Ultralow-frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna

Abstract

The invention relates to the technical field of low-frequency navigation, and discloses an ultra-low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna, which comprises a shell and a movable assembly, a bottom plate is fixedly mounted at the bottom of the shell, and the movable assembly is used for relieving resistance in water when the navigation device is used in water. According to the ultra-low-frequency air-water cross-medium navigation device based on the permanent magnet mechanical antenna, by means of the arrangement of the movable assembly, when a baffle slides upwards, a connecting rod is driven to slide, so that a rotating shaft and a threaded rod are driven to rotate, when the threaded rod rotates, a connecting frame and a flow guide plate are driven to slide downwards, and therefore the ultra-low-frequency air-water cross-medium navigation device is inserted into water for use; the navigation device can relieve the situation that when the navigation device is used in water, resistance in water is reduced, impact force of water flow possibly enables the device to violently shake and drift on the water surface, the stability of the device is affected, signal transmission between the device and an underwater vehicle can be disturbed, the navigation precision is reduced, the navigation precision is improved, and the durability of the device is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-frequency navigation, and particularly to an extremely low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna. Background Art

[0002] In the fields of modern underwater navigation and water-related operations, precise navigation plays a crucial role in ensuring the smooth progress of tasks, improving operation efficiency, and ensuring navigation safety. Due to the characteristics of extremely low-frequency signals such as small attenuation during propagation in water, they have unique advantages in air-water cross-medium navigation applications. An extremely low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna has emerged. However, it faces many challenges in actual water and underwater usage environments, prompting in-depth research and optimization of its related designs and working principles.

[0003] However, when the existing extremely low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna is used on water, it is a common phenomenon that the water flow situation is complex and changeable. Most existing navigation devices are not equipped with effective water flow buffering and guiding structures. In the face of water flow impact and the resistance of water flow during movement, they can only passively withstand, which makes the device prone to severe shaking, drifting and other unstable situations on the water surface. On the one hand, it affects the stable placement and normal working state of the device itself on water. On the other hand, this instability seriously interferes with the signal transmission between the device and the underwater vehicle, resulting in a significant decrease in navigation accuracy and making it difficult to meet the requirements of high-precision navigation in actual applications, restricting the effective application of the navigation device in complex water environments. Summary of the Invention

[0004] (I) Technical Problems to be Solved In view of the deficiencies of the prior art, the present invention provides an extremely low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna, which solves the problem that when the extremely low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna is used on water, the complex and changeable water flow situation will cause the resistance and impact force of the water flow to cause the navigation device to shake and be unstable.

[0005] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solutions: An extremely low-frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna, including a housing, and a bottom plate is fixedly installed at the bottom of the housing; It further includes a movable component for alleviating the water resistance when the navigation device is used in water; A moving component for improving the effect of alleviating the water resistance; A fixing component for stabilizing the movable component and the moving component when they are used in water; The movable component includes: a rotating shaft rotatably connected to the top of the bottom plate. A connecting rod is slidably connected to the surface of the rotating shaft. A threaded rod is threadedly connected inside the rotating shaft. A connecting frame is fixedly installed at the top of the threaded rod. The connecting frame is slidably connected to the outer wall of the housing. A flow guide plate is slidably connected to the surface of the connecting frame.

[0006] Preferably, a base is fixedly installed at the bottom of the housing. A floating plate is slidably connected inside the base. A floating ball is fixedly installed inside the floating plate. A sliding rod is placed on the top of the floating ball. A fixing plate is fixedly installed on the inner wall of the housing. The sliding rod passes through the top of the fixing plate. A baffle is fixedly installed on the outer side of the sliding rod. The baffle is slidably connected inside the housing. The connecting rod is fixedly installed on the outer wall of the baffle.

[0007] Preferably, the moving component includes: movable blades rotatably connected to the inner wall of the connecting frame. A rotating shaft is fixedly installed inside the movable blades. A sliding rod is slidably connected to the surface of the rotating shaft. A stop block is fixedly installed on the surface of the sliding rod.

[0008] Preferably, the stop block is slidably connected to the inside of the connecting frame. The flow guide plate is fixedly installed on the surface of the stop block. A filter plate is fixedly installed inside the connecting frame. The stop block fits on the surface of the filter plate.

[0009] Preferably, the fixing component includes: a gear fixedly installed on the surface of the rotating shaft. A rack meshes with the surface of the gear. The rack is slidably connected to the top of the bottom plate. A connecting column is fixedly installed at the top of the rack. A support rod is fixedly installed at the bottom of the connecting column. A support block is fixedly installed at the bottom of the support rod.

[0010] Preferably, a through groove is formed on the surface of the housing. A movable lid is hinged to the top of the housing. A sliding groove is formed on the surface of the bottom plate.

[0011] Preferably, a power supply is fixedly installed inside the housing. A motor is fixedly installed on the left side of the power supply through a connecting wire. A control board is fixedly installed at the bottom of the motor. The control board is fixedly installed inside the housing. A spiral coupling is fixedly installed on the surface of the output shaft of the motor. A load housing is fixedly installed inside the housing. A neodymium iron boron material is fixedly installed inside the load housing. A high-frequency antenna, a display screen, a frequency control knob, a button, and a power switch are fixedly installed on the surface of the housing.

[0012] Preferably, an arc-shaped groove one is formed on the surface of the rotating shaft. An arc-shaped groove two is formed on the surface of the rotating shaft.

[0013] Preferably, the cross-section of the flow guide plate is triangular, and the cross-section of the support block is U-shaped.

[0014] (III) Beneficial effects Compared with the prior art, the present invention provides an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna, which has the following beneficial effects: 1. The ultra-low frequency air-water cross-medium navigation device based on the permanent magnet mechanical antenna utilizes the setting of the movable component. When the baffle slides upward, it will also drive the connecting rod to slide, thereby driving the rotation of the rotating shaft and the threaded rod. When the threaded rod rotates, it will drive the connecting frame and the guide plate to slide downward, so that it can be inserted into the water for use. This can alleviate the water resistance when the navigation device is used in water. The impact force of the water flow may cause the device to shake and drift violently on the water surface, which not only affects the stability of the device itself, but also interferes with the signal transmission between it and the underwater vehicle, resulting in a decrease in navigation accuracy. The navigation accuracy is improved and the durability of the device is enhanced.

[0015] 2. The ultra-low frequency air-water cross-medium navigation device based on the permanent magnet mechanical antenna utilizes the setting of movable components. When the float is placed on the water, the float is driven to slide upward by the floating plate, which will resist the upward sliding of the slide bar. When the slide bar slides upward, it will drive the baffle to slide upward at the through groove opened on the surface of the outer shell, so that the baffle seals the through groove, which can effectively prevent water from entering the device through the through groove. If water enters, it may cause the internal ultra-low frequency signal transmitting part, control part, power supply and other components to become damp and short-circuit, affecting the normal operation of the device, reducing the probability of component damage, and increasing the service life of the device.

[0016] 3. The ultra-low frequency air-water cross-medium navigation device based on the permanent magnet mechanical antenna utilizes the setting of the moving component. The impact force of the water flow will also drive the movable blades and the rotating shaft to rotate. When the rotating shaft rotates, it will drive the sliding rod and the block to move toward the inner wall close to the connecting frame. When the block slides, it will release the restriction on the filter plate, thereby driving the filter plate to be exposed, and cooperate with the guide plate to disperse the impact force of the water flow, thereby improving the efficiency of reducing water resistance and enhancing the practicality of the navigation equipment.

[0017] 4. The ultra-low frequency air-water cross-medium navigation device based on the permanent magnet mechanical antenna utilizes the setting of the fixed component. When the rotating shaft rotates, it will also drive the rotation of the gear on the surface. When the gear rotates, it will drive the rack, connecting column, support rod and support block to move toward the surface close to the connecting frame, so that the support block is clamped on the surface of the connecting frame for fixation, preventing the active component and the mobile component from shaking during use due to excessive water impact force and excessive water resistance, thereby improving the stability and fixing effect of the active component and the mobile component during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall front view structure of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 2 Schematic top view structure diagram of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 3 Schematic front view structure diagram of the base of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 4 Schematic top view structure diagram of the sliding rod of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 5 Schematic front view structure diagram of the movable component of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 6 Schematic front view structure diagram of the moving component of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 7 Schematic unfolded structure diagram of the flow deflector of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 8 Schematic front view structure diagram of the fixed component of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention; Figure 9 Schematic side view structure diagram of the outer shell of an ultra-low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna proposed by the present invention.

[0019] In the figure: 1. Outer shell; 2. Bottom plate; 15. Movable component; 151. Base; 152. Floating plate; 153. Floating ball; 154. Sliding rod; 155. Fixed plate; 156. Baffle; 157. Connecting rod; 158. Rotating shaft; 159. Threaded rod; 1510. Connecting frame; 1511. Flow deflector; 16. Moving component; 161. Movable blade; 162. Rotating shaft; 163. Sliding rod; 164. Stopper; 165. Filter plate; 17. Fixed component; 171. Gear; 172. Rack; 173. Connecting column; 174. Support rod; 175. Support block; 100. Through groove; 20. Chute; 3. Neodymium iron boron material; 4. Motor; 5. Spiral coupling; 6. Power supply; 7. High-frequency antenna; 8. Display screen; 9. Frequency control knob; 10. Button; 11. Power switch; 12. Connecting wire; 13. Control board; 14. Load housing; 18. Movable lid; 1580. First arc-shaped groove; 1620. Second arc-shaped groove. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1-9 As shown, a very low frequency air-water cross-media navigation device based on a permanent magnet mechanical antenna includes a housing 1. The housing 1 is made of high-strength materials and ensures strong watertightness to prevent water splashing and improve anti-destructive ability. The very low frequency signal transmitting part includes a motor 4, a spiral coupling 5, a neodymium iron boron material 3, and a load housing 14. The interior of the housing 1 adopts a method of transmitting very low frequency electromagnetic waves, which has strong penetration ability for seawater or lake water, and has a small attenuation during transmission in seawater, and can navigate underwater vehicles with large water depths. This very low frequency air-water cross-media navigation device based on a permanent magnet mechanical antenna uses very low frequency electromagnetic waves in the 300Hz - 3kHz frequency band as the navigation signal carrier, and utilizes its physical characteristics to achieve efficient penetration and low-attenuation transmission in seawater or fresh water environments. When very low frequency electromagnetic waves propagate in a conductive medium (such as seawater), its skin depth is inversely proportional to the square root of the frequency. Therefore, in the low frequency band, the skin depth increases significantly, and it can penetrate water layers hundreds of meters to kilometers deep. This characteristic enables the navigation device to establish a stable very low frequency communication link between the underwater vehicle and the water surface or cross-media platform, effectively overcoming the problem of signal interruption caused by high attenuation of traditional high-frequency signals in deep water areas. The device can realize continuous navigation and positioning of underwater vehicles with large water depths, ensuring the track accuracy and mission reliability in complex underwater environments. A bottom plate 2 is fixedly installed at the bottom of the housing 1, and the bottom plate 2 facilitates the installation and fixation of the device; It further includes a movable component 15 for relieving water resistance when the navigation device is used in water; A moving component 16 for improving the effect of relieving water resistance; A fixing component 17 for stabilizing the movable component 15 and the moving component 16 when they are used in water; First of all, the movable component 15 includes: a rotating shaft 158, the rotating shaft 158 is rotatably connected to the top of the bottom plate 2, a connecting rod 157 is slidably connected to the surface of the rotating shaft 158, a threaded rod 159 is threadedly connected inside the rotating shaft 158, a connecting frame 1510 is fixedly installed at the top of the threaded rod 159, the connecting frame 1510 is slidably connected to the outer wall of the housing 1, and a flow guiding plate 1511 is slidably connected to the surface of the connecting frame 1510. It can be used by sliding the flow guiding plate 1511 downward and inserting it into the water, which can decompose the water resistance by the flow guiding plate 1511, thereby improving the navigation accuracy and enhancing the durability of the device.

[0022] Secondly, a base 151 is fixedly installed at the bottom of the outer shell 1. A floating plate 152 is slidably connected inside the base 151. A floating ball 153 is fixedly installed inside the floating plate 152. A sliding rod 154 is placed on the top of the floating ball 153. A fixing plate 155 is fixedly installed on the inner wall of the outer shell 1. The sliding rod 154 penetrates through the top of the fixing plate 155. A baffle 156 is fixedly installed on the outer side of the sliding rod 154. The baffle 156 is slidably connected inside the outer shell 1. A connecting rod 157 is fixedly installed on the outer wall of the baffle 156. The through groove 100 can be sealed when the baffle 156 slides upward, facilitating use in water. When the baffle 156 slides downward, the sealing of the through groove 100 is released, opening the through groove 100, reducing the blockage of air, and lowering the air resistance.

[0023] Furthermore, the moving component 16 includes: a movable blade 161, which is rotatably connected to the inner wall of the connecting frame 1510. A rotating shaft 162 is fixedly installed inside the movable blade 161. A sliding rod 163 is slidably connected to the surface of the rotating shaft 162. A stop block 164 is fixedly installed on the surface of the sliding rod 163. The stop block 164 is slidably connected to the inside of the connecting frame 1510. A flow guide plate 1511 is fixedly installed on the surface of the stop block 164. A filter plate 165 is fixedly installed inside the connecting frame 1510. The stop block 164 is attached to the surface of the filter plate 165. The use of the filter plate 165 can be combined with the flow guide plate 1511 to disperse the resistance and the impact force of the water flow in the water, improving the service life of the device and reducing the probability of component damage.

[0024] Even further, the fixing component 17 includes: a gear 171, which is fixedly installed on the surface of the rotating shaft 158. A rack 172 is meshed with the surface of the gear 171. The rack 172 is slidably connected to the top of the bottom plate 2. A connecting column 173 is fixedly installed on the top of the rack 172. A support rod 174 is fixedly installed at the bottom of the connecting column 173. A support block 175 is fixedly installed at the bottom of the support rod 174. The stability of the movable component 15 and the moving component 16 can be improved by restricting the surface of the connecting frame 1510 by the support block 175. When used in the air, the support block 175 can support the ground, thereby achieving the effect of improving the stability of the ground navigation device when used on the ground.

[0025] Finally, a through groove 100 is provided on the surface of the outer shell 1, and a movable lid 18 is hinged to the top of the outer shell 1. A chute 20 is provided on the surface of the bottom plate 2. The navigation signal operation unit includes a high-frequency antenna 7, a display screen 8, a frequency control knob 9, a button 10, and a power switch 11. By adopting the method of rotating permanent magnet type mechanical motion, the design of a miniaturized low-frequency transmitting antenna is realized. The core lies in utilizing the inherent high magnetic energy level and coercivity characteristics of the permanent magnet, combined with the dynamic adjustment mechanism of mechanical drive, to replace the large electromagnetic coil and ferrite magnetic core structure relied on by traditional low-frequency electric antennas. In the frequency band of 300 Hz - 3 kHz, an electromagnetic wave radiation effect with a greatly extended equivalent electrical length is achieved with a compact physical size, thus effectively solving the problems of poor deployment flexibility, insufficient concealment, and limited environmental adaptability caused by the large physical size of existing extremely low-frequency antennas. A power supply 6 is fixedly installed inside the outer shell 1. A motor 4 is fixedly installed on the left side of the power supply 6 through a connecting wire 12. A control board 13 is fixedly installed at the bottom of the motor 4, and the control board 13 is fixedly installed inside the outer shell 1. A spiral coupling 5 is fixedly installed on the surface of the output shaft of the motor 4, and the spiral coupling 5 is fixedly connected to the output shaft of the motor 4, enhancing the rotational stability of the neodymium iron boron material 3 and improving the stable transmission of signals. A load housing 14 is fixedly installed inside the outer shell 1, and a neodymium iron boron material 3 is fixedly installed inside the load housing 14. The neodymium iron boron material 3 adopts a petal-shaped permanent magnet structure, reducing the inertial load of a single piece of material. Combining with the non-linear transmission characteristics of the spiral coupling 5, vibration and stress concentration can be reduced during high-speed rotation, ensuring the smooth movement of the permanent magnet mechanical antenna. At the same time, the segmented design enhances the overall fracture resistance of the material, avoiding damage to the brittle neodymium iron boron material caused by uneven stress during dynamic operation. A high-frequency antenna 7, a display screen 8, a frequency control knob 9, a button 10, and a power switch 11 are fixedly installed on the surface of the outer shell 1. The mechanical rotation frequency of the permanent magnet array is dynamically regulated through a high-precision servo system, driving the neodymium iron boron magnet to generate highly stable extremely low-frequency electromagnetic wave radiation in the frequency band of 300 Hz - 3 kHz. The linear mapping between the rotational speed of the motor 4 and the electromagnetic frequency is realized through the non-linear transmission characteristics of the spiral coupling, achieving various modulation methods such as amplitude shift keying (ASK), frequency shift keying (FSK), and minimum shift keying (MSK). The envelope sharpening of ASK modulation is realized by using the precision control of the rotation of the permanent magnet; the fast frequency hopping of FSK is completed through the dynamic adjustment of the rotational angular acceleration; and the continuous phase transition is achieved based on the physical inertia during the rotation of the permanent magnet, thus completing the MSK modulation.This multi-mode modulation technology improves the signal-to-noise ratio of low-frequency navigation signals in seawater, effectively suppresses multipath interference and marine environmental noise, and reduces underwater positioning errors. An arc groove 1580 is provided on the surface of the rotating shaft 158, and an arc groove 2 1620 is provided on the surface of the rotating shaft 162. The rotating shaft 158 ​​and the rotating shaft 162 can be driven to rotate when the connecting rod 157 and the sliding rod 163 slide through the arc groove 1580 and the arc groove 2 1620 provided on their surfaces. The cross-section of the guide plate 1511 is triangular, and the triangular guide plate 1511 can be used to improve the dispersion of water resistance. The cross-section of the support block 175 is U-shaped, and the U-shaped support block 175 can be used to improve the clamping effect of the support block 175 on the connecting frame 1510.

[0026] Working principle: when the ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna is used on water, the navigation device can be suspended on water through the float 153. Since the pressure in the water and the gravity of the outer shell 1 conflict with each other, when the float 153 is placed on the water, it will drive the float 153 to slide upward through the float plate 152. When the float 153 slides upward, it will conflict with the slide bar 154 to slide upward. When the slide bar 154 slides upward, it will drive the baffle 156 to slide upward at the through groove 100 opened on the surface of the outer shell 1, so that the baffle 156 can seal the through groove 100. When the navigation device is used on water, the baffle 156 seals the through groove 100, which can effectively prevent water from entering the device from the through groove 100. If water enters, the internal ultra-low frequency signal transmitting unit, control unit, power supply 6 and other components may become damp and short-circuited, affecting the normal operation of the device, or even damaging components and reducing the service life of the device. When the baffle 156 slides upward, it will also drive the connecting rod 157 to slide in the arc groove 1580 opened on the surface of the rotating shaft 158, thereby driving the rotation of the rotating shaft 158. When the rotating shaft 158 ​​rotates, it will drive the threaded rod 159 to rotate. When the threaded rod 159 rotates, it will drive the connecting frame 1510 to slide downward on the outer wall of the outer shell 1. When the connecting frame 1510 slides downward on the outer wall of the outer shell 1, it will drive the guide plate 1511 to slide downward, so that it can be inserted into the water for use, which can alleviate the water resistance when the navigation device is used in water. Due to the complex and changeable water flow conditions in the aquatic environment. If there is no guide plate 1511 inserted into the water for buffering and guiding, the impact force of the water flow may cause the device to shake and drift violently on the water surface, which will not only affect the stability of the device itself, but also interfere with the signal transmission between it and the underwater vehicle, resulting in a decrease in navigation accuracy. Improving navigation accuracy enhances the durability of the device.

[0027] When the connection box 1510 drives the flow deflector 1511 to slide downward for use, the impact force of the water flow will also drive the rotation of the movable vane 161. When the movable vane 161 rotates, it will drive the rotation of the rotating shaft 162. When the rotating shaft 162 rotates, it will drive the sliding rod 163 to move towards the inner wall of the connection box 1510. When the sliding rod 163 moves, it will drive the block 164 to slide in the moving direction of the sliding rod 163. When the block 164 slides, the restriction on the filter plate 165 will be released, so that the filter plate 165 is driven to be exposed, and together with the flow deflector 1511, the impact force of the water flow is dispersed, thereby improving the efficiency of reducing water resistance and enhancing the practicability of the navigation device.

[0028] When the rotating shaft 158 rotates, it will also drive the rotation of the gear 171 on its surface. When the gear 171 rotates, it will drive the rack 172 to move towards the surface of the connection box 1510. When the rack 172 moves, it will drive the support rod 174 and the support block 175 to move in the moving direction of the rack 172 through the connecting column 173, so that the support block 175 is clamped on the surface of the connection box 1510 for fixation, preventing the movable assembly 15 and the moving assembly 16 from shaking during use due to excessive water impact force and strong water resistance, and improving the stability and fixation effect of the movable assembly 15 and the moving assembly 16 during use.

[0029] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A very low frequency air-water cross-medium navigation device based on a permanent magnet mechanical antenna, comprising a housing (1), characterized in that: A bottom plate (2) is fixedly mounted on the bottom of the housing (1); Also included is a movable component (15) for alleviating water resistance when the navigation device is used in water; A moving component (16) for improving the effect of alleviating the resistance in water; A fixed component (17) for stabilizing the active component (15) and the mobile component (16) when used in water; The movable component (15) comprises: a rotating shaft (158), the rotating shaft (158) being rotatably connected to the top of the bottom plate (2), a connecting rod (157) being slidably connected to the surface of the rotating shaft (158), a threaded rod (159) being internally threadedly connected to the rotating shaft (158), a connecting frame (1510) being fixedly mounted on the top of the threaded rod (159), the connecting frame (1510) being slidably connected to the outer wall of the housing (1), and a guide plate (1511) being slidably connected to the surface of the connecting frame (1510).

2. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 1 is characterized in that: A base (151) is fixedly mounted on the bottom of the housing (1), a floating plate (152) is slidably connected inside the base (151), a floating ball (153) is fixedly mounted on the inner side of the floating plate (152), a sliding rod (154) is placed on the top of the floating ball (153), a fixing plate (155) is fixedly mounted on the inner wall of the housing (1), the sliding rod (154) passes through the top of the fixing plate (155), a baffle (156) is fixedly mounted on the outer side of the sliding rod (154), the baffle (156) is slidably connected to the inside of the housing (1), and the connecting rod (157) is fixedly mounted on the outer wall of the baffle (156).

3. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 1, characterized in that: The moving assembly (16) comprises: a movable blade (161), the movable blade (161) being rotatably connected to the inner wall of the connection frame (1510), a rotating shaft (162) being fixedly mounted on the inner side of the movable blade (161), a sliding rod (163) being slidably connected to the surface of the rotating shaft (162), and a stopper (164) being fixedly mounted on the surface of the sliding rod (163).

4. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 3 is characterized in that: The stopper (164) is slidably connected to the inner side of the connection frame (1510); the guide plate (1511) is fixedly mounted on the surface of the stopper (164); a filter plate (165) is fixedly mounted on the inner side of the connection frame (1510); and the stopper (164) is attached to the surface of the filter plate (165).

5. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 1, characterized in that: The fixing assembly (17) comprises: a gear (171), the gear (171) being fixedly mounted on the surface of the rotating shaft (158), a rack (172) being meshed on the surface of the gear (171), the rack (172) being slidably connected to the top of the bottom plate (2), a connecting column (173) being fixedly mounted on the top of the rack (172), a supporting rod (174) being fixedly mounted on the bottom of the connecting column (173), and a supporting block (175) being fixedly mounted on the bottom of the supporting rod (174).

6. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 1, characterized in that: A through groove (100) is provided on the surface of the shell (1), a movable cover (18) is hingedly connected to the top of the shell (1), and a sliding groove (20) is provided on the surface of the bottom plate (2).

7. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 1, characterized in that: A power source (6) is fixedly mounted inside the housing (1); a motor (4) is fixedly mounted on the left side of the power source (6) via a connecting wire (12); a control panel (13) is fixedly mounted on the bottom of the motor (4); the control panel (13) is fixedly mounted inside the housing (1); a spiral coupling (5) is fixedly mounted on the surface of the output shaft of the motor (4); a load housing (14) is fixedly mounted inside the housing (1); a rubidium iron boron material (3) is fixedly mounted on the inner side of the load housing (14); and a high-frequency antenna (7), a display screen (8), a frequency control knob (9), a button (10) and a power switch (11) are fixedly mounted on the surface of the housing (1).

8. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 3 is characterized in that: The surface of the rotating shaft (158) is provided with an arc-shaped groove 1 (1580), and the surface of the rotating shaft (162) is provided with an arc-shaped groove 2 (1620).

9. The ultra-low frequency air-water cross-medium navigation device based on permanent magnet mechanical antenna according to claim 5, characterized in that: The guide plate (1511) has a triangular cross-section, and the support block (175) has a U-shaped cross-section.

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