JPH05254434A - Communication device for train control - Google Patents

Abstract

PURPOSE:To make a communication device for train control capable of performing transmission aboard a train of ATC information having a good noise-proof characteristic by conducting train detection by means of a track circuit in a spectrum spread communication method. CONSTITUTION:In a communication device for train control that spreads and processes a carrier wave with a specified PN code and supplies to the side (S) of the starting end of a rail (T) forming a track circuit, and receives it at the side (R) of the terminal end and demodulates and processes it to detect the PN code, and possesses means that detect the presence of a train (a) on the rail (T) with the change of a detected signal, the means are composed of a PN code selecting means that selects the kind of the PN code in response to a specified data for train control, a receiving means 20 aboard a train that receives signals from the rail through an antenna (A) provided on the train, an extracting means that demodulates and processes the received signal to extract the PN code, and a train control data extracting means that used the extracted signal.

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 circuit capable of detecting a train by using a track circuit and providing information such as ATC to the train from the ground side. Regarding

[0002]

2. Description of the Related Art Conventionally, a train position detecting device using a track circuit has a rail of a block section formed by dividing a rail (track) into predetermined lengths as a part of the track circuit, and a start end of the block section. It is configured by connecting a transmitter that sends out a signal of a predetermined frequency to the side (the side where the train advances) and a receiver that receives the signal at the end side of the closed section (the side where the train enters). ing.

In the above construction, when there is a train in the closed section and the rail is short-circuited by the axle (wheel) of the train, the output level of the receiver decreases, while when there is no train in the closed section. The output of the receiver is maintained at a predetermined height. Therefore, the orbit relay is turned on by the output of the receiver.
If it is turned off N, it is possible to detect the presence / absence of a train in the closed section in the ON / OFF state.

The block sections are electrically isolated from the AC signals by impedance bonds with the adjacent block sections so that they do not interfere with the train detection signals of the adjacent block sections. It is devised. Also,
In the case of being electrically non-insulated with respect to the AC signal, the frequencies of the detection signals used in the adjacent block sections are made different from each other to prevent interference.

However, in the above-described conventional train detecting device using a track circuit, since the rail forming a part of the track circuit is in an environment susceptible to noise, S /
There is a drawback that the N ratio tends to be low. Further, in the information transmission such as ATC for transmitting a speed limit signal and the like on the vehicle, the train detection signal is rectangular wave modulated, received on the vehicle, and the modulation frequency is changed to distinguish the information. When the train detection signal cannot be shared, another ATC frequency is provided, superimposed and transmitted to the track circuit. Therefore, like the train detection signal receiving circuit, it is susceptible to noise and S
There is a drawback that the / N ratio tends to be low.

Therefore, the applicant of the present invention, as a train position detecting device having high noise resistance to solve the above-mentioned drawbacks, sends a train detecting signal to a predetermined P on the starting end side of a rail forming a track circuit.
The N-code is supplied after being spread, the spread-processed signal is received from the end side of the rail, and the train detection signal is demodulated to extract the PN code, which is provided with a correlation matching circuit. We proposed a spread-spectrum train position detection device configured to detect PN codes with a matched filter. According to such a configuration, when the PN code used in the transmitter is detected by the receiver, the absence of train is detected, and when the PN code is not detected by the receiver, the presence of train is detected. can do. Moreover, since the train detection is performed by the degree of coincidence of the PN code, the noise resistance characteristic is improved in each step.

[0007]

However, in the spread spectrum train position detection device according to the above proposal, information such as ATC from the ground side to the train (train) (hereinafter,
There is no function for sending ATC information), and it was necessary to separately provide communication equipment for transmitting ATC information. By the way, since the proposed apparatus uses a PN code, the inventors have found that the PN code is used to send ATC information from the ground side. Therefore, the present invention is
An object of the present invention is to provide a train control communication device capable of transmitting ATC information as well as train detection.

[0008]

In order to achieve the above-mentioned object, a train control communication device according to the present invention supplies a carrier wave to a starting end side of a rail forming a track circuit by spreading with a predetermined PN code. Then, the spread signal is received from the terminal side of the rail, and the carrier wave is demodulated to detect the predetermined PN code. In a train control communication device including train detection means for detecting the presence or absence of a train on a rail, PN code selection means for selecting the type of the predetermined PN code in association with predetermined train control data. , An on-board receiving means for receiving a signal from the rail via an antenna provided on a train, and a reception signal received by the on-board receiving means by a signal having the same frequency as the train detection signal. It is characterized by an extracting means for performing a key processing to extract a PN code, and a train control data extracting means for detecting the predetermined PN code from the extraction signal extracted by the extracting means and extracting the train control data. ..

[0009]

In the above structure, the carrier means spread by the predetermined PN code is supplied to the starting end side of the rail forming the track circuit by the sending means. When the received signal received from the terminal end of the rail is demodulated using the carrier wave, a predetermined PN
The signal containing the code is extracted. When the predetermined PN code is present in this extracted signal, it is detected that there is no train. On the other hand, when there is a train on that rail, the signal level on the terminal end side of the rail is low, so the level of the extracted signal is low and the predetermined PN code is not detected. At this time, it is detected that there is a train. The PN code selection means uses a predetermined PN
The type of code is selected in association with predetermined train control data. The spread signal spread by the selected PN code is received by the on-board receiving means via the antenna provided in the train. Then, this received signal is demodulated using a signal having the same frequency as the train detection signal to extract a PN code. Then, the train control data extraction 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, in which a track (corresponding to a rail of the present invention and sometimes also referred to as a rail hereinafter) T is a closed section at predetermined intervals ( In FIG. 1, for simplification of the drawing, only three blocking sections are shown centering on the blocking section T.)
It is divided into T, T ', T ". Each block section T,
T ′ and T ″ may be a section using a well-known impedance bond, or may be a non-insulating section in which a capacitor or the like is interposed between rails.

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

First, in the transmitting section a, the signal generator 1 and A
A terrestrial PN code generator 2 controlled by a TC signal, spreading circuits 3 for spreading processing using a predetermined PN code generated from the terrestrial PN code generator 2, and a transmitter 4 are provided. The signal generator 1 is configured to output a carrier wave (f _c ) having a predetermined frequency to the spreading circuit 3. Also, the ground P
The N code generator 2 has different types of P corresponding to a plurality of (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 uses a predetermined PN code, for example, A
PN code (PN ₁ (θ _i )) corresponding to TC information (1)
(Θ _i represents the phase difference from the reference PN code, as shown in FIG. 2, so that the PN code used in the adjacent block sections T ′ and T ″ has a phase difference). After spreading the carrier wave (f _c ) using the PN code from the PN code generator 2, the rail T is transmitted through the transmitter 4.
Is configured to be supplied to the starting end side S of. The transmitter 4 is composed of a widening device.

The ground 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 by a well-known amplification circuit, and is configured to output its output signal to a demodulation circuit 11 which demodulates the carrier wave (f _c ) of the signal generator 1. Therefore, the original PN code (PN ₁ (θ _i )) is extracted from the demodulation circuit 11. Then, the train detection matched filter 13 inputs the PN code from the above-mentioned terrestrial PN code generator, inputs the output from the demodulator 11 via the filter 12, and when both input signals match, the track relay It is configured to enhance TR.

[0015] Incidentally, transmission, reception section b, the signal generator 1 so B is installed in the same equipment room, the corner at each terrestrial PN code generator 3 single, carrier from here (f _c), PN
The code (PN ₁ (θ _i )) can be supplied to the diffusion circuit 3 and the train detection matched filter 13 by wire. Therefore, the synchronization is stable, and the structure is simple and can be manufactured at low cost.

To the on-board receiving section C, 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 inputted to generate the above-mentioned signal. a demodulator 22 at the output signal from the signal generator 21 for outputting a vessel 1 and the same carrier (f _c) dividing process, a plurality of inputs the demodulated output processed by a demodulator 22 via the filter circuit 23 First to nth matched filters MF
_{1 to} FM ₂ are provided. Then, each PN from the on-board PN code generator 24 configured to output a plurality of PN codes PN _{1 to} PN _n that the transmitting section a side has in advance to these matched filters MF _{1 to} MF _n. It is configured so that each code can be input.

Next, the train detection operation of the apparatus of this embodiment will be described. Now, from the transmission unit a, the first train
Suppose that the ATC information 1 of the PN code (PN ₁ (θ
_i )) is output. First, a case where the train a does not exist in the closed section T will be described first. The carrier wave (f _c ) sent from the signal generator 1 is spread by the spreading circuit 3 using the PN code (PN ₁ (θ _i )), and is supplied to the starting end side S of the rail T via the transmitter 3. To be done.

On the terminal side 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) ) Is extracted. And the matched filter 13 for train detection
Is a PN code (PN ₁ (θ
_i )) based on the PN code (P
The presence of ₁ (θ _i )) is detected, and the track relay TR is raised by the detection signal.

Due to the above-mentioned diffusion and despreading processing, for example, noise caused by the harmonics of the commercial power source and noise transmitted from a train traveling on another track adjacent to the track T are present in the block section T. However, 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 outputs only when the PN code (PN ₁ (θ _i )) matches, the train detection noise resistance characteristic is remarkably excellent.

On the other hand, when the train a is present 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 terminating side R is low, and therefore the output level of the receiver 10 is also low. Therefore, the train detection matched filter 13 uses the PN code (PN ₁ (θ _i )).
The degree of coincidence cannot be detected and the trajectory relay TR drops without being maintained. By the fall of the track relay TR, it can be known that the train a was in the closed section T.

Next, the transmission of ATC information from the ground side (transmitting section B) to the vehicle (train a) will be described. In the receiver 20 provided in the train a, the PN code (P) corresponding to the first ATC information (1) is transmitted from the rail T via the antenna A.
The signal spread by N ₁ (θ _i ) is received. When the received signal is demodulated by the demodulator 23 using the carrier wave (f _c ), a signal including the PN code (PN ₁ (θ _i )) is extracted. The degree of matching of this 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.
Train a performs train control based on this output signal. The second
From the matched filter MF ₂ to the nth matched filter MF _n , the degree of coincidence of the PN code is not detected.
No ATC information is output. When the PN code (PN ₂ (θ _i )) corresponding to the second ATC information (2) is output from the terrestrial PN code generator 2, the output is obtained from the second matched filter MF ₂ . The same applies to the other ATC information (3) to (n).

As described above, since the apparatus of this embodiment is the track circuit using the spread signal, it is possible to send the ATC information to the train a together with the train detection without separately providing the ATC communication equipment.

[0023]

The train position detecting device according to the present invention spreads and supplies a carrier wave to a starting end side of a rail forming a track circuit with a predetermined PN code, and performs the spreading process from a trailing end side of the rail. A train configured to receive a signal and demodulate using the carrier wave to detect the predetermined PN code, and to detect the presence or absence of a train on the rail based on the change in the detected signal. In a train control communication device equipped with a detection means, a PN code selection means for selecting the type of the predetermined PN code in association with predetermined train control data, and a rail provided via an antenna provided in the train. An on-board receiving means for receiving a signal, and an extracting means for demodulating the received signal received by the on-board receiving means with a signal having the same frequency as the train detection signal to extract a PN code. Since the train control data extracting means detects the predetermined PN code from the extracted signal extracted by the extracting means and extracts the train control data, the train position detecting device has high noise resistance. At the same time, it becomes possible to transmit ATC information from the ground side to the train.

[Brief description of 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]

1 Signal Generator 2 Terrestrial PN Code Generator 10, 20 Receiver 11, 22 Demodulator 13 Train Detection Matched Filter 24 Onboard PN Code Generator MF _{1 to} MF ₂ 1st to nth Matched Filter

Claims (1)

[Claims] 1. A carrier which is spread and processed by a predetermined PN code is supplied to the start side of a rail forming a track circuit, and the spread signal is received from the end side of the rail, and the carrier is used. Demodulation process and then the specified PN
A train control communication device having train detecting means configured to detect a code and detect the presence or absence of a train on the rail based on a change in the detected signal, wherein the predetermined PN code type PN code selecting means for selecting in accordance with predetermined train control data, on-board receiving means for receiving a signal from the rail via an antenna provided on the train, and on-board receiving means Extraction means for demodulating the received signal with a signal having the same frequency as the train detection signal to extract a PN code, and the predetermined P from the extracted signals extracted by the extraction means.
A train control data extracting means for detecting the N code and extracting the train control data;