JP3434027B2 - Ground equipment and vehicle control equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground device and a vehicle control device.

[0002]

2. Description of the Related Art In recent years, a vehicle control device, for example, an automatic train control device (hereinafter referred to as an ATC device) has a multi-view structure and a closed section is shortened from the viewpoint of enhancing transportation capacity. Therefore, it is difficult to visually confirm the indication of the terrestrial traffic light, and an in-vehicle traffic light is adopted instead of the terrestrial traffic light. As an example of an in-vehicle signal device of an ATC device, a vehicle speed signal device provided with an in-vehicle signal device is disclosed in Nippon Signal Technical Report (Vol. 15, published January 1991). The on-board traffic light displays the display information of the closed section in which the train travels, and does not display the display information of the closed section in front. Therefore, when the front closed section is in the low level, the front warning is given.

In such an ATC device, a ground device uses a non-resonant non-insulated track circuit, and separate carriers are used for ATC display information and notice information for forward notice. . The non-resonant non-insulated track circuit does not have a resonator for attenuating the carrier wave of the track circuit at the boundary portion of the track circuit, and allows the track circuit a plurality of carrier waves. Therefore, by changing the modulated wave as the presentation information as it is and changing it to a carrier wave for the advance notice, the indication information of the front closed section can be displayed as the front notice.

[0004]

However, the conventional ground device and vehicle control device have the following problems. (A) Because a different carrier is used for forward notice,
It cannot be applied to a resonance type non-insulated track circuit in which the carrier wave is limited to one wave. This is because the resonance-type non-insulated track circuit attenuates the carrier wave on the receiving end side by using the resonance circuit in order to clarify the closed boundary, and it is not allowed that two carrier waves exist. (B) Resonance-type non-insulated track circuits have been widely used in the past, and conventional equipment must be changed to non-resonance-type non-insulated track circuits for advance notice.

Therefore, an object of the present invention is to have one carrier wave and two waves.
It is to provide a ground device capable of transmitting control information of a type.

Another object of the present invention is to provide a vehicle control device capable of performing two types of vehicle control with one carrier wave.

Another object of the present invention is to provide a ground control device and a vehicle control device capable of performing two types of control with a small change in conventional equipment.

[0008]

In order to solve the above problems, the ground apparatus according to the present invention includes a track and a plurality of transmitters. The track is divided into a plurality of closed sections. The transmitter is individually connected to one end side of each of the closed sections, and includes a carrier wave generation circuit, a first modulated wave generation circuit, a second modulated wave generation circuit, an addition circuit, and a modulation circuit. Contains. The carrier wave generation circuit generates a carrier wave. The first modulated wave generation circuit generates a plurality of types of first frequency signals, and each of the first frequency signals has a frequency individually determined in correspondence with a plurality of first control information. There is. The second modulated wave generating circuit includes a second
Generating a frequency signal, the second frequency signal having a frequency different from the frequency of the first frequency signal, and
Is determined corresponding to at least one second control information,
The level is set lower than the level of the first frequency signal. The addition circuit outputs an addition signal obtained by adding the first frequency signal and the second frequency signal. The modulation circuit supplies a modulation signal obtained by modulating the carrier wave with the addition signal to the one end.

In a preferred example, the first control information is the announcement information of each closed section, and the second control information is the announcement notice information of the forward closed section.

In another preferred example, the frequency of the second frequency signal is set lower than the frequency of the first frequency signal.

In another preferred example, the frequency of the second frequency signal is set higher than the frequency of the first frequency signal.

In another preferred example, the level of the second frequency signal is 6 more than the level of the first frequency signal.
It is set lower by -10 dB.

In another preferred example, the second modulated wave generation circuit stores a display pattern of adjacent closed sections,
The vehicle detection signals of its own closed section and the adjacent closed section are input, and the change in the front closed section is predicted from the change in the vehicle detection signal and the display pattern to generate the second frequency signal.

The vehicle control device according to the present invention includes a ground device and an on-vehicle device. The ground device is the one described above. The on-board device receives the modulated signal transmitted from the ground device, demodulates the received modulated signal, decodes the first frequency signal and the second frequency signal, and outputs the first frequency signal. Control is performed according to the control information and the second control information.

In a preferred example, the on-board device includes a first processing circuit. The first processing circuit includes a detection circuit, an amplitude limiting circuit, and a plurality of determination circuits, detects the modulated signal received by the detection circuit and outputs a detection signal, and the amplitude limiting circuit Suppression is applied to the detection signal, and each of the determination circuits determines the first control information based on the presence / absence of a frequency signal having a frequency determined corresponding to each of the first control information.

In another preferred example, the on-board device includes a second processing circuit. The second processing circuit includes another detection circuit, a filter circuit, another amplitude limiting circuit,
And another decision circuit. The another detection circuit detects the received modulation signal and outputs a detection signal. The pass frequency band of the filter circuit is set to a frequency corresponding to the second control information. The another amplitude limiting circuit applies suppression to the detected signal that has passed through the filter circuit. The another determination circuit determines the second control information based on the presence / absence of a frequency signal having a frequency determined corresponding to the second control information.

In another preferred example, the detection circuit and the other detection circuit are the same.

[0018]

The track is divided into a plurality of closed sections. The transmitter is individually connected to one end side of each closed section. Therefore, it is possible to individually transmit a control signal for each block section and perform individual control.

The carrier wave generating circuit generates a carrier wave. The first modulated wave generation circuit generates a plurality of types of first frequency signals, and each of the first frequency signals is individually determined in correspondence with a plurality of frequencies of the first control information. Second
The modulated wave generation circuit of generates a second frequency signal,
The frequency signal is different from the frequency of the first frequency signal, and is determined corresponding to at least one second control information, and the level is set lower than the level of the first frequency signal. There is. The addition circuit outputs an addition signal obtained by adding the first frequency signal and the second frequency signal. The modulation circuit supplies a modulation signal obtained by modulating the carrier wave with the addition signal to one end. Therefore, the first frequency signal constitutes, for example, the announcement information, and the second frequency signal constitutes, for example, the announcement notice information. The control signal of each block section is a modulation signal by the addition signal of two waves of the presentation information and the announcement information. Therefore, when the on-board device receives the modulated signal and detects the signal, an addition signal of the presentation information and the announcement notice information is obtained, and by distinguishing the announcement information and the announcement notice information, the announcement information and The announcement notice information can be individually identified.
The on-board device can display the in-vehicle traffic light based on the display information, and can display the front notice based on the display notice information.
As a result, a ground device capable of transmitting two types of control information with one carrier wave can be obtained.

Since the level of the second frequency signal is set lower than that of the first frequency signal, when the modulated signals are received on the vehicle upper side, they do not mutually suppress each other, and the reception level is lowered. Does not happen. That is, it is possible to secure the reception level of the display information that is almost the same as that when the display information is modulated with one wave. As a result, the on-board device can receive the display information even as it is.

In a preferred example in which the frequency of the second frequency signal is set lower than the frequency of the first frequency signal, the low-pass filter makes it possible to discriminate the announcement information and the announcement information on the vehicle upper side. . In addition, distortion in modulation, demodulation, etc. is reduced and is less susceptible to noise.

In a preferred example in which the level of the second frequency signal is set to be 6 to 10 dB lower than the level of the first frequency signal, when the onboard device suppresses the detected signal,
The second frequency signal is suppressed by the first frequency signal and becomes smaller, and the first frequency signal is easily extracted. In addition, a certain level can be secured when the first frequency signal is attenuated more than the second frequency signal and the second frequency signal is extracted by suppression.

The ground equipment is the one described above. The on-board device receives the modulated signal transmitted from the ground device, demodulates the received modulated signal, decodes the first frequency signal and the second frequency signal, and outputs the first control information and the second control signal. Performs control according to the control information. This allows carrier wave 1
A vehicle control device that can perform two types of vehicle control by waves is obtained.

The on-board device includes a first processing circuit. The first processing circuit includes a detection circuit, an amplitude limiting circuit,
A plurality of determination circuits are included, the detection circuit detects the received modulated signal and outputs a detection signal, the amplitude limiting circuit applies suppression to the detection signal, and each determination circuit corresponds to each of the first control information. Then, the first control information is determined based on the presence / absence of the frequency signal having the determined frequency. In this preferred example, the addition signal of the first frequency signal and the second frequency signal becomes the detection signal, but as a result of suppression, the first frequency signal with the highest level is obtained, and the first frequency signal is added. The first control information transmitted can be specified by the determination output of the corresponding determination circuit. Moreover, since the reception level of the first frequency signal does not decrease, the same configuration as the conventional on-board device can be achieved.

The on-board device includes a second processing circuit. The second processing circuit includes another detection circuit, a filter circuit, another amplitude limiting circuit, and another determination circuit. Another detection circuit detects the received modulation signal and outputs the detection signal. The pass frequency band of the filter circuit is set to a frequency corresponding to the second control information. Another amplitude limiting circuit applies suppression to the detected signal that has passed through the filter circuit. Another determination circuit determines whether the second determination circuit determines whether or not there is a frequency signal having a frequency determined corresponding to the second control information.
The control information of is determined. In this preferable example, the level of the second frequency signal becomes higher than the level of the first frequency signal, and as a result of the suppression, the second frequency signal is obtained and transmitted by the determination output of another determination circuit. 2 control information can be specified. For this reason, the on-vehicle device only needs to add the second processing circuit, and a vehicle control device capable of performing two types of control can be obtained by reducing the change of the conventional equipment.

[0026]

1 is a block diagram showing a configuration of a ground device and a vehicle control device according to the present invention, FIG. 2 is a diagram showing an addition signal constituting a modulated wave, FIG. 3 is a diagram showing a modulated signal, and FIG. It is a figure which shows the level of the frequency signal obtained by demodulating a modulation signal.

The ground device A according to the present invention includes a track 1 and a transmitter 2. In the figure, reference numeral 4 is a vehicle.

The track 1 has a plurality of closed sections 0T, 1T, 2
It is divided into T ... Blocked section 0T, 1T, 2T
The closed boundaries of ... May be insulated or may not be insulated. Further, a resonance type track circuit may be formed by providing a resonator at the closed boundary, or a non-resonance type track circuit may be formed without providing a resonator.

The transmitter 2 is individually connected to one end side of the closed sections 0T, 1T, 2T, and has a carrier wave generation circuit 21 and a first circuit.
Modulated wave generation circuit 22 and second modulated wave generation circuit 23
And an adding circuit 24 and a modulating circuit 25. The carrier wave generation circuit 21 generates a carrier wave fc1. From the viewpoint of preventing mutual interference, it is desirable that the carrier wave fc1 be different between adjacent closed sections.

The first modulated wave generation circuit 22 generates a plurality of types of first frequency signals fm1 to fm7. The first frequency signals fm1 to fm7 are individually determined in frequency corresponding to a plurality of pieces of first control information. The first control information is, for example, presentation information of each closed section. As an example, when the in-vehicle signal display is 90 km / h, the frequency of the first frequency signal fm1 is 21 Hz and the in-vehicle signal display is 75 km.
In the case of / h, the frequency of the first frequency signal fm2 is 28H
If the in-vehicle signal display is 60 km / h in z, the frequency of the first frequency signal fm3 is 34 Hz, and the in-vehicle signal display is 0 km.
In the case of / h (01 present), the frequency of the first frequency signal fm7 is set to 73 Hz. First frequency signal fm1
The timing to generate fm7 is a command signal S1 from a central device (not shown) that performs vehicle operation management at the center.
Instructed by.

The second modulated wave generating circuit 23 generates a second frequency signal fm8. The second frequency signal fm8 is
The frequency is different from the frequencies of the first frequency signals fm1 to fm7, and is determined corresponding to at least one second control information, and the level V2 is the level of the first frequency signals fm1 to fm1.
It is set lower than the level V1 of fm7 (see FIG. 2). The second control information is, for example, announcement notice information of the front closed section. The announcement notice information indicates a case where the announcement of the front closed section changes to a lower announcement, and the like. Second
The timing of generating the frequency signal fm8 is designated by a command signal S1 from a central device (not shown) that performs vehicle operation management at the center.

The first frequency signals fm1 to fm7 and the second frequency signals
The frequency signal fm8 may be a sine wave, a square wave, or the like, but a sine wave is preferable from the viewpoint of reducing distortion in modulation, demodulation, and the like and reducing the influence of noise.

As shown in FIGS. 1 and 2, the adder circuit 24 outputs an added signal S4 obtained by adding any one of the first frequency signals fm1 to fm7 and the second frequency signal fm8. In the example of FIG. 2, an addition signal S4 obtained by adding the first frequency signal fm3 and the second frequency signal fm8 is output.
The addition signal S4 becomes a modulated wave of amplitude modulation.

As shown in FIGS. 1 and 3, the modulation circuit 25 supplies a modulation signal F1 obtained by amplitude-modulating the carrier wave fc1 with the addition signal S4 to one end of the closed sections 0T, 1T, 2T. In the embodiment, the modulated signal F1 is amplified by the amplifier 26 and supplied to the closed sections 0T, 1T, 2T.

As described above, the track 1 is divided into a plurality of closed sections 0T, 1T, 2T ... Transmitter 2
Are individually connected to one ends of the closed sections 0T, 1T, 2T, .... Therefore, it is possible to individually transmit a control signal for each block section and perform individual control.

The carrier wave generation circuit 21 generates a carrier wave fc1. The first modulated wave generation circuit 22 generates a plurality of types of first frequency signals fm1 to fm7, and the first frequency signals fm1 to fm7 are individually generated corresponding to the first control information having a plurality of frequencies. It is set. Second modulated wave generation circuit 2
3 generates a second frequency signal fm8, and the second frequency signal fm8 has a frequency of the first frequency signals fm1 to fm.
It is different from the frequency of 7 and is determined corresponding to at least one second control information. The adder circuit 24 is
The first frequency signals fm1 to fm7 and the second frequency signal f
An addition signal S4 obtained by adding m8 and m8 is output. Modulation circuit 2
Reference numeral 5 supplies the modulation signal F1 obtained by modulating the carrier wave fc1 with the addition signal S4 to one end of the closed sections 0T, 1T, 2T, .... Therefore, the first frequency signals fm1 to fm7
Of the second frequency signal fm8.
, For example, constitutes the announcement notice information. The control signal for each block section is the addition signal S of two waves of the presentation information and the announcement information.
It becomes a modulated signal by 4. Therefore, when the on-board device B receives the modulated signal F1 and detects it, the addition signal S4 of the display information and the display advance notice information is obtained. The presentation information and the announcement notice information can be individually identified. The on-board device B can display the in-vehicle traffic light 8 based on the display information, and can display the front notice based on the display notice information. As a result, a ground device capable of transmitting two types of control information with one carrier wave can be obtained.

Since the level V2 of the second frequency signal fm8 is set lower than the level V1 of the first frequency signals fm1 to fm7, they may be suppressed when the modulated signals F1 are received on the vehicle upper side. Therefore, the reception level of the first frequency signals fm1 to fm7 does not decrease. A specific description will be given with reference to FIG. The frequency of the first frequency signal fm3 is 34 Hz and the frequency of the second frequency signal fm8.
The frequency is 12 Hz. In FIG. 4, the horizontal axis represents the input level of the modulated signal, and the vertical axis represents the first level obtained by demodulation.
The output levels of the frequency signal and the second frequency signal are shown. The curve indicated by reference sign b indicates the reception level of the first frequency signal fm3 obtained from the modulated signal F1 by the addition signal S4 in which the levels of the first frequency signal fm3 and the second frequency signal fm8 are the same. is there. Reference code
a is the first frequency signal fm3 that has been conventionally used.
The first frequency signal fm obtained from the modulated signal by
The reception level of 3 is shown. The curve indicated by reference sign c shows the reception level of the first frequency signal fm3 obtained from the modulated signal F1 by the addition signal S4 in which the level of the second frequency signal fm8 is half the level of the first frequency signal fm3. It is shown. The curve indicated by reference numeral d similarly shows the reception level of the second frequency signal fm8. The level of the second frequency signal fm8 is set to the first frequency signal fm.
In the case of modulation with the same level as 3 (curve b),
Although the reception level of the frequency signal fm3 is about 4 dB lower than that in the case of the single wave modulation (curve a), the level of the second frequency signal fm8 is half the level of the first frequency signal fm3. In the case (curve c), the first frequency signal fm
The reception level of 3 is almost the same as in the case of single wave modulation (curve a). As a result, the on-board device B can receive the display information even in the conventional state.

In the embodiment, the frequency of the second frequency signal fm8 is set lower than the frequencies of the first frequency signals fm1 to fm7. In this preferable example, on the upper side of the vehicle, the low-pass filter makes it possible to distinguish the announcement information from the announcement information. In addition, distortion in modulation, demodulation, etc. is reduced and is less susceptible to noise.

The frequency of the second frequency signal fm8 can be set higher than the frequencies of the first frequency signals fm1 to fm7. In this preferred example, on the upper side of the vehicle, the high-pass filter makes it possible to distinguish the announcement information from the announcement information.

Further, in the embodiment, the second frequency signal fm8
Is set to be 6 to 10 dB lower than the levels of the first frequency signals fm1 to fm7. In this preferable example, when the on-board device B uses the amplitude limiting circuit and suppresses the detected signal, the first frequency signal fm1 having a large amplitude is generated.
fm7 suppresses the second frequency signal fm8 having a small amplitude, and the first frequency signals fm1 to fm7 are easily extracted. In addition, the first frequency signals fm1 to fm7 are attenuated more than the second frequency signal fm8, and a constant level can be ensured when the second frequency signal fm8 is extracted by suppression. The suppression is performed using an amplitude limiting circuit. Amplitude limiting circuits are commonly used and well known in the field of vehicle control.

Since the levels of the first frequency signals fm1 to fm7 and the level of the second frequency signal fm8 are associated with each other, they are attenuated in a fixed relationship in each closed section. Therefore, the reception level of both can be easily adjusted to a constant level in each block section.

Further, in the embodiment, the second modulated wave generating circuit 2
3 stores the presenting patterns of the adjacent closed sections 0T, 1T, 2T, ..., The vehicle detection signals S2 and S3 of the own closed section and the adjacent closed sections are input, and the vehicle detection signals S2 and S3 are input. Based on the change and the presenting pattern, the presenting change in the front closed section is predicted, and the second frequency signal fm8 is generated. In this preferred example, an appropriate advance notice is given in response to a change in state such as a preceding vehicle (not shown) has advanced through the closed section 2T in front of the vehicle, or a following vehicle 4 has approached a preceding vehicle (not shown) that is stopped. it can.

The vehicle control device according to the present invention includes a ground device A and an on-board device B, as shown in FIG. The ground device A is the one described above. The on-board device B receives the modulated signal F1 transmitted from the ground device A, demodulates the received modulated signal F1, and outputs the first frequency signals fm1 to fm.
m7 and the second frequency signal fm8 are decoded, and control is performed according to the first control information and the second control information. As a result, a vehicle control device that can perform two types of vehicle control with one carrier wave can be obtained.

FIG. 5 is a block diagram showing a specific structure of the on-vehicle device. The on-board device B includes a detection circuit 5, a first processing circuit 6, and a second processing circuit 7. The detection circuit 5 detects the received modulation signal F1 and detects the detection signal S5.
Is output. The detection circuit 5 may be shared by the first processing circuit 6 and the second processing circuit 7 as shown in the figure, or may be separately provided in the first processing circuit 6 and the second processing circuit 7. Good. In the embodiment, the receiving antenna 51 and the bandpass filter circuit 52 are further provided in the preceding stage of the detection circuit 5. In the bandpass filter circuit 52, the center selection frequency is set to the frequency of the carrier wave fc1.

The first processing circuit 6 is an amplitude limiting circuit 61.
And a plurality of determination circuits 621 to 627. The amplitude limiting circuit 61 suppresses the detected signal S5. The determination circuits 621 to 627 determine the first control information based on the presence / absence of the frequency signals fm1 to fm7 having the frequencies determined corresponding to the respective first control information. Judgment circuit 621
Is a bandpass filter, has a center selection frequency set to 21 Hz, and has passed the first frequency signal fm1.
If the first control information is “90
km / h ”. The presence or absence of the first frequency signal fm1 is
The first frequency signal fm1 is rectified and the output level is determined. The same applies to the determination circuits 622 to 626.

The second processing circuit 7 includes a filter circuit 71.
, Another amplitude limiting circuit 72, and another determination circuit 73. In the filter circuit 71, the frequency band to be passed is set to the frequency corresponding to the second control information.
The filter circuit 71 of the embodiment is composed of a low pass filter. Alternatively, a band pass filter or a high pass filter may be used depending on the frequency setting.
Another amplitude limiting circuit 72 suppresses the detected signal S5 that has passed through the filter circuit 71. Another determination circuit 73 determines the second control information based on the presence / absence of the frequency signal fm8 having the frequency determined corresponding to the second control information. Another determination circuit 73 is configured by a bandpass filter, the center selection frequency is set to 12 Hz, and when the second frequency signal fm8 that has passed is present, the second control information is “current front block interval present”. The display changes to a lower display. ” Second
Of the second frequency signal fm8
Is rectified and judged by its output level.

As described above, the detection circuit 5 detects the received modulation signal F1 and outputs the detection signal S5. Therefore, the addition signal S4 of the first frequency signals fm1 to fm7 and the second frequency signal fm8 is obtained as the detection signal S5.

The first processing circuit 6 includes an amplitude limiting circuit 61.
And a plurality of judging circuits 621 to 627, the amplitude limiting circuit 61 suppresses the detection signal S5, and the judging circuit 621
To 627 determine the first control information based on the presence / absence of the frequency signals fm1 to fm7 having the frequencies determined corresponding to the first control information. Therefore, the addition signal S4 of the first frequency signals fm1 to fm7 and the second frequency signal fm8 becomes the detection signal S5, but the suppression results in the first frequency signals fm1 to fm7 having the highest level. , First
It is possible to identify the first control information transmitted by the determination output of the determination circuit corresponding to the frequency signals fm1 to fm7. For example, when the first frequency signal fm1 is obtained from the determination circuit 621, it can be specified that “in-vehicle signal display is 90 km / h”. Moreover, since the reception levels of the first frequency signals fm1 to fm7 do not decrease, the same configuration as the conventional on-board device can be achieved.

The second processing circuit 7 includes a filter circuit 71.
, Another amplitude limiting circuit 72, and another determination circuit 73. In the filter circuit 71, the frequency band to be passed is set to the frequency corresponding to the second control information.
Another amplitude limiting circuit 72 suppresses the detected signal S5 that has passed through the filter circuit 71. Another determination circuit 73 determines the second control information based on the presence / absence of a frequency signal having a frequency determined corresponding to the second control information. Therefore, the level of the second frequency signal fm8 is the same as that of the first frequency signal fm.
The level becomes higher than the levels of 1 to fm7, and as a result of suppression, the second frequency signal fm8 is obtained, and the second control information transmitted by the determination output of another determination circuit 73 can be specified.

The on-board device B, which has received the announcement notice information as the second control information, can predict the announcement change of the front closed section 2T, and the vehicle 4 can move ahead of the front closed section 2T in advance. It is possible to perform control suitable for displaying the closed section 2T. For example, when the transmitter 2 is configured to transmit the announcement notice information when the front closed section 2T changes to the lower display, the on-board device B causes the vehicle 4 to close the front closed section 2T.
Before entering, it is possible to predict the indication of the front closed section 2T and perform brake control and the like in advance.

The second control information is converted into a plurality of frequency signals fm8.
To fm11, each frequency signal fm8 to f
Corresponding to m11, advance notice start, advance notice end, first rank lower indication (display one step lower than the indication of the relevant block section),
It is possible to transmit an announcement notice such as a second-ranking lower announcement (an announcement that is two steps lower than the announcement of the closed section). For this reason, notice start,
The accuracy of transmission of the notice is improved by a series of operations of the notice notice information (for example, the first rank lower notice) and the notice end, and appropriate control can be performed by the notice notice information.

The terrestrial device A is second to the conventional transmitter.
It is only necessary to add the modulated wave generating circuit 23 and the adding circuit 24 of. For this reason, it is possible to obtain a ground device capable of transmitting two types of control information with less modification of conventional equipment.

The on-board device B need only be provided with the second processing circuit 7. Therefore, it is possible to obtain a vehicle control device that can perform two types of control with a small change in conventional equipment.

[0054]

As described above, according to the present invention, the following effects can be obtained. (A) To provide a terrestrial device capable of transmitting two types of control information with one carrier wave. (B) To provide a vehicle control device capable of performing two types of vehicle control with one carrier wave. (C) It is an object of the present invention to provide a ground control device and a vehicle control device that can perform two types of control with a small change in conventional equipment.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a ground device and a vehicle control device according to the present invention.

FIG. 2 is a diagram showing an addition signal forming a modulated wave.

FIG. 3 is a diagram showing a modulated signal.

FIG. 4 is a diagram showing the level of a frequency signal obtained by demodulating a modulated signal.

FIG. 5 is a block diagram showing a specific configuration of an on-vehicle device.

[Explanation of symbols]

A ground equipment 1 orbit 0T-2T closed section 2 transmitter 4 vehicles B On-board equipment 5 Detection circuit 6 First processing circuit 61 Amplitude limiting circuit 621 to 627 determination circuit 7 Second processing circuit 71 Filter circuit 72 Another amplitude limiting circuit 73 Different judgment circuit fc1 carrier frequency F1 modulation signal fm1 to fm7 first frequency signal fm8 second frequency signal

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-8-20342 (JP, A) JP-A-58-185364 (JP, A) JP-A-56-10001 (JP, A) JP-A-56- 17759 (JP, A) JP-A-60-174356 (JP, A) Fukukaihei 4-52972 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B61L 3/08 B61L 23 / 16

Claims (10)

(57) [Claims] 1. A ground apparatus including a track and a plurality of transmitters, wherein the track is divided into a plurality of closed sections, and the transmitters are individually provided at one end side of each of the closed sections. And includes a carrier wave generation circuit, a first modulated wave generation circuit, a second modulated wave generation circuit, an addition circuit, and a modulation circuit, and the carrier wave generation circuit generates one carrier wave. The first modulated wave generation circuit generates a plurality of types of first frequency signals, and each of the first frequency signals corresponds to a plurality of first control information having a plurality of frequencies. It is individually defined, the second modulated wave generation circuit generates a second frequency signal, the second frequency signal, the frequency is different from the frequency of the first frequency signal, and, It is defined corresponding to at least one second control information, and Le is set lower than the level of said first frequency signal, said summing circuit outputs the first sum signal which is amplitude-modulated by adding the frequency signal and the second frequency signal The modulation circuit is a ground device for supplying a modulation signal, which is obtained by amplitude-modulating the carrier wave by the addition signal, to the one end. 2. The ground device according to claim 1, wherein the first control information is presentation information of each block section, and the second control information is presentation advance information of a front block section. 3. The ground device according to claim 1, wherein the frequency of the second frequency signal is set lower than the frequency of the first frequency signal. 4. The ground apparatus according to claim 1, wherein the frequency of the second frequency signal is set higher than the frequency of the first frequency signal. 5. The ground device according to claim 1, wherein the level of the second frequency signal is set to be 6 to 10 dB lower than the level of the first frequency signal. 6. The second modulated wave generation circuit stores a display pattern of adjacent closed sections, receives a vehicle detection signal of its own closed section and an adjacent closed section, and detects a change in the vehicle detection signal. The ground apparatus according to claim 2, wherein the second frequency signal is generated by predicting a change in the front closed section from the display pattern and generating the second frequency signal. 7. A vehicle control device including a ground device and an on-board device, wherein the ground device is any one of claims 1 to 6, wherein the on-board device is the ground device. Receiving the modulated signal transmitted from a device, demodulating the received modulated signal, decoding the first frequency signal and the second frequency signal, the first control information and the second control A vehicle control device that performs control according to information. 8. The on-vehicle device includes a first processing circuit, wherein the first processing circuit includes a detection circuit, an amplitude limiting circuit, and
A plurality of determination circuits, the detection circuit detects the modulated signal received and outputs a detection signal, the amplitude limiting circuit applies suppression to the detection signal, and each of the determination circuits includes the first determination circuit. The vehicle control device according to claim 7, wherein the first control information is determined based on the presence or absence of a frequency signal having a frequency determined corresponding to each of the control information. 9. The on-vehicle device includes a second processing circuit, and the second processing circuit includes another detection circuit, a filter circuit, another amplitude limiting circuit, and another determination circuit. And the another detection circuit detects the modulated signal received,
The detection circuit outputs a detection signal, the filter circuit has a pass frequency band set to a frequency corresponding to the second control information, and the another amplitude limiting circuit is the detection circuit that has passed through the filter circuit. 9. A signal for suppressing the signal, wherein the another determination circuit determines the second control information based on the presence / absence of a frequency signal having a frequency determined corresponding to the second control information. The vehicle control device described in 1. 10. The vehicle control device according to claim 9, wherein the detection circuit and the other detection circuit are the same.