High-frequency magnetic field positioning circuit and method based on harmonic effect

Abstract

The invention discloses a high-frequency magnetic field positioning circuit and method based on a harmonic effect, a circuit system is composed of a magnetic field generating circuit, a magnetic field receiving circuit and a positioned circuit, and the positioning method comprises the following steps: the magnetic field generating circuit generates a fundamental frequency magnetic field signal; the positioned circuit generates a fundamental frequency induction current and generates a second harmonic magnetic field signal; the fundamental frequency magnetic field signal and the second harmonic magnetic field signal are mixed with the second harmonic signal of the oscillator at the mixer to generate a direct current output signal; the output signal reflects the distance and angle relation between a positioned circuit and a magnetic field receiving and transmitting coil, a plurality of magnetic field transmitting circuits, magnetic field receiving circuits and magnetic field receiving and transmitting coils with known coordinates are arranged on the edge of a positioned space, and the position and posture of the positioned circuit are calculated by collecting the signal generated by the positioned circuit. The circuit and method are used for monitoring the position and state of in vivo medical devices in medical equipment and monitoring moving parts in industrial equipment.

Description

Technical Field

[0001] The invention relates to the field of magnetic field positioning, and in particular to a high-frequency magnetic field positioning circuit and method based on harmonic effect. Background Art

[0002] High-precision positioning technology has important application value in medical equipment and industrial monitoring. Accurate positioning and status monitoring of in-vivo medical devices (such as catheters, stents, etc.) in the medical field are important means to ensure the success of surgery and patient safety. By real-time monitoring of the position and posture of these in-vivo devices, doctors can ensure the correct position and functional status of the equipment in the body, adjust the treatment plan in time, and improve the treatment effect. In addition, in industrial equipment, especially in situations involving high-precision mechanical movement, accurate positioning and monitoring of key moving parts are also important factors to ensure the normal operation of equipment and safe production. By real-time monitoring of these components, equipment failures and accidents can be effectively prevented, and production efficiency and product quality can be improved.

[0003] There are still some technical bottlenecks in the existing harmonic effect high-frequency magnetic field positioning methods. For example, in complex environments (such as in the body or in environments with a lot of metal interference), it is challenging to achieve high-precision real-time positioning. Magnetic field measurements are easily affected by the magnetization of surrounding materials, device heterogeneity, and multipath effects, which leads to increased measurement errors and reduced accuracy. In addition, the accuracy and noise resistance of existing devices such as magnetometers in smartphones vary from manufacturer to manufacturer, which further increases the difficulty of data consistency and positioning accuracy. Therefore, there is an urgent need for a circuit and method that can achieve high-precision real-time positioning in complex environments to meet the application needs of modern medicine and industry. In response to the above problems, a solution is proposed below. Summary of the invention

[0004] The purpose of the present invention is to provide a high-frequency magnetic field positioning circuit and method based on the harmonic effect, which has the advantages of being able to effectively suppress noise and interference, ensure positioning accuracy and stability under equipment heterogeneity conditions, and meet the needs of modern medicine and industry for high-precision positioning.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A high-frequency magnetic field positioning circuit based on harmonic effect comprises a magnetic field generating circuit, a magnetic field receiving circuit and a positioning circuit. The magnetic field generating circuit comprises an oscillator, an amplifier and a magnetic field generating coil. The oscillator is connected to the input end of the amplifier. The magnetic field receiving circuit comprises a frequency doubling circuit, a mixer, a filter, a receiving amplifier, a magnetic field receiving coil and a signal acquisition module. The input end of the frequency doubling circuit is connected to the oscillator, the magnetic field receiving coil is connected to the receiving amplifier, the output end of the receiving amplifier is connected to the filter, the output ends of the filter and the frequency doubling circuit are both connected to the mixer, and the output end of the mixer is connected to the signal acquisition module; the positioned circuit comprises a metal coil and a triode circuit connected to the metal coil.

[0006] Preferably, the oscillator is used to generate a high-frequency baseband signal, the high-frequency baseband signal is amplified by an amplifier, and drives a magnetic field generating coil to generate a baseband magnetic field signal.

[0007] Preferably, the metal coil in the located circuit receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current, the fundamental frequency induced current generates a second harmonic current through a triode circuit, and the second harmonic current drives the metal coil to generate a second harmonic magnetic field signal.

[0008] Preferably, the frequency doubling circuit receives a fundamental frequency magnetic field signal and a second harmonic magnetic field signal and transmits them to a mixer, where the fundamental frequency magnetic field signal and the second harmonic magnetic field signal are mixed with a second harmonic signal generated by an oscillator to output a DC signal.

[0009] A positioning method of a high-frequency magnetic field positioning circuit based on harmonic effect, comprising the following steps: S1: The magnetic field generating circuit generates a baseband signal, and drives the magnetic field generating coil to generate a baseband magnetic field signal; S2: The metal coil of the located circuit receives the fundamental frequency magnetic field signal and generates fundamental frequency induced current; S3: converts the fundamental frequency induced current into the second harmonic current through the triode circuit; S4: The magnetic field receiving circuit receives the fundamental frequency magnetic field signal and the second harmonic magnetic field signal, and mixes them to generate a DC output signal; S5: The DC output signal is collected through the signal acquisition module to calculate the position and posture of the located circuit.

[0010] Preferably, step S2 comprises the following steps: S2.1: The magnetic field generating circuit generates a high-frequency baseband signal through an oscillator. The high-frequency baseband signal is amplified by an amplifier and then transmitted to the magnetic field generating coil to generate a baseband magnetic field. S2.2: The fundamental frequency magnetic field generated by the magnetic field generating coil forms a distribution in the positioning space, and the distribution provides a fundamental frequency magnetic field signal for the positioned circuit.

[0011] Preferably, step S3 comprises the following steps: S3.1: The metal coil in the located circuit receives the fundamental frequency magnetic field signal, and generates fundamental frequency induced current in the metal coil; S3.2: The fundamental frequency induced current is processed by the triode circuit to generate a second harmonic current; the magnitude of the second harmonic current is proportional to the received fundamental frequency magnetic field signal, and the formula is as follows: ,in, is the second harmonic current, is the fundamental frequency induced current, is a constant related to the transistor characteristics.

[0012] Preferably, step S4 comprises the following steps: S4.1: The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the located circuit and simultaneously receives the fundamental frequency magnetic field signal; S4.2: The received fundamental frequency magnetic field signal and second harmonic magnetic field signal are mixed with the second harmonic signal generated by the oscillator at the mixer (8) to generate a DC output signal, which is collected by the signal collection module and used to calculate the position and posture of the located circuit.

[0013] Preferably, step S5 comprises the following steps: S5.1: Based on the received DC output signal, using the signal strength and phase information, calculate the distance and angle relationship between the located circuit and the magnetic field generating coil and the magnetic field receiving coil.

[0014] S5.2: Combine the signal information of multiple known coordinate points, and calculate the specific position and posture of the located circuit through triangulation and interpolation algorithm.

[0015] The beneficial effects of the present invention are: 1. The present invention provides a method for achieving high-precision positioning in complex metal environments and in vivo environments, which effectively suppresses noise and interference and significantly improves the accuracy and stability of positioning.

[0016] 2. The present invention uses the harmonic effect to achieve real-time positioning, can quickly calculate the target position and posture, and provide reliable data support for medical equipment and industrial monitoring.

[0017] 3. The present invention reduces the dependence on external devices, simplifies the operation process, improves the portability and practicality of the system, and is suitable for a variety of complex application scenarios.

[0018] 4. The present invention can maintain positioning accuracy under the condition of device heterogeneity, ensure data consistency between different devices, and enhance the versatility and adaptability of the system.

[0019] 5. The present invention reduces power consumption and improves the overall performance of the system through improved circuit design, making it more suitable for use in energy-constrained environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the magnetic field generation and receiving circuit parts of the high-frequency magnetic field positioning circuit based on the harmonic effect of the embodiment; Figure 2 It is a structural schematic diagram of a positioning circuit part of a high-frequency magnetic field positioning circuit based on harmonic effect in an embodiment; Figure 3 The figure is a flow chart of a high-frequency magnetic field positioning method based on harmonic effect according to an embodiment.

[0021] Figure numerals: 1. magnetic field generating circuit; 2. magnetic field receiving circuit; 3. positioning circuit; 4. oscillator; 5. amplifier; 6. magnetic field generating coil; 7. frequency multiplication circuit; 8. mixer; 9. filter; 10. receiving amplifier; 11. magnetic field receiving coil; 12. signal acquisition module; 13. metal coil; 14. transistor circuit. DETAILED DESCRIPTION

[0022] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same reference numerals.

[0023] like Figure 1 As shown, the magnetic field generating and receiving circuit parts of the high-frequency magnetic field positioning circuit based on harmonic effect in the specific implementation include a magnetic field generating circuit 1, a magnetic field receiving circuit 2 and a positioning circuit 3. The magnetic field generating circuit 1 generates a high-frequency signal of 1KHz-10MHz level by an oscillator 4 and amplifies it through an amplifier 5, and the output end of the amplifier 5 is connected to the magnetic field generating coil 6; the magnetic field receiving circuit 2 is composed of a frequency multiplication circuit 7 connected to the oscillator, a mixer 8, a filter 9, a receiving amplifier 10, a receiving coil 11 and a signal acquisition module 12.

[0024] The magnetic field generating circuit 1 generates a high frequency baseband signal of the order of 1 KHz-10 MHz through an oscillator 4 , and the signal is amplified by an amplifier 5 to drive the magnetic field generating coil 6 to generate a baseband magnetic field distribution.

[0025] The magnetic field receiving circuit 2 generates a second harmonic signal through the frequency multiplication circuit 7, and mixes the received baseband and second harmonic magnetic field signals with the second harmonic signal generated by the oscillator 4 in the mixer 8 to output a DC signal.

[0026] like Figure 2 As shown, the positioned circuit 3 is composed of a metal coil 13 and a triode circuit 14 connected to the metal coil.

[0027] The metal coil 13 in the positioned circuit 3 receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current. The fundamental frequency induced current generates a second harmonic current through the transistor circuit 14. The second harmonic current drives the metal coil 13 to generate a second harmonic magnetic field.

[0028] The positioning method generates a baseband signal by a magnetic field generating circuit, and after the signal is amplified, it drives the magnetic field transmitting coil to generate a baseband magnetic field distribution. The coil in the positioned circuit receives the baseband magnetic field signal to generate a baseband induced current, and the baseband induced current generates a second harmonic current through a triode circuit. The second harmonic current drives the positioned electrographic coil to generate a second harmonic magnetic field. The magnetic field receiving circuit receives the fundamental wave and the second harmonic magnetic field signal, and the received signal is mixed with the second harmonic signal of the oscillator at the mixer to generate a DC output signal. The output signal is collected by the acquisition circuit, which reflects the distance and angle relationship between the positioned circuit and the magnetic field receiving coil. A plurality of known coordinate magnetic field transmitting circuits, magnetic field receiving circuits and magnetic field transceiver coils are deployed at the edge of the positioned space, and the position and posture of the positioned circuit are calculated by collecting the signals generated by the positioned circuit and the coil.

[0029] like Figure 3 As shown, the positioning method includes the following steps: Step S1: The magnetic field generating circuit generates a baseband signal to drive the magnetic field generating coil to generate a baseband magnetic field.

[0030] Step S2: The metal coil in the located circuit receives the baseband magnetic field signal and generates a baseband induced current.

[0031] Step S3: converting the fundamental frequency induced current into the second harmonic current through a triode circuit.

[0032] Step S4: The magnetic field receiving circuit receives the fundamental wave and the second harmonic magnetic field signal, and mixes them to generate a DC output signal.

[0033] Step S5: The DC output signal is collected by the signal collection module to calculate the position and posture of the located circuit.

[0034] The specific steps of step S2 are: Step S2.1: The magnetic field generating circuit generates a baseband signal through an oscillator, and the signal is amplified by an amplifier and then transmitted to the magnetic field generating coil to generate a baseband magnetic field.

[0035] Step S2.2: The fundamental frequency magnetic field generated by the magnetic field generating coil forms a distribution in the positioning space, and the distribution provides a fundamental frequency magnetic field signal for the positioned circuit.

[0036] The specific steps of step S3 are: Step S3.1: The metal coil in the located circuit receives the fundamental frequency magnetic field signal, and generates a fundamental frequency induced current in the coil.

[0037] Step S3.2: The fundamental frequency induced current is processed by the triode circuit to generate a second harmonic current. The magnitude of the second harmonic current is proportional to the received fundamental frequency magnetic field signal, and the formula is as follows: ,in, is the second harmonic current, is the fundamental frequency induced current, is a constant related to the transistor characteristics.

[0038] The specific steps of step S4 are: Step S4.1: The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the located circuit and simultaneously receives the fundamental wave signal.

[0039] Step S4.2: The received fundamental wave and second harmonic magnetic field signals are mixed with the second harmonic signal generated by the oscillator at the mixer to generate a DC output signal, which is collected by the signal acquisition module and used to calculate the position and posture of the located circuit.

[0040] The specific steps of step S4 are: Step S5.1: Based on the received DC output signal, the distance and angle relationship between the located circuit and the magnetic field transceiver coil are calculated using the signal strength and phase information.

[0041] Step S5.2: Combining the signal information of multiple known coordinate points, the specific position and posture of the located circuit are calculated through triangulation and interpolation algorithm.

[0042] The method of the present invention places the circuit in the target environment. When the circuit is activated to generate a fundamental frequency magnetic field signal, the metal coil in the located circuit receives the signal and generates an induced current. This induced current is converted into a second harmonic current through a triode circuit, thereby generating a second harmonic magnetic field. The magnetic field receiving circuit receives the fundamental and second harmonic signals, and generates a DC output signal after mixing. By collecting and analyzing the DC signal, the position and posture of the located circuit can be accurately calculated.

[0043] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-frequency magnetic field positioning circuit based on harmonic effect, comprising a magnetic field generating circuit (1), a magnetic field receiving circuit (2) and a positioning circuit (3), characterized in that: The magnetic field generating circuit (1) comprises an oscillator (4), an amplifier (5) and a magnetic field generating coil (6); the oscillator (4) is connected to the input end of the amplifier (5); the magnetic field receiving circuit (2) comprises a frequency multiplication circuit (7), a mixer (8), a filter (9), a receiving amplifier (10), a magnetic field receiving coil (11) and a signal acquisition module (12); the input end of the frequency multiplication circuit (7) is connected to the oscillator (4); the magnetic field receiving coil (11) is connected to the receiving amplifier (10); the output end of the receiving amplifier (10) is connected to the filter (9); the output ends of the filter (9) and the frequency multiplication circuit (7) are both connected to the mixer (8); the output end of the mixer (8) is connected to the signal acquisition module (12); the circuit (3) comprises a metal coil (13) and a triode circuit (14) connected to the metal coil (13).

2. A high-frequency magnetic field positioning circuit based on harmonic effect according to claim 1, characterized in that: The oscillator (4) is used to generate a high-frequency baseband signal, which is amplified by an amplifier (5) and drives a magnetic field generating coil (6) to generate a baseband magnetic field signal.

3. A high-frequency magnetic field positioning circuit based on harmonic effect according to claim 2, characterized in that: The metal coil (13) in the positioned circuit (3) receives a fundamental frequency magnetic field signal and generates a fundamental frequency induced current. The fundamental frequency induced current generates a second harmonic current through a triode circuit (14). The second harmonic current drives the metal coil (13) to generate a second harmonic magnetic field signal.

4. A high-frequency magnetic field positioning circuit based on harmonic effect according to claim 3, characterized in that: The frequency multiplication circuit (7) receives the fundamental frequency magnetic field signal and the second harmonic magnetic field signal, and transmits them to the mixer (8), wherein the fundamental frequency magnetic field signal and the second harmonic magnetic field signal are mixed with the second harmonic signal generated by the oscillator (4) in the mixer (8) to output a DC signal.

5. A positioning method of a high-frequency magnetic field positioning circuit based on harmonic effect according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: The magnetic field generating circuit (1) generates a baseband signal and drives the magnetic field generating coil (6) to generate a baseband magnetic field signal; S2: The metal coil (13) in the located circuit (3) receives the fundamental frequency magnetic field signal and generates fundamental frequency induced current; S3: converting the fundamental frequency induced current into a second harmonic current through a triode circuit (14); S4: a magnetic field receiving circuit (2) receives a fundamental frequency magnetic field signal and a second harmonic magnetic field signal, and mixes them to generate a DC output signal; S5: The DC output signal is collected by the signal collection module (12), and the position and posture of the located circuit (3) are calculated.

6. The positioning method of the high-frequency magnetic field positioning circuit based on the harmonic effect according to claim 5 is characterized in that: The step S2 comprises the following steps: S2.1: The magnetic field generating circuit (1) generates a high-frequency baseband signal through an oscillator (4), and the high-frequency baseband signal is amplified by an amplifier (5) and then transmitted to a magnetic field generating coil (6) to generate a baseband magnetic field; S2.2: The fundamental frequency magnetic field generated by the magnetic field generating coil (6) forms a distribution in the positioning space, and the distribution provides a fundamental frequency magnetic field signal for the positioned circuit (3).

7. The positioning method of the high-frequency magnetic field positioning circuit based on the harmonic effect according to claim 6 is characterized in that: The step S3 comprises the following steps: S3.1: The metal coil (13) in the located circuit (3) receives the fundamental frequency magnetic field signal, and generates a fundamental frequency induced current in the metal coil (13); S3.2: The fundamental frequency induced current is processed by the triode circuit (14) to generate a second harmonic current; the magnitude of the second harmonic current is proportional to the received fundamental frequency magnetic field signal, and the formula is as follows: ,in, is the second harmonic current, is the fundamental frequency induced current, is a constant related to the transistor characteristics.

8. The positioning method of the high-frequency magnetic field positioning circuit based on harmonic effect according to claim 7 is characterized in that: The step S4 comprises the following steps: S4.1: The magnetic field receiving circuit (2) receives the second harmonic magnetic field signal generated by the located circuit (3) and simultaneously receives the fundamental frequency magnetic field signal; S4.2: The received fundamental frequency magnetic field signal and second harmonic magnetic field signal are mixed with the second harmonic signal generated by the oscillator (4) at the mixer (8) to generate a DC output signal, which is collected by the signal collection module (12) and used to calculate the position and posture of the located circuit (3).

9. The positioning method of the high-frequency magnetic field positioning circuit based on harmonic effect according to claim 8, characterized in that: The step S5 comprises the following steps: S5.1: Based on the received DC output signal, using the signal strength and phase information, calculate the distance and angle relationship between the located circuit (3) and the magnetic field generating coil (6) and the magnetic field receiving coil (11). 10.S5.2: Combine the signal information of multiple known coordinate points and calculate the specific position and posture of the located circuit (3) through triangulation and interpolation algorithm.

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