A high frequency magnetic field positioning circuit and method based on harmonic effects

Abstract

The application discloses a high-frequency magnetic field positioning circuit and method based on harmonic effect, which is composed of a magnetic field generating circuit, a magnetic field receiving circuit and a positioning circuit. The positioning method generates a fundamental frequency magnetic field signal by the magnetic field generating circuit. The positioning circuit generates a fundamental frequency induced current and a second harmonic magnetic field signal. The second harmonic magnetic field signal is mixed with an oscillator second harmonic signal in a mixer to generate a direct current output signal. The output signal reflects the distance and angle relationship between the positioning circuit and the magnetic field receiving coil. A plurality of known coordinate magnetic field transmitting circuits, magnetic field receiving circuits and magnetic field receiving coils are arranged at the edge of the positioning space. The position and posture of the positioning circuit are calculated by collecting the signal generated by the positioning circuit. The circuit and method are used for monitoring the position and state of an in-vivo medical device in a medical device and monitoring a moving part in an industrial device.

Description

Technical Field

[0001] This 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 effects. Background Technology

[0002] High-precision positioning technology has significant applications in medical equipment and industrial monitoring. In the medical field, accurate positioning and status monitoring of in-vivo medical devices (such as catheters and stents) are crucial for ensuring surgical success and patient safety. Real-time monitoring of the position and orientation of these devices allows doctors to ensure their correct placement and functional status within the body, enabling timely adjustments to treatment plans and improved outcomes. Furthermore, in industrial equipment, particularly in applications involving high-precision mechanical motion, accurate positioning and monitoring of critical moving components are essential for ensuring normal equipment operation and safe production. Real-time monitoring of these components can effectively prevent equipment failures and accidents, improving production efficiency and product quality.

[0003] Existing high-frequency magnetic field positioning methods based on harmonic effects still face several technical bottlenecks. For example, achieving high-precision real-time positioning in complex environments (such as inside the body or in environments with significant metal interference) presents challenges. Magnetic field measurements are easily affected by the magnetization of surrounding materials, device heterogeneity, and multipath effects, leading to increased measurement errors and reduced accuracy. Furthermore, existing devices, such as magnetometers in smartphones, exhibit varying accuracy and noise immunity across different manufacturers, further complicating data consistency and positioning accuracy. Therefore, there is an urgent need for a circuit and method capable of achieving high-precision real-time positioning in complex environments to meet the application needs of modern medicine and industry. To address these issues, a solution is proposed below. Summary of the Invention

[0004] The purpose of this invention is to provide a high-frequency magnetic field positioning circuit and method based on harmonic effects, which has the advantages of effectively suppressing noise and interference, ensuring positioning accuracy and stability under heterogeneous equipment conditions, and meeting the needs of modern medicine and industry for high-precision positioning.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A high-frequency magnetic field positioning circuit based on harmonic effects includes a magnetic field generating circuit, a magnetic field receiving circuit, and a positioning circuit. The magnetic field generating circuit includes an oscillator, an amplifier, and a magnetic field generating coil. The oscillator is connected to the input terminal of the amplifier. The magnetic field receiving circuit includes a frequency multiplier circuit, a mixer, a filter, a receiving amplifier, a magnetic field receiving coil, and a signal acquisition module. The input terminal of the frequency multiplier circuit is connected to the oscillator. The magnetic field receiving coil is connected to the receiving amplifier. The output terminal of the receiving amplifier is connected to the filter. The output terminals of the filter and the frequency multiplier circuit are both connected to the mixer. The output terminal of the mixer is connected to the signal acquisition module. The positioning circuit includes a metal coil and a transistor circuit connected to the metal coil.

[0007] Preferably, the oscillator is used to generate a high-frequency fundamental frequency signal, which is amplified by an amplifier and drives a magnetic field generating coil to generate a fundamental frequency magnetic field signal.

[0008] Preferably, the metal coil in the positioning 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 transistor circuit, and the second harmonic current drives the metal coil to generate a second harmonic magnetic field signal.

[0009] Preferably, the frequency multiplier circuit receives the fundamental frequency magnetic field signal and the second harmonic magnetic field signal, and transmits them to the mixer. The fundamental frequency magnetic field signal and the second harmonic magnetic field signal are mixed with the second harmonic signal generated by the oscillator in the mixer to output a DC signal.

[0010] A positioning method based on a high-frequency magnetic field positioning circuit with harmonic effects includes the following steps:

[0011] S1: The magnetic field generating circuit generates a fundamental frequency signal, which drives the magnetic field generating coil to generate a fundamental frequency magnetic field signal;

[0012] S2: The metal coil of the positioning circuit receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current;

[0013] S3: Converts the fundamental frequency induced current into the second harmonic current through a transistor circuit;

[0014] S4: The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the positioning circuit. At the same time, the frequency multiplier circuit converts the fundamental frequency signal generated by the oscillator into a second harmonic reference signal, and performs frequency mixing processing on the two second harmonic signals in the mixer to generate a DC output signal.

[0015] S5: Acquire DC output signals through the signal acquisition module to calculate the position and attitude of the positioning circuit.

[0016] Preferably, step S2 includes the following steps:

[0017] S2.1: The magnetic field generating circuit generates a high-frequency fundamental frequency signal through an oscillator. The high-frequency fundamental frequency signal is amplified by an amplifier and then transmitted to the magnetic field generating coil to generate a fundamental frequency magnetic field.

[0018] S2.2: The fundamental frequency magnetic field generated by the magnetic field generating coil forms a distribution in the positioning space, and this distribution provides the fundamental frequency magnetic field signal for the positioning circuit.

[0019] Preferably, step S3 includes the following steps:

[0020] S3.1: The metal coil in the positioning circuit receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current in the metal coil;

[0021] S3.2: The fundamental frequency induced current is processed by a transistor circuit to generate a second harmonic current; the magnitude of the second harmonic current is proportional to the received fundamental frequency magnetic field signal, as shown in the following formula: ,in, It is the second harmonic current. For fundamental frequency induced current, This is a constant related to the characteristics of the transistor.

[0022] Preferably, step S4 includes the following steps:

[0023] S4.1: The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the positioning circuit, and processes the signal through a receiving amplifier and a filter;

[0024] S4.2: The frequency multiplier circuit converts the fundamental frequency signal generated by the oscillator into a second harmonic reference signal and inputs it into the mixer. Simultaneously, the processed second harmonic magnetic field signal is also input into the mixer. The two second harmonic signals are mixed in the mixer to generate a DC output signal. This DC signal is acquired by the signal acquisition module and used to calculate the position and attitude of the positioning circuit.

[0025] Preferably, step S5 includes the following steps:

[0026] S5.1: Based on the received DC output signal, use the signal strength and phase information to calculate the distance and angle relationship between the positioning circuit and the magnetic field generating coil and the magnetic field receiving coil.

[0027] S5.2: Combining signal information from multiple known coordinate points, the specific position and orientation of the positioning circuit are calculated using triangulation and interpolation algorithms.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. This invention provides a method for achieving high-precision positioning in complex metallic and internal environments, which effectively suppresses noise and interference and significantly improves the accuracy and stability of positioning.

[0030] 2. This invention utilizes the harmonic effect to achieve real-time positioning, enabling rapid calculation of target position and attitude, and providing reliable data support for medical equipment and industrial monitoring.

[0031] 3. This invention reduces reliance on external devices, simplifies the operation process, and improves the portability and practicality of the system, making it suitable for a variety of complex application scenarios.

[0032] 4. The present invention can maintain positioning accuracy even under conditions of equipment heterogeneity, ensure data consistency between different devices, and enhance the versatility and adaptability of the system.

[0033] 5. This 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. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the magnetic field generating and receiving circuit sections of a high-frequency magnetic field positioning circuit based on harmonic effects, as shown in the embodiment.

[0035] Figure 2 This is a schematic diagram of the positioning circuit portion of a high-frequency magnetic field positioning circuit based on harmonic effects, as shown in the embodiment.

[0036] Figure 3 This is a flowchart of a high-frequency magnetic field positioning method based on harmonic effects, as an example.

[0037] Figure reference 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 multiplier circuit; 8. Mixer; 9. Filter; 10. Receiving amplifier; 11. Magnetic field receiving coil; 12. Signal acquisition module; 13. Metal coil; 14. Transistor circuit. Detailed Implementation

[0038] The following description is merely a preferred embodiment of the present invention, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of the present invention should be protected by the present invention. Identical components are indicated by the same reference numerals.

[0039] like Figure 1As shown, the magnetic field generating and receiving circuits of the high-frequency magnetic field positioning circuit based on harmonic effects 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 in the 1KHz-10MHz range using an oscillator 4, which is amplified by an amplifier 5. The output of the amplifier 5 is connected to a magnetic field generating coil 6. The magnetic field receiving circuit 2 consists of a frequency multiplier 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.

[0040] The magnetic field generating circuit 1 generates a high-frequency fundamental frequency signal in the range of 1KHz-10MHz through the oscillator 4. This signal is amplified by the amplifier 5 and drives the magnetic field generating coil 6 to generate a fundamental frequency magnetic field distribution.

[0041] The magnetic field receiving circuit 2 generates a second harmonic signal through the frequency multiplier circuit 7, and mixes the second harmonic reference signal generated by the frequency multiplier circuit 7 with the second harmonic magnetic field signal received by the magnetic field receiving coil 11 in the mixer 8 to output a DC signal.

[0042] like Figure 2 As shown, the positioning circuit 3 consists of a metal coil 13 and a transistor circuit 14 connected to the metal coil.

[0043] The metal coil 13 in the positioning 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, and the second harmonic current drives the metal coil 13 to generate a second harmonic magnetic field.

[0044] This positioning method uses a magnetic field generating circuit to produce a fundamental frequency signal. This signal is amplified and drives a magnetic field transmitting coil to generate a fundamental frequency magnetic field distribution. The coil in positioning circuit 3 receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current. This induced current passes through a transistor circuit to generate a second harmonic current. This second harmonic current drives the coil in positioning circuit 3 to generate a second harmonic magnetic field. The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the positioning circuit. The received signal is mixed with the second harmonic signal from the oscillator at a mixer to generate a DC output signal. This output signal is acquired by an acquisition circuit, reflecting the distance and angular relationship between the positioning circuit and the magnetic field transmitting and receiving coil. Multiple magnetic field transmitting circuits, magnetic field receiving circuits, and magnetic field transceiver coils with known coordinates are deployed at the edge of the positioning space. The position and attitude of the positioning circuit are calculated by acquiring the signals generated by the positioning circuit and the coils.

[0045] like Figure 3 As shown, the positioning method includes the following steps:

[0046] Step S1: The magnetic field generating circuit generates a fundamental frequency signal, which drives the magnetic field generating coil to generate a fundamental frequency magnetic field.

[0047] Step S2: The metal coil in the positioning circuit receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current.

[0048] Step S3: Convert the fundamental frequency induced current into a second harmonic current through a transistor circuit.

[0049] Step S4: The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the positioning circuit. At the same time, the frequency multiplier circuit converts the fundamental frequency signal generated by the oscillator into a second harmonic reference signal, and performs frequency mixing processing on the two second harmonic signals in the mixer to generate a DC output signal.

[0050] Step S5: Acquire the DC output signal through the signal acquisition module and calculate the position and attitude of the positioning circuit.

[0051] The specific steps of step S2 are as follows:

[0052] Step S2.1: The magnetic field generating circuit generates a fundamental frequency signal through an oscillator. The signal is amplified by an amplifier and then transmitted to the magnetic field generating coil to generate a fundamental frequency magnetic field.

[0053] Step S2.2: The fundamental frequency magnetic field generated by the magnetic field generating coil forms a distribution in the positioning space, and this distribution provides the fundamental frequency magnetic field signal for the positioning circuit.

[0054] Step S3 is as follows:

[0055] Step S3.1: The metal coil in the positioning circuit receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current in the coil.

[0056] Step S3.2: The fundamental frequency induced current is processed by a transistor circuit to generate a second harmonic current. The magnitude of the second harmonic current is proportional to the received fundamental frequency magnetic field signal, as shown in the following formula: ,in, It is the second harmonic current. For fundamental frequency induced current, This is a constant related to the characteristics of the transistor.

[0057] Step S4 is as follows:

[0058] Step S4.1: The magnetic field receiving circuit receives the second harmonic magnetic field signal generated by the positioning circuit, and processes the signal through the receiving amplifier and filter.

[0059] Step S4.2: The frequency multiplier circuit converts the fundamental frequency signal generated by the oscillator into a second harmonic reference signal and inputs it into the mixer. Simultaneously, the processed second harmonic magnetic field signal is also input into the mixer. The two second harmonic signals are mixed in the mixer to generate a DC output signal. This DC signal is acquired by the signal acquisition module and used to calculate the position and attitude of the positioning circuit.

[0060] Step S5 is as follows:

[0061] Step S5.1: Based on the received DC output signal, use the signal strength and phase information to calculate the distance and angle relationship between the positioning circuit and the magnetic field transceiver coil.

[0062] Step S5.2: Combining the signal information from multiple known coordinate points, calculate the specific position and orientation of the positioning circuit using triangulation and interpolation algorithms.

[0063] The method of this invention places the circuit in the target environment. When the activation circuit generates a fundamental frequency magnetic field signal, the metal coil in the positioning circuit receives the signal and generates an induced current. This induced current is converted into a second harmonic current through a transistor circuit, thereby generating a second harmonic magnetic field. The magnetic field receiving circuit receives the fundamental and second harmonic signals, mixes them, and generates a DC output signal. By acquiring and analyzing this DC signal, the position and attitude of the positioning circuit can be accurately calculated.

[0064] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely 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 within the protection scope of the present invention.

Claims

1. A high-frequency magnetic field positioning circuit based on harmonic effects, 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) includes an oscillator (4), an amplifier (5), and a magnetic field generating coil (6). The oscillator (4) is connected to the input terminal of the amplifier (5). The magnetic field receiving circuit (2) includes a frequency multiplier 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 terminal of the frequency multiplier circuit (7) is connected to the oscillator (4). The magnetic field receiving coil (11) is connected to the receiving amplifier (10). The output terminal of the receiving amplifier (10) is connected to the filter (9). The output terminals of the filter (9) and the frequency multiplier circuit (7) are both connected to the mixer (8). The output terminal of the mixer (8) is connected to the signal acquisition module (12). The positioning circuit (3) includes a metal coil (13) and a transistor circuit (14) connected to the metal coil (13). The metal coil (13) in the positioning 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 signal. The frequency multiplier circuit (7) receives the fundamental frequency signal generated by the oscillator (4) and generates a second harmonic signal, and transmits the second harmonic signal to the mixer (8); the magnetic field receiving coil (11) receives the second harmonic magnetic field signal generated by the positioning circuit (3), and after being processed by the receiving amplifier (10) and the filter (9), it is input into the mixer (8). The mixer (8) performs frequency mixing processing on the second harmonic signal generated by the frequency multiplier circuit (7) and the second harmonic magnetic field signal generated by the positioning circuit (3) received by the magnetic field receiving coil (11) and outputs a DC signal.

2. The 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 base frequency signal, which is amplified by an amplifier (5) and drives a magnetic field generating coil (6) to generate a base frequency magnetic field signal.

3. A positioning method based on a high-frequency magnetic field positioning circuit according to any one of claims 1-2, characterized in that, Includes the following steps: S1: The magnetic field generating circuit (1) generates a fundamental frequency signal, which drives the magnetic field generating coil (6) to generate a fundamental frequency magnetic field signal; S2: The metal coil (13) in the positioning circuit (3) receives the fundamental frequency magnetic field signal and generates a fundamental frequency induced current; S3: The fundamental frequency induced current is converted into the second harmonic current through the transistor circuit (14); S4: The magnetic field receiving circuit (2) receives the second harmonic magnetic field signal generated by the positioning circuit (3). At the same time, the frequency multiplier circuit (7) converts the fundamental frequency signal generated by the oscillator (4) into a second harmonic reference signal. The mixer (8) performs frequency mixing processing on the second harmonic magnetic field signal generated by the positioning circuit (3) and the second harmonic reference signal converted by the frequency multiplier circuit (7) received by the magnetic field receiving circuit (2) to generate a DC output signal. S5: The DC output signal is acquired through the signal acquisition module (12) to calculate the position and attitude of the positioning circuit (3).

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

5. The positioning method of a high-frequency magnetic field positioning circuit based on harmonic effect according to claim 4, characterized in that, Step S3 includes the following steps: S3.1: The metal coil (13) in the positioning 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 transistor circuit (14) to generate the second harmonic current; the magnitude of the second harmonic current is proportional to the received fundamental frequency magnetic field signal, as shown in the following formula: ,in, It is the second harmonic current. For fundamental frequency induced current, This is a constant related to the characteristics of the transistor.

6. The positioning method of a high-frequency magnetic field positioning circuit based on harmonic effect according to claim 5, characterized in that, Step S4 includes the following steps: S4.1: The magnetic field receiving coil (11) receives the second harmonic magnetic field signal generated by the positioning circuit (3), and performs signal processing through the receiving amplifier (10) and the filter (9); S4.2: The frequency multiplier circuit (7) converts the fundamental frequency signal generated by the oscillator (4) into a second harmonic reference signal and inputs it into the mixer (8). At the same time, the processed second harmonic magnetic field signal is input into the mixer (8). The two second harmonic signals are mixed in the mixer (8) to generate a DC output signal. This DC signal is acquired by the signal acquisition module (12) and used to calculate the position and attitude of the positioning circuit (3).

7. The positioning method of a high-frequency magnetic field positioning circuit based on harmonic effect according to claim 6, characterized in that, Step S5 includes the following steps: S5.1: Based on the received DC output signal, use the signal strength and phase information to calculate the distance and angle relationship between the positioning circuit (3) and the magnetic field generating coil (6) and the magnetic field receiving coil (11); S5.2: Combine the signal information of multiple known coordinate points, and use the triangulation method and interpolation algorithm to calculate the specific position and attitude of the positioning circuit (3).

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