JP2000286758A - Communication system using feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a communication system that surely controls operations of trucks in a large scale carrying system. SOLUTION: A feeder 2 is installed along guide rails 1 to guide a truck 10. A base station 20 controls the operation of the truck 10. A signal to be sent from the base station 20 to the truck 10 is distributed to a plurality of couplers 32a-32d by a distribution booster 31. The couplers 32a-32d superimpose a signal given to the distribution booster 31 on the feeder 2. The truck 10 uses a coupler 11 to pick up the signal superimposed on the feeder 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for performing communication between a base station and a mobile using a power supply line provided along a guide rail for guiding the mobile.

[0002]

2. Description of the Related Art In recent years, in factories and warehouses, transport systems for transporting cargo and various parts unattended have been introduced.

[0003] As one type of this type of transport system, a system in which a moving body such as a bogie is run along a guide rail while power is supplied to a moving body such as a bogie in a non-contact manner from a power supply line provided along the guide rail. It has been known. In this method, a high-frequency alternating current is usually applied to the power supply line. on the other hand,
Each moving body is provided with a coil for extracting energy from the alternating current applied to the power supply line by electromagnetic induction. Then, each moving body travels using the energy or performs a cargo handling operation.

[0004] The operation of each mobile unit follows an instruction given from a base station. Various methods are conceivable as a method of giving an instruction from a base station to each mobile unit, and the applicant of the present application has proposed a communication system for transmitting a signal using a power supply line for supplying energy to the mobile unit. Has been proposed.

FIG. 11 is a configuration diagram of an example of a communication system using a power supply line. In this communication system, the operation of each carriage follows an instruction from the base station. Guide rail 101
Is provided on the route on which each truck 120 travels. The power supply line 102 is laid along the guide rail 101 such that the forward path and the return path are parallel to each other. The power supply device 103 supplies a high-frequency alternating current to the power supply line 102. As a result, the magnetic field near the power supply line 102 always changes in accordance with the high-frequency alternating current.

[0006] The base station 110 includes a computer 111, a modem 112, and a coupler 113, and controls the operation of each truck 120. The computer 111 communicates with a control circuit 125 provided in each of the carts 120 to communicate with each of the carts 1.
20 is controlled. The modem 112 modulates the signal output from the computer 111 and provides the same to the combiner 113, and demodulates the signal picked up by the combiner 113 and provides the same to the computer 111. Coupler 113
Superimposes a signal provided from the modem 112 on the power supply line 102 by capacitive coupling or the like, and picks up a signal superimposed on the power supply line 102 and provides the signal to the modem 112. With this configuration, base station 110 superimposes a signal to be transmitted to each truck 120 on feeder line 102 and picks up a signal output from each truck 120 from feeder line 102.

The truck 120 includes a coil 121, a power supply circuit 1
22, coupler 123, modem 124 and control circuit 12
5 is provided. The coil 121 extracts energy from a magnetic field near the power supply line 102. The power supply circuit 122 generates a predetermined voltage from the energy extracted by the coil 121, and supplies the generated voltage to the traveling motor of the carriage 120 and each circuit of the carriage 120. Combiner 123 and modem 124
Is basically the coupler 1 provided in the base station 110.
13 and the modem 112. Control circuit 125
Follows the instructions given by the base station 110,
0 operation is controlled.

As described above, the communication system shown in FIG. 11 superimposes a signal to be transmitted / received between the base station and the truck on the feeder line, thereby realizing communication between them, and controlling the operation of each truck. It is controlled remotely from the base station. The configuration and operation of this system are described in
-126319.

[0009]

However, when the above-described transport system is introduced into a large-scale factory or warehouse, the guide rail and the power supply line laid thereon are inevitably long. However, as is well known, a signal propagated through a conductor attenuates as its transmission path becomes longer. Therefore, when the length of the guide rail and the length of the feeder line laid thereon are increased with the increase in the size of the transport system, communication between the base station and the bogie located far from the base station becomes difficult.

In order to solve this problem, for example,
A method of increasing the amplitude of the transmission signal is considered. However, in a method of superimposing a signal on a power supply line by capacitive coupling, there is a limit to increasing the amplitude of a transmission signal. Also, if the amplitude of the transmission signal can be made sufficiently large, the receiver of the base station or the bogie may be saturated in the communication between the base station and the bogie located near the base station.

As described above, in the existing communication system using the feeder line, when a large-scale transport system is constructed, there is a possibility that all the carts cannot be controlled reliably. An object of the present invention is to provide a large-scale transport system,
An object of the present invention is to provide a communication system capable of reliably controlling the operation of a bogie.

[0012]

SUMMARY OF THE INVENTION A communication system according to the present invention communicates with a base station using a power supply line provided for supplying energy to a mobile unit along a guide rail for guiding the mobile unit. Assuming a communication system that communicates with a mobile unit, a plurality of couplers that superimpose a signal provided to each mobile unit on a feeder line, and a signal to be transmitted from the base station to the mobile unit. Distributing means for distributing to the plurality of couplers.

According to the above configuration, the signal to be transmitted from the base station to the mobile unit is superimposed on the feeder at a plurality of points. Therefore, even when the guide rail and the feeder laid there are long, With the appropriate number of couplers at the appropriate locations, sufficient signal amplitude is obtained in all areas of the feeder. As a result, the mobile can always reliably receive the signal from the base station.

In the communication system having the above configuration, the feeder line is laid on the guide rail so that the forward path and the return path are parallel to each other, and the feeder is provided at a predetermined position between the plurality of couplers. Short-circuit means for short-circuiting the forward path and the return path of the power supply line at high frequency; and 1 each having a resistance value corresponding to the characteristic impedance of the power supply line and terminating the power supply line on both sides of the short-circuit means.
A pair of terminating means, wherein each distance between the short-circuit means and the terminating means is n / 4 (n is an odd number) times the in-line wavelength of a signal superimposed on the feeder line. I do.

According to this configuration, the signal superimposed on the feed line by a certain coupler is basically not transmitted to the feed line beyond the short circuit means. Therefore,
Signals superimposed on the feed line using a plurality of couplers do not interfere with each other. Further, since the terminating means is provided at a position which is n / 4 (n is an odd number) times the wavelength in the line of the signal from the short-circuit means, the influence of the reflection at the short-circuit means is eliminated. This stabilizes the level of the signal transmitted between the base station and the mobile.

Further, in the communication system having the above-mentioned configuration, the mobile unit detects whether or not the level of a signal superimposed on the feeder line by the base station is higher than a predetermined threshold level. And display means for displaying the detection result by the detection means.

According to this configuration, the level of the signal transmitted between the base station and the mobile unit is monitored by monitoring the display state of the display means only by moving the mobile unit along the guide rail. Can be checked over the entire route.

[0018]

FIG. 1 is a configuration diagram of a transport system to which a communication system according to an embodiment of the present invention is applied.
In FIG. 1, a guide rail 1, a power supply line 2, and a high-frequency power supply 3 are basically the same as the existing configuration. That is, the guide rail 1 is provided on a route on which the bogie travels, and the power supply line 2 is laid along the guide rail 1 such that the forward path and the return path are parallel to each other. And
The high-frequency power supply 3 supplies a high-frequency alternating current to the power supply line 2.

The cart 10 can be basically realized by the same configuration as an existing cart. That is, the coupler 11 picks up the signal superimposed on the power supply line 2 and superimposes the signal generated by the control circuit 13 on the power supply line 2. The coupler 11 picks up and superimposes the signal in a non-contact manner using capacitive coupling. Superimposed communication modem 1
2 modulates the signal supplied from the control circuit 13 and supplies the modulated signal to the coupler 11, and demodulates the signal picked up by the coupler 11 and supplies the demodulated signal to the control circuit 13. The control circuit 13 follows the instruction given from the base station 20 and
0 operation is controlled.

The trolley 10 further includes a non-contact power receiving unit 14 for extracting energy from the power supply line 2 in a non-contact manner, and performs traveling or various operations using the energy. The non-contact power receiving unit 14 includes a power receiving core 15 for obtaining electromotive force from a magnetic field generated in the vicinity of the power supply line 2, a rectifying unit 16 for rectifying an output of the power receiving core 15, and an output of the rectifying unit 16. D for obtaining a predetermined voltage
A C / DC converter 17 is provided.

The base station 20 includes a computer 21 and a superimposed communication modem 22 for controlling the operation of the cart 10. The computer 21 controls the operation of the trolley 10 by communicating with the control circuit 13 provided in the trolley 10. The superimposition communication modem 22 modulates the signal generated by the computer 21 and supplies the modulated signal to the distribution booster 31, and demodulates the signal supplied from the distribution booster 31 and supplies the signal to the computer 21.

The distribution booster 31 distributes the signal output from the base station 20 to the couplers 32a to 32d, and combines the signals picked up from the feeder line 2 by the couplers 32a to 32d to combine the signals. Send to In addition,
The distribution booster 31 has a function of amplifying a signal. The couplers 32a to 32d are attached to the guide rail 1 at predetermined intervals, superimpose signals supplied from the distribution booster 31 on the feeder line 2, and supply signals picked up from the feeder line 2 to the distribution booster 31, respectively. .
Between the distribution booster 31 and each of the couplers 32a to 32d,
For example, they are connected by a coaxial cable.

As described above, in the communication system of the present embodiment, the output signal of the base station 20 is distributed to the plurality of couplers 32a to 32d by the distribution booster 31, and the feeder line 2 is distributed by the plurality of couplers 32a to 32d. Is superimposed on Therefore, even if the length of the guide rail 1 and the length of the feeder line 2 laid on the guide rail 1 are increased with the increase in the size of the transport system, if an appropriate number of couplers are provided at appropriate positions, A sufficient signal amplitude can be obtained in all regions of the feed line 2. As a result, the cart 10 can always reliably receive the signal from the base station 20.

Similarly, a plurality of couplers 32a-32
32d, the truck 10 will be located near any of the plurality of couplers 32a-32d, and the output signal from the truck 10 will have at least one coupling before being attenuated. Reach the vessel. That is, the cart 10
Is picked up by any of the couplers with a sufficient amplitude and then sent to the base station 20. Therefore, the carriage 10 can reliably communicate with the base station 20.

FIG. 2 is a block diagram of the distribution booster 31. Here, the frequency f1 is assigned to the signal transmitted from the base station 20 to the truck 10, and
0 for the signal transmitted to the base station 20
Is assigned.

The demultiplexers 41 and 43 are frequency filters, and pass the signal of the frequency f1. Amplifier 42
Amplifies the output signal from the base station 20. The distributing / mixing unit 44 converts the signal amplified by the amplifier 42
Distribute to 2a-32d. The gain of the amplifier 43 is determined so as to compensate for the attenuation in the transmission path between the distribution booster 31 and the couplers 32a to 32d and the attenuation due to the signal distribution in the distribution / mixing unit 44, for example.
With the above configuration, signals output from the base station 20 are superimposed on the feeder line 2 at a plurality of locations with sufficient amplitude.

The distributing / mixing unit 44 includes couplers 32a to 32
The signals picked up by d are mixed. Signal mixing is, for example, addition of signal amplitudes. Duplexer 45
And 47 are frequency filters that pass signals of frequency f2. The amplifier 46 amplifies the output signal from the distribution / mixing unit 44. The gain of the amplifier 46 is determined, for example, so as to compensate for the attenuation in the transmission path between the distribution booster 31 and the couplers 32a to 32d. With the above configuration, a signal transmitted from the cart 10 to the base station 20 is transferred to the base station 20 with a sufficient amplitude.

FIG. 3 is a diagram showing a configuration for attaching the coupler to the guide rail. The coupler 32 (the coupler 32a
The shape of the arbitrary coupler of the power supply line 2 is the same as that of the support member used for laying the power supply line 2 on the guide rail 1. It has storage sections 51a and 51b for storing. However, for example, when the power supply line 2 is accommodated in the accommodation portions 51a and 51b,
There is provided an electrode plate (metal plate) for capacitive coupling with the electrode. Then, a transmission line connecting the distribution booster 31 and the coupler 32 is connected to each of the pole plates provided in the housing portions 51a and 51b via a coaxial cable and a matching circuit.

The guide rail 1 is provided with a groove for accommodating a support member provided with the coupler 32, and the support member is fixed at a desired position while being fitted into the groove. That is, the coupler 32 can be easily attached to a desired position on the guide rail 1, and is also used as a support member for laying the power supply line 2 on the guide rail 1.

In the communication system of the present embodiment, when it is desired to further increase the number of couplers, the distribution ratio of the distribution booster may be increased, or as shown in FIG. May be introduced in multiple stages. In the configuration shown in FIG.
If the distribution ratio in each distribution booster is 1: 4, up to 16 couplers can be provided.

When a plurality of identical signals are superimposed on a transmission line, the signals interfere with each other depending on conditions. Therefore, if a plurality of couplers 32a to 32d are provided on the feeder line 2 as in the above-described embodiment, the base station 2
There is a possibility that signals transmitted between 0 and the carriage 10 may interfere with each other. When interference occurs, the signal level fluctuates, and the communication state deteriorates.

In order to solve this problem, the communication system according to the present embodiment is provided with a termination circuit on the power supply line. Less than,
The termination circuit will be described. FIG. 5 is a diagram illustrating a method of providing a termination circuit in the communication system according to the present embodiment. The termination circuit 60 is provided at a predetermined position between the plurality of base station couplers. In the example shown in FIG. 5, it is provided at a substantially intermediate position between the coupler 32a and the coupler 32b.

The termination circuits 60 are provided on both sides of the short bar 61 for short-circuiting the forward path 2a and the return path 2b of the power supply line 2 using capacitive coupling, and are provided on both sides of the short bar 61 to terminate the power supply line 2 respectively. Termination resistors 62a and 62b are provided. The resistance values of the terminating resistors 62a and 62b are determined by the characteristic impedance of the feed line 2 respectively. Note that the characteristic impedance of the feeder line 2 depends on the diameter of the feeder line 2 and the distance between the forward path and the return path of the feeder line 2 laid in parallel with each other. On the other hand, the distance A between the short bar 61 and the terminating resistors 62a and 62b is n / 4 (n is an odd number) of the in-line wavelength of the signal superimposed on the feed line 2.
Double the distance.

In the above configuration, the signal superimposed on the feeder line 2 by the coupler 32a is basically propagated in a balanced mode using the forward path and the return path of the feeder line 2, but the short bar 61 is provided. Therefore, it is not propagated to the area B. Similarly, the signal superimposed on the feeder line 2 by the coupler 32b is not propagated to the area A. This is the same for the signal output from the truck located in the area A or the area B. As described above, when the terminating circuit 60 is provided, signal interference caused by providing a plurality of base station couplers is avoided.

The signal propagating through the feed line 2 is reflected by the short bar 61. However, the distance A between the short bar 61 and the terminating resistors 62a and 62b is n / 4 of the in-line wavelength of the signal superimposed on the feed line 2.
Since the distance is a multiple of (n is an odd number), the phase of the signal traveling from the coupler to the short bar 61 and the phase of the signal reflected by the short bar 61 match each other. Therefore, the signal transmitted and received between the base station and the bogie is not disturbed by the reflection at the short bar 61.

The termination circuit is provided not only between the couplers for the base stations but also at other positions (positions X and Y) as shown in FIG.
Etc.). However, at the end of the feeder line 2 as in the position X in FIG. 6A, it is not necessary to provide a terminating resistor on the power supply side as shown in FIG. 7A. When a coupler for the base station is provided at the end of the feeder line 2, a coupler may be attached instead of the terminating resistor as shown in FIG. 7 (b). In addition, as shown in a position Y in FIG. 6 (a), it is not necessary to provide a short bar at the folded portion of the feeder line 2 as shown in FIG. It is sufficient to provide a terminating resistor at a position distant from the terminal.

When there is a connecting portion between the guide rails 1a and 1a 'and the guide rail 1b, as shown in FIG. Located at the connection between the rails. In addition, a turntable is usually provided at the connecting portion, but a guide rail 1c independent of the guide rails 1a, 1a'1b is used on the turntable, and a power supply line is also laid on the guide rail 1c. You. In these cases, a termination circuit as shown in FIGS. 7 (a) to 7 (c) can be provided at the connecting portion.

The short bar 61 and the terminating resistors 62a and 62b are each formed using a support member used to lay the feeder line 2 on the guide rail 1, similarly to the coupler for the base station. . Therefore, short bar 6
1. The terminating resistors 62a and 62b can be easily installed similarly to the supporting members.

FIG. 8A is a configuration diagram of the short bar and the terminating resistor. As described above, the short bar and the terminating resistor have the same shape as the support member used for laying the power supply line 2 on the guide rail 1, respectively, and accommodate the forward path and the return path of the power supply line 2, respectively. Storage portions 71a and 71b. Housings 71a and 7
1b, an electrode plate (metal plate) for capacitively coupling with the power supply line 2 when the power supply line 2 is accommodated therein
72a and 72b are provided. Each electrode plate 72a and 72b is connected to point P and point Q, respectively, so as to be electrically short-circuited. Here, in the case of a short bar, the point P and the point Q are electrically short-circuited. On the other hand, in the case of a termination resistor, the point between the point P and the point Q is determined by the characteristic impedance of the feed line 2. A resistor having a different resistance value is provided.

By the way, when the feeder line 2 is accommodated in the accommodating portions 71a and 71b of the short bar and the terminating resistor, since the feeder line 2 is covered with an insulator, the electrode plates 72a and 72b There is no direct contact with the conductor, and the plates 72a and 72b and the feeder 2
, A capacitance C is generated. This capacity C is equal to the feed line 2
And the shape of the electrode plates 72a and 72b, etc., and cause reflection.

In this embodiment, in order to cancel the capacitance C, as shown in FIG.
An inductor L is provided between b and points P and Q. The inductor L has a value such that the LC circuit performs series resonance at the frequency of the signal transmitted between the base station and the bogie. As a result, a short bar having no reactance component and a terminating resistor are formed, the reflection in the terminating circuit is reduced, and the signal level is stabilized.

Further, the electrode plate 72a of the short bar
When the guide rail 1 is formed of metal, the short-circuit between the electrode plate 72b and the electrode plate 72b is a three-point short using the guide rail as shown in FIG. 8 (b). According to this configuration, the potential of the guide rail 1 can be considered to be always stable. Therefore, even if the transmission mode of the superimposed communication using the feeder line 2 is not a perfectly balanced mode, the potential of the guide rail 1 is used as a reference. (Eg, ground potential) signal transmission is realized. As a result, communication between the base station and the bogie is stabilized.

FIG. 9 is a diagram for explaining the effect of providing the termination circuit of the present embodiment. In FIG.
The level means a minimum level or a minimum amplitude at which a carrier (here, a signal) can be detected.

If the terminal circuit is not provided, interference between signals superimposed by a plurality of base station couplers or the influence of reflection appears. Therefore, as shown in FIG. The level of the signal transmitted through is unstable,
The margin for the CD level is small. On the contrary,
When the termination circuit is provided as in the communication system of the present embodiment, the interference and reflection are suppressed, so that the signal level is stabilized and the margin for the CD level is increased as shown in FIG. 9B. As a result, communication between the base station and the bogie is stabilized.

In the case where a termination circuit is provided, FIG.
As shown in (b), care must be taken because the signal level may decrease at the position where the termination circuit is provided. As described above, if the number of couplers for the base station provided on the feeder line is increased, the reliability of communication between the base station and the bogie is improved.
However, if the number of couplers is increased, the total cost for constructing the communication system is inevitably increased. Therefore, it is desirable that the number of couplers attached to the power supply line be the minimum as long as the reliability of communication can be ensured.

In order to ensure communication reliability, it is required that the signal level be equal to or higher than a certain value over the entire path of the power supply line. The level of the signal superimposed on the feed line can be detected, for example, by using a measuring instrument such as a spectrum analyzer. However, such a measuring instrument is expensive and inconvenient to carry. Measuring the signal level over a period of time is a very time-consuming task.

In the communication system of the present embodiment, in order to solve this problem, the carriage 10 has a function of displaying whether or not the reception level of the signal transmitted from the base station is equal to or higher than a predetermined threshold. The trolley 10 is caused to travel over the entire route, and by monitoring whether or not the signal reception level may be lower than a predetermined threshold value, it is determined whether or not communication reliability is secured. Find out.

FIG. 10A is a block diagram of the carriage 10. The RF / IF unit 81 converts the signal in the radio frequency band picked up by the coupler 11 into a signal in the intermediate frequency band and supplies the signal to the superimposed communication modem 12. Amplitude detector 82
Detects the amplitude of the signal picked up by the coupler 11 and notifies the superimposed communication modem 12 whether or not the amplitude is larger than a predetermined threshold. Display unit 83
Is based on the notification from the amplitude detector 82,
Indicates whether or not the amplitude of the signal picked up is larger than a predetermined threshold value. If the cart has a function of detecting the amplitude of a signal picked up by the coupler 11 for communication control or the like, a new amplitude detection unit 82 is used to generate a signal to be given to the display unit 83. It is not necessary to provide the function, and the function can be used.

The display unit 83 is, for example, an LED lamp as shown in FIG. 10B, which is turned on when the reception level is higher than a predetermined value, and when the reception level is higher than the predetermined value. "NG" that lights up when
Lamp ". Note that the LED lamps of the display unit 83 are arranged so as to be visible from the outside of the trolley 10, and the LED lamps are recognized by a user or the like even while the trolley 10 is running.

If the truck having the above configuration is used, the truck can be run along the guide rails and the display on the display unit 83 at that time can be monitored, and the level of the signal superimposed on the power supply line is sufficient. You can check if there is any over all routes. For this reason, the work of optimizing the arrangement of the couplers for the base station (for example, the work of installing the minimum necessary number of couplers for the base station) is simplified, and the working time can be reduced.

[0051]

According to the present invention, since a coupler for a plurality of base stations is provided on a feeder line, a sufficient signal amplitude can be obtained over all paths on the feeder line even in a large-scale transport system. . As a result, the mobile can always reliably receive the signal from the base station.

Further, since interference and reflection of a signal transmitted between the base station and the mobile unit can be suppressed, the level of the signal is stabilized, and the reliability of communication is improved. Further, since it is possible to easily check whether or not the level of the signal superimposed on the feeder line is sufficient over the entire path, the labor for installing and adjusting the coupler is reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a transport system to which a communication system according to an embodiment is applied.

FIG. 2 is a block diagram of a distribution booster.

FIG. 3 is a diagram showing a configuration for attaching a coupler to a guide rail.

FIG. 4 is a diagram illustrating a technique for increasing the number of couplers.

FIG. 5 is a diagram illustrating a method of providing a termination circuit.

FIG. 6 is a diagram illustrating a position where a termination circuit is provided.

FIG. 7 is a diagram illustrating a modified example of the termination circuit.

8A is a configuration diagram of a short bar and a terminating resistor, and FIG. 8B is a diagram illustrating a specific example of a short bar.

FIG. 9 is a diagram illustrating an effect obtained by providing a termination circuit.

FIG. 10 (a) is a block diagram of a bogie, and FIG.
It is an example of a display unit.

FIG. 11 is a configuration diagram of an example of a communication system using a power supply line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 guide rail 2 power supply line 2a power supply line forward path 2b power supply line return path 10 bogie 20 base station 21 computer 22 superimposed communication modem 31 distribution booster 32a-32d combiner 42, 46 amplifier 44 distribution / mixing unit 60 termination circuit 61 Short bar 62a, 62b Terminating resistor 82 Amplitude detector 83 Display

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[Procedure amendment]

[Submission date] March 27, 2000 (2003.
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoichi Ieoka 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 5K046 AA01 BA05 BB06 CC16 CC22 DD11 PP02 PP08 PS06 PS11 PS31 PS31 YY04

Claims (10)

[Claims] 1. A communication system for communicating between a base station and a mobile using a power supply line provided for supplying energy to the mobile along a guide rail for guiding the mobile. Wherein a plurality of couplers for superimposing a signal provided for transmission to the mobile unit on a feeder line, and a signal to be transmitted from the base station to the mobile unit are distributed to the plurality of couplers. A communication system comprising: distribution means. 2. A plurality of couplers each having a function of picking up a signal superimposed on a feeder line by a mobile unit, and mixing the signals picked up by the plurality of couplers to form a base station. The communication system according to claim 1, further comprising a mixing means for providing the information to the communication system. 3. The communication system according to claim 1, further comprising first amplification means for amplifying an input signal to said distribution means, and second amplification means for amplifying an output signal of said mixing means. 4. The communication system according to claim 1, wherein each of the plurality of couplers is incorporated in a support member for laying a power supply line on a guide rail. 5. The power supply line is laid on a guide rail such that a forward path and a return path are parallel to each other, and a forward path of the power supply line is provided at a predetermined position between the plurality of couplers. Short-circuit means for short-circuiting the power supply line and the return path, and a pair of terminating means each having a resistance value corresponding to the characteristic impedance of the power supply line and terminating the power supply line on both sides of the short-circuit means. The distance between the short-circuit means and the terminating means is set to n / 4 of the in-line wavelength of the signal superimposed on the feeder line.
2. The communication system according to claim 1, wherein the distance is a multiple of (n is an odd number). 6. The communication system according to claim 5, further comprising an inductor for canceling a capacitance between the short-circuit means and the power supply line. 7. The communication system according to claim 5, further comprising an inductor for canceling a capacity between the terminating means and the power supply line. 8. The communication system according to claim 5, wherein said short-circuit means is short-circuited to said guide rail. 9. A detecting means for detecting whether or not the level of a signal superimposed on a feeder line by the base station is higher than a predetermined threshold level, and detecting by the detecting means. The communication system according to claim 1, comprising: display means for displaying a result. 10. A communication system for performing communication between a base station and a mobile using a power supply line provided for supplying energy to the mobile along a guide rail for guiding the mobile. , A method of installing a coupler for superimposing a signal to be transmitted from the base station to the mobile unit on the feeder line, wherein one or more couplings of the signal to be transmitted from the base station to the mobile unit are performed. Superimposing on the power supply line using a device, detecting whether the level of the signal superimposed on the power supply line by the base station is higher than a predetermined threshold level in the mobile unit. Displaying the result, and driving the truck along the guide rail, and determining whether it is necessary to further provide the coupler in accordance with the display state at that time. Law.