Inertial navigation system suitable for 50 fiber-optic gyroscope

Abstract

The utility model discloses an inertial navigation system suitable for a 50 fiber-optic gyroscope, which belongs to the technical field of inertial navigation systems and is characterized in that an IMU (Inertial Measurement Unit) component is fixedly arranged on a bottom plate through an IMU bracket; the circuit board assembly comprises a system board support fixedly arranged on the side face of the IMU support, a system board fixedly arranged on the system board support, a dual-purpose support fixedly arranged on the other opposite side face of the IMU support, an AD board fixedly arranged in a mounting groove of the dual-purpose support and an adapter plate fixedly arranged on the outer side of the dual-purpose support. The connector assembly is fixedly arranged on the IMU support and comprises an external connector fixedly arranged on the side wall and a transition connector fixedly arranged on the IMU support. The IMU support, the system board support and the dual-purpose support are arranged together, the internal space of an inertial navigation system is utilized to the maximum extent, the structure is compact, the space utilization rate is high, and the size is small.

Description

Technical Field

[0001] This utility model belongs to the technical field of inertial navigation systems, specifically relating to an inertial navigation system suitable for 50 fiber optic gyroscopes. Background Technology

[0002] An inertial navigation system (INS) is an inertial reference system that measures the acceleration and angular velocity of a vehicle using accelerometers and gyroscopes. By integrating these measurements over time, it can obtain information such as the vehicle's current speed, direction of travel, and position. INS are currently mainly used in various vehicles such as aircraft, underwater vehicles, space shuttles, ships, and missiles. INS have the following advantages: (1) INS do not transmit signals to the outside world during operation, possessing strong stealth capabilities; (2) They rely primarily on their own accelerometers and gyroscopes for navigation, without receiving external information, possessing strong anti-interference capabilities; (3) They are not limited by climate or geographical location and can operate in extreme weather, deep sea, and outer space environments; (4) They can simultaneously provide information such as the vehicle's current attitude angle, speed, acceleration, spatial position, and heading; (5) They have a high data refresh rate and high accuracy in a short time.

[0003] The accuracy of an inertial navigation system primarily depends on the accuracy of the gyroscope used. Fiber optic gyroscopes, with their higher accuracy compared to flexible gyroscopes and simpler manufacturing processes and lower costs compared to laser gyroscopes, have become the mainstream choice for inertial navigation systems. The accuracy and size of the fiber optic gyroscope significantly influence its cost. Currently, the structural layout of inertial navigation systems using 50mm fiber optic gyroscopes (fiber optic strapdown inertial navigation systems commonly use fiber optic gyroscopes with diameters of 50mm, 60mm, 70mm, 98mm, and 120mm) requires further optimization. Utility Model Content

[0004] In view of this, the present invention provides an inertial navigation system suitable for 50 fiber optic gyroscopes, which optimizes the structural layout and makes the structure more compact.

[0005] The present invention adopts the following technical solution:

[0006] An inertial navigation system suitable for 50 fiber optic gyroscopes includes a housing assembly, a power supply assembly, an IMU assembly, a circuit board assembly, and a connector assembly.

[0007] The housing assembly includes a base plate, side walls, and a top cover that enclose the cavity;

[0008] The power supply components are fixed on the base plate and include the fiber optic gyroscope power supply, accelerometer power supply, system board power supply and AD board power supply;

[0009] The IMU assembly is fixed to the base plate via an IMU bracket and includes an X-axis fiber optic gyroscope, a Y-axis fiber optic gyroscope, a Z-axis fiber optic gyroscope, an X-axis accelerometer, a Y-axis accelerometer, and a Z-axis accelerometer.

[0010] The circuit board assembly includes a system board bracket fixed to the side of the IMU bracket, a system board fixed to the system board bracket, a dual-purpose bracket fixed to the other opposite side of the IMU bracket, an AD board fixed in the mounting slot of the dual-purpose bracket, and an adapter board fixed to the outside of the dual-purpose bracket.

[0011] The connector assembly is fixed on the IMU bracket, including external connectors fixed on the side wall and transition connectors fixed on the IMU bracket.

[0012] Furthermore, a thermal pad is also provided on the base plate for conducting heat to the fiber optic gyroscope power supply, the accelerometer power supply, the system board power supply, and the AD board power supply, and the system board, the AD board, and the adapter board are arranged perpendicular to the power supply.

[0013] Furthermore, the IMU support is a cubic structure with an open cavity, and the X-axis fiber optic gyroscope, the Y-axis fiber optic gyroscope, and the Z-axis fiber optic gyroscope all extend from the open cavity of the IMU support.

[0014] Furthermore, it also includes an X-axis accelerometer protective cover that covers the top of the X-axis accelerometer.

[0015] Furthermore, the base plate is provided with grooves for installing conductive rubber ropes, grooves for installing the fiber optic gyroscope power supply, the accelerometer power supply, the system board power supply and the AD board power supply, and bosses for installing the IMU bracket;

[0016] The top cover is provided with a groove for installing a conductive rubber rope;

[0017] The sidewall is provided with a groove for installing external connectors and a rectangular groove for weight reduction.

[0018] Furthermore, the transition connector is fixed to the IMU bracket via the left and right transition connector brackets;

[0019] The base plate, the IMU bracket, and the dual-purpose bracket are all provided with threaded holes for mounting wire clamps;

[0020] All installations are secured using screw connections.

[0021] Beneficial effects:

[0022] 1. This utility model arranges the IMU bracket, system board bracket, and dual-purpose bracket together to maximize the use of the internal space of the inertial navigation system, resulting in a compact structure, high space utilization, and small size.

[0023] 2. This utility model places all four power supplies that generate significant heat on the base plate with the best heat dissipation effect, and arranges the system board, AD board, and adapter board perpendicular to the power supplies, thereby minimizing the impact of high-temperature heat sources on the entire system.

[0024] 3. In this utility model, the IMU support is a cubic structure with an open oral cavity. The X-axis fiber optic gyroscope, Y-axis fiber optic gyroscope and Z-axis fiber optic gyroscope all extend from the open oral cavity of the IMU support, resulting in a compact structure.

[0025] 4. An X-axis accelerometer protective cover is installed on top of the X-axis accelerometer to avoid the problem of numerous wires around the X-axis accelerometer touching the pins on the X-axis accelerometer, thus improving the reliability of the structure.

[0026] 5. Both the base plate and the top cover are provided with grooves for installing conductive rubber ropes, which improves the sealing and electromagnetic shielding performance of the inertial navigation system of this utility model.

[0027] 6. The inertial navigation system of this utility model is fixed by screw connection, which is easy to disassemble and replace parts. Attached Figure Description

[0028] Figure 1 This utility model provides a schematic diagram of an inertial navigation system structure suitable for a 50 fiber optic gyroscope;

[0029] Figure 2 This is a schematic diagram from direction A showing the present invention with the side walls and top cover removed, and external connectors removed;

[0030] Figure 3 This is a schematic diagram of the present invention with the side walls and top cover removed, and the external connectors removed, from direction B.

[0031] Figure 4 This is a top view of the base plate and four power supplies of this utility model;

[0032] Figure 5 This is a C-axis schematic diagram of the IMU bracket, three fiber optic gyroscopes, and three accelerometers of this utility model;

[0033] Figure 6 This is a schematic diagram along direction D of the IMU bracket, three fiber optic gyroscopes, three accelerometers, and the protective cover for the X-axis accelerometer of this utility model.

[0034] Figure 7This is a schematic diagram of the E-direction of the present invention with the bottom plate, side wall, top cover, external connectors, fiber optic gyroscope power supply, accelerometer power supply, system board power supply, and AD board power supply removed.

[0035] The components are as follows: 1 - Base plate; 2 - Side wall; 3 - Top cover; 4 - External connector; 5 - Fiber optic gyroscope power supply; 6 - Accelerometer power supply; 7 - System board power supply; 8 - AD board power supply; 9 - IMU bracket; 10 - X-axis fiber optic gyroscope; 11 - Y-axis fiber optic gyroscope; 12 - Z-axis fiber optic gyroscope; 13 - X-axis accelerometer; 14 - Y-axis accelerometer; 15 - Z-axis accelerometer; 16 - X-axis accelerometer protective cover; 17 - System board bracket; 18 - System board; 19 - Dual-purpose bracket; 20 - AD board; 21 - Adapter board; 22 - Transition connector left bracket; 23 - Transition connector right bracket; 24 - Transition connector. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Reference Figures 1 to 7 An inertial navigation system suitable for 50 fiber optic gyroscopes includes a housing assembly, a power supply assembly, an IMU assembly, a circuit board assembly, and a connector assembly, wherein:

[0038] The housing assembly includes a base plate 1, side walls 2, and a top cover 3 that enclose the cavity; the power supply assembly is fixed on the base plate 1, and specifically includes a fiber optic gyroscope power supply 5, an accelerometer power supply 6, a system board power supply 7, and an AD board power supply 8; the IMU assembly is fixed on the base plate 1 via an IMU bracket 9, and specifically includes an X-axis fiber optic gyroscope 10, a Y-axis fiber optic gyroscope 11, a Z-axis fiber optic gyroscope 12, an X-axis accelerometer 13, a Y-axis accelerometer 14, and a Z-axis accelerometer 15; the circuit board assembly includes a system board bracket 17 fixed on the side of the IMU bracket 9, a system board 18 fixed on the system board bracket 17, a dual-purpose bracket 19 fixed on the opposite side of the IMU bracket 9, an AD board 20 fixed in the mounting slot of the dual-purpose bracket 19, and an adapter plate 21 fixed on the outside of the dual-purpose bracket 19; the connector assembly is fixed on the IMU bracket 9, including an external connector 4 fixed on the side wall 2 and a transition connector 24 fixed on the IMU bracket 9.

[0039] This utility model arranges the IMU bracket 9 together with the system board bracket 17 and the dual-purpose bracket 19 to maximize the use of the internal space of the inertial navigation system. It has a compact structure, high space utilization, and small size (the inertial navigation system provided in this embodiment has the following dimensions: length 160mm * width 130mm * height 140mm).

[0040] As an example, in this embodiment, a thermal pad is also provided on the base plate 1 to conduct heat to the fiber optic gyroscope power supply 5, accelerometer power supply 6, system board power supply 7, and AD board power supply 8. Furthermore, the system board 18, AD board 20, and adapter board 21 are arranged perpendicular to the power supplies. In this way, all four power supplies that generate significant heat are placed on the base plate 1, which has the best heat dissipation effect, and the system board 18, AD board 20, and adapter board 21 are arranged perpendicular to the power supplies, minimizing the impact of high-temperature heat sources on the entire system.

[0041] As an example, in this embodiment, the IMU support 9 is a cubic structure with an open cavity. The X-axis fiber optic gyroscope 10, the Y-axis fiber optic gyroscope 11, and the Z-axis fiber optic gyroscope 12 all extend from the open cavity of the IMU support 9, resulting in a compact structure.

[0042] As an example, this embodiment also includes an X-axis accelerometer protective cover 16 covering the top of the X-axis accelerometer 13. This avoids the problem of the many wires around the X-axis accelerometer 13 touching the pins on the X-axis accelerometer 13, thus improving the reliability of the structure.

[0043] As an example, in this embodiment, the base plate 1 has grooves for mounting conductive rubber ropes, grooves for mounting fiber optic gyroscope power supplies 5, accelerometer power supplies 6, system board power supplies 7, and AD board power supplies 8, and a boss for mounting the IMU bracket 9; the top cover 3 has grooves for mounting conductive rubber ropes; the side wall 2 has grooves for mounting external connectors 4 and rectangular grooves for weight reduction. Both the base plate 1 and the top cover 3 have grooves for mounting conductive rubber ropes, improving the sealing and electromagnetic shielding performance of the inertial navigation system.

[0044] As an example, in this embodiment, the transition connector 24 is fixed to the IMU bracket 9 via the transition connector left bracket 22 and the transition connector right bracket 23; the base plate 1, the IMU bracket 9, and the dual-purpose bracket 19 are all provided with threaded holes for installing cable clamps; the fixing method is screw connection.

[0045] It should be noted that System Board 18 is the core component of the inertial navigation system. It typically processes data from the inertial measurement unit (IMU), including acceleration and angular velocity information. System Board 18 calculates the vehicle's velocity and position using built-in algorithms and may include fusion processing with other sensor data, such as GPS data. It is also responsible for controlling and coordinating the operation of the entire system, including power management, data processing, and communication interfaces. AD Board 20, or analog-to-digital converter board, primarily converts analog signals (such as signals from accelerometers and gyroscopes) in the inertial navigation system into digital signals. These digital signals can then be further processed and analyzed by System Board 18. AD Board 20 is crucial for ensuring the system can accurately read and interpret sensor data. In the inertial navigation system, these two boards work together to ensure the system provides accurate navigation and positioning information. System Board 18 processes digital signals and performs navigation calculations, while AD Board 20 is responsible for converting analog signals into digital signals for System Board 18 to process.

[0046] As an example, in this embodiment, the installation steps for an inertial navigation system suitable for a 50 fiber optic gyroscope are as follows:

[0047] Step 1: Power supply assembly installation: First, apply a thin layer of thermal grease evenly to both sides of the high-power thermal pad. Then, attach the fiber optic gyroscope power supply 5, accelerometer power supply 6, system board power supply 7, and AD board power supply 8 to the high-power thermal pad respectively, and fix them to the fiber optic gyroscope power supply mounting slot, accelerometer power supply mounting slot, system board power supply mounting slot, and AD board power supply mounting slot on the base plate 1 respectively with screws.

[0048] Step 2: Installation of IMU components: Secure the X-axis fiber optic gyroscope 10, Y-axis fiber optic gyroscope 11, Z-axis fiber optic gyroscope 12, X-axis accelerometer 13, Y-axis accelerometer 14, and Z-axis accelerometer 15 to the X-axis fiber optic gyroscope mounting surface, Y-axis fiber optic gyroscope mounting surface, Z-axis fiber optic gyroscope mounting surface, X-axis accelerometer mounting surface, Y-axis accelerometer mounting surface, and Z-axis accelerometer mounting surface of the IMU bracket 9 respectively using screws; install the X-axis accelerometer protective cover 16 to the mounting surface of the X-axis accelerometer protective cover 16 of the IMU bracket 9 using screws;

[0049] Step 3: Circuit board assembly installation: First, install the system board bracket 17 and the dual-purpose bracket 19 on opposite sides of the IMU bracket 9 with screws. Then, install the system board 18 on the system board bracket 17 with screws. Install the AD board 20 in the mounting slot of the dual-purpose bracket 19 with screws. Install the adapter board 21 on the outside of the dual-purpose bracket 19 with screws.

[0050] Step 4: Connector assembly installation: First, install the left bracket 22 and the right bracket 23 of the transition connector onto the IMU bracket 9 with screws. Then, install the transition connector 24 onto the left bracket 22 and the right bracket 23 of the transition connector with screws. Install the external connector 4 into the external connector mounting groove on the side wall 2 with screws.

[0051] Step 5: Wiring Connection: First, connect the power cables of the four power supplies, the leads of the three fiber optic gyroscopes, the leads of the three accelerometers, the leads of the system board 18, and the leads of the AD board 20 to the adapter board 21; then connect the leads of the adapter board 21 to the transition connector 24; finally, connect the transition connector 24 to the external connector 4. Secure all wires to the nearest base plate 1, IMU bracket 9, or dual-purpose bracket 19 using wire clips or cable ties.

[0052] Step 6: Assemble the housing components: After evenly applying lubricant to the two conductive rubber ropes, place them into the grooves of the base plate 1 and the top cover 3 respectively. Press the side wall 2 onto the base plate 1 and tighten it with screws. Then press the top cover 3 onto the side wall 2 and tighten it with screws.

[0053] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An inertial navigation system suitable for 50 fiber optic gyroscopes, characterized in that, This includes housing assemblies, power supply assemblies, IMU assemblies, circuit board assemblies, and connector assemblies; The housing assembly includes a bottom plate (1), side walls (2), and a top cover (3) that enclose a closed cavity; The power supply components are fixed on the base plate (1) and include fiber optic gyroscope power supply (5), accelerometer power supply (6), system board power supply (7) and AD board power supply (8); The IMU assembly is fixed on the base plate (1) by the IMU bracket (9), including an X-axis fiber optic gyroscope (10), a Y-axis fiber optic gyroscope (11), a Z-axis fiber optic gyroscope (12), an X-axis accelerometer (13), a Y-axis accelerometer (14), and a Z-axis accelerometer (15); The circuit board assembly includes a system board bracket (17) fixed to the side of the IMU bracket (9), a system board (18) fixed to the system board bracket (17), a dual-purpose bracket (19) fixed to the other opposite side of the IMU bracket (9), an AD board (20) fixed in the mounting groove of the dual-purpose bracket (19), and an adapter plate (21) fixed to the outside of the dual-purpose bracket (19). The connector assembly is fixed on the IMU bracket (9) and includes an external connector (4) fixed on the side wall (2) and a transition connector (24) fixed on the IMU bracket (9).

2. The inertial navigation system suitable for a 50-fiber gyroscope according to claim 1, characterized in that, A heat-conducting pad is also provided on the base plate (1) for conducting heat to the fiber optic gyroscope power supply (5), the accelerometer power supply (6), the system board power supply (7) and the AD board power supply (8), and the system board (18), the AD board (20) and the adapter board (21) are arranged perpendicular to the power supply.

3. An inertial navigation system suitable for a 50-fiber gyroscope according to claim 1, characterized in that, The IMU support (9) is a cubic structure with an open cavity. The X-axis fiber optic gyroscope (10), the Y-axis fiber optic gyroscope (11), and the Z-axis fiber optic gyroscope (12) all extend from the open cavity of the IMU support (9).

4. An inertial navigation system suitable for a 50-fiber gyroscope according to claim 1, characterized in that, It also includes an X-axis accelerometer protective cover (16) that covers the top of the X-axis accelerometer (13).

5. An inertial navigation system suitable for a 50-fiber gyroscope according to claim 1, characterized in that, The base plate (1) is provided with a groove for installing a conductive rubber rope, a groove for installing the fiber optic gyroscope power supply (5), the accelerometer power supply (6), the system board power supply (7) and the AD board power supply (8), and a boss for installing the IMU bracket (9). The top cover (3) is provided with a groove for installing a conductive rubber rope; The sidewall (2) is provided with a groove for installing external connectors (4) and a rectangular groove for weight reduction.

6. An inertial navigation system suitable for a 50-fiber gyroscope according to any one of claims 1 to 5, characterized in that, The transition connector (24) is fixed to the IMU bracket (9) via the left transition connector bracket (22) and the right transition connector bracket (23); The base plate (1), the IMU bracket (9), and the dual-purpose bracket (19) are all provided with threaded holes for installing wire clamps; All installations are secured using screw connections.

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