JPH0996692A - Clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a clock in which the GPS time can be converted correctly into a time at a using site only through a simple converter by presetting the time difference at the using site from the Greenwich standard time. SOLUTION: A GPS receiver 1 determines the current GPS time from GPS time information contained in a data transmitted from GPS satellites. In a time converter 2, the time difference at a using site from Greenwich standard time is preset. A GPS time received by the receiver 1 is corrected for the time difference for the Greenwich standard time at the time converter 2 before being delivered to a time setter 3. The time setter 3 delivers the received time to the clock body 4 where the received time is displayed. Since the time difference information between respective areas on the glove and the GPS time is not required to be prestored, correct time can be set at the using time by providing a simple time converter 2 for correcting only the time difference thus realizing the small and low cost clock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece device installed in a station, a building or the like and capable of automatically setting a time at a place of use by using a GPS (Global Positioning System) receiver.

[0002]

2. Description of the Related Art FIG. 6 shows the structure of a conventional timepiece device of this type. In FIG. 6, reference numeral 101 denotes a GPS receiver that receives position information and time information from GPS satellites, and 10
2 is a determination device, 103 is a storage device, 104 is a computing device,
Reference numeral 105 is a time setting device, and 106 is a watch body.

The operation of the timepiece device configured as described above will be described below. In the storage device 103, the earth is divided into several regions and the longitudes of places such as cities that are the basis of standard time in each region are recorded in advance. The position of the determination device 102 is determined based on the position information of the user measured by the GPS receiving device 101. The arithmetic device 104 converts the GPS time obtained by the GPS receiving device 101 into the time of the area, and the time setting device 105 automatically sets the time in the timepiece main body 106.

As described above, in the above conventional timepiece device, the time difference information between each region on the earth and the GPS time is stored in advance, so that the region obtained from the position and the GPS time obtained by the GPS receiving device can be used to determine the region. The time can be calculated and set automatically.

[0005]

However, the conventional timepiece device described above has a problem in that the time difference information between each region on the earth and the GPS time must be stored in advance, which makes the device large. In addition, there is a possibility that the time difference to be converted may be wrong near the boundary of each area.

The present invention solves such a conventional problem. By setting a time difference from Greenwich Mean Time at the place of use in advance, the GPS time can be accurately set to the time at the place of use with only a simple conversion device. An object is to provide a timepiece device that can be converted.

Another object of the present invention is to provide a low-cost timepiece device which can always obtain GPS time even with a GPS receiving device having only one-channel signal demodulating means.

It is another object of the present invention to provide a timepiece device which can automatically calculate the time difference and set the time at the place of use correctly without setting the time difference from Greenwich Mean Time at the place of use.

[0009]

In order to achieve the above object, the present invention provides a time conversion device capable of setting a time difference from Greenwich Mean Time at a place of use, and provides time difference information between each region on the earth and GPS time. Even if you don't remember all
The time at the place of use can be set correctly.

Further, according to the present invention, a GPS receiving device for only one channel is provided in place of the ordinary GPS receiving device which requires a plurality of channels, and the rough position is externally set in the tracking satellite selecting means. The satellite time is always tracked so that the GPS time can be obtained.

Further, according to the present invention, by learning and storing the storage means and the trackable satellite, the satellite is always tracked by the GPS receiving device having only one channel without setting the approximate position of the GPS receiving device from the outside. The GPS time can be obtained by using this method.

Further, according to the present invention, the time difference to be corrected is automatically obtained by presetting the approximate time at the place of use.

[0013]

Therefore, according to the present invention, the GPS time can be correctly converted into the time of the place of use by only a simple conversion device by setting the time difference from the Greenwich Mean Time at the place of use in advance.

Further, according to the present invention, even a GPS receiving device having only one channel can always obtain a correct GPS time, and a timepiece device at a lower cost can be realized.

Further, according to the present invention, the time difference to be corrected can be automatically obtained by setting the approximate time at the use place in advance, and the accurate time at the use place can be automatically calculated using the time difference. Can be set as desired.

[0016]

【Example】

(Embodiment 1) FIG. 1 shows the configuration of a first embodiment of the present invention. In FIG. 1, 1 is a GPS receiver, 2 is a time conversion device, 3 is a time setting device, and 4 is a watch body. FIG. 2 shows an internal configuration of the GPS receiving apparatus 1 in FIG. 1, 11 is a plurality of signal demodulating means, 12 is a positioning calculating means, and 13 is a tracking satellite selecting means.

Next, the operation of the first embodiment will be described with reference to FIG.
This will be described with reference to FIG. The GPS receiver 1 is a GPS
The current GPS time is obtained from the GPS time information included in the data sent from the satellite. In the GPS receiving apparatus 1, the signal demodulating means 11 of a plurality of channels track a plurality of satellites to demodulate data, and the positioning calculating means 12 uses the data to detect the position of the GPS receiving apparatus and the GP.
Find the S time. The tracking satellite selection means 13 calculates a trackable satellite from the position of the GPS receiver, orbit information of the satellite, and GPS time, and calculates the signal demodulation means 1
Indicate the satellite to track to 1.

The GPS time obtained by the GPS receiving device 1 is corrected by the time converting device 2 by the time difference from the preset Greenwich Mean Time and sent to the time setting device 3. The time setting device 3 outputs the received time to the timepiece main body 4, and the timepiece main body 4 displays the time.

As described above, according to the first embodiment,
Since it is not necessary to store the time difference information between each region on the earth and the GPS time in advance, the time difference is corrected instead of the determination device 7, the storage device 8 and the arithmetic device 9 in the conventional timepiece device of FIG. Only by including the simple time conversion device 2, it is possible to correctly set the time at the place of use, and it is possible to realize the device in a small size and at low cost.

(Embodiment 2) FIG. 3 shows the internal structure of a GPS receiver 1 according to a second embodiment of the present invention. The overall configuration of the timepiece device is the same as in FIG. In FIG. 3, 14 is a signal demodulating means, which is provided with only one channel. Reference numeral 15 is a tracking satellite selection means, which calculates a trackable satellite from the approximate GPS receiver position set from the outside and the satellite orbit information and GPS time information obtained from the signal demodulation means 14, and the tracking satellite sinks. Switch to another satellite before. The approximate GPS receiver position is only used for elevation calculation to calculate trackable satellites, so 1
It does not matter if there is an error of about 00 km. Also,
GP obtained by one-channel signal demodulation means 14
As for the S time, if the GPS receiver position is known with an accuracy of about 100 km, it can be obtained with an accuracy of about 0.3 ms, and the device can be realized at low cost.

(Embodiment 3) FIG. 4 shows the internal structure of a GPS receiver 1 according to a third embodiment of the present invention. The overall configuration of the timepiece device is the same as in FIG. In FIG. 4, 16 is a signal demodulating means, which is provided with only one channel. Reference numeral 17 denotes a storage unit that stores the satellite positions that can be tracked in the past, so that the tracking range can be learned and the satellite being tracked can be tracked without setting an approximate GPS receiver position from the outside. Switch to another satellite before it runs out.

Since the GPS satellites are moving above an altitude of about 20,000 km, the distance from the GPS receiving apparatus 1 is about 20,000 km to about 26,000 km. It takes about 67 ms to about 87 ms until the GPS receiving device 1 receives it. Therefore, assuming that the propagation time is 77 ms on average, G
Even if the position of the PS receiver 1 is not known, the GPS time can be obtained with an accuracy of about ± 10 ms, and the device can be realized at low cost.

(Embodiment 4) FIG. 5 shows the construction of a fourth embodiment of the present invention. The difference from the first embodiment of FIG. 1 is the time conversion device 5 and the timepiece body 6. The user sets the time at the place of use in the watch body 6 in advance within 30 minutes, and the time conversion device 5 calculates the time difference from the GPS time obtained from the GPS receiving device 1 and the time difference between the watch body 6. . Therefore, the user can save the labor of calculating the time difference from the Greenwich Mean Time at the place of use, and the device can be realized at low cost. The other operations are the same as those in the first embodiment, and will be omitted.

(Embodiment 5) The fifth embodiment of the present invention uses a GLONASS receiver implemented in the Russian Federation in place of the GPS receiver in each of the above-mentioned embodiments, and is similar to the above. Have an effect.

[0025]

According to the present invention, as is apparent from the first embodiment, the GPS time obtained by the GPS receiver is set to the use location by setting the time difference from the Greenwich Mean Time in the use location in advance. The time can be converted into the time of day, the time of the place of use can be correctly set by using a simple time conversion device that only corrects the time difference, and the device can be realized in a small size and at low cost.

Further, according to the present invention, as is apparent from the second embodiment, by setting the approximate position of the GPS receiving device from the outside, even a GPS receiving device having only one channel always keeps track of the satellite and GPS. The time can be obtained, and the device can be realized at a lower cost.

Further, as is apparent from the third embodiment, the present invention learns the trackable satellites so that the GPS receiver of only one channel can be set without setting the approximate position of the GPS receiver from the outside. However, the satellite is always tracked and G
The PS time can be obtained, the device can be realized at low cost, and the user can save the labor of setting.

Further, as is apparent from the fourth embodiment, the present invention is such that the time difference to be corrected is automatically obtained by setting the approximate time at the place of use in advance. The user can save the labor of calculating the time difference from the Greenwich Mean Time at the place of use and can realize the device at low cost.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an internal configuration of a GPS receiving apparatus according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing an internal configuration of a GPS receiving device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing an internal configuration of a GPS receiving device according to a third embodiment of the present invention.

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

FIG. 6 is a block diagram showing a configuration of a conventional timepiece device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 GPS receiving device 2, 5 Time converting device 3 Time setting device 4, 6 Clock body 7 Judging device 8 Storage device 9 Computing device 11, 14, 16 Signal demodulating means 12 Positioning computing means 13, 15 Tracking satellite selecting means 17 Storage means

Claims (5)

[Claims] 1. A GPS receiving device for obtaining GPS time, a time converting device for correcting the obtained GPS time by a time difference from Greenwich Mean Time at a preset place of use, and the corrected time is set in a watch body. A timepiece device including a time setting device and a timepiece main body that displays a set time. 2. A GPS satellite receiver is provided with a rough position of a place of use set in the tracking satellite selecting means so that the satellite being tracked can be switched to another satellite before sinking.
Only with the 1 channel signal demodulation means, GP
The timepiece device according to claim 1, wherein the S time is obtained. 3. A satellite that has been tracked in the past is stored in the storage means and a satellite being tracked can be tracked to other satellites before the satellite cannot be tracked even if the GPS receiver is not set with a rough position of the place of use from the outside. The timepiece device according to claim 1, wherein the GPS time is always obtained only by providing a signal demodulating means for one channel by switching. 4. The time of the timepiece main body and the GPS receiver can be obtained by setting the time of the timepiece main body within 30 minutes in advance without setting the time difference from Greenwich Mean Time at the place of use. The timepiece device according to claim 1, wherein the time difference is automatically calculated from the GPS time. 5. GLONAS instead of GPS receiver
The timepiece device according to claim 1, wherein the S receiver is used.