An intelligent integrated monitoring system for leaky cables

Abstract

The present invention belongs to the technical field of urban rail transit, and discloses an intelligent integrated monitoring system for leaky cables, which includes a central device and multiple in-station devices. A communication connection is provided between the central device and the multiple in-station devices by a switching device. The central device includes a monitoring server and a monitoring terminal; the in-station devices include a leaky cable monitoring host, a radio frequency optical distribution box, and a feeder connecting the leaky cable monitoring host and the radio frequency optical distribution box. The leaky cable monitoring host includes a leaky cable monitoring device and a signal source monitoring device. The radio frequency optical distribution box includes a radio frequency optical distribution box type I and a radio frequency optical distribution box type II. Among them, the leaky cable monitoring device and the radio frequency optical distribution box type I are used in pairs, and the signal source monitoring device and the radio frequency optical distribution box type II are used in pairs. The present invention can completely solve the problems of monitoring and maintenance of leaky cables in urban rail transit, effectively reduce the manpower input, and reduce the operation and maintenance costs.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail transit, and particularly to an intelligent integrated monitoring system for leaky cables. Background Art

[0002] At present, leaky cable monitoring systems have been widely and maturely applied in national railways. In the subway-related industry, small-scale fault monitoring mainly relies on the standing wave detection of the base station itself. Once a leaky cable fault occurs, it will directly affect the normal operation of the line. Subway lines have an urgent need for leaky cable monitoring. The application status of leaky cables is directly related to the propagation of radio waves along the subway line and affects the quality of vehicle-ground communication in the train control system. Once a leaky cable line fails, the attached devices connected to the leaky cable are damaged, or the field strength changes, all of which may lead to a decline in the quality of wireless signals, and then directly affect the normal operation of the train. At present, the call for leaky cable monitoring in China is getting louder and louder. Summary of the Invention

[0003] Aiming at the technical problems in the prior art, the present invention provides an intelligent integrated monitoring system for leaky cables. The leaky cable monitoring host adopts four ports, which meets the application scenario of double leaky cables in the subway, greatly reducing the hardware investment of leaky cable monitoring equipment. In addition, through certain technical means, the abnormal state of the signal wireless communication system can be sensed, and early prediction and countermeasures can be taken to reduce the impact of the failure of the entire wireless communication link on the operation, and completely solve the problems of monitoring and maintenance of leaky cables (including attached facilities on the wireless communication link) in urban rail transit.

[0004] The technical solution includes a central device and multiple in-station devices. A communication connection is provided between the central device and the multiple in-station devices by a switching device. The central device includes a monitoring server and a monitoring terminal;

[0005] The in-station device includes a leaky cable monitoring host, a radio frequency optical distribution box, and a feeder connecting the leaky cable monitoring host and the radio frequency optical distribution box. The leaky cable monitoring host includes a leaky cable monitoring device and a signal source monitoring device. The radio frequency optical distribution box includes a radio frequency optical distribution box type I and a radio frequency optical distribution box type II. Among them, the leaky cable monitoring device and the radio frequency optical distribution box type I are used in pairs, and the signal source monitoring device and the radio frequency optical distribution box type II are used in pairs. The leaky cable monitoring host provides four detection signals, which are transmitted into the leaky cable through the insertion duplexer in the radio frequency optical distribution box type I and absorbed by the insertion duplexer in the radio frequency optical distribution box type II for the monitoring of four leaky cables.

[0006] Preferably, the switching device includes a central aggregation switch and multiple in-station access switches. The central aggregation switch is connected to the central device, and the multiple in-station access switches are respectively connected to the multiple in-station devices in one-to-one correspondence.

[0007] Preferably, the leaky cable monitoring device includes a leaky cable monitoring host core module, a signal source monitoring host, and a first power module. The leaky cable monitoring host core module is connected to the signal source monitoring host, and both are connected to the first power module. A total of eight RF connectors for type-I connection with the RF optical cross-connect box are provided on the leaky cable monitoring host core module and the signal source monitoring host. The signal source monitoring host includes four signal source links, and each signal source link contains RRU A network and RRU B network signals. The A and B network signals of the two RRUs are directly connected to the leaky cable through the RF optical cross-connect box, and at the same time, four coupled signals are coupled to the signal source monitoring host. The signal source monitoring host judges the working states of passive devices and signal sources by analyzing and judging the four coupled signals.

[0008] Preferably, the leaky cable monitoring device further includes a signal source control module, a monitoring data analysis module, and a data reporting interface. Among them, the signal source control module realizes the transmission and demodulation control of a high-precision test signal source through a control logic circuit. The monitoring data analysis module receives the phase calculation data of the DPS chip, analyzes the return loss and time difference of the leaky cable monitoring signal, and calculates the location of the leaky cable fault. The data reporting interface sends the monitoring results and alarm information to the superior management platform through the SNMP protocol.

[0009] Preferably, the signal source monitoring device includes a signal source monitoring host and a second power module. The signal source monitoring host is connected to the second power module. Four RF connectors for type-II connection with the RF optical cross-connect box are provided on the signal source monitoring host.

[0010] Preferably, the signal source monitoring device further includes a signal source monitoring control module, a data storage control module, a remote management module, and a data reporting interface. Among them, the signal source monitoring control module controls the signal source monitoring unit through AT commands, collects the signal source field strength and quality information reported by the signal source detection unit. The data storage control module is the management unit of the device memory, realizes the initialization, reading and writing management of the memory, stores the signal source field strength and quality information in the memory, and sends the stored data to the data reporting interface after reading. The remote management module is the management apache service module, and realizes the management of device parameters and operating status through a WEB page. The data reporting interface sends the monitoring results and alarm information to the superior management platform through the SNMP protocol.

[0011] Preferably, the RF connector adopts a TNC to SMA connector, with a flange, a spacing of 12.7 mm, and includes a waterproof gasket.

[0012] Preferably, the first power module includes an AC220V power supply, a power interface, and an optical fiber interface. The AC220V power supply is respectively connected to the power interface, the leaky cable monitoring host core module, and the signal source monitoring host. The optical fiber interface is signal-connected to the leaky cable monitoring host core module.

[0013] Beneficial effects:

[0014] The present invention provides two technical strategies. One is real-time monitoring: the leaky cable monitoring host monitors the status of the leaky cable and can immediately report the fault location exceeding the threshold value. The signal source monitoring host monitors the status of the signal source in real time and can immediately report the status of the signal source and the passive device link. The other is to analyze the deterioration trend of indicators through big data: for points with chronic deterioration, early prediction can be made, the abnormal state of the wireless communication system can be sensed, early prediction and countermeasures can be taken, and the impact of the failure of the entire wireless communication link on operation can be reduced. Through the above two means, the monitoring and maintenance problems of leaky cables (including ancillary facilities on the wireless communication link) in urban rail transit can be completely solved, the manpower input can be effectively reduced, and the operation and maintenance cost can be reduced. Brief description of the drawings

[0015] Figure 1 It is the system networking diagram of the present invention;

[0016] Figure 2 It is the working principle diagram of the in-station equipment of the present invention;

[0017] Figure 3 It is Figure 2 The detailed structure diagram at position A in

[0018] Figure 4 It is Figure 2 The detailed structure diagram at position B in

[0019] Figure 5 It is the structure diagram of the leaky cable monitoring equipment of the present invention.

[0020] In the figure: 1. Central equipment; 11. Monitoring server; 12. Monitoring terminal; 2. In-station equipment; 21. Leaky cable monitoring host; 211. Leaky cable monitoring equipment; 211a. Monitoring host core module; 211b. Signal source monitoring host; 211c. First power module; 212. Signal source monitoring equipment; 212b. Second power module; 22. RF optical cross-connect box; 221. RF optical cross-connect box type I; 222. RF optical cross-connect box type II; 23. Feeder; 3. Central aggregation switch; 4. In-station access switch. Specific embodiments

[0021] Next, in combination with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0022] The present invention provides a leaky cable intelligent integrated monitoring system, asFigures 1 to 5 As shown, it includes a central device 1 and multiple in-station devices 2. A communication connection is provided between the central device 1 and the multiple in-station devices 2 by a switching device. The switching device includes a central aggregation switch 3 and multiple in-station access switches 4. The central aggregation switch 3 is connected to the central device 1, and the multiple in-station access switches 4 are respectively connected to the multiple in-station devices 2 one by one. The central device 1 includes a monitoring server 11 and a monitoring terminal 12;

[0023] The in-station device 2 includes a leaky cable monitoring host 21, a radio frequency optical distribution box 22, and a feeder 23 connecting the leaky cable monitoring host 21 and the radio frequency optical distribution box 22. The radio frequency optical distribution box 22 includes a radio frequency optical distribution box type I 221 and a radio frequency optical distribution box type II 222. The radio frequency optical distribution box type I 221 includes an insertion duplexer, a bridge, and a power divider. Its main functions are to isolate and couple test signals for the leaky cable monitoring device 211, couple source signals, and provide radio frequency direct connection for the RRU source. There are four identical insertion duplexers inside, and one is used for each path of signals. The radio frequency optical distribution box type II 222 includes an insertion duplexer, a bridge, a power divider, and a radio frequency load. Its main functions are to couple source signals for the source monitoring device 212, provide a test signal load for the leaky cable monitoring device 211, and provide source direct connection for the RRU source. There are four identical insertion duplexers inside, and one is used for each path of signals. The leaky cable monitoring device 211 and the radio frequency optical distribution box type I 221 are used in pairs, and the source monitoring device 212 and the radio frequency optical distribution box type II 222 are used in pairs. In engineering applications, these two combinations are arranged at intervals. The leaky cable monitoring host 21 provides four detection signals, which are transmitted into the leaky cable through the insertion duplexer in the radio frequency optical distribution box type I 221 and absorbed by the insertion duplexer load in the radio frequency optical distribution box type II 222 for the monitoring of four leaky cables. The A and B network signals of two RRUs are directly connected to the leaky cable through the radio frequency optical distribution box 22, and at the same time, four signals are coupled to the source monitoring host 211b. The source monitoring host 211b judges the working states of passive devices and sources by analyzing and judging the four coupled signals. The leaky cable monitoring host 21 includes a leaky cable monitoring device 211 and a source monitoring device 212. The leaky cable monitoring device 211 includes a leaky cable monitoring host core module 211a, a source monitoring host 211b, and a first power module 211c. The leaky cable monitoring host core module 211a is connected to the source monitoring host 211b, and both are connected to the first power module 211c. A total of eight radio frequency connectors connected to the radio frequency optical distribution box type I 221 are provided on the leaky cable monitoring host core module 211a and the source monitoring host 211b. The radio frequency connectors use TNC to SMA connectors, with flange plates, a spacing of 12.7 mm, and waterproof rubber gaskets. The first power module 211c includes an AC220V power supply, a power interface, and an optical fiber interface. The AC220V power supply is respectively connected to the power interface, the leaky cable monitoring host core module 211a, and the source monitoring host 211b. The optical fiber interface is signal-connected to the leaky cable monitoring host core module 211a;

[0024] The leakage cable monitoring device 211 further includes a signal source control module, a monitoring data analysis module, and a data reporting interface. The signal source control module realizes the transmission and demodulation control of a high-precision test signal source through a control logic circuit. The monitoring data analysis module receives the phase calculation data of the DPS chip, analyzes the return loss and time difference of the leakage cable monitoring signal, and calculates the location of the leakage cable fault. The data reporting interface sends the monitoring results and alarm information to the superior management platform through the SNMP protocol;

[0025] The signal source monitoring device 212 includes a signal source monitoring host 211b and a second power supply module 212b. The signal source monitoring host 211b is connected to the second power supply module 212b. Four RF connectors connected to the RF optical cross-box type II 222 are provided on the signal source monitoring host 211b. The RF connectors adopt TNC to SMA connectors, with flange plates, a spacing of 12.7 mm, and waterproof rubber pads. The second power supply module 212b includes an AC220V power supply and a power interface. The AC220V power supply is respectively connected to the power interface and the signal source monitoring host 211b;

[0026] The signal source monitoring device 212 further includes a signal source monitoring control module, a data storage control module, a remote management module, and a data reporting interface. The signal source monitoring control module controls the signal source monitoring unit through AT commands, and collects the signal source field strength and quality information reported by the signal source detection unit. The data storage control module is the management unit of the device memory, realizes the initialization, reading and writing management of the memory, stores the signal source field strength and quality information in the memory, and sends the stored data to the data reporting interface after reading. The remote management module is the management apache service module, and realizes the management of device parameters and operating status through a WEB page. The data reporting interface sends the monitoring results and alarm information to the superior management platform through the SNMP protocol.

[0027] In this embodiment, the present invention provides two technical strategies. One is real-time monitoring: the leakage cable monitoring host 21 monitors the status of the leakage cable, and can immediately report the fault location exceeding the threshold value. The signal source monitoring host 211b monitors the signal source status in real time, and can immediately report the signal source and passive device link status. The other is to analyze the trend of index deterioration through big data: for the points with chronic deterioration, early prediction can be made, the abnormal state of the signal wireless communication system can be sensed, early prediction and countermeasures can be taken, and the impact of the failure of the entire wireless communication link on operation can be reduced. Through the above two means, the monitoring and maintenance problems of leakage cables (including the auxiliary facilities on the wireless communication link) in urban rail transit can be completely solved, the labor input can be effectively reduced, and the operation and maintenance cost can be reduced.

[0028] Preferably, as Figure 2As shown in the figure, the chassis of the leaky cable monitoring device 211 and the signal source monitoring device 212 can be compatible, and the material is cast lead, meeting the IP65 requirements. By making the chassis of the leaky cable monitoring device 211 and the signal source monitoring device 212 compatible, the hardware versatility can be increased and the cost can be reduced.

[0029] The working principle is as follows: As Figures 1 to 5 shown in the figure, according to the electromagnetic wave transmission theory, reflection signals will be generated at any point on the transmission line. When the cable impedance is discontinuous (i.e., when there is a leaky cable fault or excessive standing wave), the reflection signal at this point will increase. By multiplying the reflection signal with the original test sine wave signal, the phase information of the reflection signal can be extracted. This phase information is related to the round-trip time of the signal. Therefore, the position of the reflection point can be calculated through the phase information corresponding to the sine wave signals of different frequencies. At the same time, according to the magnitude of the reflection signal and the transmission loss of the leaky cable, the standing wave ratio of the fault point can be calculated;

[0030] The four signal source links of the signal source monitoring host 211b are connected to the monitoring system in sequence according to the time period. Each signal source link contains signals of Network A and Network B. The isolation degree between the signal source links is ≥ 60 dB or more, and the signal source input power is designed to be -30 dBm. Then the signal power leaked from other signal source links ≤ -90 dBm. Therefore, a threshold value (between -80 and -40 as the normal detection signal) can be set. If this low-power signal is detected, it is determined as the signal leaked from other signal source links, which specifically includes the following states;

[0031] A. If all four signal source links report Network A faults, it is determined as a Network A fault;

[0032] B. If all four signal source links report Network B faults, it is determined as a Network B fault;

[0033] C. If all four signal source links report Network A and Network B faults, it is determined as both Network A and Network B faults;

[0034] D. Except for the above three states, as long as one link reports a Network A or Network B fault, it is determined as a link fault, and the on-site personnel are required to check the specific fault point. These situations cannot cover the reports of the above three states.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A leaky cable intelligent integrated monitoring system, comprising a central device (1) and a plurality of in-station devices (2), wherein a communication connection is provided between the central device (1) and the plurality of in-station devices (2) by a switching device. Characterized in that, the central device (1) includes a monitoring server (11) and a monitoring terminal (12); the in-station device (2) includes a leaky cable monitoring host (21), a radio frequency optical distribution box (22), and a feeder cable (23) connecting the leaky cable monitoring host (21) and the radio frequency optical distribution box (22). The leaky cable monitoring host (21) includes a leaky cable monitoring device (211) and a signal source monitoring device (212). The radio frequency optical distribution box (22) includes a radio frequency optical distribution box type I (221) and a radio frequency optical distribution box type II (222). Among them, the leaky cable monitoring device (211) and the radio frequency optical distribution box type I (221) are paired for use, and the signal source monitoring device (212) and the radio frequency optical distribution box type II (222) are paired for use. The leaky cable monitoring host (21) provides four detection signals, which are transmitted into the leaky cable through an inserted duplexer in the radio frequency optical distribution box type I (221) and absorbed by the inserted duplexer load in the radio frequency optical distribution box type II (222) for the monitoring of four leaky cables. The leaky cable monitoring device (211) includes a leaky cable monitoring host core module (211a), a signal source monitoring host (211b), and a first power module (211c). The leaky cable monitoring host core module (211a) is connected to the signal source monitoring host (211b), and both are connected to the first power module (211c). A total of eight radio frequency connectors connected to the radio frequency optical distribution box type I (221) are provided on the leaky cable monitoring host core module (211a) and the signal source monitoring host (211b). The signal source monitoring host (211b) includes four signal source links, and each signal source link includes RRU A network and RRU B network signals. The A and B network signals of the two RRUs are directly connected to the leaky cable through the radio frequency optical distribution box (22), and at the same time, four signals are coupled to the signal source monitoring host (211b). The signal source monitoring host (211b) judges the working states of passive devices and signal sources by analyzing and judging the four coupled signals. The signal source monitoring device (212) includes a signal source monitoring host (211b) and a second power module (212b). The signal source monitoring host (211b) is connected to the second power module (212b). Four radio frequency connectors connected to the radio frequency optical distribution box type II (222) are provided on the signal source monitoring host (211b).

2. A leaky cable intelligent integrated monitoring system according to claim 1, Characterized in that, the switching device includes a central aggregation switch (3) and a plurality of in-station access switches (4). The central aggregation switch (3) is connected to the central device (1), and the plurality of in-station access switches (4) are respectively connected to the plurality of in-station devices (2) in one-to-one correspondence.

3. A leaky cable intelligent integrated monitoring system according to claim 1, Characterized in that, The leakage cable monitoring device (211) further includes a signal source control module, a monitoring data parsing module, and a data reporting interface. Among them, the signal source control module realizes the transmission and demodulation control of a high-precision test signal source through a control logic circuit. The monitoring data parsing module receives the phase calculation data of the DPS chip, analyzes the return loss and time difference of the leakage cable monitoring signal, and calculates the location of the leakage cable fault. The data reporting interface sends the monitoring results and alarm information to the superior management platform through the SNMP protocol.

4. An intelligent integrated monitoring system for leakage cables according to claim 1, characterized in that, the signal source monitoring device (212) further includes a signal source monitoring control module, a data storage control module, a remote management module, and a data reporting interface. Among them, the signal source monitoring control module controls the signal source monitoring unit through AT commands, collects the signal source field strength and quality information reported by the signal source detection unit. The data storage control module is the management unit of the device memory, realizes the initialization, reading and writing management of the memory, stores the signal source field strength and quality information in the memory, and sends the stored data to the data reporting interface after reading. The remote management module is the management apache service module, and realizes the management of device parameters and operating status through a WEB page. The data reporting interface sends the monitoring results and alarm information to the superior management platform through the SNMP protocol.

5. An intelligent integrated monitoring system for leakage cables according to claim 1, characterized in that, the RF connector adopts a TNC to SMA connector, with a flange, a spacing of 12.7 mm, and includes a waterproof gasket.

6. An intelligent integrated monitoring system for leakage cables according to claim 1, characterized in that, the first power supply module (211c) includes an AC220V power supply, a power supply interface, and an optical fiber interface. The AC220V power supply is respectively connected to the power supply interface, the core module of the leakage cable monitoring host (211a), and the signal source monitoring host (211b). The optical fiber interface is signal-connected to the core module of the leakage cable monitoring host (211a).

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