CN113055092B - Equipment and method for improving communication transmission safety of existing signal equipment - Google Patents
Equipment and method for improving communication transmission safety of existing signal equipment Download PDFInfo
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- CN113055092B CN113055092B CN202110285887.3A CN202110285887A CN113055092B CN 113055092 B CN113055092 B CN 113055092B CN 202110285887 A CN202110285887 A CN 202110285887A CN 113055092 B CN113055092 B CN 113055092B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a device and a method for improving the communication transmission security of existing signal equipment, wherein the method comprises the following steps: and during the normal communication period among the signal devices, the error rate of message transmission is monitored in real time so as to obtain the operating environment information of the signal devices, which can be used by operation and maintenance personnel during the inspection. The invention adds the function of real-time monitoring of the error rate, provides the information of the operating environment of the signal equipment and can be used when the operation and maintenance personnel check the equipment. The invention does not need to modify the system software of the signal equipment, only changes the connecting line into the plastic optical fiber on the hardware, has low equipment modification cost, and is simple and easy to operate and maintain. The optical fiber is transmitted by using visible light, so that the optical fiber is not influenced by electromagnetic interference, and the error rate in the transmission process can be reduced, thereby improving the reliability of signal equipment. The invention can improve the safety of signal equipment, and can meet the requirements of EN50159:2010, quantitatively calculating indexes of failure rate of the safety transmission system.
Description
Technical Field
The invention relates to the field of urban rail transit, in particular to equipment and a method for improving communication transmission safety of existing signal equipment.
Background
Urban rail transit firstly enters China from 1969, has become a main travel choice of people through several decades of steady development, and plays an important role in the urbanization development of China. The signal equipment is used as an important component of urban rail transit and bears the responsibility of ensuring the running safety of the train. However, some line devices have reached the age of over 20 years, due to the fact that some existing signaling devices are old and have a long running time. These devices have been used for many years, and various problems are gradually revealed, many signal products are also facing to the updating and upgrading requirements, and in order to meet the smooth upgrading transition requirements of the signal devices, the signal products need to modify part of the signal system, or the signal system needs to be modified and upgraded in a staged and stepped distribution manner.
Referring to fig. 1, fig. 1 is a schematic structural diagram of two conventional signal devices, and fig. 1 specifically illustrates a connection relationship between the two signal devices. In the process of upgrading and updating signal equipment, when a new signal system integrates existing signal equipment and needs to be compatible with an external interface of the existing signal equipment, an existing transmission mode that communication transmission is performed through an RS485 port via an insulated twisted pair cable and a security layer of a transmission protocol is only simple 31-bit CRC (which is called cyclic redundancy check, wherein the interpretation is a cyclic redundancy check code) protection cannot meet EN50159:2010 for quantitative requirements on secure communication. In this regard, conventional solutions are to modify the transmission protocol, and to strengthen the protection strength of the communication protocol, such as to add the two-channel CRC protection. However, this type of solution requires software development and update of both the newly added device and the existing signal device according to the enhanced protocol requirements, which has a large impact on the existing device and may cause the requirements of the development period of the existing device and uncertainty of the system reliability.
Disclosure of Invention
The invention aims to provide a device and a method for improving communication transmission safety of an existing signal device, which improve the safety of the existing signal device on the transmission device and the software function. In the aspect of transmission equipment, a transmission medium of messages between signal equipment is modified, and the influence of electromagnetic interference on the transmission process is reduced; in the aspect of software functions, the real-time monitoring of the transmission error rate is increased, and once unacceptable interference exists in a transmission environment, an alarm that the error rate is out of limit is sent to field operation and maintenance personnel to remind relevant personnel of intervention improvement.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method of improving security of communication transmissions of an incumbent signaling device, the method comprising:
and during the normal communication period among the signal devices, the error rate of message transmission is monitored in real time so as to obtain the running environment information of the signal devices, which can be used by operation and maintenance personnel during the inspection.
Optionally, the real-time monitoring specifically includes:
s1, judging whether a new message is received, if so, executing the step S2, otherwise, repeating the step S1;
s2, analyzing the message packet and calculating the error rate of the message packet;
and S3, judging whether the error rate of the message packet exceeds a preset error rate threshold value, if so, sending an alarm that the error rate is out of limit, and if not, repeating the step S1.
Optionally, the step S2 specifically includes:
s201, analyzing the message packet, and acquiring application Data Data _ rec, CRC code CRC _ rec and message Length _ rec in the message packet;
s202, respectively calculating according to application Data _ rec and CRC code CRC _ rec to obtain an application Data calculation value Data _ cal and a CRC code calculation value CRC _ cal;
s203, calculating the number Dir _ Data of the difference between the application Data _ rec and the application Data calculation value Data _ cal and the number Dir _ CRC of the difference between the CRC CRC _ rec and the CRC calculation value CRC _ cal, and selecting the smaller value of the two as the error code number BE _ new of the message packet after comparison;
s204, updating the total error number BE and the total Length of the received message Length according to the error number BE _ new and the message Length _ rec in the message packet respectively;
s205, judging whether the total Length of the received message exceeds a preset Length threshold, if so, subtracting the Length _ bottom of the oldest message packet in the stored historical message from the total Length of the received message, subtracting the number BE _ bottom of the oldest message packet in the historical message from the total number BE of the error codes, and then calculating the BER of the message transmission by the following formula: if not, directly calculating the bit error rate BER of the message transmission, specifically calculating by the following formula: BER is BE/Length;
s206, judging whether the bit error rate BER is larger than a preset bit error rate threshold value, if so, sending an alarm that the bit error rate is out of limit, and if not, repeating the step S201.
Optionally, the signal devices communicate with each other through optical fibers.
In another aspect, the present invention also discloses a maintenance terminal comprising a processor and a computer-readable storage medium storing computer-executable instructions executable by the processor to perform the method according to any one of claims 1 to 5.
In another aspect, the present invention also discloses an apparatus for improving communication transmission security of an existing signal apparatus, including:
a first EMC module mounted on a cabinet of an existing signal device;
a second EMC module mounted on a cabinet of another existing signal device;
and the two ends of the optical fiber are respectively connected with the first EMC module and the second EMC module.
Optionally, the first EMC module is a serial-to-optical fiber module, and/or the second EMC module is an optical-to-serial module.
Optionally, the optical fiber is a plastic optical fiber.
In other aspects, the invention also discloses equipment for improving the communication transmission safety of the existing signal equipment, which comprises the maintenance terminal.
Optionally, the apparatus comprises:
a first EMC module mounted on a cabinet of an existing signal device;
a second EMC module mounted on a cabinet of another existing signal device;
and the two ends of the optical fiber are respectively connected with the first EMC module and the second EMC module.
Optionally, the first EMC module is a serial-to-optical fiber module, and/or the second EMC module is an optical fiber-to-serial module.
Optionally, the optical fiber is a plastic optical fiber.
Compared with the prior art, the invention has at least one of the following advantages:
the invention can improve the safety of signal equipment, and can meet the requirements of EN50159:2010, quantitatively calculating indexes of failure rate of the safety transmission system.
The invention adds the function of real-time monitoring of the error rate, provides the information of the operating environment of the signal equipment and can be used when the operation and maintenance personnel check the equipment.
The invention does not need to modify the system software of the signal equipment, only changes the connecting line into the plastic optical fiber on the hardware, has low equipment modification cost, and is simple and easy to operate and maintain. Because the optical fiber uses visible light transmission, the optical fiber is not influenced by electromagnetic interference, and the error rate in the transmission process can be reduced, thereby improving the reliability of signal equipment.
Drawings
FIG. 1 is a schematic diagram of two signaling devices in the prior art;
FIG. 2 is a schematic diagram of two signaling devices according to an embodiment of the present invention;
fig. 3 is a flowchart of a real-time monitoring method according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings 1 to 3 and the detailed description thereof. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus and method for improving the security of an incumbent signal device communication transmission, an article, or a field device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus and method for improving the security of an incumbent signal device communication transmission, an article, or a field device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, apparatus and method, article, or field device that comprises the element, that improves the security of communication transmissions by existing signaling devices.
The embodiment provides a method for improving communication transmission security of existing signal equipment, which comprises the following steps: and during the normal communication period among the signal devices, the error rate of message transmission is monitored in real time so as to obtain the running environment information of the signal devices, which can be used by operation and maintenance personnel during the inspection.
In this embodiment, the real-time monitoring function is independent of the normal communication function of the signal system (i.e., the short term rail transit signal system), and does not affect the execution logic of the communication function.
Referring to fig. 3, fig. 3 is a flowchart of real-time monitoring in the embodiment, where the real-time monitoring specifically includes:
s1, the maintenance terminal judges whether a new message is received, if yes, the step S2 is carried out, and if not, the step S1 is repeated;
s2, the maintenance terminal analyzes the message packet and calculates the error rate of the message packet;
s3, the maintenance terminal judges whether the error rate of the message packet exceeds a preset error rate threshold value, if yes, an alarm that the error rate is out of limit is sent to the maintenance terminal, and if not, the step S1 is repeated.
In this embodiment, the step S2 specifically includes:
s201, the maintenance terminal analyzes the message packet and acquires application Data Data _ rec, CRC code CRC _ rec and message Length _ rec in the message packet;
s202, the maintenance terminal respectively calculates and obtains an application Data calculation value Data _ cal and a CRC code calculation value CRC _ cal based on a polynomial division method according to the application Data _ rec and the CRC code CRC _ rec;
s203, the maintenance terminal calculates the number Dir _ Data of the difference between the application Data _ rec and the application Data calculation value Data _ cal and the number Dir _ CRC of the difference between the CRC code CRC _ rec and the CRC code calculation value CRC _ cal, and selects the smaller value of the Dir _ Data and the Dir _ CRC as the Bit Error number (Bit Error) BE _ new of the message packet after comparison;
if Dir _ data is Dir _ CRC, it indicates that the current message has no error code, otherwise, if the minimum value is Dir _ data, it indicates that the error code exists in the application message, and if the minimum value is Dir _ CRC, it indicates that the error code exists in the CRC code;
it should be noted that the number of errors obtained by the method is an estimated value, on the premise that each packet of message does not have errors in both the application data and the CRC. Because the transmission error code is below 10e-4 in actual use, the probability of the simultaneous error codes in the application data and the CRC is extremely low and can be ignored;
s204, the maintenance terminal updates the total error code number BE and the total Length of the received message Length according to the error code number BE _ new and the message Length _ rec in the message packet, namely BE + BE _ new and Length + Length _ rec;
s205, the maintenance terminal judges whether the total Length of the received message is greater than a preset Length threshold value 1e8, if yes, the total Length of the received message is subtracted by the Length _ bottom of the oldest message packet in the stored historical message, the total error number BE is subtracted by the error number BE _ bottom of the oldest message packet in the historical message, and then the BER is calculated by the following formula: if not, directly calculating the message transmission bit error rate BER, specifically calculating by the following formula: BER/Length, and storing related variables BE, Length, BE _ new and Length _ rec;
s206, the maintenance terminal judges whether the bit error rate BER is larger than a preset bit error rate threshold value 1e-4, if yes, the maintenance terminal sends an alarm that the bit error rate is out of limit, and if not, the step S201 is repeated.
Wherein the polynomial applied by the polynomial division is pre-stored or generated according to pre-stored generation rules. In this embodiment, the specific polynomial form and the specific polynomial generation rule are not particularly limited as long as the corresponding application Data calculation value Data _ cal and CRC code calculation value CRC _ cal can be calculated.
In this embodiment, the signal devices communicate with each other through optical fibers, and the optical fibers are plastic optical fibers.
It should be emphasized that the message packet in this embodiment is transmitted through the optical fiber as a medium, and the optical fiber uses visible light for communication, so as to avoid the interference of lightning and electromagnetic, make up for the defect of insufficient electromagnetic interference resistance of twisted pair transmission, reduce the error rate generated by electromagnetic interference in the message transmission process, and further improve the accuracy of real-time monitoring.
In addition, the existing signal devices basically adopt a twisted pair as a medium for message transmission, so that distributed capacitance generated between two RS485 communication lines and common mode interference generated around a communication coil can be reduced or even eliminated, and in the process of upgrading and updating the signal devices, a conventional solution is to modify a transmission protocol or enhance the protection strength of the communication protocol (the signal system is always updated and updated at the software level in the urban rail transit development till now, and technicians in the field are difficult to obtain a motivation for improving the medium or a maintenance terminal so as to enable the existing signal devices to be updated and updated smoothly), so that the existing signal devices need to be developed and updated according to the requirements of the enhanced protocol, and the influence on the existing devices is too large. The embodiment can effectively solve the above problems, the real-time monitoring of the message transmission error rate is an added function on the maintenance terminal, and the replacement of the message transmission medium with the optical fiber only needs to add a corresponding EMC module (which is called as an ElectroMagnetic Compatibility module in english all), and does not need to change the signal equipment greatly.
Based on the same inventive concept, the embodiment also discloses a maintenance terminal, which comprises a processor and a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions capable of being executed by the processor, and the processor executes the computer-executable instructions to implement the method.
Based on the same inventive concept, the present embodiment further provides an apparatus for improving communication transmission security of an existing signal apparatus, where the apparatus includes:
the serial port-to-optical fiber module (namely an EMC module) is arranged on a cabinet of existing signal equipment;
the optical fiber-to-serial port module (namely an EMC module) is installed on a cabinet of another existing signal device;
and one end of the optical fiber is connected with the output end of the serial port-to-optical fiber module, and the other end of the optical fiber is connected with the input end of the optical fiber-to-serial port module.
Referring to fig. 2, fig. 2 is a schematic structural diagram of two signaling devices in the present embodiment, and fig. 2 illustrates a connection relationship between the two signaling devices in the present embodiment.
In this embodiment, a communication connection line between existing signal devices is replaced with an optical fiber from an original insulated twisted pair, a serial port-to-optical fiber module and an optical fiber-to-serial port module that are matched with the optical fiber are configured on a cabinet of the existing signal device, data is transmitted from one existing signal device through the serial port-to-optical fiber module and the optical fiber, and then is accessed to another existing signal device through the optical fiber-to-serial port module. The optical fiber is communicated by using visible light, so that the optical fiber is not interfered by thunder and electromagnetism, the defect of insufficient electromagnetic interference resistance of twisted pair transmission is overcome, and the error rate generated by electromagnetic interference in the message transmission process can be reduced. The reliability of the device is improved by reducing the error rate while the safety of the signal device is provided.
In this embodiment, the optical fiber is a plastic optical fiber.
In other embodiments, an apparatus for improving communication transmission security of an existing signal apparatus includes the above-mentioned maintenance terminal, serial-to-optical fiber module, optical fiber-to-serial module, and optical fiber; the serial port-to-optical fiber module is arranged on a cabinet of an existing signal device; the optical fiber serial port conversion module is arranged on the other cabinet of the existing signal equipment; one end of the optical fiber is connected with the output end of the serial port-to-optical fiber module, and the other end of the optical fiber is connected with the input end of the optical fiber-to-serial port module. Wherein the optical fiber is a plastic optical fiber.
The safe communication standard EN50159:2010 defines a failure model of a transmission system under the influence of EMI (electro magnetic Interference, Chinese is explained as Electromagnetic Interference), the communication error rate of the worst case that an insulated twisted pair meets the standard is generally 1e-4, the undetectability rate of errors which can be achieved by 31-bit CRC is 4.66e-10, the final EMI failure rate in the message transmission process of the existing signal equipment can be obtained by combining the data, and the failure rate cannot reach the standard EN 50129: 2018 for signal equipment failure rate.
Wherein, the calculation process is shown in the following table:
in the above table, the values of Bit and Fm are application examples, and may be adjusted according to actual application scenarios.
Through analysis, two key indexes causing the final EMI failure rate not to reach the standard are obtained, namely the error rate and the undetectability rate of CRC errors. The CRC strength needs to be increased when the undetectability rate of the CRC errors is improved, and if measures such as double-channel CRC are adopted in a message packet, system software needs to be modified, so that the design change content is more, and the cost is high. Therefore, the embodiment improves the safety of the existing signal equipment by reducing the transmission error rate.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (5)
1. A method for improving communication transmission security of an existing signaling device, the method comprising:
during the normal communication period among the existing signal devices, carrying out real-time monitoring on the error rate of message transmission so as to obtain the running environment information of the signal devices, which can be used by operation and maintenance personnel during the inspection;
the real-time monitoring specifically comprises:
s1, judging whether a new message is received, if so, executing the step S2, otherwise, repeating the step S1;
s2, analyzing the message packet and calculating the error rate of the message packet;
s3, judging whether the error rate of the message packet exceeds a preset error rate threshold value, if so, sending an alarm that the error rate is out of limit, and if not, repeating the step S1;
the step S2 specifically includes:
s201, analyzing the message packet, and acquiring application Data Data _ rec, CRC code CRC _ rec and message Length _ rec in the message packet;
s202, respectively calculating according to application Data _ rec and CRC code CRC _ rec to obtain an application Data calculation value Data _ cal and a CRC code calculation value CRC _ cal;
s203, calculating the number Dir _ Data of the difference between the application Data _ rec and the application Data calculation value Data _ cal and the number Dir _ CRC of the difference between the CRC code CRC _ rec and the CRC calculation value CRC _ cal, and selecting the smaller value of the two as the error code number BE _ new of the message packet after comparison;
s204, updating the total error number BE and the total Length of the received message Length according to the error number BE _ new and the message Length _ rec in the message packet respectively;
s205, judging whether the total Length of the received message exceeds a preset Length threshold, if so, subtracting the Length _ bottom of the oldest message packet in the stored historical message from the total Length of the received message, subtracting the number BE _ bottom of the oldest message packet in the historical message from the total number BE of the error codes, and then calculating the BER of the message transmission by the following formula: if not, directly calculating the bit error rate BER of the message transmission, specifically by the following formula: BER is BE/Length;
s206, judging whether the bit error rate BER is larger than a preset bit error rate threshold value, if so, sending an alarm that the bit error rate is out of limit, and if not, repeating the step S201;
the signal devices communicate with each other through optical fibers.
2. A maintenance terminal comprising a processor and a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions executable by the processor to perform the method of claim 1.
3. A device for improving the security of communication transmissions of an existing signaling device, the device comprising a maintenance terminal according to claim 2;
the apparatus comprises:
a first EMC module mounted on a cabinet of an existing signal device;
a second EMC module mounted on a cabinet of another existing signal device;
and the two ends of the optical fiber are respectively connected with the first EMC module and the second EMC module.
4. The apparatus for improving communication transmission security of an incumbent signaling device of claim 3, wherein the first EMC module is a serial-to-fiber module, and/or the second EMC module is a fiber-to-serial module.
5. The apparatus for improving communication transmission security of an incumbent signaling device of claim 3, wherein the optical fiber is a plastic optical fiber.
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| CN108964757A (en) * | 2017-05-19 | 2018-12-07 | 北京华为数字技术有限公司 | Signal errors alarm method and device |
| CN108933631A (en) * | 2017-05-27 | 2018-12-04 | 中国电信股份有限公司 | Light power control method, device and the optical network system of optical network unit |
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