JP2001228271A - Clock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clock device which semi-permanently provides accurate UTC time and local time including year, month, and date. SOLUTION: A signal receiving part 2 performs synchronous control with GPS signal for acquiring information, and a leap-second information is stored in a leap-second information control part 4. At a GPS time calculation part 3, average propagation time and process delay is corrected and the clock error for each satellite is corrected to provide an accurate GPS time. With a reference date set to 1980/1/6 with a week number set to 0-week at a reference date control part 5, a time system conversion part 6 usually assumes GPS time to be within 1024 weeks since 1980/1/6 and converts it to year/month/day/hour/ minute/second format. However, a medium reading part 10 is added so that a reference date information is read from a convertible medium in which the reference date information is recorded and then a reference date is written into the reference date control part 5. If the reference date is assumed to be 1999/8/20, the time series conversion part 6 assumes the GPs time to be within 1024 weeks since 1999/8/20 and converts it into year/month/day/hour/minute/ second format.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clock device for receiving a signal from a GPS satellite to determine a date and time, and more particularly, it can semi-permanently determine an accurate UTC time including a date and a local time. The configuration is as follows.

[0002]

2. Description of the Related Art Conventionally, as a timepiece device, Japanese Patent Application Laid-Open No. H10-102
The one disclosed in Japanese Patent Publication No. 51 is cited as an example. FIG. 10 shows a configuration of a conventional timepiece device.

[0003] The conventional timepiece shown in FIG.
An antenna 1 for receiving a radio wave from the S satellite, a signal receiving unit 2 for performing synchronization control on a signal and demodulating data,
A GPS time calculating unit 3 for extracting PS time data and calculating a time in a GPS time system;
TC), a leap second information management unit 4 that extracts and stores leap second information, which is a difference from TC, a reference date management unit 26 that stores a reference date for associating GPS time with UTC time, and GPS.
A time system conversion unit 6 for converting time to UTC time;
Time difference information management unit 7 that stores time difference information between the C time and the local time of the region to be used, and a clock unit 8 that converts the UTC time and the time difference information into local time and measures time.
And a display unit 9 for displaying the date and time of the local time.

[0004] From a GPS satellite, the UTC time is 1980
At 00:00:02 on the 6th of the month, the week number is 0, the time from the beginning of the week is 0, GPS time information measured with the same 1-second length as UTC time, satellite clock error information, GPS
Leap second information indicating the difference between the time and the UTC time is transmitted. If a signal from a GPS satellite is received on the ground, 60
A propagation time of about 80 ms and a processing delay of about several tens of ms are required. However, if the average propagation time and processing delay are corrected, the GPS time can be obtained with an accuracy of about 20 ms. Furthermore, if three or more satellites are received and the positioning error is calculated after correcting the clock error of each satellite, the propagation time of each satellite can also be measured accurately, so that the GPS time can be calculated with an accuracy of about several hundred ns. You can ask.

[0005] A GPS number represented by a week number and a time from the beginning of the week with reference to 00:00:00 on January 6, 1980,
If the time is converted to the format of year, month, day, hour, minute, and second and the leap second information representing the difference between the GPS time and the UTC time is corrected, the UTC time is obtained. If the time difference information of the local time of the area to be used is corrected, the local time is corrected. You can find the time.

As described above, even in the above-mentioned conventional timepiece device, the GP
Accurate UT including the date using the signal from S satellite
C time and local time can be obtained.

[0007]

However, in the above conventional timepiece device, since the GPS reference date is fixed at January 6, 1980, the GPS time returns to week 0 again after August 22, 1999. There was a problem that the correct date was not required.

It is an object of the present invention to provide a clock device capable of semi-permanently obtaining accurate UTC time and local time including the date.

[0009]

According to the first aspect of the present invention, the reference date can be updated by reading the reference date information from a replaceable medium on which the reference date information is recorded.

According to the present invention, a correct date can be semipermanently obtained by inserting a replaceable medium on which a new reference date is recorded once every ten years.

According to a second aspect of the present invention, in the first aspect of the present invention, information on a time difference between the UTC time and the local time of an area to be used is recorded on a replaceable medium.

According to the present invention, the time difference information can be automatically updated by inserting the medium for the area to be used, and the local time is obtained.

According to a third aspect of the present invention, in the first aspect of the present invention, a screen input unit is provided so that a reference date can be input from the screen.

According to the present invention, if a new reference date is set once every ten years, a correct date can be obtained semipermanently.

According to a fourth aspect of the present invention, in the third aspect of the present invention, when the current date and time are set on the screen, the reference date is automatically updated.

According to the present invention, if the current date and time are set once every ten years, a correct date can be obtained semipermanently.

According to a fifth aspect of the present invention, in the fourth aspect, the time difference information can be set from the screen input unit.

According to the present invention, the time difference information of the region to be used can be updated, so that the correct local time can be obtained not only when the region to be used changes, but also when the time difference changes due to daylight saving time.

The invention of claim 6 is the invention of claims 3 to 5
In the invention according to any one of the above, an Internet access unit is provided, and the reference date and the time difference are updated when accessing a homepage from which date and time difference information can be obtained.

According to the present invention, each time a homepage from which date and time difference information can be obtained is accessed, it can be updated to the latest reference date and time difference, and the correct date and local time can be obtained.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, a homepage from which date and time difference information can be automatically acquired when a difference between the reference date and the date of the clock section is equal to or more than a certain value is provided. In this case, the time difference information and the reference date are updated.

According to the present invention, the latest reference date and the time difference can be automatically updated, and the correct date and local time can be obtained.

According to an eighth aspect of the present invention, in the fourth aspect of the present invention, the reference date is automatically updated when a difference between the reference date and the date of the clock section becomes equal to or more than a predetermined value. .

According to the present invention, the latest reference date can be automatically updated, and the correct date can be obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(First Embodiment) FIG. 1 is a block diagram showing a configuration of a timepiece device according to a first embodiment of the present invention. In FIG. 1, a clock device includes an antenna 1 for receiving a radio wave from a GPS satellite, a signal receiving unit 2 for performing synchronization control on a signal to demodulate data, and extracting GPS time data to set a time in a GPS time system. A GPS time calculating unit 3 for calculating; a leap second information managing unit 4 for extracting and storing leap second information which is a difference between GPS time and Coordinated Universal Time (UTC);
A reference date management unit 5 for holding a reference date for associating the GPS time with the UTC time;
A time system conversion unit 6 for converting time to time; a time difference information management unit 7 for holding time difference information between UTC time and local time in a region to be used; and a clock for converting UTC time and time difference information to local time and measuring time Unit 8, a display unit 9 for displaying the date, month, day, hour, minute, and second of the local time, and a media reading unit 10 for reading the reference date information from the replaceable medium on which the reference date information is recorded and writing the information to the reference date management unit. It is composed of

[0027] From the GPS satellite, the UTC time, 1980 1
At 00:00:02 on the 6th of the month, the week number is 0, the time from the beginning of the week is 0, GPS time information measured with the same 1-second length as UTC time, satellite clock error information, GPS
Leap second information indicating the difference between the time and the UTC time is transmitted.

The signal from the GPS satellite received by the antenna 1 is controlled synchronously with the signal by the signal receiving unit 2 to acquire such information, and the leap second information is stored in the leap second information managing unit 4.
Save to In the GPS time calculation unit 3, the acquired GPS
For the time information, the clock error of each satellite is corrected and the average propagation time and processing delay are corrected.
An accurate GPS time is obtained by performing positioning calculation by receiving satellites or more.

As shown in FIG. 9, the GPS time is expressed in the form of a week number and a time from the beginning of the week, and the week number and the week number are set at 00:00:00 on January 6, 1980 of UTC time. The time from the beginning is 0. Further, since the week number is represented by 10 bits, the week number becomes the same every 1024 weeks, and becomes 0 seconds again in 0 weeks after 604799 seconds in 1023 weeks. At this time, the UTC time is 19
It was 23:59:47 on August 21, 1999. The reason why the time does not become 0:00:00 on August 22, 1999 is that leap seconds are not inserted in GPS time and leap seconds are inserted in UTC time, but from January 6, 1980 to August 1999. This is because 13 seconds of leap seconds were inserted before the 21st of the month.

If the reference date management unit 5 sets the reference date to January 6, 1980 and the week number at that time to week 0, the time system conversion unit 6 sets the GPS time to January 6, 1980. Assuming that it is in the range of 1024 weeks from the day, convert it to the format of year / month / day / hour / minute / second. Further, the time system conversion unit 6 includes a leap second information management unit 4.
The UTC time is obtained by performing correction using the leap second information held by the device, and the clock unit 8 obtains the local time by performing correction using the time difference information held by the time difference information management unit 7 and obtains the local time on the display unit 9. Displays the date and time of the time.

When reading the reference date information from the replaceable medium on which the reference date information is recorded, the media reading unit 10 writes the reference date into the reference date management unit 5. Assuming that the reference date at this time is August 20, 1999, for example,
Then, assuming that the GPS time is in the range of 1024 weeks from August 20, 1999, the GPS time is converted to the format of year, month, day, hour, minute, and second. However,
Since the time at 00:00:00 on January 6, 1980 in UTC time is still 0 seconds at 0 weeks, it is calculated using the relationship.

(Second Embodiment) FIG. 2 is a block diagram showing a configuration of a timepiece device according to a second embodiment of the present invention. 2, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the clock unit 8 The display unit 9 has the same configuration as that of the timepiece device of the first embodiment, and a description thereof will be omitted.

The timepiece device according to the second embodiment includes a time difference information management unit 11 for holding time difference information between the UTC time and the local time in the region to be used, and a replaceable medium in which information on the reference date and the time difference is recorded. And a media reading unit 12 for reading information on a reference date and a time difference from the timepiece according to the first embodiment.
Is to write the reference date to the reference date management unit 5 and the time difference information to the time difference information management unit 11, respectively.

(Third Embodiment) FIG. 3 is a block diagram showing a configuration of a timepiece device according to a third embodiment of the present invention. In the configuration of the clock device in FIG. 3, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the time difference information managing The unit 7, the clock unit 8, and the display unit 9 have the same configuration as the configuration of the clock device of the first embodiment, and thus the description is omitted.

The timepiece device according to the third embodiment has a screen input unit.
13 is different from the configuration of the timepiece device of the first embodiment in that the screen input unit 13 can input a reference date from a screen and write the reference date into the reference date management unit 5. is there.

(Fourth Embodiment) FIG. 4 is a block diagram showing a configuration of a timepiece device according to a fourth embodiment of the present invention. 4, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the clock unit 8 The display unit 9 has the same configuration as that of the timepiece device of the first embodiment, and a description thereof will be omitted.

The timepiece device according to the fourth embodiment includes a time difference information management unit 14, a clock unit 15, a screen input unit 16, a reference date calculation unit
17 in that the current date and time are set in the screen input unit 16 and the date and time are set in the clock unit 15, unlike the configuration of the clock device of the first embodiment described above. The reference date calculation unit 17 converts the current date and time into UTC time using the time difference information held by the time difference information management unit 14, and sets a date closer to the past than the current date in the past as the reference date as the reference date management unit 5. Is set to

(Fifth Embodiment) FIG. 5 is a block diagram showing a configuration of a timepiece device according to a fifth embodiment of the present invention. 5, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the display unit 9 The clock unit 15 and the reference date calculation unit 17 have the same configuration as that of the clock device of the fourth embodiment, and a description thereof will be omitted.

The timepiece device according to the fifth embodiment is provided with a time difference information management unit 18 and a screen input unit 19.
Unlike the configuration of the timepiece device of the embodiment, the time difference can also be set from the screen input unit 19 to the time difference information management unit 18.

(Sixth Embodiment) FIG. 6 is a block diagram showing a configuration of a timepiece device according to a sixth embodiment of the present invention. 6, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the clock unit 8 And the display unit 9 are the same as the configuration of the timepiece device of the first embodiment. The reference date calculation unit 17 and the time difference information management unit 18 are the same as the configuration of the timepiece device of the fifth embodiment. Therefore, the description is omitted.

The timepiece device according to the sixth embodiment is provided with the Internet access unit 20, and is different from the first and fifth embodiments in that
Unlike the configuration of the timepiece device of the embodiment of the present invention, any home page can be accessed by the user's specification, but when accessing the home page from which date and time difference information can be obtained, the date is sent to the reference date calculation unit 17 and the time difference information is sent Set in the information management unit 18. The reference date calculation unit 17 calculates a reference date from the current date and sets the reference date in the reference date management unit 5 as in the fourth embodiment.

At this time, for example, a communication type navigation system or an Internet-compatible microwave oven can access the Internet through a telephone line, and therefore may use an existing Internet access unit provided on the application side.

For the date and time difference information, see the homepage of the Communications Research Laboratory, Ministry of Posts and Telecommunications (http://www.crl.go.jp, for example).
In /cgi-bin/JST.pl), information on Japan Standard Time and Coordinated Universal Time (UTC), including the date, is available in real time.

(Seventh Embodiment) FIG. 7 is a block diagram showing a configuration of a timepiece device according to a seventh embodiment of the present invention. 7, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the clock unit 8 The display unit 9, the reference date calculation unit 17, and the time difference information management unit 18 are the same as those in the configuration of the timepiece device according to the sixth embodiment, and a description thereof will be omitted.

The clock device according to the seventh embodiment differs from the clock device according to the sixth embodiment in that a reference date management unit 21, a clock unit 22, and an Internet access unit 23 are provided. The Internet access unit 23 receives the current date from the clock unit 22 and the reference date from the reference date management unit 21, and accesses a homepage that can automatically acquire date and time difference information when the difference exceeds a predetermined period. Is sent to the reference date calculation unit 17 and the time difference information is set in the time difference information management unit 18.

(Eighth Embodiment) FIG. 8 is a block diagram showing a configuration of a timepiece device according to an eighth embodiment of the present invention. 8, the antenna 1, the signal receiving unit 2, the time calculating unit 3, the leap second information managing unit 4, the reference date managing unit 5, the time system converting unit 6, the clock unit 8 The display unit 9 and the time difference information management unit 14 have the same configuration as that of the timepiece device according to the fourth embodiment, and a description thereof will be omitted.

The clock device of the eighth embodiment has a clock unit 24
And a reference date calculation unit 25, which is different from the configuration of the timepiece device of the fourth embodiment in that the reference date calculation unit 25
The reference date is held, the current date is received from the clock unit 24, and when the difference exceeds a certain period, the reference date is automatically calculated and set in the reference date management unit 5 as in the fourth embodiment. Like that.

[0048]

As described above, according to the present invention, there is provided a media reading unit which reads information on a reference date from a replaceable medium on which information on a reference date is recorded and writes the information into a reference date management unit. The base date is updated when a medium on which information is recorded is inserted. If a replaceable medium on which a new base date is recorded is inserted once every ten years,
The effect is obtained that the correct date can be obtained semi-permanently.

Further, the time difference information between the UTC time and the local time of the area to be used is also recorded on the replaceable medium. When the medium for the area to be used is inserted, the time difference information is automatically recorded. Can be updated, and the effect that the local time is required can be obtained.

Further, a screen input unit is provided so that a reference date can be input from the screen. If a new reference date is set once every ten years, a correct date can be obtained semipermanently. The effect that it can be obtained is obtained.

When the current date and time are set on the screen, the reference date is automatically updated. When the current date and time are set once every ten years or more, the reference date is semi-permanently set. The effect is obtained that the correct date can be obtained.

Also, the time difference information can be set from the screen input unit, so that the correct local time can be obtained even when the area to be used changes or when the time difference changes due to the summer time. Can be

Also, an Internet access unit is provided to update the reference date and time difference when accessing a homepage from which date and time difference information can be obtained. The homepage from which date and time difference information can be obtained is accessed. The latest reference date and time difference can be updated each time, and the effect of obtaining the correct date and local time can be obtained.

Further, when the difference between the reference date and the date of the clock section becomes equal to or more than a certain value, a homepage which can automatically acquire the date and time difference information is accessed to update the time difference information and the reference date. Therefore, the time can be automatically updated to the latest reference date, and the effect is obtained that the correct date and local time can be obtained.

Further, the reference date is automatically updated when the difference between the reference date and the date of the clock section is equal to or more than a certain value. It is possible to automatically update the latest reference date. The effect is that the correct date can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a timepiece device according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing a configuration of a timepiece device according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of a timepiece device according to a third embodiment of the present invention;

FIG. 4 is a block diagram showing a configuration of a timepiece device according to a fourth embodiment of the present invention;

FIG. 5 is a block diagram showing a configuration of a timepiece device according to a fifth embodiment of the present invention;

FIG. 6 is a block diagram showing a configuration of a timepiece device according to a sixth embodiment of the present invention;

FIG. 7 is a block diagram showing a configuration of a timepiece device according to a seventh embodiment of the present invention;

FIG. 8 is a block diagram showing a configuration of a timepiece device according to an eighth embodiment of the present invention;

FIG. 9 is a diagram showing the correspondence between GPS time and UTC time;

FIG. 10 is a block diagram showing a configuration of a conventional timepiece device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Signal receiving part 3 GPS time calculating part 4 Leap second managing part 5, 21, 26 Reference date managing part 6 Time system converting part 7, 11, 14, 18 Time difference information managing part 8, 15, 22, 24 Clock part 9 Display unit 10, 12 Media reading unit 13, 16, 19 Screen input unit 17, 25 Reference date calculation unit 20, 23 Internet access unit

Claims (8)

[Claims] 1. A signal receiving unit for receiving a radio wave from a GPS satellite, performing synchronization control on a signal, and demodulating data.
A GPS time calculating unit that extracts GPS time data and calculates a time in a GPS time system;
TC), a leap second information management unit that extracts and stores leap second information, which is a difference from TC, a reference date management unit that stores a reference date for associating GPS time with UTC time, and A time system converting unit for converting to UTC time, a time difference information managing unit for storing time difference information between the UTC time and the local time of the region to be used, and a clock unit for converting the UTC time and time difference information to local time and measuring time And a display unit for displaying the date, month, day, hour, minute, and second of the local time, a medium for reading the reference date information from the replaceable medium on which the reference date information is recorded and writing the reference date information to the reference date management unit. A timepiece device provided with a reading unit so that a reference date can be updated. 2. The timepiece device according to claim 1, wherein the time difference information between the UTC time and the local time of the area to be used is also recorded on the exchangeable medium, so that the time difference information can be updated. 3. The timepiece device according to claim 1, wherein a screen input unit is provided in place of the media reading unit so that a reference date can be input from the screen. 4. When a date and time are set from a screen, a reference date calculation unit for calculating a reference date from the set date / time and time difference information is provided, and the reference date is automatically updated. A clock device as described. 5. The timepiece device according to claim 4, wherein time difference information can be set from a screen input unit. 6. The information processing apparatus according to claim 3, wherein an Internet access unit is provided in place of the screen input unit, and the reference date and the time difference information are updated when accessing a homepage from which date and time difference information can be obtained. A clock device according to any one of the claims. 7. A request for updating a reference date and time difference information by accessing a homepage that can automatically acquire date and time difference information when a difference between the reference date and the date of the clock unit is equal to or more than a certain value. Item 7. The timepiece device according to Item 6. 8. The timepiece device according to claim 4, wherein the reference date is automatically updated when a difference between the reference date and the date of the clock unit is equal to or greater than a predetermined value.