JP2004090871A - Track circuit transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a track circuit transmission device which performs higher density operation by superimposing the data to a spectrum modulated signal and transmitting it. <P>SOLUTION: The transmitting part and the receiving part in a ground apparatus room are connected to a track circuit to detect whether a train on the track circuit exists on the railroad line, and the signal from the transmitting part is received with an in-vehicle device installed in the train to control the train. The data of information code is superimposed on the same carrying frequency band range from the transmitting part. The receiving level after despread processing is monitored at the receiving control part in the ground apparatus room. Whether a train is on rail is determined depending on whether the receiving level falls below the predetermined value. The train is controlled based on the information code taken out by despread modulating the received signal at the in-vehicle control part of the in-vehicle device. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track circuit transmission device, and more particularly to a track control track circuit transmission device capable of detecting a train using a track circuit and transmitting information such as ATC to the train from the ground side.
[0002]
[Prior art]
FIG. 6 is a configuration diagram illustrating a conventional train detection control device disclosed in Patent Document 1, for example. The track (rail) is divided into closed sections T, T ', T "at predetermined intervals. Each closed section T, T', T" may be a section using a well-known impedance bond. A non-insulated section in which a capacitor or the like is interposed may be used. The transmitting section A and the ground receiving section B set in the closed section T are also installed in each of the closed sections T 'and T ". The transmitting section A has a detection signal generator 1 and an ATC signal generator 2 A first and a second spreading circuits 5, 6 for performing spreading processing with PN codes respectively generated from the first PN code generator 3 and the second PN code generator 4, an adding circuit 7, A transmitter 8 is provided.The detection signal generator 1 is a train detection carrier (train detection signal) obtained by modulating a predetermined transmission signal into a normal AM, FM, or the like by a non-modulation or modulation circuit. (F _TD ) Is output to the first spreading circuit 5. This case is shown in the case of no modulation. In addition, the ATC signal generator 2 changes the carrier frequency based on the ATC information, or modulates the AM frequency and the FM frequency using the ATC information to process the ATC carrier (train control signal) (f). _ATC ) Is output to the second diffusion circuit 6.
[0003]
The first spreading circuit 5 has a predetermined first PN code @ PN ₁ (Θ ₁ )｝ (Θ ₁ Is the reference PN ₁ Represents the phase difference from the sign, θ ₁ By changing the value, the train detection carrier (f) is generated using the PN code from the first PN code generator 3 that generates a phase different from that of the PN code used in the adjacent closed sections T 'and T ". _TD ), And outputs the result to the next addition circuit 7. Further, the second spreading circuit 6 generates a second PN code ｛PN different from the first PN code. ₂ (Θ _r )｝ (R = i + α, where i is the reference PN ₂ It represents the phase difference from the code, and is changed to the same phase as the first PN code by changing the i value. α is used for further expanding the ATC information. ), The train control carrier (f) _ATC ), And outputs the result to the next addition circuit 7. The transmitter 8 is formed of a well-known amplifier, and is configured to supply an output to the starting end side S (the side from which the train enters) S of the rail T.
[0004]
In the ground receiving unit b, a receiver 10, a despreading circuit 11, a band-pass filter 12, and a detecting unit 13 composed of a rectifying circuit and a detecting circuit are provided on the terminal side R (rail entrance side) of the rail T. Is provided. The receiving unit 10 is formed by a well-known amplifier circuit, and outputs an output signal of the receiving unit 10 using the first PN code ｛PN. ₁ (Θ ₁ ) It is configured to output to the despreading circuit 11 that performs the despreading process in｝. Accordingly, the despreading circuit 11 outputs the original train detection carrier (f _TD ) Is extracted. If a train exists in the section where the transmission / reception units i and b are installed, the track circuit is short-circuited by the axle W of the train, and the train detection carrier (f _TD ) Disappears, the train detection carrier (f _TD ), The detection unit 13 launches or drops the track relay TR. When the transmitting and receiving units A and B are installed in the same equipment room, only one first PN code generator 3 is required, and the PN code from the first PN code generator 3 is wired to the first spreading circuit 5 and the reverse. Each can be supplied to the diffusion circuit 11.
[0005]
The on-vehicle receiver C includes a receiver 20 for receiving a spread signal from the rail T via an antenna A provided on a train a having an axle W, and a band-pass filter for receiving one of the signals received by the receiver 20. 21 and the same train detection carrier (f) as the detection signal generator 1. _TD ), And a demodulator 23 that divides by an output signal from the signal generator 22, and an output demodulated by the demodulator 23 is input through a filter circuit 24, and the first PN code generator PN code (PN ₁ ) To generate a PN code (PN) from the third PN code generator 25. ₁ ) Is input to perform a correlation matching process, and the matched filter 26 includes a first PN code ｛PN ₁ (Θ ₁ )}, The second PN code (PN ₂ ), The other of the signals received by the receiver 20 is input via a band-pass filter 28, and the fourth PN code generator 27 generates the PN code having the same phase as that of the fourth PN code generator 27. A despreading process is performed on the output and the train control carrier (f _ATC ) And the output of the despreading circuit 29 is converted into a train control carrier (f) by a well-known frequency analysis circuit. _ATC And an FFT analyzer 30 that accurately extracts and outputs only the FFT analyzer 30).
[0006]
[Patent Document 1]
JP-A-5-254435
[0007]
[Problems to be solved by the invention]
In the above-mentioned conventional train detection control device, since a phase delay value is used as information, only a limited amount of information can be obtained, which is not suitable for higher-density operation.
For example, to transmit a section where a train should be stopped, it is necessary to transmit current position section information and a relative position of the section to be stopped from the current section, which requires a large amount of information. In addition, in order to obtain one piece of information, a carrier (f _TD ), The carrier wave for train control (f _ATC ) It is necessary to use the signal of ②, and the frequency use efficiency is poor.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a track circuit transmission device capable of performing higher-density operation by mounting data on a spectrum-modulated signal and transmitting the data. Aim.
[0009]
[Means for Solving the Problems]
A track circuit transmission device according to the present invention connects a transmission unit and a reception unit of a ground equipment room to a track circuit, detects the presence or absence of a train on the track circuit, and uses the on-board device mounted on the train to perform the above-described operation. In a track circuit transmission device that receives a signal from a transmission unit and controls a train, a transmission control unit that generates an information code to be transmitted, and an SS signal modulation unit that modulates data of the information code to be transmitted by spread spectrum. A transmitting unit of a terrestrial equipment room including: an output unit configured to output a signal from the SS signal modulating unit; a band-pass filter and an amplifier; and a first matching transformer transmitting the signal of the output unit. A second matching transformer on the track circuit side for receiving a signal from the transmitting unit and transmitting the signal from the track circuit; a third matching transformer on the track circuit side for transmitting a signal from the track circuit; A fourth matching transformer for receiving a signal from the coupling transformer, an input unit including an amplifier and a band-pass filter for receiving and amplifying the signal from the fourth matching transformer, and a signal from the input unit. An SS signal demodulation unit for demodulating by spectrum despreading, a reception unit of a ground equipment room having a reception control unit for performing control using a signal from the SS signal demodulation unit, and a power receiving device for receiving a signal from the track circuit. A fifth matching transformer for transmitting a signal from the power receiving unit, an input unit including an amplifier and a band-pass filter for receiving and amplifying the signal of the fifth matching transformer, and a signal from the input unit. An on-board device having an SS signal demodulation unit for demodulating the signal by spectrum despreading, and an on-board control unit for controlling a train using the information code extracted from the SS signal demodulation unit. The reception control unit in the room monitors the reception level after despreading, determines whether the train is on-rail or off-rail by determining whether the reception level falls below a predetermined value, and controls the on-board device of the on-board device. In the section, the train is controlled by an information code extracted by despreading the received signal.
[0010]
The SS signal modulator of the transmitter in the ground equipment room includes a DSP (Digital Signal Processor) and a D / A (Digital / Analog) converter, and generates a signal subjected to spectrum modulation from a data stream. The SS signal demodulation unit of the reception unit in the ground equipment room is constituted by an A / D (analog-digital) converter and a DSP, performs despreading of a spectrum from an input signal, extracts an original signal, and obtains an on-board device. The SS signal demodulation unit includes an A / D converter and a DSP, and performs despreading of a spectrum from an input signal to extract an original information code.
[0011]
In addition, a signal based on the same information code generated by the transmission control unit in the ground equipment room is extracted from the SS signal demodulation unit in the ground equipment room, and is used as on-rail detection in the reception control unit. The train signal is extracted from the SS signal demodulation unit and the train control is performed by the on-board control unit.
In addition, for each closed section of the track circuit, the transmitting section and the receiving section of the ground equipment room are provided, respectively, and a plurality of bands having different frequency bands of spread spectrum are provided, and the closed section of the adjacent closed section of the track circuit is provided. The transmission section is assigned with a different frequency band.
[0012]
Further, the transmitting section of the ground equipment room multiplexes and transmits the data of the information code which has been spectrum-spread with different PN codes (pseudo-noise codes).
Furthermore, in the above-mentioned on-board device, demodulation is performed by spectrum despreading with different PN codes (pseudo-noise codes), and among the extracted information code signals, the signal having the highest reception level is selected. .
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a track circuit transmission device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 31 denotes a transmission control unit of a carrier for generating an information code to be transmitted, 32 denotes an SS signal modulation unit for modulating data of the information code to be transmitted by spread spectrum, and 33 denotes a band pass for outputting a signal. An output unit 34 composed of a filter and an amplifier is a matching transformer on the ground equipment room 100 side, and the transmission control unit 31 to the matching transformer 34 constitute a transmission unit on the ground equipment room 100 side.
[0014]
35 is a matching transformer on the track circuit 200 side, 200 is a track circuit, and 36 is a matching transformer on the track circuit 200 side. 37 is a matching transformer on the ground equipment room 100 side, 38 is an input unit composed of an amplifier and a bandpass filter for receiving and amplifying a signal, 39 is an SS signal demodulation unit for demodulating received data by spectrum despreading, Reference numeral 40 denotes a reception control unit that performs control using the received information code and reception level. The matching transformer 37 to the reception control unit 40 constitute a reception unit on the ground equipment room 100 side.
[0015]
The track circuit 200 (rail) is divided into closed sections i + 1, i + 2,... (Shown in FIG. 3) at predetermined intervals. Each closed section may be a section using a known impedance bond, or may be a non-insulated section in which a capacitor or the like is interposed between rails. The ground equipment room 100 is configured by the transmission control unit 31 to the matching transformer 34 as the transmission unit and the matching transformer 37 to the reception control unit 40 as the reception unit. The ground equipment room 100 is provided for each closed section i + 1, i + 2,... Of the track circuit 200 together with the matching transformers 35 and 36 on the track circuit 200 side. In each closed section, for example, the transmission unit of the ground equipment room 100 is connected to the train entry end side of the closed section, and the reception unit is connected to the train entry end side of the closed section.
[0016]
41 is a power receiver which is an antenna on the on-board device 300 for receiving a signal from the track circuit 200, 42 is a matching transformer on the on-board device 300, 43 is an amplifier and a band pass filter for receiving and amplifying the signal. The configured input unit, 44 is an SS signal demodulation unit that demodulates received data by spectrum despreading, and 45 is an onboard control unit that performs onboard control using the received information code. The power receiver 41 to the on-vehicle control unit 45 constitute the on-vehicle device 300.
[0017]
Here, the information code transmitted from the transmission control unit 31 includes the current block section number to be transmitted (block section number where the ground equipment room 100 exists) and the block section number at which the train on the track circuit should stop. Contains identifiable data. The on-board controller 45 of the on-board device 300 receiving these data performs train control based on these data. On the other hand, the reception control unit 40 of the ground equipment room 100 monitors the message and the reception level after despreading. If the train is present in the section, the track circuit is short-circuited by the axle of the train, so that the signal does not reach the receiving end of the ground equipment room 100 in the section. As a result, the message cannot be received by the reception control unit 40, and the reception level decreases to a predetermined value or less. Thereby, the presence / absence of the train in the section can be determined.
[0018]
On the other hand, when the on-board device 300 receives the signal, the on-board controller 45 can despread the signal and transmit the transmitted information code. The on-board controller 45 sets a target stop point from the current block section number (block section number where the ground equipment room 100 exists) included in the received data and the block section number at which the train should stop, and An on-board brake pattern that can be stopped at a target stop point in the section is generated. When the train exceeds the on-vehicle brake pattern, control is performed to operate the brake. The identification of the received signal from the ground equipment room 100 installed in the currently closed section where the train exists and the ground equipment room 100 installed in the adjacent closed section is determined by the strength of the received signal, or the The determination is made based on the difference in the used frequency band for each section, or both. Further, the received information code may include, for example, a current block section number of the train and a speed limit at the designated block section number of the train.
[0019]
FIG. 2 is a configuration diagram showing an SS signal modulation unit and an SS signal demodulation unit on the ground and in the vehicle of the track circuit transmission device according to the first embodiment. Here, the SS signal modulation unit 32 can directly generate a spectrum-modulated signal from a data sequence using a DSP (digital signal processor) 51 and a D / A (digital-analog) converter 52. By using the DSP, the SS signal modulation section, which has conventionally been composed of a large number of individual components, can be composed of a small number of components, and the reliability of the device can be improved. In addition, since signal generation is performed by high-precision calculation, signal degradation due to distortion or the like is suppressed as compared with an individual circuit. Further, according to the DSP calculation, unnecessary signals such as side bands other than the main signal can be removed in advance by the calculation.
[0020]
Further, the SS signal demodulation unit 39 can despread the spectrum from the input signal by using the A / D (analog-digital) converter 53 and the DSP (digital signal processor) 54 to extract the original information code. . Further, the value of the signal level after despreading can be obtained. Further, the SS signal demodulation unit 44 can also use the A / D converter 55 and the DSP 56 to perform despreading of the spectrum from the input signal and extract the original information code. Further, the value of the signal level after despreading can be obtained.
[0021]
According to the track circuit transmission device shown in FIG. 1, the same information code generated by the transmission control unit 31 and its signal level are used by the reception control unit 40 of the ground equipment room 100 as the on-rail detection function, and the on-board device 300 is used. Can be used as on-vehicle control data. That is, a signal from one transmission unit (31 to 34) can be shared as a signal for detecting the presence of a track on the ground and a signal for controlling a train on a vehicle. As a result, signals that have conventionally generated and received the on-rail detection signal and the on-vehicle train control signal, respectively, can be realized by the common ground / vehicle transmission units (31 to 34). The system configuration can be simplified.
[0022]
The on-vehicle control unit 45 of the on-vehicle device 300 receives, for example, signals from a plurality of closed sections of the track circuit at the same time, and legitimately receives a signal having a maximum reception level after despreading of the SS signal demodulation. Select as signal. In the case of the non-insulated track circuit, in addition to the signal in the existing section, the signal in the forward section is also received across the section boundary. The on-vehicle control unit 45 has a function of receiving all the signals that may be received, and simultaneously operates this function. The SS signal demodulation unit 44 demodulates all the received signals. As a result of the demodulation, the reception levels of all the received signals are obtained. The reception levels are compared, and the signal having the maximum level is a signal in the existing section, and this is selected as a normal reception signal at that time. Thus, when passing through the boundary of the closed section, since the signal of the front section is received in advance, the signal of the next closed section can be switched as a normal signal at the same time as the closed section is switched.
[0023]
Embodiment 2 FIG.
FIG. 3 is an explanatory diagram showing the allocation of the used frequency band for each closed section of the track circuit in the track circuit transmission apparatus according to the second embodiment. FIG. 4 is an explanatory diagram showing a used frequency band in the track circuit transmission device according to the second embodiment. A method will be described in which a carrier frequency band is distinguished for each adjacent block section and is repeated every plural block sections. As a result, it is possible to effectively remove the interfering signal from the adjacent closed section of the track circuit.
[0024]
As shown in FIG. 4, the frequency band f0 is used in the specific block section i + 1, the frequency band f1 is used in the adjacent block section i + 2, and the frequency band f2 is used in the adjacent block section i + 3. This is further repeated for the three closed sections, and three waves are sequentially allocated. Since the receiving side knows the frequency band of the blockage section of the received signal, it can select and receive only the signal band using a filter or the like. Thereby, even in the non-insulated track circuit, the influence from the adjacent closed section can be easily removed. The frequency band to be used is determined by the band of the SS signal modulator / demodulator and the allowable use band of the track circuit. In FIG. 3, three waves are arranged and used repeatedly so that the used frequency bands are adjacent to each other in ascending order. Here, an example of three waves is shown, but it goes without saying that two or four or more waves can be used.
[0025]
Embodiment 3 FIG.
FIG. 5 is a configuration diagram for multiplexing information codes in the track circuit transmission apparatus according to the third embodiment. Data that has been spread with different PN codes (pseudo-noise codes) is multiplexed and transmitted. On the receiving side, despreading is performed using the different PN codes. As a result, the original two series of data strings can be obtained. In FIG. 5, one of the first information codes is spread by a first PN code generator 61 in an adder 62, and further modulated by a modulator 64 by a signal from an oscillator 63. The other second information code is spread by an adder 67 by a second PN code generator 66 different from the above, and is modulated by a modulator 69 by a signal from an oscillator 68. These two waves are combined by the combiner 70 and output to the output unit 33. Note that the oscillator 63 and the oscillator 68 may be the same. On the receiving side, the spectrum is despread with the first and second PN codes, respectively, and demodulated. As a result, more information can be transmitted by multiplexing while using the same frequency band.
[0026]
Embodiment 4 FIG.
The transmitter in the ground equipment room transmits data that has the same carrier frequency band but is spread spectrum with a different PN code for each closed section of the track circuit. The on-board controller 45 of the on-board device 300 simultaneously receives signals from a plurality of closed sections of the track circuit, performs despreading of the SS signal demodulation with a plurality of assumed PN codes, and extracts the extracted information code. , The signal having the highest reception level is selected as a valid reception signal. In the case of the non-insulated track circuit, in addition to the signal in the existing section, the signal in the preceding section is also received across the section boundary. The on-vehicle control unit 45 has a function of receiving all the signals that may be received, and simultaneously operates this function. The SS signal demodulation unit 44 demodulates all the received signals. As a result of the demodulation, reception levels of all the received signals are obtained. The reception levels are compared, and the signal having the maximum level is the signal of the existing section, and this is selected as the normal reception signal at that time. Thus, when passing through the boundary of the closed section, since the signal of the front section is received in advance, the signal of the next closed section can be switched as a normal signal at the same time as the closed section is switched.
[0027]
【The invention's effect】
As described above, according to the track circuit transmission device of the present invention, the transmission unit and the reception unit of the ground equipment room are connected to the track circuit to detect the presence or absence of the train on the track circuit, In a track circuit transmission device that receives a signal from the transmission unit and controls a train with an on-board device, a transmission control unit that generates an information code to be transmitted, and spreads spectrum data of the information code to be transmitted. Signal modulating section, an output section including a band-pass filter and an amplifier for outputting a signal from the SS signal modulating section, and a first matching transformer transmitting the signal of the output section. A transmission section of the equipment room, a second matching transformer on the track circuit side for receiving a signal from the transmission section and transmitting the signal to the track circuit, and a third matching transformer on the track circuit side for transmitting a signal from the track circuit; A fourth matching transformer receiving a signal from the third matching transformer on the track circuit side of the above, an input unit comprising an amplifier for receiving and amplifying a signal from the fourth matching transformer, and a band-pass filter; An SS signal demodulation unit that demodulates a signal from the input unit by spectrum despreading, and a reception unit of a ground equipment room having a reception control unit that performs control using a signal from the SS signal demodulation unit, , A fifth matching transformer for transmitting a signal from the power receiving unit, and an input unit including an amplifier and a band-pass filter for receiving and amplifying the signal of the fifth matching transformer. An on-board unit having an SS signal demodulation unit for demodulating a signal from the input unit by spectrum despreading, and an on-board control unit for controlling a train using an information code extracted from the SS signal demodulation unit. The reception control unit of the ground equipment room monitors the reception level after despreading, and determines whether the train is on-rail / off-rail by determining whether the reception level falls below a predetermined value. The on-board control unit of the upper device controls the train with the information code extracted by despreading the received signal, so the data is loaded on the spectrum-modulated signal and transmitted, so that higher density operation can be performed. Can be performed.
[0028]
The SS signal modulator of the transmitter in the ground equipment room includes a DSP (Digital Signal Processor) and a D / A (Digital / Analog) converter, and generates a signal subjected to spectrum modulation from a data stream. The SS signal demodulation unit of the reception unit in the ground equipment room is constituted by an A / D (analog-digital) converter and a DSP, performs despreading of a spectrum from an input signal, extracts an original signal, and obtains an on-board device. The SS signal demodulation unit is composed of an A / D converter and a DSP, and performs despreading of a spectrum from an input signal to take out an original information code. , The SS signal modulating section can be constituted by a small number of components, and the reliability of the device can be improved. In addition, since signal generation is performed by high-precision calculation, signal degradation due to distortion or the like is suppressed as compared with an individual circuit.
[0029]
In addition, a signal based on the same information code generated by the transmission control unit in the ground equipment room is extracted from the SS signal demodulation unit in the ground equipment room, and is used as on-rail detection in the reception control unit. Since the train is controlled by the above-mentioned on-board control section by taking out from the SS signal demodulation section, it can be transmitted to the above-mentioned reception control section and the on-board control section in one carrier frequency band. Efficient.
In addition, for each closed section of the track circuit, the transmitting section and the receiving section of the ground equipment room are provided, respectively, and a plurality of bands having different frequency bands of spread spectrum are provided, and the closed section of the adjacent closed section of the track circuit is provided. Since different frequency bands are assigned to the transmission units, it is possible to effectively remove interference signals from adjacent closed sections of the track circuit.
[0030]
In addition, in the transmission unit in the terrestrial equipment room, the data of the information code that has been spectrum-spread with different PN codes (pseudo-noise codes) is multiplexed and transmitted. Information can be transmitted.
Furthermore, in the above-mentioned on-board device, different PN codes (pseudo-noise codes) are used for demodulation by spectrum despreading, and a signal having the highest reception level is selected from the extracted information code signals. When passing through the boundary of the section, since the signal of the front section is received in advance, the signal of the next block section can be switched as a normal signal at the same time as the block section is switched.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a track circuit transmission device according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram illustrating an SS signal modulation unit and an SS signal demodulation unit on the ground and in the vehicle of the track circuit transmission device according to the first embodiment;
FIG. 3 is an explanatory diagram showing allocation of a used frequency band for each closed section of a track circuit in the track circuit transmission apparatus according to the second embodiment.
FIG. 4 is an explanatory diagram illustrating a frequency band used in the track circuit transmission device according to the second embodiment.
FIG. 5 is a configuration diagram for performing multiplexing of an information code in the track circuit transmission apparatus according to the third embodiment.
FIG. 6 is a configuration diagram showing a conventional train detection control device.
[Explanation of symbols]
31 transmission control unit 32 SS signal modulation unit
33 Output unit 34 Matching transformer
35 Matching transformer 36 Matching transformer
37 Matching transformer 38 Input section
39 SS signal demodulation unit 40 Reception control unit
41 Power receiver 42 Matching transformer
43 input unit 44 SS signal demodulation unit
45 On-board controller 51 DSP
52 D / A converter 53 A / D converter
54 DSP 55 A / D converter
56 DSP 61 1st PN code generator
62 adder 63 oscillator
64 modulator 66 second PN code generator
67 Adder 68 Oscillator
69 modulator 70 synthesizer
100 Ground equipment room 200 Track circuit
300 Onboard equipment.

Claims (6)

The transmission and reception units of the ground equipment room are connected to the track circuit to detect the presence or absence of the train on the track circuit, and the on-board equipment mounted on the train receives the signal from the transmission unit and trains the train. In the track circuit transmission device that controls
A transmission control unit that generates an information code to be transmitted, an SS signal modulation unit that modulates the data of the information code to be transmitted by spread spectrum, and a bandpass filter and an amplifier that output a signal from the SS signal modulation unit. A transmitting unit of a ground equipment room having an output unit configured and a first matching transformer for transmitting a signal of the output unit;
A track matching circuit-side second matching transformer that receives a signal from the transmission unit and transmits the signal to the track circuit, and a track circuit-side third matching transformer that transmits a signal from the track circuit;
A fourth matching transformer receiving a signal from the third matching transformer on the track circuit side, an input unit including an amplifier for receiving and amplifying a signal from the fourth matching transformer and a band-pass filter; An SS signal demodulation unit that demodulates a signal from the input unit by spectrum despreading, and a reception unit of a ground equipment room having a reception control unit that performs control using a signal from the SS signal demodulation unit;
A power receiver for receiving a signal from the track circuit, a fifth matching transformer for transmitting a signal from the power receiving unit, an amplifier for receiving and amplifying a signal of the fifth matching transformer, and a band-pass filter. A car having an input section, an SS signal demodulation section for demodulating a signal from the input section by spectrum despreading, and an on-board control section for controlling a train using an information code extracted from the SS signal demodulation section. Equipped with the upper device,
The reception control unit in the ground equipment room monitors the reception level after despreading, and determines whether the train is on-rail / off-rail by determining whether the reception level falls below a predetermined value,
A track circuit transmission device in which the on-board control unit of the on-board device controls a train by an information code extracted by despreading a received signal. The SS signal modulator of the transmitter in the ground equipment room includes a DSP (Digital Signal Processor) and a D / A (Digital / Analog) converter, and generates a signal subjected to spectrum modulation from a data stream.
The SS signal demodulation unit of the reception unit in the ground equipment room is constituted by an A / D (analog-digital) converter and a DSP, performs despreading of a spectrum from an input signal, and extracts an original signal.
2. The track circuit transmission device according to claim 1, wherein the SS signal demodulation unit of the on-board device includes an A / D converter and a DSP, and despreads a spectrum from an input signal to extract an original information code. . A signal based on the same information code generated by the transmission control unit in the ground equipment room is extracted from the SS signal demodulation unit in the ground equipment room, and is used by the reception control unit as on-rail detection, and the SS signal of the onboard control unit is used. The track circuit transmission device according to claim 1 or 2, wherein the train control is performed by taking out from the demodulation unit and controlling the train in the on-board control unit. For each closed section of the track circuit, the transmitting section and the receiving section of the ground equipment room are respectively provided, and a plurality of units having different frequency bands of spread spectrum are provided, and the transmitting section of the closed section adjacent to the track circuit is provided. The orbit circuit transmission device according to any one of claims 1 to 3, wherein the frequency band is assigned to a different frequency band. 2. The track circuit transmission device according to claim 1, wherein the transmission unit in the ground equipment room multiplexes and transmits the data of the information code which has been spectrum-spread with different PN codes (pseudo-noise codes). 2. The track according to claim 1, wherein the on-vehicle device demodulates each of the different PN codes (pseudo-noise codes) by spectrum despreading, and selects a signal having the highest reception level among the extracted information code signals. Circuit transmission equipment.

Images