JP2013102618A - Train control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate detection of a phase change corresponding to train control information of an ATC signal transmitted from the ground side to an on train side.SOLUTION: A phase detection means that detects a phase of a carrier wave of an amplitude modulated signal transmitted from ground equipment and outputs phase information is composed by including: an A/D converter 31 that converts amplitude modulated signals into digital signals; a multiplier group 32 comprising N pieces of multipliers that multiply a digital amplitude modulated signal from an A/D converter 31 by internal carrier waves that are displaced the phase by 2π/N by same amplitude and frequency of the basic carrier wave; a low-pass filter group 33 comprising N pieces of low-pass filters that extracts DC components of output values of each multiplier; and a phase difference detection means 34 that detects the phase of the internal carrier wave where the low pass filter output value of intermittent each signal part of the amplitude modulated signals becomes the maximum, detects the relative phase difference of internal carrier waves between signal parts mutually adjoined, outputs the phase information based on the relative phase difference.

Description

  The present invention relates to train control information, and more particularly, to a train control apparatus suitable for ATC (Automatic Train Control).

  Conventionally, this type of train control device is composed of a ground device provided on the ground side and an on-board device mounted on the train side, and transmits and transmits a predetermined train control signal from the ground device to the train. The train control signal received is received by the on-board device, and predetermined train control such as speed control is performed.

  As described in Patent Document 1, as this type of train control device, the phase of the carrier wave of the train control signal transmitted from the ground side to the vehicle upper side is made to correspond to the train control information, and the phase of the carrier wave is predetermined from the ground side. There is one configured to transmit train control information corresponding to the phase to the vehicle upper side by transmitting the train control signal changed to the vehicle phase to the vehicle upper side.

  The train control device described in Patent Document 1 performs phase modulation processing on a carrier wave having a predetermined frequency with a predetermined phase corresponding to predetermined train control information, and performs amplitude modulation processing on the phase modulation signal from the ground device to the vehicle. Send to device. The on-board device detects the phase of the carrier wave in the received amplitude modulation signal using a PLL circuit, extracts train control information from the detected phase, and controls the train based on the extracted train control information.

JP 2008-13043 A

  However, when a PLL circuit is used for phase detection of a carrier wave of an amplitude modulation signal as in the conventional train control device described in Patent Document 1, it is necessary to synchronize with an input signal. Further, in order to detect a phase change of the carrier wave of the amplitude modulation signal, it is necessary to capture and hold synchronization. Furthermore, in the case of a signal in which a part of a carrier wave is intermittent, such as an amplitude modulation signal, it is difficult to maintain synchronization. For this reason, a train control apparatus having a function of transmitting predetermined train control information by changing the phase of the carrier wave of the amplitude modulation signal is required to be able to perform the carrier wave phase detection process more easily.

  The present invention has been made paying attention to the above-mentioned problems. The received signal is multiplied by an internal carrier wave whose phase is shifted by a constant value, and the phase detection process of the received signal is performed based on the multiplication result. An object of the present invention is to provide a train control device that facilitates processing.

  For this reason, the present invention detects a phase of an apparatus that transmits a signal in which the phase of a basic carrier wave is changed in accordance with train control information, receives the signal transmitted from the apparatus, and detects the phase of the signal. An apparatus for extracting the train control information from the phase information and controlling the train, wherein the received signal is an internal carrier whose phase is shifted by a constant value at the same amplitude and frequency as the basic carrier. And the phase information of the received signal is output based on the phase information of the internal carrier that substantially matches the received signal in the multiplication result.

  In such a configuration, the transmission side device performs phase modulation on the basic carrier wave and changes the phase to correspond to the train control information for transmission. The receiving side device receives the signal transmitted from the transmitting side device, multiplies the received signal by an internal carrier wave having the same amplitude and frequency as the basic carrier wave, and shifts the phase by a certain value, respectively. Based on the phase information of the substantially matching internal carrier wave, phase information corresponding to the train control information of the received signal is obtained, and the train control information is extracted to control the traveling of the train.

  According to the train control device of the present invention, the reception signal is multiplied by an internal carrier wave whose phase is shifted by a constant value at the same amplitude and frequency as the basic carrier wave, and the phase information of the reception signal is detected from the multiplication result. Compared to the case where a conventional PLL circuit is used, it is not necessary to acquire and hold synchronization with respect to the input signal, and the phase change detection process of the carrier wave can be easily performed.

It is a schematic structure figure showing one embodiment of a train control device concerning the present invention. It is a figure which shows the example of a waveform of the amplitude modulation wave which added subinformation to the carrier wave. It is a block diagram which shows the structure of the phase detection circuit of embodiment same as the above. It is a block diagram of a multiplier group and a low-pass filter group.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1: shows the schematic block diagram of one Embodiment of the train control apparatus of this invention.
In FIG. 1, the train control device of this embodiment includes a ground device a provided on the ground side and an on-board device b mounted on the train A. Then, an ATC signal corresponding to the train control information (for example, allowable speed information of the train) corresponding to the distance from the preceding train and the condition of the route from the ground device a is displayed in the right direction in the figure. Is transmitted from the right end side of the rail of the track circuit T in the figure, and when the onboard device b receives this ATC signal, the train control information is extracted from the ATC signal, and the train control information is extracted based on the extracted train control information. It is comprised so that driving | running | working may be controlled. The track circuit T is formed by rails, and is electrically insulated from the rails forming the front and rear track circuits T ′ and T ″ with respect to the AC signal. By differentiating the signal current frequency for train detection transmitted to the rail and the signal current frequency for train detection transmitted to the rails of the front and rear track circuits T ′, T ″, the track circuit T and the front and rear track circuits T ′, T It may be an uninsulated track circuit that does not require electrical insulation.

  The ground device a includes a carrier wave generation circuit 1 that generates a basic carrier wave f0 having a predetermined frequency. The basic carrier wave f0 generated from the carrier wave generation circuit 1 is input to the modulation circuit 2 via the phase shift circuit 4 described later. The modulation circuit 2 is configured to amplitude-modulate the basic carrier wave f0 with the modulated wave f1 or the modulated wave f2 corresponding to the train control information input from the main information selection circuit 3. The first main information F1 corresponding to the modulated wave f1 and the second main information F2 corresponding to the modulated wave f2 are, for example, ATC signals indicating allowable speed information for the train A. For example, the first main information F1 is an ATC signal indicating an allowable speed of 45 km / h for the train A, and the second main information F2 is an ATC signal indicating an allowable speed of 15 km / h for the train A. . Here, in order to simplify the explanation, the main information transmitted from the ground to the vehicle is two, but it goes without saying that the number of main information is not limited to two.

  The phase shift circuit 4 is synchronized with the main information selection circuit 3 and the sub information selected by the sub information selection circuit 5 that selects sub information that is train control information different from the first main information F1 and the second main information F2. The basic carrier wave f0 from the carrier wave generation circuit 1 is phase-modulated with a phase corresponding to the information. As the sub information, in the present embodiment, for example, the first sub information (+ π / 2) in which the phase of the carrier wave f0 is advanced by + π / 2 (+ 90 °) and the second sub information in which the phase of the carrier wave f0 is unchanged ( 0) and the third sub information (−π / 2) in which the phase of the carrier wave f0 is advanced by −π / 2 (−90 °). The first sub information (+ π / 2), the second sub information (0), and the third sub information (−π / 2) are, for example, ATC signals indicating signal display information for train A. For example, the first sub information (+ π / 2) is an ATC signal indicating that a plurality of track circuits ahead of train A (track circuit on the right side in FIG. 1) is in progress, and the second sub information (0) is an ATC signal indicating that the track circuit is a warning indication, and the third sub information (−π / 2) is an ATC signal indicating that the track circuit is a stop indication. . Here, the phase shift circuit 4 corresponds to a phase modulation means for changing a basic carrier wave having a predetermined frequency to a predetermined phase corresponding to predetermined train control information.

  FIG. 2 is a waveform example of an ATC signal to which main information and sub information transmitted from the ground device a are added. The waveform in FIG. 2 is an example of an ATC signal to which first main information F1 (modulated wave f1) and first sub information (+ π / 2) are added. That is, it is an ATC signal obtained by amplitude-modulating a phase-modulated signal whose phase is advanced by + π / 2 (+ 90 °) for each intermittent signal portion with respect to the basic carrier wave f0 with the modulation wave f1. In FIG. 2, A, B, and C indicate signal portions where the ATC signal (amplitude modulation signal) is intermittent.

  The ATC signal subjected to the amplitude modulation processing by the modulation circuit 2 is amplified by the power amplifier 6 and supplied to the rail forming the track circuit T via the connection transformer 7. Such a ground device a is also provided in the adjacent track circuits T ′ and T ″, but is omitted here.

Next, the on-board device b will be described.
The on-board device b receives the ATC signal transmitted from the ground device a to the rail via the power receiver 10 provided in front of the train A and facing the rail, and amplifies the received ATC signal. 11 can be amplified.

  The on-board device a includes a main information receiving unit 12 and a sub information receiving unit 13. The main information receiving unit 12 operates the first main information receiving relay 15 when a signal corresponding to the first main information F1 can be received through the filter circuit 14 in the received signal, When a signal corresponding to the second main information F2 can be received via the filter circuit 16, the second main information reception relay 17 can be operated.

  The sub-information receiving unit 13 extracts train control information (sub-information) based on phase information output from the phase detection circuit 30 that is a phase detection unit that is a feature of the present invention described later, and extracts the train control information. The sub information reception relay corresponding to (sub information) can be operated. Specifically, when the phase information received from the phase detection circuit 30 is + π / 2 (first sub information), the first sub information reception relay 18 is operated, and the phase information received from the phase detection circuit 30 is 0 (first sub information). 2 sub-information), the second sub-information receiving relay 19 is operated. When the phase information received from the phase detection circuit 30 is −π / 2 (third sub-information), the third sub-information receiving relay 20 is operated. It is configured to be able to. Here, the main information receiving unit 12, the sub information receiving unit 13, the first and second main information receiving relays 15 and 17, and the first to third sub information receiving relays 18, 19, and 20 constitute a train control means. .

Next, the phase detection circuit 30 that is a feature of the present invention will be described.
FIG. 3 is a block diagram showing a configuration of the phase detection circuit 30 of the present embodiment.
In FIG. 3, the phase detection circuit 30 of this embodiment includes an A / D converter 31, a multiplier group 32, a low-pass filter group 33, and a phase difference detection circuit 34.

  The A / D converter 31 samples an analog ATC signal, which is an amplitude modulation signal amplified by the amplifier circuit 11, at a predetermined interval and converts it into a digital signal. The converted digital ATC signal is used as a multiplier group 33. Output to.

As shown in FIG. 4, the multiplier group 33 is composed of N (N: natural number) multipliers 32-1 to 32-N, and the multipliers 32-1 to 32-N are A / D converters. The digital ATC signal input from 31 has N internal carriers sin (ωt + φi) (φi = 2πi / N: i = 0 to 0) with the phase and the same amplitude and frequency as the basic carrier f0 shifted by a constant value, for example, 2π / N. (N-1)). That is, assuming that the digital ATC signal is sin (ωt + θ), sin (ωt + θ) · sin (ωt + φi) (i = 0 to (N−1)) is respectively calculated by the multipliers 32-1 to 32-N. . Here, θ indicates the phase information corresponding to the sub information transmitted from the ground device a, and φi indicates the phase shift amount of the internal carrier wave. For example, when there are 36 multipliers (N = 36), the amount of phase shift of the internal carrier φi = πi / 18, and 36 internal components from 0 to 10 ° (π / 18) up to 35π / 18. The carrier wave is multiplied by the digital ATC signal sin (ωt + θ) by the multipliers 32-1 to 32-N. The internal carrier sin (ωt + φi) is generated using, for example, a ring oscillator. Each multiplier 32-1 to 32-N generates an output of the following equation (1).
sin (ωt + θ) · sin (ωt + φi)
= (1/2) · {cos (θ−φi) −cos (2ωt + (θ + φi))} (1)

  As shown in FIG. 4, the low-pass filter group 33 includes N low-pass filters 33-1 to 33-N provided corresponding to the multipliers 32-1 to 32-N of the multiplier group 32. The low-pass filters 33-1 to 33-N remove the AC component cos (2ωt + (θ + φi)) from the output of the expression (1) generated from the corresponding multipliers 32-1 to 32-N, and the DC component. cos (θ−φi) is extracted and output as output values 1 to N, respectively.

  The phase difference detection circuit 34 includes a maximum output value detection unit 34A and a phase difference calculation unit 34B. The maximum output value detection unit 34A intermittently determines which output value is the maximum among the output values 1 to N output from the low-pass filters 33-1 to 33-N of the low-pass filter group 33, respectively. Detected whenever signal portions A, B, and C (shown in FIG. 2) are input. Here, since the output i becomes maximum when φi = θ, the phase φi of the internal carrier wave that becomes the maximum output becomes the phase of the received ATC signal. Therefore, each time the output value indicating the maximum value of each signal portion A, B, C detected by the maximum output value detector 34A is input, the phase difference calculator 34B receives the internal carrier wave corresponding to the input maximum output value. For example, when φi, φj, and φk in FIG. 4 are used, the phases φi, φj, and φk of the internal carrier wave are stored as the phases of the received ATC signals in the signal portions A, B, and C, respectively. Based on the phases φi, φj, φk of the internal carrier, the phase shift amounts (phase differences) φi−φj, φj−φk between the adjacent signal portions A and B, B and C are calculated. Thus, the relative phase difference of the carrier waves between the adjacent signal portions A and B and B and C is detected, and the detected phase difference is output to the sub information receiving unit 13 as phase information. Here, the phase difference detection circuit 34 corresponds to a phase difference detection means.

Next, operation | movement of the phase detection circuit 30 in the train control apparatus of this embodiment is demonstrated.
When an amplitude-modulated signal as shown in FIG. 2 is input to the phase detection circuit 30 via the amplifier circuit 11 and received by the power receiver 10, the digital signals sampled by the A / D converter 31 at a predetermined interval are used as a multiplier group. The data are input in parallel to the 32 multipliers 32-1 to 32-N. Each multiplier 32-1 to 32-N multiplies the input digital signal (carrier wave waveform data of the amplitude modulation signal) by each internal carrier sin (ωt + φi) (i = 0 to (N−1)). The multiplication results of the multipliers 32-1 to 32-N are input to the corresponding low-pass filters 33-1 to 33-N of the low-pass filter group 33, and a DC component is obtained from each of the low-pass filters 33-1 to 33-N. The extracted DC component is input to the maximum output value detection unit 34A of the phase difference detection circuit 34 as each output value 1 to N. Note that the multiplication operation and the extraction operation of the multiplier group 32 and the low-pass filter group 33 are performed continuously regardless of the presence or absence of the signal portion in the amplitude modulation signal shown in FIG. The output result is not adopted by recognizing it as a space portion.

  When the digital signal of the signal portion A of the amplitude modulation signal shown in FIG. 2 is input to the phase difference detection circuit 34 via the multiplier group 32 and the low-pass filter group 33, the maximum output value detection unit 34 detects the detected maximum output. The phase φi of the internal carrier that generated the value is stored as the phase of the received digital signal in signal portion A. That is, as is clear from the equation (1), the maximum output among the outputs 1 to N output from the low-pass filters 33-1 to 33-N is when φi = θ, and the maximum output value is The phase of the internal carrier wave corresponding to the output shown is synchronized with the phase of the received ATC signal, and the phase of this internal carrier wave is the phase of the received ATC signal. Store as the phase of the digital signal. This operation is executed for each period of the carrier wave in the signal portion A, and it is confirmed that the phase of the internal carrier wave that is the maximum output value is the same. Confirm that it is a sync point. This confirmation operation is not necessarily performed.

  When the signal portion A ends and the carrier wave data of the next signal portion B is input to the phase detection circuit 30, the maximum output value of the signal portion B is detected and corresponding to this maximum output value, as in the case of the signal portion A described above. Is stored as the phase of the received digital signal in the signal portion B. Then, the phase difference calculation unit 34B calculates the phase difference φij (φij = φi−φj) between the phase φi stored for the signal portion A and the phase φj stored for the signal portion B. Here, the phase of the internal carrier wave that is the maximum output value of the signal portion B is shifted from the carrier wave of the signal portion A by a phase difference corresponding to the added sub-information.

  When the signal portion B ends and the carrier wave data of the next signal portion C is input to the phase detection circuit 30, the same operation as in the signal portions A and B is repeated for the signal portion C to obtain the maximum output value in the signal portion C. The phase φk of the internal carrier wave corresponding to the maximum output value is detected and stored as the phase of the received digital signal in the signal portion C, and the phase φj and the signal portion C stored for the signal portion B are stored in the phase difference calculation unit 34B. The phase difference φjk (φjk = φj−φk) of the stored phase φk is calculated. When the relative phase difference between the adjacent signal parts that have been confirmed is matched continuously a predetermined number of times, for example, when they are matched twice consecutively, in the case of this embodiment, the phase difference calculation unit 33B When the relative phase difference φij between A and B matches the relative phase difference φjk between the signal parts B and C, the relative phase difference (+ (π / 2) in FIG. 2) is determined as phase information. To the sub information receiving unit 13. It should be noted that the number of consecutive matches when phase information is determined is not limited to two, and an appropriate number of consecutive three or more may be set within a range that does not affect the response of train control.

  As a method for determining the phase information, a relative phase difference of a carrier wave between adjacent signal portions is detected between a plurality (for example, 10) of adjacent signal portions, and among these plurality (for example, 10), When not less than a predetermined number (for example, 5) is matched, the matched relative phase difference may be determined as phase information. Also in this case, the number of adjacent signal portions for detecting the relative phase difference of the carrier waves is not limited to 10, and an appropriate number may be set within a range that does not hinder the response of the train control.

  According to the train control apparatus of the present embodiment, the relative phase difference between the carrier wave and the basic carrier wave of each signal portion where the amplitude modulation signal is intermittent is detected using the multiplier group 32 and the low-pass filter group 33, and the detected relative Since the phase information is extracted based on the target phase difference, it is not necessary to acquire or hold the synchronization with respect to the input signal as compared with the case of using the conventional PLL circuit, and the carrier phase change detection process can be easily performed. Further, since the phase information is acquired using the maximum output value detected using the multiplier group 32 and the low-pass filter group 33, the train A entering the track circuit T is directed from the receiving end of the ATC signal toward the transmitting end side. As it progresses, even if the amplitude modulation signal level received by the power receiver 10 increases, there is an advantage that it is hardly affected by the change in the amplitude modulation signal level.

  The above-described embodiment is a train control device configured to also correspond to the train control information with the modulation wave frequency of amplitude modulation, but is configured to correspond only to the phase change due to phase modulation with the modulation wave frequency being constant. May be. Moreover, although the example of the ATC device was shown as the train control device, it can be applied to a train control device such as an ATS device that communicates information related to train control between the ground side and the vehicle upper side. Needless to say.

  In the above embodiment, the ground device that performs amplitude modulation processing on the phase modulation signal of the phase modulation means for changing the basic carrier wave to the phase corresponding to the train control information, and transmits the phase of the carrier wave in the received amplitude modulation signal. The on-board device having the train control means for extracting the train control information from the phase information output from the phase detection means to detect and controlling the train, but is not limited to this configuration, the present invention is , A device on the transmitting side that transmits a signal in which the phase of the basic carrier wave is changed corresponding to the train control information, and a signal transmitted from the device on the transmitting side is received and the phase of the received signal is detected and detected. In a train control device comprising a receiving side device for controlling the train by extracting train control information from the phase information obtained, the received signal is shifted in phase by a constant value at the same amplitude and frequency as the basic carrier wave. The inside carrier multiplied respectively, based on the phase information of the internal carrier substantially coincides with the received signal in the multiplication result may be a configuration which outputs the phase information of the received signal.

DESCRIPTION OF SYMBOLS 1 Carrier wave generation circuit 2 Modulation circuit 4 Phase shift circuit 12 Main information receiving part 13 Sub information receiving part 15 1st main information receiving relay 17 2nd main information receiving relay 18 1st sub information receiving relay 19 2nd sub information receiving relay 20 Third sub information reception relay 30 Phase detection circuit 31 A / D converter 32 Multiplier group 33 Low pass filter group 34 Phase difference detection circuit A Train a Ground device b On-vehicle device

Claims (7)

A device that transmits a signal in which the phase of the basic carrier wave is changed corresponding to the train control information, and the signal transmitted from the device is received to detect the phase of the signal, and the train control is detected from the detected phase information. In a train control device comprising a device for extracting information and controlling a train,
The received signal is multiplied by an internal carrier whose phase is shifted by a constant value at the same amplitude and frequency as the basic carrier, and the reception is performed based on the phase information of the internal carrier that substantially matches the received signal in the multiplication result. A train control device characterized in that it is configured to output phase information of the signal.   Based on the multiplication result, as the phase information of the internal carrier, the phase of the internal carrier that substantially matches the phase of the received signal is detected for each intermittent signal portion of the received signal, and each phase of the detected internal carrier is detected. The train control device according to claim 1, wherein a relative phase difference of internal carrier waves between the signal portions adjacent to each other is detected and phase information of the received signal is output. A ground device that performs amplitude modulation processing on the phase modulation signal of the phase modulation means for changing the basic carrier wave to a phase corresponding to the train control information and transmits it, and an output of the phase detection means that detects the phase of the carrier wave in the received amplitude modulation signal In a train control device comprising an on-board device having train control means for controlling the train by extracting the train control information from the phase information to be
The phase detection unit multiplies the amplitude modulation signal by a plurality of internal carriers each having a phase shifted by a constant value at the same amplitude and frequency as the basic carrier, and based on the multiplication result, the amplitude modulation signal is intermittently generated. Detecting a phase of an internal carrier that substantially matches a carrier phase of an amplitude-modulated signal for each signal portion to be detected, detecting a relative phase difference of the internal carrier between the adjacent signal portions, and outputting the phase information A train control device characterized by that. The phase detection means includes
N multipliers for multiplying each of the N internal carriers whose phases and phases are shifted by 2π / N with the same amplitude and frequency as the basic carrier, and the amplitude-modulated signal;
N low-pass filters that extract a DC component from the output of each multiplier;
The internal carrier wave between the signal parts adjacent to each other is detected by detecting the phase of the internal carrier wave having the maximum low-pass filter output value for each intermittent signal part of the amplitude modulation signal as the phase substantially matching the carrier wave phase of the amplitude modulation signal. Phase difference detection means for detecting the relative phase difference of the output and outputting the phase information;
The train control device according to claim 3, comprising:   The phase difference detecting means is configured to output the phase information based on the matched relative phase difference when the detected relative phase difference of the carrier wave between the adjacent signal portions is continuously matched a predetermined number of times. The train control device according to claim 4 which is.   The phase difference detecting means detects the relative phase difference of the carrier wave between the detected adjacent signal portions a plurality of times, and when the predetermined relative number of times is matched from the plurality of times, the matched relative position is detected. The train control device according to claim 4, wherein the train control device is configured to output the phase information based on a phase difference.   The train control device according to any one of claims 3 to 6, wherein in the amplitude modulation processing, a change in frequency of a modulated wave that modulates a carrier wave is associated with train control information different from the train control information. .