CN117692373A - Ethernet message label transmission method and system - Google Patents
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Abstract
The invention relates to the technical field of time synchronization and provides a method and a system for transmitting Ethernet message marks. The method comprises the following steps: tracking and acquiring an information time source of external satellite navigation, and calibrating a local time reference according to the information time source; according to the calibrated local time reference, the domesticated atomic frequency standard is used as a local frequency source; collecting continuous local time information through the local frequency source, converting the local time information into a format, and then marking the format to the extracted service message data to obtain time stamp message data; and establishing an Ethernet message forwarding link, and transmitting the time stamp message data. The invention marks the hardware UTC timestamp into the network message, improves the millisecond-level timestamp marking precision to nanosecond level, and can realize the precision of the network time code message sent by the time system device as a secondary time reference when the hardware UTC timestamp is applied to an actual task, thereby improving the synchronization precision of master-slave devices.
Description
Technical Field
The present invention relates to the field of time synchronization technologies, and in particular, to a method and a system for transmitting ethernet packet labels.
Background
The time system equipment is used as secondary time reference equipment, receives and synchronizes time information output by reference equipment such as satellite navigation equipment and the like, provides network time service for the downlink user equipment through network time codes, and completes time synchronization between the time equipment and the time system equipment through the network time codes, wherein the accuracy of the synchronization depends on the marking accuracy of time stamps in the network time codes and link delay.
In general, if the network time code timestamp is marked by the operating system, because the network time code timestamp is operated at the application layer, the marking precision is in the order of milliseconds, and the link delay can reach the sub microsecond under the condition of good local area network condition, so that the synchronization precision is limited by the marking precision of the timestamp, but in recent years, as the ship electronic system is gradually huge, the number of network access devices is gradually increased year by year, the requirement on the time service precision is higher and higher, the millisecond time synchronization precision can not meet the use requirement, and the millisecond time stamp marking precision of the operating system is a main reason for influencing the time synchronization precision.
Disclosure of Invention
The present invention is directed to solving at least one of the technical problems existing in the related art. Therefore, the invention provides a method and a system for transmitting Ethernet message marks.
The invention provides a method for transmitting Ethernet message marks, which comprises the following steps:
s1: tracking and acquiring an information time source of external satellite navigation, and calibrating a local time reference according to the information time source;
s2: according to the calibrated local time reference, the domesticated atomic frequency standard is used as a local frequency source;
s3: collecting continuous local time information through the local frequency source, converting the local time information into a format, and then marking the format to the extracted service message data to obtain time stamp message data;
s4: and establishing an Ethernet message forwarding link, and transmitting the time stamp message data.
According to the method for transmitting the ethernet message label provided by the present invention, the information time source in step S1 includes a second pulse signal and a TOD signal.
According to the method for transmitting the Ethernet message mark provided by the invention, in step S2, the atomic frequency standard is tamed through the second pulse signal in the information time source.
According to the method for transmitting the Ethernet message label provided by the invention, the step S4 further comprises the following steps:
s41: driving two paths of PHY chips to establish a network port connection state, and obtaining a primary message forwarding link;
s42: performing rate negotiation on the preliminary message forwarding link to obtain an Ethernet message forwarding link;
s43: and transmitting the time stamp message data through the Ethernet message forwarding link.
The invention also provides an Ethernet message mark transmission system, which comprises:
and a time synchronization module: the method comprises the steps of tracking an information time source for acquiring external satellite navigation, calibrating a local time reference according to the information time source, and using a tamed atomic frequency standard as a local frequency source according to the calibrated local time reference;
the time synchronization module at least comprises an atomic frequency standard, the atomic frequency standard is tamed by a calibrated local time reference, and in the time interval of every two second pulse signals in the decoded information time source, the tamed atomic frequency standard is used for time keeping;
a time stamp marking module: the method comprises the steps of acquiring continuous local time information through the local frequency source, converting the local time information into a format, marking the format to the extracted service message data, and obtaining time stamp message data to finish time stamp marking of the first time of the service message data;
and a forwarding control module: and the method is used for establishing an Ethernet message forwarding link and transmitting the time stamp message data.
The invention provides an Ethernet message mark transmission system, which further comprises:
message detection module: and the message state identification is used for carrying out message state identification on the service message data extracted by the timestamp marking module according to the MAC address, the protocol version, the IP address and the port number information so as to judge whether the service message data needs timestamp marking or not.
The invention provides an Ethernet message mark transmission system, which further comprises:
and the receiving and transmitting buffer module: the data processing module is used for storing the format conversion data of the local time information, the extracted service message data and the marked time stamp message data in the time stamp marking module and also used for caching the time stamp message data which is transmitted and processed in the forwarding control module.
According to the ethernet message label transmission system provided by the present invention, the time synchronization module further includes:
a guard signal receiving unit: the information time source is used for tracking and acquiring external satellite navigation;
and (3) a controller: the system is used for decoding the information time source acquired by the guard signal receiving unit, and comparing and calibrating the decoded information time source with a local time reference.
The invention provides a method and a system for transmitting Ethernet message marks, which establish a continuous local UTC time reference system through an internal atomic frequency standard, improve the time keeping time precision in a period of time after an information source is abnormal through a tame atomic frequency standard, establish a network port message receiving and forwarding bidirectional link through a forwarding control module, thereby realizing a network message data replacing function, marking a hardware UTC time stamp into a network message by using a hardware auxiliary time stamp module, improving the millisecond time stamp marking precision to nanosecond level, and applying the millisecond time stamp marking precision to an actual task, thereby realizing that time system equipment can be used as a secondary time reference to send the precision of network time code messages so as to improve the synchronization precision of master equipment and slave equipment, and having higher application value.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for transmitting ethernet packet labels according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an ethernet packet label transmission system according to an embodiment of the present invention.
Reference numerals:
100. a time synchronization module; 110. an atomic frequency standard; 200. a time stamp marking module; 300. a forwarding control module; 400. a message detection module; 500. and a receiving and transmitting buffer module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Embodiments of the present invention are described below in conjunction with fig. 1-2.
The invention provides a method for transmitting Ethernet message marks, which comprises the following steps:
s1: tracking and acquiring an information time source of external satellite navigation, and calibrating a local time reference according to the information time source;
the information time source in step S1 includes a pulse-in-second signal and a TOD signal.
Further, firstly, the TOD signal is decoded, the validity of the time interval between the 1PPS signal and the TOD signal is judged, then the TOD time continuity is judged, the TOD time continuity is compared with the internal UTC time reference, the internal UTC time reference is corrected, and the synchronization of the internal time reference and the external 1PPS+TOD time information is completed.
S2: according to the calibrated local time reference, the domesticated atomic frequency standard is used as a local frequency source;
in step S2, the atomic frequency standard is tamed by the second pulse signal in the information time source.
Furthermore, an effective 1PPS signal is used for taming an atomic frequency standard, and frequency signals obtained by frequency multiplication of the atomic frequency standard are used for time conservation in the interval of two 1PPS signals, wherein the resolution of the UTC time reference in the interior can reach nanosecond level.
S3: collecting continuous local time information through the local frequency source, converting the local time information into a format, and then marking the format to the extracted service message data to obtain time stamp message data;
furthermore, the local UTC time reference information is marked into a specific service message after format conversion by extracting the data characteristics of the Ethernet message, and meanwhile, other message receiving and transmitting are not influenced, so that the function of marking the time stamp of the Ethernet message receiving and transmitting time with nanosecond precision is realized.
Further, according to the provided message receiving state information, in the process of receiving and transmitting the Ethernet message preamble, the UTC clock module is used as a reference mark to transmit and receive the time-on-time timestamp, the timestamp and the checksum after format conversion are stored in a cache, and whether the timestamp marking is carried out or not is judged according to the message state identification provided by the message detection module.
S4: and establishing an Ethernet message forwarding link, and transmitting the time stamp message data.
Wherein, step S4 further comprises:
s41: driving two paths of PHY chips to establish a network port connection state, and obtaining a primary message forwarding link;
s42: performing rate negotiation on the preliminary message forwarding link to obtain an Ethernet message forwarding link;
s43: and transmitting the time stamp message data through the Ethernet message forwarding link.
Furthermore, the time stamp marking function is not started in the initial state, and the two paths of PHY chips are driven to complete network port connection state establishment and rate negotiation, so that a stable Ethernet message forwarding link is formed;
secondly, after the atomic frequency standard works stably, outputting a frequency signal for transmission;
thirdly, judging the locking state of the atomic frequency standard and the phase-locked loop, decoding an external 1PPS second pulse signal and a TOD signal after locking, comprehensively judging TOD signal continuity, TOD information and internal UTC time deviation consistency and 1PPS signal and TOD signal time interval, then completing UTC time synchronization, using a guard 1PPS signal to tame the atomic frequency standard, and providing a continuous time reference for hardware-assisted time stamp marking when the external 1PPS signal and the TOD signal are out of work or jump and finish time keeping according to the frequency signal;
and finally, judging the validity of the Ethernet message forwarding link state and the internal UTC time reference, starting a time stamp marking function after the states are normal, and ending the flow.
The invention also provides an Ethernet message mark transmission system, which comprises:
time synchronization module 100: the method comprises the steps of tracking an information time source for acquiring external satellite navigation, calibrating a local time reference according to the information time source, and using a tamed atomic frequency standard as a local frequency source according to the calibrated local time reference;
the time synchronization module 100 at least comprises an atomic frequency standard 110, the atomic frequency standard 110 is tamed by a calibrated local time reference, and in the time interval of every two second pulse signals in the decoded information time source, the tamed atomic frequency standard 110 is used for time keeping;
wherein, the time synchronization module 100 further comprises:
a guard signal receiving unit: the information time source is used for tracking and acquiring external satellite navigation;
and (3) a controller: the system is used for decoding the information time source acquired by the guard signal receiving unit, and comparing and calibrating the decoded information time source with a local time reference.
Further, the time synchronization module is composed of an atomic frequency standard, a satellite navigation signal receiving circuit, a frequency multiplication circuit and a controller, wherein the controller comprises, but is not limited to, a singlechip and CPU, DSP, FPGA: the working flow is that after the receiving circuit finishes level conversion, a guard 1PPS signal and a TOD signal are sent to a controller, the controller firstly decodes the TOD signal and judges the validity of time interval determination information between the 1PPS signal and the TOD signal, then judges TOD time continuity and compares the TOD time continuity with an internal UTC time reference time, corrects the internal UTC time reference, completes synchronization of the internal time reference and external 1PPS+TOD time information, simultaneously uses an effective 1PPS signal to tame an atomic frequency standard, and uses a frequency signal obtained by frequency multiplication of the atomic frequency standard to carry out time conservation in the 1PPS signal interval twice, and the resolution of the UTC time reference in the controller can reach nanosecond level.
Timestamp marking module 200: the method comprises the steps of acquiring continuous local time information through the local frequency source, converting the local time information into a format, marking the format to the extracted service message data, and obtaining time stamp message data to finish time stamp marking of the first time of the service message data;
further, the hardware-assisted time stamping module, the workflow is: and according to the message receiving state information provided by the forwarding control module, in the process of receiving and transmitting the Ethernet message preamble, taking the UTC clock module as a reference mark to transmit and receive the time on time timestamp, storing the timestamp and the checksum after format conversion into a cache, and judging whether to carry out timestamp marking according to the message state identification provided by the message detection module.
Forwarding control module 300: and the method is used for establishing an Ethernet message forwarding link and transmitting the time stamp message data.
Further, the forwarding control module, the workflow is: and the two paths of Ethernet interface PHY chips are controlled by a drive, so that the receiving and forwarding of the two network port data are realized, the hardware drive and the software operating system are linked, and the hardware auxiliary time stamp marking module is used for controlling the forwarding process, so that the accurate time stamp marking of the receiving and transmitting time is realized.
Wherein, still include:
message detection module 400: and the message state identification module is used for carrying out message state identification on the service message data extracted by the timestamp marking module 200 according to the MAC address, the protocol version, the IP address and the port number information so as to judge whether the service message data needs timestamp marking or not.
Wherein, still include:
the transceiver buffer module 500: the data storage module is configured to store format conversion data of the local time information, extracted service message data, and marked time stamp message data in the time stamp marking module 200, and also is configured to buffer time stamp message data processed by transmission in the forwarding control module 300.
Furthermore, the receiving and transmitting buffer module is realized by an internal register of a processor, including but not limited to a singlechip and CPU, DSP, FPGA, and is applied to network message data recording of a forwarding control module and timestamp format conversion, checksum calculation and data storage of a hardware-assisted timestamp marking module.
In some embodiments, the hardware part includes an input-output network interface, an interface circuit, a controller and an atomic frequency standard, and processing logic in the controller and external hardware form a time synchronization module (UTC clock module), a message detection module, a hardware-assisted time stamp marking module, a forwarding control module, and a receiving/transmitting buffer function module.
The forwarding control module comprises an input/output network interface driver, and the controller finishes the forwarding and the forwarding of the message between the input/output network interfaces based on the driver; the interface circuit is a pure hardware circuit and is responsible for converting the external guard signal from the RS422 level to the TTL level and inputting the TTL level to the controller; the UTC clock module consists of a phase-locked loop and time information processing logic in the controller, and realizes external time synchronization, time keeping and atomic frequency standard taming; the message detection module consists of internal time sequence and combinational logic of the controller and is used for outputting message detection identification signals and partial message information; the hardware auxiliary time stamp marking module consists of internal time sequence and combination logic of the controller, and controls the time stamp marking process according to the information of the forwarding control module and the message detection module; the receive/transmit buffer is a controller internal register.
The method can finally realize the function expansion of marking the time stamp of any network message by matching the five functional modules, and the marking precision can reach nanosecond level.
When the device is in operation, firstly, 1PPS signals are input into the controller after level conversion, the controller generates a path of second pulse signals with the same phase as the internal frequency by using the internal D trigger, the working frequency of the D trigger is 125MHz clock signals obtained after frequency multiplication of an atomic frequency standard, the phase uncertainty of the internal 1PPS signals and the external 1PPS signals is not more than 8ns, and the internal time register is calibrated by taking the rising edge of the synchronized 1PPS signals as a reference.
The 10MHz standard frequency signal output by the atomic frequency standard enters the controller, the frequency is doubled to 125M by the phase-locked loop in the controller, and the time register in the controller finishes time keeping by the frequency signal.
After the controller finishes the time information judgment, the input 1PPS signal is forwarded to an atomic frequency standard for adjusting physical system parameters in the atomic frequency standard, and the atomic frequency standard is continuously tamed.
The forwarding control module provides the input message including message type, receiving state, message length, port number, header check, protocol version, serial ID, data segment check and other information to the message detection module, the message detection module compares the received data with the preset message header to form the identification information according to the Ethernet message receiving stage, the hardware auxiliary time stamp marking module completes the works of time stamp format conversion, check and correction and the like according to the message receiving stage and the identification information, and stores the effective data into the receiving/transmitting buffer, and the output end forwarding control module transmits the message in the buffer outwards, so as to complete the hardware time stamp marking;
and if the message receiving link marks the receiving time timestamp into the inward message according to the same logic work, the operating system end can acquire the accurate message receiving time.
The hardware timestamp marking software process is an open loop process, and the device cannot complete initialization when the external condition is not satisfied, for example: the method has the advantages that the external time synchronization is not performed once effectively, the coordination of any network interface fails or the connection is abnormal, the atomic frequency standard system is abnormal, the phase-locked loop in the controller cannot be locked, the uninitialized device can only complete the transfer and forwarding functions of the basic network message under the normal network port connection state, the hardware timestamp marking cannot be realized, and the device continuously carries out the hardware timestamp marking on the receiving and transmitting message after the system initialization is completed.
The invention provides a method and a system for transmitting Ethernet message marks, which comprise a UTC clock module, a message detection module, a hardware-assisted time stamp marking module, a forwarding control module and a receiving/sending buffer. The UTC clock module judges and tracks an external satellite navigation information time source, calibrates a local UTC time reference and disciplines a local frequency source, and provides continuous and accurate UTC time information to the hardware auxiliary time stamp marking module; the message detection module recognizes a message to be marked according to preset header characteristic information and provides a state identifier for the hardware auxiliary time stamp marking module; the hardware auxiliary time stamp marking module completes the time information format conversion, and according to the message state identification, the time stamp information, the correction checksum are stored into a receiving/transmitting buffer memory according to the message format; the forwarding control module is responsible for completing message receiving and sending control, repackaging and checking the message by using the information provided by the hardware auxiliary time stamp marking module, and filling the accurate time stamp into the message in the forwarding process; the receiving/sending buffer is used for storing data such as message content. The high-precision Ethernet message time marking device constructed by the invention does not need special hardware or operation system support, and can realize the function expansion of time marking of any network message by a hardware scheme, and the marking precision can reach nanosecond level.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The Ethernet message mark transmission method is characterized by comprising the following steps:
s1: tracking and acquiring an information time source of external satellite navigation, and calibrating a local time reference according to the information time source;
s2: according to the calibrated local time reference, the domesticated atomic frequency standard is used as a local frequency source;
s3: collecting continuous local time information through the local frequency source, converting the local time information into a format, and then marking the format to the extracted service message data to obtain time stamp message data;
s4: and establishing an Ethernet message forwarding link, and transmitting the time stamp message data.
2. The method according to claim 1, wherein the information time source in step S1 includes a pulse-per-second signal and a TOD signal.
3. The method according to claim 2, wherein in step S2, the atomic frequency standard is tamed by the second pulse signal in the information time source.
4. The method for transmitting ethernet message labels according to claim 1, wherein step S4 further comprises:
s41: driving two paths of PHY chips to establish a network port connection state, and obtaining a primary message forwarding link;
s42: performing rate negotiation on the preliminary message forwarding link to obtain an Ethernet message forwarding link;
s43: and transmitting the time stamp message data through the Ethernet message forwarding link.
5. An ethernet message label transmission system, comprising:
and a time synchronization module: the method comprises the steps of tracking an information time source for acquiring external satellite navigation, calibrating a local time reference according to the information time source, and using a tamed atomic frequency standard as a local frequency source according to the calibrated local time reference;
the time synchronization module at least comprises an atomic frequency standard, the atomic frequency standard is tamed by a calibrated local time reference, and in the time interval of every two second pulse signals in the decoded information time source, the tamed atomic frequency standard is used for time keeping;
a time stamp marking module: the method comprises the steps of acquiring continuous local time information through the local frequency source, converting the local time information into a format, marking the format to the extracted service message data, and obtaining time stamp message data to finish time stamp marking of the first time of the service message data;
and a forwarding control module: and the method is used for establishing an Ethernet message forwarding link and transmitting the time stamp message data.
6. The ethernet message tag transmission system of claim 5, further comprising:
message detection module: and the message state identification is used for carrying out message state identification on the service message data extracted by the timestamp marking module according to the MAC address, the protocol version, the IP address and the port number information so as to judge whether the service message data needs timestamp marking or not.
7. The ethernet message tag transmission system of claim 5, further comprising:
and the receiving and transmitting buffer module: the data processing module is used for storing the format conversion data of the local time information, the extracted service message data and the marked time stamp message data in the time stamp marking module and also used for caching the time stamp message data which is transmitted and processed in the forwarding control module.
8. The ethernet packet label transmission system according to claim 6, wherein said time synchronization module further comprises:
a guard signal receiving unit: the information time source is used for tracking and acquiring external satellite navigation;
and (3) a controller: the system is used for decoding the information time source acquired by the guard signal receiving unit, and comparing and calibrating the decoded information time source with a local time reference.
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| CN114629586A (en) * | 2022-03-14 | 2022-06-14 | 中国船舶重工集团公司第七0七研究所 | Network port PTP time service function extension device and extension method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10257798B1 (en) * | 2018-05-18 | 2019-04-09 | OPNT Holding B.V. | Synchronizing clocks in a wireless system |
| CN109687868A (en) * | 2018-12-28 | 2019-04-26 | 武汉依迅电子信息技术有限公司 | The method for synchronizing time and device of more reference sources |
| CN111431655A (en) * | 2020-03-30 | 2020-07-17 | 中国电子科技集团公司第五十四研究所 | High-precision XPPS time delay consistency implementation method |
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