JP3246947B2 - Communication device for train control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train control communication device, and more particularly to a train control communication device for detecting a train using a track circuit and providing information such as ATC to the train from the ground side. About.

[0002]

2. Description of the Related Art Conventionally, a train position detecting device using a track circuit uses a rail of a block section formed by dividing rails (tracks) at predetermined lengths as a part of a track circuit, and forms a block of the block section. A transmitter that transmits a signal of a predetermined frequency is connected to the start end (the side where the train enters), and a receiver that receives the signal is connected to the end side (the side where the train enters) of the block section. Have been.

[0003] In the above configuration, when a train is present in the block section and the rail is short-circuited by the axle (wheel) of the train, the output level of the receiver decreases, while no train exists in the block section. At that time, the output of the receiver is maintained at a predetermined height. Therefore, if the track relay is turned on and off by the output of the receiver, the presence or absence of the train in the block section can be detected in the on / off state.

[0004] The above-mentioned block section is electrically insulated from an adjacent block section by an impedance bond or the like with respect to an AC signal so as not to interfere with a train detection signal in the adjacent block section. It is devised. Also,
If the AC signal is formed so as to be electrically non-insulated, interference is prevented by making the frequencies of the detection signals used in adjacent block sections different from each other.

[0005] However, in the above-described conventional train detection device using a track circuit, the rails forming a part of the track circuit are in an environment that is susceptible to noise, so that the S / N ratio is likely to be low, and the rails adjacent to the rails are adjacent. There is a drawback that the circuit configuration is complicated because the carrier frequency is changed or a resonance circuit is provided at the boundary of the track in order to eliminate mutual interference with the track.

In order to solve the above-mentioned drawbacks, the present applicant spreads a train detection signal with a predetermined PN code to the starting end of a rail forming a track circuit as a train position detecting device having a high S / N ratio. Process and supply, receive the spread signal from the end of the rail, and
A train position detecting device has been proposed which is configured to detect a train detection signal by despreading with an N code and detect the presence or absence of a train on the rail based on a change in the detected signal.

[0007]

SUMMARY OF THE INVENTION According to the above proposal by the present applicant, a train position detecting device excellent in noise resistance can be realized. Since the proposed device has a feature of using a PN code, the present inventors use the feature to transmit train information such as ATC from the ground side (hereinafter, referred to as AT).
C information). Therefore, an object of the present invention is to provide a train control communication device capable of transmitting ATC information together with train detection.

[0008]

In order to achieve the above object, a train control communication device according to the present invention transmits a train detection signal to a starting point of a rail forming a track circuit by a predetermined PN ₁ signal.
The signal is spread and supplied with a code, the spread signal is received from the terminal side of the rail, and the PN ₁
In the same PN ₁ code and its PN ₁ code from PN ₁ code generator for generating code to despread processing configured to detect the train detection signal, on the rails by the change of the detected signal A train control communication device comprising a train detection means configured to detect the presence or absence of a train,
And PN ₂ code generator the PN ₁ code and type to generate a different PN ₂ codes, and the train control carrier wave so as to correspond to a predetermined train control signal amplitude, angle or modulator for phase modulation, the modulation Control signal supply means for spreading the signal modulated by the transmitter using the PN ₂ code and supplying the spread signal to the starting end of the rail, and on-board reception for receiving a signal from the rail via an antenna provided in the train means and its said received signal received by the onboard receiver and demodulation processing with the signal having the same frequency as the train control carrier PN ₂
First extracting means for extracting a code, and detecting means for detecting the PN ₂ codes from the extracted signal in extracted by the first extraction means, synchronized when the detecting means detects the PN ₂ codes and PN ₂ code generator for generating PN ₂ codes of the PN ₂ codes the same type by the received signal received by said onboard receiver by using the PN ₂ PN ₂ codes generated by the code generator Second extracting means for despreading and extracting the modulated signal, and a train control signal for demodulating the signal extracted by the second extracting means and outputting the predetermined train control signal Output means.

[0009]

[Action] In the above structure, the start end of the rail forming the track circuit, the signal for train control, which is modulated with a train detection is supplied are diffused respectively PN ₁ code and PN ₂ codes. Then, when there is no train in the rail, despread with the same PN ₁ code and its PN ₁ code from PN ₁ code generator for a signal received from the end side of the rail to generate a PN ₁ code Processing is performed to extract a train detection signal. The extracted signal indicates a level equal to or higher than a predetermined level and detects the absence of a train. On the other hand, when a train is present on that rail, the signal level at the end of the rail is low, the level of the extracted signal is low, and the presence of a train is detected. Furthermore, the signal received by the onboard receiver is demodulated processed by a signal having the same frequency as the train control carrier wave signal including PN ₂ codes are extracted. The detecting means detects the PN ₂ code from the extracted signal, and drives the PN ₂ code generator in synchronization with the detection time to generate the PN ₂ code. Thus, the second extraction means uses the PN ₂ codes the ground side and the synchronized PN ₂ codes the same type, to obtain a despread process the received signal modulated train control signal. The train control signal output means demodulates the modulated train control signal and outputs a train control signal.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a train control communication device according to an embodiment, and shows a block section (corresponding to a rail (track) of the present invention, and may be hereinafter referred to as a rail) T.
Are divided into block sections at predetermined intervals (in FIG. 1, only three block sections are shown around the block section T for simplification of the drawing) T, T ', T ". .
Each block section T, T ', T "may be a section using a well-known impedance bond, or may be a non-insulated section in which a capacitor or the like is interposed between rails.

Since the apparatus of this embodiment is installed for each block section, a train position detecting apparatus corresponding to the block section T will be described below. The modulation method of the train control signal is exemplified by the FSK method, which is a type of frequency modulation method.

[0012] First, the transmission unit b, the detection signal generator 1, PN ₁ code generator 2, FSK modulator 3, the train control signal generator 3 ', the train control carrier wave generator 4, PN ₂ codes A generator 5, first and second spreading circuits 6, 7, an adding circuit 8, and a transmitter 9 are provided. The detection signal generator 1 generates a train detection carrier (corresponding to the train detection signal of the present invention) (f _TD ) obtained by modulating a non-modulated or predetermined transmission signal into a normal AM, FM, or the like by a modulation circuit. It is configured to output. Also, a train control signal generator 3 '
Is configured to encode a parallel signal of ATC information, convert the signal into a serial signal, and generate the signal. The carrier wave for train detection (f _TD ) is output to the first spreading circuit 6, and the carrier wave for train control (f _ATC ) is transmitted to the train control signal by the FSK modulator 3 so as to correspond to predetermined ATC information. , And then output to the second spreading circuit 7.

The first spreading circuit 6 has a predetermined PN ₁ code (PN (θ _i )) (where θ _i represents a phase difference from the reference PN code (PN ₁ )), as shown in FIG. And this θ
By changing the value of _i , adjacent block sections T ',
After diffusion treatment train detection carrier (f _TD) using a PN ₁ code from PN ₁ code generator 2 for generating and.) That with a phase difference between the PN ₁ code used in T ", It is configured to output to the next addition circuit 8.
The second spreading circuit 7 spreads the output signal from the FSK modulator 3 using a predetermined PN ₂ code different from the PN ₁ code and outputs the signal to the next addition circuit 8. It is configured.

The transmitter 9 is formed of a known amplification circuit, and is configured to supply the output to the starting end S of the rail T.

Next, a receiver 10 is provided in the ground receiving unit b.
A terrestrial despreading circuit 11, a bandpass filter 12, and a detection unit 13 including a rectifier circuit and a detection circuit are provided. The receiver 10 is formed by a known amplification circuit, and outputs the output signal of the receiver 10 with the PN ₁ code (PN ₁ (θ _i )).
PN ₁ output from the PN ₁ code generator 2 for generating
Code (PN ₁ (θ _i)) and the same PN ₁ code (PN ₁ (theta
_i )) to output to the despreading circuit 11 for despreading processing. Therefore, the original train detection carrier wave (f _TD ) is output from the despreading circuit 11, and the track relay TR is lifted or dropped via the detection unit 13 depending on the presence or absence of this output.

The on-vehicle receiving unit c includes an on-vehicle receiver 20 for receiving a spread signal from the rail T via an antenna A provided on the train a, and a band-pass filter 21 for receiving the signal received by the receiver 20. And the carrier for train control (f
_ATC ) which outputs a signal having the same frequency as that of the _ATC ), which is divided by an output signal from a first signal generator 22, and which receives an output demodulated by the demodulator 23 via a low-pass filter 24 and , type PN ₂ codes (PN ₂₎ from PN ₂ code generator 25 for generating the PN ₂ code generator 5 and the same type of PN ₂ codes (PN _2), the matched filter 26 performing a correlation matching process , the synchronization holding circuit matched filter 26 outputs a drive signal in synchronization when it detects the same PN ₂ codes and PN ₂ codes 27
When a drive signal is input from the synchronization holding circuit 27,
And PN ₂ code generator 28 for generating the PN ₂ codes the same kind of PN ₂ codes (PN _2), inputs the output that is received by the onboard receiver 20 via the band-pass filter 21, the PN _An on-board despreading circuit 29 for despreading with a PN ₂ code (PN ₂ ) from a _two- code generator 28;
A signal despread by the onboard despreading circuit 29 is input via a band-pass filter 30 and demodulated, and an FSK demodulator 31 for outputting the train control signal and a train control signal are decoded. ATC decoding from serial signal to parallel signal
A control signal decoder 32 for outputting information is provided.

Next, the train detecting operation of the apparatus of this embodiment will be described. First, a case where the train a does not exist on the rail T will be described. The train detection carrier wave (f _TD ) transmitted from the detection signal generator 1 is spread by the first spreading circuit 6 using a PN ₁ code (PN ₁ (θ _i )).
Spread signal for train control of second spreading circuit 7 and adding circuit 8
And supplied to the starting end side S of the rail T via the transmitter 9.

At the end R of the rail T, there is a spread signal with attenuation due to the length of the rail T. Then, the spread signal is subjected to amplification processing in the receiver 10 and then a PN code (PN ₁ (θ _i )) from the PN ₁ code generator 2.
, And the original train detection carrier (f _TD ) is extracted.

By the above-described diffusion and despreading processing, for example, even if noise due to harmonics or noise transmitted from a train running on another track adjacent to the track T exists in the block section T, Due to the noise resistance characteristic of spread spectrum communication, these noises are effectively removed and only the original train detection carrier (f _TD ) is extracted. The extracted signal causes the track relay TR to be lifted by the detection unit 13 in the same manner as in a known train detection device.

On the other hand, if the train a exists in the block section T, the rail T is short-circuited by the axle W of the train a.
The level of the spread signal on the terminal side R is low, and therefore the output level of the receiver 10 is also low. Therefore, the detection unit 1
3 falls without being able to maintain the lifting of the track relay TR. The fall of the track relay TR makes it possible to know that the train a exists in the block section T.

Next, the transmission of ATC information from the ground side (transmitting unit a) to the vehicle (train a) will be described.
Receives the PN ₂ code (PN ₂ ) from the rail T via the antenna A. First, when the received signal is demodulated by the demodulation circuit 23 with a signal having the same frequency as the train control carrier (f _ATC ), PN ₂
A signal containing the code (PN ₂ ) is extracted. Next, the matching degree of the extracted signal with the PN ₂ code is detected by the matched filter 26. The matched filter 26 sends out a pulse-like detection signal to the synchronization holding circuit 27 every time the detection is performed, as shown in FIG. Synchronization holding circuit 27 PN from PN ₂ code generator 28 to each input of a detection signal
₂ code (PN ₂₎ and generate the same PN ₂ codes. That is, the PN ₂ code generator 28, PN ₂ codes are generated in synchronism with PN ₂ code generator 5 on the ground side. Further, even when a part of the detection signal is not output (see a chain line output of the matched filter in FIG. 2B), the PN ₂ code can be continuously generated by operating the internal timing circuit. Therefore, this PN ₂ code (P
When the received signal received by the onboard receiver 20 is despread by the onboard despreading circuit 29 using N ₂ ), a modulated train control signal is extracted. When this extracted signal is demodulated by the FSK demodulator 31, the original train control signal is obtained,
Further, when the signal is decoded by the control signal decoder 32, the parallel AT
C information is obtained. This ATC information is provided for controlling the train a. Since a large amount of data can be transmitted as a train control signal by a serial digital signal at the ground-side transmission unit A, a large amount of ATC information can be transmitted to the train a.

As described above, since the apparatus of this embodiment is a track circuit using a spread signal, the ATC information can be sent to the train a together with the train detection without separately providing an ATC communication facility. Further, since the transmitting and receiving units A and B are installed in the same equipment room, only _one PN ₁ code generator 2 is required, and the PN ₁ code is supplied to the spreading circuit 6 and the despreading circuit 11, respectively. Can be. In this case, connection can be made by wire, and synchronization processing can be performed extremely easily. Therefore, unlike a normal spread spectrum communication in which transmission / reception facilities are isolated, there is no need to provide a complicated synchronization circuit or the like at all, so that the structure can be made simple and inexpensive.

[0023]

The train control communication device according to the present invention has the structure described in claim 1 and can be easily configured. In particular, for the train detection part on the ground side,
Because it uses the spread spectrum communication using the same PN ₁ code that is generated from the same PN ₁ code generator,
It is possible to easily configure, it is highly train detection of noise immunity characteristics, also can conveniently the PN ₁ code phase of mutual interference prevention also used with adjacent track only by different, the
Moreover, the separation performance can be excellent. Furthermore, transfer of the ATC information onto car, because it uses the PN ₁ code and another type of PN ₂ codes, the train detection spread signal the same frequency band and is shared use, excellent separation properties In addition, since the ATC information uses the spread spectrum signal, the ATC information can have excellent noise resistance.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a phase difference of a spread signal with an adjacent track circuit, and an explanatory diagram showing an on-vehicle matched filter output and a generation timing of a PN ₂ code.

[Explanation of symbols]

1 sensing signal generator 2 PN ₁ code generator 5,25,28 PN ₂ code generator 3 FSK modulator 3 'train control signal generator 4 train control carrier wave generator 6 first, second Spreading circuit 11 Ground despreading circuit 20 Onboard receiver 22 Signal generator 23 Demodulator 26 Matched filter 31 FSK demodulator 32 Control signal decoder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-211162 (JP, A) JP-A-2-215243 (JP, A) JP-A-3-36830 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B61L 3/08 B61L 1/18 H04J 13/00

Claims (1)

(57) [Claims] 1. A supply and diffusion process the train detection signal with a predetermined PN ₁ code to the start end of the rail forming the track circuit, which receives the spread processed signal from the end side of the rail, PN ₁ to generate the PN ₁ code
And despreading processing at the same PN ₁ code and its PN ₁ code from the code generator and configured to detect the train detection signal, detects the presence or absence of a train on that rail by the change of the detected signal A PN ₂ code generator for generating a PN ₂ code different in type from the PN ₁ code, and a train control carrier for a predetermined train control. A modulator that performs amplitude, angle, or phase modulation processing in accordance with the signal; control signal supply means that performs spreading processing on the signal modulated by the modulator using the PN ₂ code and supplies the spread signal to the start end of the rail; On-vehicle receiving means for receiving a signal from the rail via an antenna provided on a train, and demodulating the received signal received by the on-vehicle receiving means using a signal having the same frequency as the train control carrier. Wherein said first extracting means for extracting a PN ₂ codes, from the first extraction signal in extracted by the extraction means P
Detecting means for detecting the N ₂ code, P to generate a PN ₂ codes of the PN ₂ codes the same kind in synchronization when said detecting means detects the PN ₂ codes
N ₂ code generator and the second to extract a signal the modulated despreading a reception signal received by said onboard receiver with PN ₂ codes generated in the PN ₂ code generator And a train control signal output means for demodulating the signal extracted by the second extractor and outputting the predetermined train control signal. apparatus.