An inertial navigation product test fixture and dynamic test system

Abstract

The utility model relates to a kind of inertial navigation product test tool and dynamic test system, inertial navigation product test tool, including support platform and down-pressing positioning assembly;The support platform has for installing benchmark navigation module and the benchmark surface of supporting inertial navigation product;The down-pressing positioning assembly includes pressing strip, connecting screw rod and connecting nut, the bottom end of connecting screw rod passes through the pressing strip and is detachably connected with the support platform, connecting screw rod is connected with the connecting nut, the connecting nut is abutted with the top of the pressing strip, and the pressing gap for adapting clamping inertial navigation product is formed between pressing strip and the benchmark surface;By adjusting the height of connecting nut, the maximum uplink height of pressing strip can be controlled, that is, the size of the pressing gap between pressing strip and benchmark surface is controlled, to adapt to inertial navigation product of different sizes, and the versatility is strong, meanwhile, pressing strip can simultaneously press multiple inertial navigation products, effectively improve test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of inertial navigation product testing technology, and in particular to an inertial navigation product testing fixture and dynamic testing system. Background Technology

[0002] Currently, performance testing of inertial navigation products mainly includes two methods: static testing and dynamic testing. The dynamic testing system consists of a host computer, a reference navigation module, test cables, a power supply module, a regulated power supply, and a mobile platform, which enables performance testing of parameters such as position, velocity, and attitude of inertial navigation products under dynamic conditions.

[0003] For example, the utility model patent with application number CN202320447870.8 proposes a high-precision turntable fixture with a backing surface. This fixture includes a base plate with recessed holes on its front side, and a series of such recessed holes. A through hole is formed at the rear of the inner cavity of each recessed hole. A backing plate is fixedly connected to one side of the front side of the base plate, and a groove is formed at the bottom of the outer surface of the base plate. This utility model relates to the field of turntable fixture technology. This high-precision turntable fixture with a backing surface provides an installation reference for inertial navigation products through its base plate. For rough machining, rough milling of the outer and inner surfaces of the calibration fixture allows for the retention of appropriate allowances for stability treatment, effectively releasing machining stress. For semi-finishing, it can mill the protrusions on the outer wall and inner cavity of the calibration fixture, further reducing machining allowances. This results in a small fixture size, making it suitable for diverse inertial navigation calibration work and greatly improving reusability.

[0004] However, the aforementioned tooling is only compatible with inertial navigation products of a single size, has low versatility, and can only accommodate a limited number of inertial navigation products in a single test, resulting in low testing efficiency. Utility Model Content

[0005] In view of this, it is necessary to provide an inertial navigation product testing fixture and a dynamic testing system to solve the problems that the above-mentioned fixture is only suitable for inertial navigation products of a single size, has low versatility, and can only accommodate a limited number of inertial navigation products in a single test, resulting in low testing efficiency.

[0006] On one hand, this utility model provides a testing fixture for an inertial navigation product, including a support platform and a pressing and positioning component; the support platform has a reference surface for installing a reference navigation module and supporting the inertial navigation product; the pressing and positioning component includes a pressure bar, a connecting screw, and a connecting nut, the bottom end of the connecting screw passes through the pressure bar and is detachably connected to the support platform, the connecting screw is connected to the connecting nut, the connecting nut abuts against the top of the pressure bar, and a clamping gap is formed between the pressure bar and the reference surface for adapting and clamping the inertial navigation product.

[0007] Furthermore, a groove extending along its length is provided at the center of the pressure strip, the connecting screw passes through the groove and can slide to any position in the groove, and the width of the groove is smaller than the outer diameter of the connecting nut.

[0008] Furthermore, the bottom end of the connecting screw is connected to a threaded hole on the support platform.

[0009] Furthermore, there are multiple threaded holes, and the connecting screw can be connected to any of the threaded holes.

[0010] Furthermore, there are multiple connecting screws, which are arranged sequentially along the length of the pressure bar, and the number of connecting nuts corresponds to the number of connecting screws.

[0011] Furthermore, there are two connecting screws, which are disposed at both ends of the pressure strip, and the middle part of the pressure strip is used to abut against the inertial navigation product.

[0012] Furthermore, the number of connecting screws is three, with two connecting screws located at both ends of the pressure bar and the other connecting screw located in the middle of the pressure bar.

[0013] Furthermore, the pressing positioning component also includes an auxiliary nut, which is disposed on the connecting screw, and the bottom of the auxiliary nut abuts against the reference surface of the support platform.

[0014] On the other hand, this utility model embodiment provides a dynamic testing system, including the inertial navigation product testing fixture as described above, and also including a mobile platform, with the support platform installed on the mobile platform.

[0015] Furthermore, it also includes a data acquisition module, a data transmission module, a data parsing module, a human-computer interaction module, and a power supply module, all installed on the mobile platform. The data acquisition module is electrically connected to the reference navigation module and the inertial navigation product for receiving data information. The data acquisition module is electrically connected to the data parsing module via the data transmission module for transmitting and parsing data. The data parsing module and the human-computer interaction module are electrically connected to the reference navigation module, the inertial navigation product, and the data parsing module for issuing commands, setting parameters, serial port connection, and providing test result feedback. The power supply module is electrically connected to the data acquisition module, data transmission module, data parsing module, human-computer interaction module, reference navigation module, and inertial navigation product for supplying power.

[0016] Compared with existing technologies, the maximum upward height of the pressure bar can be controlled by adjusting the height of the connecting nut, which controls the size of the clamping gap between the pressure bar and the reference surface, so as to adapt to inertial navigation products of different sizes. It has strong versatility. At the same time, the pressure bar can clamp multiple inertial navigation products at the same time, which effectively improves the testing efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the inertial navigation product testing fixture provided in this embodiment of the utility model. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0019] like Figure 1 As shown, in one aspect, this utility model provides an inertial navigation product testing fixture, including a support platform 100 and a pressing positioning component 200; the support platform 100 has a reference surface for installing a reference navigation module M and supporting an inertial navigation product N; the pressing positioning component 200 includes a pressure bar 210, a connecting screw 220 and a connecting nut 230, the bottom end of the connecting screw 220 passes through the pressure bar 210 and is detachably connected to the support platform 100, the connecting screw 220 is connected to the connecting nut 230, the connecting nut 230 abuts against the top of the pressure bar 210, and a clamping gap is formed between the pressure bar 210 and the reference surface for adapting and clamping the inertial navigation product N.

[0020] During implementation, the maximum upward height of the pressure bar 210 can be controlled by adjusting the height of the connecting nut 230, which controls the size of the clamping gap between the pressure bar 210 and the reference surface, so as to adapt to inertial navigation products N of different sizes. It has strong versatility. At the same time, the pressure bar 210 can clamp multiple inertial navigation products N at the same time, which effectively improves the testing efficiency.

[0021] The support platform 100 in this embodiment has a reference plane for installing the reference navigation module M and supporting the inertial navigation product N, so as to ensure that the reference navigation module M and the inertial navigation product N are aligned in the horizontal direction.

[0022] In one embodiment, the bottom end of the connecting screw 220 is engaged with the threaded hole 110 on the support platform 100. Of course, in other preferred embodiments, the connecting screw 220 can also be connected to the through hole on the support platform 100 by means of plug-in or other methods. There is no limitation on this, as long as the connection is stable and easy to assemble and disassemble.

[0023] In one embodiment, a limiting protrusion 120 is provided on the support platform 100 to indicate the installation reference on one side of the inertial navigation product N, so as to quickly locate the installation position of the inertial navigation product N.

[0024] It should be noted that the structure of the reference navigation module M is the same as that of the inertial navigation product N. Both are used for performance testing of parameters such as position, velocity, and attitude. The reference navigation module M provides a benchmark for test parameters for the inertial navigation product N. By comparing the test data fed back by the inertial navigation product N with the test data fed back by the reference navigation module M, the performance of the inertial navigation product N can be determined.

[0025] The pressing positioning component 200 in this embodiment includes a pressure bar 210, a connecting screw 220, and a connecting nut 230. The bottom end of the connecting screw 220 passes through the pressure bar 210 and is detachably connected to the support platform 100. The connecting screw 220 is connected to the connecting nut 230, and the connecting nut 230 abuts against the top of the pressure bar 210. A clamping gap is formed between the pressure bar 210 and the reference surface for adapting and clamping the inertial navigation product N.

[0026] The pressure strip 210 has a long strip structure, which can press down multiple inertial navigation products N at one time. At the same time, it is detachably connected to the support platform 100 through the connecting screw 220, so as to adjust the installation direction of the pressure strip 210.

[0027] To ensure a more uniform downward pressure on the inertial navigation product N, in one embodiment, a groove 211 extending along its length is provided at the center of the pressure strip 210. The connecting screw 220 passes through the groove 211 and can slide to any position within it. The width of the groove 211 is smaller than the outer diameter of the connecting nut 230. During installation, efforts should be made to ensure that the inertial navigation product N is located at the center point of force application on the pressure strip 210.

[0028] In one embodiment, there are multiple threaded holes 110, and the connecting screw 220 can be connected to any of the threaded holes 110. It is understood that by connecting the connecting screw 220 to the threaded holes 110 at different locations, the position of the pressure strip 210 relative to the reference surface can be adjusted, thereby adapting to the installation requirements of different positions of the inertial guide rail product.

[0029] In this embodiment, there are multiple connecting screws 220, which are arranged sequentially along the length of the pressure strip 210, and the number of connecting nuts 230 corresponds to the number of connecting screws 220.

[0030] In one embodiment, there are two connecting screws 220, which are disposed at both ends of the pressure strip 210, and the middle part of the pressure strip 210 is used to abut against the inertial navigation product N.

[0031] In another embodiment, there are three connecting screws 220, two of which are located at both ends of the pressure strip 210, and the third connecting screw 220 is located in the middle of the pressure strip 210. The two connecting screws on both sides are slidably connected to two sliding grooves 211 on the pressure strip 210, and the middle connecting screw 220 is slidably connected to a central limiting groove 212 in the middle portion of the pressure strip 210.

[0032] The above settings ensure that the inertial navigation product N is positioned close to the middle of the line connecting two adjacent connecting screws 220.

[0033] To prevent the connecting screw 220 from shifting or moving downward, in one embodiment, the pressing positioning assembly 200 further includes an auxiliary nut 240, which is disposed on the connecting screw 220 and whose bottom abuts against the reference surface of the support platform 100.

[0034] On the other hand, this utility model embodiment provides a dynamic testing system, including the inertial navigation product N testing fixture as described above, and also includes a mobile platform, with the support platform 100 installed on the mobile platform.

[0035] The mobile platform can be a vehicle, ship, aircraft, or other similar structure. To reduce costs, the mobile platform is typically a van-type vehicle, providing a carrier and dynamic environment for the power supply module, data acquisition module, data transmission module, reference navigation module, and human-machine interaction module. The mobile platform has a driver's seat and an operator's seat, and is equipped with a mounting base. All the system's hardware modules are assembled on this mounting base.

[0036] In one embodiment, the support platform 100 has a stepped hole 130, and the support platform 100 is installed onto the mobile platform by connecting screws or other connectors passing through the stepped hole 130.

[0037] This embodiment also includes a data acquisition module, a data transmission module, a data parsing module, a human-computer interaction module, and a power supply module, all installed on the mobile platform. The data acquisition module is electrically connected to the reference navigation module M and the inertial navigation product N to receive data information. The data acquisition module is electrically connected to the data parsing module via the data transmission module to transmit and parse data. The data parsing module and the human-computer interaction module are electrically connected to the reference navigation module M, the inertial navigation product N, and the data parsing module to issue commands, set parameters, connect serial ports, and provide test result feedback. The power supply module is electrically connected to the data acquisition module, the data transmission module, the data parsing module, the human-computer interaction module, the reference navigation module M, and the inertial navigation product N to provide power.

[0038] The data acquisition module includes a serial port board and an industrial control computer. It primarily collects and processes data from the inertial navigation product N, the reference navigation module M, and the data transmission module. Data acquisition is achieved using a serial port board, which, when connected to a test cable, has multiple RS422 serial ports. This allows for the simultaneous acquisition of measurement data from the reference navigation module M (a high-precision integrated navigation system), instruction data from the data processing board, and measurement data from multiple sets of inertial navigation products N. Data processing is handled by an industrial control computer that is shock-resistant, moisture-proof, and offers high data processing efficiency.

[0039] The data transmission module includes a data transmission board and supporting cables. It mainly transmits the host computer command data to the inertial navigation product N according to the specified timing sequence. At the same time, it transmits the measurement data of the inertial navigation product N and the measurement data of the reference navigation module M (high-precision integrated navigation system) to the serial port board for data acquisition. The data transmission board has a precise timed data transmission function.

[0040] The data parsing module processes the collected data according to the prescribed data parsing protocol, calculation formula and algorithm, and realizes the functions of recording, solving, analyzing and comparing the data information of the collected inertial navigation product N and the reference navigation module M, and outputting the final results.

[0041] The human-computer interaction module includes test host computer software, LCD display and computer input device. It mainly performs command issuance, parameter setting, serial port connection and test result feedback for inertial navigation product N and reference navigation module M. The test host computer software is developed using a programming language and has the characteristics of high integration, command sending and test result visualization.

[0042] The power supply module comprises a portable power bank, a DC regulated power supply, and related power cables. It primarily powers the data acquisition and processing module, data transmission module, reference navigation module M, human-machine interface module, and terminal display module. The module receives 220V AC power from the portable power bank and an adjustable voltage from the DC regulated power supply, with a set current limit to ensure power supply safety.

[0043] Workflow: 1) Route planning: Depending on the testing requirements, closed loop routes, straight lines, curved routes, etc. can be selected. Try to choose open road sections or internal roads with fewer vehicles. 2) Hardware connection: Install the reference navigation module M and the inertial navigation product N on the test fixture; 3) System settings: Turn on the power supply and the regulated power supply, set the power supply voltage for the inertial navigation product N and the reference navigation module M, turn on the industrial control computer and the test host computer, set the baud rate of the serial port of the navigation component and the serial port of the reference navigation module M, and select the corresponding serial port number to open the serial port; 4) Align the reference navigation module M. After confirming that the cable connection and power supply are correct, close the power switch of the reference navigation module M. Keep the mobile platform in the off state, click the reference navigation module M alignment. When the "alignment" indicator on the host computer turns green, the alignment is complete (do not cause any excitation interference to the mobile platform during the alignment of the reference navigation module M). 5) Start the test. Close the N power switch of the inertial navigation product and start the vehicle. After the vehicle starts moving, click the "Self-test", "Align", "Turn to Navigation" and "Muzzle" commands in sequence on the test host computer interface. When the indicator lights of the corresponding commands turn green in sequence, the corresponding commands are responding normally. If the indicator light turns red, it means that there is no feedback for the corresponding command. If the indicator light turns yellow, it means that the command is abnormal. 6) Start recording data. After all the above commands have returned normal feedback, click the "Start Recording" command to record the test data. 7) Stop recording data. After the test is completed, click the "Stop Recording" command. The host computer will automatically calculate the test results and display them in the corresponding position on the host computer interface. 8) The test ends, the inertial navigation product N and the reference navigation module M are powered off, and the mobile platform stops (position, speed and attitude).

[0044] Compared with existing technologies: 1) High versatility: For testing needs of products of different sizes, the inertial navigation product N can be installed using screws or pressure strips 210, providing flexible installation methods; the testing system is compatible with different models of inertial navigation products N. 2) Higher efficiency: The dynamic testing system can test multiple inertial navigation products N simultaneously, and can quickly and efficiently process, analyze and visualize the test data, effectively improving testing efficiency.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A testing fixture for inertial navigation products, characterized in that, include: The support platform has a reference surface for installing the reference navigation module and supporting the inertial navigation product; The pressure positioning assembly includes a pressure bar, a connecting screw, and a connecting nut. The bottom end of the connecting screw passes through the pressure bar and is detachably connected to the support platform. The connecting screw is engaged with the connecting nut, and the connecting nut abuts against the top of the pressure bar. A clamping gap is formed between the pressure bar and the reference surface for adapting and clamping inertial navigation products.

2. The inertial navigation product test fixture of claim 1, wherein, The center of the pressure strip has a groove extending along its length. The connecting screw passes through the groove and can slide to any position in the groove. The width of the groove is smaller than the outer diameter of the connecting nut.

3. The inertial navigation product test fixture of claim 1, wherein, The bottom end of the connecting screw is connected to a threaded hole on the support platform.

4. The inertial navigation product test fixture of claim 3, wherein, The number of threaded holes is multiple, and the connecting screw can be connected to any of the threaded holes.

5. The inertial navigation product test fixture of claim 1, wherein, The number of connecting screws is multiple, and the multiple connecting screws are arranged sequentially along the length direction of the pressure bar. The number of connecting nuts corresponds to the number of connecting screws.

6. The inertial navigation product test fixture of claim 5, wherein, The number of connecting screws is two, and the two connecting screws are disposed at both ends of the pressure strip. The middle part of the pressure strip is used to abut against the inertial navigation product.

7. The inertial navigation product testing fixture according to claim 5, characterized in that, The number of connecting screws is three, with two connecting screws located at both ends of the pressure strip and the other connecting screw located in the middle of the pressure strip.

8. The inertial navigation product test fixture of claim 1, wherein, The pressing and positioning assembly also includes an auxiliary nut, which is disposed on the connecting screw and the bottom of the auxiliary nut abuts against the reference surface of the support platform.

9. A dynamic test system, characterized by The system includes the inertial navigation product testing fixture as described in any one of claims 1-8, and also includes a mobile platform, wherein the support platform is mounted on the mobile platform.

10. The dynamic testing system of claim 9, wherein, It also includes a data acquisition module, a data transmission module, a data parsing module, a human-computer interaction module, and a power supply module, all installed on the mobile platform. The data acquisition module is electrically connected to the reference navigation module and the inertial navigation product for receiving data information. The data acquisition module is electrically connected to the data parsing module via the data transmission module for transmitting and parsing data. The data parsing module and the human-computer interaction module are electrically connected to the reference navigation module, the inertial navigation product, and the data parsing module for issuing commands, setting parameters, serial port connection, and test result feedback. The power supply module is electrically connected to the data acquisition module, data transmission module, data parsing module, human-computer interaction module, reference navigation module, and inertial navigation product for supplying power.

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