Inertial navigation accuracy calibration device

Abstract

This utility model discloses an inertial navigation accuracy calibration device, relating to the technical field of positioning system testing equipment. The device includes a connecting plate, an inertial navigation assembly, and a prism assembly. The first side of the connecting plate has multiple first positioning protrusions, on which the inertial navigation assembly and the prism assembly are mounted and supported. The second side of the connecting plate is used for fixed connection with the component to be installed and has a mounting surface. Each first positioning protrusion has a first supporting surface facing the housing of the inertial navigation assembly, and its parallelism with the mounting surface is controlled within 0.03 mm. By setting multiple small-area positioning protrusions on the connecting plate to replace the traditional large-area processing method, the requirements for overall planar accuracy are reduced, making it easier to achieve the flatness and parallelism of the supporting surface through precision machining. This reduces repeated grinding processes, lowers manufacturing difficulty and cost, and improves processing efficiency and product consistency while ensuring high-precision assembly requirements.

Description

Technical Field

[0001] This utility model relates to the technical field of positioning system testing equipment, and in particular to an inertial navigation accuracy calibration device. Background Technology

[0002] In existing technologies, inertial navigation accuracy calibration devices are mainly used for performance evaluation and calibration of inertial navigation systems (INS) to ensure that they can accurately provide position, velocity, and attitude information. However, in practical applications, to guarantee the high precision requirements of the INS, the connecting plate between the INS component and the component to be installed must meet specific precision standards. Specifically, the parallelism and flatness of the upper and lower surfaces of the connecting plate must meet the expected, stringent precision values. This is because any minute angular deviation or surface unevenness will directly affect the accuracy of the INS output data, thereby impacting the reliability of the entire navigation system.

[0003] While current inertial navigation system (INS) accuracy calibration devices play a crucial role in improving navigation system performance, achieving the high precision standards required for the aforementioned connecting plates typically necessitates repeated grinding and precision machining, placing stringent demands on manufacturing processes. This process is not only time-consuming and labor-intensive but also increases production costs and technical difficulty. Therefore, within the relevant technical field, effectively simplifying the manufacturing process of such connecting plates while ensuring they meet the stringent accuracy requirements of INS systems has become an urgent problem to be solved. Utility Model Content

[0004] The main objective of this invention is to provide an inertial navigation accuracy calibration device, which aims to simplify the manufacturing process of the connecting plate while ensuring that it meets the stringent accuracy requirements of the inertial navigation system.

[0005] To achieve the above objectives, the inertial navigation accuracy calibration device proposed in this utility model includes:

[0006] A connecting plate includes a plate body and a plurality of positioning protrusions. The plate body extends horizontally and has a first side and a second side that are opposite each other in a vertical direction. The plurality of positioning protrusions includes a plurality of first positioning protrusions disposed on the first side of the plate body. The second side of the plate body is used for fixed connection with the component to be installed.

[0007] The inertial navigation assembly and the prism assembly are mounted on the first side of the connecting plate and supported by the plurality of first positioning protrusions;

[0008] The plate has a mounting surface on its second side that abuts against the component to be installed. Each of the first positioning protrusions has a first support surface facing the outer shell. The parallelism between each of the first support surfaces and the mounting surface is set to be less than or equal to 0.03 mm.

[0009] In one embodiment, the flatness of each of the first support surfaces and the mounting surfaces is set to be less than or equal to 0.03 mm.

[0010] In one embodiment, the height of the positioning protrusion protruding from the plate is set to h1, where 0.5mm ≤ h1 ≤ 1.5mm.

[0011] In one embodiment, a plurality of first positioning protrusions corresponding to the support of the inertial navigation component are arranged at circumferential intervals along the inertial navigation component.

[0012] In one embodiment, the plurality of positioning protrusions further includes a plurality of second positioning protrusions protruding from a second side of the plate body. The plurality of second positioning protrusions are supported on the component to be installed. Each second positioning protrusion has a second support surface that abuts against the component to be installed, and the plurality of second support surfaces form the mounting surface.

[0013] In one embodiment, the plurality of second positioning protrusions are arranged at intervals along the circumference of the plate.

[0014] In one embodiment, the inertial navigation assembly includes a housing and an inertial navigation system disposed within the housing. The housing has a plurality of third positioning protrusions protruding from its side facing the connecting plate, and the plurality of third positioning protrusions are respectively disposed corresponding to the plurality of first positioning protrusions.

[0015] In one embodiment, a recessed groove is provided on the first and / or second side of the connecting plate, and the plurality of positioning protrusions are defined between the sidewalls of the recessed groove.

[0016] In one embodiment, the plate body is provided with a hollowed-out portion.

[0017] In one embodiment, the hollow portion includes heat dissipation holes corresponding to the inertial navigation component and the prism component.

[0018] In this invention, multiple small-area positioning protrusions are provided on one side of the connecting plate to support the inertial navigation assembly and the prism assembly, changing the traditional method of relying on large-area surface processing to meet accuracy requirements. Because the positioning protrusions themselves have a small area, the flatness and parallelism of their supporting surfaces are more easily achieved through precision machining, eliminating the need for repeated grinding of the entire connecting plate surface. This significantly reduces processing difficulty and cost, providing an inertial navigation accuracy calibration device that simplifies the manufacturing process of the connecting plate while ensuring it meets the stringent accuracy requirements of the inertial navigation system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 and Figure 2 A schematic diagram of an embodiment of the inertial navigation accuracy calibration device provided by this utility model;

[0021] Figure 3 for Figure 1 Schematic diagram of the middle connecting plate;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the inertial navigation system component;

[0023] Figure 5 for Figure 1 Top view of the inertial navigation accuracy calibration device;

[0024] Figure 6 for Figure 5 Cross-sectional view of AA in the middle;

[0025] Figure 7 for Figure 6 Enlarged diagram of point B in the middle.

[0026] Explanation of icon numbers:

[0027] 100. Inertial navigation accuracy calibration device; 1. Connecting plate; 11. First side; 12. Second side; 1a. Slot; 1b. Hollowed-out part; 10. Plate body; 20. Positioning protrusion; 201. First positioning protrusion; 202. Second positioning protrusion; 2. Inertial navigation assembly; 21. Outer shell; 22. Third positioning protrusion; 3. Prism assembly.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] To ensure the high precision requirements of the inertial navigation system (INS), the connecting plate between the INS component and the parts to be installed must meet specific precision standards. Specifically, the parallelism and flatness of the upper and lower surfaces of the connecting plate must meet the expected, stringent precision values. Although current INS precision calibration devices play a crucial role in improving navigation system performance, achieving the high precision required for the connecting plate typically necessitates repeated grinding and precision machining, which places high demands on the manufacturing process. This process is not only time-consuming and labor-intensive but also increases production costs and technical difficulty.

[0033] This utility model proposes an inertial navigation accuracy calibration device 100, which aims to provide an inertial navigation accuracy calibration device that can simplify the manufacturing process of the connecting plate while ensuring that it meets the strict accuracy requirements of the inertial navigation system.

[0034] Please see Figures 1 to 3In one embodiment of this utility model, the inertial navigation accuracy calibration device 100 includes a connecting plate 1, an inertial navigation assembly 2, and a prism assembly 3. The connecting plate 1 includes a plate body 10 and a plurality of positioning protrusions 20. The plate body 10 extends horizontally and has a first side 11 and a second side 12 arranged opposite to each other in the vertical direction. The plurality of positioning protrusions 20 include a plurality of first positioning protrusions 201 disposed on the first side 11 of the plate body 10. The second side 12 of the plate body 10 is used for fixed connection with the component to be installed. The inertial navigation assembly 2 and the prism assembly 3 are mounted on the first side 11 of the connecting plate 1 and supported by the plurality of first positioning protrusions 201. The second side 12 of the plate body 10 is provided with a mounting surface that abuts against the component to be installed. Each first positioning protrusion 201 has a first support surface facing the outer shell 21, and the parallelism between each first support surface and the mounting surface is set to be less than or equal to 0.03 mm.

[0035] In practical applications, the connecting plate 1 is made of a metal material with a certain thickness and rigidity, and is flat in shape, extending horizontally. Multiple positioning protrusions 20 are provided on one side of the connecting plate 1. These positioning protrusions 20 can be integrally formed on the plate 10 by machining or casting. The first positioning protrusion 201 has a first support surface for supporting the inertial navigation component 2 and the prism component 3. Because the area of ​​a single positioning protrusion 20 is small, it is easier to ensure the flatness and parallelism of its surface through precision machining. During installation, the inertial navigation component 2 and the prism component 3 are placed and fixed on the support surface of the first positioning protrusion 201, thereby achieving stable support.

[0036] It should be noted that the "first support surface" refers to the surface of the connecting plate 1 where the positioning protrusion 20 supports the inertial navigation component 2 and the prism component 3; the "mounting surface" is the other side of the connecting plate 1, the surface that is in contact with the component to be mounted. "Parallelism" refers to whether the relative positional relationship between two different surfaces is sufficiently parallel.

[0037] The other side (second side 12) of the connecting plate 1 serves as the mounting surface for contacting the component to be installed. This mounting surface must maintain a strict parallel relationship with the support surface of the positioning protrusion 20, with an error controlled within 0.03mm. Since only the parallelism between multiple small-area support surfaces needs to be ensured, rather than the overall accuracy of the entire side of the connecting plate 1, this solution significantly reduces processing difficulty and improves manufacturing efficiency and assembly accuracy compared to the traditional method of requiring large-area grinding to ensure overall flatness and parallelism.

[0038] In this invention, multiple small-area positioning protrusions 20 are provided on one side of the connecting plate 1 to support the inertial navigation component 2 and the prism component 3, changing the traditional method of relying on large-area surface processing to meet accuracy requirements. Because the positioning protrusions 20 themselves have a small area, the flatness and parallelism of their supporting surfaces are easier to achieve through precision machining, eliminating the need for repeated grinding of the entire surface of the connecting plate 1, significantly reducing processing difficulty and cost. This provides an inertial navigation accuracy calibration device 100 that simplifies the manufacturing process of the connecting plate 1 while ensuring it meets the stringent accuracy requirements of the inertial navigation system.

[0039] Specifically, in this embodiment, the flatness of each of the first support surfaces and the mounting surfaces is set to be less than or equal to 0.03 mm.

[0040] Specifically, the flatness of the first support surface of each first positioning protrusion 201 and the mounting surface of the connecting plate 1 for abutting the component to be installed is controlled within 0.03mm. That is to say, when the height difference is measured at any three points on this surface, the maximum deviation will not exceed 0.03mm.

[0041] To achieve this precision requirement, the support and mounting surfaces of the positioning protrusion 20 are typically processed using precision grinding, lapping, or polishing techniques, and quality control can be achieved with the aid of high-precision inspection equipment such as optical interferometers or coordinate measuring machines. Because these surfaces are relatively small and have a concentrated structure, it is easier to achieve the required flatness standard through localized finishing, rather than repeatedly finishing the entire surface of the connecting plate 1 as is required for traditional large flat surfaces.

[0042] Specifically, please refer to Figures 5 to 7 In this embodiment, the height of the positioning protrusion 20 protruding from the plate 10 is set to h1, where 0.5mm≤h1≤1.5mm.

[0043] It should be noted that during the manufacturing process, a CNC milling machine with extremely high rigidity and positioning accuracy is used to partially mill the metal connecting plate 1, creating a countersunk groove 1a structure on its surface. The countersunk groove 1a does not completely remove material; instead, it retains a portion of the uncut area. This uncut portion forms the positioning protrusion 20, creating a small protrusion relative to the surrounding countersunk groove 1a area. By precisely controlling the depth of the countersunk groove 1a (i.e., controlling the protrusion height h1 of the positioning protrusion 20), it can be ensured that the height of the positioning protrusion 20 is neither too high nor too low.

[0044] Specifically, please refer to Figure 3The connecting plate 1 has at least one recess 1a on its first side 11 and / or second side 12, which is formed by precision milling. Inside the recess 1a, the uncut portions between two adjacent recesses 1a constitute a plurality of positioning protrusions 20. These positioning protrusions 20 are regularly arranged to support the inertial navigation assembly 2 and the prism assembly 3, and to ensure the accuracy and stability of their installation positions.

[0045] By setting a groove 1a structure on the first side 11 and / or the second side 12 of the connecting plate 1, the positioning protrusion 20 is cleverly formed by utilizing the material retention area. This not only achieves the integrated design of the structure, but also avoids the error risks caused by splicing or additional parts in traditional processing.

[0046] Furthermore, by reasonably limiting the height of the positioning protrusion 20 to between 0.5mm and 1.5mm, both mechanical strength and support stability are ensured, while also considering the feasibility of processing convenience and precision control. If the positioning protrusion 20 is too high (above 1.5mm), it is not only prone to collisions and deformation during assembly, but may also lead to unstable support due to excessive structural suspension; conversely, if it is too low (below 0.5mm), it will be difficult to form an effective support interface, and may even fail to achieve precise positioning.

[0047] Further, please refer to Figure 3 In this embodiment, the plurality of first positioning protrusions 201 corresponding to the support of the inertial navigation component 2 are arranged at intervals along the circumference of the inertial navigation component 2. That is, these positioning protrusions 20 are distributed in a ring or near-ring shape around the outer contour of the inertial navigation component 2, and maintain a certain distance.

[0048] In the actual manufacturing process, the positions of multiple positioning protrusions 20 are rationally planned on the connecting plate 1 according to the shape and size of the inertial navigation component 2. For example, if the inertial navigation component 2 has a square structure, a positioning protrusion 20 is set near each of the four corners; if it has a circular structure, several positioning protrusions 20 can be evenly arranged on the circumference. This ensures that the inertial navigation component 2 can be supported by multiple points simultaneously during installation, forming a stable force distribution.

[0049] The height, flatness, and parallelism of each positioning protrusion 20 are precision-machined and tested to ensure that the inertial navigation assembly 2 will not tilt or experience localized stress concentration after placement. The combined action of multiple dispersed but coordinated support points ensures a more stable and reliable installation of the inertial navigation assembly 2 on the connecting plate 1.

[0050] In a further improvement, the connecting plate 1 not only has a first positioning protrusion 201 for supporting the inertial navigation assembly 2 and the prism assembly 3 on its first side 11, but also has a plurality of second positioning protrusions 202 on its second side 12. These second positioning protrusions 202 protrude outward from the plate body 10 of the connecting plate 1 and are used to contact the component to be installed (e.g., a test platform or equipment base).

[0051] Each second positioning protrusion 202 has a second support surface that abuts against the component to be installed. Multiple second support surfaces together constitute the actual contact surface between the connecting plate 1 and the component to be installed, i.e., the "mounting surface." This structural design changes the traditional practice of using the entire side of the connecting plate 1 as the mounting surface, instead using multiple small-area second support surfaces to achieve support and positioning of the connecting plate 1.

[0052] During manufacturing, the second positioning protrusion 202 can be machined using a high-precision CNC milling machine to ensure consistent height, flat surface, and that the parallelism error between each support surface is controlled within the allowable range. Because the second support surface has a smaller area, its surface is easier to make very flat, thus more easily meeting the requirements for high-precision flatness and parallelism. This not only improves the consistency and stability of the contact between the connecting plate 1 and the component to be installed, but also effectively reduces installation errors caused by uneven contact surfaces, thereby improving the reliability of the inertial navigation system calibration results.

[0053] Further improvements are available in the following areas: Figure 2 The multiple second positioning protrusions 202 on the second side 12 of the connecting plate 1 are not randomly distributed, but are arranged at intervals along the circumferential direction of the connecting plate 1 body. That is to say, these positioning protrusions 20 are arranged in a ring or near-ring around the edge area of ​​the connecting plate 1, and maintain a certain spacing.

[0054] Arranging multiple second positioning protrusions 202 at intervals along the circumference of the connecting plate 1 not only improves the stability of the connecting plate 1 during installation but also helps to improve the repeatability of positioning accuracy after multiple disassemblies and reassemblies. At the same time, due to the reasonable distribution of support points and uniform stress, it can also effectively reduce the risk of deformation caused by local stress concentration, thereby ensuring the long-term stability of the entire calibration device during use.

[0055] Further, please refer to Figures 4 to 7 In this embodiment, the inertial navigation component 2 includes a housing 21 and an inertial navigation system disposed within the housing 21. The housing 21 has a plurality of third positioning protrusions 22 protruding from the side facing the connecting plate 1. The plurality of third positioning protrusions 22 are respectively disposed corresponding to the plurality of first positioning protrusions 201.

[0056] It is understood that the inertial navigation component 2 includes a housing 21, which encapsulates an inertial navigation system (such as a gyroscope, accelerometer, and other core components) for measuring attitude, velocity, and position. On the surface of the housing 21 facing the connecting plate 1, there are multiple third positioning protrusions 22, which correspond one-to-one with multiple first positioning protrusions 201 on the connecting plate 1.

[0057] During assembly, the inertial navigation component 2, via a third positioning protrusion 22 on its housing 21, engages with a first positioning protrusion 201 on the connecting plate 1, thereby being supported on the connecting plate 1. The surface of each third positioning protrusion 22 is precision-machined to ensure its height consistency and flatness. Since the third positioning protrusion 22 only contacts the first positioning protrusion 201 in a localized area, only these small areas need high-precision processing to meet the overall installation accuracy requirements. Because the contact area of ​​the third positioning protrusion 22 is small, high-precision flatness and parallelism control is easier to achieve, thus ensuring that the inertial navigation component 2 is in the ideal spatial position after installation.

[0058] With this setup, it is not necessary to perform precision machining on the entire bottom surface of the housing 21. Only a limited number of third positioning protrusions 22 need to be precision machined. This can effectively control the height consistency and parallelism of the inertial navigation component 2 during installation, avoiding the traditional practice of performing large-area precision machining on the entire bottom surface of the housing 21 or the entire surface of the connecting plate 1. This simplifies the manufacturing process and improves assembly efficiency and calibration accuracy.

[0059] Further, please refer to Figure 2 and Figure 3 In this embodiment, the plate 10 is provided with a hollow part 1b.

[0060] It should be noted that the hollow part 1b is formed by machining an opening area on the plate 10. Its shape can be circular, rectangular or polygonal, etc., and the specific design is based on the structural strength requirements and overall layout.

[0061] During manufacturing, the cutout portion 1b can be machined in non-critical load-bearing areas of the connecting plate 1 using methods such as CNC milling, laser cutting, or stamping. These cutout areas do not participate in the installation and support of the inertial navigation component 2 or the prism component 3, and therefore do not affect the main function of the connecting plate 1. At the same time, the cutout positions generally avoid the positioning protrusion 20 and its surrounding critical structures to ensure that the overall rigidity and installation stability of the connecting plate 1 are not affected.

[0062] By properly designing the hollowed-out section 1b, "removing the unnecessary parts" without affecting the core function can effectively reduce weight while maintaining the original strength.

[0063] It should be noted that the inertial navigation component 2 and the prism component 3 will generate a certain amount of heat during operation. If this heat cannot be dissipated in time, it may cause a local temperature rise, which may affect the measurement accuracy of precision optical components or inertial sensors, or even lead to performance drift or system instability.

[0064] Furthermore, in this embodiment, the hollow portion 1b includes heat dissipation holes corresponding to the inertial navigation component 2 and the prism component 3.

[0065] In actual manufacturing, heat dissipation holes can be processed using CNC milling, laser cutting, or stamping. Their shape can be circular, elliptical, or polygonal, and the specific layout is optimized according to the heat source distribution and airflow path.

[0066] By opening special heat dissipation holes on the connecting plate 1, hot air can circulate and be discharged more quickly, effectively reducing the temperature around key components and improving the thermal stability of the entire system.

[0067] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An inertial navigation precision calibration device, characterized in that, include: A connecting plate includes a plate body and a plurality of positioning protrusions. The plate body extends horizontally and has a first side and a second side that are opposite each other in a vertical direction. The plurality of positioning protrusions includes a plurality of first positioning protrusions disposed on the first side of the plate body. The second side of the plate body is used for fixed connection with a component to be installed. The inertial navigation assembly and the prism assembly are mounted on the first side of the connecting plate and supported by the plurality of first positioning protrusions; The plate has a mounting surface on its second side that abuts against the component to be installed. Each of the first positioning protrusions has a first support surface facing the outer shell. The parallelism between each of the first support surfaces and the mounting surface is set to be less than or equal to 0.03 mm.

2. The inertial navigation precision calibration device of claim 1, wherein, The flatness of each of the first support surface and the mounting surface is set to be less than or equal to 0.03 mm.

3. The inertial navigation precision calibration device of claim 1, wherein, The height of the positioning protrusion protruding from the plate is set to h1, where 0.5mm ≤ h1 ≤ 1.5mm.

4. The inertial navigation precision calibration device of claim 1, wherein, The first positioning protrusions, which correspond to and support the inertial navigation component, are arranged at intervals along the circumferential direction of the inertial navigation component.

5. The inertial navigation precision calibration device of claim 1, wherein, The plurality of positioning protrusions further include a plurality of second positioning protrusions protruding from the second side of the plate body. The plurality of second positioning protrusions are supported on the component to be installed. Each second positioning protrusion has a second support surface that abuts against the component to be installed. The plurality of second support surfaces form the mounting surface.

6. The inertial navigation precision calibration device of claim 5, wherein, The plurality of second positioning protrusions are arranged at intervals along the circumference of the plate.

7. The inertial navigation precision calibration device of claim 1, wherein, The inertial navigation assembly includes a housing and an inertial navigation system disposed within the housing. The housing has a plurality of third positioning protrusions protruding from its side facing the connecting plate, and the plurality of third positioning protrusions are respectively disposed corresponding to the plurality of first positioning protrusions.

8. The inertial navigation precision calibration device of claim 1, wherein, The first and / or second sides of the connecting plate are recessed with grooves, and the plurality of positioning protrusions are defined between the sidewalls of the grooves.

9. The inertial navigation precision calibration device of claim 1, wherein, The plate has a hollowed-out section.

10. The inertial navigation precision calibration device of claim 9, wherein, The hollowed-out portion includes heat dissipation holes corresponding to the inertial navigation component and the prism component.

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