A tuning loop system and a very low frequency high power dual antenna tuning system

Abstract

The present application discloses a tuning loop system, including a low-feed access switch, a fine-tuning inductor, a coarse-tuning inductor, four extended inductors, and a high-feed output switch connected in series in sequence; wherein the low-feed access switch and the high-feed output switch are grounded through a low-feed grounding switch and a high-feed grounding switch, respectively; each extended inductor is connected in parallel with an extended inductor access switch, respectively, for controlling the access of the corresponding extended inductor. The present invention also discloses a very low frequency high-power dual-antenna tuning system. The present invention will provide a tuning loop system, which effectively reduces the footprint of the tuning device while ensuring that the power of the tuning device meets the engineering needs, and can realize the miniaturization and lightweight design of the tuning system, and is suitable for the very low frequency transmission system of a mobile platform.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic communication technology, and more specifically, to a tuning loop system and a very low frequency high-power dual-antenna tuning system. Background Art

[0002] Very low frequency communication is a communication method that uses very low frequency radio waves to transmit signals over long distances. Since very low frequency radio waves propagate in concentric spherical waveguides formed by the lower boundary of the earth and the ionosphere, they have the characteristics of stable propagation, low loss, and resistance to nuclear explosions. They are widely used in deep-sea communication systems and in the construction of minimum long-distance communication systems.

[0003] The VLF communication system consists of a VLF transmission system and a VLF receiving system, of which the VLF transmission system is the most important core part. The conventional fixed station transmission system mainly includes a VLF transmitter, a tuning device and an antenna. Considering the parameters and performance of the VLF transmission system, the impedance of the transmitter output is usually adjusted to be close to pure resistance. In this case, when the transmitter outputs a small current, a very high resonant voltage will be generated at the interface between the output of the tuning device and the antenna. For a VLF transmission system of hundreds of kilowatts or megawatts, the current loaded on the antenna is thousands of amperes, and the voltage at the interface between the output of the tuning device and the antenna will be as high as hundreds of kilovolts. It is extremely difficult to achieve effective radiation of high-power VLF signals by the antenna in engineering. In some communication scenarios, it is necessary to adjust the inductance required for working at different frequencies in the full band from 222μH to 1803μH. The existing tuning device configuration that can meet this condition requires a large number of inductor coils, which takes up a lot of space, has large terrain restrictions on station construction, and cannot be deployed on mobile platforms, which is very inconvenient to use. Summary of the invention

[0004] In response to at least one defect or improvement need in the prior art, the present invention provides a tuning loop system and a very low frequency high power dual antenna tuning system, which will solve at least one of the problems existing in the above-mentioned background technology.

[0005] To achieve the above object, according to a first aspect of the present invention, a tuning loop system is provided, comprising a low-feed access switch, an adjustable inductor coil group, four extended inductors, and a high-feed output switch connected in series in sequence;

[0006] The low-feed access switch and the high-feed output switch are grounded through the low-feed grounding switch and the high-feed grounding switch respectively;

[0007] Each extended inductor is respectively connected in parallel with an extended inductor access switch for controlling the access and disconnection of the corresponding extended inductor;

[0008] The adjustable inductance coil group includes a fine-tuning inductance coil and a coarse-tuning inductance coil. The first stator winding and the first rotor winding of the fine-tuning inductance coil are connected in parallel. When the first rotor rotates from 0 to 180°, the inductance is adjusted to 20μH~80μH continuously and adjustable. The second stator winding and the second rotor winding of the coarse-tuning inductance coil are connected in series. When the second rotor rotates from 0 to 180°, the inductance is adjusted to 80μH~380μH continuously and adjustable.

[0009] Furthermore, in the above tuning loop system, the extended inductor coils are all disc-shaped.

[0010] Furthermore, in the above tuning loop system, the winding portion of the extended inductor coil is supported by a fiberglass column.

[0011] Furthermore, in the above tuning loop system, an aluminum grading ring is installed around the two extended inductor coil windings close to the high-feedback output switch.

[0012] According to a second aspect of the present invention, there is provided a very low frequency high power dual antenna tuning system, comprising a low feed selection switch, two low voltage feed lines, a first tuning device, a second tuning device, two high voltage feed lines and a high feed interconnection switch;

[0013] The low-feed selection switch is connected to the first tuning device and the second tuning device respectively via two low-voltage feed lines, and the first tuning device and the second tuning device are connected to the antenna array respectively via two high-voltage feed lines through the high-feed interconnection switch;

[0014] The first tuning device and the second tuning device adopt the tuning loop system as described in any one of the above items.

[0015] Furthermore, in the above-mentioned very low frequency high-power dual-antenna tuning system, when the high-feed interconnection switch is turned on, the first tuning device and the second tuning device are connected at the same time. At this time, the first tuning device is connected to the first group of antennas, and the second tuning device is connected to the second group of antennas.

[0016] Furthermore, in the above-mentioned very low frequency high-power dual antenna tuning system, when the high-feed interconnection switch is disconnected, the low-feed selection switch selects to access the first group of antennas through the first tuning device or to access the second group of antennas through the second tuning device.

[0017] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0018] (1) The present invention provides a tuning circuit system, in which the number of tuning inductors configured in the tuning device is reduced. While ensuring that the power of the tuning device meets the engineering requirements, only four extended inductors can be used to adjust the inductance required for working at different frequency points in the full frequency band from 222 μH to 1803 μH, thereby effectively reducing the footprint of the tuning device and realizing a miniaturized and lightweight design of the tuning system, which is suitable for the very low frequency transmission system of a mobile platform.

[0019] (2) A very low frequency high-power dual-antenna tuning system provided by the present invention is adopted. The dual transmitting antenna array is equipped with two tuning devices to realize the redundancy of the transmission system, thereby improving the reliability of the entire system. In the dual-antenna tuning mode, the two antenna arrays can operate together to carry full power. Once a problem occurs in some transmitting antennas or one of the tuning devices, the access switch can be switched to realize a group of transmitting antennas connected to one tuning device, thereby improving the system reliability and survivability of the entire transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments 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 work.

[0021] Figure 1 A schematic diagram of a circuit principle of a tuning loop system provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the extended coil combination arrangement and skeleton structure provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a very low frequency high power dual antenna tuning system provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the principle of a very low frequency high power dual antenna tuning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] The terms "first", "second", "third", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0027] Figure 1 A schematic diagram of a circuit principle of a tuning loop system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the tuning loop system provided in the embodiment of the present application includes a low-feed access switch, an adjustable inductor coil group, four extended inductors, and a high-feed output switch connected in series in sequence;

[0028] The low-feed access switch and the high-feed output switch are grounded through the low-feed grounding switch and the high-feed grounding switch respectively;

[0029] Each extended inductor coil is respectively connected in parallel with an extended inductor coil access switch for controlling the access of the corresponding extended inductor coil;

[0030] The adjustable inductance coil group includes a fine-tuning inductance coil and a coarse-tuning inductance coil. The first stator winding and the first rotor winding of the fine-tuning inductance coil are connected in parallel. When the first rotor rotates from 0 to 180°, the inductance is adjusted to 20μH~80μH continuously and adjustable. The second stator winding and the second rotor winding of the coarse-tuning inductance coil are connected in series. When the second rotor rotates from 0 to 180°, the inductance is adjusted to 80μH~380μH continuously and adjustable.

[0031] Specifically, Figure 1 As shown, the tuning loop system provided in the embodiment of the present application comprises an adjustable inductor coil group (L XT , L CT )、4 extension inductors(L 1 ~L 4 )、4 extension inductor access switches (K 1 ~K 4 )、Low feed access switch S 1 , low feed grounding switch S 2 , high-feedback output switch S 3 , high-feed grounding switch S 4 And other equipment (high voltage wall insulators, discharge balls, etc.).

[0032] In one embodiment, the extended inductance coil and the coarse adjustment inductance coil are connected to the tuning system by controlling the opening and closing states of the six barrel switches to achieve the adjustment of the inductance required for working at different frequency points in the full frequency band from 222μH to 1803μH. The specific number (or state) of inductance coils connected and the inductance coverage range of the tuning system are shown in Table 1. The adjustable inductance coverage range of the tuning method is 100μH to 1810μH, which completely covers the inductance range required for the project.

[0033] Table 1 Tuning device access status and adjustable inductance range

[0034]

[0035] “Connect” means the corresponding coil is connected to the tuning system, and “-” means the corresponding coil is short-circuited by a switch.

[0036] Compared with the conventional tuning system of the same power level which requires 9 extension coils, it can be seen from the above table that the number of extension coils in the tuning loop system provided by the present application is reduced to 4, reducing the compensation coils. It is only necessary to control 4 switch states and the rotation angle of the two adjustable coil rotors through the tuning control circuit to achieve full coverage of the tuning inductance of the corresponding tuning device of the transmitting antenna, which is simpler and more reliable than traditional tuning control.

[0037] The adjustable inductor coil group provided in the embodiment of the present application includes a fine-tuning inductor coil and a coarse-tuning inductor coil, wherein the structural forms of the coarse-tuning inductor coil and the fine-tuning inductor coil can be unified, and both are inductor coils that can continuously adjust the inductance within a certain range, that is, both achieve continuous adjustment of the inductance by rotating the middle rotor winding to adjust the relative angle between the rotor winding and the stator winding. The stator winding and the rotor winding of the fine-tuning inductor coil are connected in parallel, and the inductance adjustment range is 20μH~80μH and can be continuously adjusted when the rotor rotates from 0~180°. The stator winding and the rotor winding of the coarse-tuning inductor coil are connected in series, and the inductance adjustment range is 80μH~380μH and can be continuously adjusted when the rotor rotates from 0~180°.

[0038] In one embodiment, the total cross-sectional area of ​​the wire used for the winding of the coarse adjustment inductor coil and the fine adjustment inductor coil is consistent with that of the extended coil, which is also 300 mm 2 , meeting engineering requirements.

[0039] The present invention provides a tuning loop system, in which the number of tuning inductance coils configured in a tuning device is reduced. While ensuring that the power of the tuning device meets the engineering needs, only four extended inductance coils can be used to achieve the adjustment of the inductance required for working at different frequency points in the full frequency band from 222μH to 1803μH, thereby effectively reducing the footprint of the tuning device and realizing a miniaturized and lightweight design of the tuning system, which is suitable for a very low frequency transmission system of a mobile platform.

[0040] Optionally, in the tuning loop system provided in the embodiments of the present application, the extended inductor coils are all disc-shaped.

[0041] Optionally, in the tuning loop system provided in the embodiment of the present application, the winding portion of the extended inductor coil is supported by a fiberglass column.

[0042] Optionally, in the tuning loop system provided in the embodiment of the present application, an aluminum grading ring is installed around the periphery of two extended inductor coil windings close to the high-feedback output switch.

[0043] Specifically, Figure 2 As shown, in one embodiment, the extended inductor provided in the embodiment of the present application is composed of an anti-corona ring, an 11-turn coil positioning column, an epoxy plate, an epoxy column, a barrel switch and a transmission fan. In practical applications, it is not limited to the embodiment of the present application. Figure 2 The structure provided can be designed as long as it meets the engineering requirements. The extended inductor coil provided in the embodiment of the present application is also called a fixed inductor coil. Because the extended coil conductor part requires a high withstand voltage to the ground, and the inductance of a single coil is relatively large (400μH can be achieved in general engineering, and it is designed as 300μH here. When two coils are installed and arranged in parallel with a concentric distance of 1m, the increased mutual inductance of the entire fixed inductor is calculated as 50μH, and the gap in the middle is negligible), it is designed to be disc-shaped. The winding part of each extended inductor coil is supported by a fiberglass column about two meters high to improve the withstand voltage of the extended inductor coil to the ground and ensure the electrical safety of the tuning system. L 3 and L 4 The extension coil is installed at the high feed end, where the relative working voltage is the highest. Therefore, an aluminum grading ring is installed around the coil winding to prevent tip discharge or local corona. The layout and skeleton structure of the extension inductor coil are as follows: Figure 2 shown.

[0044] In one embodiment, the maximum current carried by the inductor of the tuning device is 800A, and the current carrying capacity of the multiple excitation wires is 3A / mm 2 , determine that the inductor coil for the extended inductor uses 6 strands with a cross-sectional area of ​​50mm 2 The multi-strand excitation wire winding coil has a total cross-sectional area of ​​300mm 2 , meeting engineering requirements.

[0045] The embodiment of the present application also provides a very low frequency high power dual antenna tuning system, including a low feed selection switch, two low voltage feed lines, a first tuning device, a second tuning device, two high voltage feed lines and a high feed interconnection switch;

[0046] The low-feed selection switch is connected to the first tuning device and the second tuning device respectively via two low-voltage feed lines, and the first tuning device and the second tuning device are connected to the antenna array respectively via two high-voltage feed lines through the high-feed interconnection switch;

[0047] The first tuning device and the second tuning device adopt the above-mentioned tuning loop system.

[0048] Specifically, the present invention provides a very low frequency high power dual antenna tuning system, the composition block diagram is as follows Figure 3 As shown, it is mainly composed of a low-feed selection switch, two low-voltage feeders, a first tuning device (main tuning device), a second tuning device (standby tuning device), a high-voltage feeder and a high-feed interconnection switch. The low-feed selection switch connects the output of the very low frequency transmitter to the dual tuning system. By controlling the low-feed selection switch, the output of the very low frequency transmitter can be connected to the first tuning device or the second tuning device through the low-voltage feeder; the output of the tuning device is connected to the high-voltage feeder, and then the dual tuning system is connected to the two sets of antenna pins through the high-feed interconnection switch, and finally the dual antenna tuning working mode is realized.

[0049] The high-feed interconnection switch of the dual tuning system provided in the embodiment of the present application realizes the separate feeding and unified feeding of the dual antenna arrays with high feed output by the tuning device. The layout and electrical parameters in the two tuning devices are completely consistent. The dual transmitting antenna arrays and the two tuning devices can realize full-band tuning in a unified manner; the transmitting antenna arrays and the tuning devices can also be arbitrarily combined to realize one-to-one tuning separately, and the system operates at half power; in addition, a tuning device can also be used to tune the dual transmitting antennas, reduce the antenna Q value, broaden the antenna bandwidth, and realize high-speed very low frequency transmission; thus, three different working modes of the dual antenna tuning system are realized. In the dual antenna tuning mode, the two antenna arrays can carry full power when running together, and the transmitting antenna has the best electrical performance. Once a problem occurs in part of the transmitting antenna or one of the tuning devices, it can be switched by accessing the switch to realize a group of transmitting antennas connected to a tuning device. This method can greatly improve the system reliability and survivability of the entire transmission system.

[0050] Optionally, in the very low frequency high power dual antenna tuning system provided in the embodiment of the present application, when the high feed interconnection switch is turned on, the first tuning device and the second tuning device are connected at the same time, at which time the first tuning device is connected to the first group of antennas, and the second tuning device is connected to the second group of antennas.

[0051] Optionally, in the very low frequency high power dual antenna tuning system provided in the embodiment of the present application, when the high feed interconnection switch is disconnected, the low feed selection switch selects to access the first group of antennas through the first tuning device or to access the second group of antennas through the second tuning device.

[0052] Specifically, Figure 4 As shown, the low feed selection switch S 0 , the function is to connect the VLF transmitter output to one of the tuning devices; when S 0 When the electrodes 1 and 2 of S are connected, the output of the VLF transmitter is fed to the first tuning device through the main feed of the first tuning device; 0 When electrodes 1 and 3 are connected, the output of the very low frequency transmitter is fed to the second tuning device through the main feed of the second tuning device.

[0053] The first tuning device is connected by a low-feed switch S 11 , low feed ground switch S 12 , tuning inductor group L 1 , high-feed output switch S 13 , high feed grounding switch S 14 The second tuning device is composed of a low-feed access switch S 21 , low feed ground switch S 22 , tuning inductor group L 2 , high-feed output switch S 23 , high feed grounding switch S 24 The components are the same as those of the first tuning device. 5 , the function is to connect the antenna tent high voltage feeder lines together when two sets of antennas are working at the same time, so that the two sets of antennas can run in parallel.

[0054] like Figure 4 The figure shows the situation where two tuning devices are connected to two antennas respectively. At this time, the low feed selection switch S 0 Electrode 1 and electrode 2 are connected, and the low feed is connected to switch S 11 , high-feedback output switch S 13 , high-feedback output switch S 23 , low feed grounding switch S 22 and high-feed interconnection switch S 5 They are connected respectively, at this time, the first tuning device is connected to the first group of antennas, and the second tuning device is connected to the second group of antennas. At this time, the very low frequency high-power dual-antenna tuning system can operate in a full-power state.

[0055] In one embodiment, the operation of the very low frequency high power dual antenna tuning system provided in the embodiment of the present application is described by taking the implementation of the tuning device of the dual tuning system of a 500kW very low frequency transmission system as an example.

[0056] The electrical parameter table of the single transmitting antenna array test of the 500kW VLF transmission system is shown in Table 2. The test frequency range covers the index values ​​specified by the system (15kHz~30kHz). According to the measured antenna parameters, since the Q value of the antenna array at the low frequency end is very high, up to 300, the tuning output current is close to 800A (the calculated value is 745A), and the maximum voltage converted to the tuning output point exceeds 120kV. The operating frequency range of the VLF transmission system is from 15kHz to 30kHz, and the corresponding inductance value required by the tuning device is also listed in Table 1. According to the antenna tuning theory, the inductive reactance is equal to the imaginary part of the antenna, that is, X C =X L In the resonant state, the conversion formula of the inductance of the tuning device is:

[0057] L =X C / 2πf

[0058] Therefore, the inductance adjustment range of the tuning device in the full frequency band is calculated to be: 222μH~1803μH.

[0059] Table 2 Electrical parameters of a single transmitting antenna array test

[0060]

[0061] It can be seen from the above table that the adjustable inductance range of the tuning method provided in the present application is 100 μH to 1810 μH, which completely covers the inductance range required by the project.

[0062] The embodiment of the present application provides a very low frequency high power dual antenna tuning system, a low feed access switch S 1 Used as a low-feed selector switch to feed a very low frequency carrier high-power signal to the tuning device when the tuning device is working; low-feed grounding switch S 2 The function is to ground the fine tuning inductor coil end of the tuning device or the low voltage feeder when the low voltage tuning device is not working; the high feed output switch S 3 As a tuned very low frequency carrier high power signal, it is connected to the high-feed interconnection switch; the high-feed grounding switch S 4 The function is to ensure that the high-voltage feeder connected to the tuning device is reliably grounded when the tuning device is not working, so as to avoid the impact of lightning introduced by the antenna array or the high-voltage feeder on the tuning device. The tuning device is connected to the high-voltage feeder through a high-voltage wall bushing. To avoid surface creepage on the wall bushing and internal breakdown of the bushing, the surface of the bushing should be kept clean and the internal relative atmospheric pressure should be kept at one atmospheric pressure.

[0063] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0065] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0066] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0067] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tuning loop system, characterized in that: It includes a low-feed access switch, an adjustable inductor coil group, four extended inductors, and a high-feed output switch connected in series in sequence; The low-feed access switch and the high-feed output switch are grounded through the low-feed grounding switch and the high-feed grounding switch respectively; Each extended inductor is respectively connected in parallel with an extended inductor access switch for controlling the access and disconnection of the corresponding extended inductor; The adjustable inductance coil group includes a fine-tuning inductance coil and a coarse-tuning inductance coil. The first stator winding and the first rotor winding of the fine-tuning inductance coil are connected in parallel. When the first rotor rotates from 0 to 180°, the inductance is adjusted to 20μH~80μH continuously and adjustable. The second stator winding and the second rotor winding of the coarse-tuning inductance coil are connected in series. When the second rotor rotates from 0 to 180°, the inductance is adjusted to 80μH~380μH continuously and adjustable.

2. The tuning loop system according to claim 1, wherein: The extended inductor coils are all in the shape of a disk.

3. The tuning loop system according to claim 2, wherein: The winding part of the extended inductor coil is supported by a glass fiber reinforced plastic column.

4. The tuning loop system according to claim 3, wherein: An aluminum grading ring is installed around the outer periphery of the two extended inductor coil windings close to the high-feed output switch.

5. A very low frequency high power dual antenna tuning system, using the tuning circuit system according to any one of claims 1 to 4, characterized in that: It includes a low-feed selection switch, two low-voltage feeders, a first tuning device, a second tuning device, two high-voltage feeders and a high-feed interconnection switch; The low-feed selection switch is connected to the first tuning device and the second tuning device respectively via two low-voltage feed lines, and the first tuning device and the second tuning device are connected to the antenna array respectively via two high-voltage feed lines through the high-feed interconnection switch; The first tuning device and the second tuning device adopt the tuning loop system.

6. The very low frequency high power dual antenna tuning system as claimed in claim 5, characterized in that: When the high-feed interconnection switch is turned on, the first tuning device and the second tuning device are connected at the same time. At this time, the first tuning device is connected to the first group of antennas, and the second tuning device is connected to the second group of antennas.

7. The very low frequency high power dual antenna tuning system as claimed in claim 5, characterized in that: When the high-feed interconnection switch is disconnected, the low-feed selection switch selects to access the first group of antennas through the first tuning device or to access the second group of antennas through the second tuning device.

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