Anti-interference connection structure, combined navigation device and guided missile

Abstract

The utility model relates to the application field of guided missile integrated navigation. More specifically, the utility model relates to an anti-interference connection structure, an integrated navigation device and a missile, the anti-interference connection structure comprises a shielding box; a female head of the three-coaxial radio frequency connector penetrates through the shielding box and is in sealed connection with the shielding box; and one end of the three-coaxial cable is connected with the three-coaxial radio frequency connector male head. According to the anti-interference connecting structure, the combined navigation device and the guided missile, the combined navigation device comprising the anti-interference connecting structure is applied to the guided missile, so that a satellite navigation antenna of the combined navigation device is not interfered by internal parts of the guided missile.

Description

Technical Field

[0001] This utility model relates to the field of missile integrated navigation applications. More specifically, this utility model relates to an anti-interference connection structure, an integrated navigation device, and a missile. Background Technology

[0002] Integrated navigation overcomes the shortcomings of pure inertial navigation, which suffers from the cumulative divergence of errors over time. It offers advantages such as low cost and high navigation accuracy, and has been widely used in low-cost missile projects. However, the satellite navigation antenna in integrated navigation systems is susceptible to interference from other components of the missile, thus affecting the positioning performance of the satellite navigation system.

[0003] To address the aforementioned issues, existing solutions involve either covering the interference source or designing a shielded box to house the integrated navigation device. Covering the interference source is complex, costly, and detrimental to mass production. The method of installing the integrated navigation device in a shielded box, however, cannot achieve complete physical shielding because the satellite navigation antenna must be connected to the main body of the integrated navigation device, thus affecting the integrated navigation's satellite search and positioning capabilities. Utility Model Content

[0004] This invention provides an anti-interference connection structure, a combined navigation device, and a missile. The combined navigation device, including the anti-interference connection structure, is applied inside the missile, so that the satellite navigation antenna of the combined navigation device is not interfered with by the internal components of the missile.

[0005] To achieve these objectives and other advantages according to the present invention, an anti-interference connection structure is provided for connecting a signal receiving terminal and an antenna, comprising:

[0006] A shielding box, wherein the antenna is disposed inside the shielding box, and the shielding box is provided with a notch for the antenna to communicate with the outside;

[0007] A coaxial RF connector, the female part of which passes through the shielding box and is sealed to it;

[0008] A coaxial cable, one end of which is connected to the male connector of the coaxial RF connector, and the other end of which is provided with a connector and connected to the signal receiving terminal through the connector.

[0009] Furthermore, in the aforementioned anti-interference connection structure, the coaxial RF connector is a triaxial RF connector, and the coaxial cable is a triaxial cable.

[0010] Furthermore, in the aforementioned anti-interference connection structure, the shielding box is a metal shielding box.

[0011] Furthermore, in the aforementioned anti-interference connection structure, the shielding box is provided with mounting holes corresponding to the female head of the three-coaxial RF connector, and the female head of the three-coaxial RF connector has a flange, which is connected to the shielding box through the flange.

[0012] This utility model also provides a combined navigation device, including a combined navigation body and a satellite navigation antenna, and also includes the above-mentioned anti-interference connection structure. The satellite navigation antenna is disposed in the shielding box and connected to the female head of the triaxial RF connector. The other end of the triaxial cable is connected to the combined navigation body through the connector.

[0013] This utility model also provides a missile, including the above-mentioned integrated navigation device.

[0014] Furthermore, in one type of missile, the shielding box is connected to the inner wall of the missile casing, and one end of it connected to the missile casing is open. The missile casing is provided with a notch communicating with the opening, and the satellite navigation antenna communicates with the outside of the missile casing through the notch.

[0015] Furthermore, in one type of missile, the opening end of the shielding box is provided with an outward flange, which is connected to the missile casing.

[0016] Furthermore, the missile described above also includes:

[0017] A connecting plate is disposed inside the shielding box. One end of the connecting plate is connected to the satellite navigation antenna, and the other end is connected to the inner wall of the shielding box. The connecting plate is provided with a through hole for the female head of the triaxial RF connector to pass through.

[0018] Furthermore, the missile described above also includes:

[0019] Mounting bracket, through which the integrated navigation body is connected to the inner wall of the missile's casing.

[0020] The beneficial effects of this utility model are:

[0021] 1. This utility model uses a triaxial RF connector and triaxial cable to solve the signal connection and transmission shielding problems between integrated navigation components. The effect is consistent with the state of the integrated navigation unit, providing a feasible solution for integrated navigation and satellite navigation application projects.

[0022] 2. This utility model adopts an integrated slotted structure design method that connects the shielding box with the flange to the missile shell, which solves the problem of difficult processing of irregular surface of the inner cavity of the compartment shell, simplifies the processing technology, and is easy to disassemble and assemble. Compared with the traditional rectification method, it improves production efficiency and reduces costs.

[0023] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the missile described in this utility model;

[0025] Figure 2 This is a schematic diagram of the shielding box described in this utility model.

[0026] The reference numerals in the attached figures are as follows:

[0027] Shielding box 1; Triaxial RF connector female 2; Triaxial RF connector male 3; Triaxial cable 4; Connector 5; Shielding layer 6; Integrated navigation body 7; Satellite navigation antenna 8; Missile casing 9; Connecting plate 10; Mounting bracket 11. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0029] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] like Figure 1 As shown, an embodiment of this utility model also provides a combined navigation device, including a combined navigation body 7 and a satellite navigation antenna 8, and further comprising:

[0031] Metal shielding box 1;

[0032] The triaxial RF connector has a shielding box 1 with mounting holes corresponding to the triaxial RF connector female head 2. The triaxial RF connector female head 2 has a flange and is connected to the shielding box 1 through the flange.

[0033] The triaxial cable 4 has one end connected to the male connector 3 of the triaxial RF connector, and the other end is provided with a connector 5, which is connected to the integrated navigation body 7.

[0034] The satellite navigation antenna 8 is housed inside the shielding box 1 and connected to the female head of the triaxial RF connector 2. The connector 5 at the other end of the triaxial cable 4 is connected to the integrated navigation body 7.

[0035] In this embodiment, the coaxial cable consists of a center conductor, an insulation layer, one or more outer conductors (typically a metal braided shield), and an outer protective layer. This structure makes the coaxial cable excellent in resisting external electromagnetic interference while also efficiently transmitting high-frequency signals. The coaxial connector operates based on the working principle of the coaxial cable. When a signal is transmitted through the coaxial cable, the signal propagates along the center conductor, while the outer conductor acts as shielding and part of the ground loop. The coaxial connector aligns with the corresponding sections of the cable and establishes electrical continuity through its internal center and outer conductors, allowing signals to be transmitted from one end of the cable to the other, or from the cable to a device, and vice versa.

[0036] Triaxial cables add a second layer of shielding and a second layer of insulation to the basic coaxial cable. Therefore, they consist of a center conductor, a first layer of insulation, an inner shield, a second layer of insulation, an outer shield, and an outer protective layer. This additional shielding provides better electromagnetic compatibility (EMC) and lower electromagnetic interference (EMI). The biggest advantage of triaxial cables compared to coaxial cables is their enhanced shielding. The double shielding virtually eliminates all electromagnetic interference, ensuring high signal integrity even in interference-prone environments. Triaxial RF connectors contain a three-layer conductor structure: an inner conductor (main signal transmission), a middle conductor (signal loop or auxiliary transmission layer), and an outer conductor (outer shield). Compared to coaxial connectors, the addition of a middle conductor layer creates a three-layer coaxial structure, isolating potential differences between the different conductor layers. It can simultaneously connect signals, ground, and shielding, providing superior shielding performance and offering higher shielding capabilities and smaller signal transmission capacity compared to coaxial connectors.

[0037] In this embodiment, the metal shielding box 1, the triaxial RF connector, and the triaxial cable 4 form an anti-interference connection structure. This anti-interference connection structure is used to connect the navigation body 7 and the satellite navigation antenna 8. The satellite navigation antenna 8 is placed inside the shielding box 1, with an opening in the shielding box 1 to allow the satellite navigation antenna 8 to communicate with the outside world for signal transmission. The RF signal output by the satellite navigation antenna 8 includes an analog RF signal and a signal ground. Ordinary coaxial connectors can expose the signal ground to interference when transmitting RF signals. In addition, the signal ground transmitted by the connector needs to be insulated from the shielding box 1. Therefore, this embodiment uses a triaxial RF connector to transmit the antenna RF signal. The shielding box 1, the outer layer of the triaxial RF connector, and the outer layer of the triaxial cable 4 together form a shielding layer 6. The shielding layer 6 effectively shields the RF signal, theoretically completely eliminating any potential interference to the RF signal.

[0038] Furthermore, the triaxial RF connector and triaxial cable 4 in this embodiment can also use existing quad coaxial connectors and quad coaxial cables. For example... Figures 1-2 As shown, this utility model also provides a missile, including the above-mentioned integrated navigation device.

[0039] The shielding box 1 is connected to the inner wall of the missile housing 9, and one end of the shielding box 1 connected to the missile housing 9 is open. The shape of the open end of the shielding box 1 matches the inner wall of the missile housing 9, so that it can fit precisely with the missile housing 9. The missile housing 9 is provided with a notch that communicates with the opening. The satellite navigation antenna 8 communicates with the outside of the missile housing 9 through the notch.

[0040] In this embodiment, the shape inside the shielding box 1 matches the satellite navigation antenna 8, allowing the satellite navigation antenna 8 to be embedded inside the shielding box 1. The open end of the shielding box 1 is attached to and connected to the inner wall of the missile housing 9. The area of ​​the notch on the missile housing 9 is smaller than the area of ​​the opening at one end of the shielding box 1. Thus, when the open end of the shielding box 1 is connected to the inner wall of the missile housing 9, the part of the missile housing 9 located inside the open end will form an annular limiting part, which, together with the shielding box 1, fixes the satellite navigation antenna 8. The satellite navigation antenna 8 communicates with the outside of the missile housing 9 through the notch, outputting radio frequency signals to the outside.

[0041] In the missile's structure, the satellite navigation antenna 8 needs to be installed on the control compartment. Machining the irregularly shaped surface of the control compartment's inner cavity as a single unit is difficult and not conducive to mass production. By adopting an integrated slotted structure where the shielding box 1 is independently machined and connected to the slotted surface inside the shell, the problem of machining the irregularly shaped surface of the control compartment's inner cavity is solved, the manufacturing process is simplified, and it is easy to assemble and disassemble.

[0042] Preferably, as another embodiment of the present invention, the opening end of the shielding box 1 is provided with an outward flange, which is connected to the missile casing 9.

[0043] In this embodiment, such as Figure 2 As shown, multiple countersunk holes are provided on the outer flange, and multiple threaded holes are provided on the inner wall of the missile housing 9. After the threaded holes and countersunk holes are connected one by one, screws are installed. Tightening the screws will fix the shielding box 1 and the missile housing 9.

[0044] Preferably, as another embodiment of this utility model, it further includes:

[0045] A connecting plate 10 is disposed inside the shielding box 1. One end of the connecting plate 10 is connected to the satellite navigation antenna 8, and the other end is connected to the inner wall of the shielding box 1. The connecting plate 10 is provided with a through hole for the female head 2 of the triaxial RF connector to pass through.

[0046] In this embodiment, to facilitate the positioning of the satellite navigation antenna 8 within the shielding box 1, a connecting plate 10 is provided on the satellite navigation antenna 8, such as... Figure 2 As shown, the shielding box 1 is provided with multiple positioning holes, and the connecting plate 10 is provided with multiple positioning components. The positioning holes and positioning components correspond one-to-one. By inserting the positioning components into the corresponding positioning holes, the satellite navigation antenna 8 and the shielding box 1 can be quickly positioned.

[0047] Preferably, as another embodiment of this utility model, it further includes:

[0048] Mounting bracket 11, through which the combined navigation body 7 is connected to the inner wall of the missile casing 9.

[0049] In this embodiment, the shape of the lower end of the mounting bracket 11 matches the inner wall of the missile housing 9, thereby making the connection between the mounting bracket 11 and the missile housing 9 tighter and the combined navigation body 7 more stable inside the missile housing 9.

[0050] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and embodiments shown and described herein.

Claims

1. An interference-resistant connection structure for connecting a signal receiving terminal and an antenna, characterized by, include: A shielding box, wherein the antenna is disposed inside the shielding box, and the shielding box is provided with a notch for the antenna to communicate with the outside; A coaxial RF connector, the female part of which passes through the shielding box and is sealed to it; A coaxial cable, one end of which is connected to the male connector of the coaxial RF connector, and the other end of which is provided with a connector and connected to the signal receiving terminal through the connector.

2. The tamper-resistant connection of claim 1, wherein, The coaxial RF connector is a triaxial RF connector, and the coaxial cable is a triaxial cable.

3. The tamper-resistant connection of claim 2, wherein, The shielding box is a metal shielding box.

4. The tamper-resistant connection of claim 2, wherein, The shielding box is provided with mounting holes corresponding to the female head of the triaxial RF connector. The female head of the triaxial RF connector has a flange and is connected to the shielding box through the flange.

5. A combined navigation device comprising a combined navigation body and a satellite navigation antenna, characterized in that It also includes the anti-interference connection structure as described in any one of claims 2-4, wherein the satellite navigation antenna is disposed inside the shielding box and connected to the female head of the triaxial RF connector, and the other end of the triaxial cable is connected to the integrated navigation body through the connector.

6. A missile, characterized by Includes the integrated navigation device as described in claim 5.

7. A missile as claimed in claim 6, wherein, The shielding box is connected to the inner wall of the missile casing, and one end of it connected to the missile casing is open. The missile casing has a notch that communicates with the opening, and the satellite navigation antenna communicates with the outside of the missile casing through the notch.

8. A missile as claimed in claim 7, wherein, The shielding box has an outward-flared edge at its open end, which is connected to the missile casing.

9. A missile as claimed in claim 7, wherein, Also includes: A connecting plate is disposed inside the shielding box. One end of the connecting plate is connected to the satellite navigation antenna, and the other end is connected to the inner wall of the shielding box. The connecting plate is provided with a through hole for the female head of the triaxial RF connector to pass through.

10. A missile as claimed in claim 7, wherein, Also includes: Mounting bracket, through which the integrated navigation body is connected to the inner wall of the missile's casing.

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