A non-contact track frequency-shift signal online monitoring method and system

Abstract

The application discloses a kind of non-contact track frequency shift signal online monitoring method and system, applied to intelligent monitoring technical field, method includes: receiving first measured voltage and second measured voltage;First measured voltage and second measured voltage are input first conditioning circuit by first transmission line, receive the first output voltage output by first conditioning circuit, and the parallel transmission line formed after first measured voltage and second measured voltage are connected in parallel by second transmission line and third transmission line are input second conditioning circuit, receive the second output voltage output by second conditioning circuit;According to first output voltage and second output voltage, calculate first measured voltage.The application is realized by the way of double-path simultaneous monitoring, reduces the influence of the related capacitance value change caused by environmental conditions on monitoring result, to effectively improve monitoring precision, and then provides solid foundation for non-contact frequency shift signal back-end processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent monitoring, in particular to a non-contact track frequency shift signal online monitoring method and system. BACKGROUND

[0002] The online monitoring of track frequency shift sending and receiving signals is an important part of the railway signal centralized monitoring system, and directly affects the safety of train operation. The existing contact type frequency shift signal monitoring needs to access the signal loop, although the monitoring module requires high resistance and high isolation input, but there is still a risk of affecting the signal loop due to short circuit of the monitoring module. With the development of non-contact voltage measurement technology, non-contact online monitoring of track frequency shift signals has become a major trend, and each bureau has clearly required that new stations must use non-contact monitoring. The existing non-contact voltage measurement technology is mainly divided into two categories, the first category is based on the solution of the coupling capacitor, which needs to accurately measure the input capacitor, and it is difficult to popularize and apply in engineering field, the second category of non-contact voltage measurement technology is based on the injection of known signals for channel detection, which eliminates the influence of coupling capacitor change on the measurement result. The application of non-contact voltage measurement technology in the railway signal monitoring system is still in the exploratory stage, and the measurement result of the trial module is greatly affected by the placement position of the measured signal line and the cable material, which needs to be fully sealed after secondary calibration on site, and the practicability is poor. The second category of method has been verified in the detection of power frequency voltage, but in the existing research results, this method is measured in the way of single wire through the core, and in the measurement of long distance signal transmission loop similar to frequency shift signal, the "floating ground" phenomenon occurs, which affects the measurement result. At the same time, the measurement result is greatly affected by the distributed capacitance of the transmission line and the printed board, especially when the online monitoring sensor considers electromagnetic compatibility and other issues, it usually uses multi-layer board, at this time the interlayer capacitance value of the printed board cannot be ignored, and the capacitance acting on the sensor will form a "zero point"; the distributed capacitance will change due to device working heat and other reasons during long time online operation, resulting in drift of the measurement zero point. SUMMARY

[0003] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a non-contact track frequency shift signal online monitoring method and system.

[0004] In a first aspect, the embodiments of the present application provide a non-contact track frequency shift signal online monitoring method, comprising:

[0005] The sensing layer copper pipe is sleeved on the L signal line and the N signal line;

[0006] The voltage of the sensing layer copper pipe of the L signal line is received as a first measured voltage, and the voltage of the sensing layer copper pipe of the N signal line is received as a second measured voltage;

[0007] The first measured voltage and the second measured voltage are input into a first conditioning circuit through a first transmission line, the first conditioning circuit receives a first output voltage output by the first conditioning circuit, and the first measured voltage and the second measured voltage are input into a second conditioning circuit through a parallel transmission line formed by the second transmission line and the third transmission line in parallel, the second conditioning circuit receives a second output voltage output by the second conditioning circuit; the structure and device of the first conditioning circuit and the second conditioning circuit are strictly the same; the first transmission line, the second transmission line and the third transmission line are completely the same in layout;

[0008] The first measured voltage is calculated according to the first output voltage and the second output voltage.

[0009] In a possible implementation, the first measured voltage is calculated according to the first output voltage and the second output voltage, including:

[0010] The first output voltage and the second output voltage are both filtered into a frequency band of the first measured voltage to form a measured frequency band voltage, and the first output voltage and the second output voltage are both filtered into a frequency band of a reference voltage to form a reference frequency band voltage;

[0011] A zero point voltage is calculated according to the reference frequency band voltage corresponding to the first output voltage and the second output voltage, and the first measured voltage is calculated according to the measured frequency band voltage, the reference frequency band voltage and the zero point voltage.

[0012] In a possible implementation, the first output voltage is represented by the following formula:

[0013] ;

[0014] The second output voltage is represented by the following formula:

[0015] ;

[0016] In the formula, V OUT is the first output voltage, K is the total gain of the conditioning circuit, ω in is the angular frequency of the first measured voltage, V in+ is the first measured voltage, C1 is the coupling capacitance value between the sensing layer copper tube of the L signal line and the L signal line, V in- is the second measured voltage, C2 is the coupling capacitance value between the sensing layer copper tube of the N signal line and the L signal line, ω R is the angular frequency of the reference voltage of the first conditioning circuit, V R is the reference voltage of the first conditioning circuit, C in is the equivalent distributed capacitance of a single transmission line and the sensing layer copper tube to ground, V' OUT is the second output voltage, ω'R angular frequency of the reference voltage of the second conditioning circuit, V' R reference voltage of the second conditioning circuit.

[0017] In a possible implementation, the generation of the measured band voltage and the reference band voltage comprises:

[0018] the measured band voltage and the reference band voltage of the first output voltage are generated according to the following formula:

[0019] ;

[0020] ;

[0021] ;

[0022] wherein V Oin measured band voltage of the first output voltage, V OR reference band voltage of the first output voltage;

[0023] the measured band voltage and the reference band voltage of the second output voltage are generated according to the following formula:

[0024] ;

[0025] ;

[0026] ;

[0027] wherein V' Oin measured band voltage of the second output voltage, V' OR reference band voltage of the second output voltage.

[0028] In a possible implementation, the calculation of the zero point voltage comprises:

[0029] the zero point voltage is calculated according to the following formula:

[0030] ;

[0031] wherein V zero zero point voltage.

[0032] In a possible implementation, the calculation of the first measured voltage comprises:

[0033] the first measured voltage V in+ is calculated according to the following formula:

[0034] ;

[0035] wherein K2 is a gain coefficient.

[0036] In a possible implementation, the first conditioning circuit and the second conditioning circuit are conditioning circuits of the same structure and the same device, and the generation of the first output voltage and the second output voltage comprises:

[0037] The first measured voltage is operated through two cascaded operational amplifiers to generate a first operation voltage, and the second measured voltage is operated through two cascaded operational amplifiers to generate a second operation voltage; the non-inverting input terminal of the first-stage operational amplifier is connected to a reference voltage, the inverting input terminal of the second-stage operational amplifier is connected to the first measured voltage, and the inverting input terminal is connected to the output terminal of the first-stage operational amplifier through a voltage dividing resistor; the non-inverting input terminal of the second-stage operational amplifier is connected to the output terminal of the first-stage operational amplifier, the inverting input terminal of the second-stage operational amplifier is connected to the divided reference voltage, and the inverting input terminal is connected to the output terminal of the second-stage operational amplifier through a voltage dividing resistor;

[0038] The first operation voltage is connected to the non-inverting input terminal of the terminal operational amplifier, and the second operation voltage is connected to the inverting input terminal of the terminal operational amplifier; the inverting input terminal of the terminal operational amplifier is connected to the output terminal of the terminal operational amplifier through a resistor;

[0039] The voltage output by the output terminal of the terminal operational amplifier is taken as the first output voltage or the second output voltage.

[0040] In a second aspect, the application further provides a non-contact track frequency shift signal online monitoring system, comprising:

[0041] A mounting unit configured to mount the sensing layer copper pipe on the L signal line and the N signal line;

[0042] A receiving unit configured to receive the voltage of the sensing layer copper pipe of the L signal line as a first measured voltage, and receive the voltage of the sensing layer copper pipe of the N signal line as a second measured voltage;

[0043] A conditioning unit configured to input the first measured voltage and the second measured voltage through a first transmission line into a first conditioning circuit to receive a first output voltage output by the first conditioning circuit, and input the first measured voltage and the second measured voltage through a parallel transmission line formed by parallel connection of a second transmission line and a third transmission line into a second conditioning circuit to receive a second output voltage output by the second conditioning circuit; the first conditioning circuit and the second conditioning circuit are of the same structure and the same device; the first transmission line, the second transmission line and the third transmission line are completely the same in layout;

[0044] A calculation unit configured to calculate the first measured voltage according to the first output voltage and the second output voltage.

[0045] In a possible implementation, the computing unit is further configured to:

[0046] filtering the first output voltage and the second output voltage into a frequency band of the first measured voltage to form a measured frequency band voltage, and filtering the first output voltage and the second output voltage into a frequency band of the reference voltage to form a reference frequency band voltage;

[0047] calculating a zero point voltage according to the reference frequency band voltage corresponding to the first output voltage and the second output voltage, and calculating the first measured voltage according to the measured frequency band voltage, the reference frequency band voltage, and the zero point voltage.

[0048] In a possible implementation, the first conditioning circuit and the second conditioning circuit are conditioning circuits of the same structure and the same device, and the conditioning unit is configured to:

[0049] generating a first operation voltage by operating the first measured voltage through two cascaded operational amplifiers, and generating a second operation voltage by operating the second measured voltage through the two cascaded operational amplifiers; the non-inverting input terminal of the first-stage operational amplifier is connected to the reference voltage, the inverting input terminal of the second-stage operational amplifier is connected to the first measured voltage, and the inverting input terminal is connected to the output terminal of the first-stage operational amplifier through a voltage dividing resistor; the non-inverting input terminal of the second-stage operational amplifier is connected to the output terminal of the first-stage operational amplifier, the inverting input terminal of the second-stage operational amplifier is connected to the voltage-divided reference voltage, and the inverting input terminal is connected to the output terminal of the second-stage operational amplifier through a voltage dividing resistor;

[0050] connecting the first operation voltage to the non-inverting input terminal of a terminal operational amplifier, and connecting the second operation voltage to the inverting input terminal of the terminal operational amplifier; the inverting input terminal of the terminal operational amplifier is connected to the output terminal of the terminal operational amplifier through a resistor;

[0051] outputting the voltage at the output terminal of the terminal operational amplifier as the first output voltage or the second output voltage.

[0052] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0053] The non-contact track frequency shift signal online monitoring method and system reduce the influence of the change of the related capacitance value caused by the environmental conditions on the monitoring result through the double-path simultaneous monitoring mode, thereby effectively improving the monitoring precision, and further providing a solid foundation for the back-end processing of the non-contact frequency shift signal. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0055] Figure 1 A schematic diagram of the method steps of the embodiments of the present application is shown in the following table:

[0056] Figure 2 A circuit schematic diagram of the debugging circuit of the embodiments of the present application is shown in the following table: DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will combine the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. It should be understood that the accompanying drawings in the present application only serve the purpose of illustration and description, and do not serve to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowcharts in the present application show the operations implemented according to some embodiments of the embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts under the guidance of the content of the present application.

[0058] In addition, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0059] Please refer to Figure 1 A flowchart of a non-contact track frequency shift signal online monitoring method provided by the embodiments of the present application is shown in the following table, and further, the non-contact track frequency shift signal online monitoring method can specifically include the contents described in the following steps S1-S4.

[0060] S1: The sensing layer copper pipe is sleeved on the L signal line and the N signal line;

[0061] S2: The voltage of the sensing layer copper pipe of the L signal line is received as a first measured voltage, and the voltage of the sensing layer copper pipe of the N signal line is received as a second measured voltage;

[0062] S3: input the first measured voltage and the second measured voltage through a first transmission line to a first conditioning circuit, receive a first output voltage output by the first conditioning circuit, and input the first measured voltage and the second measured voltage through a second transmission line and a third transmission line in parallel to form a parallel transmission line to a second conditioning circuit, receive a second output voltage output by the second conditioning circuit; the structure and device of the first conditioning circuit and the second conditioning circuit are strictly the same; the first transmission line, the second transmission line, and the third transmission line are completely the same in layout;

[0063] S4: calculate the first measured voltage according to the first output voltage and the second output voltage.

[0064] When the embodiments of the application are implemented, the non-contact signal acquisition on the L signal line and the N signal line is implemented through the sensing layer copper pipe. It should be understood that a corresponding shielding layer is also arranged outside the sensing layer copper pipe. The voltage of the corresponding signal line can be sensed through the sensing layer copper pipe, and the first measured voltage and the second measured voltage are formed. At this time, the detection of the first output voltage and the second output voltage is implemented through two conditioning circuits, wherein the structure and device of the two conditioning circuits need to be strictly the same; at the same time, the first conditioning circuit needs to receive the first measured voltage and the second measured voltage through the first transmission line, and the first conditioning circuit needs to receive the first measured voltage and the second measured voltage through the parallel transmission line.

[0065] In the embodiments of the application, please refer to Figure 2 , which shows an implementation of the conditioning circuit. In the figure, C1 represents the coupling capacitance between the L signal line and the corresponding sensing layer copper pipe, C2 represents the coupling capacitance between the N signal line and the corresponding sensing layer copper pipe, C in1 represents the ground equivalent distributed capacitance of the transmission line and the sensing layer copper pipe of the L signal line, and C in2 represents the ground equivalent distributed capacitance of the transmission line and the sensing layer copper pipe of the N signal line. As can be seen from the figure, the equivalent distributed capacitance and the coupling capacitance will both affect the measurement result of the signal. At the same time, C1 and C2 are affected by the material of the signal line insulation layer, the through position and other factors, and are generally about 3-5 pf, and C1 and C2 will also change with the aging of the insulation layer and the change of temperature and humidity; while C in1 and C in2 are determined by the length and placement position of the printed board trace and the probe connection line. Once the position of the probe and the printed board is fixed, the capacitance should be constant, but the ground equivalent distributed capacitance will also float with the change of temperature and humidity, which will cause the zero voltage of the sensor to deviate, affecting the detection precision.

[0066] In the embodiment of the present application, two conditioning circuits with the same structure and device are used to receive the first measured voltage and the second measured voltage and perform corresponding signal processing; wherein, since the parallel transmission line is equivalent to two identical first transmission lines in parallel, the equivalent distributed capacitance to ground is also equivalent to twice the equivalent distributed capacitance to ground of the two first transmission lines, at this time, the final processing result will exist difference, through the difference, the zero voltage offset of the sensor itself can be analyzed, and then the accurate first measured voltage is calculated. It should be understood that the layout of the first transmission line, the second transmission line and the third transmission line is completely the same, which means that the length and environmental conditions of the three transmission lines need to be strictly the same, which can be realized by a three-core cable.

[0067] In a possible implementation, calculating the first measured voltage according to the first output voltage and the second output voltage comprises:

[0068] Filtering the first output voltage and the second output voltage into a frequency band of the first measured voltage to form a measured frequency band voltage, and filtering the first output voltage and the second output voltage into a frequency band of a reference voltage to form a reference frequency band voltage;

[0069] Calculating a zero voltage according to the reference frequency band voltage corresponding to the first output voltage and the second output voltage, and calculating the first measured voltage according to the measured frequency band voltage, the reference frequency band voltage and the zero voltage.

[0070] When the embodiment of the present application is implemented, the frequencies of the reference voltage and the measured voltage are different, so the components of the measured frequency band voltage and the reference frequency band voltage in the output voltage can be analyzed by the filter; wherein, the components of the measured frequency band voltage output by the two conditioning circuits should be the same, while the reference frequency band voltage is different due to the different reference voltages, and the corresponding calculation results will be different; at the same time, the reference frequency band voltage is related to the coupling capacitance and the equivalent distributed capacitance to ground, so the influence of the coupling capacitance and the equivalent distributed capacitance to ground, i.e. the zero voltage, can be calculated through the two, and then the first measured voltage is calculated.

[0071] In a possible implementation, the first output voltage is represented by the following formula:

[0072] ;

[0073] The second output voltage is represented by the following formula:

[0074] ;

[0075] In the formula, V OUT is the first output voltage, K is the total gain of the conditioning circuit, ω in is the angular frequency of the first measured voltage, and Vin+ is the first measured voltage, C1 is the coupling capacitance value between the sensing layer copper tube of the L signal line and the L signal line, V in- is the second measured voltage, C2 is the coupling capacitance value between the sensing layer copper tube of the N signal line and the L signal line, ω R is the angular frequency of the reference voltage of the first conditioning circuit, V R is the reference voltage of the first conditioning circuit, C in is the equivalent distributed capacitance of a single transmission line and the sensing layer copper tube to ground, V OUT is the second output voltage, ω R is the angular frequency of the reference voltage of the second conditioning circuit, V R is the reference voltage of the second conditioning circuit.

[0076] When the embodiments of the present application are implemented, since the structures and devices of the first conditioning circuit and the second conditioning circuit are strictly the same, the corresponding total gain of the conditioning circuits is the same, that is, K described above; at the same time, since the signal sources are the same, the corresponding coupling capacitances are also the same, and since the parallel transmission lines are equivalent to two identical first transmission lines in parallel, the corresponding equivalent distributed capacitance of the second conditioning circuit to ground is equivalent to twice C in It should be understood that the reference voltage and the angular frequency of the first conditioning circuit can be completely the same as the reference voltage and the angular frequency of the second conditioning circuit.

[0077] In a possible implementation, the generation of the measured frequency band voltage and the reference frequency band voltage includes:

[0078] The measured frequency band voltage and the reference frequency band voltage of the first output voltage are generated according to the following formula:

[0079] ;

[0080] ;

[0081] ;

[0082] In the formula, V Oin is the measured frequency band voltage of the first output voltage, V OR is the reference frequency band voltage of the first output voltage;

[0083] The measured frequency band voltage and the reference frequency band voltage of the second output voltage are generated according to the following formula:

[0084] ;

[0085] ;

[0086] ;

[0087] wherein V Oin is the measured frequency band voltage of the second output voltage, V OR is the reference frequency band voltage of the second output voltage.

[0088] In the embodiment of the present application, generally speaking, the second measured voltage V in- is 0, so the expression in the above embodiment can be simplified to the form in the present embodiment, and it can be seen that the measured frequency band voltage of the second output voltage and the measured frequency band voltage of the first output voltage are also completely the same, but due to the difference in the equivalent ground capacitance, the reference frequency band voltage of the second output voltage and the reference frequency band voltage of the first output voltage will be different, and based on this difference, the corresponding equivalent ground capacitance of a single transmission line can be further calculated.

[0089] In a possible implementation, the calculation of the zero voltage includes:

[0090] The zero voltage is calculated according to the following formula:

[0091] ;

[0092] wherein V zero is the zero voltage.

[0093] In the embodiment of the present application, it can be seen from the above formula that the zero voltage is related to the equivalent ground capacitance and is independent of the coupling capacitance, so the equivalent ground capacitance of a single transmission line can be calculated by the simultaneous calculation of the above formula, and then the zero voltage can be calculated; it should be understood that the zero voltage corresponds to the zero voltage of the first conditioning circuit.

[0094] In a possible implementation, the calculation of the first measured voltage includes:

[0095] The first measured voltage V in+ is calculated according to the following formula:

[0096] ;

[0097] wherein K2 is a gain coefficient.

[0098] In the embodiment of the present application, the first measured voltage can be calculated based on the output of the first conditioning circuit by the above formula.

[0099] In a possible implementation, the first conditioning circuit and the second conditioning circuit are conditioning circuits of the same structure and the same device, and the generation of the first output voltage and the second output voltage includes:

[0100] The first measured voltage is operated through two cascaded operational amplifiers to generate a first operation voltage, and the second measured voltage is operated through two cascaded operational amplifiers to generate a second operation voltage; the non-inverting input terminal of the first-stage operational amplifier is connected to a reference voltage, the inverting input terminal of the second-stage operational amplifier is connected to the first measured voltage, and the inverting input terminal is connected to the output terminal of the first-stage operational amplifier through a voltage dividing resistor; the non-inverting input terminal of the second-stage operational amplifier is connected to the output terminal of the first-stage operational amplifier, the inverting input terminal of the second-stage operational amplifier is connected to a divided reference voltage, and the inverting input terminal is connected to the output terminal of the second-stage operational amplifier through a voltage dividing resistor;

[0101] The first operation voltage is connected to the non-inverting input terminal of the terminal operational amplifier, and the second operation voltage is connected to the inverting input terminal of the terminal operational amplifier; the inverting input terminal of the terminal operational amplifier is connected to the output terminal of the terminal operational amplifier through a resistor;

[0102] The voltage output by the output terminal of the terminal operational amplifier is used as the first output voltage or the second output voltage.

[0103] When the embodiment of the application is implemented, the floating ground problem caused by long-distance signal transmission can be solved through the differential input mode.

[0104] Based on the same inventive concept, the application further provides a non-contact track frequency shift signal online monitoring system, comprising:

[0105] The installation unit is configured to install the sensing layer copper pipe on the L signal line and the N signal line;

[0106] The receiving unit is configured to receive the voltage of the sensing layer copper pipe of the L signal line as the first measured voltage, and receive the voltage of the sensing layer copper pipe of the N signal line as the second measured voltage;

[0107] The conditioning unit is configured to input the first measured voltage and the second measured voltage through a first transmission line into a first conditioning circuit, receive a first output voltage output by the first conditioning circuit, and input the first measured voltage and the second measured voltage through a parallel transmission line formed by parallel connection of a second transmission line and a third transmission line into a second conditioning circuit, and receive a second output voltage output by the second conditioning circuit; the structure and device of the first conditioning circuit and the second conditioning circuit are strictly the same; the first transmission line, the second transmission line and the third transmission line are completely the same in layout;

[0108] The calculation unit is configured to calculate the first measured voltage according to the first output voltage and the second output voltage.

[0109] In a possible implementation manner, the calculation unit is further configured to:

[0110] filtering the first output voltage and the second output voltage to a frequency band of the first measured voltage to form a measured frequency band voltage, and filtering the first output voltage and the second output voltage to a frequency band of the reference voltage to form a reference frequency band voltage;

[0111] calculating a zero point voltage according to the reference frequency band voltage corresponding to the first output voltage and the second output voltage, and calculating the first measured voltage according to the measured frequency band voltage, the reference frequency band voltage and the zero point voltage.

[0112] In a possible implementation, the first conditioning circuit and the second conditioning circuit are conditioning circuits of the same structure and the same device, and the conditioning unit is configured to:

[0113] generating a first operation voltage by operating the first measured voltage through two cascaded operation amplifiers, and generating a second operation voltage by operating the second measured voltage through the two cascaded operation amplifiers; the non-inverting input terminal of the first-stage operation amplifier is connected to the reference voltage, the inverting input terminal of the second-stage operation amplifier is connected to the first measured voltage, and the inverting input terminal is connected to the output terminal of the first-stage operation amplifier through a voltage dividing resistor; the non-inverting input terminal of the second-stage operation amplifier is connected to the output terminal of the first-stage operation amplifier, the inverting input terminal of the second-stage operation amplifier is connected to the voltage-divided reference voltage, and the inverting input terminal is connected to the output terminal of the second-stage operation amplifier through a voltage dividing resistor;

[0114] connecting the first operation voltage to the non-inverting input terminal of a terminal operation amplifier, and connecting the second operation voltage to the inverting input terminal of the terminal operation amplifier; the inverting input terminal of the terminal operation amplifier is connected to the output terminal of the terminal operation amplifier through a resistor;

[0115] outputting the voltage at the output terminal of the terminal operation amplifier as the first output voltage or the second output voltage.

[0116] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in a general manner. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0117] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other manners. For example, the apparatus embodiments described above are merely illustrative, for example, the division of the units is merely a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can also be electrical, mechanical or other form of connection.

[0118] The units described as separate components can or can not be physically separated, and it is obvious to those skilled in the art that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0119] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or software functional unit.

[0120] The integrated unit, if realized in the form of software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a grid device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0121] The above detailed description of the specific embodiments of the present application has been given to understand the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A non-contact track frequency-shift signal online monitoring method, characterized in that, The method comprises the following steps: a sensing layer copper pipe is sleeved on an L signal line and an N signal line; a voltage of the sensing layer copper pipe of the L signal line is received as a first measured voltage, and a voltage of the sensing layer copper pipe of the N signal line is received as a second measured voltage; the first measured voltage and the second measured voltage are input into a first conditioning circuit through a first transmission line, a first output voltage output by the first conditioning circuit is received, the first measured voltage and the second measured voltage are input into a second conditioning circuit through a parallel transmission line formed by the second transmission line and the third transmission line in parallel, and a second output voltage output by the second conditioning circuit is received; the first conditioning circuit and the second conditioning circuit are strictly the same in structure and device; the first transmission line, the second transmission line and the third transmission line are completely the same in layout; the first measured voltage is calculated according to the first output voltage and the second output voltage; the calculation of the first measured voltage comprises the following steps: The first measured voltage V is calculated according to the following formula in+ : ； wherein K2 is a gain coefficient, V zero is a zero voltage, V Oin is a measured frequency band voltage of the first output voltage, V OR is a reference frequency band voltage of the first output voltage, K is a total gain of the conditioning circuit, ω in is an angular frequency of the first measured voltage, V in+ is the first measured voltage, C1 is a coupling capacitance value between an inductive layer copper tube of the L signal line and the L signal line, ω R is an angular frequency of the reference voltage of the first conditioning circuit, V R is the reference voltage of the first conditioning circuit.

2. The non-contact track frequency-shift signal online monitoring method according to claim 1, characterized in that, the calculation of the first measured voltage according to the first output voltage and the second output voltage comprises the following steps: the first output voltage and the second output voltage are both filtered into a frequency band of the first measured voltage to form a measured frequency band voltage, and the first output voltage and the second output voltage are both filtered into a frequency band of a reference voltage to form a reference frequency band voltage; a zero point voltage is calculated according to the reference frequency band voltage corresponding to the first output voltage and the second output voltage, and the first measured voltage is calculated according to the measured frequency band voltage, the reference frequency band voltage and the zero point voltage.

3. The non-contact track frequency-shift signal online monitoring method according to claim 2, characterized in that, the first output voltage is represented by the following formula: ； the second output voltage is represented by the following formula: ； In the formula, V OUT is the first output voltage, V in- is the second measured voltage, C2 is the coupling capacitance value between the sensing layer copper tube of the N signal line and the L signal line, in is the equivalent distributed capacitance of a single transmission line and the sensing layer copper tube to ground, V' OUT is the second output voltage, ω' R is the angular frequency of the reference voltage of the second conditioning circuit, V' R is the reference voltage of the second conditioning circuit.

4. The non-contact track frequency-shift signal online monitoring method according to claim 3, characterized in that, the generation of the measured frequency band voltage and the reference frequency band voltage comprises the following steps: the measured frequency band voltage and the reference frequency band voltage of the first output voltage are generated according to the following formula: ； ； ； the measured frequency band voltage and the reference frequency band voltage of the second output voltage are generated according to the following formula: ； ； ； where V' is the measured frequency band voltage of the second output voltage Oin V' is the reference frequency band voltage of the second output voltage OR V' is the reference frequency band voltage of the second output voltage 5. The non-contact track frequency-shift signal online monitoring method according to claim 4, characterized in that, the calculation of the zero point voltage comprises the following steps: the zero point voltage is calculated according to the following formula: 。 6. The non-contact track frequency-shift signal online monitoring method according to claim 1, characterized in that, the first conditioning circuit and the second conditioning circuit are conditioning circuits with the same structure and the same device, and the generation of the first output voltage and the second output voltage comprises the following steps: the first measured voltage is operated through two cascaded operational amplifiers to generate a first operation voltage, and the second measured voltage is operated through two cascaded operational amplifiers to generate a second operation voltage; a non-inverting input end of a first-stage operational amplifier is connected to a reference voltage, an inverting input end of a second-stage operational amplifier is connected to the first measured voltage, and the inverting input end is connected to an output end of the first-stage operational amplifier through a voltage dividing resistor; a non-inverting input end of the second-stage operational amplifier is connected to the output end of the first-stage operational amplifier, an inverting input end of the second-stage operational amplifier is connected to the reference voltage after voltage division, and the inverting input end is connected to an output end of the second-stage operational amplifier through a voltage dividing resistor; the first operation voltage is connected to a non-inverting input end of a terminal operational amplifier, and the second operation voltage is connected to an inverting input end of the terminal operational amplifier; the inverting input end of the terminal operational amplifier is connected to the output end of the terminal operational amplifier through a resistor; a voltage output by the output end of the terminal operational amplifier is taken as the first output voltage or the second output voltage.

7. A non-contact track frequency-shift signal on-line monitoring system using the method of any one of claims 1 to 6, characterized in that, The method comprises the following steps: a mounting unit configured to mount the sensing layer copper pipe on the L signal line and the N signal line; a receiving unit configured to receive the voltage of the sensing layer copper pipe of the L signal line as a first measured voltage and receive the voltage of the sensing layer copper pipe of the N signal line as a second measured voltage; a conditioning unit configured to input the first measured voltage and the second measured voltage through a first transmission line into a first conditioning circuit, receive a first output voltage output by the first conditioning circuit, and input the first measured voltage and the second measured voltage through a parallel transmission line formed by connecting the second transmission line and the third transmission line in parallel into a second conditioning circuit, and receive a second output voltage output by the second conditioning circuit; the structure and device of the first conditioning circuit and the second conditioning circuit are strictly the same; the layout of the first transmission line, the second transmission line and the third transmission line is completely the same; a calculation unit configured to calculate the first measured voltage according to the first output voltage and the second output voltage.

8. A non-contact track frequency-shift signal online monitoring system according to claim 7, characterized in that, The calculation unit is further configured to: filter the first output voltage and the second output voltage into a frequency band of the first measured voltage to form a measured frequency band voltage, and filter the first output voltage and the second output voltage into a frequency band of a reference voltage to form a reference frequency band voltage; calculate a zero point voltage according to the reference frequency band voltage corresponding to the first output voltage and the second output voltage, and calculate the first measured voltage according to the measured frequency band voltage, the reference frequency band voltage and the zero point voltage.

9. The non-contact track frequency-shift signal online monitoring system according to claim 7, wherein, The first conditioning circuit and the second conditioning circuit are conditioning circuits with the same structure and the same device, and the conditioning unit is configured to: generate a first operation voltage by operating the first measured voltage through two cascaded operational amplifiers, and generate a second operation voltage by operating the second measured voltage through two cascaded operational amplifiers; the non-inverting input terminal of the first-stage operational amplifier is connected to a reference voltage, the inverting input terminal of the second-stage operational amplifier is connected to the first measured voltage, and the inverting input terminal is connected to the output terminal of the first-stage operational amplifier through a voltage dividing resistor; the non-inverting input terminal of the second-stage operational amplifier is connected to the output terminal of the first-stage operational amplifier, the inverting input terminal of the second-stage operational amplifier is connected to the reference voltage after voltage division, and the inverting input terminal is connected to the output terminal of the second-stage operational amplifier through a voltage dividing resistor; connect the first operation voltage to the non-inverting input terminal of the terminal operational amplifier, and connect the second operation voltage to the inverting input terminal of the terminal operational amplifier; the inverting input terminal of the terminal operational amplifier is connected to the output terminal of the terminal operational amplifier through a resistor; output the voltage of the output terminal of the terminal operational amplifier as the first output voltage or the second output voltage.

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