JP4698293B2 - Train control device - Google Patents

Description

  The present invention relates to a train control device that automatically controls the speed of a train to be equal to or lower than a speed limit, and more particularly to an improvement in the transmission speed of train control information.

  The ground device of the train control device (hereinafter referred to as the ATC device) that automatically controls the speed of the train below the speed limit is based on the current stop target position and the current position determined in advance by the distance from the preceding train and the conditions of the route such as curves and branches. The train control signal that indicates the position of the current track is transmitted to the track circuit, and the on-board device is continuously based on the interval from the preceding train calculated from the received train control signal and the verification speed pattern to the stop target position. This is a method of changing the train speed.

  When transmitting this train control signal, in the AC electrification section, the harmonics of the operating current are extremely strong, and in order to separate this harmonic noise from the train control signal, select a frequency band that does not generate harmonic noise. The train control signal is transmitted. For this reason, it was difficult to improve the transmission speed of the train control signal.

In order to improve the transmission of the train control signal so that communication is possible even if this operating current harmonic noise enters, Patent Literature 1 and Patent Literature 2 disclose a train control device using a spread spectrum communication system. The train control device using this spread spectrum communication system, in the ground device, spread-spectrum-modulates the train control signal with a pseudo-noise code (hereinafter referred to as PN code), spreads it over a wide frequency band, and transmits it to the rail. A receiving unit of the on-board device that is mounted receives a signal obtained by spreading the spectrum transmitted to the rail, and spread-modulates the received signal using the same PN code as that of the ground device. When spread modulation is performed using this PN code, the noise signal mixed in the received signal is spread in spectrum, and the train control signal waves are collected in the original frequency band to the original train control signal generated by the ground device. Returned. The noise component is removed from the spread-modulated signal through a narrow-band band-pass filter to obtain a transmitted train control signal. In order to obtain a train detection signal by performing spread modulation in the receiving unit of this onboard device, it is necessary to match the phase of the PN code to be spread modulated with the phase of the received PN code. Since the received signal spread-modulated using the PN code has a very small S / N ratio and the synchronization timing cannot be extracted from the received signal by a normal method, the PN code of the on-board device is used as the PN code of the received signal. There is a need for synchronization acquisition that matches a sequence and converts it into a pulse signal, and synchronization maintenance that operates so that synchronization is not lost even if time elapses after completion of synchronization acquisition.
JP-A-7-329782 Japanese Patent No. 2701197

  In order to make the phase of the PN code that is spread-modulated by the receiving unit of the on-board device coincide with the phase of the received PN code as described above, if the receiving unit is provided with a synchronization acquisition unit and a synchronization holding unit, the configuration of the receiving unit is It becomes very complicated and it takes time to acquire synchronization. Further, in the non-insulated track circuit, there is a possibility that synchronization detection becomes difficult due to interference with the train control signal transmitted to the adjacent track circuit.

  The present invention improves such disadvantages, and spread spectrum modulation of a train control signal transmitted from a ground device without the need for synchronization acquisition means or synchronization holding means in the receiver on the vehicle and in the receiver on the vehicle An object of the present invention is to obtain a train control device that can detect a transmitted train control signal by synchronizing spread spectrum modulation.

The train control device of the present invention includes an ATC ground device and an on-board device, and the ATC ground device includes an ATC signal generation unit, a transformer, a synchronization signal generation unit, a spread code generation unit, a spread modulation unit, and a transmitter. The ATC signal generator generates an ATC signal having a current indication and a track circuit ID corresponding to the traveling position of the preceding train, and the transformer outputs an AC voltage from an AC power source that supplies power to the train line. The synchronous signal generator has a band pass filter, a waveform shaping circuit, and a frequency multiplying circuit, and the band pass filter receives the AC signal converted by the transformer. A noise component is removed and a sinusoidal AC signal is output to the waveform shaping circuit. The waveform shaping circuit shapes the input AC signal and outputs a pulse signal to the frequency multiplier circuit, and the frequency multiplier circuit. It converts the pulse signal input to the pulse signal having a frequency twice generates a synchronization signal corresponding to the frequency of the AC power supply, the spreading code generating unit preset by the synchronization signal generated by the synchronizing signal generator Generating a wideband PN code string, and the spread modulation unit spread-spectrum modulates the ATC signal created by the ATC signal generation unit with the PN code sequence generated by the spread code generation unit, and generates a signal wave, The transmitter sends a signal wave generated by a spread modulation unit to a rail, and the on-board device includes a receiver, a transformer, a synchronization signal generation unit, a spread code generation unit, a spread demodulation unit, a band pass filter, and a demodulator. The receiver receives a signal wave sent to the rail through the power receiver, and the transformer converts the AC voltage taken from the train line through the current collector into a low-voltage AC signal. And conversion, the synchronizing signal generator includes a bandpass filter and a waveform shaping circuit and a frequency Tei multiplying circuit, the band-pass filter to remove noise components by inputting an AC signal converted by the transformer sine A wave AC signal is output to the waveform shaping circuit, the waveform shaping circuit shapes the input AC signal and outputs a pulse signal to the frequency multiplier circuit, and the frequency multiplier circuit outputs the input pulse signal to 2 The signal is converted into a pulse signal having a double frequency to generate a synchronization signal according to the frequency of the AC power supply, and the spreading code generator is a broadband PN code predetermined by the synchronization signal generated by the synchronization signal generator The spread demodulation unit generates a signal wave by performing spread spectrum modulation on the signal wave received by the receiver using the PN code sequence generated by the spread code generation unit. The band-pass filter extracts a signal wave from which a noise component has been removed from the signal wave spread by the spread demodulation unit, and the demodulation unit demodulates the signal wave from which the noise component has been removed to obtain an ATC signal. .

  According to the present invention, a PN code sequence is generated by a synchronization signal corresponding to the frequency of an AC power source between an ATC ground device and an on-board device, and a PN code sequence that is spread spectrum modulated by the ATC ground device, and a spectrum is generated by the on-board device. Since the phase of the PN code string to be spread-modulated is reliably matched with a simple configuration, the ATC signal sent from the ATC ground device can be reliably detected by the on-board device and the time required for synchronization acquisition is shortened. Transmission efficiency can be improved.

  FIG. 1 is a block diagram showing the configuration of the train control device of the present invention. As shown in the figure, the train control device in the AC electrification section has an on-board device 3 mounted on the ATC ground device 1 and the train 2 connected to the boundary on the train advance side of each track circuit 1T to 3T. The ATC ground device 1 includes an ATC signal generation unit 4, a transformer 5, a synchronization signal generation unit 6, a spread code generation unit 7, a spread modulation unit 8, and a transmitter 9.

  The ATC signal generation unit 4 creates an ATC signal having an indication and a track circuit ID corresponding to the traveling position of the preceding train input from the condition communication circuit 10 and outputs the ATC signal to the spread modulation unit 8. The transformer 5 converts the AC voltage output from the AC power supply 12 that supplies power to the train line 11 into a low-voltage AC signal and outputs the AC signal to the synchronization signal generator 6. As shown in the block diagram of FIG. 2, the synchronization signal generator 6 includes a band pass filter (BPF) 13, a waveform shaping circuit 14, and a frequency multiplication circuit 15. The BPF 13 receives the AC signal converted by the transformer 5, removes a noise component, and outputs a sine AC signal to the waveform shaping circuit 14. The waveform shaping circuit 14 shapes the input AC signal and outputs the pulse signal to the multiplier circuit 15 by frequency. The frequency multiplying circuit 15 converts the input pulse signal into a pulse signal having a doubled frequency, for example, and outputs a synchronization signal corresponding to the frequency of the AC power supply 12 to the spreading code generator 7. The spread code generator 7 generates a predetermined wide-band PN code string based on the input synchronization signal and outputs it to the spread modulator 8. The spread modulation unit 8 performs spread spectrum modulation on the ATC signal input from the ATC signal generation unit 4 using the PN code sequence input from the spread code generation unit 7, and spreads the signal to a frequency band far wider than the frequency band of the ATC signal. Generate waves. The transmitter 9 sends the signal wave generated by the spread modulation unit 8 to the rail 16.

  The on-board device 3 includes a receiver 17, a transformer 18, a synchronization signal generator 19, a spread code generator 20, a spread demodulator 21, a bandpass filter (BPF) 22, and a demodulator 23. The receiver 17 receives the signal wave transmitted to the rail 16 via the power receiver 24. The transformer 18 converts the AC voltage taken in from the train line 11 via the current collector 25 into a low-voltage AC signal and outputs it to the synchronization signal generator 19. The synchronization signal generation unit 19 has the same configuration as the synchronization signal generation unit 6 of the ATC ground device 1, and generates a synchronization code corresponding to the frequency of the AC power source 12 by inputting the AC signal converted by the transformer 18. To the unit 20. The spread code generation unit 20 generates the same PN code string as the spread code generation unit 7 of the ATC ground apparatus 1 based on the input synchronization signal, and outputs it to the spread demodulation unit 21. The spread demodulation unit 21 spreads the noise signal mixed in the received signal wave by performing spread spectrum modulation on the signal wave received by the receiver 17 using the PN code sequence input from the spread code generation unit 20 to a wide frequency band, and thereby an ATC signal. A signal wave collected in the original frequency band is generated. The BPF 22 extracts a signal wave from which the noise component has been removed from the signal wave spread by the spread demodulation unit 21, and the demodulation unit 23 demodulates the signal wave from which the noise component has been removed to obtain an ATC signal.

  Processing when the ATC ground device 1 of the train control device configured as described above transmits a signal wave including an ATC signal to the rail 16 and the transmitted signal wave is received by the on-board device 3 to detect the ATC signal. This will be described with reference to the waveform diagrams of FIGS.

  The ATC ground device 1 converts the AC voltage output from the AC power supply 12 into a low-voltage AC signal by the transformer 5 and outputs it to the synchronization signal generator 6. When the train 2 enters the track circuit 2T in this state, the ATC signal generation unit 4 of the ATC ground device 1 receives the ATC signal having the indication and the track circuit ID according to the traveling position of the preceding train input from the condition communication circuit 10. And output to the spread modulation unit 8. At the same time, the synchronization signal generator 6 generates a synchronization signal corresponding to the frequency of the AC power supply 12 from the AC signal output from the transformer 5 and outputs it to the spreading code generator 7. When the synchronization signal generating unit 6 generates a synchronization signal corresponding to the frequency of the AC power supply 12, the BPF 13 of the synchronization signal generating unit 6 removes the noise component of the AC signal input from the transformer 5, and FIG. ), A sinusoidal AC signal is output to the waveform shaping circuit 14. The waveform shaping circuit 14 shapes the pulse signal into a pulse signal as shown in FIG. 3B, for example, with zero volts of the input AC signal as a threshold value, and outputs the pulse signal to the multiplier circuit 15. As shown in FIG. 3C, the frequency multiplying circuit 15 converts the input pulse signal into, for example, a pulse signal having a doubled frequency, and converts the synchronization signal composed of the converted pulse signal to the spread code generator 7. Output to. The spread code generator 7 generates a wideband PN code string based on the input synchronization signal and outputs it to the spread modulator 8 as shown in FIG. The spread modulation unit 8 performs spread spectrum modulation on the ATC signal input from the ATC signal generation unit 4 using the PN code sequence input from the spread code generation unit 7, and spreads the signal to a frequency band far wider than the frequency band of the ATC signal. A wave is generated and output to the transmitter 9. The transmitter 9 sends the input signal wave to the rail 16 of the track circuit 2T.

  On the other hand, when the receiver 17 of the on-board device 3 receives the signal wave transmitted to the rail 16 via the power receiver 24, the receiver 17 sends the received signal wave to the spread demodulation unit 21. As shown in FIG. 4A, a noise signal is added to the signal wave sent to the spread demodulation unit 21 when propagating on the rail 16. The spread demodulation unit 21 performs spread spectrum modulation on the transmitted signal wave with a PN code string generated in the spread code generation unit 20 by a synchronization signal corresponding to the frequency of the AC power supply 12, and the result is shown in FIG. As shown, a noise signal mixed in the received signal wave is spread over a wide frequency band to generate a signal wave in which ATC signals are collected in the original frequency band and sent to the BPF 22. As shown in FIG. 4C, the BPF 22 removes the noise component from the transmitted signal wave, extracts and amplifies the ATC signal wave, and sends it to the demodulator 23. The demodulator 23 demodulates the sent ATC signal wave to obtain an ATC signal.

  Thus, since the ATC ground device 1 and the on-board device 3 generate the PN code string by the synchronization signal corresponding to the frequency of the AC power supply 12, the PN code string to be spread spectrum modulated by the ATC ground device 1, The phase of the PN code string subjected to spread spectrum modulation by the on-board device 3 can be made to coincide with each other, the ATC signal sent from the ATC ground device 1 can be surely detected by the on-board device 3, and the synchronization acquisition is performed. Transmission time can be increased by shortening the time required for the transmission.

It is a block diagram which shows the structure of the train control apparatus of this invention. It is a block diagram which shows the structure of a synchronizing signal generation part. It is a waveform diagram of the output of each component of the synchronization signal generator and the PN code string. It is a spectrum distribution diagram of the output of the receiver of the on-board device, the spread demodulation unit, and the BPF.

Explanation of symbols

1; ATC ground device, 2; train, 3; on-board device, 4; TC signal generator, 5; transformer,
6; synchronization signal generator, 7; spread code generator, 8; spread modulator, 9; transmitter,
10: Condition communication circuit, 11: Train line, 12: AC power supply, 13: BPF,
14; waveform shaping circuit, 15; frequency multiplying circuit, 16; rail, 17; receiver,
18; Transformer, 19; Synchronization signal generator, 20; Spread code generator, 21; Spread demodulator,
22; BPF, 23; demodulator, 24; power receiver, 25; current collector.

Claims (1)

An ATC ground device and an on-board device,
The ATC ground device includes an ATC signal generation unit, a transformer, a synchronization signal generation unit, a spread code generation unit, a spread modulation unit, and a transmitter.
The ATC signal generator generates an ATC signal having an indication and a track circuit ID corresponding to the traveling position of the preceding train, and the transformer generates an AC voltage output from an AC power source that supplies power to the train line with a low voltage. The synchronous signal generator has a band pass filter, a waveform shaping circuit, and a frequency multiplication circuit, and the band pass filter removes noise components by inputting the AC signal converted by the transformer. The sine wave AC signal is output to the waveform shaping circuit, the waveform shaping circuit shapes the input AC signal and outputs a pulse signal to the frequency multiplier circuit, and the frequency multiplier circuit receives the input pulse. signal to generate a synchronization signal corresponding to the frequency of conversion to AC power to a pulse signal having a frequency twice the spreading code generating unit Ah by the synchronization signal generated by the synchronizing signal generator A wideband PN code string determined in advance is generated, and the spread modulation unit spread-spectrum-modulates the ATC signal created by the ATC signal generation unit with the PN code sequence generated by the spread code generation unit, and generates a signal wave. And the transmitter sends out the signal wave generated by the spread modulation unit to the rail,
The on-board device includes a receiver, a transformer, a synchronization signal generator, a spread code generator, a spread demodulator, a bandpass filter, and a demodulator.
The receiver receives a signal wave sent to a rail through a power receiver, the transformer converts an AC voltage taken from a train line through a current collector into a low-voltage AC signal, and the synchronization signal The generating unit includes a bandpass filter, a waveform shaping circuit, and a frequency multiplying circuit, and the bandpass filter receives an AC signal converted by the transformer and removes a noise component to convert the sine AC signal into the AC signal. Output to the waveform shaping circuit, the waveform shaping circuit shapes the input AC signal and outputs the pulse signal to the frequency multiplying circuit, and the frequency multiplying circuit has the input pulse signal having twice the frequency. It is converted into a pulse signal and generates a synchronization signal corresponding to the frequency of the AC power supply, the PN code sequence wideband said spreading code generation section is predetermined by the synchronization signal generated by the synchronizing signal generator The spread demodulation unit generates a signal wave by performing spread spectrum modulation on the signal wave received by the receiver using a PN code sequence generated by the spread code generation unit, and the band-pass filter is generated by the spread demodulation unit. A train control apparatus, wherein a signal wave from which a noise component has been removed is extracted from a spread signal wave, and the demodulator demodulates the signal wave from which the noise component has been removed to obtain an ATC signal.

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