JPS601948A - System synchronism system - Google Patents

Abstract

PURPOSE:To obtain a result with excellent time accuracy on data analysis by adjusting a data sample timing on an observing point by means of remote control so as to be adapted to a data sample timing at an observing station thereby attaining the data recording without jitter at all times. CONSTITUTION:A data is sampled at an observing point telemeter transmitter section 2 with a sample signal from a sample signal generating circuit 1 at an observing point and also the data is transmitted to the observing station side, and an observing station telemeter receiver section 5 inputs a timing signal outputted at the reproduction of a reception data to a comparator circuit 6. The comparator circuit 6 compares a reference sample signal from a reference sample signal generating circuit 7 with a reception timing signal, obtains the difference and when it is discriminated that the said difference is not within a prescribed range, the difference is outputted to an observing station telemeter transmitter section 8 and transmitted to the observing point side. The data transmitted to the observing point side is outputted to the sample signal generating circuit 1 via an observing point telemeter receiver section 9, and the sample signal generating circuit 1 adjusts the generation of the sample signal by a time corresponding to this data value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a system synchronization method for adjusting data sample timing by remote control in order to synchronously record transmitted data.

(Background technology) In the conventional system synchronization method, a high-precision clock device is mounted on a device installed at an observation point where data is sampled.
Calibration was done using JY or NHK time signals to match the sampling timing.

Therefore, since it has a built-in clock device for sampling timing and a receiving function for calibration, it is expensive, and it has the disadvantage that it is not possible to correct ``differences'' when calibration cannot be performed.

(Problems to be solved by the invention) In order to solve these drawbacks, it is an object of the present invention to reproduce the reference sample signal of a sample signal generation circuit installed in a device installed at an observation station and the transmission data transmitted from an observation point. Compare the timing signal output at the time (the same timing signal as the data sample signal at the observation point),
If the difference exceeds a certain permissible w1 song, the "deviation ° value is corrected so that it matches the reference sample signal," and the "ambiguity" in data recording at the observatory is eliminated.
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This will be explained in detail below.

(Structure and operation of the invention) The attached drawing is a system diagram of a system synchronization method according to an embodiment of the invention. In the figure, 1 is a sample signal generation circuit, 2 is a telemeter transmission section, 3 is a modem, 4 is a modem, 5 is a telemeter reception section, 6 is a comparison circuit, 7 is a reference sample signal generation circuit, and 8 is a telemeter transmission section. The quantity section 9 is a telemeter receiving section.

To explain the operation, the observation point telemeter sending unit 2 samples data using the sample signal from the observation point sample signal generation circuit 1, and simultaneously transmits the data to the observation station side via the observation point modem 3. The data transmitted to the observatory side is received by the observatory telemeter receiving section 5 via the observatory modem 4. A timing signal output when reproducing received data is input to the comparison circuit 6. This timing signal has the same period as the sample signal at the observation point. On the other hand, a reference sample signal is input to the comparison circuit 6 from the reference sample signal generation circuit 7 of the observation station. The comparison circuit 6 compares the reference sample signal and the reception timing signal to determine the difference, and determines whether this difference is within a set range. When it is determined that the difference is not within a predetermined range, the value of the difference is output to the observatory telemeter transmission section 8 and further transmitted to the observation point side via the observatory modem 4. The data transmitted to the observation point side is received by the observation point telemeter receiving section 9 via the observation point modem 3.
Furthermore, it is output to the sample signal generation circuit 1. The sample signal generation circuit 1 adjusts the generation of the sample signal for a time corresponding to this data value. As described above, the data sampling timing at the observation point is adjusted by remote control to match the data sampling timing at the observation station.

As explained above, in the above embodiment, during data recording at the observation station, the reproduction timing signal of the data transmitted from the observation point is compared with the reference sample signal at the observation station,
When the value of the deviation exceeds a certain value, numerical control is applied to the observation point to correct the deviation.

By monitoring and comparing the reference sample signal at the observatory with the sample signal added to the reproduced data, it is possible to always record data without jitter, and it is possible to obtain results with good time accuracy in data analysis. It has the advantage of being

(Effects of the Invention) The present invention has the advantage of being able to synchronize the data sampling of the entire system, and therefore can be used in telemeter systems for earthquake and volcano observation, etc., which require time precision for data analysis.

[Brief explanation of the drawing]

The accompanying drawing is a system diagram of a system synchronization method according to an embodiment of the present invention. 1... Observation point sample signal generation circuit 2... Observation point telemeter sending section 3... Observation point modem 4... Observation station modem 5... Observation station telemeter receiving section 6... Comparison circuit 7...Reference sample signal generation circuit 8...Observation point telemeter sending section 9...Observation point telemeter receiving section Patent applicant Oki Electric Industry Co., Ltd. Patent application agent Patent attorney Megumi Yamaki -

Claims (1)

[Claims] In a system synchronization method for a telemeter system consisting of an observation point and an observation station that records data transmitted from the observation point, data is sampled using a sample signal from the observation point and the data is transmitted to the observation station. , Compare the reception timing of the data with a reference sample signal at the observation station, transmit the comparison result to the observation point, and adjust the timing of the sample signal at the observation point based on the comparison result. A system synchronization method characterized by: