JP2022102922A - Water level detection system, water surface side device and water level detection method - Google Patents

Abstract

To achieve a water level detection system that enables detection of a change in water level in a halt period of halting processing for measuring the water level from a positioning signal of a positioning satellite.SOLUTION: A water level detection system comprises: a water surface side device 1; and a server device that detects a water level of a water surface on the basis of a positioning signal to be transmitted from the water surface side device 1. The water surface side device 1 comprises: a positioning signal reception unit 11 that receives a positioning signal to be transmitted from a positioning satellite; a communication unit 12 that communicates between the server device and the communication unit; an acceleration detection unit 21 that detects acceleration; a geomagnetic detection unit 22 that detects geomagnetism; and a processing unit 10. The processing unit 10 is configured to calculate a change in water level of the water surface on the basis of the detection result of the acceleration detection unit 21 and geomagnetic detection unit 22, and when the calculated change in water level of the water surface satisfies a predetermined condition, cause the positioning signal received by the positioning signal reception unit 11 to be transmitted to the server device by the communication unit 12.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a water level detection system for detecting a water level, a water surface side device, and a water level detection method.

Conventionally, there is known a technique of detecting a water level of a river, a lake, a dam lake, or an ocean based on a positioning signal received from a positioning satellite, and performing processing based on the detected result. For example, in Patent Document 1, a plurality of marine buoys that are distributed and moored on the sea surface and measure the height of the sea surface based on a positioning signal transmitted from a positioning satellite, and measurement values are obtained from each marine buoy. However, a tide level monitoring system including a ground station device for detecting an abnormality in the tide level based on the acquired measured value is disclosed.

Japanese Unexamined Patent Publication No. 2006-170920

In recent years, there has been an increasing demand for power saving, and power saving is also desired for the tide level monitoring system. However, if the marine buoy described in Patent Document 1 is provided with a pause period during which the process of measuring the water level from the positioning signal of the positioning satellite is suspended for the purpose of power saving, the water level is suspended in the pause period. It is difficult to detect the change in.

The present disclosure has been made in view of the above, and an object of the present invention is to obtain a water level detection system capable of detecting a change in the water level during a pause period in which the process of measuring the water level from the positioning signal of the positioning satellite is suspended. do.

In order to solve the above-mentioned problems and achieve the object, the water level detection system of the present disclosure is based on a water surface side device provided on a float floating on the water surface and a positioning signal transmitted from the water surface side device. It is equipped with a server device that detects. The water surface side device is a positioning signal receiving unit that receives a positioning signal transmitted from a positioning satellite, a communication unit that communicates with a server device, an acceleration detection unit that detects acceleration, and a geomagnetic detection that detects geomagnetism. A unit and a processing unit are provided. The processing unit calculates the change in the water level on the water surface based on the detection results of the acceleration detection unit and the geomagnetic detection unit, and when the calculated change in the water level on the water surface satisfies a predetermined condition, the positioning signal receiving unit determines the change. The received positioning signal is transmitted to the server device by the communication unit.

According to the present disclosure, it is possible to detect a change in the water level during a pause period in which the process of measuring the water level is suspended from the positioning signal of the positioning satellite.

The figure which shows an example of the structure of the water level detection system which concerns on Embodiment 1. The figure which shows an example of the structure of the water surface side apparatus which concerns on Embodiment 1. The figure which shows an example of the configuration of the server apparatus which concerns on Embodiment 1. A sequence diagram showing an example of a flow in which the water surface side device is shifted from the non-measurement mode to the measurement mode in the water level detection system according to the first embodiment. A flowchart showing an example of processing by the first processor of the water surface side device according to the first embodiment. A flowchart showing an example of positioning processing by the first processor of the water surface side device according to the first embodiment. A flowchart showing an example of processing by the second processor of the water surface side device according to the first embodiment. A flowchart showing an example of the water level change calculation process by the second processor of the water surface side device according to the first embodiment. A flowchart showing an example of processing by the processing unit of the server device according to the first embodiment. A flowchart showing an example of water level calculation processing by the processing unit of the server device according to the first embodiment. A flowchart showing an example of water level fluctuation confirmation processing by the processing unit of the server device according to the first embodiment. The figure which shows an example of the structure of the water level detection system which concerns on Embodiment 2. A flowchart showing an example of processing by the first processor of the water surface side device according to the second embodiment. A flowchart showing an example of processing by the second processor of the water surface side device according to the second embodiment. The figure which shows an example of the structure of the water level detection system which concerns on Embodiment 3.

Hereinafter, the water level detection system, the water surface side device, and the water level detection method according to the embodiment will be described in detail with reference to the drawings.

Embodiment 1.
FIG. 1 is a diagram showing an example of the configuration of the water level detection system according to the first embodiment. As shown in FIG. 1, the water level detection system 100 according to the first embodiment is from a water surface side device 1 provided on a float 5 floating on a water surface 4 such as a river, a lake, a dam lake, or an ocean, and a water surface side device 1. It includes a server device 2 that detects the water level of the water surface 4 based on the transmitted positioning signal. In the following, the water level of the water surface 4 may be simply referred to as a water level.

The water surface side device 1 and the server device 2 can transmit and receive information via a network (not shown). The network (not shown) is, for example, a network including a WAN (Wide Area Network) such as the Internet and a radio base station.

For example, when the water surface 4 is the water surface of a river, the water surface side device 1 is arranged at intervals from the upstream to the downstream. The number of water surface side devices 1 is one in the example shown in FIG. 1, but may be two or more. The position of the float 5 is restricted from moving by a pole or a wire, and the configuration including the water surface side device 1 and the float 5 can also be referred to as a buoy type device. The water surface side device 1 may be configured to include a float 5.

The water surface side device 1 receives a plurality of positioning signals transmitted from the plurality of positioning satellites 3. The positioning satellite 3 is a satellite of GNSS (Global Navigation Satellite System). The water surface side device 1 transmits a plurality of received positioning signals to the server device 2 via a network (not shown).

The server device 2 is built in the cloud environment 6. The cloud environment 6 includes computer resources provided in the cloud service platform. The cloud service platform is provided by a cloud service provider and includes, for example, PaaS (Platform as a Service). Since the server device 2 is built in the cloud environment 6, it may also be called a cloud server.

The server device 2 receives a plurality of positioning signals from the water surface side device 1 via a network (not shown). Further, the server device 2 receives error correction information for correcting an altitude error obtained from a plurality of positioning signals from a ground device (not shown). The error correction information is the same as the error correction information included in the error correction signal transmitted from the quasi-zenith satellite (not shown), and is the information for performing centimeter-class error correction. The quasi-zenith satellite is a QZSS (Quasi-Zenith Satellite System) satellite, and the error correction signal is also called a QZSS augmentation signal or an L6 signal.

The server device 2 calculates the current position of the water surface side device 1 based on the received plurality of positioning signals and error correction information. As a result, the server device 2 can accurately calculate the current position of the water surface side device 1 with a centimeter-class error. The current position of the water surface side device 1 is, for example, the latitude, longitude, and altitude of the water surface side device 1. The server device 2 calculates the water level based on the calculated position of the water surface side device 1. For example, the server device 2 calculates the difference between the altitude of the water surface side device 1 and the altitude of the reference position among the calculated current positions of the water surface side device 1 as the water level. The reference position is, for example, the top end of the embankment shown in FIG. 1, but may be other than the top end of the embankment.

The water surface side device 1 has a measurement mode and a non-measurement mode as operation modes. In the measurement mode, a plurality of positioning signals transmitted from a plurality of positioning satellites 3 are received and received during the water level detection period, which is a period in which the server device 2 performs water level detection processing using the positioning signal of the positioning satellite 3. This is an operation mode in which a transmission process of transmitting a plurality of positioning signals to the server device 2 is repeated. The non-measurement mode is an operation mode for detecting a change in the water level from acceleration and geomagnetism during a pause period in which the process of measuring the water level from the positioning signal of the positioning satellite 3 is suspended. The water surface side device 1 has an acceleration detection unit and a geomagnetic detection unit, and detects a change in the water level based on the detection results of the acceleration detection unit and the geomagnetism detection unit in the non-measurement mode.

In this way, the water surface side device 1 can detect a change in the water level without using a positioning signal. Therefore, the water surface side device 1 can detect the change in the water level during the pause period, which is the pause period in which the process of measuring the water level from the positioning signal of the positioning satellite 3 is paused. Hereinafter, the water surface side device 1 and the server device 2 will be described in more detail.

FIG. 2 is a diagram showing an example of the configuration of the water surface side device according to the first embodiment. As shown in FIG. 2, the water surface side device 1 according to the first embodiment includes a processing unit 10, a positioning signal receiving unit 11, a communication unit 12, an acceleration detection unit 21, and a geomagnetic detection unit 22. Further, the processing unit 10 includes a first processor 13 and a second processor 23. Although not shown, the water surface side device 1 includes, for example, a battery and a power generation device including a solar panel, and includes a processing unit 10, a positioning signal receiving unit 11, a communication unit 12, and an acceleration detection unit. The 21 and the geomagnetic detection unit 22 are operated by the electric power output from the battery. In addition, the battery is charged by the electric power generated by the power generation device.

The positioning signal receiving unit 11 receives a plurality of positioning signals transmitted from the plurality of positioning satellites 3. The communication unit 12 transmits / receives information to / from the server device 2 via a network (not shown) by wireless communication. The first processor 13 controls the positioning signal receiving unit 11 and the communication unit 12.

The positioning signal receiving unit 11 includes a receiving antenna (not shown) that receives a plurality of positioning signals transmitted from the plurality of positioning satellites 3 and a signal processing unit that processes a plurality of positioning signals received by the receiving antenna. .. The signal processing unit converts a plurality of positioning signals received by the receiving antenna into digital signals and outputs them to the first processor 13.

In the measurement mode, the first processor 13 periodically causes the positioning signal receiving unit 11 to receive a plurality of positioning signals transmitted from the plurality of positioning satellites 3. The first processor 13 outputs a plurality of positioning signals periodically received by the positioning signal receiving unit 11 to the communication unit 12, and transmits the plurality of positioning signals from the communication unit 12 to the server device 2 in the communication unit 12. To execute periodically. The measurement mode is executed when the first processor 13 is in the activated state.

Further, the first processor 13 is in a standby state in the non-measurement mode. In the standby state, the first processor 13 stops the transmission process of causing the positioning signal receiving unit 11 to receive a plurality of positioning signals and causing the communication unit 12 to transmit the plurality of positioning signals to the server device 2. When the first processor 13 is in the standby state, the power consumption of the processing unit 10 can be suppressed as compared with the case where the first processor 13 is in the activated state in which the transmission process is performed.

Further, when the first processor 13 receives the positioning start signal from the server device 2 by the communication unit 12 in the non-measurement mode, the first processor 13 shifts from the standby state to the activated state. Then, the first processor 13 causes the positioning signal receiving unit 11 to execute the reception processing of the plurality of positioning signals, acquires the plurality of positioning signals from the positioning signal receiving unit 11, and the server device 2 for the acquired plurality of positioning signals. The communication unit 12 is made to execute the transmission to.

When the server device 2 receives a plurality of positioning signals from the water surface side device 1 via a network (not shown) after transmitting the positioning start signal, the received plurality of positioning signals and the quasi-zenith satellite (not shown) or not shown are shown. The position of the water surface side device 1 is calculated based on the error correction information acquired from the ground device. The server device 2 transmits the calculated position information indicating the current position of the water surface side device 1 to the water surface side device 1 via a network (not shown).

When the position information transmitted from the server device 2 is received by the communication unit 12, the first processor 13 of the water surface side device 1 acquires the position information from the communication unit 12, and the acquired position information is used as the second processor. Output to 23. The first processor 13 outputs the position information to the second processor 23, and then shifts from the started state to the standby state.

As will be described later, the second processor 23 calculates the change in the water level, and when the calculated change in the water level satisfies a preset condition, the first processor 13 is shifted from the standby state to the activated state, and the second processor 23 is changed. The processor 13 of 1 is made to transmit a plurality of positioning signals to the server device 2 via the communication unit 12.

The first processor 13 shifts from the standby state to the activated state in response to the activation request from the second processor 23, and executes the positioning signal transmission process. In the positioning signal transmission process, the positioning signal receiving process is executed by the positioning signal receiving unit 11, the positioning signal is acquired from the positioning signal receiving unit 11, and the acquired positioning signal is transmitted to the server device 2 by the communication unit 12. It is a process to make it. After that, when the measurement mode start request from the server device 2 is received by the communication unit 12, the first processor 13 shifts the operation mode to the measurement mode. When the measurement mode start request from the server device 2 is not received by the communication unit 12 and the position information from the server device 2 is received by the communication unit 12, the first processor 13 uses the acquired position information as the second processor. After outputting to the processor 23, the state shifts from the started state to the standby state.

Further, when the operation mode is the measurement mode and the non-measurement mode start request from the server device 2 is received by the communication unit 12, the first processor 13 shifts the operation mode to the non-measurement mode.

The acceleration detection unit 21 detects the acceleration applied to the water surface side device 1. The geomagnetic detection unit 22 detects the geomagnetism. The second processor 23 is a processor having lower power consumption than the first processor 13. The second processor 23 executes the water level change calculation process when the operation mode of the first processor 13 is the non-measurement mode. The water level change calculation process is a process for calculating a change in the water level.

Further, when the operation mode of the first processor 13 is the measurement mode, the second processor 23 is in a standby state in which the water level change calculation process is not executed, and is consumed as compared with the case where the water level change calculation process is executed. The power is low.

The second processor 23 has a calculation unit 24 and a start processing unit 25. When the first processor 13 is in the standby state, the calculation unit 24 determines the change in water level based on the detection result by the acceleration detection unit 21 and the geomagnetic detection unit 22 and the position information acquired from the first processor 13. calculate.

For example, the calculation unit 24 repeatedly calculates the vertical movement amount of the water surface side device 1 based on the acceleration detected by the acceleration detection unit 21 and the geomagnetism detected by the geomagnetic detection unit 22. The calculation unit 24 calculates the water level by integrating the amount of movement in the highly vertical direction indicated by the position information acquired from the first processor 13.

The start processing unit 25 shifts the first processor 13 from the standby state to the start state when the change in the water level calculated by the calculation unit 24 satisfies a predetermined condition. The predetermined condition is, for example, a condition that the change in the water level is rapid, and a condition that the change in the water level per unit time set in advance is equal to or higher than a preset threshold value. When the change in the water level calculated by the calculation unit 24 satisfies a predetermined condition, the start processing unit 25 shifts the first processor 13 from the standby state to the start state, and then performs the above-mentioned positioning signal transmission process. To execute.

Further, the calculation unit 24 can also calculate the change in the water level instead of calculating the water level. In this case, the calculation unit 24 repeatedly calculates and calculates the vertical movement amount of the water surface side device 1 based on the acceleration detected by the acceleration detection unit 21 and the geomagnetism detected by the geomagnetic detection unit 22. The change in water level is calculated by integrating the amount of movement of the side device 1 in the vertical direction. When the change in the water level calculated by the calculation unit 24 satisfies a predetermined condition, the start processing unit 25 shifts the first processor 13 from the standby state to the start state, and then performs the above-mentioned positioning signal transmission process. Is executed by the first processor 13.

FIG. 3 is a diagram showing an example of the configuration of the server device according to the first embodiment. As shown in FIG. 3, the server device 2 according to the first embodiment includes a communication unit 30, a processing unit 31, and a storage unit 32. The communication unit 30 transmits / receives information to / from the water surface side device 1 via a network (not shown).

The communication unit 30 receives, for example, a positioning signal transmitted from the water surface side device 1 or error correction information transmitted from a ground device (not shown). The server device 2 may be configured to receive an error correction signal transmitted from the quasi-zenith satellite.

The processing unit 31 includes a control unit 33, a position calculation unit 34, a water level calculation unit 35, a water level fluctuation determination unit 36, and an information providing unit 37. The control unit 33 causes the communication unit 30 to transmit a measurement mode start request, a non-measurement mode start request, or a positioning signal transmission request to the water surface side device 1. The measurement mode start request is a request for shifting the operation mode of the water surface side device 1 from the non-measurement mode to the measurement mode.

The non-measurement mode start request is a request for shifting the operation mode of the water surface side device 1 from the measurement mode to the non-measurement mode. The positioning signal transmission request is a request for causing the water surface side device 1 in the non-measurement mode to transmit a positioning signal.

The position calculation unit 34 calculates the current position of the water surface side device 1 based on the plurality of positioning signals received by the communication unit 30 and the error correction information. The current position of the water surface side device 1 is, for example, the latitude, longitude, and altitude of the water surface side device 1.

The water level calculation unit 35 calculates the difference between the altitude of the water surface side device 1 calculated by the position calculation unit 34 and the altitude of the reference position as the water level. The reference position is, for example, the top end of the embankment shown in FIG. 1, but may be other than the top end of the embankment.

The water level fluctuation determination unit 36 determines whether or not the time change of the water level calculated by the water level calculation unit 35 satisfies a predetermined condition. The predetermined condition is, for example, a condition that the change in the water level is rapid, and a condition that the change in the water level per unit time set in advance is equal to or higher than a preset threshold value.

When the control unit 33 determines that the water level change satisfies a predetermined condition by the water level fluctuation determination unit 36, the control unit 33 causes the communication unit 30 to transmit the measurement mode start request to the water surface side device 1. As a result, the control unit 33 can cause the water surface side device 1 to execute a measurement mode in which the positioning signal is periodically transmitted to the server device 2.

Further, the control unit 33 causes the communication unit 30 to transmit the non-measurement mode start request to the water surface side device 1 when the water level is equal to or higher than the threshold value preset by the water level calculation unit 35. As a result, the control unit 33 can shift the operation mode of the first processor 13 of the water surface side device 1 from the measurement mode to the non-measurement mode.

The information providing unit 37 uses the communication unit 30 to provide position information indicating the current position of the water surface side device 1 calculated by the position calculation unit 34 based on the positioning signal from the water surface side device 1 to which the positioning signal transmission request is transmitted. It is transmitted to the side device 1.

Further, when the information providing request from the terminal device (not shown) is received by the communication unit 30, the information providing unit 37 causes the communication unit 30 to transmit the information in response to the information providing request to the terminal device. The information corresponding to the information provision request is, for example, the water level or the amount of change in the water level.

Next, the flow in which the water surface side device 1 shifts from the non-measurement mode to the measurement mode will be described. FIG. 4 is a sequence diagram showing an example of a flow in which the water surface side device is shifted from the non-measurement mode to the measurement mode in the water level detection system according to the first embodiment.

As shown in FIG. 4, the server device 2 transmits a positioning signal transmission request to the water surface side device 1 in the non-measurement mode (step S200). When the first processor 13 of the water surface side device 1 receives the positioning signal transmission request via the communication unit 12, it shifts from the standby state to the activated state (step S201), and positions the positioning signal transmitted from the positioning satellite 3. The signal receiving unit 11 receives the signal (step S202). The first processor 13 causes the server device 2 to transmit the positioning signal received by the positioning signal receiving unit 11 to the communication unit 12 (step S203).

The server device 2 calculates the current position of the water surface side device 1 based on the positioning signal received from the water surface side device 1 (step S204), and provides the calculated position information indicating the current position of the water surface side device 1 to the water surface side device 1. It is transmitted to 1 (step S205). When the first processor 13 of the water surface side device 1 receives the position information from the server device 2 via the communication unit 12, the first processor 13 outputs the received position information to the second processor 23 (step S206), and starts from the activated state. The state shifts to the standby state (step S207).

When the second processor 23 of the water surface side device 1 acquires the position information from the first processor 13, the second processor 23 calculates the change in the water level (step S208). In the process of step S208, the second processor 23 causes the acceleration detection unit 21 and the geomagnetism detection unit 22 to detect the acceleration and the geomagnetism, and the acceleration, the geomagnetism, and the position information detected by the acceleration detection unit 21 and the geomagnetism detection unit 22. The change in water level is calculated based on.

When the change in the water level satisfies a predetermined condition, the second processor 23 outputs a start request to the first processor 13 (step S209), and shifts the first processor 13 from the standby state to the start state. (Step S210). After the first processor 13 is activated, the positioning signal received from the positioning satellite 3 is received by the positioning signal receiving unit 11 (step S211), and the positioning signal received by the positioning signal receiving unit 11 is received by the server. The device 2 is made to transmit to the communication unit 12 (step S212).

The server device 2 calculates the current position of the water surface side device 1 based on the positioning signal received from the water surface side device 1 (step S213), and calculates the change in the water level based on the calculated current position of the water surface side device 1. (Step S214). In the process of step S214, the server device 2 calculates, for example, the difference between the current position of the water surface side device 1 calculated in step S204 and the current position of the water surface side device 1 calculated in step S213 as a change in the water level.

Further, when the processes of steps S211 and S212 are repeatedly executed in the first processor 13, the server device 2 repeatedly calculates the current position of the water surface side device 1 in step S213, and repeatedly calculates the water surface side device 1. It is also possible to calculate the change in water level based on the change in the current position.

When the server device 2 determines that the change in the water level satisfies a predetermined condition, the server device 2 transmits a measurement mode start request to the water surface side device 1 (step S215). When the first processor 13 of the water surface side device 1 receives the measurement mode start request from the server device 2 via the communication unit 12, the operation mode shifts from the non-measurement mode to the measurement mode. Then, the first processor 13 causes the positioning signal receiving unit 11 to receive the positioning signal transmitted from the positioning satellite 3 (step S216), and transmits the positioning signal received by the positioning signal receiving unit 11 to the server device 2. (Step S217) The process is executed at a preset cycle.

When the server device 2 determines that the change in the water level does not satisfy the predetermined condition, the server device 2 transmits the position information indicating the current position of the water surface side device 1 calculated in step 213 to the water surface side device 1. In this case, the first processor 13 of the water surface side device 1 outputs the position information received from the server device 2 to the second processor 23, and shifts from the started state to the standby state. The second processor 23 causes the acceleration detection unit 21 and the geomagnetism detection unit 22 to detect the acceleration and the geomagnetism, and the water level is based on the acceleration, the geomagnetism and the position information detected by the acceleration detection unit 21 and the geomagnetism detection unit 22. The water level change calculation process for calculating the change is restarted.

Subsequently, the processing by the first processor 13 of the water surface side device 1 will be described with reference to the flowchart. FIG. 5 is a flowchart showing an example of processing by the first processor of the water surface side device according to the first embodiment.

As shown in FIG. 5, the first processor 13 of the water surface side device 1 determines whether or not the positioning signal transmission request has been received by the communication unit 12 (step S1). When the first processor 13 determines that the positioning signal transmission request has been received (step S1: Yes), the first processor 13 executes the positioning process (step S2). The positioning process in step S2 is the process of steps S10 to S14 shown in FIG. 6, which will be described in detail later.

Next, when the process of step S2 is completed, or when it is determined that the positioning signal transmission request has not been received (step S1: No), the first processor 13 receives a start request from the second processor 23. It is determined whether or not there is (step S3). When the first processor 13 determines that there is a start request from the second processor 23 (step S3: Yes), the first processor 13 shifts from the standby state to the start state, causes the positioning signal receiving unit 11 to receive the positioning signal, and causes the positioning signal receiving unit 11 to receive the positioning signal. The positioning signal received by the positioning signal receiving unit 11 is transmitted to the server device 2 by the communication unit 12 (step S4). In the first processor 13, after the positioning signal is transmitted to the server device 2 by the communication unit 12, the measurement mode start request from the server device 2 is not received by the communication unit 12, and the position information from the server device 2 is communicated. When it is received by the unit 12, the acquired position information is output to the second processor 23, and then the state shifts from the activated state to the standby state.

When the process of step S4 is completed, or when it is determined that there is no start request from the second processor 23 (step S3: No), the first processor 13 receives the measurement mode start request by the communication unit 12. It is determined whether or not it is (step S5). When the first processor 13 determines that the measurement mode start request has been received (step S5: Yes), the first processor 13 shifts the operation mode from the non-measurement mode to the measurement mode and executes the measurement mode (step S6).

When the process of step S6 is completed, or when the first processor 13 determines that the measurement mode start request has not been received (step S5: No), has the non-measurement mode start request been received by the communication unit 12? It is determined whether or not (step S7). When the first processor 13 determines that the non-measurement mode start request has been received (step S7: Yes), the first processor 13 shifts the operation mode from the measurement mode to the non-measurement mode, and executes the non-measurement mode (step S8). When the process of step S8 is completed, or when it is determined that the non-measurement mode start request has not been received (step S7: No), the first processor 13 ends the process shown in FIG.

FIG. 6 is a flowchart showing an example of positioning processing by the first processor of the water surface side device according to the first embodiment. As shown in FIG. 6, the first processor 13 of the water surface side device 1 shifts from the standby state to the activated state (step S10), causes the positioning signal receiving unit 11 to receive the positioning signal, and the positioning signal receiving unit 11 receives the positioning signal. The received positioning signal is transmitted to the server device 2 by the communication unit 12 (step S11).

The first processor 13 acquires position information from the server device 2 (step S12) and outputs the acquired position information to the second processor 23 (step S13). Then, the first processor 13 shifts from the started state to the standby state (step S14), and ends the process shown in FIG.

Subsequently, the processing by the second processor 23 of the water surface side device 1 will be described with reference to the flowchart. FIG. 7 is a flowchart showing an example of processing by the second processor of the water surface side device according to the first embodiment.

As shown in FIG. 7, the second processor 23 of the water surface side device 1 determines whether or not the position information has been acquired from the first processor 13 (step S20). When the second processor 23 determines that the position information has been acquired (step S20: Yes), the second processor 23 executes the water level change calculation process (step S21). The water level change calculation process in step S21 is the process of steps S24 to S27 shown in FIG. 8, which will be described in detail later.

Next, the second processor 23 determines whether or not the change in the water level calculated in step S21 satisfies a preset condition (step S22). When the second processor 23 determines that the change in the water level does not satisfy the preset condition (step S22: No), the process shifts to step S21.

When the second processor 23 determines that the change in the water level satisfies the preset condition (step S22: Yes), the second processor 23 outputs a start request to the first processor 13 (step S23). As a result, the first processor 13 shifts from the standby state to the activated state, and causes the server device 2 to transmit the positioning signal acquired from the positioning signal receiving unit 11 by the communication unit 12. The second processor 23 ends the process shown in FIG. 7 when the process of step S23 is completed or when it is determined that the position information has not been acquired (step S20: No).

FIG. 8 is a flowchart showing an example of the water level change calculation process by the second processor of the water surface side device according to the first embodiment. As shown in FIG. 8, the second processor 23 acquires acceleration information indicating the acceleration detected by the acceleration detection unit 21 (step S24), and acquires geomagnetic information indicating the geomagnetism detected by the geomagnetic detection unit 22. (Step S25).

Next, the second processor 23 is the current position of the water surface side device 1 based on the position information acquired from the first processor 13, the acceleration information acquired in step S24, and the geomagnetic information acquired in step S25. Is calculated (step S26). The second processor 23 calculates the change in the water level per unit time based on the current position of the water surface side device 1 calculated in step S26 (step S27), and ends the process shown in FIG.

Subsequently, the processing by the processing unit 31 of the server device 2 will be described with reference to the flowchart. FIG. 9 is a flowchart showing an example of processing by the processing unit of the server device according to the first embodiment.

As shown in FIG. 9, the processing unit 31 of the server device 2 determines whether or not the water surface side device 1 is in the measurement mode (step S30). When the processing unit 31 determines that the water surface side device 1 is in the measurement mode (step S30: Yes), the processing unit 31 executes the water level calculation process (step S31). The water level calculation process in step S31 is the process of steps S40 to S45 shown in FIG. 10, and will be described in detail later.

When the processing unit 31 determines that the water surface side device 1 is not in the measurement mode (step S30: No), the processing unit 31 determines whether or not it is the water level fluctuation confirmation timing (step S32). The water level fluctuation confirmation timing is a timing that occurs in a preset cycle, for example, a timing that occurs every hour or every few hours. The water level fluctuation confirmation timing may be a timing in which the generation cycle becomes shorter as the water level measured by the processing unit 31 increases. The high water level means that the water level value becomes small when the water surface 4 is the water surface of the river and the reference position is the top end of the embankment.

When the processing unit 31 determines that it is the water level fluctuation confirmation timing (step S32: Yes), the processing unit 31 executes the water level fluctuation confirmation process (step S33). The water level fluctuation confirmation process in step S33 is the process of steps S50 to S59 shown in FIG. 11, and will be described in detail later.

When the processing of step S31 is completed, the processing of step S33 is completed, or it is determined that it is not the water level fluctuation confirmation timing (step S32: No), the processing unit 31 requests information provision from a terminal device (not shown). It is determined whether or not there is (step S34).

When the processing unit 31 determines that there is an information provision request (step S34: Yes), the processing unit 31 transmits the information corresponding to the information provision request to the terminal device (step S35). The information corresponding to the information provision request is, for example, the water level or the amount of change in the water level. When the processing of step S35 is completed or when it is determined that there is no information provision request (step S34: No), the processing unit 31 ends the processing shown in FIG.

FIG. 10 is a flowchart showing an example of the water level calculation process by the processing unit of the server device according to the first embodiment. As shown in FIG. 10, the processing unit 31 determines whether or not the positioning signal transmitted from the water surface side device 1 has been received by the communication unit 30 (step S40). When the processing unit 31 determines that the positioning signal has been received (step S40: Yes), the processing unit 31 acquires the error correction information transmitted from the ground device (not shown) and received by the communication unit 30 (step S41). When the server device 2 can receive the error correction signal from the quasi-zenith satellite (not shown), the processing unit 31 acquires the error correction information from the error correction signal from the quasi-zenith satellite.

The processing unit 31 calculates the current position of the water surface side device 1 based on the positioning signal and the error correction information received by the communication unit 30 (step S42). The processing unit 31 calculates the water level based on the position of the water surface side device calculated in step S42 (step S43).

When the processing of step S43 is completed or when it is determined that the positioning signal has not been received (step S40: No), the processing unit 31 determines whether or not the mode transition condition is satisfied (step S44). The mode transition condition is, for example, a condition that the water level is equal to or higher than a preset threshold value when the water surface 4 is the water surface of the river and the reference position is the top end of the embankment.

When the processing unit 31 determines that the mode transition condition is satisfied (step S44: Yes), the processing unit 31 causes the communication unit 30 to transmit a non-measurement mode start request (step S45). When the processing of step S45 is completed or when it is determined that the mode transition condition is not satisfied (step S44: No), the processing unit 31 ends the processing shown in FIG.

FIG. 11 is a flowchart showing an example of the water level fluctuation confirmation process by the processing unit of the server device according to the first embodiment. As shown in FIG. 11, the processing unit 31 causes the communication unit 30 to transmit a positioning start signal to the water surface side device 1 (step S50).

Next, the processing unit 31 acquires the positioning signal transmitted from the water surface side device 1 and received by the communication unit 30 from the communication unit 30 (step S51), and acquires error correction information in the same manner as in step S41 (step). S52). The processing unit 31 calculates the current position of the water surface side device 1 based on the positioning signal and the error correction information received by the communication unit 30 (step S53), and the position information indicating the calculated current position is used as the water surface side device 1. Is transmitted by the communication unit 30 (step S54).

Next, the processing unit 31 determines whether or not the positioning signal from the water surface side device 1 has been received by the communication unit 30 (step S55). When the processing unit 31 determines that the positioning signal has been received (step S55: Yes), the processing unit 31 calculates the current position of the water surface side device 1 based on the positioning signal and the error correction information received by the communication unit 30 (step S55: Yes). S56).

Next, the processing unit 31 calculates a change in the water level based on the current position of the water surface side device 1 (step S57). Then, the processing unit 31 determines whether or not the change in the water level calculated in step S57 satisfies a preset condition (step S58). When the processing unit 31 determines that the change in water level satisfies a preset condition (step S58: Yes), the processing unit 31 causes the communication unit 30 to transmit a measurement mode start request (step S59).

When the processing unit 31 finishes the process of step S59, determines that the positioning signal has not been received (step S55: No), or determines that the change in water level does not satisfy the preset condition (step S55: No). Step S58: No), the process shown in FIG. 11 is terminated.

The first processor 13 and the second processor 23 include, for example, one or more of a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a system LSI (Large Scale Integration). The first processor 13 and the second processor 23 include RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (registered trademark) (Electrically Erasable). Includes one or more of Programmable Read Only Memory).

The server device 2 may be composed of two or more servers. For example, the server device 2 may be composed of a processing server and a data server.

As described above, in the water level detection system 100 according to the first embodiment, the water level of the water surface 4 is based on the water surface side device 1 provided on the float 5 floating on the water surface 4 and the positioning signal transmitted from the water surface side device 1. It is provided with a server device 2 for detecting the above. The water surface side device 1 includes a positioning signal receiving unit 11 that receives a positioning signal transmitted from a positioning satellite 3, a communication unit 12 that communicates with the server device 2, an acceleration detection unit 21 that detects acceleration, and an acceleration detection unit 21. A geomagnetic detection unit 22 for detecting the geomagnetism and a processing unit 10 are provided. The processing unit 10 calculates a change in water level based on the detection results of the acceleration detection unit 21 and the geomagnetic detection unit 22, and when the calculated change in water level satisfies a predetermined condition, the positioning signal receiving unit 11 performs it. The received positioning signal is transmitted to the server device 2 by the communication unit 12.

Further, the processing unit 10 consumes more power than the first processor 13 and the first processor 13 that execute the transmission process of transmitting the positioning signal received by the positioning signal receiving unit 11 to the server device 2 by the communication unit 12. A second processor 23 with a low is provided. The second processor 23 includes a calculation unit 24 and a start processing unit 25. When the first processor 13 is in the standby state for stopping the transmission process, the calculation unit 24 calculates the change in the water level of the water surface 4 based on the detection results of the acceleration detection unit 21 and the geomagnetic detection unit 22. When the change in the water level of the water surface 4 calculated by the calculation unit 24 satisfies a predetermined condition, the start processing unit 25 shifts the first processor 13 from the standby state to the start state and performs the transmission process first. The processor 13 of the above is executed.

Further, the server device 2 detects the current position of the water surface side device 1 based on the error correction information transmitted from the quasi-zenith satellite (not shown) or the ground device (not shown) and the positioning signal transmitted from the water surface side device 1. Then, the position information, which is the detected current position information, is transmitted to the water surface side device 1. The first processor 13 acquires the position information transmitted from the server device 2 by transmitting the positioning signal to the server device 2 when shifting from the activated state to the standby state, and the acquired position information. Is output to the second processor 23. When the first processor 13 is in the standby state, the calculation unit 24 of the second processor 23 uses the detection results of the acceleration detection unit 21 and the geomagnetic detection unit 22 and the position information acquired from the first processor 13. Based on this, the change in water level is calculated. As a result, the water surface side device 1 of the water level detection system 100 can accurately detect the water level during the pause period during which the process of measuring the water level from the positioning signal of the positioning satellite 3 is suspended.

Further, the server device 2 includes a position calculation unit 34, a water level calculation unit 35, a water level fluctuation determination unit 36, and a control unit 33. The position calculation unit 34 detects the current position of the water surface side device 1 based on the positioning signal transmitted from the water surface side device 1. The water level calculation unit 35 calculates the water level based on the current position calculated by the position calculation unit 34. The water level fluctuation determination unit 36 determines whether or not the change in the water level 4 calculated by the water level calculation unit 35 satisfies a predetermined condition. When the water level fluctuation determination unit 36 determines that the water level change satisfies a predetermined condition, the control unit 33 causes the processing unit 10 to periodically transmit a positioning signal to the server device 2. As a result, the water level detection system 100 can accurately detect the water level during the pause period during which the process of measuring the water level from the positioning signal of the positioning satellite 3 is suspended.

Embodiment 2.
The water surface side device of the water level detection system according to the second embodiment compares the current position calculated by the positioning signal receiving unit with the current position calculated by the second processing unit, and based on the comparison result, the second It is different from the water surface side device 1 of the water level detection system 100 according to the first embodiment in that the current position calculated by the processing unit of the above is recalculated. In the following, the components having the same functions as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and the differences from the water level detection system 100 of the first embodiment will be mainly described.

FIG. 12 is a diagram showing an example of the configuration of the water level detection system according to the second embodiment. As shown in FIG. 12, the water level detection system 100A according to the second embodiment is different from the water level detection system 100 in that the water level side device 1A is provided in place of the water surface side device 1.

The water surface side device 1A is different from the water surface side device 1 in that the positioning signal receiving unit 11A and the processing unit 10A are provided in place of the positioning signal receiving unit 11 and the processing unit 10. The processing unit 10A differs from the processing unit 10 in that the processing unit 10A includes the first processor 13A and the second processor 23A in place of the first processor 13 and the second processor 23. The positioning signal receiving unit 11A differs from the positioning signal receiving unit 11 in that the current position of the water surface side device 1A is calculated based on a plurality of positioning signals transmitted from the plurality of positioning satellites 3.

In the non-measurement mode, the first processor 13A shifts from the standby state to the activated state in response to the first activation request from the second processor 23A, and executes the positioning signal transmission process. In the positioning signal transmission process, the positioning signal receiving unit 11A executes the receiving processing of a plurality of positioning signals, acquires a plurality of positioning signals from the positioning signal receiving unit 11A, and transmits the acquired plurality of positioning signals to the server device 2. Is a process of causing the communication unit 12 to execute the above.

Further, in the non-measurement mode, the first processor 13A shifts from the standby state to the boot state to perform positioning processing in response to the second start request from the second processor 23A, and then changes from the start state to the standby state. Transition. In the positioning process, the positioning signal receiving unit 11A calculates the current position of the water surface side device 1A based on a plurality of positioning signals transmitted from the plurality of positioning satellites 3, and the water surface side device 1A calculated by the positioning signal receiving unit 11A. This is a process of outputting the position information indicating the current position of the second processor 23A to the second processor 23A.

Further, in the non-measurement mode, the first processor 13A shifts from the standby state to the activated state in response to the third activation request from the second processor 23A, and executes the positioning signal transmission process described above.

The second processor 23A includes a calculation unit 24, a start processing unit 25A, and a comparison unit 26. When the first processor 13A is in the standby state, the calculation unit 24 changes the water level based on the detection result by the acceleration detection unit 21 and the geomagnetic detection unit 22 and the position information acquired from the first processor 13A. Is calculated.

When the change in the water level calculated by the start processing unit 25A and the calculation unit 24 satisfies the preset conditions, the first start request is output to the first processor 13A. Further, when the first processor 13A is in the standby state, the start processing unit 25A outputs a second start request to the first processor 13A at a preset cycle, and responds to the second start request. The position information output from the first processor 13A is acquired.

The comparison unit 26 of the second processor 23A compares the information of the current position of the water surface side device 1A output from the first processor 13A with the information of the current position calculated based on the acceleration and the geomagnetism. The comparison by the comparison unit 26 is performed for the altitude of the water surface side device 1A. The start processing unit 25A is the first processor 13A when the difference between the current position of the water surface side device 1A output from the first processor 13A and the current position calculated based on the acceleration and the geomagnetism is equal to or more than the threshold value. A third activation request is output to.

The positioning signal receiving unit 11A calculates the current position of the water surface side device 1A without using the error correction information. Therefore, the current position of the water surface side device 1A calculated by the positioning signal receiving unit 11A is less accurate than the current position of the water surface side device 1A calculated by the server device 2, but is calculated based on acceleration and geomagnetism. Higher than the accuracy of the current position. Therefore, the second processor 23A compares the current position of the water surface side device 1A output from the first processor 13A with the current position calculated based on the acceleration and the geomagnetism, based on the acceleration and the geomagnetism. It is possible to determine whether or not the calculated current position error is large.

The calculation unit 24 of the second processor 23A acquires the position information output from the first processor 13A in response to the third start request, and executes the water level change calculation process based on the acquired position information. As a result, when the error of the current position calculated based on the acceleration and the geomagnetism is large, the water surface side device 1A acquires the current position of the water surface side device 1A calculated by the server device 2 again to obtain the acceleration. It is possible to prevent the first activation request from being erroneously output to the first processor 13A due to the error of the current position calculated based on the geomagnetism.

Subsequently, the processing by the first processor 13A of the water surface side device 1A will be described with reference to the flowchart. FIG. 13 is a flowchart showing an example of processing by the first processor of the water surface side device according to the second embodiment. Since the processing of steps S60, S61, S69 to S72 in FIG. 13 is the same as the processing of steps S1, S2, S5 to S8 shown in FIG. 5, the description thereof will be omitted.

The first processor 13A of the water surface side device 1A determines whether or not the first activation request is output from the second processor 23A (step S62). When the first processor 13A determines that the first activation request has been output (step S62: Yes), the first processor 13A shifts from the standby state to the activation state, causes the positioning signal receiving unit 11A to receive the positioning signal, and receives the positioning signal. The positioning signal received by the unit 11A is transmitted to the server device 2 by the communication unit 12 (step S63).

When the process of step S63 is completed, or when the first processor 13A determines that the first start request has not been output (step S62: No), the second processor 23A issues a second start request. It is determined whether or not the output has been made (step S64). When the first processor 13A determines that the second activation request has been output (step S64: Yes), the first processor 13A causes the positioning signal receiving unit 11A to calculate the current position of the water surface side device 1A, and causes the current position of the water surface side device 1A to be calculated. Information is acquired from the positioning signal receiving unit 11A (step S65), and the acquired current position information is output to the second processor 23A (step S66).

When the process of step S66 is completed, or when the first processor 13A determines that the second start request has not been output (step S64: No), the second processor 23A issues a third start request. It is determined whether or not the output has been made (step S67). When the first processor 13A determines that the third activation request has been output (step S67: Yes), the first processor 13A executes the positioning process (step S68). The positioning process in step S68 is the same as the positioning process in step S2 shown in FIG. When the process of step S68 is completed, or when it is determined that the third start request has not been output (step S67: No), the first processor 13A shifts the process to step S69.

Subsequently, the processing by the second processor 23A of the water surface side device 1A will be described with reference to the flowchart. FIG. 14 is a flowchart showing an example of processing by the second processor of the water surface side device according to the second embodiment. Since the processing of steps S80, S81, and S90 in FIG. 14 is the same as the processing of steps S20, S21, and S22 shown in FIG. 7, the description thereof will be omitted.

When the water level change calculation process in step S81 is completed, the second processor 23A determines whether or not the position information acquisition timing has come (step S82). The position information acquisition timing is a timing that occurs in a preset cycle, for example, a timing that occurs every 10 minutes or every 30 minutes.

When the second processor 23A determines that the position information acquisition timing has come (step S82: Yes), the second processor 23A outputs a second start request to the first processor 13A (step S83). The second processor 23A acquires information on the current position of the water surface side device 1A output from the first processor 13A in response to the second start request (step S84).

Next, the second processor 23A compares the current position of the water surface side device 1A output from the first processor 13A with the current position of the water surface side device 1A calculated based on the acceleration and the geomagnetism (step S85). .. Then, in the second processor 23A, is the difference between the current position of the water surface side device 1A output from the first processor 13A and the current position of the water surface side device 1A calculated based on the acceleration and the geomagnetism equal to or more than the threshold value? It is determined whether or not (step S86).

When the second processor 23A determines that the difference is equal to or greater than the threshold value (step S86: Yes), the second processor 23A outputs a third activation request to the first processor 13A (step S87). Further, when the second processor 23A determines that the difference is not equal to or greater than the threshold value (step S86: No), or determines that the position information acquisition timing has not been reached (step S82: No), the process is performed in step S90. Move to.

When the second processor 23A determines that the change in the water level does not satisfy the preset condition (step S90: No), the process shifts to step S81. When the second processor 23A determines that the change in the water level satisfies the preset condition (step S90: Yes), the second processor 23A outputs the first start request to the first processor 13A (step S91). As a result, the first processor 13A shifts from the standby state to the activated state, and causes the communication unit 12 to transmit the positioning signal acquired from the positioning signal receiving unit 11A to the server device 2. The second processor 23A ends the process shown in FIG. 14 when the process of step S87 is completed and when the process of step S91 is completed.

As described above, the water level detection system 100A according to the second embodiment includes a water surface side device 1A, and the water surface side device 1A includes a positioning signal receiving unit 11A and a processing unit 10A. The positioning signal receiving unit 11A detects the current position of the water surface side device 1A based on the positioning signal transmitted from the positioning satellite 3. The processing unit 10A includes a first processor 13A and a second processor 23A. The second processor 23A includes a calculation unit 24, a start processing unit 25A, and a comparison unit 26. The start processing unit 25A periodically activates the first processor 13A and executes a process of outputting the information of the current position detected by the positioning signal receiving unit 11A to the second processor 23A to the first processor 13A. Let me. The comparison unit 26 of the second processor 23A compares the information of the current position detected by the positioning signal receiving unit 11A with the information of the current position calculated based on the acceleration and the geomagnetism. The start processing unit 25A shifts the first processor 13A from the standby state to the start state based on the comparison result by the comparison unit 26, and causes the first processor 13A to transmit the positioning signal from the communication unit 12. The information on the current position from the server device 2 is acquired again from the first processor 13A. The calculation unit 24 calculates the change in the water level based on the information of the current position acquired again from the first processor 13A and the detection results of the acceleration detection unit 21 and the geomagnetic detection unit 22. As a result, the water surface side device 1A of the water level detection system 100A can suppress that the error of the current position calculated based on the acceleration and the geomagnetism becomes too large, and measures the water level from the positioning signal of the positioning satellite 3. It is possible to accurately detect changes in the water level during the pause period during which the treatment is paused.

Embodiment 3.
The water level detection system according to the third embodiment is additionally provided with a process of detecting an abnormality in the position of the water surface side device, a process of detecting an impact applied to the water surface side device, a process of photographing the periphery of the water surface side device, and the like. In that respect, it differs from the water level detection system 100A according to the second embodiment. In the following, the components having the same functions as those of the second embodiment are designated by the same reference numerals and the description thereof will be omitted, and the differences from the water level detection system 100A of the second embodiment will be mainly described.

FIG. 15 is a diagram showing an example of the configuration of the water level detection system according to the third embodiment. As shown in FIG. 15, the water level detection system 100B according to the third embodiment is different from the water level detection system 100A in that the water level side device 1B and the server device 2B are provided in place of the water surface side device 1A and the server device 2. ..

The water surface side device 1B is different from the water surface side device 1A in that the processing unit 10B is provided instead of the processing unit 10A and the image pickup unit 14 is further provided. The processing unit 10B differs from the processing unit 10A in that the processing unit 10B includes the first processor 13B and the second processor 23B in place of the first processor 13A and the second processor 23A.

The image pickup unit 14 takes an image of the surroundings of the water surface side device 1B. The image pickup unit 14 includes an image pickup element and a lens such as a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor.

The first processor 13B acquires the position abnormality information indicating the position abnormality and the impact abnormality information indicating the impact generation detected by the second processor 23B from the second processor 23B, and the acquired position abnormality information and the impact abnormality information. Is transmitted to the server device 2B by the communication unit 12, and the image pickup information which is the information of the image captured by the image pickup unit 14 is transmitted to the server device 2B by the communication unit 12, which is different from the first processor 13A.

For example, in the non-measurement mode, the first processor 13B uses the information of the image captured by the image pickup unit 14 for a preset period from the time when the second processor 23B detects the position abnormality or the impact abnormality as the server device. It is transmitted to 2B by the communication unit 12.

Further, in the measurement mode, the first processor 13B uses, for example, information on an image captured by the image pickup unit 14 in a preset period before and after the time when an impact abnormality is detected by the second processor 23B as a server device. It is transmitted to 2B by the communication unit 12. In the measurement mode, the first processor 13B repeats the information of the image captured by the imaging unit 14 regardless of whether or not the impact abnormality is detected by the second processor 23B, and the communication unit to the server device 2B. It can also be transmitted by 12.

The second processor 23B includes a start processing unit 25B instead of the start processing unit 25A, an abnormality detection unit 27 for detecting a position abnormality of the water surface side device 1B, and an impact detection for detecting an impact applied to the water surface side device 1B. It differs from the second processor 23A in that it further includes a unit 28.

When the abnormality detection unit 27 detects a positional abnormality when the first processor 13B is in the non-measurement mode, the start processing unit 25B outputs a first start request to the first processor 13B, and further The position abnormality information indicating the position abnormality is output to the first processor 13B.

Further, when the impact detection unit 28 detects an impact abnormality when the first processor 13B is in the non-measurement mode, the activation processing unit 25B changes the first processor 13B from the standby state to the activation state, and causes the impact abnormality. The shock abnormality information indicating the above is output to the first processor 13B.

The abnormality detection unit 27 determines that a position abnormality has occurred in the water surface side device 1B when the current position of the water surface side device 1B detected by the positioning signal receiving unit 11A is out of the preset range. For example, when the latitude and longitude of the current position of the water surface side device 1B detected by the positioning signal receiving unit 11A are out of the preset range, the abnormality detection unit 27 causes a position abnormality in the water surface side device 1B. It is determined that it has been done. The abnormality detection unit 27 notifies the start processing unit 25B of the position abnormality information indicating the detected position abnormality.

The impact detection unit 28 detects the impact applied to the water surface side device 1B based on the acceleration detected by the acceleration detection unit 21 and the geomagnetism detected by the geomagnetic detection unit 22. The impact applied to the water surface side device 1B is, for example, an impact applied to the water surface side device 1B due to the roughness of the water surface 4 or an impact applied to the water surface side device 1B due to the collision of a suspended object.

The impact detection unit 28 detects that an impact abnormality has occurred when the detected impact is equal to or higher than a preset threshold value, and notifies the activation processing unit 25B of the impact abnormality information indicating the detected impact abnormality. The impact abnormality information includes the direction and magnitude of the impact applied to the water surface side device 1B.

The server device 2B includes a processing unit 31B instead of the processing unit 31. The processing unit 31B is different from the processing unit 31 in that the information providing unit 37B is provided in place of the information providing unit 37 and the abnormality detecting unit 38 is further provided.

The information providing unit 37B stores the position abnormality information, the impact abnormality information, and the imaging information transmitted from the water surface side device 1B and received by the communication unit 30 in the storage unit 32. The information providing unit 37B causes the communication unit 30 to transmit position abnormality information, impact abnormality information, and imaging information to a terminal device (not shown). Further, the information providing unit 37B transfers at least one piece of information of the position abnormality information, the impact abnormality information, and the imaging information stored in the storage unit 32 to the terminal device (not shown) in response to a request from the terminal device (not shown). It can also be transmitted by the communication unit 30.

When the communication unit 30 receives the position abnormality information, the abnormality detection unit 38 sets the current position of the water surface side device 1B calculated by the position calculation unit 34 based on the positioning signal received by the communication unit 30 in advance. When it is out of the set range, it is determined that a position abnormality has occurred in the water surface side device 1B. For example, when the latitude and longitude of the current position of the water surface side device 1B calculated by the position calculation unit 34 are out of the preset range, the abnormality detection unit 38 causes a position abnormality in the water surface side device 1B. Is determined. Since the abnormality detection unit 38 detects the position abnormality of the water surface side device 1B using the current position of the water surface side device 1B calculated by the position calculation unit 34, the position abnormality detected by the abnormality detection unit 27 is appropriate. It can be determined whether or not there is. When the information providing unit 37B determines that a position abnormality has occurred in the water surface side device 1B by the abnormality detecting unit 38, the information providing unit 37B sends the position abnormality information indicating the position abnormality detected by the abnormality detecting unit 38 to the terminal device (not shown). It can also be transmitted by the communication unit 30.

In the process of the water level detection system 100 according to the first embodiment, the process of detecting an abnormality in the position of the water surface side device 1, the process of detecting the impact applied to the water surface side device 1, and the periphery of the water surface side device 1 are included. Processing for imaging may be added.

As described above, the second processor 23B in the water surface side device 1B of the water level detection system 100B according to the third embodiment is connected to the water surface side device 1B based on the change in the current position detected by the positioning signal receiving unit 11A. Detect the abnormalities that occur. As a result, the water level detection system 100B detects that the water level device 1B is not in the specified position, for example, because the float 5 provided with the water surface side device 1B is stolen or flows out from a pole or a wire. be able to.

Further, the server device 2B is generated in the water surface side device 1B based on the change in the current position detected based on the error correction information transmitted from the quasi-zenith satellite or the ground device and the positioning signal transmitted from the water surface side device 1B. An abnormality detection unit 38 for detecting an abnormality is provided. As a result, the water level detection system 100B can accurately detect the positional abnormality of the water surface side device 1B.

Further, the second processor 23B includes an impact detection unit 28 that detects an impact applied to the water surface side device 1B based on the detection results of the acceleration detection unit 21 and the geomagnetic detection unit 22. As a result, the water level detection system 100B can detect the impact applied to the water surface side device 1B in real time. Therefore, for example, by notifying the administrator of the water level detection system 100B of the impact applied to the water surface side device 1B. Before the water surface side device 1B fails, the administrator of the water level detection system 100B can be alerted. As a result, the water level detection system 100B can take measures in advance to avoid a situation in which the water surface side device 1B fails and cannot be observed during heavy rain or the like.

Further, the water surface side device 1B includes an image pickup unit 14 that captures an image of the surroundings. The first processor 13B outputs the imaging information, which is the information of the image captured by the imaging unit 14, to the server device 2B. The server device 2B transmits the image pickup information output from the water surface side device 1B to the external device. This makes it easier for the manager of the water level detection system 100B to determine whether or not it is necessary to actually check the water surface side device 1B at the site.

The configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.

1,1A, 1B water surface side device, 2,2B server device, 3 positioning satellite, 4 water surface, 5 float, 6 cloud environment, 10,10A, 10B, 31,31B processor, 11,11A positioning signal receiver, 12 , 30 Communication unit, 13, 13A, 13B 1st processor, 14 Imaging unit, 21 Acceleration detection unit, 22 Geomagnetic detection unit, 23, 23A, 23B 2nd processor, 24 Calculation unit, 25, 25A, 25B Startup processing Unit, 26 Comparison unit, 27,38 Abnormality detection unit, 28 Impact detection unit, 32 Storage unit, 33 Control unit, 34 Position calculation unit, 35 Water level calculation unit, 36 Water level fluctuation determination unit, 37,37B Information provision unit, 100 , 100A, 100B Water level detection system.

Claims (11)

The water surface side device installed on the float floating on the water surface,
A server device for detecting the water level on the water surface based on a positioning signal transmitted from the water surface side device is provided.
The water surface side device is
A positioning signal receiver that receives positioning signals transmitted from positioning satellites, and
A communication unit that communicates with the server device,
Acceleration detector that detects acceleration and
The geomagnetic detector that detects the geomagnetism and the geomagnetism detector
The change in the water level on the water surface is calculated based on the detection results of the acceleration detection unit and the geomagnetic detection unit, and when the calculated change in the water level on the water surface satisfies a predetermined condition, the positioning signal receiving unit A water level detection system comprising: a processing unit for transmitting the positioning signal received by the server device to the server device by the communication unit. The processing unit
A first processor that executes a transmission process of transmitting the positioning signal received by the positioning signal receiving unit to the server device by the communication unit, and a second processor having lower power consumption than the first processor. , Equipped with
The second processor is
When the first processor is in a standby state for stopping the transmission process, a calculation unit that calculates a change in the water level on the water surface based on the detection results of the acceleration detection unit and the geomagnetic detection unit, and a calculation unit.
When the change in the water level on the water surface calculated by the calculation unit satisfies a predetermined condition, the first processor is shifted from the standby state to the activated state, and the transmission process is transferred to the first processor. The water level detection system according to claim 1, further comprising an activation processing unit to be executed. The server device is
The current position of the water surface side device is calculated based on the error correction information transmitted from the quasi-zenith satellite or the ground device and the positioning signal transmitted from the water surface side device, and the calculated current position information is used as the water surface. Send to the side device,
The first processor is
When shifting from the activated state to the standby state, the information of the current position transmitted from the server device is acquired from the communication unit by transmitting the positioning signal to the server device, and the acquired current position is acquired. Information is output to the second processor,
The calculation unit
When the first processor is in the standby state, the water level on the water surface is based on the detection results of each of the acceleration detection unit and the geomagnetic detection unit and the information of the current position acquired from the first processor. The water level detection system according to claim 2, wherein the change in the water level is calculated. The positioning signal receiving unit is
The current position of the water surface side device is detected based on the positioning signal transmitted from the positioning satellite, and the current position is detected.
The start processing unit is
The first processor is made to execute a process of periodically setting the first processor to the activated state and outputting the information of the current position detected by the positioning signal receiving unit to the second processor.
The second processor is
A comparison unit for comparing the current position information detected by the positioning signal receiving unit with the current position information calculated based on the acceleration and the geomagnetism is provided.
The start processing unit is
Based on the comparison result by the comparison unit, the server shifts the first processor from the standby state to the activation state and causes the first processor to transmit the positioning signal from the communication unit. The information on the current position from the device is acquired again from the first processor, and the information is obtained from the first processor.
The calculation unit
The claim is characterized in that the change in the water level on the water surface is calculated based on the information of the current position acquired again from the first processor and the detection results of each of the acceleration detection unit and the geomagnetic detection unit. 3. The water level detection system according to 3. The server device is
A position calculation unit that detects the current position of the water surface side device based on the positioning signal transmitted from the water surface side device, and a position calculation unit.
A water level calculation unit that calculates the water level on the water surface based on the current position calculated by the position calculation unit, and a water level calculation unit.
A water level fluctuation determination unit that determines whether or not a change in the water level on the water surface calculated by the water level calculation unit satisfies a predetermined condition, and a water level fluctuation determination unit.
When the water level fluctuation determination unit determines that the change in the water level on the water surface satisfies the predetermined condition, the control unit causes the processing unit to periodically transmit the positioning signal to the server device. The water level detection system according to any one of claims 1 to 4, wherein the water level detection system comprises. The server device is
It occurs in the water surface side device based on the change in the current position of the water surface side device detected based on the error correction information transmitted from the quasi-zenith satellite or the ground device and the positioning signal transmitted from the water surface side device. The water level detection system according to any one of claims 1 to 5, further comprising an abnormality detection unit for detecting an abnormality. The positioning signal receiving unit is
The current position of the water surface side device is detected based on the positioning signal transmitted from the positioning satellite, and the current position is detected.
The processing unit
The invention according to any one of claims 1 to 6, further comprising an abnormality detecting unit for detecting an abnormality occurring in the water surface side device based on the change in the current position detected by the positioning signal receiving unit. Water level detection system. The processing unit
The invention according to any one of claims 1 to 7, further comprising an impact detection unit that detects an impact applied to the water surface side device based on the detection result of the acceleration detection unit and the geomagnetic detection unit. Water level detection system. The water surface side device is
Equipped with an image pickup unit that captures the surroundings
The processing unit
The imaging information, which is the information of the image captured by the imaging unit, is output to the server device.
The server device is
The water level detection system according to any one of claims 1 to 8, wherein the image pickup information output from the water surface side device is transmitted to an external device. It is a water surface side device installed on a float that floats on the water surface.
A positioning signal receiver that receives positioning signals transmitted from positioning satellites, and
The communication unit that communicates with the server device and
Acceleration detector that detects acceleration and
The geomagnetic detector that detects the geomagnetism and the geomagnetism detector
The change in the water level on the water surface is calculated based on the detection result by the acceleration detection unit and the geomagnetic detection unit, and when the calculated change in the water level on the water surface satisfies a predetermined condition, the positioning signal receiving unit. A water level device comprising: a processing unit for transmitting the positioning signal received by the server device to the server device by the communication unit. The first step in which the water surface device provided on the float floating on the water surface receives the positioning signal transmitted from the positioning satellite, and
The second step in which the water surface side device transmits the positioning signal to the server device by the communication unit,
A third step in which the server device detects the water level on the water surface based on the positioning signal transmitted from the water surface side device.
Based on the detection result by the acceleration detection unit that detects the acceleration and the geomagnetism detection unit that detects the geomagnetism while the water surface side device has stopped the process of receiving the positioning signal and transmitting it to the server device. , The fourth step of calculating the change in the water level on the water surface, and
A fifth process in which the water surface side device receives the positioning signal and transmits it to the server device when the change in the water level on the water surface calculated by the fourth step satisfies a predetermined condition. A water level detection method characterized by including the steps of.

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