CN109839816B - Timing method and device for local time - Google Patents
Timing method and device for local time Download PDFInfo
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- CN109839816B CN109839816B CN201711204142.XA CN201711204142A CN109839816B CN 109839816 B CN109839816 B CN 109839816B CN 201711204142 A CN201711204142 A CN 201711204142A CN 109839816 B CN109839816 B CN 109839816B
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Abstract
The invention provides a method and a device for timing local time, wherein the method comprises the following steps: the method comprises the steps that a server obtains time service time of two time points and crystal oscillator numbers of the server of the two time points; and determining whether to correct the local time of the server through the time service time or not according to the time service time of the two time points and the number of the server crystal oscillators of the two time points. The invention does not depend on the local time of the server, but determines whether to correct the local time of the server through the time service time according to the time service time of the two time points and the crystal oscillator number of the server of the two time points, instead of fixedly adopting a local clock or a time service clock, so that when the local time of the server is artificially changed and the time service time is effective, the local time can be corrected through the external time service time (the crystal oscillator counting is very difficult to change), thereby realizing the bidirectional stability of a clock system of the server.
Description
Technical Field
The invention relates to the technical field of computer processing, in particular to a method and a device for timing local time.
Background
An automatic train monitoring system (hereinafter referred to as the system) for urban rail transit is a distributed system with high automation degree, as the distributed system, a great amount of information is transmitted between each component and each assembly, and the logical relationship among the information is closely related to the time sequence, so that a unified system clock is a very important component of the system. Once the system clock jumps, the system is switched to manual operation, so that the monitoring efficiency is reduced sharply.
The server local clock is a source of a system clock, and the server local clock has certain probability jump due to the existence of factors of server crystal oscillator error accumulation and manual change of the server local clock.
The time service clock using the GPS/Beidou/Glonass positioning satellite is another system clock source, and the time precision is very high. In practical application, however, satellite signals are transmitted into the system from a receiving station through a network, and after a series of data transmission and change, the time service clock has a certain possibility of jumping, such as changes in hours and dates, and many wireless signal sources can generate interference to positioning satellite signals, so that the possibility of jumping of the time service clock is increased.
The working principle of other existing protection technologies is that when the difference between a time service clock and a local clock is large, a system clock is only corrected by the local clock, and the time service clock is not used for correcting the time.
Disclosure of Invention
The present invention provides a method and apparatus for timing local time that at least partially solves the above-mentioned problems.
In a first aspect, the present invention provides a method for timing local time, including:
the method comprises the steps that a server obtains time service time of two time points and crystal oscillator numbers of the server of the two time points;
and determining whether to correct the local time of the server through the time service time or not according to the time service time of the two time points and the number of the server crystal oscillators of the two time points.
Preferably, the determining whether to correct the local time of the server by the time service time according to the time service times at the two time points and the number of the server crystal oscillators at the two time points includes:
judging whether the time service time of the two time points is equal to obtain a judgment result;
calculating a crystal oscillator count value between the two time points according to the number of the server crystal oscillators at the two time points;
calculating the time service time difference obtained by subtracting the time service time of the previous time point from the next time point in the two time points according to the time service time of the two time points;
and determining whether to time the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference.
Preferably, the determining whether to correct the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference includes:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, and if the crystal oscillator count value and the time service time difference meet a formula (one), determining to perform time correction on local time through the time service time
Δ t1/nps- Δ t2< Tth (one)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
Preferably, the determining whether to correct the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference includes:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is less than the number of the server crystal oscillators at the previous time point, determining to correct the local time through the time service time if the crystal oscillator count value and the time service time difference meet a formula (II)
(. DELTA.t 1+ Tmax)/nps-. DELTA.t 2< Tth (two)
Wherein, Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, Tmax is a maximum program count value, nps is a crystal oscillator number per second, and Tth is a double difference threshold.
Preferably, the determining whether to correct the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference includes:
if the judgment result shows that the time service times of the two time points are equal, or the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, if the difference between the crystal oscillator count value and the time service time meets the formula (III), determining that the local time is not corrected by the time service time
Δ t1/nps- Δ t2 ≧ Tth (III)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
Preferably, the determining whether to correct the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference includes:
if the judgment result shows that the time service times of the two time points are equal, or the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is smaller than the number of the server crystal oscillators at the previous time point, if the crystal oscillator count value and the time service time difference satisfy the formula (IV), determining that the local time is not corrected by the time service time
Wherein, Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, Tmax is a maximum program count value, nps is a crystal oscillator number per second, and Tth is a double difference threshold.
Preferably, the difference between the two time points is less than or equal to 5 hours.
In a second aspect, the present invention further provides a local time calibrating apparatus, including:
the acquisition unit is used for acquiring the time service time of two time points and the crystal oscillator number of the server of the two time points by the server;
and the determining unit is used for determining whether to correct the local time of the server through the time service time according to the time service time of the two time points and the number of the server crystal oscillators of the two time points.
Preferably, the determining unit is further configured to:
judging whether the time service time of the two time points is equal to obtain a judgment result;
calculating a crystal oscillator count value between the two time points according to the number of the server crystal oscillators at the two time points;
calculating the time service time difference obtained by subtracting the time service time of the previous time point from the next time point in the two time points according to the time service time of the two time points;
and determining whether to time the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference.
Preferably, the determining unit is further configured to:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, and if the crystal oscillator count value and the time service time difference meet a formula (one), determining to perform time correction on local time through the time service time
Δ t1/nps- Δ t2< Tth (one)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
According to the technical scheme, whether the server local time is corrected through the time service time is determined according to the time service time of the two time points and the number of the server crystal oscillators of the two time points instead of fixedly adopting the local clock or the time service clock, so that when the server local time is manually changed and the time service time is effective, the local time can be corrected through the external time service time (the crystal oscillator is difficult to count), and the bidirectional stability of the server clock system is realized.
Drawings
Fig. 1 is a flowchart of a local time timing method according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a local time timing apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a local time timing method according to an embodiment of the present invention.
A method for timing local time as shown in fig. 1 includes:
s101, a server acquires time service time of two time points and crystal oscillator number of the server of the two time points;
in one embodiment, the difference between the two time points is less than or equal to 5 hours.
It should be noted that the server periodically obtains the time service time of the external time service clock, the period of obtaining the time service time does not affect the validity of the determination, and the error of the crystal oscillator accumulation does not exceed the double difference threshold Tth within 5 hours, because the error accumulation of the server crystal oscillator can reach 15 seconds or more per month, but the crystal oscillator count can be regarded as a stable timer within a short time (generally within 5 hours).
And S102, determining whether to correct the local time of the server through the time service time or not according to the time service time of the two time points and the crystal oscillator number of the server at the two time points.
It can be understood that the number of the server crystal oscillators is obtained mainly for counting the local time of the server.
According to the embodiment, whether the server local time is corrected through the time service time is determined according to the time service time of the two time points and the number of the server crystal oscillators of the two time points without depending on the server local time, instead of fixedly adopting a local clock or a time service clock, so that when the server local time is artificially changed and the time service time is effective, the local time can be corrected through the external time service time (the crystal oscillator counting is very difficult to change), and the bidirectional stability of a server clock system is realized.
The embodiment avoids system time errors caused by only adopting the credit time service; compared with other protection technologies, the method avoids the failure of the time service clock caused by the jump of the local clock of the server, and reduces the human intervention, thereby realizing the intelligent time correction of using another clock when any clock of the system fails.
The method and the device can avoid system time errors caused by manual negligence or failure of other protection technologies, thereby reducing the probability of the system switching to manual control and simultaneously reducing the labor intensity of manual protection of the system clock.
The technology further strengthens the automation intelligence degree of the system, and is already used for actual engineering projects to achieve expected effects.
As a preferred embodiment, the step S102 includes:
judging whether the time service time of the two time points is equal to obtain a judgment result;
calculating a crystal oscillator count value between the two time points according to the number of the server crystal oscillators at the two time points;
calculating the time service time difference obtained by subtracting the time service time of the previous time point from the next time point in the two time points according to the time service time of the two time points;
and determining whether to time the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference.
As a preferred embodiment, determining whether to correct the local time of the server by the time service time according to the determination result, the crystal oscillator count value, and the time service time difference includes:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, and if the crystal oscillator count value and the time service time difference meet a formula (one), determining to perform time correction on local time through the time service time
Δ t1/nps- Δ t2< Tth (one)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
And because the server crystal oscillator count has periodicity, if the period exceeds one period, namely reaching a period when the program count maximum value is reached, restarting counting from the beginning, and based on the counting, determining whether to correct the server local time by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference, comprising the following steps:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is less than the number of the server crystal oscillators at the previous time point, determining to correct the local time through the time service time if the crystal oscillator count value and the time service time difference meet a formula (II)
(. DELTA.t 1+ Tmax)/nps-. DELTA.t 2< Tth (two)
Wherein, Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, Tmax is a maximum program count value, nps is a crystal oscillator number per second, and Tth is a double difference threshold.
The above two embodiments illustrate that the time service clock does not transition.
As a preferred embodiment, determining whether to correct the local time of the server by the time service time according to the determination result, the crystal oscillator count value, and the time service time difference includes:
if the judgment result shows that the time service times of the two time points are equal, or the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, if the difference between the crystal oscillator count value and the time service time meets the formula (III), determining that the local time is not corrected by the time service time
Δ t1/nps- Δ t2 ≧ Tth (III)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
Or, according to the judgment result, the crystal oscillator count value and the time service time difference, determining whether to correct the local time of the server by the time service time, including:
if the judgment result shows that the time service times of the two time points are equal, or the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is smaller than the number of the server crystal oscillators at the previous time point, if the crystal oscillator count value and the time service time difference satisfy the formula (IV), determining that the local time is not corrected by the time service time
Wherein, Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, Tmax is a maximum program count value, nps is a crystal oscillator number per second, and Tth is a double difference threshold.
It should be noted that the local time is not corrected by the time service time, that is, the local time is used as the system time of the server.
The above two embodiments illustrate the transition of the time service clock.
Fig. 2 is a schematic block diagram of a local time timing apparatus according to another embodiment of the present invention.
A local time timing apparatus as shown in fig. 2, comprising:
an obtaining unit 201, configured to obtain time service times at two time points and crystal oscillator numbers of the server at the two time points by a server;
and the determining unit 202 is configured to determine whether to correct the local time of the server by the time service time according to the time service times at the two time points and the number of the server crystal oscillators at the two time points.
As a preferred embodiment, the determining unit 202 is further configured to:
judging whether the time service time of the two time points is equal to obtain a judgment result;
calculating a crystal oscillator count value between the two time points according to the number of the server crystal oscillators at the two time points;
calculating the time service time difference obtained by subtracting the time service time of the previous time point from the next time point in the two time points according to the time service time of the two time points;
and determining whether to time the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference.
As a preferred embodiment, the determining unit 202 is further configured to:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, and if the crystal oscillator count value and the time service time difference meet a formula (one), determining to perform time correction on local time through the time service time
Δ t1/nps- Δ t2< Tth (one)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
It should be noted that, in the respective components of the apparatus of the present invention, the components therein are logically divided according to the functions to be implemented, but the present invention is not limited thereto, and the respective components may be re-divided or combined as needed, for example, some components may be combined into a single component, or some components may be further decomposed into more sub-components.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in an apparatus according to an embodiment of the invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above embodiments are only suitable for illustrating the present invention and not limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (8)
1. A method for timing local time, comprising:
the method comprises the steps that a server obtains time service time of two time points and crystal oscillator numbers of the server of the two time points;
determining whether the local time of the server is calibrated through the time service time or not according to the time service time of the two time points and the number of the server crystal oscillators of the two time points;
determining whether to correct the local time of the server through the time service time according to the time service time of the two time points and the number of the server crystal oscillators of the two time points, and the method comprises the following steps:
judging whether the time service time of the two time points is equal to obtain a judgment result;
calculating a crystal oscillator count value between the two time points according to the number of the server crystal oscillators at the two time points;
calculating the time service time difference obtained by subtracting the time service time of the previous time point from the next time point in the two time points according to the time service time of the two time points;
and determining whether to time the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference.
2. The method according to claim 1, wherein determining whether to time the local time of the server according to the time service time according to the judgment result, the crystal oscillator count value and the time service time difference comprises:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, and if the crystal oscillator count value and the time service time difference meet a formula (one), determining to perform time correction on local time through the time service time
Δ t1/nps- Δ t2< Tth (one)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
3. The method according to claim 1, wherein determining whether to time the local time of the server according to the time service time according to the judgment result, the crystal oscillator count value and the time service time difference comprises:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is less than the number of the server crystal oscillators at the previous time point, determining to correct the local time through the time service time if the crystal oscillator count value and the time service time difference meet a formula (II)
(. DELTA.t 1+ Tmax)/nps-. DELTA.t 2< Tth (two)
Wherein, Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, Tmax is a maximum program count value, nps is a crystal oscillator number per second, and Tth is a double difference threshold.
4. The method according to claim 1, wherein determining whether to time the local time of the server according to the time service time according to the judgment result, the crystal oscillator count value and the time service time difference comprises:
if the judgment result shows that the time service times of the two time points are equal, or the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, if the difference between the crystal oscillator count value and the time service time meets the formula (III), determining that the local time is not corrected by the time service time
Δ t1/nps- Δ t2 ≧ Tth (III)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
5. The method according to claim 1, wherein determining whether to time the local time of the server according to the time service time according to the judgment result, the crystal oscillator count value and the time service time difference comprises:
if the judgment result shows that the time service times of the two time points are equal, or the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is smaller than the number of the server crystal oscillators at the previous time point, if the crystal oscillator count value and the time service time difference satisfy the formula (IV), determining that the local time is not corrected by the time service time
Wherein, Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, Tmax is a maximum program count value, nps is a crystal oscillator number per second, and Tth is a double difference threshold.
6. The method of claim 1, wherein the difference between the two time points is less than or equal to 5 hours.
7. A timing device for local time, comprising:
the acquisition unit is used for acquiring the time service time of two time points and the crystal oscillator number of the server of the two time points by the server;
the determining unit is used for determining whether to correct the local time of the server through the time service time according to the time service time of the two time points and the number of the server crystal oscillators of the two time points;
the determining unit is further configured to:
judging whether the time service time of the two time points is equal to obtain a judgment result;
calculating a crystal oscillator count value between the two time points according to the number of the server crystal oscillators at the two time points;
calculating the time service time difference obtained by subtracting the time service time of the previous time point from the next time point in the two time points according to the time service time of the two time points;
and determining whether to time the local time of the server by the time service time according to the judgment result, the crystal oscillator count value and the time service time difference.
8. The apparatus of claim 7, wherein the determining unit is further configured to:
if the judgment result shows that the time service times of the two time points are not equal, if the number of the server crystal oscillators at the later time point in the number of the server crystal oscillators at the two time points is greater than or equal to the number of the server crystal oscillators at the previous time point, and if the crystal oscillator count value and the time service time difference meet a formula (one), determining to perform time correction on local time through the time service time
Δ t1/nps- Δ t2< Tth (one)
Where Δ t1 is a crystal oscillator count value, Δ t2 is a time difference, nps is a crystal oscillator count per second, and Tth is a double difference threshold.
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