CN110971330B - Time service server system and leap second automatic adjustment method - Google Patents
Time service server system and leap second automatic adjustment method Download PDFInfo
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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
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- H—ELECTRICITY
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- H04J3/02—Details
- H04J3/06—Synchronising arrangements
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- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
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Abstract
The invention provides a time service server system and an automatic leap second adjusting method.A user can analyze UTC parameter information to obtain whether to enter a leap second prediction period or a leap second adjustment period and a leap second value under the condition of receiving the UTC parameter information and sends the leap second value to a time service client through an announce message; and under the condition that the UTC parameter information cannot be received, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second adjustment period and the leap second value to the time service client through the announce message. Therefore, compared with the existing time service server system, the method can simultaneously utilize the GNSS signal and the external clock source to perform leap second adjustment, and has higher reliability.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a time service server system and an automatic leap second adjusting method.
Background
Due to the non-uniformity and long-term slowness of the earth's rotation (mainly caused by tidal friction), when the difference between coordinated universal time (civil time) and atomic time exceeds + -0.9 seconds, the universal time is dialed forward for 1 second (negative leap seconds, last minute 59 seconds) or backward for 1 second (positive leap seconds, last minute 61 seconds); leap seconds are generally added at the end of a gregorian calendar year or at the end of june. Leap second UTCOffset is GPS-UTC, GPS is GPS time, and UTC is coordinated universal time. In IEEE-Std 1588 + 2008, it is required that a Precision Time Protocol (PTP) Time uses a Time of TAI (International Atomic Time). The relationship between TAI time and GPS time is: TAI ═ GPS +19 s. Meanwhile, IEEE-Std 1588-2008 requires that leap second and PTP _ LI-59/61 adjustments need to be completed within + -2 announce message intervals.
The existing time service server system has the problem that the leap second synchronization can only be carried out by depending on GNSS signals or external clock sources, and the reliability is poor.
Disclosure of Invention
The invention provides a time service server system and an automatic leap second adjusting method to overcome the defect of poor leap second adjusting reliability of the existing time service server system in the prior art, and the leap second adjusting reliability is improved.
The invention firstly provides a Time service server System, which comprises a GNSS (Global Navigation Satellite System) antenna, a GNSS module, a PTP (Precision Time Protocol) module and an external 1588 clock source, wherein the GNSS antenna is used for acquiring a GNSS signal and transmitting the GNSS signal to the GNSS module, the GNSS module outputs UTC (Coordinated Universal Time) parameter information to the PTP module, and the external 1588 clock source sends an announce message to the PTP module;
if the PTP module can receive the UTC parameter information, analyzing the UTC parameter information to obtain whether the leap second prediction period or the leap second adjustment period and the leap second value enter, and sending the leap second prediction period or the leap second adjustment period and the leap second value to the time service client through an announce message;
and if the PTP module cannot receive the UTC parameter information, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second value to the time service client through the announce message.
The invention also provides an automatic leap second adjusting method of the time service server system, which is used for judging whether the GNSS is in a synchronous state or not, if the GNSS signal can be acquired, the GNSS is in the synchronous state, and if the GNSS signal cannot be acquired, the GNSS is not in the synchronous state;
if the GNSS is in a synchronous state, analyzing UTC parameter information output by the GNSS module to obtain whether a leap second prediction period or a leap second adjustment period and a leap second value enter, and sending the leap second prediction period or the leap second adjustment period and the leap second value to the time service client through an announce message;
if the GNSS is in an asynchronous state, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second value to the time service client through the announce message.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: under the condition that the UTC parameter information can be received, analyzing the UTC parameter information to obtain whether the leap second prediction period or the leap second adjustment period and the leap second value enter, and sending the leap second prediction period or the leap second adjustment period and the leap second value to the time service client through an announce message; and under the condition that the UTC parameter information cannot be received, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second adjustment period and the leap second value to the time service client through the announce message. Therefore, compared with the existing time service server system, the method can simultaneously utilize the GNSS signal and the external clock source to perform leap second adjustment, and has higher reliability.
Drawings
Fig. 1 is a schematic diagram of a time service server system according to embodiment 1.
Fig. 2 is a flowchart of an embodiment 2 leap second automatic adjustment method.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, this embodiment provides a Time service server System, which includes a GNSS (Global Navigation Satellite System) antenna, a GNSS module, a PTP (Precision Time Protocol) module, and an external 1588 clock source, where the GNSS antenna is configured to acquire a GNSS signal and transmit the GNSS signal to the GNSS module, the GNSS module outputs Coordinated Universal Time (UTC) parameter information to the PTP module, and the external 1588 clock source sends an announce message to the PTP module;
if the PTP module can receive the UTC parameter information, analyzing the UTC parameter information to obtain whether the leap second prediction period or the leap second adjustment period and the leap second value enter, and sending the leap second prediction period or the leap second adjustment period and the leap second value to the time service client through an announce message;
and if the PTP module cannot receive the UTC parameter information, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second value to the time service client through the announce message.
In one embodiment, the PTP module includes an FPGA (Field-Programmable Gate Array), a CPU (Central Processing Unit), a first PHY (Physical layer of port) chip, and a second PHY chip;
the FPGA is used for receiving UTC parameter information sent by the GNSS module, and performing parameter conversion and analysis on the UTC parameter information;
the first PHY chip is used for receiving an announce message sent by an external 1588 clock source and sending the announce message to the CPU;
the CPU is used for inquiring UTC parameter information from the FPGA, judging whether the leap second prediction period or the leap second adjustment period enters or not, calculating a leap second value and generating an announce message; if the UTC parameter information cannot be inquired from the FPGA, acquiring whether the entry of the leap second adjustment period and the leap second value are obtained from an announce message sent by an external 1588 clock source from the first PHY chip, and generating an announce message;
and the second PHY chip sends the announce message generated by the CPU to the time service client.
The CPU comprises an OAM (Operation Administration and Maintenance) sub-module, wherein the OAM sub-module is used for inquiring UTC parameter information from the FPGA, the inquiry frequency is 1 time per second in a leap second prediction period, the OAM inquiry frequency is increased 30 seconds before the leap second adjustment period is started and is adjusted to be 10 times per second, and the maximum packet sending frequency of an announce message is 1 second to send 8 packets, so that the leap second adjustment requirement can be met within +/-2 announce message intervals. According to the system, different query frequencies are adopted by the leap second prediction period OAM submodule and the leap second adjustment period OAM submodule to perform leap second related information query on the FPGA submodule, the CPU load of a PTP module is reduced on the premise of meeting the requirements, and the stability of the system is improved.
The FPGA receives UTC parameter information sent by the GNSS module through a UART (Universal Asynchronous Receiver/Transmitter) interface, and the OAM sub-module inquires the UTC parameter information from the FPGA through the UART interface.
The first PHY chip is connected with an external 1588 clock source through an RJ45 interface, and the second PHY chip is connected with the time service client through an RJ45 interface.
The GNSS module is a multi-mode GNSS module and can acquire any one or more navigation satellite signals of Beidou, GPS, GLONASS and GALILEO. The GNSS module supports dual-system backup of a GPS and a BDS, the GNSS signal can be timely, accurately and stably received by the system in a GNSS synchronous state, when the GNSS signal is lost, the PTP module is rapidly switched to a backup external 1588 clock source, leap second related parameters in an announce message are analyzed, the system time is adjusted, the announce message is issued to a subordinate network element, and the system and the subordinate network element are guaranteed to perform leap second adjustment.
Example 2
As shown in fig. 2, this embodiment provides an automatic leap second adjustment method for a time service server system, which determines whether a GNSS is in a synchronous state after a device is powered on, where if a GNSS signal can be acquired, the GNSS is in the synchronous state, and if the GNSS signal cannot be acquired, the GNSS is not in the synchronous state;
if the GNSS is in a synchronous state, the following steps are specifically executed:
s1: the OAM sub-module periodically inquires UTC parameter information analyzed by the FPGA, judges whether a leap second prediction period and the positive and negative of a leap second enter, wherein the leap second prediction period is within 12 hours before the leap second adjustment of the UTC, the leap second prediction period is negative leap second when utcLSF-utcLS is less than 0, and leap59 in the announce message is set to true after the leap second prediction period enters; when utcLSF-utcLS >0, setting leap61 in the announce message to true after entering the leap second prediction period for positive leap seconds;
the judgment condition for entering the leap second prediction period is as follows:
((0＝＝abs(state.utcLeapParam.utcWNF-state.utcLeapParam.utcWNT))&&(((state.iTowNavTimeGps/1000>(state.utcLeapParam.utcDN-0.5)*24*3600+state.leapS))||((7＝＝state.utcLeapParam.utcDN)&&(state.iTowNavTimeGps/1000<state.leapS))))
wherein each parameter is defined as:
state, utcleapparam, utcwnf: UTC-week number next leap second subsequent octaves to coordinate the number of weeks of the next leap second event on world time;
UTC-reference week number, reference week number based on coordinated universal time;
state, iTowNavTimeGPS, GPS Millisecond time of Week, Millisecond time of Week;
state, utcLeapParam, utcDN, UTC-day of week while next leap second eventocure, day of week when the next leap second event occurs;
leaps, Leap Seconds (GNSS-UTC), GNSS time minus coordinated universal time, i.e., Leap Seconds;
s2: judging whether a leap second adjustment period is entered, setting PTP _ LI _59/61 in the announce message to false when the leap second adjustment period is entered, and simultaneously setting state.leaps in the UTC parameter to the origin CurrentUTCOffset parameter of the announce message;
the judgment condition for entering the leap second adjustment period is as follows:
((0＝＝abs(state.utcLeapParam.utcWNF-state.utcLeapParam.utcWNT))&&((state.iTowNavTimeGps/1000＝＝(state.utcLeapParam.utcDN)*24*3600+state.leapS))||((7＝＝state.utcLeapParam.utcDN)&&(state.iTowNavTimeGps/1000＝＝state.leapS)))。
if the GNSS is in the asynchronous state, the following steps are executed:
the PTP _ LI _59/61 and OriginCurrentUTCOffset parameters in the external 1588 clock source announce message are parsed and set to the PTP _ LI _59/61 and OriginCurrentUTCOffset parameters of the announce message.
In order to ensure that the requirements of finishing leap second and adjusting PTP _ LI _59/61 within +/-2 announce message intervals in' IEEE-Std 1588-. And the leap second related information query is carried out on the FPGA submodule by adopting different query frequencies in the leap second prediction period and the leap second adjustment period OAM submodule, the CPU load of the PTP module is reduced on the premise of meeting the requirements, and the system stability is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A time service server system is characterized by comprising a GNSS antenna, a GNSS module, a PTP module and an external 1588 clock source, wherein the GNSS antenna is used for acquiring GNSS signals and transmitting the GNSS signals to the GNSS module, the GNSS module outputs UTC parameter information to the PTP module, and the external 1588 clock source transmits an announce message to the PTP module;
if the PTP module can receive the UTC parameter information, analyzing the UTC parameter information to obtain whether the leap second prediction period or the leap second adjustment period and the leap second value enter, and sending the leap second prediction period or the leap second adjustment period and the leap second value to the time service client through an announce message;
and if the PTP module cannot receive the UTC parameter information, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second value to the time service client through the announce message.
2. The time service server system according to claim 1, wherein the PTP module includes an FPGA, a CPU, a first PHY chip, and a second PHY chip;
the FPGA is used for receiving UTC parameter information sent by the GNSS module, and performing parameter conversion and analysis on the UTC parameter information;
the first PHY chip is used for receiving an announce message sent by an external 1588 clock source and sending the announce message to the CPU;
the CPU is used for inquiring UTC parameter information from the FPGA, judging whether the leap second prediction period or the leap second adjustment period enters or not, calculating a leap second value and generating an announce message; if the UTC parameter information cannot be inquired from the FPGA, acquiring whether the entry of the leap second adjustment period and the leap second value are obtained from an announce message sent by an external 1588 clock source from the first PHY chip, and generating an announce message;
and the second PHY chip sends the announce message generated by the CPU to the time service client.
3. The time service server system of claim 2, wherein the CPU comprises an OAM sub-module configured to query UTC parameter information from the FPGA to increase OAM query frequency a number of seconds before entering the leap second adjustment period.
4. The time service server system of claim 3, wherein the FPGA receives UTC parameter information sent by the GNSS module through the UART interface, and the OAM sub-module queries the UTC parameter information from the FPGA through the UART interface.
5. The time service server system of claim 2, wherein the first PHY chip is connected to an external 1588 clock source through an RJ45 interface, and the second PHY chip is connected to the time service client through an RJ45 interface.
6. The time service server system according to any one of claims 1-5, wherein the GNSS module is a multi-mode GNSS module capable of acquiring any one or more of Beidou, GPS, GLONASS, GALILEO navigation satellite signals.
7. A leap second automatic adjustment method of a time service server system is characterized by judging whether a GNSS is in a synchronous state, if a GNSS signal can be acquired, the GNSS is in the synchronous state, and if the GNSS signal cannot be acquired, the GNSS is not in the synchronous state;
if the GNSS is in a synchronous state, analyzing UTC parameter information output by the GNSS module to obtain whether a leap second prediction period or a leap second adjustment period and a leap second value enter, and sending the leap second prediction period or the leap second adjustment period and the leap second value to the time service client through an announce message;
and if the GNSS is in an asynchronous state, analyzing an announce message sent by an external 1588 clock source to obtain whether the leap second adjustment period and the leap second value enter, and sending the leap second value to the time service client through the announce message.
8. The method for automatically adjusting leap seconds of a time service server system as claimed in claim 7, wherein if the GNSS is in a synchronous state, the following steps are executed:
s1: the OAM sub-module periodically inquires UTC parameter information analyzed by the FPGA, judges whether a leap second prediction period and the positive and negative of a leap second enter, wherein the leap second prediction period is within 12 hours before the leap second adjustment of the UTC, and sets leap59 in the announce message to true after the leap second prediction period enters; if the leap second is positive, setting leap61 in the announce message to true after the leap second prediction period is entered;
the judgment condition for entering the leap second prediction period is as follows: ((0 ═ abs (state. utcLeapapram. utcWNF-state. utcLeapapram. utcWNT)) & (((state. iTowNavTimeGps/1000> (state. utcLeapapram. utcDN-0.5). 24. 3600+ state. leaps)) | ((7 ═ state. utcLeapapram. utcDN) & & (state. iTowNavTimeGps/1000< state. leaps))))
Wherein each parameter is defined as:
state, utcleapparam, utcwnf: UTC-week number next leap second subsequent octaves to coordinate the number of weeks of the next leap second event on world time;
UTC-reference week number, reference week number based on coordinated universal time;
state, iTowNavTimeGPS, GPS Millisecond time of Week, Millisecond time of Week;
state, utcLeapParam, utcDN, UTC-day of week while next leap second eventocure, day of week when the next leap second event occurs;
leaps, Leap Seconds (GNSS-UTC), GNSS time minus coordinated universal time, i.e., Leap Seconds;
s2: judging whether a leap second adjustment period is entered, setting PTP _ LI _59/61 in the announce message to false when the leap second adjustment period is entered, and simultaneously setting state.leaps in the UTC parameter to the origin CurrentUTCOffset parameter of the announce message;
the judgment condition for entering the leap second adjustment period is as follows:
((0＝＝abs(state.utcLeapParam.utcWNF-state.utcLeapParam.utcWNT))&&((state.iTowNavTimeGps/1000＝＝(state.utcLeapParam.utcDN)*24*3600+state.leapS))||((7＝＝state.utcLeapParam.utcDN)&&(state.iTowNavTimeGps/1000＝＝state.leapS)))。
9. the method for automatically adjusting leap seconds of a time service server system as claimed in claim 7, wherein if the GNSS is in an asynchronous state, the method specifically comprises the following steps:
the PTP _ LI _59/61 and the OriginCurrentUTCOffset parameter in the external 1588 clock source announce message are parsed and set to the PTP _ LI _59/61 and OriginCurentUTCOffset parameter of the announce message.
10. The leap second auto-adjustment method for a time service server system as claimed in claim 7, wherein the OAM inquiry frequency is increased a few seconds before entering the leap second adjustment period.
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