CN112564840A - Time credibility calibration system for traffic monitoring network and operation method thereof - Google Patents
Time credibility calibration system for traffic monitoring network and operation method thereof Download PDFInfo
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- CN112564840A CN112564840A CN202011383910.4A CN202011383910A CN112564840A CN 112564840 A CN112564840 A CN 112564840A CN 202011383910 A CN202011383910 A CN 202011383910A CN 112564840 A CN112564840 A CN 112564840A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- H—ELECTRICITY
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Abstract
The invention provides a time credible calibration system for a traffic monitoring network and an operation method thereof. The system includes a trusted time source (10) sourced to the UTC and a private transportation network (20). The operation method comprises the following steps: the method comprises the steps that UTC time is introduced into a network time protocol server in the special transportation network from a traceable time source outside the special transportation network to a trusted time source of UTC through a safety special line, the reliable and credible time in the special transportation network is ensured, the traceable time to the UTC has an uncertainty value, in the special transportation network, a time calibration service and certificate system is communicated with a time calibration measurement terminal, the time calibration measurement terminal is used for measuring and calibrating the time of the accessed traffic monitoring equipment, original data are returned to the time calibration service and certificate system, a time calibration electronic certificate of each equipment is issued by the time calibration service and certificate system according to a calibration standard, and in the network, the trusted timestamp system is used for ensuring the integrity of the content of the original measurement data and certificate system, such as non-tampering, non-repudiation and data content.
Description
Technical Field
The invention relates to a system and a method for realizing time calibration of each backup in a traffic monitoring network, in particular to a credible and reliable system and a method for realizing high-frequency remote online calibration and time service of time of network access monitoring equipment in advance under the condition of meeting the requirements of traffic private network safety, time calibration operation specifications and system information safety.
Background
With the development and progress of society, traffic is developed and advanced more and more, and a traffic monitoring network is formed in each big city and high-speed kilometers. In a traffic monitoring network, signal lamps, cameras, speed measuring radars, terminal servers and the like need to unify traceable trusted time. If the time such as traffic signals is inaccurate, traffic jam is easily caused, and if the time of a speed measuring radar is inconsistent, errors are easily caused when overspeed is judged in an interval. Therefore, the time of the equipment in the traffic monitoring network needs to be regularly detected, verified, calibrated and timed, so as to ensure that the time of each equipment can be unified and traceable. And the institution performing the time calibration and certification is the institution or business that acquired these qualifications.
With the refinement of traffic monitoring and the introduction of intelligent traffic, the more and more devices in a traffic monitoring network are provided, and the more and more requirements for time detection, verification and calibration are required. Current detection, verification and calibration and timing generally take two forms: firstly, an organization with time calibration qualification carries out manual verification and calibration on equipment in a laboratory or on site according to regulations; and secondly, a satellite communication time service (GNSS) chip and software are installed on the equipment, and time service is carried out through a GPS and a Beidou.
Scheme one (artifical examination and calibration), increasingly unsatisfied the demand of equipment to time calibration that increases, the frequency of once calibrating every year also can not satisfy actual demand moreover, has the inefficiency and is difficult to realize the problem of high frequency detection.
In the second scheme (satellite communication time service), although the problems of efficiency and high frequency of calibration and time service can be solved, two problems exist: firstly, a satellite communication time service chip is arranged on each device, so that the cost is increased; secondly, because the traffic monitoring network is often a private network with a clear security boundary with the public internet, the potential risk of destroying the specificity of the traffic monitoring network with the clear security boundary with the public internet can be generated by installing a satellite communication time service chip on each device.
Therefore, the problems of time unification and traceability of more and more devices in the traffic monitoring network are solved by the existing method, and a plurality of difficulties exist.
How to carry out high-efficiency and high-frequency remote online calibration, time service, measurement and verification on more and more equipment time in a traffic monitoring network in advance of meeting the requirements of traffic private network safety, time calibration operation specifications and system information safety is a difficult problem to be solved for traffic monitoring fine management and intelligent traffic realization.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a time credible calibration system and method for a traffic monitoring network, so as to realize high-efficiency and high-frequency remote online calibration, time service, measurement and verification of more and more equipment time in the traffic monitoring network, and simultaneously meet the requirements of traffic private network security, time calibration operation specifications and system information security.
Compared with a manual on-site or laboratory verification and calibration scheme, the method has the remarkable advantages of high efficiency and high frequency of remote online.
1) The manual verification and calibration is usually performed 1 time per year, and the invention is to perform measurement once every 10 minutes and perform calibration once a day.
2) The invention relates to a method for calibrating a set of equipment by manual verification and calibration in a single time period.
3) The manual verification and calibration usually stops the equipment from working in the calibration process to carry out calibration, the invention does not need to stop the equipment from working, realizes measurement and calibration in situ on line, and has the advantages of high efficiency and low cost.
4) Compared with manual verification and calibration, the invention can find time-shifted equipment and calibrate the equipment in time due to high-frequency measurement, and can give an alarm and prompt for equipment with serious problems at the first time so as to reduce the loss caused by the problems to the minimum.
5) Compared with manual verification and calibration, the invention accumulates real measurement big data for the network access equipment due to high-frequency measurement, can carry out big data mining and analysis on different manufacturer equipment and different types of equipment under different external working conditions (humidity, temperature and the like), provides data support for equipment purchase, and provides prediction prompt for equipment update.
Compared with a satellite communication time service scheme, the method has the remarkable advantages of network security and low cost.
1) Compared with a satellite communication time service scheme (a channel communicated with the outside of a special traffic network is introduced into each device), the device provided by the invention does not need to be communicated with the outside of the special traffic network, and only one device is communicated with a controllable credible time service of a metering mechanism. The safety of the invention has significant advantages.
2) Compared with a satellite communication time service scheme (a satellite communication is installed for each device, a software and hardware system of the device is redesigned, and the realization of a large number of existing old devices is almost impossible), the method and the system have the advantages that the cost is obviously reduced and the obvious advantages are realized by calibrating the measuring terminal and a plurality of sets of servers in a software mode and combining time.
In order to achieve the above purpose, the present invention provides a time credible calibration system and method for a traffic monitoring network, which sequentially comprises the following steps:
step S201: the trusted time server (102) gives time to a time server (203) in the special traffic network (20) and performs regular calibration;
step S202: the time server (203) gives time to the traffic platform center (202), the trusted timestamp service system (204), the time calibration service and certificate system (205) and the time service terminal (215) and carries out time service and periodic calibration;
step S203: the time service terminal (215) measures the device time in its local area network and returns time measurement data to the time alignment service and certification system (205);
step S204: the time service terminal (215) calibrates the equipment in the local area network thereof through the network switch (211);
step S205: after receiving the time measurement data, the time calibration service and certificate system (205) stamps a time on the trusted time stamp service system (204) and stores the data;
step S206: the time calibration service and certificate system (205) generates a time calibration certificate and a time detection report, and stamps a time to the trusted time stamping service system (204) to store the certificate and the report;
after step S206, step S207 is performed: and performing data statistical analysis on the equipment time information, and sending a result and early warning information to a traffic platform center (202).
After step S206, a step S208 is performed in which the metrological certification authority issues certification certificates based on the complete tamper-free equipment time detection report and calibration report.
Drawings
FIG. 1 is a schematic diagram of a time confidence calibration system for a traffic monitoring network according to the present invention;
FIG. 2 is a schematic diagram illustrating an operation process of the time trusted calibration system for a traffic monitoring network according to the present invention;
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings 1-2 and the following detailed description.
As shown in fig. 1, a schematic diagram of a time trusted calibration system for a traffic monitoring network is provided, and the system can be divided into a trusted time source 10 from source to UTC (time coordinated) and related systems in a private transportation network 20.
The functions of the structures are explained below:
the trusted time source 10, which is sourced to UTC (time coordinated time), includes: the method comprises the steps that a national time reference or time standard 101 (such as a cesium atomic clock and a hydrogen atomic clock, and the key point is that the time reporting is kept consistent with the UTC by participating in UTC), which is consistent with the UTC, is served and calibrated by a trusted time server 102 (which can be based on a network time protocol NTP or a high-precision time protocol PTP server), so that the time of the trusted time server 102 is also traced to the UTC, and then is served and calibrated outwards by the trusted time server 102.
The private transportation network 20 comprises an original private transportation network firewall 201, a transportation platform center 202, a network switch 211, a transportation service terminal 212, a camera 213 and a speed measuring radar 214, and is additionally provided with a time server 203, a trusted timestamp service system 204, a time calibration service and certificate system 205 and a time service terminal 215 for time measurement, verification, calibration and time service.
The time server 203 is responsible for linking with the trusted time server 102, obtaining trusted time consistent with UTC, and simultaneously, measuring, verifying, calibrating and timing the equipment time of the network access as a trusted time source in the private transportation network 20.
The time alignment service and certification system 205 is responsible for storing the measurement data, the detection data report, and the calibration report for each device time, and providing the time data report for the transportation platform center.
The trusted timestamp service system 204 is responsible for timestamping the time measurement data and the certificate, and ensuring the security and integrity of the measurement data and the certificate report data.
The time service terminal 215 is responsible for time synchronization with the time server 203, and then transmits the UTC time to each traffic device (the traffic service terminal 212, the camera 213, and the speed radar 214) under its jurisdiction in the NTP protocol manner, and at the same time, forwards the time measurement data of each traffic device (the traffic service terminal 212, the camera 213, and the speed radar 214) to the time calibration service and certificate system 205 for storage. The time service terminal 215 may be a hardware unit including the above functions, or may be software including the above functions, and operates in the transportation service terminal 212.
FIG. 2 is a schematic diagram illustrating an operation process of the time trusted calibration system for a traffic monitoring network according to the present invention; as shown in fig. 2, the operation process of the time credible calibration system for a traffic monitoring network includes the following process steps:
step S201: the trusted time server 102 gives time to the time server 203 in the private transportation network 20 and performs periodic calibration: after the trusted time server 102 obtains the precise time consistent with UTC (time coordinated time), it is ensured that the time with the server 102 is traced back to UTC, consistent with UTC. And then, time is given to the time server 203 through the special line security through the firewall 201 of the private transportation network, and the time is calibrated once every 10 minutes (the frequency can be set to be 1 minute, 2 minutes, 5 minutes, 10 minutes and 20 minutes according to the requirement, for example, 10 minutes is an international common practice), so that the time tracing of the time server 203 to the UTC is ensured to be consistent with the UTC.
Step S202: the time server 203 gives time and regularly calibrates to the transportation platform center 202, the trusted timestamp service system 204, the time calibration service and certificate system 205 and the time service terminal 215: a time source of NTP (network time protocol) of a server in the private transportation network 20 is set as the time server 203, time calibration is performed in the NTP manner, and a calibration frequency is set to 10 minutes (calibration is performed every 10 minutes). The time tracing of the transportation platform center 202, the trusted timestamp service system 204, the time calibration service and certificate system 205, and the time service terminal 215 to the UTC is ensured to be consistent with the UTC. And records the data at time t1, t2, t3, t4 each time each device is calibrated in NTP. t1 sending NTP request time stamps for each device (with each device's respective time as a reference); t2 is the NTP server received NTP request timestamp (referred to NTP server time); t3 is the server reply NTP request timestamp (with server time as reference); t4 is the time stamp for each device to receive the NTP reply packet (with reference to the time of each device). Let Δ t be the time offset between the NTP server and each device, d be the round-trip time of the NTP packet, assuming that the NPT request and reply packet transmission delays are equal, then: Δ t ═ ((t2-t1) - (t4-t 3))/2; d ═ t2-t1) + (t4-t 3. The difference between each device and the NTP server can be calibrated by taking the average value of Δ t from multiple measurements.
Step S203: the time service terminal 215 measures the time of the devices (the traffic service terminal 212, the camera 213, and the speed radar 214) in its local area network, and returns time measurement data to the time alignment service and certification system 205: the time service terminal 215 reads the time data of each device through the API interface of the device (the traffic service terminal 212, the camera 213, and the speed radar 214) in the local area network, and sends the local time data Ta when the time service terminal 215 sends the API request, the local time data Tb when the time service terminal 215 receives the device time, and the time data Tc read to the device to the time calibration service and certificate system 205.
Step S204: the time service terminal 215 is linked to the traffic service terminal 212 through the network switch 211. The traffic service terminal 212 controls a plurality of cameras 213 and a plurality of speed radar 214. The time service terminal 215 calibrates the devices (such as the traffic service terminal 212, the plurality of cameras 213, and the plurality of speed radars 214) in its local area network through the network switch 211: a time source of NTP (network time protocol) of a device within the local area network of the time service terminal 215 is set as the time service terminal 215, time calibration is performed in the NTP manner, and a calibration frequency is set to 10 minutes (calibration is performed every 10 minutes). And ensuring that the time of the traffic service terminal 212, the camera 213 and the speed measuring radar 214 is traced to and consistent with the UTC.
Step S205: after receiving the time measurement data, the time calibration service and certificate system 205 performs time stamping on the trusted time stamping service system 204, and stores the data: after receiving the measured time data Ta, Tb, Tc of each device sent by the time service terminal 215, the time calibration service and certificate system 205 stamps the time to the trusted time stamp service system 204, and also stamps the time data (t1, t2, t3) of the calibration record to the trusted time stamp service system 204, thereby ensuring the integrity and security of the test data. The measurement data and the time stamp data are stored. Wherein: ta is 215 local time data when the time service terminal 215 transmits the API request, Tb is 215 local time data when the time service terminal 215 receives the device time, and Tc is the local time of each device returned to the time service terminal 215. Mainly investigating whether the difference between Tc and Tb is less than 0.1 second, and if the difference is more than 0.1 second, determining that the error is too large; and (4) whether the difference between Ta and Tb is less than 0.01 second or not is examined, and if the difference is more than 0.01 second, the local area network blockage is considered to need to be checked. For t1, t2, t3, where t1 sends NTP request timestamps for each device (with reference to each device' S respective time; t2 receives NTP request timestamps for time service terminal 215 (with reference to time service terminal 215 time; t3 replies NTP request timestamps for time service terminal 215 (with reference to time service terminal 215 time) step S206: the time alignment service and certification system 205 generates a time alignment certificate, a time check report, and timestamps to trusted timestamp service system 204, stores the certificate and report, statistically analyzes measured time data for each network-entry device (service terminal 212, camera 213, and speed radar 214) each day, calculates maximum deviation, minimum deviation, average deviation, and uncertainty values, forms an electronic report of time accuracy check for each device each day, calculates calibration data for each time service terminal 215, and forming the time calibration electronic certificate. The formed electronic detection report and time calibration report/certificate are time stamped to the trusted time stamp service system 204, so that the integrity and safety of the test electronic report and the calibration electronic certificate are ensured. The test electronic report, the calibration electronic certificate, and the time stamp data are stored.
Step S207: performing data statistics analysis on the equipment time information, and sending a result and early warning information to the traffic platform center 202: and (4) statistically analyzing the time average deviation and the maximum deviation of each device, giving a deviation curve, and listing the devices with the deviations increasing along with the time and the devices with the time average deviation larger than 1 second in an early warning list (prompting to replace). The time data of each of these network access devices is sent to the transportation platform center 202 in a table format.
Step S208: the metrological verification organization issues verification certificates according to complete equipment time detection reports and calibration reports without tampering: and the metrological verification mechanism with time to verify qualification issues a verification certificate of the equipment time according to the complete equipment time detection electronic report without tampering, the calibration electronic report and the original data and the verification regulation.
The metering organization with the time detection calibration qualification can provide approved electronic reports (calibrator, auditor, approver digital signature and metering organization digital signature) according to the formats of the detection electronic reports and the calibration electronic reports according to the quality control requirements (three-level approval of calibrator, auditor and approver) according to the complete non-tampered equipment time detection electronic reports, the calibration electronic reports and the original measurement data, and the electronic reports can be used as the approved time detection electronic reports and the calibration electronic reports of the transportation equipment time.
The same principle is that: the metering organization with time certification can detect the electronic report, calibrate the electronic report and the original measurement data according to the complete equipment time without tampering, and can issue a certified electronic report (a certifier, a auditor, a digital signature of the approver and a digital signature of the metering organization) according to the format of the certified electronic report according to the quality control requirements (three-level approval of the certifier, the auditor and the approver), wherein the electronic report can be used as the certified time certification electronic report of the transportation equipment time.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such changes and modifications as fall within the true spirit and scope of the invention be considered as within the following claims.
Claims (6)
1. A time trusted calibration system for a traffic monitoring network, characterized by: the system includes a trusted time source (10) that is sourced to a time coordinated time (UTC) and a private transportation network (20).
2. The time trusted calibration system for a traffic monitoring network of claim 1, wherein: the trusted time source 10, which is sourced to time coordinated time (UTC), includes: the national time reference or time standard (101) which is consistent with the time coordinated time (UTC) is used for time service and calibration of the credible time server (102) from the national time reference or time standard (101) which is consistent with the time coordinated time (UTC), so that the time of the credible time server (102) is traced back to the time coordinated time (UTC), and then the credible time server (102) is used for time service and time calibration outwards.
3. The time trusted calibration system for a traffic monitoring network of claim 2, wherein: the private transportation network (20) includes: the system comprises a special traffic network firewall (201), a traffic platform center (202), a network switch (211), a traffic service terminal (212), a plurality of cameras (213) and a plurality of speed measuring radars (214), a time server (203) for measuring, verifying, calibrating and timing time, a trusted timestamp service system (204), a time calibration service and certificate system (205) and a time service terminal (215).
4. The time trusted calibration system for a traffic monitoring network of claim 3, wherein: the time server (203) is responsible for being linked with the trusted time server (102) to obtain trusted time consistent with time coordinated (UTC), and meanwhile, the trusted time is used as a trusted time source in the special transportation network (20) to measure, verify, calibrate and time service the equipment time of the network access; the time calibration service and certificate system (205) is responsible for storing the measurement data, the detection data report and the calibration report of each equipment time and providing the time data report for the transportation platform center; the trusted timestamp service system (204) is responsible for timestamping the time measurement data and the certificate, and ensuring the safety and integrity of the measurement data and the certificate report data; the time service terminal (215) is responsible for time synchronization with the time server (203), and then transmits UTC time to each traffic device under control in the NTP protocol mode, and meanwhile, the time measurement data of each traffic device is forwarded to the time calibration service and certificate system (205) for storage.
5. A method of operation of a time trusted calibration system for a traffic monitoring network, characterized by: a time trusted calibration system for a traffic monitoring network comprising any one of claims 1-4; the operation method of the system comprises the following steps:
step S201: the trusted time server (102) gives time to a time server (203) in the special traffic network (20) and performs regular calibration;
step S202: the time server (203) gives time to the traffic platform center (202), the trusted timestamp service system (204), the time calibration service and certificate system (205) and the time service terminal (215) and carries out time service and periodic calibration;
step S203: the time service terminal (215) measures the device time in its local area network and returns time measurement data to the time alignment service and certification system (205);
step S204: the time service terminal (215) calibrates the equipment in the local area network thereof through the network switch (211);
step S205: after receiving the time measurement data, the time calibration service and certificate system (205) stamps a time on the trusted time stamp service system (204) and stores the data;
step S206: the time calibration service and certificate system (205) generates a time calibration certificate and a time detection report, and stamps a time to the trusted time stamping service system (204) to store the certificate and the report;
after step S206, step S207 is performed: and performing data statistical analysis on the equipment time information, and sending a result and early warning information to a traffic platform center (202).
6. The method of operation of a time trusted calibration system for a traffic monitoring network of claim 5, wherein: after step S206, a step S208 is performed in which the metrological certification authority issues certification certificates based on the complete tamper-free equipment time detection report and calibration report.
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| CN202011383910.4A CN112564840B (en) | 2020-12-01 | 2020-12-01 | Time credibility calibration system for traffic monitoring network and operation method thereof |
| PCT/CN2020/133512 WO2022116071A1 (en) | 2020-12-01 | 2020-12-03 | Time trusted calibration system used for traffic monitoring network and method for operation thereof |
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| CN202011383910.4A CN112564840B (en) | 2020-12-01 | 2020-12-01 | Time credibility calibration system for traffic monitoring network and operation method thereof |
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| CN113240946A (en) * | 2021-07-12 | 2021-08-10 | 天津七一二通信广播股份有限公司 | Data recording method applied to GBAS ground station |
| CN113890959A (en) * | 2021-09-10 | 2022-01-04 | 鹏城实验室 | Multi-mode image synchronous acquisition system and method |
| WO2023278447A1 (en) * | 2021-06-28 | 2023-01-05 | Ofinno, Llc | Timing resiliency service |
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| CN112564840B (en) | 2021-11-23 |
| WO2022116071A1 (en) | 2022-06-09 |
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