JP3118069B2 - 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 communication device for controlling trains, and more particularly to a 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, in a train position detecting apparatus using a track circuit, a rail of a block section formed by dividing rails (tracks) at predetermined lengths is used as a part of the track circuit, and a starting end of the block section. A transmitter for transmitting a signal of a predetermined frequency is connected to the side (the side where the train enters), and a receiver for receiving the signal is connected to the terminal side (the side where the train enters) of the block section. ing.

[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 when no train exists in the block section. The output of the receiver is maintained at a predetermined height. Therefore, the orbit relay is turned on at the output of the receiver.
If N and OFF are set, the presence or absence of a train in the block section can be detected in the ON and OFF states.

[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 susceptible to noise.
There is a drawback that the N ratio tends to be low. In information transmission such as ATC for transmitting a speed limit signal or the like to a vehicle, the train detection signal is rectangular-wave modulated, received on the vehicle, and the modulation frequency is changed to discriminate information. If the train detection signal cannot be shared, another ATC frequency is provided and superimposed and transmitted to the track circuit. Therefore, as in the case of the train detection signal receiving circuit, it is susceptible to noise.
There is a disadvantage that the / N ratio tends to be low.

Accordingly, the present applicant has proposed a train position detecting device with high noise resistance which has solved the above-mentioned drawbacks.
The spread signal is supplied with the N code, the spread signal is received from the end of the rail, the PN code is extracted by demodulation with the train detection signal, and the PN code is extracted. We have proposed a spread-spectrum train position detector configured to detect a PN code with a matched filter. According to such a configuration, the presence of a train is detected when the PN code used in the transmission unit is detected on the reception side, and the presence of a train is detected when the PN code is not detected on the reception side. can do. Moreover, since the train detection is performed based on the degree of coincidence of the PN code, the noise resistance is improved in each stage.

[0007]

However, the spread spectrum type train position detecting device according to the above-mentioned proposal includes information such as ATC (hereinafter referred to as ATC) from the ground side to the vehicle (train).
There is no function of transmitting ATC information), and communication equipment must be provided separately for transmitting ATC information. By the way, since the proposed device uses a PN code, the present inventors have obtained knowledge of transmitting ATC information from the ground using the PN code. Therefore, the present invention
It is an object of the present invention 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 apparatus according to the present invention supplies a carrier to a starting end of a rail forming a track circuit by spreading the carrier with a predetermined PN code. Then, while receiving the spread signal from the terminal end of the rail, it is configured to be able to detect the predetermined PN code by performing demodulation processing using the carrier wave, and to detect the predetermined PN code by a change in the detected signal. In a train control communication device including train detection means configured to detect the presence or absence of a train on a rail, a PN code selection means for selecting a type of the predetermined PN code in correspondence with predetermined train control data; On-vehicle receiving means for receiving a signal from the rail via an antenna provided on the train, and a received signal received by the on-vehicle receiving means is a signal having the same frequency as the train detection signal. Extraction means for extracting a PN code by performing tone processing, and train control data extraction means for detecting the predetermined PN code from the extraction signal extracted by the extraction means and extracting the train control data. .

[0009]

In the above configuration, a carrier wave spread by a predetermined PN code is supplied to the starting end side of the rail forming the track circuit by the transmitting means. When a demodulation process is performed on the received signal received from the end of the rail using a carrier, a predetermined PN is obtained.
A signal containing the sign is extracted. When the predetermined PN code exists in the extracted signal, it is detected that there is no train. On the other hand, when a train is present on that rail, the signal level on the end side of the rail is low, and therefore the level of the extracted signal is small and the predetermined PN code is not detected. In this case, it is detected that a train is present. The PN code selecting means is a predetermined PN code.
The type of code is selected in accordance with predetermined train control data. The spread signal spread by the selected PN code is received by the on-board receiving means via an antenna provided on the train. The received signal is demodulated using a signal having the same frequency as the train detection signal to extract a PN code. Next, the train control data extracting means detects a predetermined PN code from the extracted signal and extracts the train control data.

[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 a track (corresponding to a rail of the present invention, sometimes referred to as a rail hereinafter) T is a block section (block) at predetermined intervals. In FIG. 1, for simplification of the drawing, only three block sections are shown around the block section T.)
T, T ', and T ". Each block section T,
T ', T "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 the rails.

Since the apparatus of this embodiment is installed for each block section, a train control communication apparatus corresponding to the block section T will be described below.

First, the signal generator 1 and A
A terrestrial PN code generator 2 controlled by a TC signal, respective spreading circuits 3 for performing spreading processing using a predetermined PN code generated therefrom, and a transmitter 4 are provided. Signal generator 1 is configured to output a carrier (f _c) having a predetermined frequency to the spreading circuit 3. In addition, ground P
The N code generator 2 has different types of PTCs corresponding to a plurality of (prepared 1 to n in the example of FIG. 1) predetermined ATC information prepared in advance.
It is configured to output N codes (PN ₁ (θ _i )) to (PN _n (θ _i )).

The spreading circuit 3 has a predetermined PN code, for example, A
PN code (PN ₁ (θ _i )) corresponding to TC information (1)
(Θ _i represents a phase difference from the reference PN code as shown in FIG. 2 so that a phase difference occurs between the PN codes used in adjacent block sections T ′ and T ″). After spreading the carrier (f _c ) using the PN code from the PN code generator 2, the rail T
Is supplied to the start side S of It should be noted that the transmitter 4 is composed of an amplifier.

The terrestrial receiving section b is provided with a receiver 10, a demodulation circuit 11 composed of a division circuit, a filter 12, and a train detection matched filter 13 composed of a correlation matching circuit. The receiver 10 is formed of a known Zohaba circuit and its output signal is configured to output to the demodulation circuit 11 demodulates the above signal generator 1 of the carrier (f _c). Therefore, the original PN code (PN ₁ (θ _i )) is extracted from the demodulation circuit 11. The matched filter 13 for train detection receives the PN code from the terrestrial PN code generator, inputs the output from the demodulator 11 via the filter 12, and when the two input signals match, the track relay It is configured to lift the TR.

Since the transmitting and receiving sections A and B are installed in the same equipment room, the signal generator 1 and the terrestrial PN code generator 3 are each single, and the carrier wave (f _c ), PN
The code (PN ₁ (θ _i )) can be supplied by wire to the diffusion circuit 3 and the matched filter 13 for train detection. Therefore, the synchronization is stable, the structure is simple, and it can be manufactured at low cost.

A receiver 20 for receiving a spread signal from the rail T via an antenna A provided on the train a and a signal received by the receiver 20 are input to the on-vehicle receiver C, and the signal generation is performed. A demodulator 22 that divides by an output signal from a signal generator 21 that outputs the same carrier wave (f _c ) as the demodulator 1, and a plurality of demodulators 22 that input the output demodulated by the demodulator 22 via a filter circuit 23 First to n-th matched filters MF
_{1 ~FM 2} and is provided. Then, these matched filter MF ₁ ~MF _n, previously transmitted portion each PN from the onboard PN code generator 24 that is configured to output a plurality of PN codes PN ₁ to PN _n where b side has It is configured so that each code can be input.

Next, the train detecting operation of the apparatus of this embodiment will be described. Now, the transmitting unit a sends the first train A
ATC information 1 is transmitted, and therefore, a PN code (PN ₁ (θ
_i )) is output. First, a case where the train a does not exist in the block section T first will be described. The carrier wave (f _c ) transmitted from the signal generator 1 is spread by a spreading circuit 3 using a PN code (PN ₁ (θ _i )), and supplied to the starting end S of the rail T via the transmitter 3. Is done.

At the terminal end R of the rail T, there is a spread signal attenuated due to the length of the rail T. The spread signal, after being Zohaba processed at the receiver 10, demodulated processed by a demodulator 11 with carrier waves (f _c) from the signal generator 1, the original PN code (PN ₁ (theta _i) ) Are extracted. And the matched filter 13 for train detection
Is the PN code (PN ₁ (θ
_i )), the PN code (P
₁ (θ _i )) is detected, and the track relay TR is lifted by the detection signal.

Due to the above diffusion and despreading processing, for example, noise caused by commercial power supply harmonics and noise transmitted from a train running on another track adjacent to track T exist in block section T. Also, due to the noise resistance characteristic of spectrum communication, these noises are effectively removed and the original PN code (PN ₁ (θ _i )) is extracted.
Since the train detection matched filter 13 is output only when the PN code (PN ₁ (θ _i )) matches, the noise resistance of the train detection is much better.

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. For this reason, the train detection matched filter 13 uses a PN code (PN ₁ (θ _i )).
Cannot be detected, and the track relay TR falls without being maintained. The fall of the track relay TR makes it possible to know that the train a exists in the block section T.

Next, transmission of ATC information from the ground side (transmitting unit a) to the vehicle (train a) will be described. In the receiver 20 provided in the train a, a PN code (P) corresponding to the first ATC information (1) is transmitted from the rail T via the antenna A.
N ₁ (θ _i )). When the received signal is demodulated using the carrier (f _c) by a demodulator 23, a signal is extracted that includes a PN code _{(PN 1 (θ i))} . The degree of coincidence of the extracted signal with the PN code (PN ₁ (θ _i )) is detected by the first matched filter MF ₁ , and an output signal corresponding to the first ATC information (1) is output.
The train a performs train control based on this output signal. The second
From the matched filter MF ₂ to matched filter MF _n of the n, since the degree of coincidence of the PN code is not detected,
It does not output ATC information. When a PN code (PN ₂ (θ _i )) corresponding to the second ATC information (2) is output from the terrestrial PN code generator ₂ , an output is obtained from the second matched filter MF2. The same applies to other ATC information (3) to (n).

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.

[0023]

According to the train position detecting device of the present invention, the carrier is spread and supplied with a predetermined PN code to the starting end of the rail forming the track circuit, and the spreading is performed from the end of the rail. A train configured to receive a signal and detect the predetermined PN code by performing demodulation processing using the carrier, and detect the presence or absence of a train on the rail based on a change in the detected signal. In the train control communication device provided with the detection means, the PN code selection means for selecting the type of the predetermined PN code in correspondence with the predetermined train control data, and from the rail via an antenna provided in the train On-vehicle receiving means for receiving a signal, and extracting means for extracting a PN code by demodulating a received signal received by the on-vehicle receiving means with a signal having the same frequency as the train detection signal, The train control data extracting means for detecting the predetermined PN code from the extracted signal extracted by the extracting means and extracting the train control data, so that a train position detecting device having high noise resistance can be provided. ATC information can be transmitted from the ground side to the train.

[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 of a PN code.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 signal generator 2 terrestrial PN code generator 10, 20 receiver 11, 22 demodulator 13 matched filter for train detection 24 on-vehicle PN code generator MF _{1 to} MF ₂ first to n-th matched filters

Continuation of front page (56) References JP-A-61-211162 (JP, A) JP-A-2-215243 (JP, A) JP-A-3-36830 (JP, A) JP-A-60-4340 (JP) , A) JP-A-59-2458 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61L 1/00-29/32

Claims (1)

(57) [Claims] A carrier is spread and supplied to a starting end of a rail forming a track circuit with a predetermined PN code, and the spread signal is received from an end of the rail, and the carrier is used. Demodulation processing and the predetermined PN
A train control communication device comprising a train detection means configured to detect a code and to detect the presence or absence of a train on the rail based on a change in the detected signal, wherein the type of the predetermined PN code is PN code selecting means for selecting a signal corresponding to predetermined train control data, on-vehicle receiving means for receiving a signal from the rail via an antenna provided in the train, Extracting means for demodulating the received signal with a signal having the same frequency as the train detection signal to extract a PN code; and extracting the predetermined P from the extracted signal extracted by the extracting means.
A train control data extracting means for detecting an N code and extracting the train control data; and a communication device for train control.