CN109194368B - Method for transmitting non-track circuit signal by same cable of track circuit signal cable - Google Patents
Method for transmitting non-track circuit signal by same cable of track circuit signal cable Download PDFInfo
- Publication number
- CN109194368B CN109194368B CN201810969715.6A CN201810969715A CN109194368B CN 109194368 B CN109194368 B CN 109194368B CN 201810969715 A CN201810969715 A CN 201810969715A CN 109194368 B CN109194368 B CN 109194368B
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- track circuit
- circuit
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- track
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/066—Telephone sets adapted for data transmision
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
A method for transmitting non-track circuit signals by a track circuit signal cable in the same cable comprises the steps of arranging track circuit equipment and non-track circuit equipment, and modulating non-track circuit signals generated by non-track circuit outdoor equipment into non-track circuit carrier frequency signals; transmitting non-track circuit carrier frequency signals to the indoor by using track circuit signal cables; the non-track circuit indoor equipment processes the restored non-track circuit signal. The invention realizes the same-cable transmission of track circuit signals and non-track circuit signals, and non-track circuit equipment does not need to additionally lay special signal cables, thereby saving raw materials, reducing cost, reducing engineering construction and reducing the workload of later maintenance.
Description
Technical Field
The invention belongs to the technical field of railway signal systems, and particularly relates to a method for transmitting non-track circuit signals by a track circuit signal cable in the same cable.
Background
The steel rail is divided into a plurality of sections, the trains are scheduled to pass according to the idle or occupied condition of each section, and the signal system controls the trains to travel. Usually, the railway signal system uses the track circuit to check the position condition of the train, and judges whether the section is free or occupied, so as to provide the running condition for the interlocking system. The track circuit is a key device in a railway signal system and is widely used in the field of track traffic. The track circuit comprises a transmitter for generating track circuit signals and a receiver for receiving and processing the track circuit signals and outputting the idle or occupied sections, wherein the track circuit signals generated by the transmitter sequentially pass through a lightning protection cable analog network at a transmitting end, a track circuit signal cable (namely an SPT digital signal cable) and a matching transformer at the transmitting end to a steel rail, and then pass through the matching transformer at a receiving end, the track circuit signal cable and the lightning protection cable analog network at the receiving end from the steel rail, and are received and processed by the receiver. The track circuit is laid from the outdoor to the indoor by adopting a special track circuit signal cable, and is connected with indoor and outdoor equipment of the track circuit in a signal mode; and the track circuit equipment signals are transmitted by adopting a track circuit signal cable.
The present invention relates to a method for maintaining signal cables of non-track circuit equipment, and more particularly, to a method for maintaining signal cables of non-track circuit equipment, which is used for signal transmission between indoor equipment and outdoor equipment, and is characterized in that the signal cables are laid on the non-track circuit equipment, and the signal cables are laid on the non-track circuit equipment.
Disclosure of Invention
The invention provides a method for transmitting non-track circuit equipment signals by using a track circuit signal cable in the same cable, aiming at the problems in the prior art.
The technical scheme for solving the technical problem of the invention is as follows:
a method for transmitting non-track circuit signals by a track circuit signal cable in the same cable is characterized by comprising the following steps:
s11: arranging track circuit equipment and laying a track circuit signal cable; the track circuit equipment comprises track circuit outdoor equipment and track circuit indoor equipment, and the track circuit indoor equipment and the track circuit outdoor equipment are connected by a track circuit signal cable;
s12: setting non-track circuit equipment; the non-track circuit equipment comprises non-track circuit indoor equipment and non-track circuit outdoor equipment;
s13: modulating a non-track circuit signal generated by the non-track circuit outdoor equipment into a non-track circuit carrier frequency signal; the carrier frequency of the non-track circuit carrier frequency signal is different from the carrier frequency of the track circuit signal;
s14: transmitting non-track circuit carrier frequency signals to the indoor by using track circuit signal cables;
s15: separating and restoring the non-track circuit carrier frequency signal into a non-track circuit signal indoors;
s16: and the non-track circuit indoor equipment processes the restored non-track circuit signal.
The further technical scheme of the invention also comprises the following steps:
s21: a modulation unit is arranged in the non-track circuit outdoor equipment and is used for modulating the non-track circuit signal into a non-track circuit carrier frequency signal suitable for the track circuit signal cable transmission;
s22: an outdoor isolator is arranged and used for loading a non-track circuit carrier frequency signal onto the track circuit signal cable for transmission;
s23: an indoor isolator is arranged for separating the non-track circuit carrier frequency signal from the track circuit signal cable;
s24: the demodulation unit is used for receiving the non-track circuit carrier frequency signal separated by the indoor isolator and restoring the non-track circuit carrier frequency signal into a non-track circuit signal;
s25: and the non-track circuit indoor equipment receives the restored non-track circuit signal and performs operation processing.
The further technical scheme of the invention also comprises the following steps:
s31: a direct current power supply module is arranged in the demodulation unit and used for providing direct current power supply for non-track circuit outdoor equipment;
s32: a power supply synthesis circuit is arranged in the indoor isolator or the demodulation unit and is used for loading a direct current power supply to the track circuit signal cable for transmission;
s33: the outdoor isolator or the modulation unit is internally provided with a power supply separation circuit which is used for separating a direct-current power supply from a track circuit signal cable;
s34: two blocking units are arranged on the track circuit signal cable in series, wherein one blocking unit isolates a direct current power supply to enter the track circuit indoor equipment, and the other blocking unit isolates the direct current power supply to enter the track circuit indoor equipment.
The further technical scheme of the invention is as follows:
the indoor isolator and the outdoor isolator are internally provided with frequency shift circuits with frequencies corresponding to the carrier frequency signals of the non-track circuit signals, and the frequency shift circuits load or separate the carrier frequency signals of the non-track circuit; the frequency shift circuit isolates track circuit signals to enter non-track circuit indoor equipment or non-track circuit outdoor equipment.
The further technical scheme of the invention is as follows:
and a high-frequency isolation circuit is arranged in the indoor isolator and/or the outdoor isolator and is used for isolating the non-track circuit carrier frequency signal from entering track circuit indoor equipment and/or track circuit outdoor equipment.
The further technical scheme of the invention is as follows:
the frequency of the frequency shift circuit is set to be 20KHz to 100 KHz.
The invention has the positive effects that: the method modulates the non-track circuit signal into a non-track circuit carrier frequency signal suitable for track circuit signal cable transmission, loads the non-track circuit carrier frequency signal onto the track circuit signal cable, transmits the non-track circuit carrier frequency signal to the indoor through the track circuit signal cable, separates the non-track circuit equipment carrier frequency signal, and restores the non-track circuit equipment carrier frequency signal into a non-track circuit equipment signal, thereby realizing the co-cable transmission of the track circuit signal and the non-track circuit signal, the non-track circuit equipment does not need to additionally lay a signal special cable, saves raw materials, reduces cost, reduces engineering construction and reduces the workload of later maintenance.
The invention will be further described with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a system schematic block diagram of the method of the present invention.
Detailed Description
As shown in fig. 1 in conjunction with a system schematic diagram, a method for transmitting non-track circuit signals by a track circuit signal cable in the same cable comprises the following steps:
s11: arranging track circuit equipment and laying a track circuit signal cable; the track circuit equipment comprises track circuit outdoor equipment and track circuit indoor equipment, and the track circuit indoor equipment and the track circuit outdoor equipment are connected by a track circuit signal cable;
s12: setting non-track circuit equipment; the non-track circuit equipment comprises non-track circuit indoor equipment and non-track circuit outdoor equipment;
s13: modulating a non-track circuit signal generated by the non-track circuit outdoor equipment into a non-track circuit carrier frequency signal; the carrier frequency of the non-track circuit carrier frequency signal is different from the carrier frequency of the track circuit signal;
s14: transmitting non-track circuit carrier frequency signals to the indoor by using track circuit signal cables;
s15: separating and restoring the non-track circuit carrier frequency signal into a non-track circuit signal indoors;
s16: and the non-track circuit indoor equipment processes the restored non-track circuit signal.
As mentioned above, the method of the invention combines the outdoor track circuit signal and the non-track circuit signal together and transmits the signals to the indoor through the track circuit signal cable, separates the track circuit signal and the non-track circuit carrier frequency signal on the track circuit signal cable in the indoor, and transmits the signals to the track circuit indoor equipment and the non-track circuit indoor equipment for processing respectively, thus realizing the transmission of the track circuit signal and the non-track circuit signal by using the track circuit signal cable and the same cable. The frequency of the track circuit signal is 1700-2600 Hz, and the frequency of the frequency shift circuit is set to be 20 KHz-100 KHz.
The further technical scheme of the invention comprises the following steps:
s21: a modulation unit is arranged in the non-track circuit outdoor equipment and is used for modulating the non-track circuit signal into a non-track circuit carrier frequency signal suitable for the track circuit signal cable transmission;
s22: an outdoor isolator is arranged and used for loading a non-track circuit carrier frequency signal onto the track circuit signal cable for transmission;
s23: an indoor isolator is arranged for separating the non-track circuit carrier frequency signal from the track circuit signal cable;
s24: the demodulation unit is used for receiving the non-track circuit carrier frequency signal separated by the indoor isolator and restoring the non-track circuit carrier frequency signal into a non-track circuit signal;
s25: and the non-track circuit indoor equipment receives the restored non-track circuit signal and performs operation processing.
The invention relates to a method for transmitting non-track circuit signals by a track circuit signal cable in the same cable, which comprises the steps of arranging an isolator and a modulation and demodulation unit; when the isolator and the modulation and demodulation unit are arranged outdoors, the modulation and demodulation unit is used for modulating the non-track circuit signal into a non-track circuit carrier frequency signal suitable for track circuit signal cable transmission, and loading the non-track circuit carrier frequency signal onto a track circuit signal cable for cable transmission with the track circuit signal; the isolator and the modulation and demodulation unit are arranged indoors and used for separating signals transmitted on the track circuit signal cable into track circuit signals and non-track circuit carrier frequency signals and restoring the non-track circuit carrier frequency signals into the non-track circuit signals. When the signal is outdoors, the modulation and demodulation unit is used for modulating the non-track circuit signal into a non-track circuit carrier frequency signal; when the signal is indoor, the modulation and demodulation unit is used for restoring the non-track circuit carrier frequency signal into a non-track circuit signal.
The further technical scheme of the invention is as follows:
the indoor isolator and the outdoor isolator are internally provided with frequency shift circuits with frequencies corresponding to the carrier frequency signals of the non-track circuit signals, and the frequency shift circuits load or separate the carrier frequency signals of the non-track circuit; the frequency shift circuit isolates track circuit signals to enter non-track circuit indoor equipment or non-track circuit outdoor equipment.
One end of the frequency shift circuit is connected with a track circuit signal cable, and the other end of the frequency shift circuit is connected with the modulation and demodulation unit and is used for passing a non-track circuit carrier frequency signal and preventing the track circuit signal from entering non-track circuit equipment; the isolator also comprises a high-frequency isolation circuit, one end of the high-frequency isolation circuit is connected with the track circuit signal cable, and the other end of the high-frequency isolation circuit is connected with a track circuit signal equipment port and used for passing track circuit signals and preventing non-track circuit carrier frequency signals from entering track circuit equipment. When the non-track circuit outdoor equipment is outdoors, the modulation and demodulation module is connected with the non-track circuit outdoor equipment, a non-track circuit signal generated by the non-track circuit outdoor equipment is modulated into a non-track circuit carrier frequency signal by the modulation and demodulation module, the frequency of the carrier frequency signal corresponds to the frequency of the frequency shift circuit and is different from the frequency of the track circuit signal, the frequency shift circuit can enable the non-track circuit carrier frequency signal to pass through and be loaded on a track circuit signal cable connected with the frequency shift circuit for transmission, but the track circuit signal frequency does not correspond to the frequency of the frequency shift circuit, so that the non-track circuit signal cannot reach the modulation and demodulation unit through the frequency shift circuit. When the frequency shift circuit is indoors, the frequency of the frequency shift circuit corresponds to the carrier frequency of the non-track circuit signal, so that the non-track circuit carrier frequency signal on the track circuit signal cable can pass through the frequency shift circuit and is transmitted to the modulation and demodulation unit, namely, the non-track circuit carrier frequency signal is separated from the track circuit signal cable and is transmitted to the modulation and demodulation unit, and the modulation and demodulation unit restores the non-track circuit carrier frequency signal into the non-track circuit signal; the frequency of the track circuit signal does not correspond to the frequency of the frequency shift circuit, and the frequency shift circuit can prevent the track circuit signal from reaching the modulation and demodulation unit.
And a high-frequency isolation circuit is arranged in the indoor isolator and/or the outdoor isolator and is used for isolating the non-track circuit carrier frequency signal from entering track circuit indoor equipment and/or track circuit outdoor equipment.
The frequency of the high-frequency isolation circuit corresponds to the frequency of the track circuit signal, but is different from the carrier frequency of the non-track circuit signal, so that the high-frequency isolation circuit can effectively pass through the track circuit signal and simultaneously can prevent the non-track circuit carrier frequency signal from entering track circuit indoor equipment or outdoor equipment.
The further technical scheme of the invention is as follows:
s31: a direct current power supply module is arranged in the demodulation unit and used for providing direct current power supply for non-track circuit outdoor equipment;
s32: a power supply synthesis circuit is arranged in the indoor isolator or the demodulation unit and is used for loading a direct current power supply to the track circuit signal cable for transmission;
s33: the outdoor isolator or the modulation unit is internally provided with a power supply separation circuit which is used for separating a direct-current power supply from a track circuit signal cable;
s34: two blocking units are arranged on the track circuit signal cable in series, wherein one blocking unit isolates a direct current power supply to enter the track circuit indoor equipment, and the other blocking unit isolates the direct current power supply to enter the track circuit indoor equipment.
The method comprises a power supply circuit, wherein one end of the power supply circuit is connected with a track circuit signal cable, the other end of the power supply circuit is connected with a modulation and demodulation unit, when the power supply circuit is indoors, the power supply circuit is used for loading a direct current power supply to the track circuit signal cable, and when the power supply circuit is outdoors, the power supply circuit separates the direct current power supply from the track circuit signal cable and transmits the direct current power supply to non-track circuit equipment for use by the non-track circuit outdoor equipment. The power supply circuit may also be provided in the modem unit. The power supply used by the non-track circuit outdoor equipment is also transmitted by the track circuit signal cable. When the direct-current power supply is used outdoors, the direct-current power supply is separated from the track circuit signal cable and is used for non-track circuit outdoor equipment, namely, the power supply used by the non-track circuit outdoor equipment is also transmitted by the track circuit signal cable and the same cable.
The isolator also comprises a blocking unit which is arranged between the track circuit signal cable and the track circuit equipment in series and is used for isolating the direct-current power supply from entering the track circuit equipment; when the direct current power supply is indoors, the direct current power supply is isolated by the blocking unit and enters the track circuit indoor equipment, and when the direct current power supply is outdoors, the direct current power supply is isolated by the blocking unit and enters the track circuit outdoor equipment. The direct current blocking unit is mainly used for isolating a direct current power supply from entering the track circuit indoor equipment and the track circuit outdoor equipment from a track circuit signal cable, and meanwhile, the direct current blocking unit does not affect transmission of track circuit signals between the track circuit indoor equipment and the track circuit outdoor equipment. As shown in fig. 1, the blocking unit is a blocking capacitor serially connected between a signal cable port of the track circuit and a port of the track circuit device. The capacity of the dc blocking capacitance C is selected to be 50 uF.
The further technical scheme of the invention is as follows: a direct current power supply module is arranged in the isolator or the modulation and demodulation unit and is connected to the power supply circuit; when indoor, the signal cable is transmitted to the outdoor through the track circuit for providing direct current power supply for non-track circuit outdoor equipment. The power module can be arranged in the isolator or the modulation and demodulation unit, and can also be provided by other special direct current power supplies as long as the direct current power supplies can be provided and transmitted through the power circuit.
The power supply circuit shown in fig. 1 is composed of a third inductor L3 and a second capacitor C2, wherein a common end is formed by connecting the third inductor L3 and one end of the second capacitor C2 in parallel to form a common end connected to a track circuit signal cable, the other end of the third inductor L3 is connected to a dc power supply module in the modem unit, and the other end of the second capacitor C2 is connected to the modem circuit of the modem unit. The second capacitance C2=10uF and the third inductance L3=20 mH. The third inductor L3 is used for passing through the DC power supply and preventing the non-track circuit carrier frequency signal from passing through, and the second capacitor C2 is used for passing through the non-track circuit carrier frequency signal and preventing the DC power supply from passing through.
As shown in fig. 1, in the frequency shift circuit, after a first capacitor C1 is connected in parallel with a first inductor L1, one end of the frequency shift circuit is connected to a track circuit signal cable, the other end of the frequency shift circuit is connected in series with a second inductor L2, and the other end of the second inductor L2 is connected to a modulation-demodulation circuit of a demodulation unit and a dc power supply module. The first capacitor C1 and the first inductor L1 form a parallel resonant circuit, the frequency of which is selected to correspond to the carrier frequency of the non-track circuit, and is used for passing the carrier frequency signal of the non-track circuit, wherein the first inductor L1=100mH, the first capacitor C1=63.3nF, and the second inductor L2 is used for preventing the carrier frequency signal of the track circuit from passing, and wherein the second inductor L2=292 uH.
As shown in fig. 1, the high-frequency isolation circuit is provided with a resonant circuit in series between a track circuit equipment port and a node where a frequency shift circuit and a power supply circuit are connected to a track circuit signal cable port, is positioned on the track circuit equipment port side, and comprises two resonant circuits, wherein one resonant circuit is formed by connecting a fourth inductor L4 and a fourth capacitor C4 in parallel and is used for preventing a non-track circuit carrier frequency signal from passing through and allowing a track circuit signal to pass through (1700 and 2000HZ signals), the fourth inductor L4=0.5mH, and C5=32 nF; the other resonant circuit is formed by a fifth inductor L5 and a fifth capacitor C5 which are connected in parallel to form a resonant circuit, the non-track circuit carrier frequency signal is prevented from passing through and the track circuit signal is allowed to pass through (2300 and 2600 HZ), the fifth inductor L5=0.5mH, and the fifth capacitor C5=32 nF; the two resonant circuits are used to pass track circuit signals at different frequencies (1700,2000,2300,2600 HZ) and block non-track circuit carrier frequency signals (20k-100kHz), respectively. When the indoor modulation and demodulation circuit is applied indoors, the demodulation unit comprises a direct current power supply module and a modulation and demodulation circuit, the direct current power supply module is used for generating a direct current power supply and is connected with an inductor L3 of a power supply circuit, power is supplied to equipment outside a non-rail circuit through a signal cable of a rail circuit, and the modulation and demodulation circuit restores a carrier frequency signal of the non-rail circuit into a non-rail circuit signal and supplies the non-rail circuit signal to indoor equipment of the non-rail circuit for processing.
The track circuit signal cable is an SPT digital signal cable, and of course, any cable suitable for track circuit signal transmission may be selected.
Claims (3)
1. A method for in-line transmission of non-track circuit signals using track circuit signal cables, comprising the steps of:
s11: arranging track circuit equipment and laying a track circuit signal cable; the track circuit equipment comprises track circuit outdoor equipment and track circuit indoor equipment, and the track circuit indoor equipment and the track circuit outdoor equipment are connected by a track circuit signal cable;
s12: setting non-track circuit equipment; the non-track circuit equipment comprises non-track circuit indoor equipment and non-track circuit outdoor equipment;
s13: modulating a non-track circuit signal generated by the non-track circuit outdoor equipment into a non-track circuit carrier frequency signal; the carrier frequency of the non-track circuit carrier frequency signal is different from the carrier frequency of the track circuit signal;
s14: transmitting non-track circuit carrier frequency signals to the indoor by using track circuit signal cables;
s15: separating and restoring the non-track circuit carrier frequency signal into a non-track circuit signal indoors;
s16: the non-track circuit indoor equipment processes the restored non-track circuit signals;
s21: a modulation unit is arranged in the non-track circuit outdoor equipment and is used for modulating the non-track circuit signal into a non-track circuit carrier frequency signal suitable for the track circuit signal cable transmission;
s22: an outdoor isolator is arranged and used for loading a non-track circuit carrier frequency signal to the track circuit signal cable for transmission;
s23: providing an indoor isolator for separating said non-track circuit carrier frequency signal from said track circuit signal cable;
s24: the demodulation unit is used for receiving the non-track circuit carrier frequency signal separated by the indoor isolator and restoring the non-track circuit carrier frequency signal into a non-track circuit signal;
s25: the non-track circuit indoor equipment receives the restored non-track circuit signal and performs operation processing;
a high-frequency isolation circuit and a frequency shift circuit are arranged in the outdoor isolator of S22 and the indoor isolator of S23; the frequency shift circuit is characterized in that one end of the frequency shift circuit is connected with a track circuit signal cable after a first capacitor and a first inductor are connected in parallel, the other end of the frequency shift circuit is connected with a second inductor in series, and the other end of the second inductor is connected with a modulation-demodulation circuit and a direct-current power supply module of a demodulation unit; the high-frequency isolation circuit is connected between the track circuit equipment port and the node of the frequency shift circuit and the power supply circuit connected with the track circuit signal cable port through the resonance circuit in series, is positioned on the track circuit equipment port side, and comprises two resonance circuits, wherein one resonance circuit is formed by connecting a fourth inductor and a fourth capacitor in parallel, and the other resonance circuit is formed by connecting a fifth inductor and a fifth capacitor in parallel.
2. The method of claim for in-line transmission of non-track circuit signals using track circuit signal cables, comprising the steps of:
s31: a direct current power supply module is arranged in the demodulation unit and used for providing direct current power supply for non-track circuit outdoor equipment;
s32: a power supply synthesis circuit is arranged in the indoor isolator or the demodulation unit and is used for loading a direct current power supply to the track circuit signal cable for transmission;
s33: the outdoor isolator or the modulation unit is internally provided with a power supply separation circuit which is used for separating a direct-current power supply from a track circuit signal cable;
s34: two blocking units are arranged on the track circuit signal cable in series, wherein one blocking unit isolates a direct current power supply to enter the track circuit indoor equipment, and the other blocking unit isolates the direct current power supply to enter the track circuit indoor equipment.
3. The method of claim 1 for in-line transmission of non-track circuit signals over a track circuit signal cable, comprising: the frequency of the frequency shift circuit is set to be 20KHz to 100 KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969715.6A CN109194368B (en) | 2018-08-23 | 2018-08-23 | Method for transmitting non-track circuit signal by same cable of track circuit signal cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969715.6A CN109194368B (en) | 2018-08-23 | 2018-08-23 | Method for transmitting non-track circuit signal by same cable of track circuit signal cable |
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| CN109194368A CN109194368A (en) | 2019-01-11 |
| CN109194368B true CN109194368B (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810969715.6A Active CN109194368B (en) | 2018-08-23 | 2018-08-23 | Method for transmitting non-track circuit signal by same cable of track circuit signal cable |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115208321B (en) * | 2022-07-12 | 2023-04-11 | 固安信通信号技术股份有限公司 | Phase modulation method, demodulation algorithm and application of track circuit characteristic signal |
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| CN2601484Y (en) * | 2003-03-31 | 2004-01-28 | 杨世武 | Digital coding track circuit device |
| CN201283879Y (en) * | 2008-10-06 | 2009-08-05 | 北京全路通信信号研究设计院 | Outdoor isolator |
| CN105857342A (en) * | 2016-04-22 | 2016-08-17 | 北京永列科技有限公司 | Power supply and communication superposition method for axle counting system |
| CN106184286A (en) * | 2016-09-09 | 2016-12-07 | 北京和利时系统工程有限公司 | A kind of frequency shift modulated track circuit system |
| CN206928820U (en) * | 2017-06-22 | 2018-01-26 | 中车唐山机车车辆有限公司 | Rail vehicle switchs controlling device for doors and rail vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101471676B1 (en) * | 2008-12-30 | 2014-12-10 | 에릭슨 엘지 주식회사 | Cell management method and mobile telecommunication system for the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2601484Y (en) * | 2003-03-31 | 2004-01-28 | 杨世武 | Digital coding track circuit device |
| CN201283879Y (en) * | 2008-10-06 | 2009-08-05 | 北京全路通信信号研究设计院 | Outdoor isolator |
| CN105857342A (en) * | 2016-04-22 | 2016-08-17 | 北京永列科技有限公司 | Power supply and communication superposition method for axle counting system |
| CN106184286A (en) * | 2016-09-09 | 2016-12-07 | 北京和利时系统工程有限公司 | A kind of frequency shift modulated track circuit system |
| CN206928820U (en) * | 2017-06-22 | 2018-01-26 | 中车唐山机车车辆有限公司 | Rail vehicle switchs controlling device for doors and rail vehicle |
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| CN109194368A (en) | 2019-01-11 |
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