JP2003087177A - Induction radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system using induction radio capable of performing stable communication by suppressing influence of indirectly coupled components while suppressing increase in cost. SOLUTION: In this present prevention, a dividing means 23 divides an induction line 7b between line couplers into a plurality of receiving sections with respect to a base station voice communication reception wave S2R. Since each receiving section has its length shortened, the components to be subjected to inductive coupling can be reduced. The base station voice communication reception wave S2R from each receiving section is received by a base station device 2b and at least N-1 receivers 3b to be demodulated into a sound signal, and an extracting means 30A extracts a demodulated sound signal with a high signal to noise ratio (S/N) of the base station voice communication reception wave S2R among demodulated sound signals as a sound signal to be transmitted to an operation instruction center 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system using guided radio in railways and the like.

[0002]

2. Description of the Related Art Inductive radio communication is a communication means utilizing an electromagnetic induction magnetic field between an induction wire of a ground facility and an antenna of a mobile station on-board device, and is widely used for ground railways and subway lines.
Inductive wireless communication methods are roughly divided into a direct coupling method in which the mobile station onboard antenna and the induction wire are directly electromagnetically coupled (inductive coupling), and another electric wire is provided between the mobile station onboard antenna and the induction wire.
There is an indirect coupling method in which communication is performed by secondary coupling of high-frequency current with an intervening electric line (trolley line) for supplying electric power for driving a train, for example.

FIG. 5 is a schematic configuration diagram of a guided radio communication system according to the prior art, and shows a communication system of an indirect coupling system with an electric train line (trolley line) 15 interposed. As shown in FIG. 5, the communication system includes, for example, a driving command station 1, a base station device (fixed station (device)) 2 connected to the driving command station 1 via a communication line 8, and a train line 15. A guide line 7 laid along the line, and a mobile station onboard device 12 mounted on a railcar (train) 13 traveling on the railroad track, a mobile station onboard antenna including a receiving antenna 10 and a transmitting antenna 11. To be done.

The guide line 7 is divided into a plurality of sections, and each section is connected between two line couplers (line coupler (starting end coupler)).
4 or between the line coupler (starting coupler) 4 and the line coupler (terminating coupler) 5). The base station device 2 is provided for each section and has a line coupler 4
Is connected to the guide wire 7A via. In addition, the base station device 2
The two are connected via a communication line 8. Further, a satellite receiving station 3 is connected to the line coupler 4 or the terminal coupler 5 on the opposite side of the line coupler 4 to which the base station device 2 is connected, if necessary. When the satellite receiving station 3 is provided, the satellite receiving station 3 is connected to the base station device 2 in the same section via the communication line 9.

When the voice is transmitted from the driving command station 1 to the railway vehicle 13, the voice emitted from the driving command station 1 is transmitted to the base station device 2 as a voice signal, and the base station device 2 guides the guided radio frequency f1. High frequency current (eg 130 kHz)
(Base station call transmission wave: hereinafter referred to as "signal S1"), and then transmitted to the guide line 7 through the line coupler 4. The signal S1 sent to the guide line 7 is temporarily
5 is electromagnetically induced (inductively coupled) (primary coupling). Train line 15
The signal S1 guided to (1) is further inductively coupled to the receiving antenna 10 (secondary coupling). Then, the signal S1 received by the receiving antenna 10 is input to the mobile station on-board device 12 and demodulated into a voice signal, and a voice corresponding to the voice signal is output by the rail vehicle 13.

On the other hand, when the voice is transmitted from the railway vehicle 13 to the driving command station 1, the voice emitted by the railway vehicle 13 is guided by the mobile station on-board device 12 from the voice signal to the guided radio frequency f2 (for example, 180 kHz). ) High-frequency current (mobile station call transmission wave: hereinafter referred to as "signal S2"),
Electromagnetic radiation is emitted from the transmitting antenna 11. by this,
The signal S2 is inductively coupled to the train line 15 (primary coupling) and then to the inductive line 7 (secondary coupling).
When the signal S2 is inductively coupled to the guide line 7, it is referred to as a “base station call reception wave” in the sense of a guide radio wave received at the base station side (hereinafter, the signal of the base station call reception wave is referred to as “signal S2R”). "). The frequency of the signal S2R is the signal S
It is the same as 2 (for example, 180 kHz). After that, the signal S2R is input to the base station device 2 through the line coupler 4.
(Received) and converted (demodulated) into an audio signal. On the other hand, the signal S
The 2R is also received by the satellite receiving station 3 and demodulated into an audio signal. The voice signal demodulated by the satellite receiving station 3 is transmitted to the base station apparatus 2 through the communication line 9 and compared with the voice signal demodulated by the base station apparatus 2 to determine the signal-to-noise ratio (S / N) of the signal S2R. The better one is picked up (extracted), and only the extracted voice signal is transmitted to the operation command station 1 through the communication line 8. Alternatively, the voice signal picked up by the base station device 2 is compared with the voice signal demodulated by the adjacent base station device 2, and only the one having a better signal-to-noise ratio (S / N) is transmitted to the operation command station 1. To be done. In this way, the voice signal obtained by demodulating the signal S2R having the best signal-to-noise ratio (S / N) is transmitted to the operation command station 1. And
A voice corresponding to the voice signal is output from the driving command center 1.
With the above configuration, voices can be mutually (bidirectionally) transmitted and received between the operation command center 1 and the railway vehicle 13.
Such an indirect coupling method has an advantage that the laying of the guide line 7 is easier and more economical than the direct coupling method.

[0007]

However, the indirect coupling method has the following problems. That is, other train lines (for example, train lines in the opposite lane), feeder lines, communication lines, signal lines, etc. (referred to as “other conductor lines”) are generally installed near the guide line 7. Therefore, when the signal S2 is primarily coupled from the transmission antenna 11 to the train line 15, it may be inductively coupled to other conductors. In this case, the guide line 7 includes a signal S2R (referred to as “direct coupling component”) due to the secondary coupling (normal inductive coupling) from the train line 15 and a signal S2R (referred to as a “direct coupling component”) from another conductor. (Referred to as an "indirect coupling component") is received at the same time. The indirect coupling component is different in phase and signal level from the direct coupling component, but has the same frequency.
For this reason, the indirect coupling component interferes with the direct coupling component, such as canceling out the direct coupling component due to the phase difference (level drop due to the phase difference), so that the reception level of the signal S2R by the base station device 2 becomes unstable. Has become. If the reception level is unstable, sometimes a sufficient signal S2R cannot be obtained, and a voice interruption may occur in the communication from the railway vehicle 13 to the operation command center 1. Therefore, by providing the satellite receiving station 3 to compare voice signals or to compare voice signals between adjacent base stations,
An audio signal obtained by demodulating the signal S2R having a good reception state is transmitted to the operation command station 1.

At present, the guide line 7 is divided into 14 units of substations, 17 units of stations, or units of several km to several tens of km, and in particular, from the viewpoint of measures against overreach interference of guided radio waves, 14 units of substations. Often divided into sections.
In this case, the length of one section of the guide line 7 is several kilometers or more.
It will be several tens of kilometers.

The above indirect coupling component has a length of one section.
The longer the (guide wire 7A), the more it tends to increase.
Because, the longer one section is, the more the number of other conductors that become a base for generating the indirect coupling component and the number of places where the other conductors are installed in the state where they can be inductively coupled with the train wire 15 and the guide wire 7A tend to increase. Is. Therefore, if the length of one section is shortened, the indirect coupling component can be reduced.

However, the signals S1 and S2 (signal S
The presence of the base station device 2 is essential for transmitting and receiving 2R). Therefore, if the number of sections is increased, the base station device 2 must be prepared accordingly, and the cost of the communication system increases.

The present invention has been made in view of the above circumstances, and provides a communication system using inductive radio that suppresses the influence of an indirect coupling component and enables stable communication while suppressing the cost increase. With the goal.

[0012]

The present invention adopts the following constitution in order to achieve the above-mentioned object.

That is, according to the present invention, there is provided an induction line arranged along a train line and provided between line couplers, a base station device connected to the induction line through one of the line couplers, and a train. A mobile station on-board antenna and a mobile station on-board device to be mounted, wherein the base station device modulates an audio signal from a driving command station into a base station call transmission wave having a first induction radio frequency to perform the induction. The base station call transmission wave is inductively coupled from the guide line to the train line, is inductively coupled from the train line to the mobile station on-board antenna, and is received and demodulated by the mobile station on-board device. The mobile station onboard device modulates a voice signal into a mobile station onboard call transmission wave having a second guided radio frequency and transmits the same from the mobile station onboard antenna,
A mobile station on-vehicle call transmission wave is inductively coupled to the train line and inductively coupled from the train line to the guide line as a base station call reception wave, and the base station call reception wave is received and demodulated by the base station device. In a communication system using inductive radio, N (N is a natural number of 1 or more) induction lines are connected in series to configure the induction line, and one or the other of the two induction lines connected to itself is configured. Of the base station call transmission wave to the other or one side and blocking the passage of the base station call reception wave input from one and the other of the two guide lines to convert the guide line into the base station call transmission wave. On the other hand, N-1 dividing means for dividing the base station call reception wave into N reception sections for each guiding line, and at least one base station call reception wave for demodulating into a voice signal. N-1 receiving devices and the base station device And most base station call received wave signal to noise ratio of the audio signal demodulated by the receiving apparatus (S
/ N) is extracted as a voice signal to be transmitted to the operation command center, and the base station device is connected to the line coupler connected to the base station device. Responsible for the corresponding reception section, receives a base station call reception wave from this reception section, and receives at least N-
It is characterized in that one receiving device is responsible for each of the intervals other than the interval for which the base station device is responsible, and receives the base station call reception wave from the guide line corresponding to the receiving interval for which it is responsible.

According to the communication system of the present invention, N-
Since the guide line between the line couplers is divided into N receiving sections for the base station call reception wave by one dividing means, the length of each receiving section is shortened and the line is guided from the train line. The indirect binding component to be bound can be reduced, and the interference of the indirect binding component with the direct binding component can be suppressed.
Then, the base station device and at least N-1 receiving devices provided so as to handle the base station call reception wave in each reception section receive the base station call reception wave in the corresponding reception section and demodulate into an audio signal. To do. Then, the extracting means extracts, from the demodulated voice signals, the one having the best signal-to-noise ratio (S / N) of the call reception wave of the base station as the voice signal to be transmitted to the operation command station. The level of the audio signal transmitted to the command center can be stabilized. Since such a system is not configured by shortening the length of the guide line between the line couplers, the reception section of the base station call reception wave, the number of base station devices need not be increased, and the cost can be reduced. The rise can be suppressed.

The dividing means according to the present invention comprises a frequency-passing type filter circuit for passing a base station call transmission wave from each of the two guiding lines, and a base station call receiving wave from each of the two guiding lines. And a band-stop type filter circuit for blocking

In the present invention, "between line couplers" includes "between start couplers" and "between start couplers and end couplers". It suffices that the base station call transmission wave and the mobile station on-board call transmission wave (base station call reception wave) have different guided radio frequencies. The inductive wireless communication system according to the present invention is preferably applied to the above-ground section of the railroad track, but can also be applied to the underground section. The number of receiving sections to be divided can be any number, and the number of dividing means is N-1 with respect to the planned number N of receiving sections.

In the communication system of the present invention, the base station device and at least N-1 receiving devices are arranged so that the base station call reception waves from the N divided reception sections are respectively received. It is provided so as to be in charge of the reception section. However, the present invention does not require that the number of receiving devices for one receiving section is one, and the number of receiving devices provided is greater than N−1, and the base station device and one or more receiving devices are provided. The device or two or more receiving devices may respectively receive the base station call reception waves from one reception section.

Further, according to the present invention, two receiving devices are connected to the dividing means, and the dividing means receives the base station call reception wave inputted from one of the two guiding lines of the two receiving devices. By inputting the call reception wave of the base station, which is input to one side and input from the other side, to the other of the two receiving devices, the one receiving device is a base station from a receiving section corresponding to the one guiding line. It is preferable that the other receiving device receives the call reception wave and receives the base station call reception wave from the reception section corresponding to the other guiding line.

The present invention also provides a phase adjustment for adjusting the phase of the base station call reception wave so that the base station call reception wave received by the base station device and the at least N-1 receiving devices have the same phase. It may be configured to include means. By doing this, it is possible to fine-tune the phase of the induced radio wave (high-frequency current), so that it is possible to perform stable communication by increasing or decreasing the reception level by phase inversion for the reception of the mobile station on-board communication transmission wave. it can.

Further, the present invention is a communication method using inductive radio, comprising: an inductive line arranged along a train line and provided between line couplers; and the inductive line via one of the line couplers. And a mobile station on-board antenna mounted on a train and a mobile station on-board device, the base station device having a first induction radio frequency for a voice signal from a driving command station. The base station call transmission wave is modulated and transmitted to the guide line, and the base station call transmission wave is inductively coupled from the guide line to the train line and the mobile line is inductively coupled to the mobile station onboard antenna. The mobile station onboard device receives and demodulates the voice signal, and the mobile station onboard device modulates a voice signal into a mobile station onboard call transmission wave having a second guided radio frequency and transmits it from the mobile station onboard antenna to move. Local train call transmission wave to the train line Inductively coupled from the train line to the guide line as a base station call reception wave, and the base station call reception wave is received and demodulated by the base station device and connected to itself in a communication system using inductive radio. The base station call transmission wave from one or the other of the two guiding lines is passed to the other or one side, and the base station call receiving wave input from one or the other of the two guiding lines is blocked. Thus, the guide line is divided into N (N is a natural number of 1 or more) reception sections for the base station call reception wave with one section for the base station call transmission wave. The N induction wires are connected in series to configure the induction line,
The base station device is configured to receive a reception section corresponding to a guide line directly connected to a line coupler connected to itself and receive a base station call reception wave from this reception section,
At least N-1 receiving devices are prepared, each of these receiving devices is responsible for a section other than the section for which the base station apparatus is responsible, and receives the base station call reception wave from the guide line corresponding to the receiving section that it is responsible for. The base station device and the at least N-1
Among the voice signals demodulated by the individual receiving devices, the one having the best signal-to-noise ratio (S / N) of the received wave of the base station call is extracted as a voice signal to be transmitted to the operation command station. To do.

[0021]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The configuration of the embodiment is an example, and the present invention is not limited to the configuration of the embodiment.

FIG. 1 is an overall configuration diagram showing an embodiment of a communication system according to the present invention. In FIG. 1, the same components as those of the conventional communication system are designated by the same reference numerals.

In FIG. 1, a train line (trolley line) 15 for supplying driving power to the rail vehicle 13 is provided on a track 16 on which the rail vehicle 13 travels. Railway car 13
Receives electric power from the substation 14 via a train line 15. A plurality of substations 14 are provided at predetermined intervals (several kilometers to several tens of kilometers).

The communication system using inductive radio is provided as follows. That is, the guide line 7 is installed in parallel with the power line 15 at substantially the same height. In the example shown in FIG. 1, the guide line 7 is aligned with the installation position of the substation 14.
It is divided into multiple sections (by substation). Specifically, the guide line 7 is divided into three sections (first, second, and third sections) that match the two substations 14. When the guide line 7 is divided into a plurality of sections, each section is
It has a guide line that connects between line couplers and base station equipment for each section
(Fixed station device: TR station) 2 is provided. In the example shown in FIG. 1, base station devices corresponding to the first, second and third sections, respectively.
(TR stations) 2a, 2b and 2c are prepared, and each base station device 2a, 2b and 2c includes a line coupler (starting end coupler) 4a, 4
It is connected to the guide line 7 in each section via b and 4d. Each of the base station devices 2a, 2b and 2c has a communication line 8
Is connected to the operation command station 1 through the other terminal and is also connected to another base station device in an adjacent relationship.
It is also possible to communicate with other base station devices.

On the other hand, the railway vehicle 13 has the receiving antenna 10
And a mobile station on-board antenna comprising a transmitting antenna 11,
The mobile station onboard device 12 connected to the mobile station onboard antenna is mounted.

The driving command station 1 and the mobile station on-board device 12 are
A two-way call is performed (sending and receiving voice) via the base station device, the guide line 7, the train line 15, and the mobile station onboard antenna. Therefore, the driving command station 1 transmits the audio signal to each of the base station devices 2a, 2b and 2c, and each of the base station devices 2a, 2b.
b and 2c transmit the audio signal to the first guided radio frequency f1.
Modulate to a high frequency current (signal S1) having (for example, 130 kHz). The signal S1 is transmitted to the mobile station on-board device 12 via the guide line 7, the train line 15, and the receiving antenna 10, and is demodulated to the original voice signal.

On the other hand, the mobile station on-board device 12 modulates a voice signal into a high frequency current (signal S2) having a second guided radio frequency f2 (for example, 180 kHz) and electromagnetically radiates it from the transmitting antenna 11 to the train line 15. Inductively coupled. After that, the signal S2 is transmitted to the guide line 7 by the base station call reception wave (signal S2R:
As shown in FIGS. 2 and 3, the signal S2R is inductively coupled (received), demodulated into an audio signal by each base station device and satellite reception station, and transmitted to the operation command station 1.

Further, the operation command station 1 transmits an alarm signal (emergency alarm signal) to each of the base station devices 2a, 2b and 2c,
Each of the base station devices 2a, 2b and 2c modulates the alarm signal into a high frequency current (signal S3) having a third inductive radio frequency f3 (for example, 143 kHz), and the inductive line 7, train line 15, and receiving antenna 10 are To the mobile station on-board device 12 via
(Receive) On the other hand, the mobile station on-board device 12 also generates a signal S3 obtained by modulating an alarm signal, electromagnetically radiates it from the transmitting antenna 11, transmits it via the train line 15 and the guide line 7, and demodulates it by the base station device. The signal is transmitted to the operation command center 1.

The first to third sections of the guide line 7 are constructed as follows. The first section (section on the left side of Fig. 1) is
A guide line 7a is provided, and a line coupler (starting coupler) 4a is connected to one end of the guide wire 7a and a line coupler (terminating coupler) 5a is connected to the other end. The base station device 2a is connected to the line coupler 4a. The minus (-) side of the line coupler 4a and the terminating coupler 5a is grounded, and a ground return circuit for the induced radio wave (high frequency current) flowing through the induction wire 7a is formed. The line coupler 4a causes the signal S1 from the base station device 4a to flow through the guide line 7a, thereby inductively coupling the signal S1 to the train line 15. Also, the line coupler 4a is
Signal S2R that is inductively coupled from train line 15 to guide line 7a
Is detected and input to the base station device 4a. At this time, the line coupler 4a can detect the signal S2R (high frequency current) inductively coupled to the induction line 7a by the earth return circuit regardless of the direction. The base station device 2a includes a demultiplexer,
Equipped with a call receiver, alarm receiver, call / alarm transmitter, etc., the call / alarm transmitter receives voice signals and alarm signals from the operation command center 1 through the communication line (voice line) 8. ,
The signals S1 and S3 are modulated and output to the line coupler 4a.
On the other hand, the base station device 2a receives the signals S2R and S3 from the line coupler 4a at the call receiver and the alarm receiver, demodulates them into voice signals and alarm signals, and transmits them to the operation command station via the communication line 8. Transmit to 1.

The third section (the section on the right side of FIG. 1) has the same structure as the first section. That is, the third section is composed of the induction wire 7c having the line coupler 4d connected to one end and the termination coupler 5b connected to the other end, and the minus (-) side of the line coupler 4d and the termination coupler 5b is It is grounded. Line coupler 4
d is connected to the base station device 2c, and the base station device 2c has the same configuration as the base station device 2a. In the third section, bidirectional communication (transmission / reception of signals S1, S2 (S2R), S3) between the driving command station 1 and the railway vehicle 13 is possible by the same operation as in the first section.

The second section (the middle section in FIG. 1) is constructed as follows in order to obtain a voice signal obtained by demodulating the good quality signal S2R. The second section includes line couplers 4b and 4
At least one frequency-separation-type coupler 6 is inserted in the guide wire 7b between c. In other words, the second
The inductive line of the section is configured by N-1 (N is a natural number of 1 or more) frequency discriminative couplers 6 in which N inductive lines are connected in series. In the example shown in FIG. 1, the induction line in the second section is configured by one frequency-separating coupler 6 connecting two induction wires 7b-1 and 7b-2 in series. There is.

The line coupler 4b is used for the base station device (TR station) 2
The line coupler 4c is connected to the satellite receiving station (R
Station) 3a, and the frequency separation coupler 6 is connected to the satellite receiving station (RR station) 3b. The base station device 2b, the satellite receiving station 3a, and the satellite receiving station 3b are connected through a communication line (voice line) 9. The base station device 2b includes a channel comparison circuit 30A (see FIG. 2) in addition to the configuration of the base station device 2a. The satellite receiving station 3a is provided with at least a configuration for controlling the receiving function of the signal S2R (call receiver (receiving circuit) 29B: see FIG. 2) among the configurations of the base station device 2a. It has a function of receiving S2R, demodulating it into a voice signal, and transmitting it to the base station device 2b.

FIG. 2 shows a frequency separating / combining device 6 according to the present invention.
3 is a diagram showing an embodiment of a satellite reception station 3b. FIG.
In FIG. 2, the frequency discriminator 6 includes a base station call transmission wave (signal S1: 130 kHz) and a signal S3 (143 kHz).
Hz) and the base station call reception wave (signal S2R: 18
Filter group 23 having a blocking type of 0 kHz) and signal S2
Is a pass type filter and filters S1 and S3 are a block type filter group 24 and 24 ', and transformers 31 and 32.

The filter group 23, as shown in FIG.
And the frequency pass type filter circuit 26 of S3,
The band-stop type filter circuits 25 and 25 'are connected in series so as to be sandwiched between the filter circuits 25 and 25'. The filter circuit 25 'is connected to the induction line 7b-1 via the transformer 31 and the filter 25 is transformed. Guide wire 7b-2 through the device 32
It is connected to the. With this configuration, the filter group 23
Is one or the other of the two guide wires (guide wire 7b-1 or guide wire 7b) connected to itself by the filter circuit 26.
-2) allows the base station call transmission wave (signal S1) from the other side to pass through to the other or one side (guide line 7b-2 or guide line 7b-1), and by the filter circuits 25, 25 ', guide line 7b-1 and 7b-2 is a base station call reception wave (signal S2
R) is blocked. Therefore, the guide line (second section) between the line couplers 4b and 4c is the base station call transmission wave (signal S1).
On the other hand, one section is formed for the base station call reception wave (signal S2R), while N (two) reception sections (guide line 7b-) for each of the guide lines 7b-1 and 7b-2. 1) and a second reception section (corresponding to the guide line 7b-2). In this way, the frequency discriminator 6
The filter circuit 23 of No. 1 functions as N-1 dividing means according to the present invention. Then, the first reception section is assigned as a coverage section of the base station device 2b,
b receives the signal S2R inductively coupled to the induction line 7b-1 via the line coupler 4b. On the other hand, the second reception section is assigned as the coverage section of the satellite reception station 3a, and the satellite reception station 3a receives the signal S2R inductively coupled to the induction line 7b-2 via the line coupler 4c.
As described above, at least one receiving circuit (call receiver: receiving device) for receiving the signal S2R inductively coupled to the reception section is provided in each of the N reception sections.

Further, the transformers 31 and 32 respectively invert the phases of the signals S1 and S3 that have passed through the filter group 23 and the signals S1 and S that flow through the guide lines 7b-1 and 7b-2.
Adjust so that 3 (guide radio wave) is in phase.

In this embodiment, another receiving circuit (call receiver) is provided in each of the first and second receiving sections. Therefore, the frequency separation type coupler 6
Has the following configuration. That is, the filter group 24, 24 '
Each of which is constituted by connecting in series a band stop type filter circuit 27 (27 ') that blocks the signals S1 and S3 and a frequency pass type filter circuit 28 (28') that passes the signal S2R. The input end of the filter group 24 'is connected to the secondary side of the transformer 31, and the guided radio wave input to the filter group 23 from the induction line 7b-1 is branched and input to the filter circuit 27'. It is like this. The filter group 24 is connected to the secondary side of the transformer 32,
The guided radio wave input to the filter group 23 from the guide line 7b-2 is branched and input to the filter circuit 27. In this way, the frequency discriminator 6 has the signal S2R from the one induction line 7b-1 and the other induction line 7b-.
The signals S2R from 2 are output respectively.

The satellite receiving station 3b is the base station device 2a.
And the receiver circuits 29, 29 'of the signal S2R having the same function as the call receivers (receiver circuits 29A, 29B) installed in the satellite receiver station 3 and the channel comparison circuit (CHSE).
L: channel selector) 30.

The input end of the receiving circuit 29 'is connected to the output end of the filter group 24' of the frequency division type coupler 6 via the connecting line 12 ', and the input end of the receiving circuit 29' is connected to the frequency via the connecting line 12. It is connected to the output end of the filter 24 of the fractional coupler 6. Each of the receiving circuits 29 and 29 ′ demodulates the signal S 2 R input thereto into an audio signal and inputs it to the channel comparison circuit 30.

The guide wire 7b-1 is connected to the line coupler 4b.
And a signal S2R which forms a part of the earth return circuit via the frequency division type coupler 6 and is inductively coupled to the induction line 7b-1.
Is detected by the line coupler 4b and the frequency separation coupler 6 almost at the same time regardless of the direction, and the base station device 2
The reception circuit 29A of b and the reception circuit 29 'of the satellite reception station 3b receive the signals substantially at the same time. Similarly, the guide wire 7b
-2 forms a part of the earth return circuit via the line coupler 4c and the frequency division type coupler 6, and the signal S2R inductively coupled to the induction line 7b-2 has a direction in which it flows through the induction line 7b-2. In either case, the line coupler 4c and the frequency discriminator 6 detect the signals almost at the same time, and the receiving circuit 29B of the satellite receiving station 3a and the receiving circuit 29 of the satellite receiving station 3b are detected.
Will be received at about the same time.

Here, the frequency discriminator 6 is connected to the signal S
It has a transformer (not shown) for inverting the phase of 2R
In the section, each receiving circuit 29, 29 ', 29A, 29B
Respectively receive the signals S2R having the same phase. As described above, the guided wireless communication system according to the present embodiment has the phase adjusting means. The transformer that inverts the phase of the signal S2R may be provided in the line coupler.

In this way, the signal S2R from the first reception section is transmitted to the base station device 2b and the satellite reception station (RR station).
The receiving circuit 29 'of 3b handles the signal S2R from the second receiving section by the receiving circuits 29 of the satellite receiving station (R station) 3a and the satellite receiving station (RR station) 3b. One of the call receivers (reception circuits) 29 and 29B described above corresponds to "at least N-1 receiving devices" in the present invention.

In this way, the signal S2R inductively coupled from the train line 15 to the guide line in the second section is the base station device.
(TR station) 2b receiving circuit 29A, satellite receiving station (R
Station) 3a receiving circuit 29B, satellite receiving station (RR station)
The signals are received by the four stations of the receiving circuits 29 and 29 'of 3b. Then, the signals S2R received by these four stations are demodulated into audio signals, respectively. At this time, each of the receiving circuits 29, 29 'and 29B of the satellite receiving stations 3a and 3b functions as a receiving device. Then, the demodulated audio signal having the highest quality is extracted as the audio signal to be transmitted to the driving command station 1. Therefore, it has the following configuration.

The channel comparison circuit 30 of the satellite reception station 3b receives the audio signals output from the reception circuits 29 and 29 ', compares the signal levels thereof, and outputs the higher audio signal. As a result, the voice signal having the better signal-to-noise ratio (S / N) of the signal S2R is extracted, and the channel comparison circuit 3 of the base station device 2b is extracted through the communication line 9.
Input to 0A. The channel comparison circuit 30A includes the audio signal from the reception circuit 29A and the satellite reception station 3a.
The audio signal from the receiving circuit 29B is also input, and the input audio signals are compared with each other to extract the audio signal with the best signal-to-noise ratio (S / N) (the best quality). To do. As described above, the channel comparison circuit 30A has the most signal-to-noise ratio (S / N) of the base station call reception wave (signal S2R) among the voice signals demodulated by the base station apparatus and the reception apparatus.
Functioning as an extracting means for extracting a good signal as a voice signal to be transmitted to the operation command station 1.

Further, the channel comparison circuit 30A includes
Audio signals from the base station devices 2a and 2c in the sections (first and third sections) adjacent to the base station apparatus 2b are input, and the extracted audio signals and these audio signals are input. By comparison, the one with the better signal-to-noise ratio (S / N) is extracted, and the extracted voice signal is transmitted to the operation command center 1 through the communication line 8. In this way, the voice signal obtained by demodulating the signal S2R having the best signal-to-noise ratio (S / N) in the first to third sections is extracted and transmitted to the operation command center 1.
Therefore, the driving command center 1 can receive the audio signal obtained by demodulating the signal S2R of the highest quality among the signals S2 inductively coupled to the induction line 7.

The above structure can be modified as follows. For example, the signal S that is inductively coupled to the guide line 7b-2
Since 2R is received by the receiving circuit 29, the satellite receiving station 3b (receiving circuit 29B) can be omitted. Further, the channel comparison circuit 30 is omitted, and each reception circuit 2
The voice signal output from 9, 29 'may be input to the channel comparison circuit 30A of the base station device 2b through the communication line 9. Furthermore, the comparison of the audio signals between the base station devices may be performed by a base station device other than the base station device 2b.

Next, an operation example of the above-mentioned communication system will be described. A case where voice communication (call) is performed between the operation command station 1 and the mobile station on-board device 12 mounted on the railway vehicle 13 will be described.

When a voice is emitted at the operation command station 1, a voice signal (electrical signal) corresponding to the voice is generated and input to each base station device 2a, 2b, 2c via the communication line 8.
Then, the transmission modulation circuit of each base station device 2a, 2b, 2c
The signal is converted into a signal S1 (high frequency current) having the induction radio frequency f1 by the (call / alarm transmitter), and the line couplers 4a, 4
b, 4d to guide wires 7a, 7b (7b-1 and 7b-2),
7c, while being transmitted (energized) to each of the guide wires 7a, 7b,
It is electromagnetically radiated from 7c and is once guided to the train line 15.
The signal S1 guided to the electric train line 15 is further inductively coupled to the receiving antenna 10 of the mobile station on-board device 12. The signal S1 inductively coupled to the receiving antenna 10 is input to the mobile station on-board device 12, demodulated by this receiving circuit (not shown), converted into a voice signal, and output from a speaker (not shown). As a result, the crew member of the railway vehicle 13 can hear the voice (instruction or command) of the commander or the like from the driving command center 1.

On the other hand, when a voice to be transmitted to the operation command station 1 is emitted in the railcar 13, the mobile station onboard device 12 generates a voice signal (electrical signal) corresponding to the voice, and this voice signal moves. The signal S2 is transmitted by the transmission modulation circuit of the local on-board device 12.
(High-frequency current), electromagnetic radiation is emitted from the transmitting antenna 11, is once guided to the train line 15, and then the guide line 7
To the signal S2R.

Here, the guide radio frequency f2 emitted from the transmitting antenna 11 of the mobile station on-board device 12 to the train line 15 is used.
The signal S2 having is electromagnetically coupled to the electric line 15 and is also electromagnetically connected to another adjacent conductive line (for example, an electric line running in the opposite direction, a feeder line laid along the line, a communication line, etc.). Be induced. Therefore, in addition to the guided radio wave f2 ′ (direct coupling component) from the train line 15, the guide line 7 has the same frequency but different phases f2 ″, f (not shown).
Inductive radio waves (indirect coupling component) such as 2 ″ ′ ... Are also simultaneously received from other conductors.

The guide line 7 is divided into substation units, station units, or units of several km to several tens of km (substation 14 units in FIG. 1). For example, the transmitting antenna 11 of the railway vehicle 13 shown in FIG. The signal S2 emitted from the vehicle is received by the guide wire 7b in the section (here, the second section) in which the railroad vehicle 13 travels via the train line 15 as described above. At this time, if the train line 15 is divided so as to overlap the traveling section and a section different from this (when the section division of the train line 15 and the section division of the guide line 7 do not match), The signal S2 of 1 is received almost simultaneously by the guide lines in different sections (for example, the guide lines 7a and 7c shown in FIG. 1). Moreover, these guide wires 7a, 7b and 7c
As described above, other conductors (for example, feeders, power lines,
A signal (indirect coupling component) with the same frequency but different phase and reception level is also received from a communication line).

In this way, the guide line 7 receives the signal S2R in which the direct coupling component from the train line 15 and the indirect coupling component from another conductor are mixed. The direct coupling component does not depend on the length of the guide line 7 (it does not change depending on the length of the guide line 7), but the indirect coupling component tends to increase as one section of the guide line 7 increases. This is because there is a tendency for the number of other conductors, which are the bases for generating the indirect coupling component, to be increased near the train line 15. The mixture of the direct coupling component and the indirect coupling component results in the fluctuation of the reception level of the signal S2R, and if the level is remarkably lowered, a proper voice signal cannot be obtained and the voice command interruption in the operation command center 1 is caused. Next, it will interfere with the command work.

On the other hand, in this embodiment, as shown in FIG. 1, in the second section, the frequency division type coupler 6 is inserted in the guide wire 7b between the line coupler 4b and the line coupler 4c, An indirect coupling component flows from the induction line 7b-1 to the frequency separation coupler 6 and flows to the induction line 7b-2, and an indirect coupling component is induced from the induction line 7b-2 to the frequency separation coupler 6 Block flow to line 7b-1. Accordingly, the second section is divided into the first reception section and the second reception section with respect to the signal S2R, and the signal S2 generated by the reception circuit is obtained.
The length of the R service section is shortened. For this reason,
The guide line 7b-1 does not have to receive the indirect coupling component inductively coupled with the guide line 7b-2, and the guide line 7b-2 does not have to receive the indirect coupling component inductively coupled with the guide line 7b-1. Therefore, the indirect coupling component inductively coupled to each of the guiding lines 7b-1 and 7b-2 is reduced, and the base station device 2b and each of the satellite receiving stations 3a and 3b (each receiving circuit 29, 29 ', 29).
A and 29B) can receive the directly coupled component with reduced or no influence by the indirect coupled component as signal S2R. Then, each receiving circuit 29, 29 ′, 29
The signal S2R received by A and 29B is demodulated into a voice signal, and a signal with a good signal-to-noise ratio (S / N) (a signal that is less influenced by the indirect coupling component) is extracted and further extracted from the base station devices 2a and 2c. Is compared with the voice signal, and the one having a good signal-to-noise ratio (S / N) is transmitted to the operation command station 1. Therefore, it is possible to stabilize the reception level of the signal S2R, prevent interruption of a call (voice) from the railway vehicle 13 (mobile station on-board device) to the operation command station 1, and transmit appropriate information. Becomes

According to this embodiment, as described above, it is possible to stabilize the reception level of the signal S2R and improve the quality of the audio signal transmitted to the operation command station 1. As a configuration for this, instead of increasing the section of the guide line 7 and providing the base station apparatus (TR station) 2 in each section, a frequency division type coupler 6 is prepared to provide a conventional signal S2R reception section. It is further divided into a plurality of receiving sections, and a satellite receiving station (R station or RR station) is provided if necessary. Since the cost of the frequency division type coupler 6 and the satellite receiving station is lower than that of the base station apparatus, without significantly increasing the cost,
The reception level of the signal S2R can be stabilized. Further, when installing the frequency division type coupler 6 and the satellite receiving station 3b, it is not necessary to change the arrangement of the base station device 2b and the satellite receiving station 3b that exist conventionally, so that the cost required for constructing the communication system can be suppressed. be able to.
Further, since the transmission processing for the base station call transmission wave (signal S1) is performed in the same section as the conventional one, the existing base station apparatus (TR station) can be used as it is, and the base station can be changed when the system is changed. No need to add equipment.

In the above-described embodiment, one frequency division type coupler 6 is provided for the induction line (one section: the second section in FIG. 1) between the line couplers to divide the reception section into two. At the same time, a satellite receiving station (RR station) 3b having two receiving circuits 29, 29 'is provided so that the signal S2R is received by four stations in the second section. The present invention is not limited to this configuration, and the number of frequency division type couplers 6 may be provided as long as the reception circuit is provided for each reception section divided by the frequency division type coupler 6 (dividing means). (Number of divided reception sections) can be set as appropriate.

FIG. 3A shows an example in which one frequency division type coupler 6 is provided for the conventional second section shown in FIG.
In this case, the signal S2R in the first reception section is received by the base station device 2b, and the signal S2R in the second reception section is received by the satellite reception station 3a (two-station reception).

FIG. 3B is a diagram showing an example in which three frequency division couplers 6 are inserted into the conventional second section induction line shown in FIG. 5, and N = 4 induction lines 7b. -1,7b-
It is a figure which shows the example divided into the 1st-4th receiving area in which 2,7b-3 and 7b-4 were connected in series by the frequency division type coupler 6 of N-1 = 3. In FIG. 3B, the satellite receiving station 3b (RR station) is connected to the center frequency division type coupler 6 and the signal S2 of the second and third receiving sections is received by the receiving circuits 29a and 29 'of the satellite receiving station 3b. Are received by each. Then, the base station device 2b (T
The R station) receives the signal S2R in the first reception section, and the satellite reception station 3a (R station) receives the signal S2R in the fourth reception section. In the configuration of FIG. 3B, the satellite receiving station 3
Instead of b, two receiving circuits may be connected to any one of the frequency division type couplers 6 so as to receive the signals S2R in the second and third receiving sections, respectively. However,
The configuration shown in FIG. 4B is the simplest system configuration in four divisions, and management is easy.

Further, in the embodiment shown in FIGS. 1 and 2, an example in which the frequency discriminator 6 and the satellite receiving station 3b are configured as separate devices has been shown, but as shown in FIG. , A satellite receiving station 34 incorporating the configuration (filter group 23, 24, 24 ') of the frequency division type coupler 6
, The two induction wires are connected by the coupler 33, and the end of the transformer 31 in the coupler 33 on the secondary side with respect to the induction wire 7b-1 is connected to one end of the filter group 23. The end portion on the secondary side with respect to the guide wire 7b-2 of FIG.
May be connected to the other end of the. In this case,
Filter group 2 in combiner 33 and satellite receiving station 34
3 functions as a dividing means.

[0058]

According to the present invention, it is possible to suppress the influence of the indirect coupling component while suppressing the cost increase and to perform the communication by the stable received wave of the base station call.

[Brief description of drawings]

FIG. 1 is a block system explanatory diagram showing an embodiment of a guided wireless communication system according to the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the frequency division type coupler and satellite receiving station (RR station) shown in FIG.

FIG. 3 is an explanatory diagram of a modified example of the embodiment.

FIG. 4 is an explanatory diagram of another embodiment.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

S1 base station call transmission wave S2 mobile station on-board call transmission wave S2R base station call reception wave 1 Operation command center 2b Base station device 3a, 3b, 33 satellite receiving stations 4b, 4c line coupler 6 Frequency separation type coupler 7b Induction line (induction line between line couplers) 7b-1, 7b-2 Lead wire (N lead wires) 10 receiving antenna (mobile station on-board antenna) 11 Transmit antenna (mobile station on-board antenna) 12 Mobile station on-board equipment 15 train lines 23 Filter group (dividing means) 24,24 'filter group 25,25 ', 27,27' band stop type filter circuit 26,28,28 'Frequency pass filter circuit 29, 29 ', 29A, 29B receiver circuit 30,30A channel comparison circuit 31,32 transformer 33 combiner

Continued front page    F-term (reference) 5H161 AA01 CC20 DD21 DD41                 5K012 AB03 AB12 AC02 BA02 BA10                 5K067 AA41 EE02 EE10 EE39 GG01                       GG11 HH22

Claims (5)

[Claims] 1. A guide line arranged along a train line and provided between line couplers, a base station device connected to the guide line via one of the line couplers, and a mobile unit mounted on a train. Including a station on-board antenna and a mobile station on-board device,
The base station device modulates a voice signal from the driving command station into a base station call transmission wave having a first guide radio frequency and transmits the base station call transmission wave to the guide line. The base station call transmission wave is transmitted from the guide line to the train line. Is inductively coupled to the mobile station onboard antenna from the trolley line and is received and demodulated by the mobile station onboard device, and the mobile station onboard device transmits a voice signal to a mobile station having a second inductive radio frequency. A mobile station on-board communication transmission wave is modulated and transmitted from the mobile station on-board antenna, and the mobile station on-board communication transmission wave is inductively coupled to the train line and guided from the train line to the guide line as a base station call reception wave. In the communication system using the induction radio, the base station call reception waves are combined and received and demodulated by the base station device. In the induction radio communication system, N (N is a natural number of 1 or more) induction lines are connected in series. Configure the track and connect to yourself To pass the base station call transmission wave from one or the other of the two guiding lines to the other and to prevent the passage of the base station call receiving wave input from one and the other of the two guiding lines. And N-1 dividing means that divides the guide line into one section for the base station call transmission wave and divides the base station call reception wave into N receiving sections for each guide line. At least N-1 receiving devices that receive waves and demodulate them into voice signals, and a signal-to-noise ratio (S / S) of the base station call reception wave that is the most of the voice signals demodulated by the base station device and the receiving device. N) is further included as an audio signal to be transmitted to the operation command station, and the base station device corresponds to an induction wire directly connected to a line coupler connected to the base station device. Is responsible for the reception section that Receiving the base station call reception wave, the at least N−1 receiving devices are respectively in charge of the intervals other than the interval in which the base station device is in charge, and the base station from the guide line corresponding to the receiving interval in which they are in charge. An inductive wireless communication system, which receives a call reception wave. 2. The frequency dividing type filter circuit for passing the base station call transmission wave from each of the two guiding lines, and the base station call receiving wave from each of the two guiding lines. 2. The inductive wireless communication system according to claim 1, further comprising a band-stop type filter circuit for blocking. 3. Two dividing devices are connected to the dividing means, and the dividing means inputs the base station call reception wave input from one of the two guiding lines to one of the two receiving devices. In addition, by inputting the base station call reception wave input from the other to the other of the two receiving devices, the one reception device receives the base station call reception wave from the reception section corresponding to the one guiding line. 3. The guided wireless communication system according to claim 1, wherein the other receiving device receives the base station call reception wave from the receiving section corresponding to the other guiding line. 4. The base station device and the at least N−
4. The guided wireless communication system according to claim 1, further comprising phase adjusting means for adjusting the phase of the base station call reception wave so that the base station call reception wave received by one receiving device is in phase. . 5. A guide line arranged along a train line and provided between line couplers, a base station device connected to the guide line via one of the line couplers, and a mobile unit mounted on a train. Including a station on-board antenna and a mobile station on-board device,
The base station device modulates a voice signal from the driving command station into a base station call transmission wave having a first guide radio frequency and transmits the base station call transmission wave to the guide line. The base station call transmission wave is transmitted from the guide line to the train line. Is inductively coupled to the mobile station onboard antenna from the trolley line and is received and demodulated by the mobile station onboard device, and the mobile station onboard device transmits a voice signal to a mobile station having a second inductive radio frequency. A mobile station on-board communication transmission wave is modulated and transmitted from the mobile station on-board antenna, and the mobile station on-board communication transmission wave is inductively coupled to the train line and guided from the train line to the guide line as a base station call reception wave. In the communication system using the guided radio, the base station call reception wave is combined and received and demodulated by the base station device. The base station call transmission wave from one or the other of the two guide lines connected to itself. To the other or one By allowing the base station call reception wave input from one and the other of the two guide lines to pass, the guide line is set as one section with respect to the base station call transmission wave and the base station call reception wave. Is divided into N (N is a natural number of 1 or more) reception sections for N-1
The N dividing lines are connected in series by the dividing means to form the guiding line, and the base station device is in charge of a receiving section corresponding to the guiding line directly connected to the line coupler connected to itself. It is configured to receive a base station call reception wave from this receiving section, prepares at least N-1 receiving devices, and these receiving devices are respectively responsible for the intervals other than the interval for which the base station device is responsible, and Is configured to receive a base station call reception wave from a guide line corresponding to a reception section that the terminal is in charge of and demodulate into an audio signal, and the audio signal demodulated by the base station device and the at least N-1 receiving devices. An inductive wireless communication method, wherein the one having the best signal-to-noise ratio (S / N) of the call received wave of the base station is extracted as a voice signal to be transmitted to the operation command station.