A method for multi-object speed measurement positioning

Abstract

The application relates to a multi-object velocity measurement positioning method, and the method is based on a multi-object velocity measurement positioning system, wherein the system comprises a measurement PCB board, S1, a passive closed loop PCB board corresponding to an object to be measured is arranged on the measurement PCB board; S2, a first eddy current magnetic field is generated, the first eddy current magnetic field generates a first eddy current electric field, and the first eddy current electric field changes with the position of the passive closed loop PCB board; S3, an excitation signal is controlled to change, an alternating magnetic field generates a second eddy current electric field; S4, an induced electromotive force is generated, a receiving coil of the measurement PCB board receives the induced electromotive force, and position information and speed information are obtained based on the voltage corresponding to the induced electromotive force. Compared with the prior art, the application has the advantages of effectively distinguishing data of different objects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of simultaneous position and velocity detection of multiple objects, and particularly to a method for multiple object velocity measurement and positioning. BACKGROUND

[0002] In modern industry, especially in the scenarios of fast material handling, intelligent logistics sorting, automated assembly line, etc., in order to determine whether the operating objects, transportation objects, etc. are in a normal state, or to adjust the working state, mode, etc. of the system to which the objects belong in real time, it is often necessary to measure the specific position and movement speed, etc. of the real-time state information of the objects. At present, commonly used velocity measurement and positioning devices include magnetic grating type, optical grating type, cross inductive loop type sensors or sensing systems, and there are also methods for velocity measurement and positioning using computer vision technology such as image recognition processing. They all have problems such as high price, high maintenance cost, limited range of measurable relative speed, etc. to varying degrees.

[0003] The solution to the above problems is to use a non-contact passive velocity measurement and positioning system. Generally speaking, sensors based on electromagnetic induction principle are a good choice, but these sensors based on electromagnetic induction principle cannot well distinguish and identify different measured objects, so they are not easy to extend to multiple object velocity measurement and positioning. In addition, there may be problems such as having to change the device structure and increase the complexity of on-site device wiring when increasing or decreasing the number of velocity measurement and positioning objects, which limits their application in most industrial scenarios. SUMMARY

[0004] The purpose of the present application is to provide a method for multiple object velocity measurement and positioning for effectively distinguishing the data of different objects in multiple object velocity measurement. By adjusting the resistance value of the external resistance, the quality factor of the RLC passive closed loop can be changed, and finally the induced voltage of different amplitudes can be measured at the output end of the receiving coil. By distinguishing the induced voltage of different amplitudes, different RLC passive closed loops can be distinguished and identified, that is, different measured objects can be distinguished and identified.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A method for multiple object velocity measurement and positioning, the method of the present application is based on a multiple object velocity measurement and positioning system, the multiple object velocity measurement and positioning system comprises a measurement PCB, and a plurality of passive closed loop PCBs are arranged on the measurement PCB, the resistance values of patch resistors in each passive closed loop PCB are different from each other, and the method comprises the following steps:

[0007] S1, the passive closed loop PCB corresponding to the measured object is arranged on the measurement PCB, and the passive closed loop PCB is located in an axisymmetric alternating magnetic field generated by an excitation signal in a copper foil excitation coil of the measurement PCB, a fixed frequency of the excitation signal is consistent with a resonant frequency of the passive closed loop PCB;

[0008] S2, the passive closed loop PCB generates maximum eddy current under the condition of a series resonant frequency, the maximum eddy current generates a first eddy current magnetic field, the first eddy current magnetic field generates a first eddy current electric field, and the first eddy current electric field changes with the position of the passive closed loop PCB;

[0009] S3, the excitation signal is controlled to change, and the alternating magnetic field generates a second eddy current electric field;

[0010] S4, an induced electromotive force is generated under the action of the first eddy current electric field and the second eddy current electric field opposite to the direction of the first eddy current electric field, a receiving coil of the measurement PCB receives the induced electromotive force, position information and speed information are obtained based on the voltage corresponding to the induced electromotive force, and different amplitudes of the induced electromotive force correspond to different measured objects.

[0011] Further, the measurement PCB further comprises a first excitation signal application port, a second excitation signal application port, a copper-clad plate and a receiving coil induced voltage output end;

[0012] The first excitation signal application port and the second excitation signal application port are used for applying the excitation signal.

[0013] The receiving coil induced voltage output end is used for outputting the induced electromotive force.

[0014] Further, the copper foil excitation coil, the receiving coil, the first excitation signal application port, the second excitation signal application port and the receiving coil induced voltage output end are mounted on the copper-clad plate.

[0015] Further, the passive closed loop PCB comprises a patch resistor, a printed copper foil coil and a patch tuning capacitor.

[0016] Further, the number of the passive closed loop PCBs is three, which are a first passive closed loop PCB, a second passive closed loop PCB and a third passive closed loop PCB, wherein the first passive closed loop PCB comprises a first patch resistor R1, a first printed copper foil coil, a first patch tuning capacitor and a first PCB body; the second passive closed loop PCB comprises a second patch resistor R2, a second printed copper foil coil, a second patch tuning capacitor and a second PCB body; and the third passive closed loop PCB comprises a third patch resistor R3, a third printed copper foil coil, a third patch tuning capacitor and a third PCB body.

[0017] Further, the resistance values of the three patch resistors have a mathematical relationship R k = n k R1(k=2, 3);

[0018]

[0019] wherein, κ TxT is the mutual inductance between the copper foil excitation coil and the first printed copper foil coil; Q Tx and Q T1 are the quality factors of the coil circuit of the measurement PCB and the first passive closed loop PCB respectively, R T is the loss resistance value of the passive closed loop PCB, and λ is the multiple of the voltage amplitude induced in the receiving coil of the measurement PCB by the second passive closed loop PCB relative to the voltage amplitude induced in the receiving coil of the measurement PCB by the first passive closed loop PCB.

[0020] Further, the relationship between the voltage amplitude induced in the receiving coil of the measurement PCB by the second passive closed loop PCB and the voltage amplitude induced in the receiving coil of the measurement PCB by the first passive closed loop PCB is:

[0021]

[0022] wherein, A1, A2, and A3 are the voltage amplitudes induced in the receiving coil of the measurement PCB by the three passive closed loop PCBs respectively.

[0023] Further, the multiple satisfies:

[0024]

[0025] wherein, N is the number of passive closed loop PCBs.

[0026] Further, the resistance values of the first patch resistor R1, the second patch resistor R2, and the third patch resistor R3 are different from each other, and the quality factors of the three passive closed loop PCBs are different.

[0027] Further, the first patch tuning capacitor, the second patch tuning capacitor, and the third patch tuning capacitor are completely identical, and the first printed copper foil coil, the second printed copper foil coil, and the third printed copper foil coil are completely identical.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] In the series RLC passive closed loop of the application, by adjusting the resistance value of the external resistance, the quality factor of the RLC passive closed loop can be changed, and finally the induced voltage of different amplitudes is measured at the output end of the receiving coil. By distinguishing the induced voltage of different amplitudes, different RLC passive closed loops can be distinguished and identified, that is, different measured objects can be distinguished and identified, which can be extended to multi-object speed measurement and positioning. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structure diagram of the multi-object speed measurement and positioning system of the application is shown in the figure.

[0031] Figure 2 The measurement PCB board for measuring linear motion objects of the multi-object speed measurement and positioning system of the application.

[0032] Figure 3 The three RLC passive closed loop PCB boards of the multi-object speed measurement and positioning system of the application.

[0033] Figure 4 The design flowchart of the multi-object speed measurement and positioning system of the application.

[0034] In the figure, the measurement PCB board 1, the copper foil excitation coil 11, the receiving coil 12, the first excitation signal application port 13, the second excitation signal application port 14, the copper-clad board 15, the receiving coil induced voltage output end 16, the first passive closed loop PCB board 2, the first chip resistor R124, the first printed copper foil coil 22, the first chip tuning capacitor 23, the first PCB board body 21, the second passive closed loop PCB board 3, the second chip resistor R234, the second printed copper foil coil 32, the second chip tuning capacitor 33, and the second PCB board body 31; the third passive closed loop PCB board 4 includes the third chip resistor R344, the third printed copper foil coil 42, the third chip tuning capacitor 43, and the third PCB board body 41. DETAILED DESCRIPTION

[0035] The application will be described in detail below in combination with the drawings and specific embodiments. The embodiments are implemented on the basis of the technical solutions of the application, and detailed implementation methods and specific operation processes are given, but the protection scope of the application is not limited to the following embodiments.

[0036] The method of the present application is based on the principle that the resistance value of a circuit does not affect the resonant frequency of the circuit in the theory of series circuit resonance, but changes the quality factor of the circuit, and the multi-object speed measurement and positioning system adopting the method comprises an RLC passive closed loop PCB board, an excitation coil and a measurement PCB board on which symmetrical receiving coils are printed, the RLC passive closed loop PCB board comprises a patch tuning capacitor, a patch resistor and a printed copper foil coil, when the plurality of RLC passive closed loop PCB boards are overlapped on the measurement PCB board and move, due to the difference in the quality factor between the RLC passive closed loop PCB boards, the induced voltage amplitude induced on the receiving coils of the measurement PCB board is also different, and thus the different speed measurement and positioning objects can be distinguished and identified through the difference in the induced voltage amplitude, and the position and speed information of each speed measurement and positioning object can be obtained by solving the induced voltage, and the design process of the multi-object speed measurement and positioning system meets the demand characteristics of industrialized rapid batch design, and the production efficiency can be improved, and the method has a wide application prospect.

[0037] The present application provides a multi-object speed measurement and positioning method, the method of the present application is based on a multi-object speed measurement and positioning system, the multi-object speed measurement and positioning system comprises a measurement PCB board 1, a plurality of passive closed loop PCB boards are arranged on the measurement PCB board 1, the patch resistors in each passive closed loop PCB board are different from each other, and the method comprises the following steps:

[0038] S1, the passive closed loop PCB board corresponding to the measured object is arranged on the measurement PCB board 1, the passive closed loop PCB board is located in the axisymmetric alternating magnetic field generated by the excitation signal in the copper foil excitation coil 11 of the measurement PCB board 1, and the fixed frequency of the excitation signal is consistent with the resonant frequency of the passive closed loop PCB board;

[0039] S2, the passive closed loop PCB board generates maximum eddy current under the condition of series resonant frequency, the maximum eddy current generates a first eddy current magnetic field, the first eddy current magnetic field generates a first eddy current electric field, and the first eddy current electric field changes with the position of the passive closed loop PCB board;

[0040] S3, the excitation signal is controlled to change, and the alternating magnetic field generates a second eddy current electric field;

[0041] S4, an induced electromotive force is generated under the action of the first eddy current electric field and the second eddy current electric field opposite to the first eddy current electric field, the receiving coil 12 of the measurement PCB board 1 receives the induced electromotive force, the position information and the speed information are obtained based on the voltage corresponding to the induced electromotive force, and the induced electromotive force with different amplitudes corresponds to different measured objects.

[0042] The application utilizes electromagnetic induction and circuit resonance principle to measure the motion state of an object, which includes position and speed information, and the circuit resonance principle is used to change the electromagnetic field energy with maximum power transfer, so as to output the change of physical quantity containing position and speed information by using the electromagnetic induction principle, and the change of physical quantity is specifically represented as the change of induced voltage caused by electromagnetic field change, and the multi-object velocity measurement and positioning method adopts a design based on the difference of circuit quality factor to distinguish and identify different measured objects. The composition of the multi-object velocity measurement and positioning system includes an RLC passive closed loop PCB, an excitation coil and a symmetric receiving coil printed on a measurement PCB, the RLC passive closed loop PCB includes a patch tuning capacitor, a patch resistor and a printed copper foil coil, the tuning capacitor and the inductance of the copper foil coil jointly determine the resonance frequency of the RLC passive closed loop, and the patch resistor is used to change the quality factor of the RLC passive closed loop. In the multi-object velocity measurement and positioning system, the number of RLC passive closed loop PCBs is equal to the number of objects that need to be measured and positioned. When designing the RLC passive closed loop PCBs, the patch tuning capacitor values and the parameters of the printed copper foil coils are consistent, and the patch resistor values are different. When the RLC passive closed loop PCBs with different quality factors move on the measurement PCB, the induced voltage amplitudes induced in the symmetric receiving coils of the measurement PCB are different, and different velocity measurement and positioning objects can be distinguished and identified through the difference of the induced voltage amplitudes.

[0043] The application utilizes the principle that the resistance value of a circuit in series circuit resonance theory does not affect the resonance frequency of the circuit, but changes the quality factor of the circuit.

[0044] The application includes four steps when designing a multi-object velocity measurement and positioning system.

[0045] Step one: design the parameters of the excitation coil and the receiving coil according to the application scenario, and print them into a measurement PCB.

[0046] Step two: determine the number of objects that need to be measured and positioned in the application scenario, and determine the number (more than one) of RLC passive closed loop PCBs and their resonance frequencies according to the number of objects, and determine the resistance value of the patch resistor of the first RLC passive closed loop PCB.

[0047] Step three: determine the patch resistor value of the next RLC passive closed loop PCB according to the multiple of the receiving coil output end induced voltage amplitude that needs to be changed, and the design of the copper foil coil and the tuning capacitor of the RLC passive closed loop PCB does not need to be changed.

[0048] Step four: check whether the required number of RLC passive closed loop PCB boards in step two has been designed; if yes, end the design process, if not, return to step three.

[0049] The most important thing of the above design process is to design the parameters of the excitation coil and the receiving coil of the measurement PCB. In step two, the number of speed measurement positioning objects in the system needs to be determined first, that is, the number of RLC passive closed loop PCB boards that need to be designed is determined, and the parameters of the first RLC passive closed loop PCB board are designed according to the preset resonant frequency, especially the resistance value of the patch resistor R1 in embodiment three.

[0050] In step three, according to the required change of the receiving coil output end induced voltage amplitude multiple λ in embodiment three, the parameters of the next RLC passive closed loop PCB board are determined, wherein the design of the patch tuning capacitor and the copper foil coil is unchanged, and the patch resistance value is calculated according to the relationship of R k =n k R1(k=2,3,……).

[0051] In step four, the number of RLC passive closed loop PCB boards that need to be designed in step two is checked, if the design of the number of RLC passive closed loop PCB boards has been completed, the design process is ended, if not, return to step three.

[0052] The flow chart of the design is shown in Figure 4 There is a mathematical relationship between the required change of the receiving coil output end induced voltage amplitude multiple in step three and the number of RLC passive closed loop PCB boards required in step two, which needs to be derived according to the specific scene requirements.

[0053] There is a mathematical relationship between the patch resistance value of the next RLC passive closed loop PCB board in step three, the required change of the receiving coil output end induced voltage amplitude multiple in step three, and the number of RLC passive closed loop PCB boards required in step two, which needs to be derived according to the specific scene requirements. The mathematical relationship is used to determine the related parameters in the design process of the multi-object speed measurement positioning system.

[0054] The working principle of the application is as follows:

[0055] The motion state of an object is measured by using electromagnetic induction and circuit resonance principles, the motion state including position and speed information, the circuit resonance principle being used to change the electromagnetic field energy in a maximum power transfer, thereby using the electromagnetic induction principle to output a change in a physical quantity containing position and speed information, the change in the physical quantity being specifically a change in an induced voltage caused by a change in the electromagnetic field, and the multi-object velocity measurement and positioning method using a method based on a difference in a circuit quality factor to distinguish and identify different measured objects.

[0056] The measured object of the application carries a passive closed loop PCB, which only contains three series parts, namely a capacitor for tuning, an external resistor and a coil wound around several turns as an inductor.

[0057] The three series parts together constitute a series RLC passive closed loop, which is then placed in an axisymmetric alternating magnetic field generated by an excitation signal of a fixed frequency applied in an excitation coil, and the fixed frequency is consistent with the resonance frequency of the RLC passive closed loop.

[0058] Since the frequency of the excitation signal is equal to the resonance frequency of the RLC passive closed loop, the RLC passive closed loop will generate maximum eddy current under the condition of series resonance frequency, and the magnetic field generated by the eddy current is opposite to the direction of the axisymmetric alternating magnetic field.

[0059] Since the direction of the eddy current magnetic field is opposite to that of the alternating magnetic field, the magnetic flux below the RLC passive closed loop changes, and is weakened compared with the magnetic flux not below the RLC passive closed loop.

[0060] When the size of the excitation signal of a fixed frequency changes, the axisymmetric alternating magnetic field generates a vortex electric field, and the eddy current magnetic field also generates a vortex electric field according to the right-hand rule, and the directions of the two vortex electric fields are consistent with the directions of the magnetic flux of the two magnetic fields, and are opposite to each other.

[0061] The symmetric receiving coil in the same plane as the excitation coil generates an induced electromotive force under the action of the two vortex electric fields in opposite directions as described above, and the induced voltage can be measured at the output end of the receiving coil.

[0062] Since the RLC passive closed loop generates resonance and maximum eddy current, the RLC passive closed loop is transmitting electromagnetic field energy changes to the receiving coil in a maximum power transfer.

[0063] The symmetrical receiving coil has a shape periodically changing along the direction of movement of the RLC passive closed loop, so that when the RLC passive closed loop moves, the magnetic flux and the field strength of the eddy current field below the RLC passive closed loop periodically change, and the change is reflected to the output end of the receiving coil, that is, the size of the measured induced voltage, which also periodically changes with the movement of the RLC passive closed loop.

[0064] The size of the induced voltage at the input end of the receiving coil contains the position information of the measured object, and the speed information can also be obtained by differentiating the position information.

[0065] Since the receiving coil is symmetrical, when the magnetic field generated by the RLC passive closed loop does not overlap with the axisymmetric alternating magnetic field, the induced voltage measured by the receiving coil is zero, which ensures that the position of the RLC passive closed loop is not mismeasured.

[0066] According to the resonance theory of series circuit, the resistance value in the circuit does not affect the resonance frequency of the circuit, but changes the quality factor of the circuit, so in the series RLC passive closed loop, by adjusting the resistance value of the external resistance, the quality factor of the RLC passive closed loop can be changed, and finally different amplitudes of induced voltage are measured at the output end of the receiving coil.

[0067] By distinguishing the induced voltages of different amplitudes, different RLC passive closed loops can be distinguished and identified, that is, different measured objects can be distinguished and identified.

[0068] The multi-object speed measurement and positioning system of the method comprises a RLC passive closed loop PCB board, an excitation coil and a symmetrical receiving coil printed on a measurement PCB board, the RLC passive closed loop PCB board comprises a patch tuning capacitor, a patch resistor and a printed copper foil coil, the tuning capacitor and the inductance of the copper foil coil jointly determine the resonance frequency of the RLC passive closed loop, and the patch resistor is used to change the quality factor of the RLC passive closed loop.

[0069] The beneficial effects of the present application compared with the prior art are:

[0070] 1. The present application is based on the resonance principle of series circuit, and proposes a method for realizing multi-object speed measurement and positioning by means of differentiating the quality factor of the circuit, which solves the problem that the existing sensors based on the principle of electromagnetic induction cannot well distinguish and identify different measured objects.

[0071] 2. The multi-object velocity measurement positioning method is based on the proposed method, and a system for realizing the method and a design process thereof are proposed for practical application, which can realize the goal of industrialized rapid batch design and production efficiency improvement, and achieve double economic benefits of design and manufacturing.

[0072] The measurement PCB board 1 further comprises a first excitation signal application port 13, a second excitation signal application port 14, a copper-clad plate 15, and a receiving coil induced voltage output end 16.

[0073] The first excitation signal application port 13 and the second excitation signal application port 14 are used for applying excitation signals.

[0074] The receiving coil induced voltage output end 16 is used for outputting induced electromotive force.

[0075] The copper foil excitation coil 11, the receiving coil 12, the first excitation signal application port 13, the second excitation signal application port 14, and the receiving coil induced voltage output end 16 are installed on the copper-clad plate 15.

[0076] The passive closed loop PCB board comprises a patch resistor, a printed copper foil coil, and a patch tuning capacitor.

[0077] For example, the number of passive closed loop PCB boards is 3, which are a first passive closed loop PCB board 2, a second passive closed loop PCB board 3, and a third passive closed loop PCB board 4. Figure 1 As shown in the structure diagram of the multi-object velocity measurement positioning system. Figure 2 As shown in the measurement PCB board for measuring a linear motion object. Figure 3 As shown in the three RLC passive closed loop PCB boards of the multi-object velocity measurement positioning system.

[0078] The first passive closed loop PCB board 2 comprises a first patch resistor R124, a first printed copper foil coil 22, a first patch tuning capacitor 23, and a first PCB board body 21; the second passive closed loop PCB board 3 comprises a second patch resistor R234, a second printed copper foil coil 32, a second patch tuning capacitor 33, and a second PCB board body 31; and the third passive closed loop PCB board 4 comprises a third patch resistor R344, a third printed copper foil coil 42, a third patch tuning capacitor 43, and a third PCB board body 41.

[0079] In the above structure, one measuring PCB board 1 for measuring the straight line moving object and three RLC passive closed loop PCB boards 2, 3 and 4 with different patch resistance values are included. The three RLC passive closed loop PCB boards 2, 3 and 4 are overlapped on the measuring PCB board 1 for movement. The three RLC passive closed loop PCB boards 2, 3 and 4 have patch resistance, patch tuning capacitor and printed copper foil coil, and the parameters of the patch tuning capacitor and the printed copper foil coil are the same, except that the resistance values of the patch resistances are different. According to the relationship between the resonant frequency and the inductance value and the capacitance value of the series circuit at resonance, the three RLC passive closed loop PCB boards 2, 3 and 4 have the same excitation signal frequency when moving on the measuring PCB board 1. The measuring PCB board includes a copper foil excitation coil 11, a sine-shaped copper foil receiving coil 12, excitation signal application ports 13 and 14, a copper-clad plate 15 and a receiving coil induced voltage output end 16. It should be noted that the receiving coil 12 can be in other shapes such as parallelogram and rectangle. It should also be noted that according to the actual application scenario, patch resistors, patch capacitors and other circuit components can be added to the copper-clad plate 15 in the embodiment to meet the actual needs. The copper foil coil and all other possible circuit components in the embodiment are printed or soldered on the copper-clad plate 15.

[0080] The three RLC passive closed loop PCB boards with different patch resistance values have patch resistors 24, 34 and 44 with different resistance values, patch tuning capacitors 23, 33 and 43 with the same capacitance value, and rectangular printed copper foil coils 22, 32 and 42 which are also the same. The three RLC passive closed loop PCB boards with different patch resistance values are made of copper-clad plates 21, 31 and 41.

[0081] In the embodiment, the patch resistance values of the second and third RLC passive closed loop PCB boards and the patch resistance value of the first RLC passive closed loop PCB board have a mathematical relationship R k =n k R1(k=2,3), wherein:

[0082]

[0083] κ TxT is the mutual inductance between the excitation coil 11 of the measuring PCB board in the embodiment and the copper foil coil 22 of the first RLC passive closed loop PCB board in the embodiment; Q Tx and Q T1Q is the quality factor of the coil circuit of the measurement PCB board in the embodiment and the quality factor of the first RLC passive closed loop PCB board copper foil coil circuit described in the embodiment; R T is the inevitable loss resistance value of the RLC passive closed loop PCB board copper foil coil circuit in the embodiment, and it should be noted that in the three RLC passive closed loop PCB boards, the value is theoretically the same; λ is the multiple of the voltage amplitude induced in the receiving coil 12 of the second passive closed loop PCB board relative to the voltage amplitude induced in the receiving coil 12 of the first passive closed loop PCB board in the embodiment described in the embodiment, that is, the multiple of the receiving coil output induced voltage amplitude that needs to be changed, and the mathematical relationship between them is described by the following formula.

[0084]

[0085] Wherein A1, A2, A3 are the voltage amplitudes induced in the receiving coil 12 of the measurement PCB board in the embodiment two described in the embodiment. In the design and application scenario of the embodiment, the selection range of λ value needs to meet the following mathematical relationship:

[0086]

[0087] Wherein N is the total number of RLC passive closed loop PCB boards in the system, and in the embodiment, as shown before, the value is 3.

[0088] In the design of the embodiment as described above, the relationship between A1, A2, A3 is ultimately expressed by the following function:

[0089]

[0090] It can be seen that since the resistance values of the patch resistors 24, 34 and 44 in the embodiment are different, the circuit quality factors of the three RLC passive closed loop PCB boards 2, 3 and 4 of the embodiment one are realized to be different, and finally different amplitude induced voltages are measured at the receiving coil output. Since the induced voltage contains the position information of the measured object, and the speed information can also be obtained by differentiating the position information, therefore, by solving the induced voltages of the three, the three can be measured and positioned at the same time, and the three can be identified and distinguished according to the size difference of the induced voltage amplitudes. The identification and solution of the size of the induced voltage amplitude can be completed by chips such as FPGA and DSP. Since it is not the focus of the embodiment of the application, and it is a common technology in the related technical field, it is not described here.

[0091] The preferred embodiments of the present application have been described above in detail. It should be understood that modifications and variations to the present application can be affected by those skilled in the art without departing from the scope of the application. Accordingly, it is intended that all of the subject matter of the above description and the claims be interpreted to encompass all such modifications and changes.

Claims

1. A method of multi-object velocity measurement positioning, characterized by, The method is based on a multi-object velocity measurement positioning system, and the multi-object velocity measurement positioning system comprises a measurement PCB board (1) provided with a plurality of passive closed loop PCB boards, patch resistors in each passive closed loop PCB board have different resistance values, and the method comprises the following steps: S1, placing a passive closed loop PCB board corresponding to a measured object on the measurement PCB board (1), the passive closed loop PCB board is located in an axisymmetric alternating magnetic field generated by an excitation signal in a copper foil excitation coil (11) of the measurement PCB board (1), and a fixed frequency of the excitation signal is consistent with a resonant frequency of the passive closed loop PCB board; S2, the passive closed loop PCB board generates maximum eddy current under the condition of a series resonant frequency, the maximum eddy current generates a first eddy current magnetic field, the first eddy current magnetic field generates a first eddy current electric field, and the first eddy current electric field changes with the position of the passive closed loop PCB board; S3, controlling the excitation signal to change, and the alternating magnetic field generates a second eddy current electric field; S4, generating an induced electromotive force under the action of the first eddy current electric field and the second eddy current electric field opposite to the first eddy current electric field, a receiving coil (12) of the measurement PCB board (1) receives the induced electromotive force, position information and velocity information are obtained based on a voltage corresponding to the induced electromotive force, and different amplitudes of the induced electromotive force correspond to different measured objects; The number of the passive closed loop PCB boards is three, which are a first passive closed loop PCB board (2), a second passive closed loop PCB board (3) and a third passive closed loop PCB board (4), wherein the first passive closed loop PCB board (2) comprises a first patch resistor R1 (24), a first printed copper foil coil (22), a first patch tuning capacitor (23) and a first PCB board body (21); the second passive closed loop PCB board (3) comprises a second patch resistor R2 (34), a second printed copper foil coil (32), a second patch tuning capacitor (33) and a second PCB board body (31); and the third passive closed loop PCB board (4) comprises a third patch resistor R3 (44), a third printed copper foil coil (42), a third patch tuning capacitor (43) and a third PCB board body (41).

3. The mathematical relationship exists between the resistance values of the 3 chip resistors ; wherein is the mutual inductance between the copper foil excitation coil (11) and the first printed copper foil coil (22); and are the quality factors of the coil circuit of the measurement PCB (1) and of the first passive closed loop PCB (2), respectively, is the loss resistance value for the passive closed loop PCB, is the multiple of the voltage amplitude induced in the receiving coil (12) of the measurement PCB (1) by the second passive closed loop PCB (3) with respect to the voltage amplitude induced in the receiving coil (12) of the measurement PCB (1) by the first passive closed loop PCB (2), .​ 2. The method of claim 1, wherein, The measurement PCB board (1) further comprises a first excitation signal application port (13), a second excitation signal application port (14), a copper clad plate (15) and a receiving coil induced voltage output end (16); The first excitation signal application port (13) and the second excitation signal application port (14) are used for applying an excitation signal; The receiving coil induced voltage output end (16) is used for outputting an induced electromotive force.

3. A method of multi-object velocity measurement and localization according to claim 2, wherein, The copper foil excitation coil (11), the receiving coil (12), the first excitation signal application port (13), the second excitation signal application port (14) and the receiving coil induced voltage output end (16) are installed on the copper clad plate (15).

4. The method of claim 1, wherein, The passive closed loop PCB board comprises a patch resistor, a printed copper foil coil and a patch tuning capacitor.

5. The method of claim 1, wherein, The relationship between the voltage amplitude induced in the receiving coil (12) of the measuring PCB (1) by the second passive closed loop PCB (3) and the voltage amplitude induced in the receiving coil (12) of the measuring PCB (1) by the first passive closed loop PCB (2) is: wherein , , are the voltage amplitudes induced in the receiving coil (12) of the measurement PCB (1) by the three passive closed loop PCBs, respectively, .

6. A method of multi-object velocity measurement and localization according to claim 5, wherein, The multiple satisfies: wherein, is the number of passive closed loop PCBs.

7. A method of multi-object velocity measurement and localization according to claim 6, wherein, The resistance values of the first, second and third patch resistors R1 (24), R2 (34) and R3 (44) are different from each other, and the quality factors of the three passive closed loop PCBs are different.

8. A method of multi-object velocity measurement and localization according to claim 7, wherein, The first, second and third patch tuning capacitors (23), (33) and (43) are completely identical, and the first, second and third printed copper foil coils (22), (32) and (42) are completely identical.

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