A miniaturized inertial measurement assembly with wire-free connections

Abstract

The application relates to a miniaturized fiber-optic inertial measurement assembly without wire connection, which comprises a three-axis fiber-optic gyroscope, a quartz accelerometer assembly, a table body, an outer cover component, a signal processing plate, a power supply assembly and a signal switching plate; the three-axis fiber-optic gyroscope is installed on two vertical surfaces and a horizontal surface of the table body; the quartz accelerometer assembly is installed on an internal horizontal surface of the table body; the outer cover component is installed on a peripheral horizontal surface of the table body; the signal processing plate is installed on a vertical surface of the table body; the power supply assembly is installed on a bottom surface of the table body; and the signal switching plate is installed at a central position in a cavity of the table body. The application adopts a modular design, mainly takes the table body as a structure support, and installs other modular functional components on the table body; electrical connection of all functional modules is realized through a wire-free connection mode, and a complete fiber-optic inertial measurement assembly is formed.

Description

Technical Field

[0001] This invention belongs to the field of inertial navigation technology, and particularly relates to a miniaturized inertial measurement unit without wire connections. Background Technology

[0002] Fiber optic inertial measurement units (IMUs) are core components of navigation and control systems, used to measure acceleration and angular velocity information along the three axes of the carrier coordinate system. They offer advantages such as high reliability, long service life, wide dynamic range, and fast start-up speed, and are widely used in various fields including land, sea, air, and space. Currently, connecting the various functional modules in miniaturized IMUs using wires remains the mainstream method for signal transmission. However, the complex wires occupy a significant amount of space, and the reduced reliability due to wire soldering, the complex assembly process, and the voltage drop caused by the long wires are unavoidable problems. Therefore, directly connecting the various functional modules via connectors is an effective way to solve these problems and an important pathway to miniaturizing IMUs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a miniaturized fiber optic inertial measurement unit with no wire connection that can significantly reduce the space occupied by the wires themselves and reduce the structural complexity caused by wiring.

[0004] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0005] A miniaturized fiber optic inertial measurement unit without wire connections is characterized by comprising a platform, a three-axis fiber optic gyroscope, a quartz accelerometer assembly, a signal processing board, a signal adapter board, a power supply assembly, and an outer casing.

[0006] The three-axis fiber optic gyroscope includes three ring assemblies, a light source circuit board, a demodulation circuit board, and a gyroscope signal connector. The three ring assemblies are respectively installed on the rear side, right side, and top side of the platform. The demodulation circuit board and the light source circuit board are arranged vertically and directly connected by a double row of pins. Both are installed above the top ring assembly. The gyroscope signal connector is connected to the light source circuit board.

[0007] The quartz accelerometer assembly is installed on the horizontal surface inside the platform and includes an accelerometer bracket, an accelerometer signal acquisition board, three quartz accelerometers, a connector for the power module, and a connector for the signal adapter board. The three accelerometers are vertically mounted in pairs on the upper part of the accelerometer bracket, and the accelerometer signal acquisition board is mounted on the lower part of the accelerometer bracket. The connectors for the power module and the signal adapter board are connected to the accelerometer signal acquisition board.

[0008] The signal adapter board is installed inside the platform above the quartz accelerometer assembly, and includes a base plate A and two connectors on the connecting base plate that connect to the signal processing board, a connector that connects to the quartz accelerometer assembly, and a connector that connects to the three-axis gyroscope.

[0009] The signal processing board is fixedly mounted on the left side of the platform and includes a base plate B, two connectors connecting the signal adapter board, and a connector connecting the outer cover component; the two connectors connecting the signal adapter board and the connector connecting the outer cover component extend into the platform.

[0010] The power supply assembly is installed at the bottom of the platform and includes a bottom cover plate, a power module installed on the upper part of the bottom cover plate, and a connector for connecting the quartz accelerometer assembly. The connector for connecting the quartz accelerometer assembly is connected to the power module.

[0011] The outer casing component is installed on the horizontal surface around the outside of the platform. The outer casing component includes an outer casing, an external interface board, an external connector, and a connector for connecting the signal processing board. The external interface board is installed on the top of the outer casing by screw fastening, and the external connector is installed on the back of the board.

[0012] Furthermore: the platform is a square platform with an extended base plate at the bottom; a square hole is provided on the left side wall of the platform, and six square bosses are provided around the square hole to form the mounting reference surface of the signal processing board. Threaded holes are provided on the six square bosses; four upper mounting bosses are connected to the inner wall of the platform to form the mounting reference surface of the signal adapter board; four lower mounting bosses are connected to the inner wall of the platform to form the mounting reference surface of the quartz accelerometer assembly; a concave plane is provided on the bottom surface of the platform located around the inner cavity to form the mounting reference surface of the power supply assembly; a mounting surface is provided on the top, rear, and right sides of the platform to form the mounting reference surfaces of the three-axis fiber optic gyroscope's three-ring assembly; the upper end surface of the platform's base plate is the mounting reference surface of the outer casing component; four mounting holes are provided on the platform's base plate for the external mechanical interface of the inertial measurement assembly.

[0013] The advantages and positive effects of this invention are as follows:

[0014] 1. The present invention provides a miniaturized inertial measurement unit without wire connections. By utilizing the three-dimensional connection between various circuit boards, it ingeniously achieves rapid mechanical and electrical connections between various modules, avoids redundant wire harness connections, reduces the space occupied by wire harnesses, and achieves the goal of miniaturization of the inertial measurement unit.

[0015] 2. The present invention adopts a direct connection method of connectors, which greatly improves the MTBF (Mean Time Between Failures) of the inertial measurement unit, reduces the wiring and soldering links, lowers the skill requirements of assembly workers, and enables the assembly of the inertial measurement unit to achieve "building block" assembly. Attached Figure Description

[0016] Figure 1 This is a three-dimensional exploded view of the present invention;

[0017] Figure 2 This is a structural diagram of the three-axis fiber optic gyroscope of the present invention;

[0018] Figure 3 This is a structural diagram of the quartz accelerometer assembly of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the platform of the present invention (inverted state);

[0020] Figure 5a This is a schematic diagram of the outer cover component of the present invention in an inverted state;

[0021] Figure 5b This is a schematic diagram of the outer cover component of the present invention in a frontal view;

[0022] Figure 6 This is a schematic diagram of the signal processing board of the present invention;

[0023] Figure 7 This is a schematic diagram of the power supply component of the present invention;

[0024] Figure 8 This is a schematic diagram of the signal adapter board of the present invention;

[0025] Figure 9 This is a schematic diagram of the electrical connections of various parts of the present invention.

[0026] Specific implementation methods

[0027] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0028] This invention designs a miniaturized fiber optic inertial measurement unit without wire connections. Please refer to [link to relevant documentation]. Figures 1-9 The main components include: a three-axis fiber optic gyroscope 1, a quartz accelerometer assembly 2, a platform 3, an outer casing 4, a signal processing board 5, a power supply assembly 6, and a signal adapter board 7. This invention employs a modular design, primarily using the platform as the structural support. All other modular functional components are mounted on the platform, and electrical connections between all functional modules are achieved through a wireless connection method, forming a complete fiber optic gyroscope inertial measurement unit.

[0029] like Figure 1As shown, the three-axis fiber optic gyroscope 1 is mounted on two vertical surfaces of the stage body 3 (the front and right sides in the attached figure, respectively) and the first internal horizontal surface (the top surface in the attached figure); the quartz accelerometer assembly 2 is mounted on the second internal horizontal surface of the stage body 3; the outer casing component 4 is mounted on the outer periphery horizontal surface of the stage body; the signal processing board 5 is mounted on the vertical surface of the stage body (the left side in the attached figure); the power supply assembly 6 is mounted on the bottom surface of the stage body; and the signal adapter board 7 is mounted at the center of the inner cavity of the stage body.

[0030] The three-axis fiber optic gyroscope is the core component of the inertial measurement unit, such as... Figure 2 As shown, the system includes three ring components 101, a light source circuit board 102, a demodulation circuit board 103, and a gyroscope signal connector 104. The three ring components 101 are required to be installed vertically in pairs. The light source circuit board 102 and the demodulation circuit board 103 are required to be directly connected via a double row of pins. The gyroscope signal connector 104 is required to have a guiding function. The gyroscope signal connector 104 is mounted on the light source circuit board 102 and connects to 705 in the signal processing board 7 through an elongated hole in the middle of the platform 3, outputting the angular velocity measured by the three-axis fiber optic gyroscope 1.

[0031] Quartz accelerometer assembly 2 is the core component of the inertial measurement unit, such as... Figure 3 As shown, the device includes an accelerometer bracket 201, an accelerometer signal acquisition board 202, three quartz accelerometers 203, a connector 204 for connecting to a power module, and a connector 205 for connecting to a signal adapter board. The three quartz accelerometers and the accelerometer signal acquisition board are mounted on the upper and lower parts of the accelerometer bracket, respectively. The connectors 204 and 205 are connected to the accelerometer signal acquisition board, with the power module connector facing downwards and the signal adapter board connector facing upwards. The three quartz accelerometers 203 are required to be installed vertically in pairs, and the power module connector 204 and signal adapter board connector 205 are required to have a guiding function.

[0032] The accelerometer signal acquisition board 202 can convert the linear acceleration measured by the accelerometer into an electrical signal output, and the three quartz accelerometers 203 can measure the linear acceleration of the carrier in three directions respectively.

[0033] Platform 3 supports the inertial measurement unit and provides an installation reference for various functional components. For example... Figure 4As shown, the six square bosses 301 on the left side are the mounting references for the signal processing board 5. The four upper mounting bosses 302 connected to the inner wall of the platform are the mounting references for the signal adapter board 7. The four lower mounting bosses 303 connected to the inner wall of the platform are the mounting references for the quartz accelerometer assembly 2. The concave plane 304 located on the bottom surface of the platform and outside the inner cavity is the mounting reference for the power supply assembly 6. The four mounting holes 305 on the bottom plate of the platform are the external mechanical interfaces for the inertial measurement assembly. The upper end face 306 of the bottom plate of the platform is the mounting reference for the outer cover component 4. A mounting surface 307 is provided on the top, front, and right sides of the platform, which are the mounting references for the three-axis fiber optic gyroscope 1. Each mounting reference is required to have the corresponding installation accuracy.

[0034] The outer casing component 4 provides protection for the components inside the inertial measurement unit and provides an electrical interface to the outside, as shown in Figure 5. It includes an outer casing 401, an external interface board 402, an external connector 403, and a connector 404 for connecting to the signal processing board. The external interface board 402 is mounted on top of the outer casing 401 using screws. The external connector 403 is mounted on the back of the board, facing upwards, while the connector 404 for connecting to the signal processing board faces downwards. Connectors with guiding functions should be selected.

[0035] The connector 404, which connects to the signal processing board, transmits the information output by the signal processing board to the external interface board 402. After being expanded by the external interface board 402, the inertial measurement information such as navigation or attitude of the inertial measurement component is output through the external connector 403.

[0036] Signal processing board 5 is responsible for processing navigation information from the inertial measurement unit, such as... Figure 6 As shown, it includes a substrate B501, connectors 502 and 504 for connecting signal adapter boards, and connector 503 for connecting outer casing components, as follows. Figure 4 As shown, the three connectors are required to have a guiding function. The connectors 502 and 504 connecting the signal adapter board and the connector 503 connecting the outer casing component extend into the cavity of the stage body, with the connectors 502 and 504 connecting the signal adapter board facing to the right and the connector 503 connecting the outer casing component facing upward.

[0037] The signal processing board 5 fuses and processes the information from the three-axis fiber optic gyroscope 1 and the accelerometer assembly 2, and then provides navigation or attitude inertial measurement information to the outside world.

[0038] Power supply component 6 is the secondary power supply for the inertial measurement unit, providing power to the various functional modules within the unit, such as... Figure 7 As shown, it includes a bottom cover plate 601, a power module 602 mounted on the upper part of the bottom cover plate, and a connector 603 for the quartz accelerometer assembly. The cover plate 601 is required to provide heat dissipation for the power module 602, and the connector 603 is required to have a guiding function.

[0039] The signal adapter board 7, as the core of circuit transmission, acts as a connecting hub. Through the ingenious arrangement of the signal adapter board, different functional modules are rationally connected using plug-in connectors in different directions, eliminating redundant cable connections, greatly reducing cable space occupation, and lowering the design complexity of the platform 3. Figure 8 As shown. The signal adapter board includes a base plate A701, connectors 702 and 704 for docking with the signal processing board, connector 703 for docking with the quartz accelerometer component, and connector 705 for docking with the three-axis gyroscope. Connectors 702, 703, 704, and 705 are required to have a guiding function. Specifically, connectors 702 and 704 for docking with the signal processing board face left, connector 703 for docking with the quartz accelerometer component faces downwards, and connector 705 for docking with the three-axis gyroscope faces upwards.

[0040] The present invention relates to a miniaturized inertial measurement unit without wire connections. By utilizing the three-dimensional connection between various circuit boards, it ingeniously achieves rapid mechanical and electrical connections between various modules, avoids redundant wiring harness connections, reduces the space occupied by wiring harnesses, and achieves the goal of miniaturization of the inertial measurement unit. This inertial measurement unit (IMU) fully integrates the features of an IMU and a three-axis fiber optic gyroscope. Through a reasonable layout, the external electrical interface (i.e., gyroscope signal connector 104) of the three-axis fiber optic gyroscope 1 is connected wirelessly to the signal adapter board 705 in the system. The IMU places the accelerometer signal acquisition board 202 and the quartz accelerometer 203 in close proximity and installs them in a modular layout. They are connected to the power supply component 603 and the signal adapter board 703 respectively through connectors 204 and 205, achieving wireless connection of accelerometer signals and power supply. The outer casing component 4 integrates the external interface board 402, which is responsible for the electrical interface function of the IMU through connector 403. Connector 404 is wirelessly connected to the signal processing board 503, realizing the interaction between external information and IMU information. The signal processing board 5 processes and transmits navigation information by integrating the signals from the three-axis fiber optic gyroscope 1 and the quartz accelerometer component 2.

[0041] The complete circuit board and connector connection method of the miniaturized inertial measurement unit without wire connections designed in this invention is as follows: Figure 9 As shown, the design of each circuit board and connector cleverly utilizes the space of the inertial measurement unit (IMU). They are directly interconnected via guided connectors, achieving wireless connections between the various functional modules within the IMU. This avoids the space occupied by cables, enables miniaturization of the IMU, further reduces design complexity, simplifies assembly requirements, and significantly improves the reliability and production efficiency of the IMU. Furthermore, this invention alters the constraint method of the circuit board, thereby improving its vibration resistance to a certain extent.

[0042] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A miniature fiber-optic inertial measurement package with wire-free connections, characterized by: The three-axis fiber-optic gyroscope comprises three ring assemblies, a light source circuit board, a demodulation circuit board and a gyroscope signal connector; the three ring assemblies are respectively installed on the rear side, the right side and the top of the base; the demodulation circuit board and the light source circuit board are arranged in a top-bottom manner and directly connected through double-row pins, and both are installed above the top ring assembly; the gyroscope signal connector is connected to the light source circuit board; The quartz accelerometer assembly is installed on the horizontal plane inside the base and comprises an accelerometer support, an accelerometer signal acquisition board, three quartz accelerometers, a connector for plugging with the power module and a connector for plugging with the signal adapter board; the three accelerometers are vertically installed on the upper part of the accelerometer support, the accelerometer signal acquisition board is installed on the lower part of the accelerometer support, and the connector for plugging with the power module and the connector for plugging with the signal adapter board are connected to the accelerometer signal acquisition board; The signal adapter board is installed above the quartz accelerometer assembly inside the base and comprises a base plate A and two connectors for connecting the signal processing board and the quartz accelerometer assembly, a connector for connecting the three-axis gyroscope; The signal processing board is fixedly installed on the left side of the base in a vertical manner and comprises a base plate B, two connectors for connecting the signal adapter board and a connector for connecting the cover component; the two connectors for connecting the signal adapter board and the connector for connecting the cover component extend into the inside of the base; The power module is installed on the bottom of the base and comprises a bottom cover plate, a power module installed on the upper end of the bottom cover plate and a connector for connecting the quartz accelerometer assembly; the connector for connecting the quartz accelerometer assembly is connected to the power module; The cover component is installed on the horizontal plane around the periphery of the base; the cover component comprises a cover, an external interface plate, an external connector and a connector for connecting the signal processing board; the external interface plate is installed on the top of the cover by screw fastening, and the external connector is installed on the back of the plate. The base is a square base provided with an outwardly extending bottom plate on the bottom; a square cutout is provided on the left side wall of the base, six square bosses are provided around the square cutout to form an installation reference surface of the signal processing board, and threaded holes are provided on the six square bosses; four upper installation bosses are connected to the inner cavity wall of the base to form an installation reference surface of the signal adapter board; four lower installation bosses are connected to the inner cavity wall of the base to form an installation reference surface of the quartz accelerometer assembly; a recessed plane is provided on the bottom surface of the base around the periphery of the inner cavity to form an installation reference surface of the power module; an installation surface is provided on the top, the rear side and the right side of the base to form installation reference surfaces of the three ring assemblies of the three-axis fiber-optic gyroscope; the upper end surface of the base plate is an installation reference surface of the cover component; four installation holes are provided on the base plate to form an external mechanical interface of the inertial measurement assembly.

2. The miniaturized fiber optic inertial measurement assembly with leadless connections of claim 1, wherein: ​

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