JPH10325889A - Clock system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize an accurate and reliable clock signal inexpensively. SOLUTION: A clock system consists of a GPS satellite, a portable telephone base station 1, and electronic equipment 2 and 3 with an own clock. The portable telephone base station generates a clock signal in synchronization with the world standard time by receiving an electronic wave from the GPS satellite, prescribes a TDMA-TDD(time division multiple access-time division duplexing) transmission/reception timing and reduces the communication failure between base stations, and at the same time distributes a clock signal externally. The electronic equipment receives a clock signal that is distributed from the portable telephone base station and synchronizes the own clock to the clock signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clock system for keeping time with accurate accuracy.

[0002]

2. Description of the Related Art A GPS receiver can receive a radio wave transmitted from a GPS satellite and output an accurate current position, a current time and a clock signal synchronized with the world standard time. This clock signal can have an error range of about 1 μsec with respect to the world standard time.

Accordingly, watches, televisions, video tapes,
If a GPS receiver capable of outputting the clock signal and a self-clock synchronizing means for synchronizing the self-clock with the clock signal output from the GPS receiver are added to various electronic devices such as a recorder and a computer, the clock can be synchronized with the world standard time. It is possible to easily configure a self-timer with high accuracy and display the time with high accuracy that synchronizes with the world standard time, and also to control the video tape recorder etc. with high accuracy when performing answering machine recording etc. It can also be used as a time server for providing highly accurate time in a computer network.

On the other hand, at present, PHS (Personal Handyphon)
e System) and other mobile phones have become widespread, and TDMA-TDD (Time Division Multiple Acces
s-Time Division Duplexing) system is adopted. In this TDMA-TDD system, if transmission / reception timings differ between neighboring base stations, mutual communication is hindered. Therefore, it is preferable that transmission / reception timings be matched as much as possible.

Therefore, in a portable telephone base station adopting the TDMA-TDD system, an expensive and complicated system such as a synchronization system controlled by a center is used to make the transmission and reception timings between neighboring base stations coincide. ing. However, at present, each base station has a GPS antenna device and G
By providing a PS receiver and using a radio wave transmitted from a GPS satellite to obtain an accurate and highly accurate clock signal synchronized with the world standard time at a low cost, the transmission and reception timing of each base station can be matched. Are being considered.

[0006]

By the way, in order to use radio waves transmitted from a GPS satellite, a GPS antenna device receiving a radio wave transmitted from a GPS satellite and a radio wave received by the GPS antenna A GPS receiver that outputs a clock signal synchronized with the GPS receiver is required. These GPS antenna devices and the GPS receiver are connected to each electronic device (clock, television, video tape recorder,
Provided for each computer, the cost for this is increased, and each electronic device becomes expensive. Thus, a situation occurs in which the system is capable of using a time that is accurate, highly accurate, and excellent in use value, but cannot be used.

Further, in a reinforced concrete building where radio waves are hard to enter, radio waves from GPS satellites do not reach a GPS antenna device installed in each electronic device.
A clock signal synchronized with the world standard time from the satellite cannot be obtained. Therefore, to avoid this, GPS
Install the antenna device and GPS receiver on the roof of a reinforced concrete building with outdoor specifications that can withstand the weather, and distribute the clock signal output by this GPS receiver to key places such as rooms using a coaxial cable line. Although it may be possible, a GPS antenna device and a GPS receiver of an outdoor specification which are more expensive than an indoor specification are required, and each electronic device (a clock, a television, a video tape recorder, a computer, etc.) is required. There is a problem that the GPS antenna device and the GPS receiver to be provided are wasted, wasteful costs are increased, and uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an inexpensive and easy-to-use, inexpensive and accurate clock signal that is accurate and accurate in synchronization with the world standard time. To provide a clock system.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a GPS system according to the first aspect.
A clock system including a satellite, a mobile phone base station, and an electronic device having a clock, wherein the mobile phone base station receives a radio wave from a GPS satellite and generates a clock signal synchronized with a world standard time. At least, the transmission and reception timing of the TDMA-TDD system is defined based on the clock signal to reduce communication failure between base stations, and the clock signal is distributed to the outside.
It has a clock that receives a clock signal distributed by the mobile phone base station and ticks the clock signal.

According to a second aspect of the present invention, there is provided a clock system including a GPS satellite, a repeater device for a mobile phone base station, and an electronic device having a clock.
The repeater device for the mobile phone base station receives a radio wave from a GPS satellite, generates a clock signal synchronized with the world standard time, and generates a TDMA signal based on the clock signal.
The transmission and reception timing of the TDD system is defined to reduce the communication failure between the base stations, and the clock signal is distributed to the outside; and the electronic device receives the clock signal distributed by the mobile phone base station. And a clock that keeps time by the clock signal.

According to a third aspect of the present invention, there is provided a clock system including a GPS satellite, a mobile phone base station, and an electronic device having a self-clock, wherein the mobile phone base station is a GPS satellite. And generates a clock signal synchronized with the world standard time, and based on the clock signal, defines transmission / reception timing of the TDMA-TDD system to reduce communication failure between base stations and to reduce the clock signal. The electronic device has a function of receiving a clock signal distributed by a mobile phone base station and synchronizing its own clock with the clock signal.

According to a fourth aspect of the present invention, there is provided a clock system including a GPS satellite, a repeater device for a mobile phone base station, and an electronic device having a self-clock, wherein Repeater device is GP
A radio signal from the S satellite is received to generate a clock signal synchronized with the world standard time, and a TD is generated based on the clock signal.
The transmission and reception timing of the MA-TDD system is defined to reduce communication failure between base stations and distribute the clock signal to the outside. The electronic device receives a clock signal distributed by a mobile phone base station. Thus, it has a function of synchronizing its own clock with the clock signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a timepiece system according to the present invention will now be described with reference to FIGS.
The third embodiment will be described in detail with reference to FIGS. 3 and 4, the third embodiment will be described in detail with reference to FIGS. 5 and 6, and the fourth embodiment will be described in detail with reference to FIGS. 7 and 8. I do.

[First Embodiment] FIG. 1 is an explanatory diagram showing a timepiece system, and FIG. 2 is a block diagram showing a timepiece system. The clock system shown in FIG. 1 includes a GPS satellite (not shown) (a group of artificial satellites, currently 24 in orbit around the earth), a mobile phone base station 1 installed on the roof of building B, and a self-management system. , A time display device 2 corresponding to various electronic devices having a self-timer, a computer 3 and the like.

As a GPS satellite, the US military launched 2
Four satellites are currently in use. GPS satellites
It is managed by a control station on the ground and transmits accurate and highly accurate time signals obtained from atomic clocks.

The mobile telephone base station 1 is installed on the roof of a building B or the like. For example, a PHS base station or the like forms a service area with a radius of several kilometers. Between TDMA-T
It establishes a wireless communication system of the DD system and enables a call between a calling party and a called party.
vices Digital Network) It is connected to a public telephone network via a line.

As shown in FIG. 2, the mobile phone base station 1
Transmitting / receiving antenna device 10, radio unit 11, radio control unit 12, GPS antenna device 13, GPS receiving unit 14
, A clock signal generation unit 15, a main control unit 16, an audio processing unit 17, a line interface unit 18, and a communication interface unit 19.

The transmitting and receiving antenna device 10 transmits and receives radio waves for communicating with the portable terminal A in the service area. The radio unit 11 modulates a signal to be transmitted and sends it to the transmitting / receiving antenna device 10 or receives and demodulates a signal received by the transmitting / receiving antenna device 10. The wireless control unit 12
The main control unit 16 gives a transmission instruction or a reception instruction to the radio unit 11 by using a radio clock that is output based on a clock signal synchronized with the world standard time output by the clock signal generation unit 15. The GPS antenna device 13 receives radio waves from a plurality of GPS satellites.
The GPS receiver 14 amplifies radio waves received by the GPS antenna device 13. The clock signal generation unit 15 generates an accurate and highly accurate clock signal synchronized with the world standard time based on time signals included in respective radio waves from a plurality of GPS satellites.

The main control unit 16 controls the entire mobile phone base station 1 and includes a microprocessor. Specifically, the main control unit 16 includes a radio control unit 12, a clock signal generation unit 15, The audio processing unit 17, the line interface unit 18, the communication interface unit 19, and the like are controlled in synchronization with a clock signal with high accuracy and accuracy synchronized with the world standard time. The audio processing unit 17 converts an analog audio signal into a digital audio signal, or converts a digital audio signal into an analog audio signal. The line interface unit 18 connects the mobile telephone base station 1 to a public telephone line network, and connects to an ISDN line. The communication interface unit 19 outputs an accurate and highly accurate clock signal generated by the clock signal generation unit 15 and synchronized with the universal time.
The data is distributed to the time display device 2 and the computer 3 via the cable L.

On the other hand, the time display device 2 is, for example, a wall clock installed in a public space in the building B, and as shown in FIG.
A control unit 22 and a communication interface unit 23 are provided.
The time display unit 20 is configured by, for example, a liquid crystal display screen, and displays a time based on time data output from the self-timer 21. The self-timer 21 ticks its own time.
This is a clock configured as an electronic circuit, and a timer IC or the like is used. The control unit 22 controls the entire time display device 2 and includes a microprocessor. Specifically, the communication interface unit 23 receives a signal from the mobile phone base station 1 via the cable L. Then, a self-timer 21 is supplied with an accurate and highly accurate clock signal synchronized with the world standard time to make the self-timer 21 coincide with the world standard time. The communication interface unit 23 includes the mobile phone base station 1
Via the cable L, the clock signal output from the communication interface unit 19 and generated by the clock signal generation unit 15 and synchronized with the world standard time.

The computer 3 is, for example, a personal computer having a built-in self-timer installed in a room in a building B. The computer 3 is cascade-connected to the time display device 2 via a cable L. An accurate and highly accurate clock signal synchronized with the standard time is obtained, and a highly accurate clock signal synchronized with the world standard time received via the cable L is supplied to the self-timer, similarly to the time display device 2 described above. The current date and time data is read out from the self-timer and displayed on a display unit such as a CRT by operating the keyboard or mouse as necessary to make the self-timer coincide with the world standard time.

Therefore, in the above-described timepiece system, the self-timers inside various electronic devices can always be made to exactly match the world standard time, and automatic control based on time can be performed with high accuracy. It is possible to easily obtain a clock that ticks an accurate time that has an error of only about 1 μs and has a high utility value. In addition, the GPS antenna device 13, the GPS receiving unit 14, and the clock signal generating unit 15 include the mobile phone base station 1.
Therefore, it can be configured at a low cost.

[Second Embodiment] FIG. 3 is an explanatory diagram showing a timepiece system, and FIG. 4 is a block diagram showing a timepiece system. 3 and 4, the same parts as those of the timepiece system according to the first embodiment are denoted by the same reference numerals, and detailed description of the same parts will be omitted.

In the timepiece system shown in FIG. 3, similarly to the timepiece system of the first embodiment, a GPS satellite (not shown), a mobile phone base station 1 installed on the roof of building B, and the like, It includes a time display device 2 and a computer 3 corresponding to various electronic devices having a self-timer for self-management.

The timepiece system according to the second embodiment is different from the timepiece system according to the first embodiment in that the communication interface unit 1 of the mobile phone base station 1 has a feature.
9a, the wireless unit 4 is connected via a cable L, and the time display device 2 and the computer 3 are connected to the communication interface unit 4 of the wireless unit 4 via the cable L.
4 is connected.

The mobile phone base station 1 according to the second embodiment
Is different from the communication interface unit 19 of the cellular phone base station 1 of the timepiece system according to the first embodiment described above, in that the clock interface signal is synchronized with the world standard time via the cable L and has high accuracy and accuracy. Can be transmitted not only to the time display device 2 and the computer 3, but also to a call signal that enables a call between the calling party and the called party via the mobile terminal A. .

The wireless unit 4 is for covering a place where it is difficult to directly transmit and receive radio waves to and from the transmitting / receiving antenna device 10 of the mobile phone base station 1. In this example, FIG.
Is installed indoors in Building B where radio waves are difficult to reach,
As shown in FIG. 4, the transmission / reception antenna device 40, a radio unit 41, a radio control unit 42, a main control unit 43, and a communication interface unit 44 are provided.

The transmission / reception antenna device 40 transmits and receives radio waves for communicating with the portable terminal A in the service area. The radio unit 41 modulates a signal to be transmitted and sends it out to the transmitting / receiving antenna device 40, or receives and demodulates a signal received by the transmitting / receiving antenna device 40. The wireless control unit 42
A transmission instruction or a reception instruction is given to the wireless unit 41. The main control unit 43 controls the entire wireless unit 4 and includes a microprocessor. Specifically, the main control unit 43 includes the wireless control unit 42, the communication interface unit 44, and the like. The control is performed in synchronization with a clock signal with high accuracy and accuracy synchronized with the world standard time transmitted from the communication interface unit 44 and received by the communication interface unit 44.

The communication interface unit 44 not only distributes the accurate and accurate clock signal output from the communication interface unit 19a of the mobile phone base station 1 and synchronized with the world standard time to the time display device 2 and the computer 3, but also A call signal enabling communication between the calling party and the called party via the portable terminal A is transmitted / received to / from the communication interface unit 19a via the cable L.

Therefore, in the timepiece system according to the second embodiment as described above, the self-timers inside various electronic devices can always be made to exactly match the world standard time, and the automatic timekeeping based on the time can be performed. It is possible to easily obtain a clock that ticks an accurate time that only generates an error of about 1 μs with high utility value, such as performing control with high accuracy, and has a GPS antenna device 13, a GPS receiver 14, and a clock signal generator 15. Means that the mobile phone base station 1 also serves as
It can be configured at low cost. In addition, since the wireless unit 4 is provided, it is possible to cover a place where it is difficult to directly transmit and receive radio waves to and from the transmitting / receiving antenna device 10 of the mobile phone base station 1, thereby expanding the service area for the mobile terminal A.

[Third Embodiment] FIG. 5 is an explanatory diagram showing a timepiece system, and FIG. 6 is a block diagram showing a timepiece system. In FIGS. 5 and 6, the same parts as those of the timepiece system of the above-described first embodiment are denoted by the same reference numerals, and detailed description of the same parts will be omitted.

In the clock system shown in FIG. 5, various types of GPS satellites (not shown), a repeater device 5 for the mobile phone base station 1 installed on the roof of the building B, and a self-clock for self-management are provided. It includes a time display device 2 corresponding to an electronic device, a computer 3 and the like.

The timepiece system according to the third embodiment differs from the timepiece system according to the first embodiment in that the GPS antenna device 53 is a dual-purpose structure.
Each of the GPS receiver 54 and the clock signal generator 55 is not of the mobile phone base station 1 but of the repeater device 5.

The repeater device 5 is difficult to directly transmit and receive radio waves to and from the transmission / reception antenna device 10 of the mobile phone base station 1, can cover a place such as a valley of a building, and can provide a service area for the mobile terminal A. This is for extension, and the repeater device 5 itself is installed in a place where radio waves can be directly transmitted and received between the transmitting and receiving antenna device 10 of the mobile phone base station 1. The repeater device 5 simply relays the received radio wave as it is, and as shown in FIG. 6, a transmission / reception antenna device 50, a radio unit 51, a radio control unit 52, a GPS antenna device 53, a GPS reception unit 54, a clock signal generation unit 55, a main control unit 56,
A communication interface unit 57;

The transmitting and receiving antenna device 50 transmits and receives radio waves for communicating with the portable terminal A in the service area. The radio unit 51 modulates a signal to be transmitted and sends it to the transmitting / receiving antenna device 50, or receives and demodulates a signal received by the transmitting / receiving antenna device 50. The wireless control unit 52 includes:
A transmission instruction or a reception instruction is given to the wireless unit 51. The GPS antenna device 53 receives radio waves from a plurality of GPS satellites. The GPS receiving unit 54
The radio wave received by the antenna device 53 is amplified. The clock signal generation unit 55 generates an accurate and highly accurate clock signal synchronized with the world standard time based on respective time signals included in radio waves from a plurality of GPS satellites.

The main control unit 56 controls the entire repeater device 5 and includes a microprocessor. Specifically, the main control unit 56 includes a radio control unit 52, a clock signal generation unit 55, a communication interface The section 57 and the like are controlled in synchronization with a clock signal having high accuracy and accuracy synchronized with the world standard time. The communication interface unit 57 distributes the clock signal generated by the clock signal generation unit 55 and synchronized with the world standard time with high accuracy and accuracy to the time display device 2 and the computer 3 via the cable L.

Therefore, in the timepiece system of the third embodiment as described above, the self-timers inside various electronic devices can always be made to exactly match the world standard time, so that the automatic time-based It is possible to easily obtain an accurate time-keeping clock that generates only a useless error of about 1 microsecond, such as performing control with high accuracy. In addition, the GPS antenna device 53, the GPS receiver 54, and the clock signal generator 55 Means that the device of the repeater device 5 is also used, so that it can be constructed at a low cost.

[Fourth Embodiment] FIG. 7 is an explanatory diagram showing a timepiece system, and FIG. 8 is a block diagram showing a timepiece system. 7 and 8, the same reference numerals are given to the same portions as those of the timepiece systems according to the second and third embodiments, and the detailed description of the same portions will be omitted.

In the timepiece system shown in FIG. 7, similarly to the timepiece system of the third embodiment, a GPS satellite (not shown), a repeater device 5 installed on the roof of building B, and the like, , A time display device 2 corresponding to various electronic devices having a self-timer, a computer 3 and the like.

The difference between the timepiece system of the fourth embodiment and the timepiece system of the third embodiment is that the communication interface unit 57 of the repeater device 5 has a feature.
a, a wireless unit 4 is connected via a cable L, and the time display device 2, the computer 3, and the like are connected via a cable L to the communication interface unit 44 of the wireless unit 4.
This is the configuration connected to

The communication interface unit 57a of the repeater device 5 of the fourth embodiment differs from the communication interface unit 57 of the repeater device 5 of the timepiece system of the third embodiment in that Not only can a clock signal with high accuracy and accuracy synchronized with the world standard time be delivered to the time display device 2 or the computer 3, but also a call between the calling party and the called party can be made via the portable terminal A. To be transmitted.

The radio unit 4 is for covering a place where it is difficult to directly transmit and receive radio waves between the transmitting and receiving antenna device 10 of the mobile phone base station 1 and the transmitting and receiving antenna device 50 of the repeater device 5. In this example, as shown in FIG. 7, it is installed inside a building B where radio waves are difficult to reach, and as shown in FIG. 8, the transmission / reception antenna device 40, the radio unit 41, the radio control unit 42, and the main control unit 43 and a communication interface unit 44.

The transmitting and receiving antenna device 40 transmits and receives radio waves for communicating with the portable terminal A in the service area. The radio unit 41 modulates a signal to be transmitted and sends it out to the transmitting / receiving antenna device 40, or receives and demodulates a signal received by the transmitting / receiving antenna device 40. The wireless control unit 42
A transmission instruction or a reception instruction is given to the wireless unit 41. The main control unit 43 controls the entire wireless unit 4 and includes a microprocessor. Specifically, the main control unit 43 includes the wireless control unit 42, the communication interface unit 44, and the like. The control is performed in synchronization with a clock signal with high accuracy and accuracy synchronized with the world standard time transmitted from the communication interface unit 44 and received by the communication interface unit 44.

The communication interface unit 44 not only distributes the accurate and highly accurate clock signal output from the communication interface unit 57a of the repeater device 5 and synchronized with the world standard time to the time display device 2 and the computer 3, but also
A call signal that enables a call between the calling party and the called party via the portable terminal A is transmitted / received to / from the communication interface unit 57a.

Therefore, in the timepiece system according to the fourth embodiment as described above, the self-timers inside various electronic devices can always be made to exactly match the world standard time, and the time can be automatically set based on the time. It is possible to easily obtain an accurate time-keeping clock that generates only a useless error of about 1 microsecond, such as performing control with high accuracy. In addition, the GPS antenna device 53, the GPS receiver 54, and the clock signal generator 55 Means that the device of the repeater device 5 is also used, so that it can be constructed at a low cost. In addition, since the wireless unit 4 is provided, it is possible to cover a place where it is difficult to directly transmit and receive radio waves between the transmitting and receiving antenna device 10 of the mobile phone base station 1 and the transmitting and receiving antenna device 50 of the repeater device 5, The service area for the portable terminal A can be expanded.

In the portable clock system according to the above-described embodiment, the clocks of various electronic devices are self-clocks, and when there is a clock signal distributed via the cable L, the clock is synchronized with the clock signal. Although described as an example, the present invention is not limited to this, and it is needless to say that a clock directly driven by a clock signal distributed via the cable L may be used.

[0047]

According to the first or second aspect of the present invention,
In order to obtain the TDMA-TDD transmission / reception timing of the mobile phone base station, a clock signal for the mobile phone base station synchronized with the world standard time generated by receiving radio waves from GPS satellites is also used. This makes it possible to provide an excellent timepiece system in which a highly accurate, highly accurate clock signal synchronized with the world standard time can be used easily at low cost _.

According to the third or fourth aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, furthermore, even if the clock signal is temporarily and accurately synchronized with the world standard time, the distribution of the clock signal with high accuracy is interrupted. Even so, it can provide an excellent timepiece system that does not stop immediately because the clock signal distribution is interrupted because the self-timer can tickle the time to some extent by itself. It works _.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a timepiece system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing the timepiece system.

FIG. 3 is an explanatory diagram showing a timepiece system according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing the timepiece system.

FIG. 5 is an explanatory diagram showing a timepiece system according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing the timepiece system.

FIG. 7 is an explanatory diagram showing a timepiece system according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing the timepiece system.

[Description of Signs] 1 Mobile phone base station 2 Electronic device having self-timer 3 Electronic device having self-timer 5 Repeater device

Continued on the front page (72) Inventor Kazuhiro Honda 1048 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd.

Claims (4)

[Claims] 1. A timepiece system including a GPS satellite, a mobile phone base station, and an electronic device having a clock, wherein the mobile phone base station receives a radio wave from a GPS satellite, Generating a synchronous clock signal, defining transmission / reception timing of the TDMA-TDD system based on the clock signal to reduce communication failure between base stations, and distributing the clock signal to the outside; A clock system in which the device receives a clock signal distributed by a mobile phone base station and has a clock that keeps time by the clock signal. 2. A clock system including a GPS satellite, a repeater device for a mobile phone base station, and an electronic device having a clock, wherein the repeater device for the mobile phone base station transmits radio waves from the GPS satellite. A clock signal that is received and synchronized with the world standard time is generated, and TDMA is performed based on the clock signal.
The transmission and reception timing of the TDD system is specified to reduce communication failure between base stations, and the clock signal is distributed to the outside; and the electronic device receives the clock signal distributed by the mobile phone base station. And a clock system for ticking time by the clock signal. 3. A clock system comprising a GPS satellite, a mobile phone base station, and an electronic device having a self-clock, wherein the mobile phone base station receives a radio wave from a GPS satellite and Generating a clock signal synchronized with the clock signal, defining transmission / reception timing of the TDMA-TDD system based on the clock signal, reducing communication failure between base stations, and distributing the clock signal to the outside. A clock system in which an electronic device has a function of receiving a clock signal distributed by a mobile phone base station and synchronizing its own clock with the clock signal. 4. A timepiece system comprising a GPS satellite, a repeater device for a mobile phone base station, and an electronic device having a self-clock, wherein the repeater device for the mobile phone base station uses radio waves from a GPS satellite. To generate a clock signal synchronized with the world standard time, and based on the clock signal,
The transmission and reception timing of the TDD system is specified to reduce communication failure between base stations, and the clock signal is distributed to the outside; and the electronic device receives the clock signal distributed by the mobile phone base station. A clock system having a function of synchronizing a self-clock with the clock signal.