JP2009076997A - Telemeter system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To be able to change an existing telemeter system into an IP (Internet Protocol) network telemeter system inexpensively and easily, regardless of wireless one or wired one. <P>SOLUTION: In a telemeter system, one monitoring station supervises information from a plurality of observation stations, and the transmission frequency of the information between the monitoring station and the observation stations is a voice band. The monitoring station is connected to an IP network through a voice IP-enabled apparatus, and also the observation stations are connected to the IP network through a voice IP-enabled apparatus. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

In the present invention, observation data such as earthquake and storm / water damage information collected from sensors, measuring instruments, etc. at an observation station installed in a remote place is used as IP (Internet Protocol).
The present invention relates to a telemeter system configured to transmit / receive to / from a monitoring station via a wireless or wired communication line by a network.

In this type of telemeter system, especially when handling observation data of disaster information, it is required to transmit observation data quickly and accurately. In addition, in order to predict and prevent secondary disasters, or to quickly formulate recovery work plans, etc., the damage status or disaster information can be obtained from the national or local governments such as the police, fire department, meteorological agency, railways, buses, etc. It is necessary to quickly and accurately communicate detailed information to a plurality of responsible departments and persons in charge who need disaster information at an early stage, such as a transport company in Japan.

A conventional telemeter system includes a monitoring station and a plurality of observation stations. An IP (Internet Protocol) address is allocated to each of the monitoring station and each observation station to construct an IP network with each other, and each observation station is connected to the network. An IP address is allocated to each of the various sensors, and an IP network is constructed, and the observation request from the monitoring station to the sensor of the observation station and the observation data obtained by the sensor are transmitted by IP packets, respectively. (See Patent Document 1).

In addition, as a conventional alarm communication system, the alarm trigger reference value is set for any of the telemeter water level, telemeter hourly rainfall, telemeter cumulative rainfall, or radar rain (time / accumulation / rain movement), and the alarm trigger is activated. In some cases, alarm information such as e-mails and alarm signals is automatically notified to users of mobile phones and mobile terminals to notify the danger of flooding (see Patent Document 2).

Furthermore, as a mail communication system using a conventional mobile phone, a sender creates a mail communication including attachment files via the Internet between mobile phones of different standards or between a mobile phone and a normal computer. There is a system that faithfully transmits the content to the receiver (see Patent Document 3).

Therefore, according to the prior art, a telemeter system that transmits observation data of a remote place via the Internet is well known. It is also well known that mail communication including an attached file is performed via the Internet between mobile phones or between a mobile phone and a normal computer.

JP 2002-305776 A JP 2002-350559 A JP 2002-319976 A

However, the actual equipment installation status in the telemeter system is not yet networked, and there are many cases in which the monitoring station and the observation station are connected wirelessly and data is transmitted and received by a wireless transceiver. When replacing it, the increase in the cost is a problem.

In addition, even if the telemeter system is already networked, a large number of special observation stations and monitoring stations corresponding to the network are installed, so that the bandwidth consumed by the telemeter system is limited in the bandwidth resources of the finite IP network. The problem is that it grows.

Therefore, the present invention uses an existing network-incompatible observation station as it is, makes it possible to cope with an IP network by adding an inexpensive device, and drastically reduces the consumption of bandwidth resources than before. To make it the center of the problem.

In order to solve the above problems, the present invention provides a telemeter system in which one monitoring station monitors information of a plurality of observation stations, and a transmission frequency of information between the monitoring station and the observation station is a voice band. The monitoring station is connected to an IP network via a voice IP device, and the observation station is also connected to the IP network via a voice IP device.

Further, the individual call signal from the monitoring station to the observation station is multicast distribution, and one monitoring station transmits signals to a plurality of observation stations all at once, and information distribution from the observation station to the monitoring station is The telemeter system is characterized by unicast distribution from the observation station called by the individual call signal to the monitoring station.

According to the present invention, by using a voice IP device, it is possible to easily realize an existing telemeter system that is not IP-enabled, and to greatly reduce the cost burden. In addition, since the information distribution from the monitoring station to the observation station is one-to-many multicast communication, the bandwidth consumption of the network can be greatly reduced.

A preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 relates to a conventional system, and is a diagram of a telemeter system using a radio. According to the figure, one monitoring station 101 and a plurality of observation stations 107 are connected by communication means via wireless devices 103 and 105.

Each observation station 107 observes the water level of the dam, and when the monitoring station 101 wants information on, for example, the C station, the wireless communication station 103 transmits each wireless signal so that the C station transmits information to the monitoring station. Communication is made to the machine 105. Each of the radio stations A to C receives this, but only the corresponding C station issues the observed information to the radio 103 of the monitoring station.

Similarly, FIG. 2 relates to a conventional system, and is a diagram of a telemeter system using a telephone line. According to the figure, one monitoring station 201 and a plurality of observation stations 207 are connected by communication means via multiplexing devices 203 and 205 corresponding to the number of observation stations.

Each observation station 207 observes the water level of a dam, and when the monitoring station 201 wants information on, for example, the C station, the multiplexing device 203c transmits another information to the monitoring station so that the C station transmits information to the other monitoring station. The information for the stations C and B is multiplexed and then transmitted to the multiplexer 205c through the telephone line, the information for the station C is extracted, and the observation information of the station C is similarly transferred from 205c to 203c in response to this. To communicate.

Similarly, FIG. 3 also relates to a conventional system, and is a diagram of a telemeter system using an IP network. According to the figure, one monitoring station 301 and a plurality of observation stations 311 are connected by IP communication via multiplexing apparatuses 303 and 309 corresponding to the number of observation stations and voice IP conversion apparatuses 305 and 307 using VoIP technology. Has been.

Each observation station 311 observes the water level of the dam, and when the monitoring station 301 wants information on the C station, for example, the multiplexing device 303c is used for the A station so that the C station transmits information to the monitoring station. And the information for station B are multiplexed, converted to IP by voice IP unit 305c, decoded by voice IP unit 307c through the IP network, and information for station C is multiplexed by multiplexer 309c. In the same manner, the observation information of station C is transmitted from 309c to 303c in response to this.

FIG. 4 relates to the system of the present invention and is a diagram of a telemeter system using an IP network. The first feature of the present invention is that the monitoring station and the observation station perform encoding and decoding only by the voice IP device without passing through the multiplexer when transmitting and receiving information. The second feature is that the communication from the monitoring station to the observation station is a one-to-many multicast communication, while the communication from the observation station to the monitoring station is a one-to-one unicast communication.

According to the first feature of the present invention, digital communication using only a voice IP apparatus without using a multiplexing apparatus is effective for any conventional example shown in FIGS. For example, even in a telemeter system using radio as shown in FIG. 1, it is possible to connect to an IP network by using a voice IP device instead of the radios 103 and 105.

Moreover, the reason why the information of the monitoring station and the observation station can be directly input to the voice IP device is that the information transmission frequency of the existing telemeter system is within the range of the voice band. There is no waking.

The press / squelch contact signal included in FIGS. 1 to 4 controls signal transmission on / off, and is transmitted from the monitoring station to the observation station in the press state.

A multicast call and a unicast response according to the second feature of the present invention will be described with reference to FIG.

For example, when the monitoring station 401 wants observation information that the station C is measuring, the press / squelch contact signal is put into a pressed state, and a signal that the station C requests to respond is encoded into an IP signal by the voice IP unit 403. The data is transmitted from the voice IP conversion devices 405a to 405c of all the observation stations via the IP network, and each observation station performs decoding processing by the voice IP conversion device.

When the station C recognizes that the own station has been called, the information held by the observation station of the station C is encoded by the voice IP device 405c and transmitted to the voice IP device 403 of the monitoring station via the IP network. 403, the decoding process is performed, and information on the C station is provided to the monitoring station. As described above, when the monitoring station performs multicast transmission, the monitoring station only needs to have one IP unit, which is highly effective in terms of installation area and cost.

The effect by the 1st characteristic of this invention is that it becomes possible to implement | achieve IP-ization of the existing telemeter system irrespective of a wireless cable. In addition, the effect of the second feature of the present invention is that only one system of voice IP conversion means on the monitoring station side is required, so that the installation area and installation cost can be reduced, and the occupied bandwidth in the IP network can be reduced. It is possible.

In the present embodiment, the case where there are three observation stations is shown, but there is no limitation due to the number of observation stations. Further, although the press / squelch contact signal is used for signal transmission control from the observation station to the monitoring station, other control means may be used as long as it performs a switching operation.

Conventional telemeter system with wireless link Conventional telemeter system by wired line Conventional telemeter system by IP network Telemeter system according to the present invention

Explanation of symbols

101: Monitoring station 103: Monitoring station side radio
105: Observation station side radio, 107 ... Observation station,
201 ... monitoring station, 203a, 203b, 203c ... monitoring station side multiplexer,
205a, 205b, 205c ... observation station side multiplexer, 207 ... observation station,
301: Monitoring station, 303a, 303b, 303c ... Monitoring station side multiplexer,
305a, 305b, 305c ... monitoring station side voice IP conversion device,
307a, 307b, 307c ... Observation station side voice IP device,
309a, 309b, 309c ... observation station side multiplexing device, 311 ... observation station,
401 ... monitoring station, 403 ... monitoring station side voice IP device,
405a, 405b, 405c ... Observation station side voice IP conversion device,
407: Observation station.

Claims (2)

In a telemeter system in which one monitoring station monitors information of a plurality of observation stations, and the transmission frequency of information between the monitoring station and the observation station is a voice band, the monitoring station transmits an IP through a voice IP device. A telemeter system, wherein the telemetry system is connected to a network, and the observation station is also connected to an IP network via a voice IP device.
The individual call signal from the monitoring station to the observation station is multicast distribution, and one monitoring station transmits signals to a plurality of observation stations all at once, and the information distribution from the observation station to the monitoring station is the individual distribution signal. The telemeter system according to claim 1, wherein the telemetry system is unicast delivery from the observation station called by the call signal to the monitoring station.