JP2015036249A - Train control system - Google Patents

Train control system Download PDF

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JP2015036249A
JP2015036249A JP2013167162A JP2013167162A JP2015036249A JP 2015036249 A JP2015036249 A JP 2015036249A JP 2013167162 A JP2013167162 A JP 2013167162A JP 2013167162 A JP2013167162 A JP 2013167162A JP 2015036249 A JP2015036249 A JP 2015036249A
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amplitude
train control
phase
modulated wave
modulated
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JP6157984B2 (en
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顕夫 岩上
Akio Iwagami
顕夫 岩上
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Nippon Signal Co Ltd
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Nippon Signal Co Ltd
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Priority to KR1020167006077A priority patent/KR102039565B1/en
Priority to PCT/JP2014/071100 priority patent/WO2015020214A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/40—Adaptation of control equipment on vehicle for remote actuation from a stationary place
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning, or like safety means along the route or between vehicles or vehicle trains
    • B61L23/08—Control, warning, or like safety means along the route or between vehicles or vehicle trains for controlling traffic in one direction only
    • B61L23/14—Control, warning, or like safety means along the route or between vehicles or vehicle trains for controlling traffic in one direction only automatically operated
    • B61L23/16—Track circuits specially adapted for section blocking
    • B61L23/168—Track circuits specially adapted for section blocking using coded current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/221—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using track circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2331—Demodulator circuits; Receiver circuits using non-coherent demodulation wherein the received signal is demodulated using one or more delayed versions of itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/12—Speed

Abstract

PROBLEM TO BE SOLVED: To provide a train control system capable of properly detecting a phase of an amplitude modulation wave without increasing a sampling frequency.SOLUTION: A train control system comprises: a ground device 1 for transmitting a predetermined train control signal; and an on-vehicle device 3 for receiving the train control signal transmitted from the ground device 1 and controlling a train 2. The ground device 1 performs phase modulation of an amplitude modulation wave constituting the train control signal at a predetermined period of time to transmit the modulated amplitude modulation wave to the on-vehicle device 3.

Description

本発明は列車制御システムに係り、特に、サンプリング周波数を高めることなく、振幅変調波の位相を正しく検出することを可能とした列車制御システムに関する。   The present invention relates to a train control system, and more particularly to a train control system that can correctly detect the phase of an amplitude-modulated wave without increasing the sampling frequency.

従来から、ＡＴＣに係る列車制御システムにおいて、地上側に設けられる地上装置と、列車側に搭載される車上装置とから構成され、地上装置から列車に向けて所定の列車制御信号を送信し、送信された列車制御信号を車上装置で受信して速度制御等の所定の列車制御を行うように構成されている。   Conventionally, in a train control system according to ATC, it is composed of a ground device provided on the ground side and an on-board device mounted on the train side, and transmits a predetermined train control signal from the ground device to the train, The transmitted train control signal is received by the on-board device, and predetermined train control such as speed control is performed.

そして、近年、アナログＡＴＣ信号（振幅変調波）に位相変調を加え、従来のＡＴＣ信号と互換性を保ちながら情報量を増やすようにしたｅ−ＡＴＣと呼ばれるＡＴＣシステムが開発されている。そして、このｅ-ＡＴＣにおいては、振幅変調波の各信号部間の位相差が情報として送られるものであるため、ＡＴＣ受信部において信号の位相差を復調する際に、信号部と無信号部とを正しく判別する必要がある。   In recent years, an ATC system called e-ATC has been developed in which phase modulation is applied to an analog ATC signal (amplitude modulated wave) to increase the amount of information while maintaining compatibility with a conventional ATC signal. In this e-ATC, the phase difference between the signal parts of the amplitude-modulated wave is transmitted as information. Therefore, when demodulating the phase difference of the signal in the ATC receiver, the signal part and the non-signal part It is necessary to determine correctly.

このような信号部と無信号部とを正しく判別する手段として、従来、例えば、第１の情報に応じて第１の符号化を行い、区間内に極性反転を持つ平衡符号を出力する第１の符号化手段と、当該平衡符号に応じて搬送波を変調する第１の変調手段と、第２の情報に応じて第２の符号化を行い、所定方式の第２の符号を出力する第２の符号化手段と、当該第２の符号に応じて搬送波を変調する第２の変調手段とを備えた技術が開示されている（例えば、特許文献１を参照。）。   As means for correctly discriminating between such a signal part and no-signal part, conventionally, for example, a first encoding is performed according to first information and a balanced code having polarity inversion in a section is output. Encoding means, a first modulating means for modulating the carrier wave in accordance with the balanced code, a second encoding means for performing second encoding in accordance with the second information, and outputting a second code of a predetermined method Has been disclosed (see, for example, Patent Document 1). The technique includes a second encoding unit that modulates a carrier wave in accordance with the second code.

特開２００１−０２４７１８号公報JP 2001-024718 A

しかしながら、前記従来の技術においては、計測した振幅変動または位相誤差を用いて周波数領域の信号に含まれる非希望信号を補正し、非希望信号が抑制された受信信号を増幅することにより、信号の受信を行うことができるものであるが、ｅ−ＡＴＣにおいて、位相検出結果の精度を高めるためには、サンプリング周波数を高くしなければならず、サンプリング周波数を低くすると振幅変調波の位相検出の誤差が大きくなってしまうという問題がある。そのため、従来のように非希望信号を抑制するだけでは、サンプリング周波数が低い場合に、ｅ-ＡＴＣにおける振幅変調波の位相を正しく検出することができないという問題を有している。   However, in the above-described conventional technique, the undesired signal included in the frequency domain signal is corrected using the measured amplitude fluctuation or phase error, and the received signal in which the undesired signal is suppressed is amplified. In e-ATC, in order to increase the accuracy of the phase detection result, it is necessary to increase the sampling frequency. If the sampling frequency is decreased, the phase detection error of the amplitude-modulated wave is reduced. There is a problem that becomes large. For this reason, there is a problem that the phase of the amplitude-modulated wave in the e-ATC cannot be detected correctly only by suppressing the undesired signal as in the conventional case when the sampling frequency is low.

本発明は前記した点に鑑みてなされたものであり、サンプリング周波数を高めることなく、振幅変調波の位相を正しく検出することのできる列車制御システムを提供することを目的とするものである。   The present invention has been made in view of the above points, and an object of the present invention is to provide a train control system that can correctly detect the phase of an amplitude-modulated wave without increasing the sampling frequency.

本発明は前記目的を達成するために、請求項１の発明に係る列車制御システムは、所定の列車制御信号を送信する地上装置と、
前記地上装置から送信された列車制御信号を受信して列車の制御を行う車上装置と、を備え、
前記地上装置は、前記列車制御信号を構成する振幅変調波を所定時間間隔で位相変調して前記車上装置に送信することを特徴とする。 In order to achieve the above object, the train control system according to the invention of claim 1 includes a ground device that transmits a predetermined train control signal,
An on-board device that receives the train control signal transmitted from the ground device and controls the train, and
The ground device is characterized in that an amplitude-modulated wave constituting the train control signal is phase-modulated at a predetermined time interval and transmitted to the on-vehicle device.

請求項２に係る発明は、請求項１において、前記車上装置は、前記地上装置から位相変調して送られる振幅変調波を所定位相分遅延させる遅延回路と、前記地上装置から位相変調して送られる振幅変調波と前記遅延回路により遅延された信号とを乗算して振幅変調波の位相変化量を求める乗算回路と、を備えていることを特徴とする。   According to a second aspect of the present invention, in the first aspect, the on-board device performs a phase modulation from the ground device and a delay circuit that delays an amplitude-modulated wave transmitted by phase modulation from the ground device by a predetermined phase. And a multiplication circuit that multiplies the amplitude-modulated wave to be sent and the signal delayed by the delay circuit to obtain the phase change amount of the amplitude-modulated wave.

請求項３に係る発明は、請求項２において、前記車上装置は、前記乗算回路による波形から変調波周波数成分を除去して直流成分を抽出して振幅変調波の位相変化量を求めるフィルタ回路をさらに備えていることを特徴とする。   The invention according to claim 3 is the filter circuit according to claim 2, wherein the on-board device obtains a phase change amount of the amplitude modulation wave by removing the modulation wave frequency component from the waveform of the multiplication circuit and extracting a DC component. Is further provided.

請求項４に係る発明は、請求項２または請求項３において、前記車上装置は、前記地上装置から位相変調して送られる振幅変調波を１サンプル分遅延させる他の遅延回路をさらに備え、前記遅延回路による波形と、前記他の遅延回路による波形とに基づいて振幅変調波の位相変化量を求めることを特徴とする。   According to a fourth aspect of the present invention, in the second or third aspect, the on-board device further includes another delay circuit that delays an amplitude-modulated wave transmitted by phase modulation from the ground device by one sample, The phase change amount of the amplitude-modulated wave is obtained based on the waveform by the delay circuit and the waveform by the other delay circuit.

請求項５に係る発明は、請求項２または請求項３において、前記車上装置は、前記地上装置から位相変調して送られる振幅変調波をヒルベルト変換により遅延させる波形を生成し、元の振幅変調波の波形と前記遅延された波形とに基づいて振幅変調波の位相変化量を求めることを特徴とする。   According to a fifth aspect of the present invention, in the second or third aspect, the on-board device generates a waveform that delays an amplitude-modulated wave transmitted by phase modulation from the ground device by Hilbert transform, and the original amplitude A phase change amount of the amplitude modulation wave is obtained based on the waveform of the modulation wave and the delayed waveform.

請求項１に係る発明によれば、地上装置により、列車制御信号を構成する振幅変調波を所定時間間隔で位相変調して車上装置に送信するようにしているので、振幅変調波のサンプリング周波数を高めることなく、振幅変調波の位相を正確に検出することができ、この振幅変調波の位相差に基づいて列車の制御情報を得ることができる。   According to the first aspect of the invention, the amplitude modulation wave constituting the train control signal is phase-modulated at a predetermined time interval and transmitted to the on-board device by the ground device. Therefore, the phase of the amplitude-modulated wave can be detected accurately, and train control information can be obtained based on the phase difference of the amplitude-modulated wave.

請求項２に係る発明によれば、車上装置に、地上装置から位相変調して送られる振幅変調波を所定位相分遅延させる遅延回路と、地上装置から位相変調して送られる振幅変調波と遅延回路により遅延された信号とを乗算して振幅変調波の位相変化量を求める乗算回路とを設けるようにしているので、この乗算回路により、振幅変調波と遅延回路により遅延された振幅変調波とを乗算することにより、振幅変調波から直流成分を抽出して振幅変調波の位相差を判定することができ、振幅変調波のサンプリング周波数を高めることなく、振幅変調波の位相を正確に検出することができ、この振幅変調波の位相差に基づいて列車の制御情報を得ることができる。   According to the invention of claim 2, the delay circuit that delays the amplitude-modulated wave that is phase-modulated and transmitted from the ground device to the on-board device by a predetermined phase, and the amplitude-modulated wave that is phase-modulated and transmitted from the ground device Since there is provided a multiplication circuit that multiplies the signal delayed by the delay circuit to obtain the phase change amount of the amplitude modulation wave, the amplitude modulation wave delayed by the delay circuit by the multiplication circuit is provided by this multiplication circuit. To extract the DC component from the amplitude-modulated wave and determine the phase difference between the amplitude-modulated wave and accurately detect the phase of the amplitude-modulated wave without increasing the sampling frequency of the amplitude-modulated wave The train control information can be obtained based on the phase difference of the amplitude-modulated wave.

請求項３に係る発明によれば、車上装置に、乗算回路による波形から変調波周波数成分を除去して直流成分を抽出して振幅変調波の位相変化量を求めるフィルタ回路を設けるようにしているので、このフィルタ回路により、乗算後の振幅変調波から直流成分を抽出することにより、振幅変調波の位相差を判定するようにしているので、振幅変調波のサンプリング周波数を高めることなく、振幅変調波の位相を正確に検出することができ、この振幅変調波の位相差に基づいて列車の制御情報を得ることができる。   According to the invention of claim 3, the on-board device is provided with a filter circuit that removes the modulation wave frequency component from the waveform of the multiplication circuit and extracts the DC component to obtain the phase change amount of the amplitude modulation wave. Therefore, this filter circuit extracts the direct current component from the multiplied amplitude modulated wave to determine the phase difference of the amplitude modulated wave, so that the amplitude without increasing the sampling frequency of the amplitude modulated wave. The phase of the modulated wave can be detected accurately, and train control information can be obtained based on the phase difference of the amplitude modulated wave.

請求項４に係る発明によれば、車上装置に、地上装置から位相変調して送られる振幅変調波を１サンプル分遅延させる他の遅延回路を設け、遅延回路による波形と、他の遅延回路による波形とに基づいて振幅変調波の位相変化量を求めるようにしているので、遅延回路による波形と、他の遅延回路による波形とから２種類の位相成分を抽出することができ、これらの値から位相変化量のｃｏｓ成分、ｓｉｎ成分を求め、逆ｔａｎ関数を用いることによりで位相変化量を求めることが可能となる。   According to the invention of claim 4, the on-board device is provided with another delay circuit that delays the amplitude-modulated wave that is phase-modulated and transmitted from the ground device by one sample, the waveform by the delay circuit, and the other delay circuit Since the phase change amount of the amplitude-modulated wave is obtained based on the waveform obtained from the above, two types of phase components can be extracted from the waveform produced by the delay circuit and the waveform produced by another delay circuit. From this, the cos component and sin component of the phase change amount are obtained, and the phase change amount can be obtained by using the inverse tan function.

請求項５に係る発明によれば、車上装置に、地上装置から位相変調して送られる振幅変調波をヒルベルト変換により遅延させる波形を生成し、元の振幅変調波の波形と遅延された波形とに基づいて振幅変調波の位相変化量を求めるようにしているので、ヒルベルト変換処理を用いることにより、入力信号の位相をπ／２遅らせた信号を生成することができ、振幅変調波をｃｏｓ成分、ヒルベルト変換処理により生成された信号をｓｉｎ成分として、逆ｔａｎ関数を用いることで位相変化量を求めることが可能となる。   According to the invention of claim 5, a waveform that delays the amplitude-modulated wave that is phase-modulated and sent from the ground device to the on-board device by the Hilbert transform is generated, and the waveform of the original amplitude-modulated wave and the delayed waveform are generated. Since the phase change amount of the amplitude-modulated wave is obtained based on the above, a signal in which the phase of the input signal is delayed by π / 2 can be generated by using the Hilbert transform process, and the amplitude-modulated wave is cos. Using the inverse tan function with the signal generated by the component and Hilbert transform processing as the sin component, the phase change amount can be obtained.

本発明に係る列車制御システムの実施形態を示す概略構成図である。It is a schematic structure figure showing an embodiment of a train control system concerning the present invention. 本発明に係る列車制御システムの実施形態における車上装置の位相検出処理部を示す概略構成図である。It is a schematic block diagram which shows the phase detection process part of the on-board apparatus in embodiment of the train control system which concerns on this invention. 本発明に係る列車制御システムの実施形態における振幅変調波の例を示す説明図である。It is explanatory drawing which shows the example of the amplitude modulation wave in embodiment of the train control system which concerns on this invention. 本発明に係る列車制御システムの実施形態における振幅変調波と遅延した振幅変調波の例を示す説明図である。It is explanatory drawing which shows the example of the amplitude modulation wave and delayed amplitude modulation wave in embodiment of the train control system which concerns on this invention. 本発明に係る列車制御システムの実施形態における乗算回路により乗算した結果の例を示す説明図である。It is explanatory drawing which shows the example of the result multiplied by the multiplication circuit in embodiment of the train control system which concerns on this invention. 本発明に係る列車制御システムの実施形態におけるローパスフィルタにより処理した結果の例を示す説明図である。It is explanatory drawing which shows the example of the result processed by the low-pass filter in embodiment of the train control system which concerns on this invention.

以下、本発明の実施形態について図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明に係る列車制御システムの実施形態を示す概略構成図であり、図１において、本実施形態の列車制御システムは、地上側に設けられている地上装置１と、列車２に搭載した車上装置３と、を備えて構成されている。そして、地上装置１から、例えば、列車２の許容速度情報などの列車制御情報に対応させた列車制御信号を、図中右方向に進行している列車２が在線する軌道回路Ｔのレールの図中右端側から送信し、この列車制御信号を車上装置３が受信すると、列車制御信号から列車制御情報を抽出し、抽出した列車制御情報に基づいて列車２の走行を制御するよう構成されている。軌道回路は、レールにより形成されていて、前後の軌道回路Ｔ′，Ｔ″を形成するレールとは、交流信号に対してそれぞれ電気的絶縁が図られている。   FIG. 1 is a schematic configuration diagram illustrating an embodiment of a train control system according to the present invention. In FIG. 1, the train control system of the present embodiment includes a ground device 1 and a train 2 provided on the ground side. And an on-vehicle device 3 mounted thereon. And the figure of the rail of the track circuit T in which the train 2 traveling in the right direction in the figure shows a train control signal corresponding to the train control information such as the allowable speed information of the train 2 from the ground device 1. When the on-board device 3 receives the train control signal transmitted from the middle right end side, the train control information is extracted from the train control signal, and the traveling of the train 2 is controlled based on the extracted train control information. Yes. The track circuit 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.

また、地上装置１は、所定の周波数を有する基本搬送波を振幅変調処理して変調波を生成し、所定の列車制御情報を示す列車制御信号を形成するように構成されている。そして、このように、振幅変調処理された列車制御信号は、増幅処理されて軌道回路Ｔを形成するレールに供給されるように構成されている。なお、このような地上装置１は、隣接する軌道回路Ｔ′，Ｔ″にもそれぞれ設けられているが、ここでは省略する。   The ground device 1 is configured to generate a modulated wave by performing amplitude modulation processing on a basic carrier wave having a predetermined frequency to form a train control signal indicating predetermined train control information. Thus, the train control signal subjected to the amplitude modulation processing is configured to be amplified and supplied to the rails forming the track circuit T. Such a ground device 1 is also provided in each adjacent track circuit T ′, T ″, but is omitted here.

次に、車上装置３について説明する。   Next, the on-board device 3 will be described.

図２に示すように、車上装置３には、列車２の前部においてレールに対向して設けられ地上装置１からレールに送信された列車制御信号を受電器４により受信して送られるように構成されている。また、車上装置３は、受電器４からの信号を受信する受信部、論理部、モニタ部など（いずれも図示せず）、各種装置を備えており、受信部は、位相検出処理部を備えている。図２は、この位相検出処理部の詳細を示したものであり、図２に示すように、位相検出処理部は、バンドパスフィルタ５と、乗算回路６と、遅延回路７と、フィルタ回路としてのローパスフィルタ８と、位相変化量算出回路９とをそれぞれ備えている。   As shown in FIG. 2, the on-board device 3 receives a train control signal that is provided facing the rail at the front of the train 2 and is transmitted from the ground device 1 to the rail so as to be received by the power receiver 4. It is configured. The on-board device 3 includes various devices such as a receiving unit that receives a signal from the power receiver 4, a logic unit, and a monitor unit (none of which are shown). The receiving unit includes a phase detection processing unit. I have. FIG. 2 shows details of the phase detection processing unit. As shown in FIG. 2, the phase detection processing unit includes a bandpass filter 5, a multiplication circuit 6, a delay circuit 7, and a filter circuit. The low-pass filter 8 and the phase change amount calculation circuit 9 are provided.

ここで、列車制御信号は、図３に示すように、振幅に周期性を持たせた振幅変調波であり、信号部と無信号部とから構成されている。そして、振幅の信号部と、次の信号部との位相を、例えば、９０°ずつずらして送信することにより、この振幅の位相差を情報として送ることができるようになっている。そして、本実施形態においては、地上装置１により、振幅変調波を、その変調波周波数にかかわらず、一定時間ごとのタイミングで位相変調し、このように位相変調された振幅変調波を車上装置３に送信するように構成されている。なお、この位相変調する一定の時間は、任意に設定することができるものである。   Here, as shown in FIG. 3, the train control signal is an amplitude-modulated wave having a periodicity in amplitude, and is composed of a signal portion and a non-signal portion. Then, the phase difference between the amplitude signal portion and the next signal portion is transmitted by shifting by 90 °, for example, so that the phase difference of the amplitude can be transmitted as information. In the present embodiment, the ground device 1 modulates the phase of the amplitude-modulated wave at a fixed time interval regardless of the modulation wave frequency, and the amplitude-modulated wave thus phase-modulated is mounted on the vehicle. 3 to transmit to. The fixed time for phase modulation can be set arbitrarily.

バンドパスフィルタ５は、列車制御信号の振幅変調波の周波数帯域外のノイズを除去するものである。また、図４に示すように、遅延回路７は、バンドパスフィルタ５から出力される振幅変調波を、例えば、地上装置１により位相変調される時間など、所定の時間だけ遅延させるように構成されている。また、図５に示すように、乗算回路６は、バンドパスフィルタ５から出力される振幅変調波と、遅延回路７から出力される振幅変調波とを乗算することにより、振幅変調波の位相差に応じた直流成分をもった正弦波を得るように構成されている。   The band pass filter 5 removes noise outside the frequency band of the amplitude modulated wave of the train control signal. Further, as shown in FIG. 4, the delay circuit 7 is configured to delay the amplitude-modulated wave output from the bandpass filter 5 by a predetermined time such as a time during which the phase modulation is performed by the ground device 1. ing. Further, as shown in FIG. 5, the multiplication circuit 6 multiplies the amplitude modulation wave output from the bandpass filter 5 and the amplitude modulation wave output from the delay circuit 7 to thereby obtain a phase difference between the amplitude modulation waves. It is configured to obtain a sine wave having a direct current component corresponding to.

ローパスフィルタ８は、図６に示すように、乗算後の振幅変調波から、搬送波、変調波周波数成分を除去し直流成分を抽出するように構成されている。そして、直流成分は、振幅変調波の位相差に比例するものであるから、位相変化量算出回路９は、この直流成分に基づいて、振幅変調波の位相差を判定することができ、この位相差から列車制御情報を得るようになっている。なお、位相変調を行うタイミングによっては、すべての区間が無信号部となる場合もあるが、前述の処理を行うことにより、問題なく列車制御情報を得ることができる。   As shown in FIG. 6, the low-pass filter 8 is configured to remove a carrier wave and a modulated wave frequency component and extract a DC component from the multiplied amplitude modulated wave. Since the direct current component is proportional to the phase difference of the amplitude modulated wave, the phase change amount calculation circuit 9 can determine the phase difference of the amplitude modulated wave based on the direct current component. Train control information is obtained from the phase difference. Depending on the timing of phase modulation, all sections may be no-signal parts, but train control information can be obtained without any problems by performing the above-described processing.

次に、本実施形態の動作について説明する。   Next, the operation of this embodiment will be described.

地上装置１からレールに送信された列車制御信号を受電器４により受信したら、車上装置３のバンドパスフィルタ５により、列車制御信号の周波数帯域外のノイズを除去し、乗算回路６および遅延回路７に送るようになっている。   When the train control signal transmitted from the ground device 1 to the rail is received by the power receiver 4, the noise outside the frequency band of the train control signal is removed by the bandpass filter 5 of the on-board device 3, and the multiplication circuit 6 and the delay circuit 7 to send.

そして、遅延回路７により、バンドパスフィルタ５から出力される振幅変調波を、所定の時間だけ遅延させ、乗算回路６により、バンドパスフィルタ５から出力される振幅変調波と、遅延回路７から出力される振幅変調波とを乗算することにより、振幅変調波の位相差に応じた直流成分をもった正弦波を得る。   Then, the amplitude modulation wave output from the bandpass filter 5 is delayed by a predetermined time by the delay circuit 7, and the amplitude modulation wave output from the bandpass filter 5 by the multiplication circuit 6 and output from the delay circuit 7. A sine wave having a DC component corresponding to the phase difference of the amplitude modulated wave is obtained by multiplying the amplitude modulated wave.

そして、ローパスフィルタ８により、乗算後の振幅変調波から、搬送波、変調波周波数成分を除去し直流成分を抽出し、この直流成分に基づいて、振幅変調波の位相差を判定して、この位相差から列車制御情報を得るようになっている。   Then, the low-pass filter 8 removes the carrier wave and the modulated wave frequency component from the multiplied amplitude modulated wave to extract the DC component, and determines the phase difference of the amplitude modulated wave based on this DC component. Train control information is obtained from the phase difference.

以上述べたように、本実施形態においては、地上装置１により、振幅変調波をその変調波周波数にかかわらず、一定時間ごとのタイミングで位相変調して車上装置３に送信し、車上装置３の乗算回路６により、振幅変調波と遅延回路７により遅延された振幅変調波とを乗算して、ローパスフィルタ８により、乗算後の振幅変調波から直流成分を抽出することにより、振幅変調波の位相差を判定するようにしているので、振幅変調波のサンプリング周波数を高めることなく、振幅変調波の位相を正確に検出することができ、この振幅変調波の位相差に基づいて列車２の制御情報を得ることができる。   As described above, in the present embodiment, the ground device 1 modulates the phase of the amplitude-modulated wave at a certain time interval regardless of the modulation wave frequency, and transmits it to the on-vehicle device 3. 3 is multiplied by the amplitude-modulated wave and the amplitude-modulated wave delayed by the delay circuit 7, and the low-pass filter 8 extracts a direct current component from the multiplied amplitude-modulated wave. Therefore, the phase of the amplitude-modulated wave can be accurately detected without increasing the sampling frequency of the amplitude-modulated wave, and the train 2 can be detected based on the phase difference of the amplitude-modulated wave. Control information can be obtained.

なお、位相変化量を求める他の手段として、地上装置１から位相変調して送られる振幅変調波を１サンプル分遅延させる他の遅延回路（図示せず）を設け、遅延回路７による振幅変調波の波形と、他の遅延回路による振幅変調波の波形とに基づいて振幅変調波の位相変化量を求めるようにしてもよい。すなわち、遅延回路７による遅延量をｄとした場合に、遅延ｄの乗算処理およびローパスフィルタ８の処理結果と合わせて、他の遅延回路による１サンプル分遅延された遅延量ｄ−１の乗算処理およびローパスフィルタ８の処理結果を用いることで、２種類の位相成分を抽出することができ、これらの値から位相変化量のｃｏｓ成分、ｓｉｎ成分を求め、逆ｔａｎ関数を用いることによりで位相変化量を求めることが可能となる。   As another means for obtaining the amount of phase change, another delay circuit (not shown) for delaying the amplitude-modulated wave transmitted by phase modulation from the ground device 1 by one sample is provided, and the amplitude-modulated wave by the delay circuit 7 is provided. The phase change amount of the amplitude-modulated wave may be obtained based on the above waveform and the waveform of the amplitude-modulated wave by another delay circuit. That is, when the delay amount by the delay circuit 7 is set to d, the delay d 1 multiplied by the delay amount d-1 by another delay circuit together with the delay d multiplication process and the processing result of the low-pass filter 8 are combined. By using the processing result of the low-pass filter 8 and two types of phase components can be extracted. From these values, the cos component and the sin component of the phase change amount are obtained, and the phase change is obtained by using the inverse tan function. The amount can be determined.

また、位相変化量を求めるさらに他の手段として、位相変化量検出回路９を用いて、ヒルベルト変換により、ＦＩＲ（有限インパルス応答）フィルタを通る振幅変調波の波形と、遅延させる波形に分け、ＦＩＲフィルタを通過した波形をｓｉｎ成分、遅延させた波形をｃｏｓ成分として逆ｔａｎ関数により位相変化量を求めるようにしてもよい。すなわち、ヒルベルト変換処理を用いることにより、入力信号の位相をπ／２遅らせた信号を生成することができ、位相変化量を求めることが可能となる。   Further, as yet another means for obtaining the phase change amount, the phase change amount detection circuit 9 is used to divide the waveform of the amplitude modulation wave passing through the FIR (finite impulse response) filter and the waveform to be delayed by the Hilbert transform. The phase change amount may be obtained by an inverse tan function with the waveform passing through the filter as the sin component and the delayed waveform as the cos component. That is, by using the Hilbert transform process, a signal obtained by delaying the phase of the input signal by π / 2 can be generated, and the phase change amount can be obtained.

なお、本発明は前記実施形態に限定されるものではなく、本発明の趣旨に基づいて種々の変形が可能である。   In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible based on the meaning of this invention.

１ 地上装置
２ 列車
３ 車上装置
４ 受電器
５ バンドパスフィルタ
６ 乗算回路
７ 遅延回路
８ ローパスフィルタ
９ 位相変化量算出回路９ DESCRIPTION OF SYMBOLS 1 Ground apparatus 2 Train 3 On-board apparatus 4 Power receiver 5 Band pass filter 6 Multiplication circuit 7 Delay circuit 8 Low pass filter 9 Phase variation calculation circuit 9

Claims (5)

所定の列車制御信号を送信する地上装置と、
前記地上装置から送信された列車制御信号を受信して列車の制御を行う車上装置と、を備え、
前記地上装置は、前記列車制御信号を構成する振幅変調波を所定時間間隔で位相変調して前記車上装置に送信することを特徴とする列車制御システム。 A ground device for transmitting a predetermined train control signal;
An on-board device that receives the train control signal transmitted from the ground device and controls the train, and
The above-mentioned ground device phase-modulates an amplitude modulation wave which constitutes the above-mentioned train control signal at predetermined time intervals, and transmits it to the on-board device. 前記車上装置は、前記地上装置から位相変調して送られる振幅変調波を所定位相分遅延させる遅延回路と、前記地上装置から位相変調して送られる振幅変調波と前記遅延回路により遅延された信号とを乗算して振幅変調波の位相変化量を求める乗算回路と、を備えていることを特徴とする請求項１に記載の列車制御システム。   The on-board apparatus is delayed by a delay circuit that delays an amplitude-modulated wave that is phase-modulated and transmitted from the ground apparatus by a predetermined phase, and an amplitude-modulated wave that is phase-modulated and transmitted from the ground apparatus and the delay circuit. The train control system according to claim 1, further comprising: a multiplication circuit that multiplies the signal to obtain a phase change amount of the amplitude-modulated wave. 前記車上装置は、前記乗算回路による波形から変調波周波数成分を除去して直流成分を抽出して振幅変調波の位相変化量を求めるフィルタ回路をさらに備えていることを特徴とする請求項２に記載の列車制御システム。   3. The on-vehicle apparatus further includes a filter circuit that obtains a phase change amount of an amplitude modulation wave by removing a modulation wave frequency component from a waveform obtained by the multiplication circuit and extracting a DC component. The train control system described in. 前記車上装置は、前記地上装置から位相変調して送られる振幅変調波を１サンプル分遅延させる他の遅延回路をさらに備え、前記遅延回路による波形と、前記他の遅延回路による波形とに基づいて振幅変調波の位相変化量を求めることを特徴とする請求項２または請求項３に記載の列車制御システム。   The on-board device further includes another delay circuit that delays the amplitude-modulated wave that is phase-modulated and transmitted from the ground device by one sample, and is based on the waveform by the delay circuit and the waveform by the other delay circuit. The train control system according to claim 2 or 3, wherein a phase change amount of the amplitude-modulated wave is obtained. 前記車上装置は、前記地上装置から位相変調して送られる振幅変調波をヒルベルト変換により遅延させる波形を生成し、元の振幅変調波の波形と前記遅延された波形とに基づいて振幅変調波の位相変化量を求めることを特徴とする請求項２または請求項３に記載の列車制御システム。   The on-board device generates a waveform that delays the amplitude-modulated wave that is phase-modulated from the ground device by Hilbert transform, and the amplitude-modulated wave is based on the waveform of the original amplitude-modulated wave and the delayed waveform. 4. The train control system according to claim 2, wherein the phase change amount is calculated.
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