JPH05262235A - Communicating device for controlling train - Google Patents

Abstract

PURPOSE:To execute detection of a train using a track circuit by a spectral diffusion communication system and to transmit information of ATC by a system having high noise resistance. CONSTITUTION:A communicating device for controlling a train comprises control signal feeding means 2, 4, 7, and 8 to effect diffusion processing of a signal for controlling a train by means of a second PN code being the same as or different from a first PN code and having a given phase difference and feed the signal to the starting side S of a rail T, on-vehicle receiving means A and 20 for a signal from the rail T, a first fetching means to fetch a first PN code by effecting demodulation processing of a received signal by a demodulator 23, and a second fetching means to fetch a second PN code by effecting demodulation processing of the received signal by a demodulator 28. This device is also provided with first and second detecting means to detect first and second PN codes, respectively, from fetched signals, a phase detecting means 31 to detect a difference in a time between detection of the first PN code and detection of detection of the second PN code and detect a phase difference, and a signal output means for controlling a train based on the phase difference.

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, in a train control communication device using a track circuit, a rail of a block section formed by dividing a rail (track) into predetermined lengths is used as a part of the track circuit, and the rail of the block section is divided. It is configured by connecting a transmitter that sends out a signal of a predetermined frequency to the start side (the side where the train advances) and a receiver that receives the signal at the end side (the side where the train enters) of the closed section. Has been done.

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, the rail forming a part of the track circuit is in an environment susceptible to noise, so that the S / N ratio tends to be low, and the rails are adjacent to each other. In order to eliminate the mutual interference with the track, the carrier frequency is changed, or the resonance circuit is provided at the boundary of the track, so that the circuit configuration becomes complicated.

In order to solve the above-mentioned drawbacks, the applicant of the present invention, as a train position detecting device having high noise resistance, uses a predetermined PN code as a train detecting signal at the starting end of the rail forming the track circuit. The signal is spread and supplied, the spread signal is received from the terminal end of the rail, and the train detection signal is detected by despreading with the PN code. We proposed a train position detection device that detects the presence or absence of a train on the rail based on the change in the signal.

According to the above proposal by the applicant, a train position detecting device having high noise resistance can be realized. Since the proposed device has a feature of using a PN code, the inventors of the present invention utilize the feature to obtain A from the ground side.
We obtained the knowledge to send train information such as TC (hereinafter referred to as ATC information). Therefore, it is an object of the present invention to provide a train control communication device capable of transmitting ATC information having excellent noise resistance as well as train detection.

[0008]

In order to achieve the above object, a train control communication device according to the present invention provides a train detection signal to a first end of a rail forming a track circuit. The PN code is spread and supplied, the spread signal is received from the end side of the rail, and the train detection signal can be detected by despreading with the first PN code. In the train communication device having train detecting means configured to detect the presence or absence of a train on the rail based on the change in the detected signal, the same or different type as the first PN code. And a control signal supply means for spreading the train control signal with a second PN code having a predetermined phase difference from the first PN code and supplying the train control signal to the start side of the rail, and the control signal supply means. Signal from the rail via an antenna On-board receiving means, and first 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 the first PN code, Second extracting means for demodulating the received signal received by the on-board receiving means with a signal having the same frequency as the train control signal to extract the second PN code; and the first extracting means. The first detection means for detecting the first PN code from the extraction signal extracted by the second extraction means, and the second detection means from the extraction signals extracted by the second extraction means.
Second detecting means for detecting the second PN code and a time difference from the time when the first detecting means detects the first PN code until the second detecting means detects the second PN code. And a train control signal output means for outputting a train control signal based on the phase difference detected by the phase difference detection means. Are

[0009]

In the above structure, signals for train detection and train control are respectively spread by the first PN code and the second PN code and supplied to the starting end side of the rail forming the track circuit by the sending means. It Then, when there is no train on the rail, the train detection signal is extracted by despreading the received signal received from the terminal end of the rail using the first PN code. The extracted signal indicates a level higher than a predetermined level and detects the absence of 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, and the level of the extracted signal is low, indicating that there is a train. Further, the first PN code and the second PN are demodulated by demodulating with a signal having the same frequency as the train detection signal and a signal having the same frequency as the train control signal from the received signals received by the on-board receiving means.
Extract each code. The phase difference detecting means detects the first PN code and the second PN code by the first detecting means and the second detecting means from the extracted signal, and also detects the phase difference from the time difference between both detection timings. The train control signal means outputs a train control signal based on the phase difference.

[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 is a block section (corresponding to a rail (track) of the present invention, hereinafter also referred to as a rail) T
Is divided into block sections at predetermined intervals (only three block sections are shown around the block section T in FIG. 1 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 an uninsulated green 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 transmission section a, a train detection signal generator (hereinafter, referred to as detection signal generator) 1, a train control signal generator (hereinafter, referred to as ATC signal generator) 2, and a first P
There are provided first and second spreading circuits 5 and 6, an adding circuit 7 and a transmitter 8, which perform spreading processing with PN codes generated from the N code generator 3 and the second PN code generator 4, respectively. There is. The detection signal generator 1 is a train detection carrier wave in which an unmodulated or predetermined transmission signal is modulated by a modulation circuit into ordinary AM, FM, etc. (in the example of FIG. 1, it is configured in the case of no modulation). (Corresponds to the train detection signal of the present invention)
It is configured to output (f _TD ) to the first spreading circuit 5. Further, the ATC signal generator 2 is configured to output an ATC carrier wave (corresponding to a train control signal of the present invention) (f _ATC ) to the second spreading circuit 6.

The first spreading circuit 5 has a predetermined first PN code (PN (θi)) (θi represents a phase difference from the reference PN signal, and as shown in FIG. P used in adjacent block sections T ′ and T ″ by changing
A phase difference is generated with the N code. ) Is generated, the train detection carrier (f _TD ) is spread using the PN code from the first PN code generator 3 and then output to the next adding circuit 7. Further, the second spreading circuit 6 has the first PN code and a predetermined second PN code (PN ₂ (θr)) (r = i + α), and as shown in FIG. Represents the phase difference from the reference PN code, and α corresponds to the ATC information.) After the train control carrier (f _ATC ) is spread using the second PN code, the next addition circuit 7 It is configured to output to.

The transmitter 8 includes a well-known amplification circuit, and is configured to supply an output to the leading end side S of the rail T.

Next, the terrestrial receiving section B is provided with a receiver 10, a despreading circuit 11, a bandpass filter 12, and a detecting section 13 including a rectifying circuit and a detecting circuit. The receiver 10 is formed by a well-known widening circuit, and is configured to output its output signal to a despreading circuit 11 which performs despreading processing with the first PN code (PN ₁ (θi)). There is. 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-board receiver c has a receiver 20 for receiving the spread signal from the rail T via the antenna A provided on the train a, and one of the signals received by the receiver 20 as a bandpass signal. A demodulator 2 that inputs through a filter 21 and performs division processing with an output signal from a first signal generator 22 that outputs the same train detection carrier (f _TD ) as the above detection signal generator 1.
3 and the output demodulated by the demodulator 23 are input, and the same PN code (P
PN from the third PN code generator 24 to generate N ₁ ).
A first matched filter 25 for inputting a code (PN ₁ ) to perform correlation matching processing, and the other of the signals received by the receiver 20 via a bandpass filter 26 for inputting to the ATC signal generator 21. The demodulator 28 that divides by the output signal from the second signal generator 27 that outputs the same train control carrier (f _ATC ) and the output demodulated by the demodulator 28 are input, and the second train A fourth PN that generates the same PN code (PN ₂ ) as the PN code generator 4.
A second matched filter 30 which receives the PN code (PN ₂ ) from the code generator 29 and performs correlation matching processing.
And a detection signal of both matched filters 25 and 30 are input, a phase difference corresponding to the time difference at the time of detection of both matched filters 25 and 30 is detected, and ATC information corresponding to the phase difference is output. And 31 are provided.

Next, the operation of the apparatus of this embodiment will be described. First, the train detection operation will be described. First, a case where the train a does not exist in the rail T will be described.
The carrier wave (f _TD ) transmitted from the detection signal generator 1 is
The spread circuit 5 performs spread processing using the PN code (PN ₁ (θi)), and the spread signal for train control of the second spread circuit 6 is superimposed on the add signal by the adder circuit 7 to transmit the signal from the rail T via the transmitter 8. It is supplied to the starting end side S.

On the terminal side R of the rail T, there is a spread signal containing a carrier with attenuation due to the length of the rail T. Then, this spread signal is subjected to an amplification processing by the receiver 10 and then despread processing by the PN code (PN ₁ (θi)) from the first PN code generator 3 to obtain the original train detection carrier wave. (F _TD ) is extracted.

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 spread spectrum communication, these noises are effectively removed and only the original train detection carrier wave (f _TD ) is extracted. The extracted signal is processed by the detection unit 13 in the same manner as a well-known train detection device to raise the track relay TR.

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 detection unit 1
No. 3 cannot keep up the trajectory relay TR and falls. By the fall of the track relay TR, it can be known that the train a was in the closed section T. Of course, even when the train a is being detected, the output of the receiver 10 is despread by the despreading circuit 11, so noise is effectively removed.

Although the above-mentioned ground receiving section (b) extracts the carrier wave (f _TD ) for train detection by despreading processing, it extracts the PN code separately proposed by the applicant. Good.

When the train detection is performed by extracting the separately proposed PN code, first, the receiver 10 receives and demodulates the signal by the train detection carrier (fTD) from the detection signal generator 1, Extract the first PN code (PN1 (θi)),
This is configured to detect the first PN code with a matched filter equipped with a correlation matching circuit. According to such a configuration, when the PN code used on the transmitting section B side is detected on the ground receiving section B side, no train is detected, and on the other hand, when the PN code is not detected on the ground receiving section side. Can detect the presence of a train. Moreover, since the train detection is performed by the degree of coincidence of the PN code, the detection accuracy is improved in each step. Therefore, when the train detection signal is obtained by performing the despreading processing in the present invention, the detection of the degree of coincidence of the PN code is also included.

Next, the transmission of the ATC information from the ground side (transmission section B) to the vehicle (train a) will be described.
In the receiver 20 provided in the
To the first and second PN codes (PN ₁ (θi)),
(PN ₂ (θr)) is received. When this received signal is demodulated by the train detection carrier (fTD) by the demodulators 23 and 28, the first and second PN codes (PN ₁ (θi)), (PN
A signal containing ₂ (θr)) is extracted. This extracted signal is first and second matched filters 25 and 30.
The degree of coincidence with the second PN code is detected. Each matched filter 25, 30 sends a pulsed detection signal to the phase detector 31 for each detection. When the phase detector 31 detects a predetermined phase difference, it outputs ATC information corresponding to the phase difference.

The above explanation of the operation will be further explained with reference to the frequency allocation diagram of FIG. 3, where is the spectrum of the PN code. In the figure, the train detection carrier (f _TD ) and the train control carrier (f _ATC ) supplied to the starting side S of the rail T are respectively PN ₁ (θ _i ) and PN.
₂ (θ _r ) represents the spread signal subjected to spread processing. Therefore, the train detection signal (f _TD ) can be extracted by _performing despreading processing with PN ₁ (θ _i ) at the ground receiving section B. On the other hand, if de-spread the spread signal of the train a side f _TD,
PN code is obtained. Further, if the spread signal of is despread with f _TAC , the PN code of is obtained. Two P here
The N codes differ in phase by α.

Next, an example of transmitting a plurality of ATC information to the train from the transmitting unit B will be described. Each ATC information is recorded by changing the phase of the second PN code (PN ₂ (θr)). Supplied to Le T. That is, r of θr indicating the phase of the second PN code (PN ₂ (θr)) is set to i + α, α corresponding to ATC information is determined, and the spread signal is transmitted to the rail T. FIG. 4 shows each matched filter 25, 30.
The time difference between these detection signals is AT
The phase difference corresponding to the C information is represented.

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. Further, since the transmitting and receiving sections a and b are installed in the same equipment room, the first PN code generator 3
The carrier wave and PN code can be supplied to each of the spreading circuits 5 and 11 to the demodulation circuit 11 and the matched filter 12, respectively. In this case, it is possible to connect by wire and the synchronization process can be performed extremely easily.
Therefore, unlike the ordinary spread spectrum communication in which the transmitting and receiving equipment is isolated, it is not necessary to provide any complicated synchronizing circuit, so the stability of synchronization is high and the structure is simple and inexpensive to manufacture. it can.

[0027]

The train control communication device according to the present invention has the structure described in claim 1, that is, the train detection part on the ground side uses the spread spectrum communication, so that the train has high noise resistance. The PN code can be detected and used to prevent mutual interference with adjacent trajectories. Only by changing the phase of the PN code, it is possible to configure easily and with good separation performance. Further, the transmission of the ATC information to the vehicle is simple because the signal for ground side train detection is received and the ATC information is decoded using this signal as a synchronization (reference) signal.
Further, since the ATC information also uses the spread spectrum signal, it has excellent noise resistance.

In addition, the carrier frequency is f
Well two sine waves of _TD and f _ATC, as in the conventional apparatus, f _TD, never requiring any wave of f _ATC. In order to further eliminate interference in the up line and the down line, it can be easily realized by changing the type of PN code. In this case, switching between the up line and the down line is required only by changing the PN code type even on the on-board device side, and the configuration can be extremely simple.

[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.

FIG. 3 is an explanatory diagram showing a frequency relationship between a PN code and first and second spread signals.

FIG. 4 is a diagram showing a relationship between a PN code phase and ATC information in on-vehicle reception.

[Explanation of symbols]

1 detection signal generator 2 ATC signal generator 3, 4, 24, 29 1st, 2nd, 3rd and 4th P
N code generator 5,6 First and second spreading circuit 11 Despreading circuit 23,28 Demodulation circuit 22,27 First and second signal generator 25,30 First and second matched filter 31 Phase detection vessel

Claims (1)

[Claims] 1. A train detection signal is spread and supplied with a predetermined first PN code to the start end side of a rail forming a track circuit, and the train end signal is spread from the end side of the rail. A signal is received and the train detection signal is detected by despreading with the first PN code, and the presence or absence of a train on the rail is detected by the change in the detected signal. In the train control communication device including the train detecting means, the train is the second PN code which is the same as or different from the first PN code and which has a predetermined phase difference from the first PN code. Control signal supply means for spreading the control signal to the starting side of the rail, on-board receiving means for receiving the signal from the rail via an antenna provided in the train, and the vehicle The received signal received by the upper receiving means is used for the train inspection. The first P is subjected to demodulation processing with a signal having the same frequency as the intelligence signal.
First extracting means for extracting an N code, and demodulation processing of a reception signal received by the on-board receiving means with a signal having the same frequency as the train control signal to perform the second P
Second extracting means for extracting the N code, first detecting means for detecting the first PN code from the extracted signal extracted by the first extracting means, and extracting by the second extracting means Second detecting means for detecting the second PN code from the extracted signal, and the second detecting means for detecting the second PN code from the time when the first detecting means detects the first PN code. Phase difference detecting means for detecting the time difference until the PN code is detected and for detecting the predetermined phase difference, and for train control for outputting a train control signal based on the phase difference detected by the phase difference detecting means. A train control communication device comprising: a signal output unit.