JP2019009676A - State diagnostic device and state diagnostic method of leakage coaxial cable - Google Patents

Abstract

To allow for easy and highly accurate diagnosis of the state of an LCX laid along an orbit.SOLUTION: A state diagnostic device includes a vertical polarization antenna 21 configured to receive electromagnetic wave of vertical polarization radiated from an LCX 100, a horizontal polarization antenna 22 configured to receive electromagnetic wave of horizontal polarization radiated from the LCX 100, a ratio calculation section, and a diagnostic information generation section. The ratio calculation section calculates the field strength ratio, i.e., the ratio of vertical polarization strength and horizontal polarization strength. The diagnostic information generation section generates diagnostic information indicating the state of the LCX 100, based on the field strength ratio calculated by the ratio calculation section.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a technique for diagnosing the state of a leaky coaxial cable laid along a track.

  As a communication system for wireless communication performed between a railway vehicle traveling on a track and the ground side, an LCX communication system using a leaky coaxial cable (hereinafter abbreviated as “LCX”) is known ( For example, see Patent Document 1.)

  The LCX used in the LCX communication method is generally configured and laid so as to radiate a radio wave having a vertically polarized wave as a main polarization component. Therefore, on the vehicle side, an antenna (hereinafter referred to as a “vertically polarized antenna”) capable of satisfactorily transmitting and receiving vertically polarized radio waves is mounted.

JP 2009-272748 A

LCX laid along the track may deteriorate due to aging and various other factors. For this reason, diagnosis of the state of the LCX is usually performed at an appropriate timing.
As a method for diagnosing the state of LCX, for example, a method of measuring the reception intensity of vertically polarized radio waves radiated from LCX and diagnosing the presence or absence of abnormality based on the measurement result is known.

  However, the reception intensity of radio waves radiated from LCX varies depending on the distance from a signal source that supplies power to LCX, the installation environment of LCX, and the like. Even at the same measurement position, variations may occur depending on the measurement timing (for example, measurement date). Therefore, it is necessary to diagnose the presence or absence of an abnormality in consideration of these variations, and it is difficult to diagnose with high accuracy.

  One aspect of the present disclosure aims to enable easy and high-precision diagnosis of the state of the LCX laid along the track.

  One aspect of the present disclosure is a state diagnosis device that diagnoses the state of a leaky coaxial cable. The leaky coaxial cable is laid along the track and radiates radio waves based on power supplied from a signal source. The state diagnosis apparatus includes a vertical polarization antenna, a horizontal polarization antenna, a ratio calculation unit, and a diagnosis information generation unit.

  The vertically polarized antenna is configured to receive vertically polarized radio waves radiated from a leaky coaxial cable. The horizontally polarized antenna is configured to receive horizontally polarized radio waves radiated from a leaky coaxial cable. Here, the electric field intensity of the radio wave received by the vertical polarization antenna is defined as vertical polarization intensity, and the electric field intensity of the radio wave received by the horizontal polarization antenna is defined as horizontal polarization intensity. The ratio calculation unit is configured to calculate an electric field strength ratio that is a ratio between the vertical polarization strength and the horizontal polarization strength. The diagnostic information generation unit is configured to generate diagnostic information indicating the state of the leaky coaxial cable based on the electric field intensity ratio calculated by the ratio calculation unit.

  According to such a configuration, the ratio between the vertical polarization intensity and the horizontal polarization intensity, that is, the electric field intensity ratio is calculated. Then, diagnostic information based on the calculated electric field strength ratio is generated. Therefore, by using the generated diagnostic information, it is possible to diagnose the state of the leaky coaxial cable based on the electric field strength ratio of the radio wave radiated from the leaky coaxial cable. It becomes possible to diagnose with.

  The diagnosis information generation unit may be configured to determine whether or not the electric field intensity ratio calculated by the ratio calculation unit is a normal value, and to output information indicating the determination result as diagnosis information. According to such a configuration, it is possible to easily know whether or not the leaky coaxial cable is normal based on the diagnostic information generated by the diagnostic information generation unit.

  The ratio calculation unit may be configured to calculate an electric field intensity ratio at each diagnosis position for each of a plurality of different diagnosis positions along the laying direction of the leaky coaxial cable. In that case, the diagnostic information generation unit calculates a deviation value of each electric field strength ratio using each electric field strength ratio at a plurality of diagnostic positions as a population, and generates diagnostic information based on each calculated deviation value. It may be configured.

  According to such a configuration, the measurement condition changes every time measurement is performed, and the absolute value of the calculated electric field strength ratio is different for each measurement even though the state of the leaky coaxial cable is not changed. However, by converting to a deviation value, the influence of the difference in absolute value can be suppressed. That is, highly accurate diagnostic information can be obtained for each measurement regardless of measurement conditions.

  Another aspect of the present invention is a state diagnosis method for diagnosing the state of a leaky coaxial cable. In this state diagnosis method, a vertically polarized radio wave radiated from a leaky coaxial cable, a horizontally polarized radio wave radiated from a leaky coaxial cable, and a received vertical polarized radio wave Calculate the electric field strength ratio, which is the ratio of the vertical polarization strength to the horizontal polarization strength, using the electric field strength as the vertical polarization strength and the received electric field strength of the horizontally polarized radio wave as the horizontal polarization strength. Generating diagnostic information indicating a state of the leaky coaxial cable based on the intensity ratio.

  According to such a state diagnosis method, the state of the leaky coaxial cable can be diagnosed based on the electric field strength ratio of the radio wave radiated from the leaky coaxial cable, as in the above-described state diagnosis device. It becomes possible to diagnose the state easily and with high accuracy.

It is explanatory drawing which shows schematic structure of the communication system of embodiment. It is explanatory drawing which shows the structure of LCX. It is explanatory drawing which shows the arrangement | positioning state of a vertical polarization antenna and a horizontal polarization antenna. It is explanatory drawing which shows an example of the measurement result of horizontal polarization intensity. It is a flowchart of a state diagnostic process. It is explanatory drawing which shows an example of the measurement result of vertical polarization intensity and horizontal polarization intensity. It is explanatory drawing which shows an example of the calculation result of an electric field strength difference. It is explanatory drawing which shows the example which converted the electric field strength difference of FIG. 7 into the deviation value.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. Embodiment]
(1-1) Configuration of Communication System The communication system according to the present embodiment shown in FIG. 1 is configured so that wireless communication can be performed between various vehicles traveling on the track 200 and the ground system 110 using the LCX communication method. Has been. FIG. 1 shows a state in which the measurement vehicle 10 is traveling on the track 200.

  The track 200 includes, for example, two rails, and is configured so that the vehicle can travel on the rails. That is, the track 200 of the present embodiment is configured so that a rail vehicle can travel. The measurement vehicle 10 shown in FIG. 1 is not a business vehicle used in business operation, but a vehicle equipped with various devices for performing various measurements.

  Note that the configuration of the track 200 having two rails is merely an example, and the specific configuration of the track 200 and the types of vehicles that can travel on the track 200 are particularly limited. is not. For example, the track 200 may be a track for a magnetically levitated railway vehicle in which electromagnetic coils are laid on the ground or side walls. For example, the track 200 may be a track provided with a guide rail in a so-called new transportation system.

  As shown in FIG. 1, the communication system of the present embodiment includes an LCX 100 as equipment for transmitting and receiving radio waves on the ground side. The LCX 100 extends along the track 200 (that is, along the z-axis direction in the drawing).

  The specific configuration of the LCX 100 is as shown in FIG. As shown in FIG. 2, the LCX 100 includes an inner conductor 101, an insulator 102, an outer conductor 103, and a sheath 104. A plurality of slots 106 a and 106 b are formed in the outer conductor 103 at regular intervals along the axial direction of the LCX 100 (that is, the z-axis direction). Specifically, the first slots 106a and the second slots 106b are alternately formed along the axial direction. The first slot 106a and the second slot 106b in the same LCX 100 have the same size and shape, but different inclinations. That is, the LCX 100 of this embodiment is a so-called zigzag slot type LCX.

  When transmission power is supplied from the signal source 111 to the LCX 100, radio waves are emitted from the slots 106a and 106b of the LCX 100. Radio waves radiated from the slots 106a and 106b include vertically polarized waves and horizontally polarized waves. That is, the radio wave radiated from the LCX 100 is a composite wave of vertical polarization components and horizontal polarization components.

  Note that the vertical polarization is a polarization whose plane of polarization (that is, the direction of the electric field) is perpendicular to the ground. More specifically, in FIG. 1 and FIG. 2, the polarization plane is parallel to the xy plane. It is. On the other hand, the horizontal polarization is a polarization whose polarization plane is parallel to the ground, and more specifically, in FIG. 1 and FIG. 2, the polarization plane is a polarization parallel to the yz plane.

  When the LCX 100 is normal, the electric field intensity Eφ of the vertical polarization (hereinafter referred to as “vertical polarization intensity Eφ”) is referred to as the electric field intensity Ez of the horizontal polarization (hereinafter referred to as “horizontal polarization intensity Ez”). Bigger than). That is, the main polarization component of the radio wave radiated from the LCX 100 is usually vertical polarization. For this reason, a vehicle that performs wireless communication using the LCX system usually has a vertically polarized antenna that can transmit and receive vertically polarized waves satisfactorily and performs wireless communication using the vertically polarized antenna. Note that, as shown in FIG. 2, the vertical polarization intensity Eφ is the intensity of the electric field component in the circumferential direction with the z axis as an axis among electric field components parallel to the XY plane.

  The LCX 100 has a signal source 111 connected to one first end side of both ends thereof, and a termination resistor connected to the second end side of both ends thereof. Therefore, the electric power input from the signal source 111 to the first end side of the LCX 100 is transmitted to the second end side, and is radiated to the outside as a radio wave in the process of transmission.

  In this embodiment, more specifically, a grading method is adopted as a method of laying LCX 100. That is, although not shown in FIG. 1, a plurality of (for example, three) LCXs 100 are actually connected in series. The plurality of LCXs 100 connected in series are collectively referred to as an LCX unit. A signal source 111 is connected to the first end of both ends of the LCX unit. That is, power is supplied from the signal source 111 to the first end of the LCX unit. A termination resistor is connected to the second end of both ends of the LCX unit. FIG. 1 illustrates the LCX 100 closest to the signal source 111 among the plurality of LCXs 100 included in the LCX unit.

  The power input to the first end of the LCX unit is transmitted from the first end to the second end. A part of the transmitted power leaks from the slots 106a and 106b, so that radio waves are radiated from the slots 106a and 106b.

  A plurality of LCX units may be connected in series, an amplifier that amplifies transmission power may be provided between adjacent LCX units, and a termination resistor may be connected to the termination side of the plurality of LCX units.

  The LCX 100 has not only a transmission function for radiating radio waves based on the power supplied from the signal source 111 but also a reception function for receiving radio waves transmitted from vehicles traveling on the track 200 and transmitting them to the ground side system 110. However, the explanation of the reception function is omitted.

  The ground side system 110 includes a signal source 111. In addition to the signal source 111, the ground-side system 110 includes various devices for performing data communication with various vehicles traveling on the track 200. When the ground system 110 transmits data to a traveling vehicle, the ground system 110 outputs a transmission signal including the data to be transmitted from the signal source 111 to the LCX 100. Thereby, the transmission signal is radiated from the LCX 100 by radio waves. In addition, a reception signal transmitted from the traveling vehicle and received by the LCX 100 is transmitted to the ground side system 110, and various processes are performed in the ground side system 110.

  As shown in FIGS. 1 and 3, at least two windows 11 and 12 are provided on the side surface of the measurement vehicle 10. Further, as shown in FIGS. 1 and 3, the measurement vehicle 10 is equipped with a vertically polarized antenna 21, a horizontally polarized antenna 22, and an LCX diagnostic device 30.

  The vertical polarization antenna 21 is arranged for receiving vertical polarization, and the horizontal polarization antenna 22 is arranged for receiving horizontal polarization. In the present embodiment, both the vertical polarization antenna 21 and the horizontal polarization antenna 22 are dipole antennas.

  The vertically polarized antenna 21 is arranged so as to face the first window 11, that is, the entire vertically polarized antenna 21 can be seen through the first window 11 from the outside of the vehicle. In addition, the vertical polarization antenna 21 is configured so that the length direction of the antenna element is parallel to the polarization plane of the vertical polarization from the LCX 100 so that the vertical polarization is satisfactorily received and reception of the horizontal polarization is suppressed. And arranged so as to be parallel to the xz plane.

  The horizontally polarized antenna 22 is disposed so as to face the second window 12, that is, the entire horizontally polarized antenna 22 can be seen through the second window 12 from the outside of the vehicle. Further, the horizontal polarization antenna 22 is configured so that the length direction of the antenna element is parallel to the polarization plane of the horizontal polarization from the LCX 100 so that the horizontal polarization is satisfactorily received and reception of the vertical polarization is suppressed. And arranged so as to be parallel to the xz plane.

  In the present embodiment, the vertically polarized antenna 21 and the horizontally polarized antenna 22 have the same height from the ground at each feeding point, and the distance between each feeding point and the LCX 100 (that is, in the y-axis direction). (Distance) is the same.

  The vertically polarized antenna 21 and the horizontally polarized antenna 22 are each connected to the LCX diagnostic apparatus 30 by a coaxial cable. The reception signals received by the vertical polarization antenna 21 and the horizontal polarization antenna 22 are respectively input to the LCX diagnostic device 30.

The LCX diagnostic device 30 is configured to detect an abnormality of the LCX 100 based on the electric field strength of the received signal received by the vertical polarization antenna 21 and the horizontal polarization antenna 22.
In addition to the reception signals from the vertical polarization antenna 21 and the horizontal polarization antenna 22, various information used for detecting an abnormality of the LCX 100 is input to the LCX diagnostic apparatus 30. For example, the measurement vehicle 10 is equipped with a position detection device that detects the position of the measurement vehicle 10 on the track 200, and position information indicating the position detected by the position detection device is input to the LCX diagnostic device 30. The In the present embodiment, as the position information, for example, a so-called kilometer starting from a specific reference position is detected.

(1-2) State Diagnosis Processing by LCX Diagnostic Device 30 When the LCX 100 is deteriorated due to aging or other various factors, the horizontal polarization intensity Ez may be larger than that at the normal time. One of the main causes of the increase in the horizontal polarization intensity Ez due to the deterioration is that the outer conductor 103 is cracked in the circumferential direction.

  When the outer conductor 103 of the LCX 100 is cracked in the circumferential direction, the vertical polarization intensity Eφ does not change from the normal time or even if it changes, the change amount is small, whereas the horizontal polarization intensity Ez is lower than the normal time. Also grows. Since the amount of increase in the horizontal polarization intensity Ez is very large with respect to the amount of change in the vertical polarization intensity Eφ, it can be considered that only the horizontal polarization intensity Ez is larger than that in the normal state when viewed relatively.

  Therefore, when the LCX 100 deteriorates and the horizontal polarization intensity Ez increases, the ratio Eφ / Ez (hereinafter referred to as “field intensity ratio”) between the electric field intensity Eφ of the vertical polarization and the horizontal polarization intensity Ez is normal. Smaller than. In the following description, “deterioration” of LCX means that an abnormality that reduces the electric field strength ratio occurs unless otherwise specified.

  Here, a supplementary explanation will be given on the unit system of electric field strength and electric field strength ratio. The electric field strength ratio Eφ / Ez is based on the premise that the vertical polarization strength Eφ and the horizontal polarization strength Ez are both expressed in units of V / m. On the other hand, when the value obtained by logarithmically converting the vertical polarization intensity Eφ is the vertical polarization intensity Eφd and the value obtained by logarithmically converting the horizontal polarization intensity Ez is the horizontal polarization intensity Ezd, the above-described electric field strength ratio is represented by the logarithm. And Eφd [dBm] and Ezd [dBm] (hereinafter referred to as “field strength difference”).

  That is, in the present embodiment, the electric field strength ratio means a ratio of the vertical polarization strength Eφ and the horizontal polarization strength Ez expressed in units of V / m, and the electric field strength difference means a unit of dBm, ie, logarithm. Is a difference between the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd. Needless to say, both the electric field strength ratio and the electric field strength difference differ only in the unit system, and the physical meanings of the numerical values indicated by these units are the same.

Therefore, either unit system may be used for evaluation, but in the following description of the present embodiment, the vertical polarization intensity and the horizontal polarization intensity are expressed in logarithmic units unless otherwise specified.
When the LCX 100 is normal, the electric field intensity difference between the radio waves radiated from the LCX 100 is at a level within a substantially constant range regardless of the position (that is, regardless of the distance from the signal source 111), for example, about 15 dB (electric field intensity ratio). For example, the value is in the range of about 30). That is, in the normal state, the vertical polarization intensity Eφ and the horizontal polarization intensity Ez are substantially proportional.

  On the other hand, when a specific part of the LCX 100 deteriorates and the horizontal polarization intensity Ezd from the part increases, the horizontal polarization intensity Ezd becomes relatively larger than the vertical polarization intensity Eφd and radiates from the part. The difference in electric field strength between the radio waves is smaller than normal.

  The LCX diagnostic device 30 detects an abnormality of the LCX 100, specifically, an abnormality of the LCX 100, by utilizing the fact that the difference in electric field strength at the deteriorated portion becomes smaller than normal when the LCX 100 deteriorates.

  In addition, as a method of detecting an abnormality of the LCX 100, a method of detecting using only the horizontal polarization intensity Ezd without using the vertical polarization intensity Eφd is conceivable. However, as illustrated in FIG. 4, even if the LCX 100 is normal, the electric field intensity of the radio wave radiated from the LCX 100 includes the distance from the signal source 111, the installation environment of the LCX 100, the measurement timing (for example, measurement date), and the like. May cause variations. For this reason, it is difficult to accurately detect the presence / absence of an abnormality in the method of detecting the presence / absence of abnormality using only the horizontal polarization intensity Ezd as an evaluation target. Therefore, in this embodiment, the presence or absence of abnormality is detected with high accuracy based on the electric field strength difference between the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd.

  The LCX diagnostic device 30 includes a control unit 31, a storage unit 32, and a display unit 33. The control unit 31 has, for example, a CPU. The storage unit 32 includes a semiconductor memory such as a ROM, RAM, NVRAM, or flash memory. That is, the LCX diagnostic device 30 of this embodiment includes a microcomputer including a CPU and a semiconductor memory. The display unit 33 displays an image indicating various information. The display unit 33 may be a liquid crystal display, for example.

  The control unit 31 implements various functions by executing a program stored in a non-transitional tangible recording medium. In the present embodiment, the storage unit 32 corresponds to a non-transitional tangible recording medium that stores a program. The storage unit 32 stores a program for state diagnosis processing of FIG. 5 to be described later for detecting an abnormality of the LCX 100. The various functions realized by the control unit 31 are not limited to being realized by executing a program, and some or all of the functions may be realized by using one or a plurality of hardware.

  Next, the state diagnosis process executed by the LCX diagnostic device 30 will be described with reference to FIG. In the present embodiment, when a predetermined execution instruction for starting the state diagnosis process is input, the control unit 31 executes the state diagnosis process shown in FIG.

  When the state diagnosis process of FIG. 5 is started, the controller 31 measures the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd for each measurement point, and records the measurement results in the storage unit 32 in S110. Further, the measurement result is displayed on the display unit 33.

  The vertical polarization intensity Eφd measured here is specifically the electric field intensity of the radio wave received by the vertical polarization antenna 21. The horizontal polarization intensity Ezd measured here is specifically the electric field intensity of the radio wave received by the horizontal polarization antenna 22.

  The measurement point may be determined as appropriate. For example, a measurement point may be determined in advance, and measurement may be performed each time the input position information matches the predetermined measurement point. Further, for example, a measurement pitch may be determined in advance, and measurement may be performed every time the traveling of the measurement vehicle 10 advances by the predetermined measurement pitch after the start of the state diagnosis process. In the present embodiment, as an example, the measurement pitch is 2 m, and Eφd and Ezd are measured every time the measurement vehicle 10 advances 2 m.

  In S110, the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd are recorded and displayed for each measurement point in association with the measurement position indicating the position of the measurement point. The measurement position to be associated may be the position indicated by the position information of the input measurement point. Further, when the position indicated by the input position information and the positions of the antennas 21 and 22 are deviated by a predetermined length in the orbit direction, the position indicated by the input position information at the time of recording the polarization intensities Eφd and Ezd May be corrected to the position of the vertically polarized antenna 21, the position of the horizontally polarized antenna 22, or a specific position near each of the antennas 21 and 22, and the corrected position may be used as the measurement position.

  In S120, the electric field intensity difference at the measurement position is calculated for each measurement point based on the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd measured in S110, and the calculation result is associated with the measurement position and stored in the storage unit. 32. The calculation result is displayed on the display unit 33.

  In S130, the presence / absence of abnormality of the LCX 100 is determined for each measurement point based on the electric field strength difference calculated in S120. For example, a threshold value of the electric field strength difference may be set, and when the electric field strength difference is equal to or larger than the threshold value, it is determined to be normal. The threshold value may be obtained experimentally or theoretically in advance and stored in the storage unit 32.

  In S140, for each measurement point, information indicating the determination result of the presence or absence of abnormality at the measurement position is output based on the determination result in S130. For example, information such as the measurement position determined to be abnormal and the electric field strengths Eφd, Ezd and the electric field strength difference at the measurement position are stored in the storage unit 32 or displayed on the display unit 33.

  In the state diagnosis process of FIG. 5, for example, only S110 is first executed over the entire travel section to be measured, and all the vertical polarization intensity Eφd and horizontal polarization intensity Ezd for each measurement point in the entire travel section are obtained. After the measurement, the processing after S120 may be executed. Alternatively, for example, every time the measurement point is reached, the processing of S110 to S140 may be executed to determine whether there is an abnormality in the LCX 100 at the measurement position corresponding to the measurement point. That is, as long as it can be finally determined whether or not there is an abnormality in the LCX 100 in all the sections to be measured, it may be determined as appropriate at which timing the processing after S120 is performed.

  Various information such as measurement results and diagnostic information stored in the storage unit 32 in S110, S120, and S140 is acquired from an information processing device different from the LCX diagnostic device 30 by wireless communication or wired communication, and the information processing is performed. It may be processed in the device.

  FIG. 6 shows an example of the measurement result displayed by the process of S110. FIG. 6 shows the result of individually measuring the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd for each measurement position. From such vertical polarization intensity Eφd and horizontal polarization intensity Ezd itself, it is difficult to determine whether the LCX 100 is abnormal.

  Next, FIG. 7 shows an example of the calculation result displayed by the process of S120. FIG. 7 shows the field strength differences for two different days. In the measurement result on the first measurement day in FIG. 7, for example, the electric field strength difference is less than 0 dB around 372.61 km. Therefore, for example, by setting the threshold value to 0 dB, it is possible to detect that an abnormality has occurred in the portion corresponding to the measurement position 372.61 km in the LCX 100 or in the vicinity thereof.

  The measurement result on the second measurement day in FIG. 7 is the measurement result after partially repairing the position near 372.61 km in the LCX 100 based on the detection result on the first measurement day. From the measurement results on the second measurement day, it can be seen that the electric field strength difference of 372.61 km has been improved by the repair.

  Here, a supplementary description will be given of a method of evaluating the measurement result based on the deviation value. In the present embodiment, the measurement system including the antennas 21 and 22 and the LCX diagnostic device 30 for detecting an abnormality of the LCX 100 is not permanently installed in the measurement vehicle 10, and the measurement vehicle 10 is provided as necessary. Carry and install. Therefore, it is not always possible to measure under the same measurement conditions every time measurement is performed, and further improvement in accuracy of the measurement result is desired in that respect.

  On the other hand, by converting the measurement result into a deviation value and evaluating with the deviation value, it is possible to suppress an influence due to variation in measurement conditions and detect an abnormality with higher accuracy. That is, for example, data on different measurement dates can be evaluated based on the same standard. Specifically, for each measurement, the measurement results at all measurement positions in the entire measurement section are used as a population, and the measurement results at each measurement position in the population are converted into deviation values.

  FIG. 8 shows the result of converting the field strength difference of each day shown in FIG. 7 into a deviation value. In FIG. 7, the overall tendency of the measurement results is the same on each measurement day, but the absolute value of the electric field strength difference varies depending on the measurement date. On the other hand, when converted to a deviation value as shown in FIG. 8, the variation in absolute value of each measurement day that occurred in FIG. 7 is canceled, and the presence or absence of abnormality is determined using the same reference value for each measurement day. Will be able to. For example, with the deviation value 30 as a reference value, it can be determined that some abnormality has occurred at a measurement position having a deviation value lower than the reference value.

  Therefore, for example, in the process of S130, the LCX diagnostic device 30 may convert the electric field strength difference into a deviation value, and determine whether there is an abnormality based on the deviation value. And in the process of S140, you may make it output the information which shows the judgment result based on the deviation value.

(1-3) Effects of Embodiment According to the embodiment described above, the following effects (1a) to (1c) are achieved.
(1a) In this embodiment, the LCX diagnostic apparatus 30 calculates the difference between the vertical polarization intensity Eφd and the horizontal polarization intensity Ezd, that is, the electric field intensity difference, for each measurement position, and stores the calculation result in the storage unit 32. The information is stored and displayed on the display unit 33.

  Therefore, the state of the leaky coaxial cable can be diagnosed based on the difference in the electric field strength of the radio wave radiated from the LCX 100, whereby the state of the LCX 100 can be diagnosed easily and with high accuracy for each measurement position. . Further, based on the electric field strength difference at each measurement position, when an abnormality occurs, it is possible to easily identify the position where the abnormality has occurred.

  (1b) In the present embodiment, the LCX diagnostic apparatus 30 determines whether the position corresponding to the measurement position in the LCX 100 is abnormal based on the electric field strength difference for each measurement position by the processing of S130 to S140 in FIG. Judge until. And the information which shows the judgment result is produced | generated, for example, memorize | stored in the memory | storage part 32 or displayed on the display part 33. FIG.

Therefore, it is possible to easily know whether the state of the LCX 100 is normal for each measurement position.
(1c) By converting the electric field strength difference into a deviation value and evaluating it, the state of the LCX 100 can be diagnosed with high accuracy regardless of the measurement conditions at the time of measurement.

  In the present embodiment, the vertical polarization antenna 21, the horizontal polarization antenna 22, and the LCX diagnostic device 30 correspond to an example of a state diagnostic device in the present disclosure. Further, the LCX diagnostic device 30 corresponds to an example of a ratio calculation unit and a diagnostic information generation unit in the present disclosure, and the measurement position corresponds to an example of a diagnostic position in the present disclosure. The information indicating the electric field strength difference calculated in S120 and the determination result output in S140 corresponds to an example of diagnostic information in the present disclosure.

[2. Other Embodiments]
As mentioned above, although embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, and can carry out various modifications.

  (2-1) The LCX diagnostic device 30 may be configured to execute a part of the state diagnostic processing shown in FIG. For example, the LCX diagnostic device 30 may execute from S110 to S120. The determination of the presence / absence of abnormality based on the electric field strength difference calculated in S120 may be performed by a device different from the LCX diagnostic device 30, or the user himself / herself may make a determination based on the electric field strength difference.

  (2-2) In the above embodiment, the evaluation of the electric field intensity and ratio of each polarization is performed by converting into logarithm, but it is not essential to evaluate in logarithm in this way. For example, instead of logarithm, the electric field intensity of each polarization may be evaluated by the value of the unit system of V / m.

  (2-3) About each antenna 21 and 22, being a dipole type antenna is an example to the last, and the specific kind of each antenna 21 and 22 may be determined suitably. The vertical polarization antenna may be at least an antenna having a relatively higher vertical polarization reception gain than a horizontal polarization reception gain. The horizontal polarization antenna may be at least an antenna having a relatively higher horizontal polarization reception gain than a vertical polarization reception gain.

  (2-4) It is not essential to make the heights of the feeding points of the antennas 21 and 22 uniform. Further, where and in what direction the antennas 21 and 22 are installed in the measurement vehicle 10 may be determined as appropriate.

  (2-5) The LCX to be diagnosed is not limited to the zigzag slot type LCX. The present disclosure can be applied to any type of LCX in which the radio wave radiated includes vertical polarization and horizontal polarization, and the electric field strength difference varies between normal and abnormal occurrences. .

  (2-6) A plurality of functions of one constituent element in the above embodiment are realized by a plurality of constituent elements, or a single function of one constituent element is realized by a plurality of constituent elements. Also good. Further, a plurality of functions possessed by a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

  DESCRIPTION OF SYMBOLS 10 ... Measurement vehicle, 11 ... 1st window, 12 ... 2nd window, 21 ... Vertical polarization antenna, 22 ... Horizontal polarization antenna, 30 ... LCX diagnostic apparatus, 31 ... Control part, 32 ... Memory | storage part, 33 ... Display Part 100 ... LCX 110 ... ground side system 111 ... signal source 200 ... orbit.

Claims (4)

A state diagnosing device for diagnosing the state of a leaky coaxial cable laid along a track and radiating radio waves based on power supplied from a signal source,
A vertically polarized antenna configured to receive vertically polarized radio waves radiated from the leaky coaxial cable;
A horizontally polarized antenna configured to receive horizontally polarized radio waves radiated from the leaky coaxial cable;
The vertical polarization strength and the horizontal polarization strength, where the electric field strength of the radio wave received by the vertical polarization antenna is the vertical polarization strength, and the electric field strength of the radio wave received by the horizontal polarization antenna is the horizontal polarization strength. A ratio calculator configured to calculate a field strength ratio that is a ratio of
A diagnostic information generating unit configured to generate diagnostic information indicating a state of the leaky coaxial cable based on the electric field strength ratio calculated by the ratio calculating unit;
A state diagnosis device for leaky coaxial cable. A state diagnosis apparatus for a leaky coaxial cable according to claim 1,
The diagnostic information generation unit is configured to determine whether or not the electric field intensity ratio calculated by the ratio calculation unit is a normal value, and output information indicating the determination result as the diagnostic information. , Leaky coaxial cable condition diagnosis device. A state diagnostic apparatus for a leaky coaxial cable according to claim 1 or 2,
The ratio calculation unit is configured to calculate the electric field strength ratio at the diagnostic position for each of a plurality of different diagnostic positions along the laying direction of the leaky coaxial cable,
The diagnostic information generation unit calculates a deviation value of each electric field intensity ratio using the electric field intensity ratios at the plurality of diagnosis positions as a population, and generates the diagnostic information based on the calculated deviation values. Configured as
Leakage coaxial cable condition diagnosis device. A state diagnosis method for diagnosing the state of a leaky coaxial cable that is laid along a track and radiates radio waves based on power supplied from a signal source,
Receiving vertically polarized radio waves radiated from the leaky coaxial cable;
Receiving horizontally polarized radio waves radiated from the leaky coaxial cable;
It is a ratio of the vertical polarization strength and the horizontal polarization strength, where the electric field strength of the received radio wave of vertical polarization is vertical polarization strength, and the electric field strength of the received radio wave of horizontal polarization is horizontal polarization strength. Calculating the field strength ratio;
Generating diagnostic information indicating the state of the leaky coaxial cable based on the calculated electric field strength ratio;
A method for diagnosing a leaky coaxial cable comprising:

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