JP2018125700A - Control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control system capable of increasing the information amount furthermore, in control of ATC, and the like, where speed control information, and the like, are set by using variation of carrier phase difference.SOLUTION: The control system is configured by using the carrier phase difference among amplitude modulation waves M0-M4 based on the carrier of at least one frequency, and generating control information on the basis of multiple code strings depending on the combination of presence or absence (1 or 0) of more than one carrier phase difference. In the control system, type of information can be increased according to the number of bits of the code string, and the information amount to be transmitted can be increased.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control system, and in particular, a control system capable of increasing the amount of information in a train control device or the like that performs control by transmitting amplitude control information to a carrier wave and acquiring the control information by a receiving side device. About.

  As an example of the control system, an automatic train control device (hereinafter referred to as “ATC device”) will be described. In the ATC device, speed limit information (ATC signal) is transmitted from the ground device to the train onboard device via a rail or the like. An ATC signal is generally generated by modulating a carrier wave with a modulated wave assigned to speed limit information. The number of modulated waves corresponds to the number of speed limit information, but a large number cannot be used due to restrictions on the receiving circuit of the on-board device.

  As a technique for increasing the number of modulated waves, that is, a technique for increasing the number of information (for example, “speed limit information”, generally “control information”), in the case of a configuration using a carrier wave of one frequency, for example, amplitude There has been proposed a method in which a carrier phase difference between adjacent modulation wave periods in a modulated carrier wave is changed, and a change amount of the carrier phase difference is set as information. This technique is disclosed in Patent Document 1, for example. It should be noted that two different carrier frequencies are prepared, the two carrier frequencies are amplitude-modulated with the modulation signals assigned to the respective information, the reception side identifies each of the signals, and a large amount of information is obtained by combining the identified modulation signals. The method of obtaining is also used.

  The invention disclosed in Patent Document 1 relates to an ATC device. In this ATC device, the transmission-side ground device is provided with phase modulation processing means for modulating the phase of a carrier wave with a phase corresponding to predetermined sub-information. The on-board device on the receiving side is configured to detect a carrier wave phase by phase detection means, extract sub information, and control the train based on the sub information.

JP 2008-13043 A

In the invention of the ATC device disclosed in Patent Document 1, when information is given, the phase of a carrier wave is changed at a certain angular interval, and a phase difference between adjacent amplitude-modulated waves is detected on the receiving side. The phase difference is used as one piece of information. This content. This will be specifically described with reference to FIG. FIG. 5 shows, as an example, time-series arrangements M0 to M5 of amplitude modulated waves transmitted from the transmission side to the reception side. The six amplitude modulated waves M0 to M5 are shown with the same waveform for convenience of illustration, but actually, it is assumed that a constant phase difference θ is generated between two adjacent amplitude modulated waves. That is, with the first amplitude modulated wave M0 as a reference (0), the constant is constant between M0 and M1, between M1 and M2, between M2 and M3, between M3 and M4, and between M4 and M5. Changes are made with the phase difference θ. As a result, when the phase difference θ is the same, the phase differences of the amplitude modulated waves M1 to M5 with respect to the amplitude modulated wave M0 change to + θ, + 2θ, + 3θ, + 4θ, and + 5θ, respectively. The phase difference θ between two adjacent amplitude-modulated waves M _i and M _{i + 1} differs based on the control situation and is not necessarily the same. Thus, the phase difference θ between two adjacent amplitude modulation waves M _i and M _{i + 1} is usually a certain angle difference, for example, 0 ° (= θ1), 45 ° (= θ2), 90 It can be set as ° (= θ3), 135 ° (= θ4), 180 ° (= θ5). In this case, for example, control information is assigned to the phase difference θ1 with information on the train speed 50 km / h, the phase difference θ2 with information about the train speed 55 km / h, and the like. Thus, train control can be performed based on information on the phase difference θ between two adjacent amplitude-modulated waves M _i and M _{i + 1} .

  According to the control method of the conventional ATC device disclosed in Patent Document 1, the amount of information can be increased, but there is a problem that further information cannot be increased.

  In view of the above-described problems, an object of the present invention is to provide a control system that can further increase the amount of information by control of ATC or the like that sets speed control information or the like using a change amount of a carrier phase difference. is there.

  In order to achieve the above object, a control system according to the present invention is configured as follows.

  The first control system (corresponding to claim 1) uses a carrier phase difference between amplitude-modulated waves based on a carrier wave of at least one frequency, and combines two or more carrier phase difference presence / absence (1 or 0) It is configured by generating control information based on a plurality of determined code strings.

  In the above control system, the control information is generated based on a plurality of code sequences determined by the combination of the presence or absence (1 or 0) of two or more carrier phase differences, so the type of information depends on the number of bits of the code sequence. The amount of information to be transmitted can be increased.

  In the above configuration, the second control system (corresponding to claim 2) preferably assigns control information using a carrier phase difference between amplitude-modulated waves generated using a carrier wave of one frequency, and performs the control. A control system that transmits and receives information, and generates control information based on each of a plurality of code sequences determined by a combination of carrier phase differences between adjacent amplitude modulation waves in an array of at least three amplitude modulation waves generated in time series It is characterized by that.

  The third control system (corresponding to claim 3) is preferably characterized in that, in the above configuration, the carrier phase difference between the amplitude-modulated waves is determined on the basis of the unit phase angle.

  The fourth control system (corresponding to claim 4) is preferably characterized in that, in the above-described configuration, a plurality of unit phase angles are prepared, and any one of them is used.

  The fifth control system (corresponding to claim 5) is preferably characterized in that, in the above configuration, a plurality of unit phase angles are prepared, and at least two of them are used in combination.

  The sixth control system (corresponding to claim 6) is preferably characterized in that, in the above configuration, the arrangement of amplitude modulation waves is selected by determining a first amplitude modulation wave as a reference.

  The seventh control system (corresponding to claim 7) is characterized in that, in the above-mentioned configuration, the array of amplitude-modulated waves is preferably formed by five amplitude-modulated waves, and the code string is a 4-bit code string. And

  In an eighth control system (corresponding to claim 8), in the above configuration, preferably, the control information is transmitted from the transmission-side apparatus instructing the control to the reception-side apparatus having a control target. And

  In the ninth control system (corresponding to claim 9), in the above configuration, preferably, the transmission side device is a ground device and the reception side device is an onboard device, and the control information is transmitted from the ground device to the onboard device. It is the speed control information transmitted to.

  According to the present invention, since the control information is generated based on a plurality of code sequences determined by the combination of the presence or absence (1 or 0) of two or more carrier phase differences, the type of information according to the number of bits of the code sequence The amount of information to be transmitted can be increased.

It is a system configuration figure showing the whole control system composition concerning the present invention. It is a block diagram which shows the detailed internal structure of a receiving side apparatus. It is a wave form diagram which shows an example of the time series arrangement | sequence of the amplitude modulation wave transmitted from the transmission side to the reception side. It is a phase angle change display pattern figure for explaining the code sequence of information numbers 1-8. It is a phase angle change display pattern figure for explaining the code sequence of information numbers 9-16. It is a wave form diagram which shows an example of the time series arrangement | sequence of the amplitude modulation wave transmitted from the transmission side in the conventional train control system to the receiving side.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments (examples) of the present invention will be described below with reference to the accompanying drawings.

  A typical configuration of the control system according to the present invention will be described with reference to FIGS. 1 and 2. The control system 10 generates and transmits a carrier wave C1 (hereinafter referred to as “carrier wave C1”) that is amplitude-modulated based on the modulated wave corresponding to the control information and phase-shift-modulated based on the amplitude modulation. It comprises a device 11 and a receiving side device 12 that receives this carrier wave C1, extracts control information, and controls the controlled object 13 based on this control information. An example of the control system 10 is typically an ATC device, for example. In this ATC apparatus, as will be described later, in a time-series arrangement of a predetermined number of a plurality of amplitude-modulated waves in the carrier C1, the carrier phase difference for each adjacent modulation wave period is changed, and the amount of change in the phase difference is expressed in bits. In this method, the contents of the code string are used as control information instead of information. The control system according to the present invention is not limited to this type of ATC device, but can be applied to other types of ATC devices and control systems in other fields other than the railway field.

  As described above, the control system 10 includes the transmission side device 11 and the reception side device 12. In the case of an ATC device, the transmission-side device 11 is a ground device, and the reception-side device 12 is an on-vehicle device. The transmission side device 11 and the reception side device 12 are connected by a transmission path (not shown) for transmitting the carrier wave C1. For example, in the case of an ATC device, the transmission path is a rail. In the control system 10, the configuration of the transmission path is generally arbitrary. The transmission side device 11 is a device that transmits control information using the carrier wave C1. The reception side device 12 receives the carrier wave C1 transmitted from the transmission side device 11, extracts control information from the carrier wave C1, generates an output signal for control based on the control information, and gives it to the control target 13. The operation of the control target 13 is controlled based on a control output signal. In the case of an ATC device, the control target 13 is a train, and the control information is train speed limit information.

  The transmission side device 11 includes a carrier wave generation unit 21, a first modulation unit 22, and a second modulation unit 23 connected in series, and each of the first modulation unit 22 and the second modulation unit 23 individually includes “ A control information generating unit 24 that provides a signal related to “carrier wave phase setting” and a signal related to “modulation wave setting”; Prepare. The control information generation unit 24 generates a control information signal related to “carrier wave phase setting” and a control information signal related to “modulation wave setting” based on the control information given from the control information setting unit 25.

  The carrier wave generator 21 generates a carrier wave (reference signal) having a relatively high frequency (fc) and outputs the carrier wave to the first modulator 22. The first modulation unit 22 performs amplitude modulation processing on the carrier wave based on the signal related to “carrier wave phase setting” given from the control information generation unit 24. By this amplitude modulation processing, the carrier phase for each amplitude-modulated wave is changed according to the control information. The carrier wave amplitude-modulated by the first modulation unit 22 is provided to the second modulation unit 23. Based on the signal related to “modulation wave setting” given from the control information generation unit 24, the second modulation unit 23 modulates a predetermined number of sequences of a series of amplitude modulated waves in an amplitude modulated carrier wave. Perform wave setting processing. The number of rows of amplitude-modulated waves is preferably five, for example. The second modulator 23 outputs the carrier wave C1. The carrier wave C1 is a carrier wave subjected to phase shift modulation based on the control information.

  When the first modulation unit 22 amplitude-modulates the carrier wave to generate the carrier wave C1, the control information generation unit 24 transmits a signal related to control information for determining the carrier phase angle for each modulation wave period of the carrier wave C1 to the first modulation unit. 22 The control information generation unit 24 is a means for determining the content of control information transmitted from the transmission side device 11 to the reception side device 12 via the first modulation unit 22 and the second modulation unit 23. When the modulation signal is generated based on amplitude modulation by the first modulation unit 22 and the second modulation unit 23, the control content is determined by the carrier phase difference based on a predetermined number of amplitude modulations regarding the control information to be transmitted to the receiving side. Is done.

  The reception-side device 12 includes a demodulator 31 that demodulates the received carrier wave C1 and a control information extractor 32 that extracts control information from the demodulated signal. The demodulator 31 extracts a plurality of time-series amplitude-modulated waves each including an element that forms control information from the carrier wave C1. The control information extraction unit 32 acquires a code string representing control information based on a predetermined number of time-series amplitude modulated waves, extracts control information based on the code string, and extracts the control information. The control object 13 is given.

  With reference to FIG. 2, the internal configuration of the receiving apparatus 12 will be described in more detail.

  In FIG. 2, a carrier wave C1 subjected to phase shift modulation based on amplitude modulation is input to the demodulation unit 31 of the reception-side device 12. The input carrier wave C1 is distributed and input to the modulated wave detection unit 33 and the phase angle detection unit 34, respectively. The modulated wave detector 33 detects only the modulated wave component of the carrier wave C1 subjected to amplitude modulation. Thereafter, the modulated wave identifying unit 35 of the control information extracting unit 32 identifies the modulated wave based on the modulated wave component.

  The phase angle detector 34 detects the phase angle of each amplitude-modulated wave of the carrier wave C1 (carrier phase angle). Thereafter, the phase angle discriminating unit 36 discriminates the phase difference between adjacent amplitude-modulated waves. The phase angle determination unit 36 preferably obtains, for example, a phase angle difference (carrier wave phase difference) between adjacent amplitude modulation waves in an arrangement of five amplitude modulation waves, and acquires four phase angle differences. Information of these four phase angle differences is given to the next information identification unit 37. Based on the information on the four phase angle differences, the information identification unit 37 determines the control information assigned to the code string based on the code string determined by the combination of the presence or absence (1 or 0) of the phase angle difference (carrier phase difference). Extract. The code string is formed as a 4-bit code string. The content of the control information is, for example, information related to speed, and more specifically, train speed limit information.

  The identification result information output from the modulated wave identification unit 35 and the control information output from the information identification unit 37 are combined by the combination unit 38, and the content of the display is determined based on the combination result of the combination unit 38. The control target 13 is provided with an output signal for controlling the speed and the like.

  In the above description, as the device configuration of the reception-side device 12, the upstream modulation wave detection unit 31 and the phase angle detection unit 34 are realized by a DSP or the like (block 12A indicated by a one-dot chain line), and the downstream modulation wave identification unit 35, phase The angle discriminating unit 36, the information identifying unit 37, and the combining unit 38 are realized by a CPU (a block 12B indicated by a one-dot chain line). In the comparison with the components of the receiving-side device 12 shown in FIG. 1, the block 12A including the modulation wave detection unit 33 and the like corresponds to the demodulation unit 31, and the modulation wave identification unit 35 and the phase angle determination unit. A block 12B including 36 and the like corresponds to the control information extraction unit 32.

  With reference to FIG. 3, an example of a time-series arrangement of amplitude-modulated waves transmitted from the transmission side to the reception side will be described.

As an example, the time-series arrangement of amplitude-modulated waves includes six amplitude-modulated waves M0 to M5. These six amplitude modulation waves M0 to M5 are shown as the same waveform for convenience of illustration, but actually, there is a constant phase difference between two adjacent amplitude modulation waves, or It is assumed that no phase difference has occurred. In the example of the arrangement of six amplitude modulation waves M0 to M5 in the notation of FIG. 3, regarding the relationship between adjacent amplitude modulation waves (M _i , M _{i + 1} : i = 0 to 4), between M0 and M1 There is a phase difference θ1, a phase difference θ2 between M1 and M2, a phase difference θ3 between M2 and M3, a phase difference θ4 between M3 and M4, and a phase difference θ5 between M4 and M5. It is supposed to be. Specifically, each of the phase differences θ1 to θ5 is “a constant phase difference has occurred” or “a phase difference has not occurred”. “A certain phase difference has occurred” means that there is a certain carrier phase difference. “No phase difference has occurred” means that the carrier phase difference is zero. I mean. For the five phase differences θ1 to θ5, “Yes”, that is, “1” is assigned when “a certain phase difference is generated”, and “No”, that is, “0” when “No phase difference is generated”. Assign. As described above, the first amplitude modulation wave M0 is appropriately determined as the reference amplitude modulation wave, and preferably, for example, by selecting an arrangement of five amplitude modulation waves M0 to M4, the five amplitude modulation waves M0 to M4 are used. A code string (code string of 1 and 0) formed by the four generated phase differences θ1 to θ4 is created. The “constant phase difference” is, for example, 45 °, and “no phase difference” is “0 °”. In the description of this embodiment, it is assumed that one angle difference “45 °” is preferably used as the “constant phase difference”. This “constant phase difference” is defined as “unit phase angle”.

  Next, referring to Table 1 and Table 2 below, and FIGS. 4A and 4B, based on the code string (code string of 1 and 0) formed by the above four phase differences θ1 to θ4, Details on how to create control information.

  Table 1 shows the code string formed by the four phase differences θ1 to θ4 generated by the five amplitude-modulated waves M0 to M4 as a phase difference (a constant angle difference). In this embodiment, “45 °” is used as the constant angle difference. In Table 1, in the horizontal direction, four phase differences θ1 to θ4 are shown side by side as shown in the uppermost stage. In the vertical direction of Table 1, 1 to 16 are written as “Information No”. As shown in Table 1, 16 types of information 1 to 16 can be set based on the combination of the case where the phase difference is 45 ° (with phase difference) and the case where the phase difference is 0 ° (no phase difference). .

  When the phase difference of 45 ° (with phase difference) is set to “1” and the phase difference of 0 ° (without phase difference) is set to “0”, the table becomes as shown in Table 2. The code sequence becomes a 4-bit code sequence based on a combination of 1 and 0 for 4 bits by the four phase differences θ1 to θ4.

  According to Table 2, regarding “information No”, information 1 corresponds to a code string “0001” and information 2 corresponds to a code string (information number data) “0010”. Thus, as shown in Table 2, 4-bit code strings correspond to the information 16. Thus, 16 types of “information No. (information number data)” are created, and control information can be assigned to each of the 16 “information No. (information number data)”.

  With reference to FIGS. 4A and 4B, how to employ the above-described code string will be described, and how to change the phase angle will also be described. 4A shows the phase angle change display patterns (1) to (8) of the code string of information 1 to 8, and FIG. 4B shows the phase angle change display patterns (9) to (16) of the code string of information 9 to 16. Show. In each of the phase angle change display patterns (1) to (16), the horizontal axis indicates time, and “◯” at the five intersections shown from the left to the right in the bottom stage indicates the amplitude-modulated waves M0 to M4. It shows conceptually. In each of the phase angle change display patterns (1) to (16), the vertical axis represents the shift of the phase difference (θ). In this example, the phase difference θ is set to 45 ° as described above. The phase difference θ is a carrier phase difference between two adjacent amplitude modulated waves. Therefore, when the first amplitude modulation wave M0 is used as a reference, it changes from + θ to + 4θ, and a phase difference of + 4θ is generated at the maximum. Symbols “1” and “0” between “o” representing amplitude modulated waves M0 to M4 indicate “with phase difference (45 °)” and “without phase difference (0 °)”. In the information 1 of the phase angle change display pattern (1), the code string “0000” is indicated, and in the information 2, the code string “0001” is indicated. Thereafter, similarly, phase angle change display patterns (3) to (16) from information 3 (code string “0010”) to information 16 (code string “1111”) are shown. When the first amplitude modulation wave M0 is used as a reference, the phase difference between the subsequent amplitude modulation waves M1 to M4 changes so as to gradually increase.

  As described above, the four phase differences generated by the five amplitude modulation waves M0 to M4 are determined by determining the amplitude modulation wave M0 as a reference (first data) and selecting the arrangement of the five amplitude modulation waves M0 to M4. By setting a phase difference of 45 ° with respect to θ1 to θ4, 16 code sequences (code sequences of 1 and 0) can be created. By assigning control information to 16 types of code strings, 16 types of control information (information 1 to 16) can be prepared, the amount of information can be increased, and multi-value information can be achieved. For example, information of train speed 50 km / h, information of train speed 55 km / h, and the like can be assigned to each of information 1 to 16. Train speed limit information can be set more finely. Thus, it is possible to perform highly accurate train control based on a large amount of information as compared with the conventional technique.

  The leading amplitude modulated wave as a reference is configured to be identified by adding a flag or the like, for example, so that information required for control can be generated.

  According to the above embodiment, since the 4-bit code sequence is created using each phase difference between the five amplitude modulated waves M0 to M4, the control information is allocated, and is used for transmission of the control information. Can be more. The number of the plurality of amplitude-modulated waves to be used is determined based on a range that allows the time until the information is determined as information from the viewpoint of control. This time, 16 types of information can be created by a 4-bit code string. However, if the set time is increased, the amount of information can be further increased.

  The phase angle detector 34, the phase angle discriminator 36, and the information discriminator 37 of the receiving-side device 12 shown in FIG. A 4-bit code string is created, and control information assigned to the code string is extracted.

  In the above description of the embodiment, the example of “45 °” is used as the unit phase angle that defines the constant phase difference θ, but the unit phase angle is not limited to this. As the unit phase angle that defines the phase difference θ, for example, “90 °”, “135 °”, and the like can be used by increasing the types. Furthermore, a code string can be created by using a plurality of unit phase angles in combination as the phase difference θ. Thereby, the amount of information to be transmitted can be further increased.

  The configurations and the like described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented, and numerical values and elements of the respective configurations are merely examples. Therefore, the present invention is not limited to the described embodiments, and can be variously modified without departing from the scope of the technical idea shown in the claims.

  The control system according to the present invention is used, for example, in an automatic train control device (ATC device), and is used for increasing the amount of transmission of control information.

DESCRIPTION OF SYMBOLS 10 Control system 11 Transmission side apparatus 12 Reception side apparatus 12A DSP
12B CPU
DESCRIPTION OF SYMBOLS 13 Control object 21 Carrier wave generation part 22 1st modulation part 23 2nd modulation part 24 Control information generation part 25 Control information setting part 31 Demodulation part 32 Control information extraction part 33 Modulation wave detection part 34 Phase angle detection part 35 Modulation wave identification part 35 36 Phase angle discriminating unit 37 Information identifying unit 38 Combining unit

Claims (9)

  Using a carrier phase difference between amplitude-modulated waves based on at least one frequency carrier wave, and generating control information based on a plurality of code sequences determined by a combination of two or more carrier phase phase presence / absence (1 or 0) Control system characterized by.   A control system that allocates the control information using the carrier phase difference between the amplitude-modulated waves generated using the carrier wave of one frequency and transmits / receives the control information, and at least three amplitudes generated in time series The control system according to claim 1, wherein the control information is generated based on each of the plurality of code strings determined by a combination related to the carrier phase difference between the amplitude-modulated waves adjacent to each other in an array of modulated waves.   The control system according to claim 1 or 2, wherein the carrier phase difference between the amplitude-modulated waves is determined based on a unit phase angle.   4. The control system according to claim 3, wherein a plurality of the unit phase angles are prepared, and any one of them is used.   4. The control system according to claim 3, wherein a plurality of unit phase angles are prepared, and at least two of them are used in combination.   The control system according to claim 2, wherein the arrangement of the amplitude-modulated waves is selected by determining the first amplitude-modulated wave to be a reference.   The control system according to any one of claims 2 to 6, wherein the array of the amplitude-modulated waves is formed by five amplitude-modulated waves, and the code string is a 4-bit code string.   The control system according to claim 1, wherein the control information is transmitted from a transmission-side device that instructs control to a reception-side device that includes a control target. 9. The transmitting device is a ground device and the receiving device is an onboard device, and the control information is speed control information transmitted from the ground device to the onboard device. The described control system.

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