Wireless communication system, wireless line analysis device, and wireless line analysis method for wireless communication system

Abstract

To provide a wireless communication system, a wireless line analysis device, and a wireless line analysis method for the wireless communication system that are capable of shortening the period during which a system fault related to a wireless line is occurring and improving reliability.SOLUTION: A wireless communication system, in which a monitoring control device and a monitored device are connected via a wireless line, includes an uplink wireless line analysis device connected to the monitoring control device. The uplink wireless line analysis device has a first memory unit and a first control unit. The first control unit causes the monitoring control device to transmit, to the monitored device, a test signal transmission request signal that causes the monitored device to output a line test signal, stores desired wave electric field data information for an uplink and interference wave electric field data information for the uplink in the first memory unit, and determines a state of the uplink wireless line based on the desired wave electric field data information for the uplink and the interference wave electric field data information for the uplink.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a wireless communication system, a wireless line analysis device, and a wireless line analysis method for a wireless communication system. [Background technology]

[0002] Examples of wireless communication systems include telemetry systems and discharge warning systems. In a telemetry system that collects observation data, various data such as rainfall, water level, water quality, and wind speed are collected from multiple observation stations installed within a management area and sent to a monitoring station located in a dam management office or the like. In the discharge warning system, as stipulated by the River Act, when an emergency discharge is made from a dam or other facility, the monitoring and control station will issue voice broadcasts and other warnings using sirens and speakers at multiple discharge warning stations installed downstream of the dam to inform river users of the risk of rising river water levels.

[0003] The observation stations and discharge warning stations are mainly installed in mountainous areas, and in principle, the transmission path is wireless, using VHF (70 MHz band) or UHF (400 MHz band) radio frequency bands. Telemetry systems and discharge warning systems require stable operation even in bad weather or during disasters, so maintaining good quality wireless links is essential. However, due to the nature of wireless links, which propagate radio waves through outdoor spaces, it is extremely difficult to completely avoid line failures.

[0004] The quality of wireless lines can be degraded by external factors such as changes in the topography or environment along the propagation path, external waves with similar frequencies, inverter noise from peripheral devices, power supply switching noise, etc. When poor quality occurs as described above, it is difficult to identify the cause of the poor quality because the radio waves are widespread and invisible to the naked eye, and investigation and analysis can require a huge amount of time and human costs. In other words, when a system failure occurs due to poor quality of wireless lines, it may take a long time to restore the system, and during that time the operator is unable to operate the system stably, which causes problems in managing dams and rivers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-5077 A [Patent Document 2] JP 2018-71042 A [Patent Document 3] Japanese Patent Application Publication No. 10-40468 [Patent Document 4] JP 2003-242277 A [Patent Document 5] JP 2003-316704 A [Non-patent literature]

[0006] [Non-Patent Document 1] "Kokuden Tsushi No. 21 Standard Specifications for Telemetry Equipment (January 2001)", [online], [accessed July 24, 2023], Internet,<https: / / www.mlit.go.jp / tec / it / denki / kikisiyou / kokudenntsushi21zantei.pdf> [Non-Patent Document 2] "Kokuden Tsushi No. 54 Standard Specifications for Telemetry Devices (Autonomous Type) (July 2011)", [online], [accessed July 24, 2023], Internet,<https: / / www.mlit.go.jp / tec / it / denki / kikisiyou / kokudenntsushi54.pdf> [Non-Patent Document 3] "Kokuden Tsushi No. 27 Standard Specifications for Discharge Alarm Devices (September 2018)", [online], [accessed July 24, 2023], Internet,<https: / / www.mlit.go.jp / tec / it / denki / kikisiyou / kokudenntsushi27.pdf> [Non-Patent Document 4] "Kokuden Tsushi No. 22 Standard Specifications for 70MHz Band Radio Equipment (for Telemetering and Telecontrol) (July 2011)", [online], [accessed July 24, 2023], Internet,<https: / / www.mlit.go.jp / tec / it / denki / kikisiyou / kokudenntsushi22.pdf> [Non-Patent Document 5] "Kokuden Tsushi No. 23 Standard Specifications for 400MHz Band Radio Equipment (for Telemetering and Telecontrol) (July 2011)", [online], [accessed July 24, 2023], Internet,<https: / / www.mlit.go.jp / tec / it / denki / kikisiyou / kokudenntsushi23.pdf> Summary of the Invention [Problem to be solved by the invention]

[0007] The present embodiment provides a wireless communication system, a wireless line analysis device, and a wireless line analysis method for a wireless communication system, which can shorten the period during which a system failure related to a wireless line occurs and improve reliability. [Means for solving the problem]

[0008] A wireless communication system according to one embodiment is a wireless communication system in which a monitoring control device and a monitored device are connected via a wireless line, and includes an upstream wireless line analysis device connected to the monitoring control device, the upstream wireless line analysis device having a first memory unit that stores electric field information based on a signal received by the monitoring control device, and a first control unit that can output a signal to the monitoring control device, and the first control unit of the upstream wireless line analysis device causes the monitoring control device to transmit a test signal transmission request signal to the monitored device, causing the monitored device to output a line test signal, and stores in the first memory unit desired wave electric field data information for the upstream line, which is electric field data based on the line test signal received by the monitoring control device, and interference wave electric field data information for the upstream line based on a signal received by the monitoring control device during a period different from the reception period of the line test signal, and judges the state of the upstream wireless line based on the desired wave electric field data information for the upstream line and the interference wave electric field data information for the upstream line. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram illustrating an example of a wireless communication system according to an embodiment. [Diagram 2] FIG. 2 is a block diagram showing an example of the configuration of a wireless line analysis device. [Diagram 3] FIG. 3 is a sequence flow diagram showing the process of collecting data on the uplink line. [Figure 4] FIG. 4 is a sequence flow diagram showing the process of collecting data on the uplink line, following FIG. [Diagram 5] FIG. 5 is a diagram illustrating an example of data stored in the first storage unit. [Figure 6] FIG. 6 is a sequence flow diagram showing the process of collecting downlink data. [Figure 7] FIG. 7 is a sequence flow diagram showing the process of collecting data on the downlink, which follows FIG. [Figure 8] FIG. 8 is a diagram illustrating an example of data stored (accumulated) in the second storage unit. [Figure 9] FIG. 9 is a diagram showing an example of items set in the parameter / condition setting section. [Figure 10] FIG. 10 is a diagram showing an example of a setting screen displayed on the display unit. [Figure 11] FIG. 11 is a diagram showing an example of a menu display screen displayed on the display unit. [Figure 12] FIG. 12 is a diagram showing the display screen of "S / N trend." [Figure 13] FIG. 13 is a diagram showing the display screen for "Number of Defects Occurred." [Figure 14] FIG. 14 is a diagram showing the display screen for "missing data occurrence frequency." [Figure 15] FIG. 15 is a diagram showing a display screen when an alarm command is output. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. Note that the disclosure is merely an example, and any suitable modifications that a person skilled in the art can easily make while maintaining the gist of the invention are naturally included within the scope of the present invention. In addition, in this specification and each figure, elements similar to those described above with reference to the previous figures are given the same reference numerals, and detailed descriptions may be omitted as appropriate. Hereinafter, a wireless communication system according to an embodiment will be described in detail with reference to the drawings, taking a telemetry system and a dam discharge warning system as examples. Note that the telemetry system for collecting observation data and the dam discharge warning system for issuing warnings downstream when a relatively large amount of discharge, such as an emergency discharge, are systems with completely different purposes, so there may be cases where there is only a "telemetry system" or only a "discharge warning system," but there are also cases where both systems are constructed together. In either case, the present invention is applicable. In the following description, the telemetry system and the discharge warning system will be collectively referred to as the "telemetry discharge warning system."

[0011] FIG. 1 is a block diagram illustrating an example of a wireless communication system according to an embodiment. As shown in Fig. 1, the wireless communication system 1 (telemetry discharge warning system) is composed of a monitoring and control station 10 which is a master station, an observation station 20 having an observation device 21 which is a slave station of the telemetry system, and a discharge warning station 30 having a discharge warning device 31 which is a slave station of the discharge warning system. Note that for convenience of illustration, only one observation station 20 and one discharge warning station 30 are shown, but typically multiple stations are provided. Also, although both the observation station 20 and the discharge warning station 30 are shown in Fig. 1, only one of them may be provided.

[0012] Here, the parent station in the telemetry system is called a monitoring station, and the parent station in the discharge alarm system is called a monitoring control station, but in the following they will be collectively referred to as the monitoring control station 10. In addition, the observation device 21 in the telemetry system and the discharge alarm device 31 in the discharge alarm system are both devices monitored by the monitoring control device 11, so in the following they will be collectively referred to as the "monitored devices."

[0013] First, the telemetry system will be described. The telemetry system is a system for observing the amount of rainfall and the water level upstream of a river or a dam. In the telemetry system, data such as the amount of rainfall and the water level are collected at the timing of telemetry fixed-time observation (automatic observation at a predetermined set interval based on the top of the hour). For example, when the interval is set to 10 minutes from 10 o'clock, the monitoring control device 11 collects data from the observation device 21 at the timings of 10 o'clock, 10:10, 10:20, etc. The method of transmitting the observation data from the observation device 21 may be a method in which the observation device 21 transmits the data in response to a transmission request signal from the monitoring control device 11, or a method in which the observation device 21 is provided with a clocking function and the observation device 21 transmits the data spontaneously at a predetermined timing.

[0014] The monitor and control device 11 has a transmission control section 13 having a radio device 14 , a basic control section 15 connected to the transmission control section 13 , and a display section 16 . The transmission control unit 13 of the monitoring control device 11 collects data (such as water level and rainfall) observed by the observation device 21 via a wireless line.

[0015] The basic control unit 15 stores the data received from the observation device 21 in the monitoring device monitoring control device 11. Furthermore, the basic control unit 15 can display the collected data on the display unit 16. The display unit 16 is, for example, a liquid crystal display.

[0016] The observation device 21 provided at the observation station 20 has either a water level gauge 24 or a rain gauge 25, or both. Regarding the water level, the observation device 21 transmits water level data acquired from the water level gauge 24 to the monitoring control station 10 at a predetermined timing. Regarding the amount of rainfall, the rain gauge 25 transmits a pulse to the observation device 21 each time the amount of rainfall reaches a certain amount (for example, 1 mm), and the counter of the observation device 21 counts up by +1 each time the observation device 21 receives a pulse. For example, if the counter value at 12:00 is 200 and 5 mm of rainfall has fallen in 10 minutes, five pulses will be transmitted, so the counter value of the observation device will be 205. Then, at a predetermined timing (for example, 12:00), the counter value at this time (205 in the case of the child) is transmitted as rainfall data. The observation device 21 may include devices for measuring various data other than the water level gauge 24 and the rain gauge 25, such as a thermometer for measuring temperature and an anemometer for measuring wind speed.

[0017] Next, we will explain the discharge warning system. The discharge warning system is a system that notifies downstream river users of rising water levels when a larger amount of water than normal is discharged, such as in an emergency discharge from a dam, in order to avoid danger caused by rising water levels downstream.

[0018] When discharging water from a dam, the transmission control unit 13 of the monitoring and control device 11 transmits, via a wireless line, an instruction command to cause the discharge warning device 31 to issue a discharge warning using a speaker 34 or a siren 35. After that, when the transmission control unit 13 receives data from the discharge warning device 31 indicating the operation content carried out by the discharge warning device 31, the basic control unit 15 displays the operation content carried out by the discharge warning device 31 on the display unit 16. The discharge warning device 31 has a speaker 34 and a siren 35 that function as a warning unit. The discharge warning device 31 may have a warning unit other than the speaker 34 and the siren 35, and may have, for example, a rotating light that emits light or a display board that displays a discharge warning. In addition, the dam discharge warning system performs scheduled inspection control at any time.

[0019] Next, the wireless line common to both the telemetry system and the discharge alarm system will be described. Hereinafter, the "line from the observation station 20 to the monitoring control station 10" and the "line from the discharge warning station 30 to the monitoring control station 10" will be referred to as the "upstream lines", and the "line from the monitoring control station 10 to the observation station 20" and the "line from the monitoring control station 10 to the discharge warning station 30" will be referred to as the "downstream lines". Here, the radio signals transmitted and received between the monitoring control device 11 and the observation device 21, and the radio signals transmitted and received between the monitoring control device 11 and the discharge warning device 31 are transmitted and received via radio lines in the 70 MHz band or the 400 MHz band.

[0020] The monitoring and control station 10 has an antenna 12 and a wireless device 14. Similarly, the observation station 20 has an antenna 22 and a wireless device 23, and the discharge warning station 30 has an antenna 32 and a wireless device 33. Next, a radio line analysis device for analyzing the state of a radio line will be described. The wireless line analyzer 41 can be connected to each of the monitoring control station 10, the observation station 20, and the discharge warning station 30, and may have the same configuration or may have a configuration that is appropriately changed depending on the connection destination. The wireless line analysis device connected to the monitoring control station 10 is referred to as the "wireless line analysis device 41a for monitoring control station" or the "upstream wireless line analysis device 41a." The wireless line analysis device connected to the observation station 20 is referred to as the "wireless line analysis device 41b for observation device." The wireless line analysis device connected to the discharge warning station 30 is referred to as the "wireless line analysis device 41c for warning station." Furthermore, the wireless line analysis device 41b for observation device and the wireless line analysis device 41c for warning station are collectively referred to as the "downstream wireless line analysis devices 41b, 41c."

[0021] Moreover, the wireless line analyzer 41a for the monitoring control station, the wireless line analyzer 41b for the observation device, and the wireless line analyzer 41c for the alarm station are also collectively referred to simply as the "wireless line analyzer 41." Hereinafter, in the explanation of the internal configuration of the wireless line analyzer, when the explanation is common regardless of the connection destination, only numerical references are used, and when an explanation according to the connection destination is necessary, a, b, or c is added to the reference part number as described above to distinguish them.

[0022] A printing unit 51 and a display unit 52 are connected to the upstream radio line analysis device 41a connected to the monitor control station 10. In one example, the printing unit 51 is a printer, and the display unit 52 is a display.

[0023] The detailed configuration of the wireless line analysis device will be described below. Fig. 2 is a block diagram showing an example of the configuration of the wireless line analysis device 41. In Fig. 2, in addition to the wireless line analysis device 41, the monitoring control device 11 and the monitored device (the observation device 21 or the discharge warning device 31) to which the wireless line analysis device 41 is connected are also shown.

[0024] As shown in FIG. 2, the wireless line analysis device 41 includes an IF (interface) unit 43, a control unit 44, a storage unit 45, a parameter / condition setting unit 46, a display control unit 47, and a print control unit 48. The IF unit 43 includes a LAN terminal 431, a terminal 432, a terminal 433, a terminal 434, and a terminal 435. The terminals used in the IF unit 43 differ between the upstream radio line analysis device 41a and the downstream radio line analysis devices 41b and 41c.

[0025] The LAN terminal (431) is a terminal used when used as the upstream radio line analyzer 41a, and is a terminal connectable to the LAN terminal (611) of the monitor and control device 11 (610). The terminal (432) is a terminal used by both the uplink radio line analysis device 41a and the downlink radio line analysis devices 41b, 41c, and is a terminal connected to an RX level terminal (621) of one of the radio devices 14, 23, 33. The radio devices 14, 23, 33 (620) always output an RX level from the RX level terminal (621) according to the strength of the radio wave to be received, and the terminal (432) can acquire the received electric field voltage received by the radio devices 14, 23, 33 (620) from the RX level terminal (621).

[0026] The terminal (433) is a terminal used when used as the downstream wireless line analyzers 41b and 41c. The terminal (433) is a terminal that receives a control signal from a monitored device (e.g., a water level gauge 24 or a rain gauge 25) that corresponds to a BCD signal, and outputs information in the BCD format to the monitored device (630). Furthermore, the terminal (434) is a terminal for outputting an analog signal (voltage) to the monitored device (640). Furthermore, the terminal (435) is a terminal for outputting a digital signal (voltage) to the monitored device (640).

[0027] Next, the control unit 44 will be described. Hereinafter, the "control unit 44 in the upstream radio line analysis device 41a" will also be referred to as the "first control unit 44a," and the "control units 44 in the downstream radio line analysis devices 41b, 41c" will also be referred to as the "second control units 44b, 44c." The control unit 44 has a timer unit 441 , a communication control unit 442 , and a condition comparison and determination unit 443 . The timer unit 441 can control the timing of outputting an instruction command from the wireless line analysis device 41 to the monitoring control device 11 or the monitored device. The timer unit 441 can also control the timing and period of acquiring information from the RX level terminals of the wireless devices 14, 23, and 33. The above-mentioned timing and period can be set by the parameter / condition setting unit 46, which will be described later.

[0028] The communication control unit 442 can output instruction commands for controlling the wireless devices 14, 23, and 33 from the wireless line analysis device 41 to the monitoring control device 11 or the monitored device. For example, the upstream wireless line analysis device 41a can control the wireless device 14 of the monitoring control device 11 by the instruction command from the communication control unit 442a and transmit a predetermined instruction command to the wireless devices 23 and 33 of the monitored device (the observation device 21 or the discharge warning device 31).

[0029] The condition comparison and judgment unit 443 can judge the state of the wireless line by comparing the calculated signal-to-noise ratio with a predetermined allowable range. The above-mentioned predetermined allowable range can be set by the parameter and condition setting unit 46, which will be described later. The set allowable range is stored in the storage unit 45. In one example, the condition comparison and judgment unit 443 judges that the state of the wireless line is good when the signal-to-noise ratio falls within the allowable range, and judges that the state of the wireless line is poor when the signal-to-noise ratio does not fall within the allowable range.

[0030] Next, the storage unit 45 will be described. Hereinafter, the "storage unit 45 in the upstream wireless line analysis device 41a" will also be referred to as the "first storage unit 45a," and the "storage unit 45 in the downstream wireless line analysis devices 41b, 41c" will also be referred to as the "second storage unit 45b, 45c." The storage unit 45 includes a collected data storage unit 451 and a determination result storage unit 452 . The collected data storage unit 451 stores (accumulates) information acquired by the wireless line analysis device 41 from the RX level terminal. At this time, the control unit 44 can store the acquired information in the collected data storage unit 451 in association with information such as date and time, station, missing information, and desired wave / interference wave. The state of the wireless line determined by the condition comparison and determination unit 443 is stored (accumulated) in the determination result storage unit 452. At this time, the control unit 44 can store information on the determined state in the determination result storage unit 452 in association with a date and time.

[0031] The parameter / condition setting unit 46 has a parameter setting unit 461, a judgment condition setting unit 462, and a display / output cycle setting unit 463. The parameter / condition setting unit 46 can set various parameters and conditions related to the operations performed by the wireless line analysis device 41 and the data to be acquired by the operator through an operation unit (not shown). For example, the parameter setting unit 461 can set the observation time and acquisition frequency when acquiring information from the RX level terminals of the wireless devices 14, 23, and 33. In addition, the parameter setting unit 461 can set the terminal numbers of the IF unit 43 connected to the supervisory control device (control device) (610) and the monitored device (external device) (630).

[0032] The judgment condition setting unit 462 can set an allowable range for judging whether the state of the wireless line is good or not. Furthermore, the judgment condition setting unit 462 can set a failure occurrence frequency threshold for judging whether the state of the wireless line is abnormal or not. The failure occurrence frequency threshold is a threshold for the number of times that the calculated S / N ratio does not fall within the allowable range. The failure occurrence frequency threshold is, for example, five times in one day or two times in six hours. The display / output cycle setting unit 463 can set the cycle of information to be displayed on the display unit 52 via the display control unit 47 and information to be printed by the printing unit 51 via the printing control unit 48. For example, it is possible to display the number of defects occurring per day, or the number of defects occurring per week. The wireless communication system 1 is configured as described above.

[0033] <Uplink radio analysis operation> Next, the procedure for collecting data by the wireless line analysis device will be described. First, the procedure for collecting data on the uplink will be described using an example in which the monitored device is an observation device 21 (telemetry system). The received input voltage measurement for checking the wireless line status is performed an arbitrary set time (minutes) after the periodic control specified for operation so as not to affect the original system operation. Here, the periodic control specified for operation means telemeter fixed-time observation (automatic observation based on the top of the hour and performed at a set interval) in the case of a telemetry system, and means fixed-time inspection control operation performed at a set time, for example, about once a day, in the case of a discharge alarm system.

[0034] Fig. 3 is a sequence flow diagram showing the process of collecting the received input voltage measurement data of the desired wave of the uplink line. Fig. 4 is a sequence flow diagram showing the process of collecting the received input voltage measurement data of the uplink line, following Fig. 3. As shown in FIG. 3, in step S1a, first, the first control unit 44a of the upstream radio line analysis device 41a outputs a line test signal transmission request signal to the basic control unit 15 of the monitoring control device 11 at a timing that is a predetermined time after a periodic control time that is operationally specified as a telemetry system. Next, in step S2a, upon receiving the test signal transmission request signal, the basic control unit 15 of the monitor and control device 11 transmits a line test signal request signal from the radio device 14 to the radio device 23 of the observation device 21.

[0035] Next, in step S3a, when the radio equipment 23 of the observation device 21 receives the test signal transmission request signal, the radio equipment 23 outputs a predetermined line test signal. Next, in step S4a, when the monitoring control device 11 receives a line test signal transmitted from the monitored device, it outputs the received electric field level based on the signal received from the RX level terminal (hereinafter referred to as "desired wave electric field data for the uplink line") to the uplink wireless line analysis device 41a. Here, the desired wave electric field data information of the uplink is electric field data and input voltage of the line test signal received by the radio device 14. The desired wave electric field data information includes a plurality of electric field data, and in one example, the unit of the electric field data output from the RX level terminal is "V". In step S5a, the first control unit 44a of the uplink radio line analysis device 41a converts the unit of the electric field data in the output desired wave electric field data information of the uplink line from "V" to "dBμV".

[0036] The uplink wireless line analysis device 41a (first control unit 44a) determines a representative value of the multiple data of the acquired desired wave electric field data information (hereinafter referred to as the "representative value of the desired wave electric field data information"). The representative value is determined according to the setting of the parameter / condition setting unit 46, and is, for example, the average value or median value of the multiple data. In step S6a, the first control unit 44a of the upstream wireless line analysis device 41a inquires of the basic control unit 15 as to whether or not the latest observation data (such as water level and rainfall) has been obtained from the observation device 21 through regular telemeter observation. In step S7a, the basic control unit 15 of the monitoring control device 11 outputs information in which the missing data information has been added to the representative value of the desired electric field data information to the upstream wireless line analysis device 41a. The missing data information is information indicating whether or not an observation value has been acquired from the monitoring control device 11 or the monitored device, and in telemeter regular observation, if the monitoring control device 11 has acquired (received) data detected by the water level gauge 24 or rain gauge 25 of the observation device 21, the missing data information becomes "normal", and if it has not acquired (received) the data, the missing data information becomes "missing".

[0037] Thereafter, in step S8a, the first control unit 44a of the upstream wireless line analysis device 41a stores (preserves) the representative value of the desired wave electric field data information, the date, the station number, the desired wave / interference wave, and the missing information in the collected data storage unit 451a of the first storage unit 45a. Through the above-mentioned steps S1a to S8a, the upstream wireless line analysis device 41a can obtain information (desired wave electric field data) related to the desired wave in the upstream line.

[0038] Next, a procedure for acquiring information about interference waves will be described with reference to FIG. FIG. 4 is a sequence flow diagram showing the process of collecting received input voltage measurement data of an interference wave on an uplink line. As shown in FIG. 4, in step S9a, the radio device 14 of the monitoring control station 10 outputs the reception electric field level of the received signal (hereinafter referred to as "interference wave electric field data of the uplink line") to the uplink radio line analysis device 41a via the RX level terminal of the radio device 14 during a period when the observing station 20 is not outputting test radio waves (in one example, after acquiring information on the desired wave). In step S10a, the first control unit 44a of the upstream radio line analysis device 41a converts the unit of the outputted upstream line interference wave electric field data from "V" to "dBμV". After acquiring the interference wave electric field data information, the first control unit 44a of the upstream radio line analysis device 41a determines a representative value among the multiple data of the interference wave electric field data information (hereinafter referred to as the "representative value of the interference wave electric field data information").

[0039] In step S11a, the first control unit 44a of the upstream radio line analysis device 41a inquires of the basic control unit 15 as to whether or not the latest information (such as water level and rainfall) has been obtained from the observation device 21 through regular telemeter observation. In step S12a, the basic control unit 15 outputs information in which missing measurement information has been added to a representative value of the interference wave electric field data information to the uplink wireless line analysis device 41a. Then, in step S13a, the first control unit 44a of the upstream wireless line analysis device 41a stores (preserves) the representative value, date, station number, desired wave / interference wave, and missing information of the interference wave electric field data information in the collected data memory unit 451a of the first memory unit 45a. By performing the above-mentioned steps S9a to S13a, the upstream radio line analysis device 41a can obtain information (interference wave electric field data) regarding interference waves in the downstream line.

[0040] Then, in step S14a, a signal-to-noise ratio (S / N ratio) is calculated based on the desired wave electric field data and the interference wave electric field data. In one example, the S / N ratio is calculated by subtracting a representative value of the interference wave electric field data acquired at approximately the same time from a representative value of the desired wave electric field data. Next, in step S15a, the upstream wireless line analysis device 41a (first control unit 44a) judges the state of the wireless line based on the calculated S / N ratio and the allowable range stored in the first storage unit 45a. More specifically, the condition comparison and determination unit 56c judges whether the S / N ratio is within the allowable range, and judges that the state of the wireless line is good if the S / N ratio is within the allowable range, and judges that the state of the wireless line is poor if the S / N ratio is not within the allowable range.

[0041] Furthermore, in step S16a, the upstream wireless line analysis device 41a (first control unit 44a) can determine whether or not the number of times the state of the wireless line is determined to be poor exceeds the failure occurrence frequency threshold. If the number of times the state is determined to be poor exceeds the failure occurrence frequency threshold, the first control unit 44a of the upstream wireless line analysis device 41a can output an alarm command to the basic control unit 15 of the monitoring control device 11. This can notify the user via the display unit 16 (see FIG. 1) that an abnormality has occurred in the wireless line.

[0042] Then, in step S17a, the upstream radio line analyzer 41a can display on the display unit 52 the S / N ratio for each time period, the allowable range, the defect occurrence frequency threshold, and the like. Furthermore, in step S18a, after executing step S15a, the upstream wireless line analysis device 41a outputs a print command from the print control unit 48 to the printing unit 51, and the S / N ratio for each time period, the tolerance range, the defect occurrence frequency threshold, etc. can be printed by the printing unit 51. In the wireless communication system 1, the collection of data on the uplink, the determination of the state of the wireless line, and the notification to the user are controlled according to the above procedure.

[0043] Here, the first storage unit 45a will be described with reference to FIG. FIG. 5 is a diagram showing an example of the electric field data stored (accumulated) in the first storage unit 45a. As shown in Figure 5, the first memory unit 45a stores electric field data, which are representative values ​​of desired wave electric field data information and representative values ​​of interference wave electric field data information, in the order of date and time, station, missing signal status, interference wave / desired wave, and electric field data. Here, in the "Station" column, when the "Station" is "Observation 1" or "Observation 2", the observation data obtained by the wireless line analysis operation of the downlink, which will be described later, is recorded. The received data from the wireless line test is recorded as "Monitoring".

[0044] Furthermore, the missing information in the "Missing Status" column may mean that one or more pieces of information to be obtained from multiple child stations have not been obtained, or may mean that all of the information to be obtained from multiple child stations has not been obtained, and can be changed as appropriate depending on the situation and purpose.

[0045] <Downlink radio analysis operation> Next, a procedure for collecting data on the downlink will be described, taking as an example a case where the monitored device is the observation device 21. FIG. 6 is a sequence flow diagram showing the process of collecting electric field data of a desired wave in a downlink. In FIG. 6, in step S1b, the upstream radio line analyzer 41a (first control unit 44a) outputs an S / N measurement command to the basic control unit 15 of the monitor and control device 11 at any timing that does not interfere with the telemeter operation.

[0046] Then, in step S2b, the basic control unit 15 of the monitor and control device 11 transmits an S / N measurement command from the radio device 14 to the radio device 23 of the observation device 21. By receiving this signal, the downstream radio line analysis device 41b connected to the observation device 21 recognizes the start of the test.

[0047] Then, in step S3b, the upstream radio line analyzer 41a outputs a downstream test signal transmission request signal to the basic control unit 15 of the monitor and control device 11 at an arbitrary timing. Then, in step S4b, the basic control unit 15 of the monitor and control device 11 outputs a predetermined test signal to the observation device 21. Then, in step S5b, the observation device 21 outputs the desired wave electric field data information based on the received signal to the downstream radio line analysis device 41b via the RX level terminal.

[0048] After that, in step S6b, the second control unit 44b of the downstream radio line analysis device 41b converts the unit of the acquired desired electric field data information from "V" to "dBμV". Next, in step S7b, the second control unit 44b of the downstream radio line analysis device 41b executes step S7b and then determines a representative value of the multiple data of the desired wave electric field data information (hereinafter referred to as the "representative value of the desired wave electric field data information"). Then, the second control unit 44b of the downstream radio line analysis device 41b associates information such as date, area code, desired wave / interference wave, etc. with the desired wave electric field data information and stores (preserves) it in the second storage unit 45b. Note that the above-mentioned desired wave electric field data information is composed of multiple data, more specifically, multiple voltage values.

[0049] Then, in step S8b, the second control unit 44b of the downlink radio line analysis device 41b transmits a representative value of the desired wave electric field data information (including information such as date, station code, desired wave / interference wave, etc.) to the radio device 14 of the monitoring control device 11 via the radio device 23 of the observation device 21. Then, when the wireless device 14 receives the representative value of the desired wave electric field data information, the basic control unit 15 adds missing measurement information of the latest telemeter regular time observation to the representative value of the desired wave electric field data information. Then, in step S9b, the basic control unit 15 outputs the representative value and missing information of the desired wave electric field data information to the upstream wireless line analysis device 41a. The first control unit 44a of the upstream wireless line analysis device 41a acquires the representative value of the desired wave electric field data, the date, the area code, the desired wave / interference wave, and the missing information.

[0050] After that, in step S10b, the first control unit 44a of the upstream radio line analysis device 41a stores (preserves) the above-mentioned pieces of information in the first storage unit 45a. By performing the above-mentioned steps S1b to S10b, the upstream radio line analysis device 41a can obtain information (desired wave electric field data) related to the desired wave in the downstream line.

[0051] The procedure for acquiring information about interference waves will be described below with reference to FIG. FIG. 7 is a sequence flow diagram showing the process of collecting electric field data of interference waves in the downlink. As shown in FIG. 7, in step S11b, the observation device 21 outputs the received electric field level (hereinafter referred to as "downlink interference wave electric field data") based on the signal received by the radio device 23 during the period when the monitoring and control device 11 is not outputting a line test signal (in one example, after acquiring information on the desired wave) to the downlink radio line analysis device 41b via the RX level terminal. After that, in step S12b, the second control unit 44b of the downstream radio line analysis device 41b converts the unit of the obtained disturbance wave electric field data information from "V" to "dBμV".

[0052] Then, in step S13b, the second control unit 44b of the downstream radio line analysis device 41b determines a representative value of the multiple data of the interference wave field data information (hereinafter referred to as "representative value of interference wave field data information").Then, the second control unit 44b of the downstream radio line analysis device 41b associates the interference wave field data information with information such as date, station number, desired wave / interference wave, and stores (preserves) it in the second storage unit 45b. Then, in step S14b, the second control unit 44b of the wireless line analysis device 41b transmits a representative value of the interference wave electric field data information (including information such as date, station code, desired wave / interference wave, etc.) to the wireless device 14 of the monitoring control device 11 via the wireless device 23 of the observation device 21.

[0053] Then, in step S15b, when the wireless device 14 receives the representative value of the interference field data information, the basic control unit 15 adds missing information of the latest telemeter regular time observation to the representative value of the interference field data information. Then, the basic control unit 15 outputs the representative value of the interference field data information and the missing information to the uplink wireless line analysis device 41a. In step S16b, when the first control unit 44a of the upstream wireless line analysis device 41a acquires the representative value, date, station code, desired wave / interference wave, and missing information of the interference wave electric field data information, the first control unit 44a of the upstream wireless line analysis device 41a stores (saves) the above-mentioned multiple pieces of information in the first memory unit 45a.

[0054] By the above-mentioned steps S11b to S16b, the upstream radio line analysis device 41a can obtain information (interference wave field data) on the interference wave in the downlink. In the downlink, desired wave field data, which is information on the desired wave, and interference wave field data, which is information on the interference wave, are obtained. After that, in step S17b, the upstream radio line analysis device 41a (first control unit 44a) calculates the S / N ratio based on the desired wave field data and the interference wave field data. The subsequent processing is the same as that in the uplink. For example, in FIG. 3 and FIG. 4, the uplink wireless line analysis device 41a (first control unit 44a) can execute steps S15a to S18a.

[0055] Here, the second storage units 45b and 45c will be described with reference to FIG. FIG. 8 is a diagram showing an example of data stored (accumulated) in the second storage units 45b and 45c. As shown in Fig. 8, the second storage units 45b and 45c store desired wave electric field data information and interference wave electric field data information, which are composed of a plurality of electric field data. In one example, the desired wave electric field data information is a desired wave, and the interference wave electric field data information is an interference wave. In the example shown in Fig. 8, the electric field data information is written in the rightmost column, and related information is written side by side (in the row direction).

[0056] Next, the parameter / condition setting unit 46 will be described. FIG. 9 is a diagram showing an example of items set in the parameter / condition setting section 46. As shown in FIG. 9, the parameter / condition setting unit 46 can set various parameters and conditions required for data collection, which are listed in the "setting items." For example, the parameter / condition setting unit 46 can set the observation time and acquisition frequency for acquiring signals by the wireless devices 14, 23, and 33. In one example, the observation time is set to 5000 [ms] and the acquisition frequency is set to 10 [ms]. In this case, the wireless devices 14, 23, and 33 will acquire 500 pieces of data in one observation.

[0057] Also, in the example shown in Fig. 9, the output process is set to "average". This corresponds to a method of determining a representative value in uplink desired wave electric field data information, uplink interference wave electric field data information, downlink desired wave electric field data information, and downlink interference wave electric field data information, which include multiple data, and in the example shown in Fig. 9, it is set to set the average value of multiple (500) data as the representative value. Note that the output process is not limited to "average" and can be set to "median" which sets the median as the representative value, "maximum" which sets the maximum value as the representative value, etc.

[0058] The parameter and condition setting unit 46 can be set to convert the unit of the uplink desired wave electric field data information, the uplink disturbance wave electric field data information, the downlink desired wave electric field data information, and the downlink disturbance wave electric field data information from "V" to "dBμV." More specifically, when the unit of the data acquired at the RX level terminal is "V," the wireless line analysis device 41 (control unit 44) can convert the unit of the acquired data to "dBμV." The parameter / condition setting unit 46 can determine the terminal numbers of the terminals through which data is input and output.

[0059] Next, the setting screen for setting parameters and conditions will be described with reference to FIG. FIG. 10 is a diagram showing an example of a setting screen displayed on the display unit 52. As shown in FIG. 10, the allowable range (upper limit of the receiving electric field and lower limit of the receiving electric field) and the failure occurrence frequency threshold are set to arbitrary values ​​via a display unit 52 connected to the upstream radio line analysis device 41a and an operation unit (not shown) for operating the display unit 52. The unit of the failure occurrence frequency threshold can be set to "times / day", "times / week", "times / month", or "times / year".

[0060] Next, the display (printing) of the calculation results of the collected data and the determination results of the wireless line state will be described with reference to FIGS. FIG. 11 is a diagram showing an example of a menu display screen displayed on the display unit 52. As shown in FIG. 11, the wireless line analysis device 41a can output (display) a menu screen on the display unit 52 from which three items can be selected: "S / N trend," "Number of failures," and "Frequency of missing data." By operating the buttons on the display unit 52, information according to the selected item can be displayed.

[0061] First, the screen that is displayed when "S / N Trend" is selected will be described. FIG. 12 is a diagram showing the display screen of "S / N trend." As shown in Fig. 12, the change in the S / N ratio over time is displayed on the display unit 52. By operating the buttons, the target station, cycle (1 day / 1 week / 1 month / 3 months), unit (day / month / year), and period (year / month / day) can be selected, and the trend of the S / N ratio for the specified content is displayed. The displayed content can be printed by the printing unit 51 by operating the buttons to select "Print" on the screen.

[0062] Next, a screen that is displayed when "Number of Defects" is selected will be described. FIG. 13 is a diagram showing the display screen for "Number of Defects Occurred." As shown in Fig. 13, the display unit 52 displays the change over time in the number of failure occurrences. The number of failure occurrences is the number of times the S / N ratio is not within the set allowable range (the wireless line condition is determined to be poor). For example, in the 1:00 hour hour of Fig. 13, the number of times the S / N ratio is not within the allowable range is one. In other words, the number of failure occurrences in the 1:00 hour hour is one. The display screen for "Number of Failure Occurrences" can be printed by selecting "Print" in the same way as the display screen for "S / N Trend".

[0063] Next, a screen that is displayed when "Missing Data Occurrence Frequency" is selected will be described. FIG. 14 is a diagram showing the display screen for "missing data occurrence frequency." As shown in Fig. 14, the display unit 52 displays the change over time in the frequency of missing data. The frequency of missing data is the number of times missing data occurs within a specified period of time. For example, in the example of Fig. 14, when the target station is observation station 20, there was one time during the 1:00 hour period when data could not be obtained by telemeter observation at fixed time. In other words, the frequency of missing data during the 1:00 hour period is one time. The display screen for "Frequency of Missing Data" can be printed by selecting "Print" in the same way as the display screen for "S / N Trend".

[0064] Next, a case where the number of occurrences of defects exceeds the defect occurrence frequency threshold will be described. FIG. 15 is a diagram showing a display screen when an alarm command is output. As described above in step S16a of FIG. 4, if the number of times that the condition of the wireless line is determined to be poor exceeds the failure occurrence frequency threshold, the wireless line analysis device 41a determines that an abnormality has occurred in the wireless line, and outputs an alarm command to the basic control unit 15 of the monitoring control device 11. As shown in Fig. 15, when an alarm command is input to the basic control unit 15, the "wireless error" on the display unit 16 changes from white to red. Note that the alarm may be displayed by repeatedly flashing white and red, or by lighting up in another color, etc. Also, an alarm sound can be emitted from the speaker of the display unit 16.

[0065] The effects of this embodiment will be described below. According to the wireless communication system 1 of this embodiment, the upstream wireless line analysis device 41a stores, in the first storage unit 45a, desired wave electric field data information based on the line test signal received by the monitoring control device 11 (wireless device 14) and interference wave electric field data information based on the signal received by the monitoring control device 11 (wireless device 14) during a period different from the reception period of the line test signal. This makes it possible to store data required for grasping the state of the upstream line and identifying the cause of the failure, thereby making it possible to obtain a wireless communication system, a wireless line analysis device, and a wireless line analysis method for a wireless communication system that can shorten the period during which a system failure related to the wireless line occurs and improve reliability. The upstream wireless line analyzer 41a calculates the signal-to-noise ratio based on the desired wave electric field data information and the interference wave electric field data information, and judges the state of the wireless line based on the allowable range and the signal-to-noise ratio stored in the first storage unit 45a. This makes it possible to judge whether the state of the upstream line is good or bad, and to discover system failures related to the wireless line at an early stage.

[0066] Downstream wireless line analyzers 41b, 41c are connected to the monitored device (observation device 21 or discharge alarm device 31), and the downstream wireless line analyzers 41b, 41c store in the second storage units 45b, 45c the desired wave electric field data based on the line test signal received by the monitored device (wireless device 23, 33) and the interference wave electric field data information based on the signal received by the monitored device (wireless device 23, 33) during a period different from the reception period of the line test signal. The desired wave electric field data and the interference wave electric field data are sent to the monitoring control device 11 via the wireless line and stored in the first storage unit 45a of the upstream wireless line analyzer 41a. This makes it possible to store data necessary for grasping the state of the downstream line and identifying the cause of the failure. The upstream wireless line analysis device 41a calculates the signal-to-noise ratio based on the desired wave electric field data information and the interference wave electric field data information, and can judge the state of the wireless line based on the allowable range and the signal-to-noise ratio stored in the first memory unit 45a.

[0067] The monitoring control device 11 is equipped with a display unit 16 that displays the operating status of the monitoring control device 11 and the monitored devices (the observation device 21 and the discharge warning device 31). A failure occurrence frequency threshold is stored in the first storage unit 45a. When the number of times that the wireless line is judged to be defective exceeds the failure occurrence frequency threshold, the upstream wireless line analysis device 41a notifies the user via the display unit 16 that an abnormality has occurred in the wireless line. This allows early detection of communication system failures in the wireless lines.

[0068] The upstream radio line analysis device 41a is connected to a display unit 52 and a printer unit 51. The upstream radio line analysis device 41a can display the time change of the signal-to-noise ratio on the display unit 52. Furthermore, the upstream radio line analysis device 41a can print the screen displayed on the display unit 52 by the printer unit 51. The display unit 52 can also display the time change of the number of times it was judged to be defective or the number of times missing data occurred. This makes it easier to investigate the cause of a system failure.

[0069] Although several embodiments of the present invention have been described, the above embodiments are presented as examples and are not intended to limit the scope of the invention. The novel embodiments described above can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The above embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0070] 1...wireless communication system, 10...monitoring and control station, 11...monitoring and control device, 12...antenna, 14...wireless device, 15...basic control unit, 16...display unit, 20...observation station, 21...observation device, 22...antenna, 23...wireless device, 24...water level gauge, 25...rain gauge, 30...discharge warning station, 31...discharge warning device, 32...antenna, 33...wireless device, 41a, 41b, 41c...wireless line analysis device, 43a, 43b, 43c...IF unit, 44a, 44b, 44c...control unit, 45a, 45b, 45c...memory unit, 46a, 46b, 46c...parameter / condition setting unit, 47a, 47b, 47c...display control unit, 48a, 48b, 48c...printing control unit, 51...printing unit, 52...display unit.

Claims

1. A wireless communication system in which a monitoring control device and a monitored device are connected via a wireless line, an upstream radio line analyzer connected to the monitoring and control device; The upstream radio line analysis device includes: A first storage unit that stores electric field information based on a signal received by the monitoring control device, and a first control unit that can output a signal to the monitoring control device, The first control unit of the upstream radio line analysis device causing the monitoring and control device to transmit, to the monitored device, a test signal transmission request signal which causes the monitored device to output a line test signal; The first storage unit stores uplink desired wave electric field data information, which is electric field data based on the line test signal received by the monitoring and control device, and uplink interference wave electric field data information based on a signal received by the monitoring and control device during a period different from a reception period of the line test signal, determining a state of an uplink wireless line based on the desired wave electric field data information of the uplink and the interference wave electric field data information of the uplink; Wireless communication system.

2. the wireless communication system is a telemetry system, The monitored device is an observation device monitored by the monitoring control device.

2. The wireless communication system according to claim 1.

3. The wireless communication system is a discharge alarm system, The monitored device is a discharge alarm device monitored by the monitoring control device.

2. The wireless communication system according to claim 1.

4. The first storage unit stores a tolerance range, The first control unit calculates a signal-to-noise ratio based on the desired wave field data information of the uplink and the interference wave field information of the uplink, and judges the state of the uplink wireless line based on the allowable range and the signal-to-noise ratio.

2. The wireless communication system according to claim 1.

5. a downstream wireless line analyzer that can be connected to the monitored device; The downstream radio line analysis device comprises: a second storage unit that stores electric field information based on a wireless signal received by the monitored device, and a second control unit that is capable of outputting a signal to the monitored device; The first control unit of the downlink radio channel analysis device a test signal transmission request signal for causing the monitoring and control device to output a line test signal is output to the monitoring and control device, thereby causing the monitoring and control device to output a signal; The second control unit of the upstream radio line analysis device storing, in the second storage unit, downlink desired wave electric field data information, which is electric field data based on the line test signal received by the monitored device, and downlink interference wave electric field data information, which is based on a signal received by the monitored device during a period different from a reception period of the line test signal; transmitting desired wave field data information of the downlink and interference wave field data information of the downlink from the monitored device to the monitoring and control device; The first control unit of the upstream radio line analysis device The monitoring and control device stores the downlink desired wave field data information and the downlink interference wave field data information received by the monitoring and control device in the first storage unit, determining a state of a downlink wireless line based on the downlink desired wave electric field data information and the downlink interference wave electric field data information; 2. The wireless communication system according to claim 1.

6. The first storage unit stores a tolerance range, The first control unit calculates a signal-to-noise ratio based on the desired wave field data information of the downlink and the interference wave field data information of the downlink, and judges the state of the downlink wireless line based on the allowable range and the signal-to-noise ratio.

6. The wireless communication system according to claim 5.

7. The monitoring control device includes a display unit that displays the operating states of the monitoring control device and the monitored device, The first storage unit stores a defect occurrence frequency threshold value, The first control unit is If the signal-to-noise ratio is within the allowable range, it is determined that the condition of the wireless line is good, and if the signal-to-noise ratio is not within the allowable range, it is determined that the condition of the wireless line is poor; when the number of times that the state of the wireless line is judged to be poor exceeds the failure occurrence frequency threshold, notifying the user on the display unit that the number of times that the state of the wireless line is judged to be poor has exceeded the failure occurrence frequency threshold; 5. The wireless communication system according to claim 4.

8. a display unit connected to the upstream radio line analysis device, The first control unit stores the signal-to-noise ratio in the first storage unit in association with time, and displays a time change of the signal-to-noise ratio on the display unit.

5. The wireless communication system according to claim 4.

9. a printing unit connected to the upstream radio line analysis device, The first control unit can store the signal-to-noise ratio in the first storage unit in association with time, and can print the change in the signal-to-noise ratio over time with the printing unit.

5. The wireless communication system according to claim 4.

10. In a wireless communication system in which a monitoring control device and a monitored device are connected via a wireless line, a wireless line analysis device is connected to the monitoring control device or the monitored device and analyzes a state of the wireless line, a storage unit that stores electric field information based on signals received by a connected device among the monitoring control device and the monitored device; A control unit capable of outputting a signal to the connected device. The storage unit stores desired wave electric field data information of the line, which is electric field data based on the line test signal received by the monitoring and control device, and interference wave electric field data information of the line, which is based on a signal received by the monitoring and control device during a period different from the reception period of the line test signal, determining the state of the wireless line based on the desired wave electric field data information of the line and the interference wave electric field data information of the line; Radio line analysis equipment.

11. The storage unit stores a tolerance range, the control unit calculates a signal-to-noise ratio based on the electric field information, and determines a state of the wireless line based on the allowable range and the signal-to-noise ratio. The radio line analysis device according to claim 10.

12. A monitor and control device is connected to the monitor and control device. The control unit is causing the monitoring and control device to transmit, to the monitored device, a test signal request signal that causes the monitored device to output a line test signal; The storage unit stores uplink desired wave electric field data information, which is electric field data based on the line test signal received by the monitoring and control device, and uplink interference wave electric field data information based on a signal received by the monitoring and control device during a period different from the reception period of the line test signal, determining a state of an uplink wireless line based on the desired wave electric field data information of the uplink and the interference wave electric field data information of the uplink; The radio line analysis device according to claim 10.

13. connected to the monitored device; The control unit transmits to the monitoring and controlling device desired wave electric field data information of the downlink based on the line test signal received by the monitored device, and interference wave electric field data information of the downlink based on a signal received by the monitored device during a period different from a reception period of the line test signal. The radio line analysis device according to claim 10.

14. A wireless line analysis method for a wireless communication system in which a monitoring control device and a monitored device are connected via a wireless line, comprising: causing the monitoring and control device to transmit, to the monitored device, a test signal transmission request signal which causes the monitored device to output a line test signal; storing uplink desired wave electric field data information based on the line test signal received by the monitoring and control device, and uplink interference wave electric field data information based on a signal received by the monitoring and control device during a period different from the reception period of the line test signal; determining a state of an uplink wireless line based on the desired wave electric field data information of the uplink and the interference wave electric field data information of the uplink; A method for analyzing radio links in a wireless communication system.

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