JP7268406B2 - Time update system, time update method and program - Google Patents

Description

The present invention relates to a time update system, time update method, and program for updating time.

A time update system is known that synchronizes time with UTC time (Coordinated Universal Time) calculated based on time information acquired from GPS (Global Positioning System) satellites. This time update system calculates UTC time based on frame signals transmitted from GPS satellites. Therefore, this time update system needs to obtain time information (GPS satellite time information) not including the integrated leap second value and another frame signal including the integrated leap second value to calculate the UTC time.

For example, the time update system can obtain time information that does not include leap second integration values from GPS satellites at one-second intervals. However, the time update system can only acquire frame signals containing leap second integration values from GPS satellites at intervals of 12.5 minutes. Therefore, the time update system has to wait for a maximum of 12.5 minutes to calculate the UTC time, and there is a problem (1) that it takes time to start operation.

In addition, the time update system requires the GPS receiver to receive and analyze the message every second in order to acquire the frame signal including the integrated leap second value, which leads to an increase in power consumption (2).

JP 2017-173129 A JP 2008-175633 A

In order to solve the above problem (1), in Japanese Unexamined Patent Application Publication No. 2002-100002, the integrated leap second value obtained from the GPS satellites is held in a storage area. As a result, when the time updating system is reset, it is possible to start operation by calculating and setting the UTC time using the integrated leap second value read from the storage area when restarting. However, when the time update system is newly installed, the information is not written in the storage area. For this reason, the time update system still has the problem that it is not possible to set an accurate UTC time that takes into account the integrated value of leap seconds.

Further, in order to solve the above problem (2), in Patent Document 2, the number of acquisition times is reduced by manipulating the timing of acquiring the integrated leap second value from the GPS satellites. However, the time update system requires the GPS receiver to receive and analyze messages every second for up to 12.5 minutes at which time the leap second accumulation value is obtained. Therefore, there remains a problem that the power consumption increases momentarily.

An object of the present disclosure is to provide a time update system, a time update method, and a program that solve any of the problems described above.

One aspect for achieving the above object is
a host device that holds an integrated leap second value obtained by accumulating leap second information and updates the integrated leap second value at a predetermined timing;
a base station that updates and sets the time based on the integrated leap second value obtained from the host device;
comprising a
This time update system is characterized by
One aspect for achieving the above object is
a step in which the host device retains an integrated leap second value obtained by integrating leap second information and updates the integrated leap second value at a predetermined timing;
a step in which the base station updates and sets the time based on the integrated leap second value obtained from the host device;
A time update method characterized by comprising:
One aspect for achieving the above object is
a process in which the host device retains an integrated leap second value obtained by integrating leap second information and updates the integrated leap second value at a predetermined timing;
a process in which the base station updates and sets the time based on the integrated leap second value obtained from the host device;
may be a program characterized by causing a computer to execute

According to the present disclosure, it is possible to provide a time update system, a time update method, and a program that solve any of the problems described above.

1 is a block diagram showing a schematic system configuration of a time update system according to one embodiment of the present invention; FIG. 2 is a block diagram showing a schematic system configuration of a host device; FIG. 1 is a block diagram showing a schematic system configuration of a base station; FIG. FIG. 10 is a sequence diagram showing operations during activation and operation of a base station; It is a flow chart which shows the flow of the time update method concerning one embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic system configuration of a time update system according to one embodiment of the present invention. A time update system 1 according to this embodiment includes a base station 2 that updates the time, and a higher-level device 3 that is higher than the base station 2 . The base station 2 and the host device 3 are connected for communication via a network or the like.

By the way, the time update system can acquire the frame signal including the integrated leap second value from the GPS satellites only at intervals of 12.5 minutes. For this reason, the time update system has to wait up to 12.5 minutes to calculate the UTC time (Coordinated Universal Time), and there is a problem that it takes time to start operation due to a new system installation or reset. Also, the time update system needs to receive and analyze the message every second at the GPS receiver at the timing of acquiring the leap second integrated value. Therefore, there is a problem that the power consumption increases momentarily.

On the other hand, the time update system 1 according to the present embodiment includes a host device 3 that holds an integrated leap second value and updates the integrated leap second value at a predetermined timing, and and a base station 2 for updating and setting the time based on the base station.

As a result, the base station 2 updates the time using the integrated leap second value acquired from the host device 3 even in a situation where the integrated leap second value cannot be acquired from the GPS satellites at the start of operation due to a system installation or reset. Can be set. Therefore, the waiting time at the start of operation as described above does not occur.

In addition, the host device 3 updates the leap second integrated value at a predetermined timing and holds the latest leap second integrated value. Therefore, since the GPS receiver 21 does not need to receive and analyze messages every second, the power consumption of the system can be reduced.

Further, the base station 2 acquires not the time itself but the integrated leap second value from the host device 3 . Since the update cycle of the integrated leap second value is slow, communication delay between the base station 2 and the host device 3 can be suppressed.

FIG. 2 is a block diagram showing a schematic system configuration of a host device. The host device 3 has a storage unit 31 that stores parameter files. The storage unit 31 is configured as OAM (Operations, Administration, Maintenance).

The parameter file contains leap second information. The leap second information is, for example, a leap second integrated value (Δt_LS) indicating an integrated value of leap seconds that have occurred up to the current time.

The host device 3 receives GPS (Global Positioning System) signals or PTP (Precision Time Protocol: IEEE) signals. The host device 3 updates the leap second integrated value (Δt_LS) of the parameter file stored in the storage unit 31 based on the GPS signal or the PTP signal. For example, the host device 3 updates the integrated leap second value (Δt_LS) of the parameter file stored in the storage unit 31 to the latest value at a predetermined timing such as the timing synchronized with the GPS signal or the PTP signal or the timing of the operation by the operator. Update.

FIG. 3 is a block diagram showing a schematic system configuration of a base station. The base station 2 has a GPS receiver 21 that receives signals from the GPS satellites 10 and an information processing section 22 that performs arithmetic processing and the like.

The GPS receiver 21 receives frame signals transmitted from the GPS satellites 10 . This frame signal is time information (hereinafter referred to as GPS satellite time information) that does not include a leap second cumulative value. The GPS receiver 21 outputs the received GPS satellite time information to the information processing section 22 .

The information processing unit 22 includes, for example, a CPU (Central Processing Unit) that performs arithmetic processing, a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory) that stores arithmetic programs executed by the CPU, an external , and an interface unit (I/F) for inputting and outputting signals, etc., and the hardware configuration is centered on a microcomputer. The CPU, memory, and interface are interconnected via a data bus or the like.

The information processing section 22 has a time setting section 23 for setting the time of the information processing section 22 . The time setting unit 23 includes a parameter file acquisition unit 24 that acquires a parameter file, a UTC time calculation unit 25 that calculates UTC time, a leap second information update unit 26 that updates the integrated leap second value (Δt_LS), and these units. and a control unit 27 for controlling the

The parameter file acquisition unit 24 acquires the leap second integrated value (Δt_LS) of the parameter file from the host device 3 when the base station 2 is activated, and holds it as internal information. The parameter file acquisition unit 24 may acquire the leap second integrated value (Δt_LS) of the parameter file from the host device 3 at predetermined intervals.

The predetermined cycle may be preset in the parameter file acquisition unit 24 by the user, for example. The parameter file acquisition unit 24 acquires the leap second integrated value (Δt_LS) of the parameter file by performing FTP (File Transfer Protocol) access or UDP (User Datagram Protocol) access to the host device 3, for example.

The leap second information updating unit 26 compares the integrated leap second value (Δt_LS) acquired by the parameter file acquiring unit 24 with the integrated leap second value (Δt_LS) inside the parameter file acquiring unit 24 . The leap second information updating unit 26 calculates the difference between the integrated leap second value acquired by the parameter file acquiring unit 24 and the integrated leap second value (Δt_LS) inside the parameter file acquiring unit 24 .

When the leap second information updating unit 26 determines that the calculated difference is equal to or greater than the predetermined value, the leap second information updating unit 26 replaces the integrated leap second value (Δt_LS) in the parameter file acquiring unit 24 with the integrated leap second acquired by the parameter file acquiring unit 24. Update to value (Δt_LS).

On the other hand, when the leap second information update unit 26 determines that the calculated difference is smaller than the predetermined value, the leap second integrated value (Δt_LS) inside the parameter file acquisition unit 24 is not updated.

The UTC time calculation unit 25 calculates the UTC time based on the GPS satellite time information output from the GPS receiver 21 and the leap second integrated value (Δt_LS) inside the parameter file acquisition unit 24 . The UTC time calculator 25 sets the calculated UTC time to the time of the base station 2 . As a result, the UTC time can be set using the latest leap second integrated value.

The control unit 27 controls the parameter file acquisition unit 24 , the UTC time calculation unit 25 and the leap second information update unit 26 .

FIG. 4 is a sequence diagram showing operations at the time of activation and operation of the base station. FIG. 5 is a flow chart showing the flow of the time update method according to this embodiment.

The control unit 27 of the time setting unit 23 controls the parameter file acquisition unit 24 so that the parameter file acquisition unit 24 acquires the leap second integrated value (Δt_LS) of the parameter file from the host device 3 at regular intervals (step S501).

When the parameter file acquisition unit 24 completes acquisition of the parameter file, the control unit 27 updates the leap second information update unit 26 with the integrated leap second value (Δt_LS) acquired by the parameter file acquisition unit 24 and the parameter file acquisition unit 24 The leap second information update unit 26 is controlled so as to compare with the internal leap second integrated value (Δt_LS) (step S502).

The leap second information updating unit 26 calculates the difference between the integrated leap second value acquired by the parameter file acquiring unit 24 and the integrated leap second value (Δt_LS) inside the parameter file acquiring unit 24 (step S503). The leap second information updating unit 26 determines whether the calculated difference is equal to or greater than a predetermined value (step S504).

When the leap second information update unit 26 determines that the calculated difference is equal to or greater than the predetermined value (YES in step S504), the leap second information update unit 26 updates the leap second integrated value (Δt_LS) inside the parameter file acquisition unit 24 by the parameter file acquisition unit 24. Update to the acquired leap second integrated value (Δt_LS) (step S505).

On the other hand, if the leap second information update unit 26 determines that the calculated difference is smaller than the predetermined value (NO in step S504), it does not update the leap second integrated value (Δt_LS) inside the parameter file acquisition unit 24 (step S506). .

The control unit 27 calculates the UTC time (agreement The UTC time calculator 25 is controlled so as to calculate the universal time (step S507). The UTC time calculator 25 sets the calculated UTC time to the time of the base station 2 (step S508).

As described above, the time update system 1 according to the present embodiment includes the host device 3 that holds an integrated leap second value and updates the integrated leap second value at a predetermined timing, and based on the integrated leap second value acquired from the host device 3, , a base station 2 for updating and setting the time. As a result, there is no waiting time at the start of operation due to system installation or resetting. In addition, since the GPS receiver 21 does not need to receive and analyze messages every second, the power consumption of the system can be reduced.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

The present invention can also be realized by, for example, causing the CPU to execute a computer program for the processing shown in FIG.

The program can be stored and delivered to the computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (eg, flexible discs, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R/W, semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)).

The program may be provided to the computer by various types of transitory computer readable medium. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable medium can deliver the program to the computer via wired channels, such as wire and fiber optics, or wireless channels.

1 Time update system 2 Base station 3 Host device 10 GPS satellite 21 GPS receiver 22 Information processing unit 23 Time setting unit 24 Parameter file acquisition unit 25 UTC time calculation unit 26 Leap second information update unit 27 Control unit 31 Storage unit

Claims (7)

Holds an integrated leap second value obtained by integrating leap second information, receives a GPS (Global Positioning System) signal or PTP (Precision Time Protocol signal), and calculates the integrated leap second value based on the received GPS signal or PTP signal a host device that updates at a predetermined timing;
a parameter file acquisition unit that acquires the integrated leap second value from the host device at regular intervals; the integrated leap second value acquired by the parameter file acquisition unit; and the integrated leap second value inside the parameter file acquisition unit; and if it is determined that the calculated difference is equal to or greater than a predetermined value, the integrated leap second value in the parameter file acquisition unit is updated to the integrated leap second value acquired by the parameter file acquisition unit. UTC for calculating the UTC time based on the leap second information update unit, the GPS satellite time information, and the leap second integrated value in the parameter file acquisition unit, and setting the calculated UTC time to the time of the base station the base station having a time calculation unit ;
comprising a
A time update system characterized by: The time update system according to claim 1,
when the base station is reset, the base station acquires the leap second integration value from the host device;
A time update system characterized by: The time update system according to claim 1 or 2,
The host device has a storage unit that stores a parameter file containing the integrated leap second value.
A time update system characterized by: The time update system according to claim 3,
The storage unit is configured as OAM (Operations, Administration and Maintenance),
A time update system characterized by: The time update system according to any one of claims 1 to 4 ,
The base station acquires the integrated leap second value by performing FTP (File Transfer Protocol) access or UDP (User Datagram Protocol) access to the higher-level device.
A time update system characterized by: A host device holds a leap second integrated value obtained by accumulating leap second information, receives a GPS (Global Positioning System) signal or a PTP (Precision Time Protocol signal), and calculates the leap second based on the received GPS signal or PTP signal a step of updating the second integrated value at a predetermined timing;
a step in which a parameter file acquisition unit of a base station acquires the integrated leap second value from the host device at regular intervals;
A leap second information update unit of the base station calculates a difference between the integrated leap second value acquired by the parameter file acquisition unit and the integrated leap second value in the parameter file acquisition unit, and the calculated difference is updating the integrated leap second value in the parameter file acquisition unit to the integrated leap second value acquired by the parameter file acquisition unit if it is determined to be equal to or greater than the predetermined value;
A UTC time calculation unit of the base station calculates UTC time based on the GPS satellite time information and the leap second integrated value in the parameter file acquisition unit, and converts the calculated UTC time to the time of the base station. a step of setting to
A time update method characterized by comprising: A host device holds a leap second integrated value obtained by accumulating leap second information, receives a GPS (Global Positioning System) signal or a PTP (Precision Time Protocol signal), and calculates the leap second based on the received GPS signal or PTP signal A process of updating the second integrated value at a predetermined timing;
A process in which the parameter file acquisition unit of the base station acquires the integrated leap second value from the host device at regular intervals;
A leap second information update unit of the base station calculates a difference between the integrated leap second value acquired by the parameter file acquisition unit and the integrated leap second value in the parameter file acquisition unit, and the calculated difference is a process of updating the integrated leap second value in the parameter file acquisition unit to the integrated leap second value acquired by the parameter file acquisition unit when it is determined that the value is equal to or greater than a predetermined value;
A UTC time calculation unit of the base station calculates UTC time based on the GPS satellite time information and the leap second integrated value in the parameter file acquisition unit, and converts the calculated UTC time to the time of the base station. and the process of setting the
A program characterized by causing a computer to execute

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