JPH11298373A - Information transmitter for train control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the twist point passing of the cross guide line of a train on a ground side as well. SOLUTION: An on-vehicle device (a) performs the spread modulation processing of prescribed information by using a prescribed first spread spectrum signal, sends it out to one of a pair of antennas 3a and 3b, performs the spread modulation processing by using a prescribed second spread spectrum signal provided with a prescribed phase difference to the prescribed first spread spectrum signal and sends it out to the other one of the pair of the antennas. A ground device (b) extracts the prescribed information by performing the demodulation processing of signals received through the cross guide line L1 by using the first spread spectrum signal and the second spread spectrum signal and detects twist points T1 and T2 based on the elimination of the first spread spectrum signal and the elimination of the second spread spectrum 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 information transmission device using a cross guide line.

[0002]

2. Description of the Related Art FIG. 3 is a schematic block diagram of a conventional train control information transmission apparatus for transmitting predetermined information such as a train number from an on-vehicle (train) to the ground via a cross guide line.

A plurality of crossing guide lines L are laid on the ground along the track on which train A travels, and are formed by being twisted at predetermined lengths along the track (to simplify the drawing). For this reason, only three loops are shown here). The loops L1, L2 and L3 are shown.

An on-board device a 'mounted on a train a includes a modulator 1 for modulating a carrier having a predetermined frequency with data (information) to be transmitted to the ground, such as a train number, and the modulator 1. The modulated signal is transmitted to an antenna (car body) 3a via a transmitter 2a composed of an amplifier or the like, and a carrier wave from the modulator 1 is converted to a phase converter 2b '.
After the phase is changed by 90 °, the signal is transmitted to the antenna 3b via the transmitter 2b similar to the transmitter 2a.

[0005] The antennas 3a and 3b are provided at a lower portion of the train A and opposed to the cross guide line L at a predetermined interval in the traveling direction of the train A. That is, the distance between the antennas 3a and 3b is determined by the twist points T1 and T1 at the boundaries between the loops L1, L2, L2 and L3 where the train A is in front and behind.
2 respectively, when one antenna 3a faces the loop L1 or L2, the other antenna 3b
Are determined so as to be able to face the lubes L2 and L3, respectively. That is, the distance between the antennas 3a and 3b is
It is determined so that the twist points T1 and T2 can be positioned in the middle.

[0006] The ground equipment b 'includes a band-pass filter 10 for filtering a signal received from the cross guidance line L;
The demodulator 11 demodulates the filtered signal to extract information from the vehicle.

In the above-mentioned conventional train control information transmission device, the ground device b 'can receive information from the vehicle from the antenna 3a or 3b according to the state of the twisting of the cross guide line L. Information can be received while preventing loss of information when passing through the twist points T1 and T2.

[0008]

However, the above-mentioned conventional train control information transmission apparatus can continuously receive information from the vehicle on the ground side, but cannot detect passage of the train at the twist point. In addition, on the ground side, there is a drawback that the train position cannot be detected using the passing of the twist point, and a separate train position detecting device is required.

The present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to provide a train control information transmission device capable of detecting a train passing through a twist point on the ground side. To provide.

[0010]

In order to achieve the above object, a train control information transmission device according to the present invention is laid along a track on which a train travels and has a predetermined length along the track. And a pair of antennas provided at predetermined intervals so as to be able to be located with the twisted point interposed therebetween, and a plurality of loops formed with a twisted point. An on-board device mounted on the train capable of transmitting predetermined information toward the cross guidance line via the antennas, and extracting the predetermined information from a signal received via the cross guidance line In a train control information transmission device comprising a ground device, the on-board device performs spread modulation processing on the predetermined information using a predetermined first spread spectrum signal, and performs one of the pair of antennas. A To the antenna, and spread-modulates the predetermined first spread-spectrum signal using a predetermined second spread-spectrum signal having a predetermined phase difference with respect to the predetermined first spread-spectrum signal. And the ground equipment extracts the predetermined information by demodulating the signal received via the cross guide line using the first spread spectrum signal and the second spread spectrum signal. Detecting the twist point based on the disappearance of the first spread spectrum signal and the disappearance of the second spread spectrum signal.

[0011]

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 information transmission device according to one embodiment. Note that FIG.
The same components as those of the conventional device are denoted by the same reference numerals and described.

A plurality of crossing guide lines L are laid on the ground along the track on which train A travels and are formed by being twisted at predetermined lengths along the track (simplified drawing). For this reason, only three loops are shown here). The loops L1, L2 and L3 are shown.

A predetermined spread spectrum signal (hereinafter, referred to as "SS signal") is provided on the on-board device a mounted on the train A.
, And a delay circuit D for delaying the SS signal sent from the SS signal generator PNG by a predetermined phase difference. further,
The on-board device a has a first spread modulation section 1a that performs spread modulation processing of data (information) to be transmitted to the ground, such as a predetermined train number, using an SS signal that has not been subjected to delay processing. The signal subjected to the spread modulation processing at 1a can be transmitted to an antenna (car upper) 3a via a transmitter 2a composed of an amplifier or the like. The on-board device a is
SS to delay the data to be transmitted to the ground by delay circuit D
It has a second spreading modulator 1b that performs spreading processing with a signal, and is configured to be able to transmit to an antenna 3b via a transmitter 2b similar to the transmitter 2a.

The antennas 3a and 3b are provided at a lower portion of the head of the train A at a predetermined interval in the traveling direction of the train A and opposed to the cross guide line L, similarly to the conventional device of FIG. ing. That is, both antennas 3a, 3b
The interval between the loops L1, L2, L2
, L3, respectively, and when one of the antennas 3a faces the loop L1 or L2, the other antenna 3b can face the lube L2 or L3, respectively. Have been. That is, the interval between the antennas 3a and 3b is set at the middle of the
, T2.

The ground equipment b includes a band-pass filter 10 for filtering a signal received from the cross guidance line L, and a synchronization detector for detecting a correlation value of the SS signal used in the on-board equipment a and detecting a synchronization state. 11 and S used in the on-board device a at the synchronization timing detected by the synchronization detection unit 11.
An SS signal generator P for generating the same SS signal as the S signal
NG, a first despreading circuit 12a for despreading the received signal with the SS signal from the SS signal generator PNG,
A second despreading circuit 12b that despreads the received signal through a delay circuit D that generates the same delay state as the delay of the on-board device a from the SS signal from the signal generator PNG, and a first despreading circuit 12a. A first demodulation unit 13a that demodulates the signal subjected to the despreading processing to extract information from the vehicle, and demodulates a signal despread by the second despreading circuit 12b to obtain information from the vehicle. A second demodulation unit 13b to be extracted;
a) and an OR circuit 14 for taking out as reception data via the data extracted in 13b.

The information from the vehicle taken out from the OR circuit 14 can be received from the antenna 3a or 3b near the twist points T1 and T2 of the cross guide line L, so that the twist points T1 and T2 Information can be received while preventing loss of information at the time of passage.

In FIG. 1, reference numeral 15 denotes a twist point detection circuit,
The twist points T1 and T2 can be detected based on the synchronous signal of the SS signal detected by the synchronous detection circuit 11.

The time chart of FIG. 2 shows the state of the SS signal generated from the SS signal generator PNG provided in the on-board device a and transmitted to the ground side. The unit 11 performs synchronization detection in a state corresponding to the transmission state of the on-board device a, that is, in the same state as the time chart of FIG. In FIG. 2, D
Indicates a state delayed by the delay circuit D, and represents an SS signal transmitted from the antenna 3b.

Each of the antennas 3a and 3b is connected to each loop L1.
, L2, and L3, respectively,
As shown in FIG. 2, in the synchronization detection state of the synchronization detection unit 11, two synchronizations corresponding to the respective antennas 3a and 3b are obtained, but one of the antennas 3a (or 3b) is connected to the twist point T1, When T2 and T3 are reached, synchronization corresponding to one of the antennas 3a (or 3b) cannot be obtained. That is, one of the SS signals is lost. Therefore, the twist point detection circuit 15 can detect that the train A has passed each of the twist points T1 and T2 based on the disappearance of the synchronization signal, and thereby, on the ground side, the position of the train A Can be detected.

As described above, the information from the upper side of the vehicle can be received on the ground side without being lost even when passing through the twist points T1 and T2.
By detecting passage of T2, the position of the train A can be detected.

Although not shown in FIG. 1, when predetermined information such as speed information is transmitted from the ground device b to the vehicle via the cross guide line L, either the antenna 3a or 3b , So that there is no loss of information from the ground side at the twist points T1 and T2.
Since the reception is interrupted when the antennas 3a and 3b pass through the twist points T1 and T2, the interruption can be detected and the twist points T1 and T2 can be detected.

In the above example, three loops L1, L2, L3 in the cross guide line L are used. However, this is for convenience of explanation, and even if more loops are included. The good thing is, of course.

[0023]

In the train control information transmission device according to the present invention, the on-board device performs spread modulation processing of predetermined information using a predetermined first spread spectrum signal and performs one of a pair of antennas. The first antenna is transmitted to an antenna and spread-modulated using a predetermined second spread-spectrum signal having a predetermined phase difference with respect to the predetermined first spread-spectrum signal. And the ground equipment transmits the signal received via the cross guide line to the first spread spectrum signal and the second
Demodulation processing using the spread spectrum signal to extract the predetermined information, and detecting the twist point based on the disappearance of the first spread spectrum signal and the disappearance of the second spread spectrum signal. Therefore, information from the upper side of the car can be received on the ground side without being lost even when passing through the twist point, and on the ground side, it is possible to detect the passage of the twist point and detect the position of the train it can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a train control information transmission device according to an embodiment of the present invention.

FIG. 2 is a time chart of an SS signal.

FIG. 3 is a schematic configuration diagram of a conventional train control information transmission device.

[Explanation of symbols]

 1a first spreading modulator 1b second spreading modulator 2a, 2b transmitter 3a, 3b antenna 10 bandpass filter 11 synchronization detector 12a first despreading circuit 12b second despreading circuit 13a first demodulator 13b second demodulation Unit 14 OR circuit 15 Twist point detection circuit PNG Spread spectrum signal (SS signal) generator D Delay circuit a On-board device b Ground device A Train L Crossing guide line L1, L2, L3 Loop T1, T2 Twist point

Claims (1)

[Claims] 1. A cross guide wire comprising a plurality of loops laid along a track on which a train travels and having twist points at predetermined lengths along the track, and In addition to having a pair of antennas provided at a predetermined interval so that they can be located across the bridge point,
An on-board device mounted on the train capable of transmitting predetermined information toward the cross guidance line via the antennas, and extracting the predetermined information from a signal received via the cross guidance line In a train control information transmission device including a ground device, the on-board device performs spread modulation processing of the predetermined information using a predetermined first spread spectrum signal, and performs one of the pair of antennas. And spread modulation processing using the predetermined second spread spectrum signal having a predetermined phase difference with respect to the predetermined first spread spectrum signal, and to the other of the pair of antennas Transmitting the signal received via the cross guide line using the first spread spectrum signal and the second spread spectrum signal. Processing the predetermined information, and detecting the twist point based on the disappearance of the first spread spectrum signal and the disappearance of the second spread spectrum signal. Information transmission device.