JPH02177744A - Telemetering system - Google Patents

Abstract

PURPOSE:To compensate a delay in satellite propagation in the case of applying sequential polling to a station to be monitored and to shorten the data collection time by providing a monitor station sending a polling signal to the station to be monitored without awaiting the end of data collection from the station to be monitored in the telemetering system for a satellite line. CONSTITUTION:A monitor station 1 sends a polling signal 6 to the station to be monitored 2. Then a polling signal 8 to the station to be monitored 3 is sent succeedingly without awaiting the arrival of a reply data 7 returned by the station to be monitored 2 to the polling signal 6. Similarly, the polling signal is sent to the station to be monitored 6. Thus, the total sum of the propagation delay (polling signal propagation delay 10+data signal propagation delay 11) in the station to be monitored 2 and the propagation delay (polling signal propagation delay 12+data signal propagation delay 13) in the station to be monitored 3 and the propagation delay time up to the succeeding station to be monitored 5 is not the series sum. Thus, the delay in the satellite propagation is compensated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a telemetering method for performing telemetering from a monitoring station to a plurality of monitored stations via a satellite line, and in particular, to This invention relates to a telemetering system with a polling function that minimizes the influence of propagation delays inherent in telemetering.

[Prior Art] FIG. 2 is a polling sequence chart in a conventional telemetering system. Note that the vertical axis indicates the time axis t at each station.

In the figure, 1 is a monitoring station, 2, 3.4 are 11 monitoring stations (
#1. #2. #3) and 5 are monitored stations (#N).

Next, 6 and 8 are polling signals from the monitoring station 1 to the monitored station 3 and 4, and 7 and 9 are data sent from the monitored stations 3 and 4 to the monitoring station I.

As shown in the figure, in the conventional telemetering method, the monitoring station polls each monitored station (station selection) - (
The sequence of data collection) - (station selection) - (data collection) was repeated to perform telemetering for all monitored stations.

By the way, when the monitoring station polls the monitored station and the monitored station sends data to the monitoring station in response, the satellite propagation delay (0.3 seconds + 0
．． 3 seconds = 0.6 seconds) occurs. Therefore, in the conventional telemetering method in which polling and data collection are sequentially repeated, an additional 0.6XN seconds are required to collect data for N stations.

[Problems to be solved] The conventional telemetering method described above sends polling signals to monitored stations in sequence, and waits for data collection from the monitored station to complete before polling the next monitored station. Since the signals were being sent out, satellite propagation delays were added in series, resulting in poor time efficiency.

The present invention has been made in view of the above problems, and is a telemetering system equipped with a polling function that prevents the propagation delay on the satellite from being directly applied to the selection and data collection sequence for each station and improves time efficiency. The purpose is to provide.

[Means for Solving the Problems] In order to achieve the above object, the telemetering method of the present invention provides a telemetering method for a satellite line in which a monitoring station sequentially polls a plurality of monitored stations to collect data. This configuration includes a monitoring station that sends out a polling signal without waiting for the completion of data collection from the monitored station.

By adopting this method, when data is collected by sequentially polling monitored stations, satellite propagation delays are compensated for, and data collection time is minimized.

[Example code] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a polling sequence chart in a telemetering method according to an embodiment of the present invention.

In the same figure, 10.12 is from the monitoring station 1 to the monitored station 2,
3 is the polling signal propagation delay that occurs when the polling signal reaches the monitoring station 1, and 11.13 is the response data propagation delay that occurs when the response data reaches the monitoring station 1 from the monitored stations 2 and 3.

In the above configuration, first, the monitoring station 1 sends out a polling signal 6 to the monitored station 2. Then, without waiting for the arrival of the response data returned from the monitored station 2 in response to the polling signal 6, the polling signal 8 is subsequently sent to the monitored station 3. Also, in the same way, the monitored station 5
It even sends a polling signal to the target.

As a result, the time required from the start of polling to the completion of data collection is not simply added in series. That is, in this example, the propagation delay at monitored station 2 (polling signal propagation delay 10 + data signal propagation delay 11), the propagation delay at monitored station 3 (polling signal propagation delay 12 + data signal propagation delay 13), and the following monitored The total propagation delay time up to station 5 will not be serially added.

Therefore, it is possible to realize a telemetering system that compensates for satellite propagation delays.

That is, the monitoring station polls the first monitored station among N stations, and the remaining (N-1
) All the polling signals for one cycle are sent and completed, and the polling that was performed sequentially is sent out one after another without waiting for the completion of data collection.

As a result, satellite propagation delays are no longer simply added together.

It should be noted that the present invention is not limited to the above embodiments, but includes various modifications within the scope of the gist. For example, in the embodiment described above, polling signals are sent to all monitored stations before the first data collection is completed.
It is also possible to have a configuration in which the monitored stations are divided into groups for several rounds, and the polling sequence chart and data collection in the boring method are performed together for each group, and finally the polling and data collection are performed for all stations.

[Effects of the Invention] As explained above, the present invention, when performing sequential polling from a monitoring station to monitored stations, sends a polling signal to each monitored station without waiting for response data to arrive from the monitored station. By continuing to send data at a constant frequency, satellite propagation delays that occur in each sequence are prevented from being added in series and time efficiency deteriorates. This has the effect of providing a telemetering method that can minimize the influence of propagation delays.

[Brief explanation of the drawing]

FIG. 1 shows a telemeter lead according to an embodiment of the present invention;
The figure shows polling and
This is a sequence chart. l: Monitoring station 2, 3.4: Monitored station (#1.#2.#3) 5
: Monitored station (#N) 6.8 : Polling signal 7.9 : Data 10.12 : Polling signal propagation delay 11.13 : Response data propagation delay

Claims (1)

[Claims] In the satellite line telemetering method, a monitoring station sequentially polls multiple monitored stations and collects data.
A telemetering system characterized in that the monitoring station sends a polling signal to the monitored station without waiting for completion of data collection from the monitored station.