Ultrahigh-speed low-vacuum pipeline magnetic suspension vehicle-mounted positioning and speed measuring device

Abstract

The invention provides an ultra-high-speed low-vacuum pipeline magnetic suspension vehicle-mounted positioning and speed measuring device which comprises a power supply unit, an antenna unit and a post-stage circuit. The power supply unit is used for outputting high-frequency alternating current; the antenna unit comprises two transmitting antennas and two receiving antennas which are located in the same plane; the planes where the two transmitting antennas and the two receiving antennas are located are parallel to the planes where the suspension coils and the propelling coils on the two sides of the track are located respectively. The two receiving antennas are symmetrically arranged up and down, and the horizontal center lines of the two receiving antennas are respectively aligned with the horizontal center lines of the propulsion coil and the suspension coil in height; the two transmitting antennas are arranged in a bilateral symmetry mode along the vertical center line of the two receiving antennas. The two transmitting antennas are used for generating high-frequency current which is equal in magnitude and opposite in direction and transmitting a high-frequency magnetic field; the two receiving antennas are used for receiving the high-frequency magnetic field emitted by the suspension coil and generating induced voltage with the amplitude related to the train position. And the post-stage circuit is used for acquiring the position and speed information of the train.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic levitation train positioning and speed measurement, in particular to an ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device. Background Art

[0002] The ultra-high-speed, low-vacuum tube magnetic levitation system utilizes superconducting electric levitation as its technical approach. Its propulsion system primarily consists of ground coils generating a traveling wave magnetic field through three-phase current, which interacts with the NSNS magnetic field of the superconducting magnets to generate electromagnetic thrust. Its levitation guidance system consists of superconducting magnets mounted on the vehicle (sidewalls) and passive coils (in a figure-8 pattern) laid on the track (sidewalls). The relative motion between the superconducting magnets and the passive coils generates levitation force, levitating the vehicle. A positioning and speed measurement device provides full-range position and speed information to the traction control system and the operational control system, assisting the traction control system in completing closed-loop control and the operational control system in providing command, dispatch, and safety protection.

[0003] According to the law of electromagnetic induction, the mutual inductance of two parallel coils changes when their relative positions along a parallel plane change. Therefore, when a sinusoidal alternating current is applied to one coil, the alternating voltage received by the other coil will change as the relative position of the two coils changes. Therefore, the positional relationship of the two coils can be determined using this principle. That is, the position and velocity information of the transmitting coil can be obtained by analyzing the envelope of the alternating voltage of the receiving coil.

[0004] The Shanghai Pudong to Longyang maglev demonstration line, currently under construction, uses a combination of absolute and relative positioning. The train's absolute position is determined by installing positioning markers approximately every 200 meters along the line. When a train passes over a marker, an onboard active code reader (INK) reads the position code, obtaining absolute position information. For relative positioning between two positioning markers, when the train is running at high speed (>20 km / h), the synchronous motor's back EMF is sufficiently strong, enabling positioning. However, when the train is starting or running at low speeds (<20 km / h), the synchronous motor's back EMF is weak, requiring an onboard relative position sensor (NUT) to sense the long stator's slots for relative position. The absolute position sensor (INK) uses electromagnetic induction to read the position code on the positioning markers and obtain the train's absolute position. The relative position sensor counts the slots of the long stator by detecting the change in inductance as the coil moves over them.

[0005] The maglev train on Japan's Yamanashi test line uses a cross-induction loop for positioning and speed measurement. The train is equipped with a transmitting antenna that emits pulse signals of a certain frequency. Six induction loops on the track side, crossing every 45 cm, sense the pulse signals emitted by the train's antenna and thereby determine the train's direction, displacement, and speed. Furthermore, coded markers indicating the absolute position of the line are placed every 400 m along the line. As the train passes, the train's absolute position relative to the line is determined, allowing correction of any accumulated positioning errors that may arise from relative counting in the cross-induction loop positioning system.

[0006] Relative positioning technology for high-speed trains: measuring the displacement, speed, acceleration or a combination of several of the trains. Because an initial position point is required, the position of the train is determined based on a relative quantity, such as displacement obtained by direct measurement or integration. Representative technologies include speed sensor-based positioning technology, Doppler radar positioning technology, and inertial positioning technology. However, positioning errors are cumulative, and absolute beacons are usually used for position correction, such as transponders, track circuit insulation joint information, etc. Absolute positioning technology: measuring the position of the train in a certain coordinate system based on a line database or electronic map. Representative technologies include satellite-based positioning technology and transponder-based positioning technology.

[0007] However, the Shanghai Maglev's positioning and speed measurement relies on a slotted iron core to obtain position and speed information through changes in inductance. Since the long stator linear motor of the vacuum tube maglev uses hollow coils without an iron core, this solution is not suitable for high-speed magnetic levitation systems. Japan Magnetic Flux's positioning and speed measurement technology takes into account the need for precise laying of cross-induction loops along the entire line, and the need to install local transmission equipment at intervals of approximately 2km, resulting in relatively high construction and maintenance costs. The disadvantage of high-speed rail positioning and speed measurement technology is that the positioning of the train depends on external facilities. Satellite-based positioning technology depends on whether the terrain on which the train is running will be shielded and the working status of the satellite system, and is not applicable to pipeline maglev systems with closed spatial magnetic fields. Transponder-based positioning technology is affected by the layout of the transponder and cannot continuously obtain the train's position information. Summary of the Invention

[0008] The present invention provides an ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measuring device, which can solve the technical problems in the existing technology that the positioning and speed measuring device relies on ground cross-induction line replacement, resulting in high construction and maintenance costs, the hollow coil has no iron core for detecting changes in tooth slot inductance, and the satellite positioning technology has limited positioning accuracy in the pipeline.

[0009] The present invention provides an ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device, the device comprising a power supply unit, an antenna unit and a post-stage circuit;

[0010] The power supply unit is used to output high-frequency alternating current;

[0011] The antenna unit includes two transmitting antennas and two receiving antennas in the same plane; the planes where the two transmitting antennas and the two receiving antennas are located are respectively parallel to the planes where the suspension coils and the propulsion coils on both sides of the track are located; the two receiving antennas are symmetrically arranged in an up-down manner, and the horizontal center lines of the two receiving antennas are respectively aligned with the heights of the horizontal center lines of the propulsion coils and the horizontal center lines of the suspension coils; the two transmitting antennas are symmetrically arranged in a left-right manner along the vertical center lines of the two receiving antennas; the two transmitting antennas are used to generate high-frequency currents of equal magnitude and opposite directions after receiving high-frequency alternating current power, and to emit high-frequency magnetic fields; when the two transmitting antennas and the suspension coils have a relative displacement in the horizontal direction, the suspension coils receive the high-frequency magnetic fields emitted by the two transmitting antennas, generate high-frequency currents, and emit high-frequency magnetic fields; the two receiving antennas are used to receive the high-frequency magnetic fields emitted by the suspension coils, and generate an induced voltage with an amplitude related to the position of the train;

[0012] The latter circuit is used to obtain the position information and speed information of the train based on the induced voltage whose amplitude is related to the train position.

[0013] Preferably, the power supply unit includes a DC power supply and a high-frequency converter; the DC power supply is used to output DC power; and the high-frequency converter is used to convert DC power into high-frequency AC power.

[0014] Preferably, the post-stage circuit includes a differential circuit, a high-pass filter and a signal processing unit; the differential circuit is used to perform differential processing on the induced voltage whose amplitude is related to the train position to obtain a differential signal; the high-pass filter is used to filter the differential signal to obtain a filtered high-frequency voltage signal; the signal processing unit is used to convert the filtered high-frequency voltage signal into the train's position information and speed information.

[0015] Preferably, the signal processing unit is used to obtain the envelope of the filtered high-frequency voltage signal, convert the envelope of the filtered high-frequency voltage signal into phase information, convert the phase information into the position information of the train based on the size of the suspension coil; and obtain the speed information of the train based on the position information.

[0016] Preferably, the two transmitting antennas are of equal size, and the two receiving antennas are of equal size.

[0017] Preferably, the suspension coils are in an eight-shaped coil structure, and the suspension coils at opposite positions on both sides of the track are connected by a hinge line.

[0018] The technical solution of the present invention utilizes two symmetrical receiving antennas, with their horizontal centerlines aligned at the same height as the horizontal centerlines of the propulsion coil and the suspension coil, respectively. This ensures that the magnetic fields generated by the two transmitting antennas at the receiving antennas complement each other, resulting in an induced voltage close to zero. The two receiving antennas are primarily affected by the magnetic fields of the suspension coil and the propulsion coil. Furthermore, the two transmitting antennas are arranged symmetrically along their vertical centerlines, ensuring that the propulsion coils generate equal induced voltages at the two receiving antennas. Consequently, the high-frequency magnetic field emitted by the suspension coils generates an induced voltage with an amplitude related to the train's position, and the train's position and speed information are obtained based on this induced voltage. In summary, the present invention utilizes the suspension coils as the transmission path for the high-frequency signals from the positioning and speed measurement antennas, reducing the need for ground-based equipment and significantly saving costs. Furthermore, because the signal transmission path is confined to the train and the coils on both sides, the present invention is independent of external signaling equipment and is therefore unaffected by the terrain surrounding the train. Furthermore, the coils on both sides are arranged continuously along the line, enabling continuous acquisition of train position information while the train is in motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the embodiments of the present invention, constitute a part of the specification, illustrate the embodiments of the present invention, and together with the description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 A schematic structural diagram of an ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device according to an embodiment of the present invention is shown;

[0021] Figure 2 A schematic structural diagram of an antenna unit and a circuit module according to an embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 1. DC power supply; 2. High-frequency converter; 3. Right transmitting antenna; 4. Left transmitting antenna; 5. Upper receiving antenna; 6. Lower receiving antenna; 7. Differential circuit; 8. High-pass filter; 9. Signal processing unit; 10. Suspension coil; 11. Propulsion coil; 12. Suspension train frame range. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0027] like Figure 1 and Figure 2 As shown, the present invention provides an ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device, the device comprising a power supply unit, an antenna unit and a post-stage circuit;

[0028] The power supply unit is used to output high-frequency alternating current;

[0029] The antenna unit comprises two transmitting antennas (3, 4) and two receiving antennas (5, 6) in the same plane; the planes where the two transmitting antennas (3, 4) and the two receiving antennas (5, 6) are located are respectively parallel to the planes where the suspension coils 10 and the propulsion coils 11 on both sides of the track are located; the two receiving antennas (5, 6) are symmetrically arranged in an up-down manner, and the horizontal center lines of the two receiving antennas (5, 6) are respectively aligned with the height of the horizontal center lines of the propulsion coils 11 and the horizontal center lines of the suspension coils 10; the two transmitting antennas (3, 4) are arranged in a left-right direction along the vertical center lines of the two receiving antennas (5, 6) The two transmitting antennas (3, 4) are configured to generate high-frequency currents of equal magnitude and opposite directions after receiving high-frequency alternating current power, and to emit a high-frequency magnetic field; when the two transmitting antennas (3, 4) and the suspension coil 10 are relatively displaced in the horizontal direction, the suspension coil 10 receives the high-frequency magnetic field emitted by the two transmitting antennas (3, 4), generates a high-frequency current, and emits a high-frequency magnetic field; the two receiving antennas (5, 6) are configured to receive the high-frequency magnetic field emitted by the suspension coil 10, and generate an induced voltage with an amplitude related to the train position; that is, the amplitude of the induced voltage varies with the train position;

[0030] The latter circuit is used to obtain the position information and speed information of the train based on the induced voltage whose amplitude is related to the train position.

[0031] In the present invention, the positioning speed measuring device is located inside the train ( Figure 2The invention relates to a suspension train frame range 12, wherein when the horizontal relative position of the train and the ground module (suspension coil 10 and propulsion coil 11) changes, the mutual inductance of the two transmitting antennas (3, 4) to the nearest suspension coil 10 changes, so that an induced voltage that changes with the distance is generated in the suspension coil 10. The upper and lower receiving antennas (5, 6) are arranged along the vertical center line of the two transmitting antennas (3, 4). Since the magnetic fields generated by the two transmitting antennas (3, 4) at the receiving antennas (5, 6) are complementary, the induced voltage generated by the transmitting antennas (3, 4) at the two receiving antennas (5, 6) is approximately 0. The two receiving antennas (5, 6) are mainly affected by the magnetic fields of the suspension coil 10 and the propulsion coil 11. Due to the influence of the suspension coil 10, the upper and lower suspension coils 10 are in an eight-shaped coil structure and are connected to the hinge line of the opposite suspension coil 10. Therefore, in the circuit, the four suspension coils 10 are in a parallel structure. Therefore, when an induced voltage is generated on one suspension coil 10, the other three coils will also generate current. Since the self-inductance of the four coils is similar, the current of the other three coils is about 1 / 3 of the current of the suspension coil 10 that generates the induced voltage. Therefore, the ratio of the voltage received by the upper and lower receiving antennas (5, 6) from the suspension coil 10 is 1 / 3. Since the upper and lower receiving antennas (5, 6) are symmetrically arranged along the horizontal center line of the propulsion coil 11, the propulsion coil 11 will generate the same induced voltage on the two receiving antennas (5, 6).

[0032] The present invention utilizes two receiving antennas (5, 6) to be symmetrically arranged vertically, and the horizontal center lines of the two receiving antennas (5, 6) are respectively aligned with the horizontal center lines of the propulsion coil 11 and the horizontal center lines of the suspension coil 10, so that the magnetic fields generated by the two transmitting antennas (3, 4) at the receiving antennas (5, 6) are complementary, so that the induced voltage generated by the transmitting antennas (3, 4) at the two receiving antennas (5, 6) is approximately 0, and the two receiving antennas (5, 6) are mainly affected by the magnetic fields of the suspension coil 10 and the propulsion coil 11; the two transmitting antennas (3, 4) are symmetrically arranged along the vertical center lines of the two receiving antennas (5, 6), so that the propulsion coil 11 generates the same induced voltage at the two receiving antennas (5, 6); therefore, the two transmitting antennas (3, 4) generate an induced voltage with an amplitude related to the train position based on the high-frequency magnetic field emitted by the suspension coil 10; and the train position information and speed information are obtained based on the induced voltage. In summary, the present invention uses the suspension coil 10 as the transmission path of the high-frequency signal of the positioning and speed measurement antenna, reduces the laying of ground equipment, and saves a lot of cost. In addition, since the present invention constrains the signal transmission path to the train and the coils on both sides, it does not rely on external signal equipment and is therefore not affected by the terrain environment in which the train is located. Moreover, the coils on both sides are arranged continuously along the line, so the train's position information can be continuously obtained while the train is running.

[0033] According to one embodiment of the present invention, the power supply unit includes a DC power supply 1 and a high-frequency converter 2; the DC power supply 1 is used to output DC power; and the high-frequency converter 2 is used to convert DC power into high-frequency AC power.

[0034] Specifically, the high-frequency converter 2 includes a BUCK circuit, an H-bridge and an LCC resonant network. Its working principle is as follows: the train's onboard power supply voltage is converted into a lower controllable constant voltage to power the H-bridge through the BUCK circuit, and then inverted into a high-frequency AC square wave through the H-bridge. The LCC resonant network consists of two groups of capacitors and inductors, and through the resonance relationship, the AC square wave output by the H-bridge is converted into a controllable AC constant current source.

[0035] According to an embodiment of the present invention, the two transmitting antennas (3, 4) are equal in size, and the two receiving antennas (5, 6) are equal in size.

[0036] According to an embodiment of the present invention, the suspension coil 10 is in an eight-shaped coil structure, and the suspension coils 10 located opposite to each other on both sides of the track are connected by a hinge line.

[0037] According to one embodiment of the present invention, the post-stage circuit includes a differential circuit 7, a high-pass filter 8 and a signal processing unit 9; the differential circuit 7 is used to perform differential processing on the induced voltage whose amplitude is related to the train position (i.e., the induced voltage whose amplitude is related to the train position of the two receiving antennas (5, 6) is differentiated) to obtain a differential signal; the high-pass filter 8 is used to filter the differential signal to obtain a filtered high-frequency voltage signal; the signal processing unit 9 is used to convert the filtered high-frequency voltage signal into the position information and speed information of the train.

[0038] Among them, the differential circuit 7 is used to offset the influence of the propulsion coil 11 on the receiving antenna (5, 6), the high-pass filter 8 is used to filter low-frequency noise (the pass frequency is the frequency of the transmitting antenna), and the signal processing unit 9 is used to convert the collected voltage into speed and position information.

[0039] Specifically, the signal processing unit 9 is used to obtain the envelope of the filtered high-frequency voltage signal, convert the envelope of the filtered high-frequency voltage signal into phase information, convert the phase information into the position information of the train based on the size of the suspension coil 10; and obtain the speed information of the train based on the position information.

[0040] In order to have a further understanding of the present invention, the following Figure 1 and Figure 2 The ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device of the present invention is described in detail.

[0041] In this embodiment, the antenna units are loaded in parallel onto the suspension frame. The installation position needs to ensure that when the suspension train is running stably, the horizontal center lines of the receiving antennas (5, 6) are highly aligned with the horizontal center lines of the propulsion coil 11 and the horizontal center lines of the suspension coil 10. The power of the transmitting antennas (3, 4) comes from the onboard power supply of the suspension train. The high-frequency converter 2 converts the onboard power of the suspension train into high-frequency sinusoidal alternating current with a constant current effective value. The receiving antennas (5, 6) receive the high-frequency magnetic field coupled through the suspension coil 10.

[0042] When the relative position relationship between the antenna unit and the ground coil changes, the amplitude of the receiving antenna (5, 6) and the effective value of the induced voltage related to the train position change. The amplitude of the induced voltage received by the upper and lower receiving antennas (5, 6) and the train position is first differentially eliminated by the influence of the propulsion coil 11 on the receiving antenna (5, 6) through the differential circuit 7, and then a high-frequency voltage signal is obtained through the high-pass filter 8. The high-frequency voltage signal is input to the signal processing unit 9. The signal processing unit 9 obtains the envelope of the high-frequency voltage signal and converts the envelope into phase information. The phase information is converted into position information through the size of the suspension coil 10 laid on the line. The speed information is solved by integrating the position information with time, thereby completing the function of the positioning and speed measuring device.

[0043] In summary, the present invention provides an ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device, which utilizes two receiving antennas (5, 6) to be symmetrically arranged in an upper and lower manner, and the horizontal center lines of the two receiving antennas (5, 6) are respectively aligned with the height of the horizontal center line of the propulsion coil 11 and the horizontal center line of the suspension coil 10, so that the magnetic fields generated by the two transmitting antennas (3, 4) at the receiving antennas (5, 6) are complementary, so that the induced voltage generated by the transmitting antennas (3, 4) at the two receiving antennas (5, 6) is approximately 0, and the two receiving antennas (5, 6) are mainly affected by the magnetic fields of the suspension coil 10 and the propulsion coil 11; the two transmitting antennas (3, 4) are symmetrically arranged in a left-right manner along the vertical center lines of the two receiving antennas (5, 6), so that the propulsion coil 11 generates the same induced voltage at the two receiving antennas (5, 6); therefore, the two transmitting antennas (3, 4) generate an induced voltage with an amplitude related to the position of the train based on the high-frequency magnetic field emitted by the suspension coil 10; and the position information and speed information of the train are obtained based on the induced voltage. In summary, the present invention uses the suspension coil 10 as the transmission path for the high-frequency signal from the positioning and speed measurement antenna, reducing the need for ground-based installations and significantly saving costs. Furthermore, because the signal transmission path is confined to the train and the coils on both sides, it does not rely on external signaling equipment and is therefore unaffected by the train's terrain. Furthermore, the coils on both sides are arranged continuously along the line, enabling continuous acquisition of train position information while the train is in motion.

[0044] Parts of the present invention that are not described in detail are well known to those skilled in the art.

[0045] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0046] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0047] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An ultra-high-speed low-vacuum pipeline magnetic levitation vehicle-mounted positioning and speed measurement device, characterized in that: The device includes a power supply unit, an antenna unit and a post-stage circuit; The power supply unit is used to output high-frequency alternating current; The antenna unit includes two transmitting antennas and two receiving antennas in the same plane; the planes where the two transmitting antennas and the two receiving antennas are located are respectively parallel to the planes where the suspension coils and the propulsion coils on both sides of the track are located; the two receiving antennas are symmetrically arranged in an up-down manner, and the horizontal center lines of the two receiving antennas are respectively aligned with the heights of the horizontal center lines of the propulsion coils and the horizontal center lines of the suspension coils; the two transmitting antennas are symmetrically arranged in a left-right manner along the vertical center lines of the two receiving antennas; the two transmitting antennas are used to generate high-frequency currents of equal magnitude and opposite directions after receiving high-frequency alternating current power, and to emit high-frequency magnetic fields; when the two transmitting antennas and the suspension coils have a relative displacement in the horizontal direction, the suspension coils receive the high-frequency magnetic fields emitted by the two transmitting antennas, generate high-frequency currents, and emit high-frequency magnetic fields; the two receiving antennas are used to receive the high-frequency magnetic fields emitted by the suspension coils, and generate an induced voltage with an amplitude related to the position of the train; The latter circuit is used to obtain the position information and speed information of the train based on the induced voltage whose amplitude is related to the train position.

2. The device according to claim 1, characterized in that The power supply unit includes a DC power supply and a high-frequency converter; the DC power supply is used to output DC power; the high-frequency converter is used to convert DC power into high-frequency AC power.

3. The device according to claim 1, characterized in that The post-stage circuit includes a differential circuit, a high-pass filter and a signal processing unit; the differential circuit is used to perform differential processing on the induced voltage whose amplitude is related to the train position to obtain a differential signal; the high-pass filter is used to filter the differential signal to obtain a filtered high-frequency voltage signal; the signal processing unit is used to convert the filtered high-frequency voltage signal into the train's position information and speed information.

4. The device according to claim 1, characterized in that The signal processing unit is used to obtain the envelope of the filtered high-frequency voltage signal, convert the envelope of the filtered high-frequency voltage signal into phase information, convert the phase information into train position information based on the size of the suspension coil; and obtain train speed information based on the position information.

5. The device according to claim 1, characterized in that The two transmitting antennas are of equal size, and the two receiving antennas are of equal size.

6. The device according to claim 1, characterized in that The suspension coils are arranged in an eight-shaped structure, and the suspension coils on opposite sides of the track are connected by hinge lines.

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