Short-wave antenna tuning method and device

Abstract

The invention provides a short-wave antenna tuning method which is applied to a short-wave antenna tuning system, and the method comprises the steps: obtaining the measurement current and the measurement voltage of a transmitting circuit, and the transmitting circuit is composed of a matching network and an antenna. A measured impedance is determined based on the measured current and the measured voltage. If the measurement impedance cannot enable the antenna to transmit the communication signal according to the preset transmission frequency, the matching network is controlled by a tuning unit to perform at least three stages of short-wave antenna tuning to obtain tuning impedance, and the tuning impedance is used for enabling the antenna to transmit the communication signal according to the preset transmission frequency. The short-wave antenna tuning in the first stage is used for enabling the impedance of the transmitting circuit to be located in a tunable area, the short-wave antenna tuning in the second stage is used for enabling the actual admittance value of the transmitting circuit to be close to a preset admittance value, and the short-wave antenna tuning in the third stage is used for enabling the actual standing-wave ratio of the transmitting circuit to be close to a preset standing-wave ratio. The method provided by the invention can finish tuning with high precision.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a shortwave antenna tuning method and device. Background Art

[0002] With the continuous development of science and technology, shortwave communication has been widely used in emergency communication and other fields. In shortwave communication systems, the input impedance of the antenna changes dramatically with frequency, so the impedance matching of the antenna cannot be achieved through an impedance matching network with fixed parameters. The shortwave antenna tuner is an impedance matching network that connects the transmitter and the antenna. It can match the impedance between the transmitter and the antenna, so that the antenna has the maximum radiation power at any frequency.

[0003] The development of shortwave antenna tuners has gone through a process from manual tuning to automatic tuning, in which automatic tuning mainly includes analog automatic tuning. Analog automatic shortwave antenna tuners use electric devices to control continuously adjustable variable capacitors and inductors to achieve matching. However, the existing shortwave antenna tuning methods have poor accuracy.

[0004] Therefore, how to improve the tuning accuracy of shortwave antennas has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] Based on the above problems, the present application provides a shortwave antenna tuning method and device to improve the tuning accuracy of the shortwave antenna.

[0006] The present application provides a shortwave antenna tuning system, the system comprising:

[0007] Radio stations, shortwave antenna tuners and antennas;

[0008] The shortwave antenna tuner comprises a tuning unit, a measuring circuit and a matching network;

[0009] The radio station is connected to the matching network, the radio station is connected to the tuning unit, the tuning unit is connected to the measuring circuit, the matching network is connected to the measuring circuit, and the matching network is connected to the antenna;

[0010] The radio station is used to control the shortwave antenna tuner and to apply a radio frequency signal to the antenna according to a preset transmission frequency;

[0011] The measuring circuit is used to collect the voltage and current of the transmitting circuit, and the transmitting circuit is composed of the matching network and the antenna;

[0012] The matching network includes a plurality of capacitors and a plurality of inductors, and the connection states of the capacitors and inductors of the matching network are controlled by the tuning unit;

[0013] The antenna is used for sending and receiving communication signals.

[0014] In a possible implementation, the matching network includes:

[0015] A first capacitor group, a second capacitor group, a third capacitor group and an inductor group;

[0016] The second capacitor group, the inductor group and the antenna are connected in series, and the first capacitor group and the third capacitor group are connected in parallel.

[0017] The present application also provides a shortwave antenna tuning method, which is applied to the above shortwave antenna tuning system, and the method comprises:

[0018] Obtaining a measured current and a measured voltage of a transmitting circuit, wherein the transmitting circuit is composed of a matching network and an antenna;

[0019] determining a measurement impedance based on the measurement current and the measurement voltage;

[0020] If the measured impedance cannot enable the antenna to transmit a communication signal at a preset transmission frequency, the matching network is controlled by a tuning unit to perform at least three stages of shortwave antenna tuning to obtain a tuned impedance, wherein the tuned impedance is used to enable the antenna to transmit a communication signal at a preset transmission frequency, the shortwave antenna tuning of the first stage is used to make the impedance of the transmitting circuit located in a tunable zone, the shortwave antenna tuning of the second stage is used to make the actual admittance value of the transmitting circuit close to the preset admittance value, and the shortwave antenna tuning of the third stage is used to make the actual standing wave ratio of the transmitting circuit close to the preset standing wave ratio.

[0021] In a possible implementation, the shortwave antenna tuning in the first stage is performed in the following manner:

[0022] The capacitance value of the second capacitor group connected to the matching network and the capacitance value of the third capacitor group connected to the matching network are adjusted so that the impedance of the transmitting circuit is within the tunable region.

[0023] In a possible implementation, the shortwave antenna tuning in the second stage is performed in the following manner:

[0024] The inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network are adjusted so that the actual admittance value of the transmitting circuit is close to the preset admittance value.

[0025] In a possible implementation manner, the preset admittance value is determined by the following method:

[0026] Taking the reference admittance value as a reference, a left-right scan is performed near the reference admittance value to determine the preset admittance value.

[0027] In a possible implementation, the shortwave antenna tuning in the third stage is performed in the following manner:

[0028] The inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network are adjusted in minimum steps, so that the standing wave ratio of the transmitting circuit is close to the preset standing wave ratio.

[0029] The present application also provides an electronic device, the electronic device comprising a processor and a memory:

[0030] The memory is used to store a computer program and transmit the computer program to the processor;

[0031] The processor is used to execute the steps of the above shortwave antenna tuning method according to the instructions in the computer program.

[0032] The present application also provides a computer-readable storage medium, which is used to store a computer program. When the computer program is executed by an electronic device, the steps of the shortwave antenna tuning method are implemented.

[0033] Compared with the prior art, this application has the following beneficial effects:

[0034] The shortwave antenna tuning method provided by the present application introduces a three-stage tuning process. The present application can more accurately control the impedance matching between the antenna and the transmitting circuit. By adjusting the three-stage tuning of impedance, admittance value and standing wave ratio, the tuning accuracy is greatly improved to ensure that the antenna has a better communication effect. Through a multi-stage dynamic tuning mechanism, the present application can monitor and adjust the impedance state of the transmitting circuit in real time, so that it always maintains the best working efficiency when the frequency changes. The shortwave antenna tuning method of the present application continuously measures the current and voltage, monitors the state of the transmitting circuit in real time, and can dynamically adjust the tuning process to ensure the stability and reliability of the system. This feature makes this method particularly suitable for fields with high stability requirements such as emergency communications, and enhances the system's response capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 A shortwave antenna tuning system provided for an embodiment of the application;

[0037] Figure 2 A schematic diagram of a circuit structure of a matching network provided in an embodiment of the present application;

[0038] Figure 3 A flow chart of a shortwave antenna tuning method provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of a tunable region provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] As described above, the development of antenna tuning has gone through a process from manual tuning to automatic tuning, in which automatic tuning mainly includes analog automatic tuning. Analog automatic shortwave antenna tuners use electric devices to control continuously adjustable variable capacitors and inductors to achieve matching. However, the existing shortwave antenna tuning methods have poor accuracy.

[0041] After research, it was found that the matching achieved by controlling the continuously adjustable variable capacitor and inductor through an electric device may not be able to be tuned at first. Since there is a non-tunable area in the shortwave antenna tuning, the existing tuning method has the possibility of working from the non-tunable area. In addition, since the continuously adjustable variable capacitor and inductor are linearly adjustable, and the antenna of the shortwave antenna tuner itself has fluctuations, when tuning, the linear adjustment of the continuously adjustable variable capacitor and inductor will amplify the impact of the fluctuation of the shortwave antenna tuner itself on the communication, which ultimately leads to the poor accuracy of the existing shortwave antenna tuning method.

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Figure 1 A shortwave antenna tuning system is provided in an embodiment of the present application, the system comprising:

[0044] Radio station, shortwave antenna tuner (referred to as antenna tuner in the figure) and antenna;

[0045] The shortwave antenna tuner includes a tuning unit, a measuring circuit and a matching network;

[0046] The radio station and the matching network are connected through a radio frequency line, the radio station and the tuning unit are connected through a serial port line, the tuning unit and the measuring circuit are connected through a serial port line, the matching network and the measuring circuit are connected through an IO port, the matching network and the antenna form a transmitting circuit, and the matching network and the antenna are connected through a circuit.

[0047] The radio station is used to control the shortwave antenna tuner and to apply a radio frequency signal to the antenna according to a preset transmission frequency. The measuring circuit is used to collect the voltage and current of the transmission circuit. The matching network includes a plurality of capacitors and a plurality of inductors, and the connection state of the capacitors and inductors of the matching network is controlled by the tuning unit. The antenna is used to send and receive communication signals.

[0048] Figure 2 A schematic diagram of a matching network circuit structure provided in this application, Figure 2 In the embodiment, a first capacitor group, a second capacitor group, a third capacitor group and an inductor group are included.

[0049] The first capacitor group is composed of C1-C10, the second capacitor group is composed of C11-C13, the third capacitor group is composed of C14-C15, and the inductor group is composed of L1-L11.

[0050] The second capacitor group, the inductor group and the antenna are connected in series, and the first capacitor group and the third capacitor group are connected in parallel.

[0051] It can be understood that the method provided in the present application can be applied to the above-mentioned system, which is a system that can perform a shortwave antenna tuning method.

[0052] Figure 3 A flow chart of a shortwave antenna tuning method provided in the present application, the method comprising the following steps:

[0053] S101: Obtaining a measured current and a measured voltage of a transmitting circuit, where the transmitting circuit is composed of a matching network and an antenna.

[0054] The radio station can control the measuring circuit to obtain the measuring current and measuring voltage of the transmitting circuit through the measuring circuit. The transmitting circuit is composed of a matching network and an antenna.

[0055] S102: Determine a measurement impedance based on the measurement current and the measurement voltage.

[0056] The station can calculate the measured impedance of the transmitting circuit based on the measured current and the measured voltage obtained by the measuring circuit.

[0057] S103: If the measured impedance cannot enable the antenna to transmit a communication signal at a preset transmission frequency, the tuning unit controls the matching network to perform at least three stages of shortwave antenna tuning to obtain a tuned impedance.

[0058] If the measured impedance cannot enable the antenna to transmit communication signals at the preset transmission frequency, the radio station controls the matching network through the tuning unit to perform at least three stages of shortwave antenna tuning to obtain a tuned impedance, which is used to enable the antenna to transmit communication signals at the preset transmission frequency.

[0059] The first stage of shortwave antenna tuning is used to make the impedance of the transmitting circuit located in the tunable zone, the second stage of shortwave antenna tuning is used to make the actual admittance value of the transmitting circuit close to the preset admittance value, and the third stage of shortwave antenna tuning is used to make the actual standing wave ratio of the transmitting circuit close to the preset standing wave ratio.

[0060] In one possible implementation, the first stage of shortwave antenna tuning can be performed as follows:

[0061] The capacitance value of the second capacitor group connected to the matching network and the capacitance value of the third capacitor group connected to the matching network are adjusted so that the impedance of the transmitting circuit is within the tunable region.

[0062] Figure 4 A schematic diagram of a tunable region provided in this application, Figure 4 is a Smith chart, Figure 4 It is divided into three regions: high-resistance non-tunable region, low-resistance non-tunable region and tunable region. Figure 4 In the diagram, the right circular line is the real part of impedance, the radiating line from the right is the imaginary part of impedance, the left circular line is the real part of admittance, and the radiating line on the left is the imaginary part of admittance. The imaginary parts of impedance and admittance are divided into positive and negative. The imaginary part of impedance is positive above the horizontal line and negative below the horizontal line. The imaginary part of admittance is opposite to impedance. The unit of impedance is ohm, and the unit of admittance is siemens. The intersection indicated by the arrow is in the tunable area, and the impedance value is 25-j10Ω

[0063] In one possible implementation, the second stage of shortwave antenna tuning can be performed as follows:

[0064] The inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network are adjusted so that the actual admittance value of the transmitting circuit is close to the preset admittance value.

[0065] Due to the operating frequency, working environment, parasitic impedance and other reasons, when adjusting the inductance group in the second stage of the shortwave antenna tuning process, it is not possible to strictly follow the situation where the admittance is equal to the reference admittance value, and the reference admittance value is generally 0.02. Therefore, this application proposes a method of determining the preset admittance value by performing left and right scanning calculations with 0.02 as the center point.

[0066] In addition, the present application can also divide the shortwave antenna tuning process of at least three stages into multiple times. For example, a complete shortwave antenna tuning has three stages. After each period of shortwave antenna tuning, the tuning is stopped. During the time of stopping tuning, the radio station can detect whether the measured impedance at this time can make the antenna transmit the communication signal according to the preset transmission frequency. If it can, the tuning is completed. If not, the tuning is continued for a period of time. The duration of each tuning can be set to 3 seconds.

[0067] When using the above-mentioned time-division tuning method, the preset admittance value can be changed accordingly during each tuning time. For example, taking the operating frequency of 10MHz as an example, the reference admittance value is 0.02, and the tuning fails within the first 3 seconds of tuning. In the next 3 seconds of tuning, the admittance can be close to 0.019 (preset admittance value) as the reference for tuning; if it fails, continue to try tuning with the admittance close to 0.021 (preset admittance value) as the reference; if it fails, continue to try tuning with the admittance close to 0.018 (preset admittance value) as the reference; and so on. The step and range of the modified reference can be adjusted according to actual experience, and the step of the reference can also be modified according to the current operating frequency.

[0068] When adjusting the inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network, adjusting the inductor group can make the actual admittance value close to 0.02, and adjusting the first capacitor group can make the actual admittance value away from 0.02.

[0069] In one possible implementation, the third stage of shortwave antenna tuning can be performed as follows:

[0070] The radio station can adjust the inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network in the smallest step, so that the standing wave ratio of the transmitting circuit is close to the preset standing wave ratio.

[0071] In one possible implementation, taking the operating frequency of 10 MHz as an example, after the second stage of shortwave antenna tuning, the standing wave ratio of the transmitting circuit will be between 1.5 and 2. Although communication can be carried out at this time, the quality of communication is poor. The closer the standing wave ratio is to 1, the better the communication effect. The radio station can adjust the inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network with the smallest step, so as to make the standing wave ratio as close to 1 as possible, thereby improving the communication effect.

[0072] The shortwave antenna tuning method provided by the present application introduces a three-stage tuning process. The present application can more accurately control the impedance matching between the antenna and the transmitting circuit. By adjusting the three-stage tuning of impedance, admittance value and standing wave ratio, the tuning accuracy is greatly improved to ensure that the antenna has a better communication effect. Through a multi-stage dynamic tuning mechanism, the present application can monitor and adjust the impedance state of the transmitting circuit in real time, so that it always maintains the best working efficiency when the frequency changes. The shortwave antenna tuning method of the present application continuously measures the current and voltage, monitors the state of the transmitting circuit in real time, and can dynamically adjust the tuning process to ensure the stability and reliability of the system. This feature makes this method particularly suitable for fields with high stability requirements such as emergency communications, and enhances the system's response capabilities.

[0073] An embodiment of the present application also provides a shortwave antenna tuning device, wherein the device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device performs the steps of the shortwave antenna tuning method described in any embodiment of the present application.

[0074] In practical applications, the computer-readable storage medium may be any combination of one or more computer-readable media, which may be a computer-readable signal medium or a computer-readable storage medium.

[0075] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0076] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0077] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0078] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0079] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is merely schematic, in which the unit described as a separate component may or may not be physically separated, and the component prompted as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0080] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A shortwave antenna tuning system, characterized in that: include: Radio stations, shortwave antenna tuners and antennas; The shortwave antenna tuner comprises a tuning unit, a measuring circuit and a matching network; The radio station is connected to the matching network, the radio station is connected to the tuning unit, the tuning unit is connected to the measuring circuit, the matching network is connected to the measuring circuit, and the matching network is connected to the antenna; The radio station is used to control the shortwave antenna tuner and to apply a radio frequency signal to the antenna according to a preset transmission frequency; The measuring circuit is used to collect the voltage and current of the transmitting circuit, and the transmitting circuit is composed of the matching network and the antenna; The matching network includes a plurality of capacitors and a plurality of inductors, and the connection states of the capacitors and inductors of the matching network are controlled by the tuning unit; The antenna is used for sending and receiving communication signals.

2. The system according to claim 1, characterized in that The matching network comprises: A first capacitor group, a second capacitor group, a third capacitor group and an inductor group; The second capacitor group, the inductor group and the antenna are connected in series, and the first capacitor group and the third capacitor group are connected in parallel.

3. A shortwave antenna tuning method, applied to the shortwave antenna tuning system according to claim 2, characterized in that: include: Obtaining a measured current and a measured voltage of a transmitting circuit, wherein the transmitting circuit is composed of a matching network and an antenna; determining a measurement impedance based on the measurement current and the measurement voltage; If the measured impedance cannot enable the antenna to transmit a communication signal at a preset transmission frequency, the matching network is controlled by a tuning unit to perform at least three stages of shortwave antenna tuning to obtain a tuned impedance, wherein the tuned impedance is used to enable the antenna to transmit a communication signal at a preset transmission frequency, the shortwave antenna tuning of the first stage is used to make the impedance of the transmitting circuit located in a tunable zone, the shortwave antenna tuning of the second stage is used to make the actual admittance value of the transmitting circuit close to the preset admittance value, and the shortwave antenna tuning of the third stage is used to make the actual standing wave ratio of the transmitting circuit close to the preset standing wave ratio.

4. The method according to claim 3, characterized in that The first stage of shortwave antenna tuning is performed as follows: The capacitance value of the second capacitor group connected to the matching network and the capacitance value of the third capacitor group connected to the matching network are adjusted so that the impedance of the transmitting circuit is within the tunable region.

5. The method according to claim 3, characterized in that: The second stage of shortwave antenna tuning is performed as follows: The inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network are adjusted so that the actual admittance value of the transmitting circuit is close to the preset admittance value.

6. The method according to claim 5, characterized in that The preset admittance value is determined by the following method: Taking the reference admittance value as a reference, a left-right scan is performed near the reference admittance value to determine the preset admittance value.

7. The method according to claim 3, characterized in that The shortwave antenna tuning in the third stage is performed in the following manner: The inductance value of the inductor group connected to the matching network and the capacitance value of the first capacitor group connected to the matching network are adjusted in minimum steps, so that the standing wave ratio of the transmitting circuit is close to the preset standing wave ratio.

8. An electronic device, characterized in that: comprising a memory and a processor, wherein: The memory is used to store the computer program; The processor is used to execute the computer program to implement the shortwave antenna tuning method as described in any one of claims 3 to 7.

9. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein when the computer program is executed by a processor, the shortwave antenna tuning method according to any one of claims 3 to 7 is implemented.

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