JP2004272506A - Sensor data transmission system, and its observation station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor data transmission system transmitting data of a sensor provided in an observation station at a proper interval in response to a state of the data, a situation of another observation station, or the like, minimizing a circuit scale of the observation station, and reducing electric power consumption. <P>SOLUTION: The observation station sends the observed sensor data to a base station via a communication means under a data transmission condition set on the basis of a transmission condition setting signal. The base station analyzes the sensor data sent from the observation station, and it sends a transmission condition setting signal to the observation station via the communication means when it is necessary to change the data transmission condition on the basis of an analysis result. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sensor data transmission system for collecting data of a sensor provided in an observation station in a base station and performing centralized management in the base station, and an observation station device therefor.
[0002]
[Prior art]
Conventionally, data over a wide area, such as river water volume and water quality, has been detected by sensors at observation stations established in each area, and those data have been collected at base stations, and data has been centrally managed. A wide range of data is being grasped and countermeasures are being taken.
[0003]
For this purpose, it is necessary to transmit sensor data from each observation station to the base station. If the data transmission is performed at a fixed sampling cycle, the sampling cycle is set to the cycle required when data fluctuates. become. The transmission data during a period in which the data fluctuation is small is useless data having a small value, and becomes a problem in terms of transmission cost and the like as the number of observation stations increases.
[0004]
In Patent Literature 1, in an observation station that records a long-term change in measured values obtained by an analyzer arranged at a remote place distant from the installation location of a base station, measured values collected at predetermined time intervals are stored in a storage unit. . Then, the stored measured values are thinned out according to the rate of change, and the thinned out measured values are transmitted to the base station by data communication as measured value data, so that the sampled measured value data is efficiently and compactly formed. It is described to output.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-206105
[Problems to be solved by the invention]
In the conventional data management method of Patent Document 1, since a change in the data transmission interval and the like is performed in each observation station, a condition change such as setting of a threshold value and a transmission interval related to the change depends on the observation device. However, its expandability and flexibility are limited.
[0007]
In addition, since the data transmission conditions are determined by the observation station, a circuit device for making the determination is required, and the circuit scale of the observation station becomes large. Becomes larger. Therefore, it is not suitable for a power saving system.
[0008]
In particular, observation stations are installed in places where it is difficult to supply power from the outside, such as remote places or places with poor environmental conditions, and batteries or solar cell systems are often used as power sources, so power consumption is low. Being big is an important issue.
[0009]
Therefore, the present invention transmits the sensor data provided at the observation station to the base station at appropriate intervals according to the state of the data and the status of other observation stations, and minimizes the circuit size of the observation station. It is an object of the present invention to provide a sensor data transmission system capable of reducing power consumption and an observation station device therefor.
[0010]
[Means for Solving the Problems]
The sensor data transmission system according to claim 1, wherein the sensor data transmission system transmits sensor data of a sensor provided in at least one observation station to a base station via communication means,
The observation station transmits the observed sensor data to the base station via the communication unit under a data transmission condition set based on a transmission condition setting signal,
The base station analyzes the sensor data transmitted from the observation station, and when changing the data transmission condition based on the analysis result, transmits the transmission condition setting signal of the observation station via the communication unit. To the observation station.
[0011]
A sensor data transmission system according to a second aspect is the sensor data transmission system according to the first aspect, wherein the data transmission condition is a data transmission time interval.
[0012]
The sensor data transmission system according to claim 3 is the sensor data transmission system according to claim 1, wherein the observation station is driven by a power supply unit, the sensor, and power from the power supply unit, and a sensor from the sensor is provided. A control unit that fetches data, transmits the sensor data to the base station according to the data transmission condition, and receives the transmission condition setting signal from the base station.
[0013]
The observation station device according to claim 4, wherein the power supply unit is driven by power from the power supply unit, captures sensor data from a sensor, and transmits the sensor data to the outside via a communication unit in accordance with a data transmission condition, And a control unit that receives a transmission condition setting signal for setting the data transmission condition from the outside via the communication unit.
[0014]
An observation station device according to a fifth aspect is the observation station device according to the fourth aspect, wherein the data transmission condition is a data transmission time interval.
[0015]
The observation station device according to claim 6 is the observation station device according to claim 4, wherein the control unit is supplied with power from the power supply unit at all times, and satisfies a set data transmission condition, and A power-saving control unit that outputs a switch-on operation command signal when receiving at least a part of the transmission condition setting signal;
Power is supplied from the power supply unit when the switch-on operation command signal is output, a data collection unit that collects the sensor data,
Power is supplied from the power supply unit when the switch-on operation command signal is output, a main control unit that controls transmission of the sensor data collected by the data collection unit to the outside,
A receiving circuit that receives the transmission condition setting signal from the outside, a transmitting circuit that transmits the sensor data to the outside under the control of the main control unit, and at least a part of the receiving circuit includes a signal from the power supply unit. And a transmission control unit to which power is constantly supplied.
[0016]
The observation station device according to claim 7 is the observation station device according to claim 6, wherein the main control unit receives the transmission condition setting signal from the reception circuit, holds the transmission condition setting signal, and saves the transmission condition setting signal. The data control condition is set in a power control unit based on the transmission condition setting signal.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a sensor data transmission system and an observation station device of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 is a diagram showing a configuration of a sensor data transmission system according to the present invention, and FIG. 2 is a block diagram showing a configuration of a control unit of each observation station.
[0019]
In FIG. 1, a plurality of observation stations 10A to 10N are installed in a wide range. Each of the observation stations 10A to 10N may have the same configuration, or may have different sensors and the like.
[0020]
Regarding the observation station 10A (hereinafter, representatively referred to as the observation station 10), the control unit 11 controls the observation station, and controls the sensors 13 (13-1 to 13-1) via the sensor I / F 12. The sensor data from -3) is fetched.
[0021]
The sensor 13 is provided in various terminal devices. For example, when the sensor 13 is used as an underwater remote monitoring device in a buoy or a ship, the GPS (position, altitude, speed, direction), salt concentration, oxygen concentration, Temperature and the like become sensor data, and when used as a sewer remote monitoring device, the flow rate, temperature, water level, amount of sediment, etc. become sensor data. When used as an in-vehicle device for a vehicle or the like, sensor data includes GPS, a speed sensor, and a direction sensor.
[0022]
The observation station device provided in the observation station 10 may include the sensor 13, or the sensor 13 may be separately provided as an external element of the observation station device.
[0023]
The control unit 11 transmits sensor data to the outside (that is, the base station) via the antenna 14 and receives a required signal transmitted from the base station to the observation station.
[0024]
The battery 15 supplies power for operation to the control unit 11, and is configured to be charged by the solar cell 16. Observation stations are often installed in remote locations or places with poor environmental conditions, and use batteries 15 and solar cells 16 as power sources. Therefore, there are problems with their capacity and stable power supply. The quantity is required to be small.
[0025]
The DoPa network (registered trademark) 20 is a communication network using a wireless packet communication technique for performing data transmission between a plurality of observation stations 10A to 10N and a base station. This DoPa network 20 is suitable for transmitting sensor data of various sensors. However, this DoPa network 20 is merely an example, and as a communication network or a communication means between the plurality of observation stations 10A to 10N and a base station, other communication such as packet communication using a mobile phone or a satellite phone, data communication using a PHS, etc. Various types are available.
[0026]
The base station 30 receives sensor data from the plurality of observation stations 10A to 10N via the DoPa network 20, and sends various control signals necessary for the observation operation to the plurality of observation stations 10A to 10N. In addition, the base station 30 collects and analyzes sensor data from the plurality of observation stations 10A to 10N, and when it is necessary to notify a manager as a result of the analysis, the base station 30 transmits the sensor data to the manager via the Internet 40. The resident monitoring device 50 is notified of the observation station where the abnormality has occurred, the content of the abnormality, and the like. The monitoring device 50 may be a mobile phone owned by an administrator.
[0027]
The configuration of the base station 30 includes a management computer 32 connected to a LAN (local area network) 31, a router 33 for connecting the LAN 31 to the DoPa network 20, and a processing result of sensor data collected and analyzed by the computer 32. And a terminal adapter 34 for connecting to the Internet 40 for notifying the monitoring device 50 of the processing result of the sensor data in the computer 32.
[0028]
The computer 32 collects and analyzes the sensor data sent from each of the observation stations 10A to 10N, and processes the magnitude, rate of change, direction of change, and the like of the sensor data. Then, the processing result is printed on the printer 35, graphed and distributed on the Web, and mail distribution is performed when an alarm occurs in an emergency or an emergency.
[0029]
Further, the computer 32 changes the data transmission conditions set for each of the observation stations 10A to 10N to numerical values that are optimal for the monitoring target, according to the sensor data and the processing results.
[0030]
For example, when the sensor 13 of the observation station 10 detects the water level or the temperature, the sensor data transmission interval is shortened when the water level or the temperature approaches an abnormal value, and is increased when the water level or the temperature is a safe value. Alternatively, in the case of a speed sensor, the data transmission interval is changed in accordance with the speed, and is shortened at a high speed and long at a low speed. In the case of position data that is two-dimensional data, the data interval is shortened in a certain area (for example, an urban area), and is increased when the area escapes. Since the sensor data for determining the change of the data transmission condition can be obtained only for each data interval, the upper limit value of the data transmission interval may be set according to the predicted change value of the data to be monitored. .
[0031]
Thus, the base station 30 recognizes the situation of the observation station 10 based on the sensor data from the observation station 10. The base station 30 comprehensively judges the status of each of the observed observation stations 10, determines the optimum data transmission conditions for each observation station 10, and sets the optimum data transmission conditions for each observation station 10. To transmit a transmission condition setting signal for performing the transmission.
[0032]
The configuration of the control unit 11 of the observation station 10 is shown in FIG. 2, the control unit 11 includes a power saving control unit 110, a main control unit 120, a data collection unit 130, a transmission control unit 140, and a power switch 150.
[0033]
The power saving control unit 110 is constantly supplied with power from the battery 15, and the data transmission conditions of the sensor data are set based on the control from the main control unit 120. Various conditions for determining the amount of data to be transmitted, such as a data transmission interval and a data compression ratio, can be set as the data transmission conditions. In this embodiment, the data transmission condition is the data transmission interval. The case will be described.
[0034]
The power saving control unit 110 is provided with a clock unit that counts the data transmission interval, and measures the time of the data transmission interval set from the time when the sensor data is transmitted from the control unit 11 to the base station 30. And outputs a switch-on operation command signal for turning on the power switch 150 when the interval is measured. The power saving control unit 110 also outputs a switch-on operation command signal when the transmission control unit 140 receives a transmission condition setting signal from the base station 30 or a part thereof.
[0035]
The power switch 150 is turned on by a switch-on operation command signal. Thereby, the operating power is supplied from the battery 15 to the main control unit 120, the data collecting unit 130, and the sensor I / F 12, and the operating power is also supplied to the transmission circuit part of the transmission control unit 140. The receiving circuit of the transmission control unit 140 is always supplied with operating power and is in a reception standby state.
[0036]
The data collection unit 130 collects sensor data of the sensor 13 via the sensor I / F 12.
[0037]
The main control unit 120 controls the transmission control unit 140 to transmit the sensor data collected by the data collection unit 130 to the base station 30. Further, when receiving the transmission condition setting signal from base station 30, main control unit 120 sets data transmission conditions in power saving control unit 110 based on the transmission condition setting signal.
[0038]
The transmission control unit 140 has a receiving circuit unit that receives a transmission condition setting signal from the base station 30 and a transmission circuit unit that transmits sensor data to the base station 30 under the control of the main control unit 120. At least a part of the receiving circuit part detects the transmission condition setting signal transmitted from the base station 30 or a part thereof, and outputs the switch-on operation command signal from the power saving control unit 110. Is always supplied.
[0039]
The operation of the sensor data transmission system configured as described above will be described with reference to the flowchart of the observation station 10 in FIG. 3 and the flowchart of the base station 30 in FIG.
[0040]
In FIG. 3, when the flow of the observation station 10 is started, it is determined in step S101 whether the transmission timing of the sensor data has come. This transmission timing is determined to be the timing when the data transmission interval time is measured by the timing unit of the power saving control unit 110. If the transmission timing has not been reached, the process proceeds to step S105.
[0041]
In step S105, it is determined whether or not a transmission condition setting signal (transmission condition data) for changing the data transmission condition has been transmitted from the base station 30. When the transmission condition setting signal is sent, it is received by the receiving circuit of the transmission control unit 140. If the transmission condition setting signal has not been transmitted, the process proceeds to step S108, and returns to step S101 in the sleep state, that is, the power saving state in which the power switch 150 is turned off, or while maintaining the sleep state.
[0042]
Therefore, when the transmission timing is not reached and the transmission condition setting signal is not transmitted, the observation station 10 is on standby in the power saving operation.
[0043]
If it is determined in step S101 that the transmission timing has come, the wake state, that is, the normal power operation is set. At this time, the power switch 150 is turned on, and power is supplied to all components of the observation station 10 to be in an operable state.
[0044]
The sensor data detected by the sensor 13 is supplied to the data collection unit 130 via the sensor I / F 12 and collected. The collected sensor data is transmitted as a radio wave by the antenna 14 from the transmission circuit of the transmission control unit 140 under the control of the main control unit 120 (step S104).
[0045]
After the data transmission in step S104, when the transmission condition data is not transmitted from the base station 30 in step S105, the power switch 150 is turned off again in step S108, and the observation station enters a sleep state.
[0046]
On the other hand, referring to FIG. 4, when the base station operation is started, base station 30 monitors reception of sensor data from observation station 10 in step S201. Upon receiving the sensor data, the process proceeds to step S202, and the computer 32 analyzes the received sensor data.
[0047]
In step S203, the analysis result of the sensor data is distributed to the related department, and printing and other processes are performed.
[0048]
Then, in step S204, it is determined based on the analysis result of the sensor data whether it is necessary to change the conditions for transmitting the sensor data from each of the observation stations 10A to 10N. When there is no need to change the transmission conditions, the process returns to step S201.
[0049]
However, when it is determined in step S204 that it is necessary to change the sensor data transmission condition of a certain observation station 10, the process proceeds to step S205, and a predetermined transmission condition setting for setting the data transmission condition in the observation station 10 is performed. Send a signal. Then, the process returns to step S201.
[0050]
Referring again to FIG. 3, when a transmission condition setting signal is transmitted from base station 30, at least a part of the transmission condition setting signal is received by the receiving circuit of transmission control unit 140 to which power is constantly supplied. (Step S105). The receiving circuit notifies the power saving control unit 110 of the reception, and turns on the power switch 150. As a result, the operating power is supplied to all the component parts of the observation station 10 including the main control unit 120, and the normal power operation state is set (step S106).
[0051]
The received transmission condition setting signal is supplied to the power saving control unit 110 under the control of the main control unit 120, and the data transmission condition is updated from the old data transmission condition to the new data transmission condition. Thereafter, the sensor data is transmitted from the observation station 10 to the base station 30 according to the new data transmission condition.
[0052]
After the data transmission condition is changed in step S107, the process proceeds to step S108, where the power switch 150 is turned off again to enter the sleep state.
[0053]
【The invention's effect】
According to the present invention, the situation of the observation station is recognized by the base station based on the sensor data from the observation station, and the base station comprehensively determines the situation of each of the recognized observation stations, and for each observation station. Determine the optimal data transmission conditions and transmit to each observation station. Therefore, each observation station may have a simple function of simply collecting sensor data and transmitting data under predetermined conditions (eg, time intervals) regardless of the type of sensor. Further, since the change or increase in various applications is performed by the base station, the expandability of the applications can be expanded.
[0054]
Further, in each observation station, it is not necessary to determine the data transmission condition, the normal power operation is performed only at the time of data transmission or when the transmission condition is changed, and for many other times only the power supply to the limited circuit unit may be performed. Therefore, power saving is remarkably achieved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a sensor data transmission system according to the present invention.
FIG. 2 is a block diagram showing a configuration of a control unit of each observation station.
FIG. 3 is a flowchart of an observation station.
FIG. 4 is a flowchart of a base station.
[Explanation of symbols]
10 Observation station 11 Control unit 12 Sensor I / F
13 sensor 14 antenna 15 battery 16 solar cell 20 DoPa network 30 base station 31 LAN
32 Computer 33 Router 34 Terminal adapter 35 Printer 40 Internet 50 Monitoring device 110 Power saving control unit 120 Main control unit 130 Data collection unit 140 Transmission control unit 150 Power switch

Claims (7)

A sensor data transmission system for transmitting sensor data of a sensor provided in at least one observation station to a base station via communication means,
The observation station transmits the observed sensor data to the base station via the communication unit under a data transmission condition set based on a transmission condition setting signal,
The base station analyzes the sensor data transmitted from the observation station, and when changing the data transmission condition based on the analysis result, transmits the transmission condition setting signal of the observation station via the communication unit. And transmitting the data to the observation station. The sensor data transmission system according to claim 1, wherein the data transmission condition is a data transmission time interval. The observation station is a power supply unit, the sensor, and is driven by power from the power supply unit, captures sensor data from the sensor, transmits the sensor data to the base station according to the data transmission condition, and 3. The sensor data transmission system according to claim 1, further comprising: a control unit configured to receive the transmission condition setting signal from the base station. A power supply unit, driven by electric power from the power supply unit, captures sensor data from a sensor, transmits the sensor data to the outside via a communication unit according to a data transmission condition, and from the outside via the communication unit. A control unit for receiving a transmission condition setting signal for setting the data transmission condition. The observation station device according to claim 4, wherein the data transmission condition is a data transmission time interval. The control unit outputs a switch-on operation command signal when power from the power supply unit is constantly supplied and when the set data transmission condition is satisfied and at least a part of the transmission condition setting signal is received. Power saving control unit to
Power is supplied from the power supply unit when the switch-on operation command signal is output, a data collection unit that collects the sensor data,
Power is supplied from the power supply unit when the switch-on operation command signal is output, a main control unit that controls transmission of the sensor data collected by the data collection unit to the outside,
A receiving circuit that receives the transmission condition setting signal from the outside, a transmitting circuit that transmits the sensor data to the outside under the control of the main control unit, and at least a part of the receiving circuit includes a signal from the power supply unit. The observation station device according to claim 4, further comprising: a transmission control unit to which power is constantly supplied. The main control unit receives the transmission condition setting signal from the receiving circuit, holds the transmission condition setting signal, and sets the data transmission condition based on the transmission condition setting signal in the power saving control unit. The observation station apparatus according to claim 6, wherein

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