CN102565621A - Detection device and detection method for cable status of transponder - Google Patents
Detection device and detection method for cable status of transponder Download PDFInfo
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- CN102565621A CN102565621A CN201210054281XA CN201210054281A CN102565621A CN 102565621 A CN102565621 A CN 102565621A CN 201210054281X A CN201210054281X A CN 201210054281XA CN 201210054281 A CN201210054281 A CN 201210054281A CN 102565621 A CN102565621 A CN 102565621A
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Abstract
The invention discloses a detection device and a detection method for a cable status of a transponder. The detection device is connected onto the output end of the transponder connected with a trackside electronic unit. The detection device comprises an acquisition module and a phase discrimination module, wherein the acquisition module is used for acquiring the voltage and the current of the output end of the trackside electronic unit; the phase discrimination module is used for comparing the phase of the acquired voltage with the phase of the acquired current; if the phase of the voltage is in advance of the phase of the current, a cable of the transponder is judged to be short-circuited; if the phase of the current is in advance of the phase of the voltage, whether the phase difference between the current and the voltage is less than or equal to a preset threshold value or not is judged; if the phase difference between the current and the voltage is less than or equal to the preset threshold value, the cable of the transponder is judged to be open-circuited; and if the phase difference between the current and the voltage is not less than or equal to the preset threshold value, the cable of the transponder is judged to be normal. According to the detection device for the cable status of the transponder, the cable status can be detected under the condition of long distance, and the open-circuited status, the short-circuited status and the normal status are correctly distinguished.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of pick-up unit and detection method of transponder cable status.
Background technology
Along with improving constantly of railway operation speed, density, active balise is improving the train conevying efficiency, is playing crucial effects aspect enhancing system security.
Active balise provides information such as route and temporary speed limitation order in real time to train, the control train operation.Shown in Figure 1 is the arrangement plan of TCC (Train Control Center, train controlling center), LEU (Lineside Electronic Unit, the other electronic unit of rail) and transponder.TCC transmits message in real time to LEU; LEU adopts safety, transparent transmission protocol, accomplishes the transmission of TCC message to transponder; ATP (Automatic Train Protection, train automatic safety device) is according to the transponder information Control driving that receives.
LEU is installed in indoor, is connected through the transponder cable with active balise.If open circuit or short trouble appear in transponder cable far-end, ATP does not receive the real-time packet of TCC, and train will temporary speed limitation or parking.Like this, influence the train conevying efficiency on the one hand, make troubles to malfunction elimination on the other hand.Therefore, the state of transponder cable (open circuit, short circuit, normal) measuring ability is indispensable aspect raising train conevying efficiency, enhanced system maintainability.
The state-detection of transponder cable is a technical barrier, and traditional detection method can not be implemented in long apart from accurately distinguishing three kinds of states under the situation.Three kinds of traditional detection methods are listed below:
The impedance magnitude detection method.At present, most of producers adopt the impedance magnitude of C6 (up serial ports bias voltage control interface, frequency is the sine wave of the 8.820 ± 0.1kHz) interface signal of measuring LEU to change the active balise cable status information that obtains.The advantage of this method is open circuit, short circuit, normal three kinds of states that can detect short distance transponder cable; Shortcoming is to long not enough apart from the open circuit/short circuit detectability, detects about tens meters of distance.
The pulse detection method.The pulse detection method is come to LEU reception and registration active balise cable status information through C4 (forbid that uplink message changes interface, realize forbidding that message changes in the BDU when train during through the Europe superscript transponder) interface signal that simulation produces LEU.The advantage of this method is to detect distance, reaches 3.5Km; Shortcoming is to distinguish open circuit, short-circuit condition, can only detect fault (open circuit or short circuit), normal condition.
The DC voltage detection method.The DC voltage electrical measuring method is judged cable fault through on the transponder cable, increasing DC source through back production voltage.This method can only be judged transponder cable open fault state.
The traditional detection method existence is grown apart from open circuit/short circuit detectability deficiency, can not be distinguished/defectives such as short-circuit condition.
Summary of the invention
The technical matters that the present invention will solve is a detection streamer state under the situation of long distance how, and right area divides open circuit, short circuit and normal condition.
In order to address the above problem, the invention provides a kind of pick-up unit of transponder cable status, said pick-up unit is connected the other electronic unit of rail and connects on the output terminal of said transponder, comprising:
Acquisition module is used to gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
The phase demodulation module is used for the voltage that comparison gathers and the phase place of electric current, if voltage-phase is ahead of current phase, then judges the transponder cable short circuit; If current phase is ahead of voltage-phase, judge then whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value, if then judge transponder cable open circuit, if not judging that then the transponder cable is normal.
Further, said acquisition module comprises:
Collecting unit is used to gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
The amplitude limit unit, the voltage, the electric current that are used for the collecting unit collection carry out amplitude limiting processing;
Filter unit is used for the voltage behind the amplitude limit, electric current are carried out filtering respectively;
Converting unit is used for converting filtered voltage, electric current into square-wave signal by sine wave signal.
Further, said phase demodulation module comparative voltage phase place and current phase are meant:
Said phase demodulation module is gathered said voltage square wave signal with the rising edge of said current square-wave signal; When the voltage that collects is confirmed voltage-phase leading current phase place during for high level; When the voltage that collects is confirmed current phase leading voltage phase place during for low level.
Further, said phase demodulation module judges whether phase differential between electric current and the voltage is less than or equal to predetermined threshold value and is meant:
Said phase demodulation module is made XOR with said voltage square wave signal and current square-wave signal and is handled and obtain the phase differential pulse; With this phase differential pulse of clock signal sampling; With sample count value and preset numeric ratio; If more than or equal to this numerical value, the phase differential of then judging between electric current and the voltage is less than or equal to predetermined threshold value; If less than this numerical value, then judge phase differential between electric current and the voltage greater than predetermined threshold value.
Further, when there was a plurality of output terminal that connects different transponders respectively in LEU, said acquisition module and phase demodulation module also included a plurality of, correspond respectively to different output terminals; Each acquisition module is gathered the voltage and current on the pairing output terminal respectively; The state of the transponder cable that each phase demodulation module is judged pairing output terminal respectively and connected.
The present invention also provides a kind of detection method of transponder cable status, comprising:
Gather voltage, electric current on the output terminal that the other electronic unit of rail connects said transponder;
The voltage of relatively being gathered and the phase place of electric current if voltage-phase is ahead of current phase, are then judged the transponder cable short circuit;
If current phase is ahead of voltage-phase, judge then whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value, if then judge transponder cable open circuit, if not judging that then the transponder cable is normal.
Further, the other electronic unit of said collection rail connects the voltage on the output terminal of said transponder, the step of electric current comprises:
Gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
Voltage, electric current to gathering carry out amplitude limiting processing;
Voltage behind the amplitude limit, electric current are carried out filtering respectively;
Convert filtered voltage, electric current into square-wave signal by sine wave signal.
Further, said comparative voltage phase place and current phase are meant:
Gather said voltage square wave signal with the rising edge of said current square-wave signal; When the voltage that collects is confirmed voltage-phase leading current phase place during for high level; When the voltage that collects is confirmed current phase leading voltage phase place during for low level.
Further, judge whether phase differential between electric current and the voltage is less than or equal to predetermined threshold value and is meant:
Said voltage square wave signal and current square-wave signal are made XOR to be handled and obtains the phase differential pulse; With this phase differential pulse of clock signal sampling; With sample count value and preset numeric ratio; If more than or equal to this numerical value, the phase differential of then judging between electric current and the voltage is less than or equal to predetermined threshold value; If less than this numerical value, then judge phase differential between electric current and the voltage greater than predetermined threshold value.
Further, when there is a plurality of output terminal that connects different transponders respectively in LEU, gather the voltage and current on the different output terminals respectively, the state of the transponder cable of judging this output terminal respectively and being connected according to the voltage and current of being gathered.
The breakthrough proposition of technical scheme of the present invention utilizes impedance phase reflection transponder cable status, only need utilize the message signals of cable transmission, can not realize that by any external signal the transponder cable status detects, and detects distance, can reach 2.5Km; Can accurately distinguish transponder cable open circuit, short circuit and normal three kinds of states.
Description of drawings
Fig. 1 is the arrangement plan of TCC, LEU and transponder;
Fig. 2 is a LEU end transponder cable resistance synoptic diagram;
Fig. 3 is the synoptic diagram of the object lesson of embodiment one;
Fig. 4 is that the physical circuit of embodiment one connects synoptic diagram.
Fig. 5 is the schematic flow sheet of detection method example of the transponder cable status of embodiment two.
Embodiment
To combine accompanying drawing and embodiment that technical scheme of the present invention is explained in more detail below.
Need to prove that if do not conflict, each characteristic among the embodiment of the invention and the embodiment can mutually combine, all within protection scope of the present invention.
Embodiment one, and a kind of pick-up unit of transponder cable status is connected the other electronic unit of rail and connects on the output terminal of said transponder, comprising:
Acquisition module is used to gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
The phase demodulation module is used for the voltage that comparison gathers and the phase place of electric current, if voltage-phase is ahead of current phase, then judges the transponder cable short circuit; If current phase is ahead of voltage-phase, judge then whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value, if then judge transponder cable open circuit, if not judging that then the transponder cable is normal.
In the present embodiment, said predetermined threshold value can be chosen according to notional result; Impedance phase potential difference (being the difference of voltage-phase and current phase) is obvious under short-circuit condition, the normal condition and under the open-circuit condition, during different cable length under short-circuit condition, the normal condition and under the open-circuit condition situation of impedance phase potential difference shown in table one:
Table one, impedance phase potential difference
In the practical application, choose under the normal condition with open-circuit condition under the intermediate value of impedance phase potential difference get final product as said predetermined threshold value.
In the present embodiment; Obtain the phase place that LEU holds the transponder cable resistance according to voltage
electric current of gathering
, impedance
is:
According to following formula, impedance phase is the difference of voltage-phase and current phase.
Shown in Figure 2 for LEU end transponder cable resistance synoptic diagram, obtain impedance phase information through detection streamer voltage and current signal.
Present embodiment be after the cable transmission theory having been carried out research, new departure of designing according to the situation of transponder cable.Theoretical according to cable transmission, the four-pole network matrix of coefficients of cable is:
Cable input terminal voltage V
1, the input end electric current I
1, input impedance Z
R1For:
Wherein,
Input impedance for transponder cable far-end; l
dTransmission length for cable; γ
dPropagation constant for cable; Z
CdCharacteristic impedance for cable.
When the transponder cable breaks down; Suppose: during open circuit; During
short circuit;
is under the 8.82KHz frequency; Calculate the phase place of transponder cable far-end open circuit, short circuit, LEU output terminal impedance when normally connecting; Can find out that at cable length be under 0～3500m condition, the phase propetry of transponder cable open circuit, short circuit, normal three kinds of states is very obvious.So, as long as can obtain the phase value of electric current, the phase relation between the voltage or impedance that LEU connects the output terminal of transponder, just can judge rightly out normally, open circuit, these three kinds of states of short circuit.
In the present embodiment, said acquisition module specifically can comprise:
Collecting unit is used to gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
The amplitude limit unit, the voltage, the electric current that are used for the collecting unit collection carry out amplitude limiting processing;
Filter unit is used for the voltage behind the amplitude limit, electric current are carried out filtering respectively;
Converting unit is used for converting filtered voltage, electric current into square-wave signal by sine wave signal.
Said converting unit can but be not limited to adopt zero balancing to convert voltage, electric current into square-wave signal by sine wave signal.Crossing zero balancing is meant: when voltage/current greater than 0 the time, and by greater than 0 moment output high level that becomes less than 0, voltage/current is less than 0, and by less than 0 moment output low level that changes into greater than 0.
In the present embodiment, said phase demodulation module comparative voltage phase place and current phase specifically can be meant:
Said phase demodulation module is gathered said voltage square wave signal with the rising edge of said current square-wave signal; When the voltage that collects is high level (can but be not limited to " 1 "), confirm voltage-phase leading current phase place, the transponder impedance phase is for just; When the voltage that collects is low level (can but be not limited to " 0 "), confirm current phase leading voltage phase place, promptly the transponder impedance phase is for negative.
During practical application, can adopt other mode to compare the phase differential between electric current and the voltage.
In the present embodiment, said phase demodulation module judges whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value and specifically can be meant:
Said phase demodulation module is made XOR with said voltage square wave signal and current square-wave signal and is handled and obtain the phase differential pulse; With this phase differential pulse of clock signal Clk sampling; With sample count value and preset numeric ratio; If more than or equal to this numerical value, the phase differential of then judging between electric current and the voltage is less than or equal to predetermined threshold value (being the cable open circuit); If less than this numerical value, then judge phase differential between electric current and the voltage greater than predetermined threshold value (being that cable is normal).
During practical application, can adopt other mode to judge whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value.
In the present embodiment, said phase demodulation module can also be worked as when judging the transponder cable short circuit, sends the cable short circuit signal to the other electronic unit of said rail; When judging transponder cable open circuit, send the cable open circuit signaling to the other electronic unit of said rail.
In the present embodiment, when there was a plurality of output terminal that connects different transponders respectively in LEU, said acquisition module and phase demodulation module also included a plurality of, correspond respectively to different output terminal (just corresponding to different transponders/transponder cable); Each acquisition module is gathered the voltage and current on the pairing output terminal respectively; The state of the transponder cable that each phase demodulation module is judged pairing output terminal respectively and connected.
Describe with a concrete example below, this example is as shown in Figure 3, has connected four transponders on the C interface of LEU (output terminal of connection transponder just mentioned above), transponder 1 ..., transponder 4.
Be example wherein with transponder 1, the voltage 1-3 and the electric current 1-4 of the output terminal that the collecting unit collection transponder 1 in the pick-up unit is connected, and carry out amplitude limiting processing; Acquisition module corresponding to transponder 1 in the pick-up unit obtains 8.82KHz sine voltage signal A after the filtering respectively to voltage, electric current; 8.82KHz sinusoidal current signal C; Carry out the zero passage comparison process then respectively, thereby obtain 8.82KHz square wave voltage signal B and 8.82KHz square wave current signal D; Phase demodulation module corresponding to transponder 1 in the pick-up unit is carried out phase discrimination processing to square wave voltage signal B and square wave current signal D; If judge the transponder cable open circuit between transponder 1 and LEU; Then send cable open circuit signaling 1-1 to the other electronic unit of rail; If judge the transponder cable short circuit between transponder 1 and LEU, then send cable short circuit signal 1-2 to the other electronic unit of rail.
The processing of other three transponders is similar; Gather voltage 4-3 and the electric current 4-4 of the output terminal that transponder 4 connected such as pick-up unit, and judge the state of the transponder cable between transponder 4 and LEU, if open circuit/short circuit then corresponding transmission cable open circuit signaling 4-1 or cable short circuit signal 4-2 are to LEU.
The circuit connecting relation of the pick-up unit of present embodiment is as shown in Figure 4, and the output terminal of LEU connects transponder through the transponder cable; The voltage B0 that said collecting unit is gathered is that the other electronic unit of said rail connects the voltage between the output terminal winding two ends of transponder; Said collecting unit also comprises a sample resistance R, is connected between voltage in the said output terminal winding the two ends higher end and transponder cable, and the electric current A0 that collecting unit is gathered is the electric current through this sample resistance R.Electric current A0, voltage B0 are obtained electric current A1, voltage B1 after through amplitude limit; Obtain sinusoidal current signal A2, sine voltage signal B2 through filtering again; Carried out 0 then and obtain square wave current signal A3, square wave voltage signal B3 after relatively, the logical process through the phase demodulation module obtains the output of transponder cable status at last.
The detection method of embodiment two, a kind of transponder cable status comprises:
Gather voltage, electric current on the output terminal that the other electronic unit of rail connects said transponder;
The voltage of relatively being gathered and the phase place of electric current if voltage-phase is ahead of current phase, are then judged the transponder cable short circuit;
If current phase is ahead of voltage-phase, judge then whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value, if then judge transponder cable open circuit, if not judging that then the transponder cable is normal.
In the present embodiment, the other electronic unit of said collection rail connects the voltage on the output terminal of said transponder, the step of electric current specifically can comprise:
Gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
Voltage, electric current to gathering carry out amplitude limiting processing;
Voltage behind the amplitude limit, electric current are carried out filtering respectively;
Convert filtered voltage, electric current into square-wave signal by sine wave signal.
In the present embodiment, said comparative voltage phase place and current phase specifically can be meant:
Gather said voltage square wave signal with the rising edge of said current square-wave signal; , the voltage that collects confirms voltage-phase leading current phase place when being high level (can but be not limited to " 1 "); , the voltage that collects confirms current phase leading voltage phase place when being low level (can but be not limited to " 0 ").
In the present embodiment, judge whether phase differential between electric current and the voltage is less than or equal to predetermined threshold value and specifically can be meant:
Said voltage square wave signal and current square-wave signal are made XOR to be handled and obtains the phase differential pulse; With this phase differential pulse of clock signal Clk sampling; With sample count value and preset numeric ratio; If more than or equal to this numerical value, the phase differential of then judging between electric current and the voltage is less than or equal to predetermined threshold value; If less than this numerical value, then judge phase differential between electric current and the voltage greater than predetermined threshold value.
In the present embodiment, when there is a plurality of output terminal that connects different transponders respectively in LEU, gather the voltage and current on the different output terminals respectively, the state of the transponder cable of judging this output terminal respectively and being connected according to the voltage and current of being gathered.
According to judging that through amplitude limit, filtering and the electric current, the voltage that convert square-wave signal into an object lesson of transponder cable status is as shown in Figure 5 after gathering, process comprises:
S1, gather said voltage square wave signal with the rising edge of said current square-wave signal; Judge whether voltage is " 1 "; If, definite response device cable short circuit then; If not, then carry out step S2;
S2, said voltage square wave signal and current square-wave signal are made XOR handle and obtain the phase differential pulse; With this phase differential pulse of clock signal Clk sampling;
S3, whether judge the sample count value more than or equal to default value, if, definite response device cable open circuit then; If not, then definite response device cable is normal.
Other realizes that details can be referring to embodiment one.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (10)
1. the pick-up unit of a transponder cable status is characterized in that, said pick-up unit is connected the other electronic unit of rail and connects on the output terminal of said transponder, comprising:
Acquisition module is used to gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
The phase demodulation module is used for the voltage that comparison gathers and the phase place of electric current, if voltage-phase is ahead of current phase, then judges the transponder cable short circuit; If current phase is ahead of voltage-phase, judge then whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value, if then judge transponder cable open circuit, if not judging that then the transponder cable is normal.
2. device as claimed in claim 1 is characterized in that, said acquisition module comprises:
Collecting unit is used to gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
The amplitude limit unit, the voltage, the electric current that are used for the collecting unit collection carry out amplitude limiting processing;
Filter unit is used for the voltage behind the amplitude limit, electric current are carried out filtering respectively;
Converting unit is used for converting filtered voltage, electric current into square-wave signal by sine wave signal.
3. device as claimed in claim 2 is characterized in that, said phase demodulation module comparative voltage phase place and current phase are meant:
Said phase demodulation module is gathered said voltage square wave signal with the rising edge of said current square-wave signal; When the voltage that collects is confirmed voltage-phase leading current phase place during for high level; When the voltage that collects is confirmed current phase leading voltage phase place during for low level.
4. device as claimed in claim 2 is characterized in that, said phase demodulation module judges whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value and is meant:
Said phase demodulation module is made XOR with said voltage square wave signal and current square-wave signal and is handled and obtain the phase differential pulse; With this phase differential pulse of clock signal sampling; With sample count value and preset numeric ratio; If more than or equal to this numerical value, the phase differential of then judging between electric current and the voltage is less than or equal to predetermined threshold value; If less than this numerical value, then judge phase differential between electric current and the voltage greater than predetermined threshold value.
5. according to any one of claims 1 to 4 device is characterized in that:
When there was a plurality of output terminal that connects different transponders respectively in LEU, said acquisition module and phase demodulation module also included a plurality of, correspond respectively to different output terminals; Each acquisition module is gathered the voltage and current on the pairing output terminal respectively; The state of the transponder cable that each phase demodulation module is judged pairing output terminal respectively and connected.
6. the detection method of a transponder cable status comprises:
Gather voltage, electric current on the output terminal that the other electronic unit of rail connects said transponder;
The voltage of relatively being gathered and the phase place of electric current if voltage-phase is ahead of current phase, are then judged the transponder cable short circuit;
If current phase is ahead of voltage-phase, judge then whether the phase differential between electric current and the voltage is less than or equal to predetermined threshold value, if then judge transponder cable open circuit, if not judging that then the transponder cable is normal.
7. method as claimed in claim 6 is characterized in that, the other electronic unit of said collection rail connects the voltage on the output terminal of said transponder, the step of electric current comprises:
Gather voltage, electric current on the other electronic unit output terminal of the rail that is connected;
Voltage, electric current to gathering carry out amplitude limiting processing;
Voltage behind the amplitude limit, electric current are carried out filtering respectively;
Convert filtered voltage, electric current into square-wave signal by sine wave signal.
8. method as claimed in claim 7 is characterized in that, said comparative voltage phase place and current phase are meant:
Gather said voltage square wave signal with the rising edge of said current square-wave signal; When the voltage that collects is confirmed voltage-phase leading current phase place during for high level; When the voltage that collects is confirmed current phase leading voltage phase place during for low level.
9. method as claimed in claim 7 is characterized in that, judges whether phase differential between electric current and the voltage is less than or equal to predetermined threshold value and is meant:
Said voltage square wave signal and current square-wave signal are made XOR to be handled and obtains the phase differential pulse; With this phase differential pulse of clock signal sampling; With sample count value and preset numeric ratio; If more than or equal to this numerical value, the phase differential of then judging between electric current and the voltage is less than or equal to predetermined threshold value; If less than this numerical value, then judge phase differential between electric current and the voltage greater than predetermined threshold value.
10. like each described method in the claim 6 to 9, it is characterized in that:
When there is a plurality of output terminal that connects different transponders respectively in LEU, gather the voltage and current on the different output terminals respectively, the state of the transponder cable of judging this output terminal respectively and being connected according to the voltage and current of being gathered.
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Cited By (10)
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| CN102818968A (en) * | 2012-09-07 | 2012-12-12 | 北京交大思诺科技有限公司 | System and method for detecting transponder cable |
| CN104297609A (en) * | 2013-07-19 | 2015-01-21 | 瑞昱半导体股份有限公司 | Detection circuit and method for determining connecting state of first and second pins |
| CN105119667A (en) * | 2015-07-14 | 2015-12-02 | 河南蓝信科技股份有限公司 | Lineside electronic unit (LEU) tester |
| US9500692B2 (en) | 2013-07-11 | 2016-11-22 | Realtek Semiconductor Corp. | Detecting circuit and detecting method for determining connection status between first pin and second pin |
| CN107005098A (en) * | 2017-03-15 | 2017-08-01 | 香港应用科技研究院有限公司 | Wireless power transmitter |
| CN109884450A (en) * | 2019-03-19 | 2019-06-14 | 卡斯柯信号有限公司 | A kind of device and method detecting transponder cable status |
| CN110161354A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault method of discrimination and device |
| CN110928274A (en) * | 2019-12-09 | 2020-03-27 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Test system of LEU equipment |
| CN111722969A (en) * | 2020-06-28 | 2020-09-29 | 黄骅市交大思诺科技有限公司 | LEU complete machine automatic test system |
| CN112653088A (en) * | 2020-12-17 | 2021-04-13 | 卡斯柯信号有限公司 | Transponder cable self-adaptive short-circuit protection method of ground electronic unit |
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Application publication date: 20120711 |