPGA is inner; Input data latching module, difference block, CIC filtering extraction module, compensating filter, FIR filter, signal decision module, output data latch module connect successively; The FSK enable module is connected to input data latching module; Time delay module is connected respectively to input data latching module and difference block, and the simultaneous extraction module is connected respectively to signal decision module and output data latch module.
CTCS dot-mode transponder demodulating equipment demodulation method is: transponder is after receiving the wireless energy signal of 27.095MHz; Space radiation 4M signal towards periphery; Coupling receives through the 4M antenna in the receiving demodulation unit of transponder programming and testing equipment; To the received signal through power amplifier with bandwidth-limited circuit amplifies and bandpass filtering; Be quantized into after the digital signal and the information that receives carried out the FSK demodulation through AD according to the clock frequency of the 564KHz of Europe superscript, giving CPU decoding unit with data after the demodulation, wherein:
The concrete steps of demodulation are: at first 4M antenna and match circuit receive the signal from transponder, send into demodulator circuit through three grades of amplifications and two-stage filtering, demodulate the data of 564KHz;
Secondly, with the clock of the 33.87M reference clock as the FPGA demodulation part, signal extracts synchronised clock after sending into FPGA in demodulated data, as the synchronization of data clock;
Another road signal of while is sent into signal and is existed in the testing circuit, carries out detection and generation enable signal that signal has or not, and described enable signal receives the enabling signal of data simultaneously as the FSK enable signal among the FPGA as CPU.
Fig. 3 is the schematic diagram of 4M antenna reception match circuit, 1R303,1C305; 1C306,1C307 have formed the antenna receiving circuit, and can make resonance frequency is centre frequency 4.234MHz; To receive fsk modulated signal preferably, the signal amplitude that can reach 4.516MHz and two kinds of frequencies of 3.951MHz makes impedance reach good coupling about equally; As shown in Figure 3, antiresonant circuit 1L301,1C308; 1C309,1L302 and series resonance 1L303,1C310 is inhibited to the signal of 27.095M.
Fig. 4 is the bandwidth-limited circuit in the CTCS dot-mode transponder demodulating equipment, and significant feature is with the clutter filtering of sneaking into circuit, and the useful signal of 4.564MHZ and 3.951MHZ is passed through.
Fig. 5 is the amplifying circuit in the CTCS dot-mode transponder demodulating equipment, can change amplification multiple through changing 1R316.
Fig. 6 is the circuit of AD sampling module in the CTCS dot-mode transponder demodulating equipment, and the signal after the amplification converts differential signal to by 1U1301, gives 1U1302 and carries out the AD sampling, is quantized into digital signal to analog signal, gives FPGA and decodes.
The mode of differential ference spiral is adopted in the inner demodulation of described FPGA, and when adopting the mode of differential ference spiral, the code element delay duration is that a symbol width and signal are long-pending from what multiply each other.
Described filter adopts three grades of filter constructions; Be specially: first order digital filter adopts cic filter, carries out 15 grades of filtering extractions, and second level filter adopts compensating filter to carry out 2 times of filtering extractions; Third level filter adopts the FIR filter to carry out 2 times of filtering extractions; After signal was carried out 60 times of extractions altogether, the digital signal that obtains used judging module to adjudicate, and obtained the signal after the demodulation.
CTCS dot-mode transponder demodulating equipment of the present invention has versatility, not only can be used on the transponder programming and testing equipment, also can be used on the transponder transport module of onboard reception device.
CTCS dot-mode transponder demodulating equipment of the present invention can carry out the wireless receiving demodulation by the interior valid data of transponder; Data to programming device writes are read checking; The data of other standard producer transponders of demodulation; This technology also can be used for the transponder transport module of onboard reception device, when train is run at high speed through transponder, information is carried out fast demodulation, for train operation control system provides safe and reliable service data information; Simultaneously this device have simple in structure, with low cost, the advantage that accuracy is high.
Claims (5)
1.CTCS the dot-mode transponder demodulating equipment is made up of 4M antenna, match circuit, amplifying circuit, bandwidth-limited circuit, AD sampling module, signal demodulator circuit, FPGA, rectification circuit, a mistake point testing circuit; Wherein, FPGA is made up of input data latching module, difference block, CIC filtering extraction module, compensating filter, FIR filter, signal decision module, output data latch module, FSK enable module, time delay module and simultaneous extraction module; The 4M antenna is connected with match circuit; Be connected to amplifying circuit, amplifying circuit is connected with bandwidth-limited circuit, through dividing two-way behind three-stage amplifier and the two-stage bandwidth-limited circuit; One the tunnel is connected with the AD sampling module; Be connected to FPGA and carry out signal processing, another road is connected with the signal demodulator circuit, is connected to rectification circuit and crosses the some testing circuit; FPGA is inner; Input data latching module, difference block, CIC filtering extraction module, compensating filter, FIR filter, signal decision module, output data latch module connect successively; The FSK enable module is connected to input data latching module; Time delay module is connected respectively to input data latching module and difference block, and the simultaneous extraction module is connected respectively to signal decision module and output data latch module.
2. utilize the described CTCS dot-mode transponder of claim 1 demodulating equipment to realize the method for demodulation; It is characterized in that; Transponder after receiving the wireless energy signal of 27.095MHz, space radiation 4M signal towards periphery, the receiving demodulation unit of transponder programming and testing equipment is through 4M antenna coupling reception; To the received signal through power amplifier with bandwidth-limited circuit amplifies and bandpass filtering; Be quantized into after the digital signal and the information that receives carried out the FSK demodulation through AD according to the clock frequency of the 564KHz of Europe superscript, giving CPU decoding unit with data after the demodulation, wherein:
The concrete steps of demodulation are: at first 4M antenna and match circuit receive the signal from transponder, send into demodulator circuit through three grades of amplifications and two-stage filtering, demodulate the data of 564KHz;
Secondly, with the clock of the 33.87M reference clock as the FPGA demodulation part, signal extracts synchronised clock after sending into FPGA in demodulated data, as the synchronization of data clock;
Simultaneously another road signal is sent into signal and is existed in the testing circuit, carries out the detection that signal has or not and produces enable signal SPI_EN simultaneously, as the FSK enable signal among the FPGA, receives the enabling signal of data simultaneously as CPU.
3. CTCS dot-mode transponder demodulating equipment demodulation method as claimed in claim 2; It is characterized in that; The mode of differential ference spiral is adopted in the inner demodulation of described FPGA; When adopting the mode of differential ference spiral, the code element delay duration is that a symbol width and signal are long-pending from what multiply each other, and filter adopts three grades of filter constructions.
4. CTCS dot-mode transponder demodulating equipment demodulation method as claimed in claim 2; It is characterized in that said filter adopts three grades of filter constructions, is specially: first order digital filter adopts cic filter; Carry out 15 grades of filtering extractions; Second level filter adopts compensating filter to carry out 2 times of filtering extractions, and third level filter adopts the FIR filter to carry out 2 times of filtering extractions, after signal is carried out 60 times of extractions altogether; The digital signal that obtains uses judging module to adjudicate, and obtains the signal after the demodulation.
5. CTCS dot-mode transponder demodulating equipment as claimed in claim 1; It is characterized in that; Described CTCS dot-mode transponder demodulating equipment has versatility, not only can be used on the transponder programming and testing equipment, also can be used on the transponder transport module of onboard reception device.
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| CN2011100980951A CN102427372A (en) | 2011-04-19 | 2011-04-19 | China train control system (CTCS) point type transponder demodulating device and implementation method thereof |
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| CN2011100980951A CN102427372A (en) | 2011-04-19 | 2011-04-19 | China train control system (CTCS) point type transponder demodulating device and implementation method thereof |
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Cited By (6)
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| CN106774275A (en) * | 2017-01-16 | 2017-05-31 | 湖南中车时代通信信号有限公司 | Visualize the test system and method for the control function of train operation monitoring device |
| CN107534456A (en) * | 2015-08-31 | 2018-01-02 | 旭化成微电子株式会社 | Demodulating equipment |
| CN108189869A (en) * | 2017-12-22 | 2018-06-22 | 交控科技股份有限公司 | The condominium region setting of CTCS-2 and CBTC and the method switched in condominium region |
| CN110138466A (en) * | 2019-05-31 | 2019-08-16 | 沈阳铁路信号有限责任公司 | Portable point type response detent condition detector |
| CN110850773A (en) * | 2019-11-14 | 2020-02-28 | 北京和利时系统工程有限公司 | Signal acquisition method and device, computer storage medium and electronic equipment |
| CN111016973A (en) * | 2019-12-28 | 2020-04-17 | 卡斯柯信号有限公司 | Interconnection subway beacon positioning processing system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107534456A (en) * | 2015-08-31 | 2018-01-02 | 旭化成微电子株式会社 | Demodulating equipment |
| CN107534456B (en) * | 2015-08-31 | 2020-02-07 | 旭化成微电子株式会社 | Demodulation device |
| CN106774275A (en) * | 2017-01-16 | 2017-05-31 | 湖南中车时代通信信号有限公司 | Visualize the test system and method for the control function of train operation monitoring device |
| CN108189869A (en) * | 2017-12-22 | 2018-06-22 | 交控科技股份有限公司 | The condominium region setting of CTCS-2 and CBTC and the method switched in condominium region |
| CN108189869B (en) * | 2017-12-22 | 2020-02-14 | 交控科技股份有限公司 | Common pipe region setting and switching method in common pipe region of CTCS-2 and CBTC |
| CN110138466A (en) * | 2019-05-31 | 2019-08-16 | 沈阳铁路信号有限责任公司 | Portable point type response detent condition detector |
| CN110138466B (en) * | 2019-05-31 | 2024-02-13 | 沈阳铁路信号有限责任公司 | Portable point type answering positioner state detector |
| CN110850773A (en) * | 2019-11-14 | 2020-02-28 | 北京和利时系统工程有限公司 | Signal acquisition method and device, computer storage medium and electronic equipment |
| CN111016973A (en) * | 2019-12-28 | 2020-04-17 | 卡斯柯信号有限公司 | Interconnection subway beacon positioning processing system |
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Application publication date: 20120425 |