JP4086156B2 - Position detection device for moving objects - Google Patents

Description

  The present invention relates to a position detection device for a moving body. The moving body position detection apparatus according to the present invention can be widely applied to vehicle position detection in a magnetic levitation railway, breakage detection of a levitation propulsion coil, and the like.

  Conventionally, in a magnetic levitation railway, for example, as described in Patent Document 1, in a general railway, a cross guide line is laid along a guide way corresponding to a rail, and an antenna mounted on the vehicle is used to cross the guide line. The vehicle position was continuously detected by irradiating a signal to and monitoring the signal reception level with a relay device connected to the crossing guide line.

  However, there are problems such as the installation cost of the crossing guide line itself and maintenance such as tension adjustment of the crossing guide line.

  In view of this, a vehicle position detection system based on the principle of detecting rotation of a wheel and detecting a back electromotive force generated in a propulsion coil when the vehicle travels without using a cross induction line is considered.

  However, the wheels are rubber tires, and have a higher degree of elasticity compared to ordinary railway steel wheels. That is, it is conceivable that the wheel diameter varies depending on the vehicle weight, the external environment (temperature, etc.), the cumulative travel distance of rubber tires, and the like.

  As for the back electromotive force, the power is weak in the low speed range, and the position detection accuracy is inferior to the other speed ranges.

  Next, the magnetic levitation railway has levitation / guide coils embedded in both side walls of the guideway, and when the vehicle travels, an electromotive force is generated in the coil by a superconducting magnet mounted on the vehicle, It is a mechanism that allows smooth levitation travel by a force (levitation force) that causes a magnetic force to cause the vehicle to float and a force (guide force) that guides the vehicle in the left-right direction.

  The levitation / guide coils on both side walls are electrically connected by a cable penetrating the bottom surface of the guideway called a null flux cable. If this null flux cable is disconnected, the guiding force cannot be obtained.

Since the levitation / guide coils are laid in the traveling direction of the vehicle at equal intervals of, for example, 90 cm, the number increases in proportion to the length of the section in which the vehicle is driven. Therefore, a means for detecting whether or not each of the many null flux cables is disconnected is necessary, but there is no means for detecting it at present.
JP-A-6-270814

  SUMMARY OF THE INVENTION An object of the present invention is to provide a position detection device for a moving body that can constitute a vehicle position detection system that is low in cost, easy to maintain, and capable of highly accurate position detection in application to a magnetically levitated railway. Is to provide.

  Another problem of the present invention is that it is low in cost and easy to maintain in application to a magnetic levitation railway, and furthermore, disconnection detection that can detect the disconnection of a null flux cable individually and reliably. It is an object of the present invention to provide a position detection device for a moving body that can constitute a system.

  In order to solve the above-described problem, a moving body position detection device according to the present invention includes a coil device and a moving body.

  A large number of the coil devices are arranged at predetermined intervals along the moving body traveling path, each including a first coil and a second coil, and the first coil and the second coil are One closed loop is formed and arranged on both sides of the moving body traveling path.

  The mobile body moves along the mobile body travel path, and includes a transmission device and a reception device. The transmission device includes a transmission antenna and a transmission circuit. The transmitting antenna is disposed so as to be coupled to the first coil. The transmission circuit excites the transmission antenna.

  The receiving device includes a first receiving antenna, a second receiving antenna, and a receiving circuit. The first reception antenna and the second reception antenna are coupled to the second coil with a shift from each other, and receive signals transmitted from the transmission device and the transmission antenna.

  The reception circuit decodes reception signals supplied from the first reception antenna and the second reception antenna.

  The moving body position detection device according to the present invention includes a coil device, and a large number of the coil devices are arranged at predetermined intervals along the moving body traveling path, and each includes a first coil and a first coil. The first coil and the second coil are arranged on both sides of the moving body traveling path.

  The moving body moves along the moving path of the moving body and includes a transmission device. The transmission device includes a transmission antenna and a transmission circuit, and the transmission antenna is disposed so as to be coupled to the first coil. The transmitting circuit excites the transmitting antenna.

  Therefore, when the moving body moves along the moving body traveling path, the transmitting antenna is coupled to the first coil, and the signal transmitted from the transmitting antenna, generally an AC signal, is transmitted by the first coil of the coil device. Received. The coil device includes the second coil together with the first coil. Since the first coil and the second coil constitute one closed loop, the coil device received the first coil. A transmission signal also flows through the second coil.

  The moving body includes a receiving device, and the receiving device includes a first receiving antenna and a second receiving antenna. The first reception antenna and the second reception antenna are coupled to the second coil and receive a transmission signal transmitted from the transmission device and the transmission antenna.

  The reception device includes a reception circuit, and the reception circuit decodes a reception signal supplied from the first reception antenna and the second reception antenna. A moving body position detection device can be configured by a received signal decoding method, and a disconnection detection device can also be configured.

  When configuring the mobile body position detection device, the reception device decodes the received signal according to the following principle and method. Since the first reception antenna and the second reception antenna are coupled to the second coil with a shift from each other, the reception signals flowing through the first reception antenna and the second reception antenna are translated in accordance with the shift. The resulting waveform. Therefore, there is a timing at which the received signal waveforms of the first receiving antenna and the second receiving antenna cross each other. The receiving device can detect the position of the moving body with respect to the second coil from the timing.

  In order to know the position of the moving body, it is necessary to identify the second coil to which the first receiving antenna and the second receiving antenna are actually coupled. Since the position of the second coil to be coupled first by the second receiving antenna is known in advance, the first receiving antenna and the second receiving antenna are actually coupled by counting the number of couplings based on the position. It is possible to identify the second coil.

  When the second coil is formed in a loop shape, the reception signal waveforms of the first reception antenna and the second reception antenna can be set so as to intersect each other in the plane of the loop. According to this configuration, highly accurate position detection can be performed.

  Next, when configuring the disconnection detection device, the reception device determines that there is no reception signal when the first reception antenna and the second reception antenna should receive the transmission signal from the second coil. By doing so, the disconnection of the coil device can be detected. Whether the first reception antenna and the second reception antenna are to receive the transmission signal from the second coil is determined by whether the transmission device sends the transmission signal or the mobile body follows the traveling This can be easily determined with reference to the state of the received signal.

  Since the position of the second coil to be coupled first by the first receiving antenna and the second receiving antenna is known in advance, the first receiving antenna and the second coil are counted by counting the number of couplings based on the position. The second receiving antenna should be actually coupled, and the second coil that is disconnected can be identified.

  An important application example of the moving body position detection apparatus according to the present invention is application to a magnetically levitated railway. In this case, the moving body is a magnetically levitated vehicle, and the first coil and the second coil are coils (hereinafter referred to as levitating and guiding coils) that give levitating force and guiding force to the magnetically levitated vehicle. These coils are embedded in both side walls of the guideway and are connected by a null flux cable. In a magnetically levitated railway, as the vehicle travels, a superconducting magnet mounted on the vehicle generates an electromotive force in the coil, generates a magnetic force, and lifts the vehicle (levitation force). Ascend and run smoothly by the force (guide force) that tries to guide the left and right.

  When the moving body position detection device according to the present invention is applied to a magnetic levitation railway, the levitation. From the coupling of the first coil and the second coil to the guide coil, the position of the vehicle can be detected with high accuracy. The detection principle is as described above. The levitation / guide coils are laid at regular intervals of 90 cm, for example, in the traveling direction of the vehicle. Since the vehicle position is detected from these many null flux cables, the vehicle position detection accuracy becomes extremely high.

  Moreover, since the levitating / guide coil provided naturally in the magnetic levitation railway is used for vehicle position detection, the cost is low and the maintenance is easy.

  When the moving body position detection device according to the present invention is applied to a magnetic levitation railway, the levitation. It is clear that the disconnection of the null flux cable can be detected from the coupling of the first coil and the second coil to the guide coil. As already described, the levitation / guide coil is laid in the traveling direction of the vehicle, for example, at equal intervals of 90 cm. Disconnection of these many null flux cables can be detected individually and reliably according to the running of the vehicle. Moreover, since the levitating / guide coil provided naturally in the magnetic levitation railway is used for vehicle position detection, the cost is low and the maintenance is easy.

  Other objects, configurations and advantages of the invention will be described in more detail with reference to the accompanying drawings. The figure is merely illustrative.

  FIG. 1 is an electric circuit diagram showing a configuration of a moving body position detection apparatus according to the present invention. The illustrated moving body position detection device includes a coil device 1 and a moving body 2. N coil devices 1 (n = 1, 2, 3,...) Are arranged at a predetermined interval G along the moving body travel path 3. Each of the coil devices 1 includes a first coil 11 and a second coil 12. The first coil 11 and the second coil 12 constitute a closed loop and are arranged on both sides of the moving body travel path 3. The first coil 11 and the second coil 12 may have a shape such as a rectangular loop.

  The moving body 2 moves along the moving body travel path 3 and includes a transmitting device 21 and a receiving device 22. The transmission device 21 includes a transmission antenna 211 and a transmission circuit 212. The transmission antenna 211 is arranged on the side surface of the moving body 2 so as to be coupled to the first coil 11. The transmission circuit 212 supplies, for example, an alternating current to the transmission antenna 211 and excites it.

  The reception device 22 includes a first reception antenna 221, a second reception antenna 222, and a reception circuit 223. The first reception antenna 221 and the second reception antenna 222 are coupled to the second coil 12 with a shift from each other, and receive signals transmitted from the transmission device 21 and the transmission antenna 211.

  FIG. 2 is a diagram illustrating a relative relationship between the first receiving antenna 221 and the second receiving antenna 222. In the figure, a first receiving antenna 221 and a second receiving antenna 222 are formed in a rectangular shape, and are coupled to the second coil 12 with a deviation ΔX from each other.

  The reception circuit 223 decodes reception signals supplied from the first reception antenna 221 and the second reception antenna 222. The receiving circuit 223 decodes the received signal and performs signal processing corresponding to position detection and disconnection detection.

  As described above, the moving body position detection device according to the present invention includes the coil device 1, and the coil device 1 is arranged in a large number at predetermined intervals G along the moving body traveling path 3. Includes a first coil 11 and a second coil 12, and the first coil 11 and the second coil 12 are arranged on both sides of the moving body travel path 3.

  The moving body 2 moves along the moving body travel path 3 and includes a transmission device 21. The transmission device 21 includes a transmission antenna 211 and a transmission circuit 212, and the transmission antenna 211 is arranged so as to be coupled to the first coil 11. The transmission circuit 212 excites the transmission antenna 211.

  Therefore, when the mobile body 2 moves along the mobile body travel path 3 in the direction indicated by the arrow A, the transmission antenna 211 is coupled to the first coil 11, and the AC signal transmitted from the transmission antenna 211 is Received by the first coil 11 of the device 1. The coil device 1 includes a second coil 12 together with the first coil 11, and the first coil 11 and the second coil 12 constitute a closed loop. A transmission signal received by the coil 11 also flows through the second coil 12.

  The moving body 2 includes a receiving device 22, and the receiving device 22 includes a first receiving antenna 221 and a second receiving antenna 222. The first reception antenna 221 and the second reception antenna 222 are coupled to the second coil 12 and receive transmission signals transmitted from the transmission device 21 and the transmission antenna 211.

  The receiving device 22 includes a receiving circuit 223. The reception circuit 223 decodes reception signals supplied from the first reception antenna 221 and the second reception antenna 222. A moving body position detection device can be configured by a received signal decoding method, and a disconnection detection device can also be configured.

  When configuring a mobile body position detection device, the reception device 22 decodes the received signal according to the following principle and method. Since the first receiving antenna 221 and the second receiving antenna 222 are coupled to the second coil 12 with a deviation ΔX, the reception signals flowing through the first receiving antenna 221 and the second receiving antenna 222 are shifted by ΔX. Corresponding to, the waveform is translated. Therefore, there is a timing at which the received signal waveforms of the first receiving antenna 221 and the second receiving antenna 222 cross each other. The receiving device 22 can detect the position of the moving body 2 with respect to the second coil 12 from the timing.

  In order to know the position of the moving body 2, it is necessary to specify the second coil 12 to which the first receiving antenna 221 and the second receiving antenna 222 are actually coupled. Since the position of the second coil 12 to which the two receiving antennas 222 are to be coupled first is known in advance, the first receiving antenna 221 and the second coil are counted from the accumulated value by counting the number of couplings based on the position. The second coil 12 to which the second receiving antenna 222 is actually coupled can be identified.

  When the second coil 12 is formed in a loop shape, the reception signal waveforms of the first reception antenna 221 and the second reception antenna 222 can be set so as to intersect each other in the plane of the loop. According to this configuration, highly accurate position detection can be performed.

  Next, when configuring the disconnection detection device, it is received that there is no reception signal when the first reception antenna 221 and the second reception antenna 222 are to receive the transmission signal from the second coil 12. By determining with the apparatus 22, the disconnection of the coil apparatus 1 is detectable. Whether the first reception antenna 221 and the second reception antenna 222 are to receive the transmission signal from the second coil 12 depends on whether the transmission device 21 transmits the transmission signal and the mobile body 2 travels. This can be easily determined with reference to the state of the received signal that has been followed up.

  Since the position of the second coil 12 to which the first receiving antenna 221 and the second receiving antenna 222 are to be coupled first is known in advance, counting the number of couplings based on the position of the second coil 12 makes it possible to calculate the first coil from the accumulated value. The first receiving antenna 221 and the second receiving antenna 222 should be actually coupled, and the disconnected second coil 12 can be identified.

  An important application example of the moving body position detection apparatus according to the present invention is application to a magnetically levitated railway. FIG. 3 is a diagram showing an example of application to a magnetically levitated railway. The moving body 2 is a vehicle that is magnetically levitated (hereinafter referred to as reference numeral 2), and the first coil 11 and the second coil 12 are levitating forces that give the vehicle 2 levitating force and guiding force. It is a guide coil. The first coil 11 and the second coil 12 are embedded in both side walls 41 and 42 of the guideway 4 and are connected by a null flux cable 5. In the magnetic levitation railway, as the vehicle 2 travels, an electromotive force is generated in the first coil 11 and the second coil 12 by a superconducting magnet mounted on the vehicle 2 to generate a magnetic force, and the vehicle 2 is levitated. The levitation is smoothly caused by the force (levitation force) to be caused and the force (guidance force) to guide the vehicle 2 in the left-right direction.

  As a general means for generating a levitation force and a guide force using the first coil 11 and the second coil 12, each of the first coil 11 and the second coil 12 includes two coils ( 111, 112), (121, 122). The coils 111 and 112 are arranged in the vertical direction and are connected so that magnetomotive forces in opposite directions are generated. The coil 121 and the coil 122 constituting the second coil 12 have the same configuration.

  When the moving body position detection device according to the present invention is applied to a magnetic levitation railway, the levitation. The position of the vehicle 2 can be detected with high accuracy from the combination of the first receiving antenna 221 and the second receiving antenna 222 with respect to the first coil 11 and the second coil 12 constituted by the guide coils. Although the principle is as described above, it will be described in more detail with reference to a specific example of the receiving circuit 223.

  FIG. 4 is a block diagram illustrating an example of the receiving circuit 223. The reception circuit 223 illustrated in FIG. 4 includes a circuit portion that processes a reception signal supplied from the first reception antenna 221 and a circuit portion that processes a reception signal supplied from the second reception antenna 222. . These circuit parts have the same circuit configuration.

  The circuit portion that processes the reception signal supplied from the first reception antenna 221 includes a reception signal input unit MT configured by a transformer or the like, a bandpass filter BPF, an amplifier circuit AMP, and a rectifier circuit Rf. The reception signal output from the first reception antenna 221 is supplied to the bandpass filter BPF via the reception signal input unit MT, and a signal belonging to a predetermined frequency band is extracted. The frequency signal extracted by the bandpass filter BPF is amplified to a predetermined level by the amplifier circuit AMP. The amplified signal is rectified by the rectifier circuit Rf to obtain a rectified signal S21.

  Similarly to the circuit portion for the first reception antenna 221, the circuit portion for processing the reception signal supplied from the second reception antenna 222 also includes the reception signal input unit MT, the bandpass filter BPF, and the amplification circuit AMP. And the rectifier circuit Rf, and the rectified signal S22 is obtained from the rectifier circuit Rf by the same circuit action.

  The illustrated receiving circuit 223 further includes a Schmitt circuit SH, a comparison circuit CMP, and an AND gate AND.

  The rectification signal S21 is supplied to the comparison circuit CMP and the Schmitt circuit SH, and the rectification signal S22 is supplied to the comparison circuit CMP. The comparison circuit CMP compares the voltage level of the rectified signal S21 and the voltage level of the rectified signal S22, and outputs high level comparison signals S31 and S32 when both voltage levels are equal.

  In the Schmitt circuit SH, when the voltage of the supplied rectified signal S21 is equal to or higher than a threshold level set in advance in the Schmitt circuit SH, a high level level test signal S4 is generated.

  The AND gate AND outputs a high-level position detection signal S0 when both the comparison signals S31 and S32 and the level test signal S4 are at a high level. In this embodiment, as will be described later, it is the comparison signal S31 that becomes high when the level test signal S4 is high among the comparison signals S31 and S32. As a result, the position detection signal S0 is obtained at a substantially intermediate position of the second coil 12.

  FIG. 5 is a waveform diagram for explaining the operation of the receiving circuit 223 shown in FIG. Next, the operation of the receiving circuit 223 shown in FIG. 4 will be specifically described with reference to FIG. FIG. 5A shows the relative relationship of the transmitting antenna 211 with respect to the first coil 11 and the relative relationship of the first receiving antenna 221 and the second receiving antenna 222 with respect to the second coil 12. The moving body 2 having the transmission antenna 211, the first reception antenna 221 and the second reception antenna 222 travels in the direction indicated by the arrow A.

  5B is a waveform diagram of the rectified signals S21 and S22, FIG. 5C is a waveform diagram of the comparison signals S31 and S32, and FIG. 5D is a waveform diagram of the level verification signal S4 output from the Schmitt circuit SH. FIG. 5E is a waveform diagram of the position detection signal S0 output from the AND gate AND.

As shown in FIG. 5A, when the moving body 2 travels in the direction indicated by the arrow A, the AC signal output from the transmission antenna 211 is received by the first coil 11 and is generated in the first coil 11. Electric power is generated. Since the first coil 11 is connected to the second coil so as to form one circuit loop via the null flux cable 5, the same AC as the first coil 11 is connected to the second coil 12. Current flows.
At the same timing when the transmission antenna 211 is coupled to the first coil 11, the first reception antenna 221 and the second reception antenna 222 are coupled to the second coil 12, and the first reception antenna 221 and the second reception antenna 222 are coupled. Are received by the receiving antenna 222. The received signal is supplied to the rectifier circuit Rf via the received signal input unit MT, the bandpass filter BPF, and the amplifier circuit AMP, and rectified signals S21 and S22 are obtained from the rectifier circuit Rf.

  Here, since the first receiving antenna 221 and the second receiving antenna 222 are coupled to the second coil 12 with a deviation ΔX from each other, the reception signals flowing through the first receiving antenna 221 and the second receiving antenna 222 are Corresponding to the deviation ΔX, the waveform is translated. As shown in FIG. 5B, the rectified signals S21 and S22 corresponding to the reception signals flowing through the first reception antenna 221 and the second reception antenna 222 are also converted into waveforms corresponding to the deviation ΔX. Become.

  Therefore, there is a timing at which the rectified signals S21 and S22 cross each other. At this timing, the voltage values of the rectified signals S21 and S22 are equal to each other. Therefore, a comparison circuit CMP is provided as means for detecting the timing. The comparison circuit CMP compares the voltage levels of the rectified signals S21 and S22, and outputs high level comparison signals S31 and S32 as shown in FIG. 5C when the voltage levels are equal. The comparison signals S31 and S32 are pulse signals having a time interval related to the speed of the vehicle.

  On the other hand, the rectified signal S21 is also supplied to the Schmitt circuit SH. In the Schmitt circuit SH, when the voltage of the rectified signal S21 is equal to or higher than the threshold level set in advance in the Schmitt circuit SH, as shown in FIG.

  The comparison signals S31 and S32 and the level test signal S4 output from the comparison circuit CMP are supplied to the AND gate AND. The AND gate AND outputs a high-level position detection signal S0 when both the comparison signals S31 and S32 and the level test signal S4 are at a high level. In the case of the present embodiment, as is apparent from the combination of FIGS. 5C and 5D, when the level test signal S4 is high, of the comparison signals S31 and S32, This is the comparison signal S31. As a result, as shown in FIG. 5E, the position detection signal S0 is obtained at a substantially intermediate position of the second coil 12. The position detection signal S0 is a pulse signal having a time interval related to the speed of the vehicle 2.

  The levitation / guide coils are laid in the traveling direction of the vehicle 2 at equal intervals of, for example, 90 cm. Since the vehicle position is detected from these many null flux cables, the vehicle position detection accuracy becomes extremely high.

  Moreover, since the levitating / guide coil provided naturally in the magnetic levitation railway is used for vehicle position detection, the cost is low and the maintenance is easy.

  When the moving body position detection device according to the present invention is applied to a magnetic levitation railway, the levitation. It is clear that the disconnection of the null flux cable 5 can be detected from the coupling of the first coil 11 and the second coil 12 to the guide coil.

  As already described, the levitation / guide coil is laid in the traveling direction of the vehicle 2 at an equal interval of, for example, 90 cm. The disconnection of these many null flux cables 5 can be detected individually and reliably in accordance with the traveling of the vehicle 2. Moreover, since the levitating / guide coil provided naturally in the magnetic levitation railway is used for vehicle position detection, the cost is low and the maintenance is easy.

  FIG. 6 is a block diagram showing still another embodiment of the position detection apparatus for a moving body according to the present invention. The figure shows an example suitable as a null flux cable disconnection detection device in a magnetic levitation railway. The vehicle 2 includes a detection unit 23 together with the transmission device 21 and the reception device 22. The transmission device 21 and the reception device 22 have the configuration and operation described with reference to FIGS. Briefly, the transmitting device 21 irradiates the levitation / guide coil 11 with an AC signal from the transmission antenna 211, and the irradiated signal travels through the null flux cable 5 to the levitation / guide coil 12 on the opposite side of the guideway. Be guided to.

  The receiving device 22 receives the signal guided to the levitation / guide coil 12 by the first and second receiving antennas 221 and 222, and detects the disconnection in the detecting unit 23 when the received signal is equal to or higher than a certain voltage. The signal S0 is output as a pulse signal.

  The detection unit 23 receives supply of vehicle speed information Sv provided separately from the pulse signal S0 output from the receiving device 22, and determines whether or not the detected pulse waveform interval is a predetermined installation interval.

  The detection unit 23 sets a test start position before starting the movement of the vehicle, and records the disconnection detection portion on various recording media 24 such as a recording paper, a magnetic disk, or a magneto-optical disk.

  The recording medium 24 is checked by an analysis device 61 such as a separately prepared computer, and the result is recorded on a display 62 or a printing machine 63 connected to the analysis device 61 to perform maintenance work at the location where the disconnection occurs. Used for arrangements.

  According to the above-described null flux cable disconnection detection device, it is possible to monitor and record signal loss while monitoring the number of levitation / guide coils 11 and 12 that have passed as the vehicle 2 travels.

It is an electric circuit diagram which shows the structure of the position detection apparatus of the moving body which concerns on this invention. It is a figure which shows the relative relationship of a 1st receiving antenna and a 2nd receiving antenna. It is a figure which shows the example which applied the position detection apparatus of the moving body which concerns on this invention to a magnetic levitation type railway. It is a block diagram which shows an example of a receiving circuit. FIG. 5 is a waveform diagram for explaining the operation of the receiving circuit shown in FIG. 4. It is a block diagram which shows another Example of the position detection apparatus of the moving body which concerns on this invention.

Explanation of symbols

1 Coil device
2 moving body 11 first coil 12 second coil 21 transmitting device 22 receiving device 211 transmitting antenna 212 transmitting circuit 221 first receiving antenna 222 second receiving antenna 223 receiving circuit

Claims (5)

A moving body position detection device including a coil device and a moving body,
A large number of the coil devices are arranged at predetermined intervals along the moving body traveling path, each including a first coil and a second coil, and the first coil and the second coil are It constitutes a closed loop and is arranged on both sides of the moving body traveling path.
The mobile body moves along the mobile body travel path, and includes a transmission device and a reception device,
The transmission device includes a transmission antenna and a transmission circuit,
The transmitting antenna is arranged to be coupled to the first coil;
The transmission circuit excites the transmission antenna,
The receiving device includes a first receiving antenna, a second receiving antenna, and a receiving circuit,
It said first receiving antenna and said second receive antenna, be those each other with a displacement coupled with the second coil, for receiving the signal transmitted from the transmitting apparatus and the transmitting antenna, the deviation is The waveform of the received signal received by the first receiving antenna and the second receiving antenna is caused to cross each other,
The reception circuit is supplied with the reception signal from the first reception antenna and the second reception antenna, and detects the position of the moving body with respect to the second coil from the timing at which the reception signal intersects. To
A moving body position detector. A position detection apparatus for a moving body according to claim 1,
The moving body is a magnetically levitated vehicle;
The first coil and the second coil are coils that provide levitation force and guidance force to the magnetic levitation vehicle, and are connected by a null flux cable.
A moving body position detector. A position detection apparatus for a moving body according to claim 2,
The receiving circuit is a combination of the coil device and the first receiving antenna and the second receiving antenna that accompany the traveling of the moving body, with one coil device selected and specified from the coil device as a reference. Count the number of times, and detect the position of the moving body from the counted value,
A moving body position detector. A position detection apparatus for a moving body according to claim 2,
The receiving circuit detects disconnection and connection of the first coil, the second coil, and a null flux cable.
A moving body position detector. The position detection apparatus for a moving body according to any one of claims 1 to 4 , further comprising a detection unit,
The receiving circuit generates a pulse signal having a time interval related to a vehicle speed at the timing of the crossing of the received signals ;
The detection unit is supplied with the pulse signal from the receiving circuit and also supplied with velocity information of the moving body, determines whether the interval of the pulse signal is a predetermined interval, and records it on a recording medium. A moving body position detection device.

Images