JPH06222168A - Method for calibrating clock via communication line - Google Patents

Abstract

PURPOSE:To reduce investments on the whole system by calibrating a clock device in a central-point installation by reception of standard time information, and calibrating other clock devices in remote-point installatios in sequence in accordance with the time information from said clock device, CONSTITUTION:The muP4 of a central-point installation 1 uses a time reader 7 to fetch time information obtained by means of a radio receiving unit 6, for calibrating a clock device 5. The muP4 fetches time information from the device 5 and produces a test signal and transmits the signal to public lines 3 via a transmitting-receiving unit 8 so that the signal is transferred to a predetermined remote-point installation 2. When a transmitting-receiving unit 12 receives the signal, a muP10 performs reception processing and then produces a test signal and transfers it to the installation 1 via the unit 12 and the lines 3. When the unit 8 receives the test signal, the muP4 computes the communication delay time and then computes time calibration data for transmission to the installation 2, and re-transfers the data to the installation 2 using a similar course. The muP10 fetches the time calibration data through a similar course and calibrates the time of the clock device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time calibration method for a timepiece via a communication line, which is used for time calibration of a timepiece provided in each device connected via the communication line.

[0002]

2. Description of the Related Art When connecting various measuring devices and control devices into a system, these are connected by a public line,
In many cases, the measurement result of each measuring device arranged in each place is transmitted to a control device through a public line for processing.

In this case, in order to match the sampling times of the data obtained by the measuring devices arranged in various places, each measuring device has a clock, and when the data is sampled, the sampling time data is detected. The collected data and the collected time data are transmitted to the control device provided in the central monitoring room side via the public line.

[0004]

By the way, in such a data collection system, it is necessary to set the time in order to ensure the accuracy of the timepiece device incorporated in the microprocessor of each measuring instrument. Therefore, the frequency of time adjustment must be determined according to the accuracy of the timepiece device provided in such a microprocessor, and the time of this timepiece device must be calibrated at least once a day.

For this reason, in the past, for each point, the hourly time signal of the radio, for example, the time signal of the FM broadcast of NHK, the time signal of JJY which is broadcast in the short wave from Tsukuba, Ibaraki, or the GPS satellite is sent. The standard time broadcast such as the GPS time broadcast is received and the time is adjusted based on the time information.

As described above, in order to adjust the time of the timepiece device at each point, it is necessary to install a radio receiving device and a time reading device at each point. However, there is a problem that normal time reading cannot be performed at a point where the reception state of radio waves is poor. Alternatively, since such a radio receiving device and time reading device are expensive, there has been a problem that the investment burden becomes large when the number of various measuring devices installed increases.

The present invention was developed in view of the above circumstances, and one radio receiving device and one time reading device can adjust the time of each device constituting the system. It is an object of the present invention to provide a time calibration method for a clock via a communication line, which can ensure the maximum investment efficiency while significantly reducing the investment cost of the entire system.

[0008]

In order to achieve the above object, a method for time calibration of a timepiece through a communication line according to the present invention is a timepiece device of a central point device and remote point devices provided at respective remote points. In a method for time calibration of a clock via a communication line for adjusting the time of the clock device, the radio receiver provided in the central point device receives standard time information and calibrates the clock device in the central point device. According to the time information obtained by the timepiece device, the timepiece device is characterized in that the timepiece device provided in each remote point device is calibrated via the communication line to adjust the time of each timepiece device.

[0009]

In the above structure, standard time information is received by the radio receiving device provided in the central point device to calibrate the timepiece device in the central point device, and based on the time information obtained by this timepiece device. By calibrating the timepiece device provided in each remote point device through the communication line to adjust the time of each timepiece device, one radio receiving device and one time reading device form each system. The time of the equipment is adjusted, which greatly reduces the investment cost of the entire system and ensures the maximum investment efficiency.

[0010]

1 is a block diagram showing an example of a data collection system to which an embodiment of a time calibration method for a timepiece via a communication line according to the present invention is applied.

The data collection system shown in this figure includes a central point device 1 installed in a monitoring room, a plurality of remote point devices 2 arranged at respective measurement target points, and each of these remote point devices 2. The central point device 1 is connected to the public line 3 and the central point device 1 receives the standard time information by using the radio receiving device 6 (see FIG. 2) and the clock in the central point device 1 is received. The device 5 (see FIG. 2) is calibrated, and the clock device 11 (see FIG. 2) provided in each remote point device 2 via the public line 3 based on the time information obtained by the clock device 5 is installed. After the calibration, the time of each of the timepiece devices 5 and 11 is adjusted. Then, data is collected by each remote location device 2, and the data obtained by this collection processing and the collection time data are collected on the public line 3
The data is transmitted to the central point device 1 via the.

The central point device 1 is, as shown in FIG. 2, a microprocessor 4 for performing various kinds of data processing, a clock device 5 incorporated in the microprocessor 4 for performing timekeeping operation to generate time data, and a radio receiver. Time signal, such as FM broadcast time signal of NHK, JJY time broadcast from Tsukuba, Ibaraki prefecture, or standard time broadcast such as GPS time broadcast sent from GPS satellites is received to receive these times. Radio receiving device 6 for outputting information
When the transmission data is output from the time reading device 7 that reads the time information obtained by the radio receiving device 6 and calibrates the time of the timepiece device 5, and the microprocessor 4, this is converted into a transmission signal. Then, when the transmission signal is supplied through the public line 3 and the transmission signal is supplied, the reception signal is generated and the reception data is generated.
A transceiver 8 for supplying this to the microprocessor 4 is provided.

Then, the standard time information is received using the radio receiving device 6 to calibrate the timepiece device 5, and based on the time information obtained by the timepiece device 5, each remote point is sent via the public line 3. The timepiece device 11 provided in the device 2 is calibrated to adjust the time of each of the timepiece devices 5 and 11. Then, each remote point device 2 collects data, and the data obtained by this collection process and the collection time data are taken in through the public line 3 and processed. Each remote point device 2 has a microprocessor 10 for performing various processing such as data collection processing.
A clock device 11 which is built in the microprocessor 10 and performs timekeeping operation to create time information; and when transmission data is output from the microprocessor 10, the transmission data is converted into a transmission signal and the public line 3 is connected. Sent to
When a transmission signal is supplied through the public line 3, the transmission signal is received to generate reception data and then the transmission / reception device 12 supplies the microprocessor 10 with the reception data.

When a transmission signal is supplied through the public line 3, the reception signal is taken in to generate reception data, and the reception data is processed to calibrate the time of the timepiece device 11 and perform various processes. Data is collected at a cycle of
The data obtained by this sampling operation and the sampling time data are converted into a transmission signal and sent to the public line 3.

Next, the time setting operation of this embodiment will be described with reference to the flow chart shown in FIG. 3 and the timing chart shown in FIG.

First, the microprocessor 4 of the central point apparatus 1 selects the remote point apparatus 2 to be time-calibrated (step ST1), and the time information obtained by the receiving operation of the radio receiving apparatus 6 is read by the time reading apparatus 7. The time of the timepiece device 5 is calibrated to the correct time (step ST3).

Next, the microprocessor 4 of the central point device 1 secures the public line 3 with the remote point device 2 to be time-calibrated, and then takes in the time information output from the clock device 5 to generate a test signal. At the same time, it is sent to the public line 3 via the transmission / reception device 8 and transmitted to the remote point device 2 to be time-calibrated (step S).
T4).

When the test signal is received by the transmitter / receiver 12 of the remote point device 2 to be time-calibrated, the microprocessor 10 of the remote point device 2 performs the test signal receiving process (step ST1).
0), a test signal is generated based on this processing result, and this is also sent out to the public line 3 via the transmission / reception device 12 and transmitted to the central point device 1 (step ST1).
1). Next, when this test signal is received by the transmitter / receiver 8 of the central point device 1, the microprocessor 4 of the central point device 1 takes in this test signal (step ST5) and outputs the time information output from the clock device 5. After capturing, the communication delay time Δt is calculated based on the following equation (step ST6). Δt = (t2-t1) / 2 (1) where t2 is the time when the test signal is received by the central point device 1. t1: Time when the test signal is transmitted by the central point device 1.

After that, the microprocessor 4 of the central point device 1 calculates the time calibration data t0 (true calibration time data) to be transmitted to the remote point device 2 to be time-calibrated based on the following equation (step). In ST7), this is transmitted to the public line 3 via the transmission / reception device 8 and transmitted to the remote point device 2 which is the time calibration target (step ST8). t0 = t + Δt (2) Here, t: current time obtained by the clock device 5 of the central point device 1.

When the calibration time data t0 is received by the transmitter / receiver 12 of the remote point device 2 to be time-calibrated, the microprocessor 10 of the remote point device 2 fetches the calibration time data t0 (step ST12), after calibrating the time of the clock device 11 provided in the own remote point device 2 based on this calibration time data t0, the communication line constituted by the public line 3 is cut off and abandoned ( Step ST1
3).

After that, the central point device 1 calibrates the time of the clock device 11 provided in each of the remote point devices 2 by performing the above-described time calibration process on the remaining remote point devices 2.

As described above, in this embodiment, the central point device 1 receives the standard time information by using the radio receiving device 6 to calibrate the timepiece device 5 in the central point device 1, and the timepiece device 5 is also calibrated. The timepiece devices 5 and 11 are calibrated by calibrating the timepiece device 11 provided in each remote point device 2 via the public line 3 based on the time information obtained by
Since the time adjustment of each device constituting the system can be performed by one radio receiving device 6 and one time reading device 7, the investment cost of the entire system can be significantly increased. While reducing
Maximum investment efficiency can be secured.

Thus, for example, when the time calibration method of the clock according to the present invention is applied to the seismic observation system as shown in FIG. 5, the sampling time of the measurement data of the strong seismograph 20 installed at each point. Can be accurate.

In this case, the central point device 1a constituting this earthquake observation system has an antenna 22 mounted on the roof of the building 21, a radio receiving device 23 provided in the building 21, a clock device and a microprocessor. A data recording device 24 and a transmission / reception device 25 configured by a modem or the like are provided, and when performing time calibration of the clock device provided in each remote point device 2a, the radio receiver 23 is used to set the standard time. While receiving the information to calibrate the timepiece device, the timepiece device provided in each remote point device 2a is calibrated via the telephone line 26 based on the time information obtained by the timepiece device to calibrate the timepiece device. Adjust the time. Then, each remote point device 2a
The seismic data is collected by the telephone line 2 and the seismic data obtained by this sampling process and the sampling time data are collected.
Capture via 6 and process this.

Further, the remote point device 2a constituting the seismic observation system is a transmitting / receiving device 27 constituted by a modem, a strong seismograph 20 installed at the observation point, an A / D converter, a clock device, a microprocessor, etc. A telephone line 26
When a transmission signal is supplied via the, the received data is taken in to generate received data, and this is processed to perform time calibration of the clock device and various processing, and seismic data is acquired when the amplitude exceeds a predetermined value. For example, the seismic data obtained by the sampling operation and the sampling time data thereof are converted into a transmission signal and transmitted to the telephone line 26.

[0026]

As described above, according to the present invention, 1
One radio receiving device and one time reading device can be used to adjust the time of each device that composes the system. This makes it possible to significantly reduce the investment cost of the entire system and ensure the maximum investment efficiency. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a data collection system to which an embodiment of a time calibration method for a timepiece via a communication line according to the present invention is applied.

FIG. 2 is a block diagram showing a detailed circuit configuration example of a central point device and a remote point device shown in FIG.

FIG. 3 is a flowchart showing an operation example of the data collection system shown in FIG.

FIG. 4 is a timing chart showing an operation example of the data collection system shown in FIG.

FIG. 5 is a configuration diagram showing an example of an earthquake observation system to which a time calibration method for a clock via a communication line according to the present invention is applied.

[Explanation of symbols]

 1 Central point device 2 Remote point device 3 Public line (communication line) 4 Microprocessor 5 Clock device 6 Radio receiving device 7 Time reading device 8 Transceiver device 11 Clock device 10 Microprocessor 12 Transceiver device

Front Page Continuation (72) Inventor Katsuhisa Kanda 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hiroshi Koshida 2-1-1-19 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Company Research Institute (72) Inventor Kenji Ueno 2-1-1, Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hiroai Yamatani 2-1-1, Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Company Technology Research Center

Claims (1)

[Claims] 1. A time point calibration method for a timepiece via a communication line for adjusting the time points of a timepiece device of a central point device and a timepiece device of each remote point device provided at each remote point. The radio receiver receives standard time information to calibrate the clock device in the central point device, and is provided to each remote point device via the communication line based on the time information obtained by this clock device. A time calibration method for a timepiece via a communication line, wherein the timepiece device is calibrated to adjust the time of each timepiece device.