JP2002288774A - Observation data recovery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an observation data recovery system that prevents an increase in the number of frequency channels and a resultant scale expansion of the structure of a center even if many observation devices are installed. SOLUTION: Observation point side radios 3a to 3m transmit observation data to the center according to individually allocated time schedules synchronized with time data and a reference timing signal generated by the reception of a radio wave from a GPS satellite. The center recovers each set of data, processes and stores the observation data on each observation point, and outputs the data out when necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an observation data collection system for collecting observation data at a plurality of observation points to a center by radio.

[0002]

2. Description of the Related Art Conventionally, in order to collect observation data of observation devices installed at a plurality of remote locations at a center, a pair of wireless devices are provided between the observation point and the center to establish a data link.

[0003] For example, in a system for collecting observation data such as a change in the core of the Earth, when the distance between the observation data collection center and each observation device is, for example, a long distance of several kilometers or more, data transmission is performed wirelessly. It is advantageous.

In general, in a system in which observation results of a plurality of observation devices are monitored at a remote place, a frequency channel is assigned to each observation device in order to establish a data link with each observation device.

FIG. 7 is a block diagram showing a configuration example of the observation data collection system in that case. Here, 1a to 1m are observation devices. The radio transmitters 10a to 10m transmit the results obtained by the observation devices 1a to 1m to the antenna 11a.
To 11 m, and wirelessly transmit on each channel of frequencies f1 to fm. The wireless receivers 13a to 13m
The data of each channel is received via the antennas 12a to 12m, and the data recovery processing device 14 recovers the data from each of the wireless receivers 13a to 13m and performs a predetermined process.

[0006]

However, when the observation area is wide and many observation devices are installed,
Frequency channels must be allocated in accordance with the number, and radio receivers must be provided in that number. The data collection processor must also have a port for receiving data from those many wireless receivers and a receiving antenna for each frequency channel. Furthermore, since many channels having different frequencies are used, radio wave interference is likely to occur, and the frequency band of the wireless device cannot be used effectively. Such a problem arises.

An object of the present invention is to provide an observation data collection system in which the number of frequency channels is not increased even when a large number of observation devices are installed, and the configuration of the center is simplified accordingly.

[0008]

SUMMARY OF THE INVENTION The present invention is a system for wirelessly collecting data of observation devices provided at a plurality of points to a center. A means for transmitting data from the center to the observation device-side radio device, and using a single frequency radio wave for the observation device side radio device and the center side radio device to perform GP
Means for performing data communication between each observation device and the center in synchronization with the time data by S or a periodic signal synchronized with the time data; means for collecting the observation data to the center according to the schedule; And a means for retrievably storing the data from outside via a communication line.

Further, the present invention provides means for transmitting data of a preset observation schedule or observation data collection schedule in each observation device from the observation device side radio to the center, an observation device side radio, and a center side radio. Means for performing data communication between each observation device and the center in synchronization with time data by GPS or a periodic signal synchronized with the time data by using one frequency radio wave in the machine, and transmitting the observation data to the center according to the schedule. There is provided a means for collecting and a means for processing the collected observation data so as to be retrievable from outside via a communication line.

As described above, each observation device wirelessly transmits observation data and schedule data in synchronization with GPS time data and a periodic signal synchronized with the time data, thereby using a single frequency channel. ,
Data can be sent from the number of observation devices corresponding to the number of time slots obtained by dividing the fixed period to the center. Even at the center side, it is not necessary to provide a plurality of wireless devices for each frequency channel, and even when a large number of observation devices are installed, the overall configuration can be small.

Further, according to the present invention, the means for performing data communication between each of the observation devices and the center is provided with a guard time in each time slot synchronized with GPS time data or a periodic signal synchronized with the time data. Shall be performed.

[0012] Thus, the difference in the propagation time of radio waves and the GPS
Even if there is a time output error, interference of radio waves transmitted from each wireless device is prevented, and the error rate of data communication is reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a positioning system according to an embodiment of the present invention will be described in order with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the entire observation data collection system. In FIG. 1, reference numerals 4a to 4m denote transmitting / receiving antennas for a data link with the center. One observation point includes an observation device 1, a GPS antenna 2, an observation point side radio 3, and a transmission / reception antenna 4.

Reference numerals 2a to 2m denote GPS antennas, and the observation point side radios 3a to 3m use these GPS antennas to transmit GPS signals.
Radio waves from the PS satellite are received, and time data and a reference timing signal are obtained to control transmission and reception timings. The observation point side radios 3a to 3m are connected to the observation devices 1a to 1
The observation data from m is transmitted wirelessly at a transmission time assigned in advance. This transmission time is synchronized with the GPS time.

The center includes a transmitting / receiving antenna 5, a GPS antenna 6, a center-side radio 7 and a data collection processing device 8.
Consists of The center-side wireless device 7 uses the GPS antenna 6 to
It receives radio waves from PS satellites, obtains time data and reference timing signals, and controls transmission and reception. In addition, the center-side wireless device 7
Data communication is performed between the plurality of observation point side wireless devices 3a to 3m according to a predetermined time schedule synchronized with the GPS time. The data collection processing device 8 processes observation data from each observation point received by the center-side wireless device 7 and stores the data. The stored data is output to the outside via a public line network or a dedicated line as needed, or via the Internet.

FIG. 2 is a block diagram of two configuration examples showing the configuration of the observation point side radio at the observation point in more detail. In the example shown in (A), in the wireless device 3, the GPS receiver 31 receives the GPS signal received by the GPS antenna 2.
Time data and a reference timing signal are generated based on a signal from the PS satellite, and output to the control unit 32. Receiver 34
Receives an observation schedule from the center, a collection schedule of observation data, and the like according to a predetermined time schedule, and provides it to the control unit 32. The control unit 32 manages the time schedule accurately from the time data and the reference timing signal. At the transmission time indicated in the observation data collection schedule, the observation data is output to the transmission unit. The transmitting unit 33 wirelessly transmits this. The reception-only antenna 4 'is used together with another transmission / reception antenna 4 to constitute a space diversity antenna during reception.

Similarly to the configuration shown in FIG. 2, the center-side radio 7 also includes a GPS receiving unit, a control unit, a transmitting unit, and a receiving unit, and transmits and receives data according to a time schedule synchronized with GPS time. Do.

In the example shown in FIG. 2B, the data of the observation schedule or the collection schedule of the observation data is preset in the setting unit 35. When the transmission time indicated in the observation data collection schedule is reached, the control unit 32
Output the observation data to the transmission unit. The transmitting unit 33 wirelessly transmits this. In addition, the transmission unit 33 wirelessly transmits data relating to the observation schedule or the collection schedule of observation data preset in the setting unit 35 to the center side in response to a request from the center side or at a predetermined timing.

FIG. 3 shows an example in which one second is divided into 25 to form 25 time slots. The number of divisions of this time slot can be changed according to the requirements of the system. A time slot is a minimum unit of transmission time that cannot be divided any further. When a transmission time of a different wireless device is assigned to each time slot, a guard time is required for each time slot. The guard time is provided for the purpose of preventing the interference of the radio waves transmitted from each wireless device and reducing the data communication error rate in consideration of the propagation time of the radio wave, the output error of the GPS time, and the like. Depending on the capacity of observation data, a plurality of time slots may be assigned as one block. In this case, the guard time in one block is not required, and the guard time is provided only at the break of the block.

[0020] Observation data requiring real-time performance is transmitted by allocating some time slot every second. Observation data that does not require real-time transmission is set to a date, time, minute, and second according to a higher-order time schedule, and is transmitted using an empty time slot. Thereby, the time of data communication is managed.

FIG. 4 is a block diagram of a circuit for generating an interrupt at a timing corresponding to a time slot in the wireless device 3 shown in FIG.

Here, the time data and reference timing signal generation unit 311 receives the radio wave of the GPS satellite, generates time data and a reference timing signal, and outputs the time data and the reference timing signal to the counter 321 of the control unit. The counter 321 counts the clock based on the GPS reference timing signal, and outputs the count value to the comparison circuit 322. The comparison circuit 322 compares the set value (preset value) with the count value and generates a time slot interrupt signal.

Next, FIG. 5 is a flowchart showing the processing procedure of the control unit in each observation point side radio. As shown in FIG. 5A, observation data output from the observation device is input to the control unit 32 shown in FIG. The input observation data is processed into data that can be transmitted wirelessly according to the observation data collection schedule.

As shown in FIG. 4, when an interrupt signal is generated in accordance with the observation data collection schedule, as shown in FIG. 5B, data that can be transmitted in a preset time slot becomes The data is output from the control unit 32 shown in (A) and (B) of FIG. 2 to the transmission unit 33 and wirelessly transmitted.

In the above example, the observation data is transmitted at the timing according to the observation data collection schedule. However, the observation data is input from the observation device at the timing according to the observation schedule and transmitted. You may do so.

FIG. 6 is a flowchart showing the contents of processing on the center side. FIG. 6A shows processing of the control unit in the center-side wireless device, which receives data transmitted from each observation-point-side wireless device for each time slot and sequentially outputs the data to the data collection processing device.

FIG. 6B is a flowchart showing the processing contents of the data collection processing device. The data of each observation point output from the center-side radio is processed and arranged for each observation point, and stored as data of each observation point. The stored data is output to the outside periodically or when a request from the outside is received.

[0028]

According to the present invention, each of the observation point side radio and the center side radio transmits the observation data according to the time data generated by the reception of the radio wave from the GPS satellite and the time schedule synchronized with the reference timing signal. Since radio transmission is performed to the center, it is possible to install observation points by the number of time schedules divided into a fixed period while using a single frequency channel. The center does not need to provide a plurality of radios and antennas for each frequency channel. Even if a large number of observation devices are installed, only a single radio and antenna for a single frequency channel need to be installed. It becomes a large-scale system configuration.
In addition, since operation on a single frequency channel is possible, the allocated radio waves can be used effectively.

Further, by transmitting the data of the observation schedule or the collection schedule of the observation data in each observation device from the center to the radio device on the observation device side, the collection of the observation schedule or the observation data is performed at the center that collects the observation data. The schedule can be determined, and highly accurate and efficient observation according to the observation purpose can be performed.

Further, by providing means for transmitting the data of the preset observation schedule or observation data collection schedule of each observation device from the observation device-side radio to the center, the observation schedule or the observation schedule of each observation device is provided. The data on the data collection schedule can be grasped on the center side, and there is no need to particularly provide a receiver in the radio on the observation device side, so that the overall configuration can be simplified and the cost can be reduced.

When data communication is performed between each of the observation devices and the center, the communication is performed by providing a guard time in each time slot synchronized with GPS time data or a periodic signal synchronized with the time data. Therefore, even if there is a difference in the propagation time of the data, an output error of the GPS time, or the like, there is no interference between the radio waves transmitted from the wireless devices, and the error rate of data communication is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of an observation data collection system.

FIG. 2 is a diagram showing two configuration examples of an observation point side wireless device;

FIG. 3 is a diagram showing an example of time slot allocation.

FIG. 4 is a block diagram showing a circuit for generating an interrupt signal at a timing according to a time slot;

FIG. 5 is a flowchart showing processing contents of a control unit in the observation point side wireless device;

FIG. 6 is a flowchart showing processing contents on the center side.

FIG. 7 is a block diagram showing the overall configuration of a conventional observation data collection system.

[Explanation of symbols]

 2-GPS antenna 4,5-Data communication antenna

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F073 AA01 AA19 AB02 AB12 BB01 BC02 CC01 DE01 GG01 GG08 5J062 AA08 AA13 CC07 5K067 AA11 BB27 CC04 EE12 EE71 GG01

Claims (3)

[Claims] A system for wirelessly collecting observation data from observation devices provided at a plurality of points to a center, wherein data of an observation schedule or a collection schedule of observation data at each observation device is transmitted from the center to the observation device side. Means for transmitting to the radio equipment, and using one frequency radio wave between the observation equipment side radio equipment and the center side radio equipment, synchronizing with time data by GPS or a periodic signal synchronized with the time data, between each observation equipment and the center. A means for performing data communication by means of: a means for collecting the observation data to a center in accordance with the schedule; and a means for processing the collected observation data and storing the data so that it can be retrieved from the outside via a communication line. Collection system. 2. A system for wirelessly collecting observation data of observation devices provided at a plurality of points to a center, wherein the data of a preset observation schedule or observation data collection schedule of each observation device is obtained by the observation device. Means for transmitting from the side radio to the center, and each observation device is synchronized with time data by GPS or a periodic signal synchronized with the time data using one frequency radio wave at the observation device side radio and the center side radio. Means for performing data communication between the server and the center; means for collecting the observation data to the center according to the schedule; means for processing the collected observation data and storing the data so that it can be retrieved from the outside via a communication line. Observation data collection system. 3. The means for performing data communication between each of the observation devices and the center performs the communication by providing a guard time in each time slot synchronized with time data by GPS or a periodic signal synchronized with the time data. The observation data collection system according to claim 1 or 2.