Navigation device based on fiber-optic gyroscope and MEMS accelerometer and information processing method

Abstract

The invention discloses a navigation device based on a fiber-optic gyroscope and an MEMS (micro-electromechanical system) accelerometer and an information processing method, and solves the technical problems that an inertial navigation component formed by combining the MEMS accelerometer and the fiber-optic gyroscope is still relatively large in size, heat concentration is generated after the MEMS accelerometer and the fiber-optic gyroscope are combined, and accurate output of navigation information is influenced. According to the navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, a digital demodulation circuit board for the three-axis fiber-optic gyroscope and a circuit for processing information of the MEMS accelerometer are integrated on different circuit boards, so that the independence of data output is ensured; the three-axis MEMS accelerometer is arranged in a 2 + 1 distributed mode, namely, a double-axis MEMS chip board and a single-axis MEMS chip board are used together, the space in the table body is reasonably utilized, and the cost and the size are effectively balanced. The three optical fiber ring modules are orthogonally distributed along an inertial coordinate system and are staggered with the three-axis MEMS accelerometer, so that the internal space of the device is reasonably utilized.

Description

TECHNICAL FIELD

[0001] The present application relates to a navigation device and a navigation information processing method, in particular to a navigation device and an information processing method based on a fiber-optic gyroscope and a MEMS accelerometer. BACKGROUND

[0002] The fiber-optic gyroscope is a full solid-state photoelectric inertial instrument, which has the advantages of no moving parts, low cost, impact resistance, high sensitivity, long service life, large dynamic range, short start-up time, and wide precision coverage, and has been widely used in many fields.

[0003] As a high-precision gyroscope, the fiber-optic gyroscope is widely used in inertial navigation components, and it is often combined with a quartz accelerometer to form an inertial navigation component to perform navigation tasks. However, due to the large size and weight of the quartz accelerometer itself, the miniaturization development of the inertial navigation component combined with the fiber-optic gyroscope and the quartz accelerometer is limited.

[0004] With the rapid development of modern science and technology, a miniaturized and lightweight navigation instrument can better adapt to the needs of various miniaturized devices, and it is also convenient to install and integrate into complex systems, thereby reducing the weight and volume of the overall system and improving the performance and efficiency of the system.

[0005] The MEMS accelerometer is a micro-electro-mechanical inertial instrument, which has the characteristics of small size, light weight, and low cost, and has been widely used in consumer electronics, automobiles, and other civilian fields. The MEMS accelerometer can quickly and accurately measure the linear acceleration of an object, supplement the angular velocity information of the fiber-optic gyroscope, and has good measurement linearity. However, in the inertial navigation component combined with the MEMS accelerometer and the fiber-optic gyroscope, due to the variety of specific structural forms of the two, the volume of the inertial navigation component combined with the MEMS accelerometer and the fiber-optic gyroscope is still large, and the combination of the two can easily generate heat concentration, thereby affecting the accurate output of navigation information. SUMMARY

[0006] The purpose of the present application is to solve the technical problem that the inertial navigation component combined with the MEMS accelerometer and the fiber-optic gyroscope has a large volume, and the combination of the two can easily generate heat concentration, thereby affecting the accurate output of navigation information, and to provide a navigation device and an information processing method based on a fiber-optic gyroscope and a MEMS accelerometer.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0008] A navigation device based on fiber-optic gyroscope and MEMS accelerometer, comprising a three-axis fiber-optic gyroscope and a three-axis MEMS accelerometer, the three-axis fiber-optic gyroscope comprising three fiber-optic ring modules, three photoelectric converters, a light source and a light source driving circuit board, wherein the light source driving circuit board is connected with the light source and used to drive the light source to provide light signals for the three fiber-optic ring modules; the three-axis MEMS accelerometer comprises a first MEMS accelerometer chip board and a second MEMS accelerometer chip board connected with the first MEMS accelerometer chip board through a flexible wire, two MEMS accelerometers are integrated on the first MEMS accelerometer chip board, and one MEMS accelerometer is arranged on the second MEMS accelerometer chip board; the special feature is that it further comprises a soft magnetic alloy material base, a digital demodulation circuit board, a temperature sensor and a soft magnetic alloy material cover plate.

[0009] The base is a cuboid frame structure and has six mounting surfaces, and the inside has a light source mounting position and a temperature sensor mounting position.

[0010] The three fiber-optic ring modules are arranged on three mounting surfaces of the base in orthogonal distribution along an inertial coordinate system, and one photoelectric converter of the three photoelectric converters shares one mounting surface with one fiber-optic ring module of the three fiber-optic ring modules.

[0011] The light source mounting surface is provided with heat-conducting silicone grease, the light source is mounted on the light source mounting surface through the heat-conducting silicone grease and tightly adheres to the light source mounting surface.

[0012] The first MEMS accelerometer chip board and the second MEMS accelerometer chip board are orthogonally mounted on any two of the remaining three mounting surfaces of the base which are not provided with the fiber-optic ring modules, and the remaining one mounting surface is used for mounting the remaining two photoelectric converters.

[0013] The temperature sensor is mounted on the temperature sensor mounting position.

[0014] The temperature sensor, the first MEMS accelerometer chip board, the second MEMS accelerometer chip board and the three photoelectric converters are electrically connected with the digital demodulation circuit board.

[0015] The cover plate is connected with the base and used to seal the navigation device based on fiber-optic gyroscope and MEMS accelerometer.

[0016] Further, the cover plate is six cover plates, and the six cover plates are respectively sized to fit the six mounting surfaces of the base.

[0017] Further, the light source is fixed at a middle position of the base, and the light source driving circuit board is fixedly mounted at a position close to the light source in the base.

[0018] Further, the mounting surface of the base body connected with the external device is defined as a bottom surface, and the opposite surface is defined as a top surface, and the bottom surface is provided with the fiber ring module, and the top surface is provided with the second MEMS accelerometer chip board.

[0019] Further, the second MEMS accelerometer chip board is arranged above the light source driving circuit board through the first support frame.

[0020] The second MEMS accelerometer chip board is arranged above the light source driving circuit board through four first screw connecting columns, the bottom ends of the four first screw connecting columns are fixedly connected with the support positions arranged on one side of the bottom surface, the top ends of the four first screw connecting columns are provided with first screw holes, and the second MEMS accelerometer chip board is fixed on the top ends of the four first screw connecting columns through four second screw connecting columns; the top ends of the four second screw connecting columns are provided with second screw holes, and the digital demodulation circuit board is arranged on the top ends of the four second screw connecting columns and above the second MEMS accelerometer chip board through screws.

[0021] Further, the bottom surface is provided with mounting tables at four outer corners, and the base body is provided with mounting notches corresponding to the mounting tables at four corner positions, so as to form mounting channels.

[0022] Further, the base body and the cover plate are made of 1J79 soft magnetic alloy material.

[0023] Further, the surface roughness of the light source mounting surface and the mounting surface corresponding to the light source is 0.8.

[0024] Meanwhile, the application also provides a navigation information processing method based on the fiber-optic gyroscope and the MEMS accelerometer, and the speciality thereof lies in comprising the following steps.

[0025] Step 1: preparing an above-mentioned navigation device based on the fiber-optic gyroscope and the MEMS accelerometer;

[0026] Step 2: making the light source emit light signals, and after the light signals pass through the three fiber ring modules and the three photoelectric transducers, generating electrical signals containing three-axis angular velocity information, and the photoelectric transducers transmit the electrical signals containing the three-axis angular velocity information to the digital demodulation circuit board;

[0027] Step 3: simultaneously with the execution of step 2, the temperature sensor collects the internal temperature of the base body, and transmits the electrical signals containing the temperature information to the digital demodulation circuit board;

[0028] Step 4, while performing step 2, the first MEMS accelerometer chip board, the second MEMS accelerometer chip board generates an electrical signal containing three-axis acceleration information, and processes the electrical signal containing three-axis acceleration information to obtain processed three-axis acceleration information, and transmits the processed three-axis acceleration information to the digital demodulation circuit board;

[0029] Step 5, the digital demodulation circuit board corrects the three-axis angular velocity information obtained in step 2 according to the temperature information obtained in step 3 and the preset correction coefficient corresponding to the different temperature information, to obtain corrected three-axis angular velocity information.

[0030] Step 6, the digital demodulation circuit board outputs the corrected three-axis angular velocity information and the processed three-axis acceleration information as navigation information to an external control end, and completes the navigation information processing.

[0031] Further, step 5 specifically comprises the following steps:

[0032] Step 5.1, the digital demodulation circuit board acquires temperature information collected by the temperature sensor;

[0033] Step 5.2, the digital demodulation circuit board compares the temperature information acquired in step 5.1 with the temperature range corresponding to the preset correction coefficient, to obtain the correction coefficient to be selected for the acquired temperature information.

[0034] Step 5.3, according to the correction coefficient obtained in step 5.2, the three-axis angular velocity information obtained in step 2 is corrected and processed to obtain corrected three-axis angular velocity information.

[0035] Compared with the prior art, the application has the beneficial technical effects as follows:

[0036] 1. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer of the application, by installing the three-axis fiber-optic gyroscope and the three-axis accelerometer in a compact table body and sealing through a cover plate, the inertial navigation device is combined, which can sense the three-axis angular motion and linear motion of the outside world, has the navigation function, has good miniaturization design and mechanical stability, is low in cost, easy to popularize, high in precision under the same volume and weight, and high in cost performance.

[0037] 2. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer of the application, by designing the circuit processing part according to the modularization design, the first MEMS accelerometer chip board, the second MEMS accelerometer chip board and the digital demodulation circuit board are independently designed, and the independence of data output is ensured.

[0038] 3. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, two MEMS accelerometers are integrated on the first MEMS accelerometer chip board, one MEMS accelerometer is designed on the second MEMS accelerometer chip board, that is, a double-axis MEMS chip board and a single-axis MEMS chip board are used together, the space of the platform is reasonably utilized, and the cost and volume are effectively balanced.

[0039] 4. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, three fiber-optic ring modules are distributed orthogonally along the inertial coordinate system, and are staggered with the orthogonally distributed first MEMS accelerometer chip board and the second MEMS accelerometer chip board, the internal space of the platform is reasonably utilized, and the overall size of the navigation device is reduced.

[0040] 5. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, the platform and the cover plate are made of 1J79 soft magnetic alloy material with high magnetic permeability, have good magnetic resistance, can reduce the influence of the external magnetic field on the internal device, improve the precision of the output navigation information, and effectively improve the magnetic field adaptability.

[0041] 6. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, the light source is installed in the middle position inside the platform, the light source mounting surface on the platform is precisely processed, the surface roughness reaches 0.8, the light source can be tightly fitted with the platform after installation, the heat generated by the light source can be quickly conducted to the platform, the metal platform has large heat capacity, and the temperature of the light source can be kept in the appropriate range, so that the light source can work stably.

[0042] 7. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, a temperature sensor is additionally installed inside the platform, the temperature change inside the platform is collected, the temperature sensor is connected with the digital demodulation circuit board, the temperature signal is transmitted to the digital demodulation circuit board, the digital demodulation circuit board controls the stable output of the navigation information through software compensation, reduces the interference of the external temperature change on the navigation device, and effectively improves the temperature adaptability.

[0043] 8. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, the cover plate is designed as six, the six cover plates are respectively installed on the six mounting surfaces of the platform, and are arranged in a split manner, so that the navigation device has good maintainability and is convenient to install and disassemble.

[0044] 9. The navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, the platform frame is set as a concave structure to form an installation channel, which is convenient for the installation of the navigation device and external devices, saves installation space, and is beneficial to the miniaturization development of the navigation device.

[0045] 10. The navigation information processing method based on the fiber-optic gyroscope and the MEMS accelerometer, temperature signals collected by a temperature sensor are transmitted to a digital demodulation circuit board, the digital demodulation circuit board corrects three-axis angular velocity information according to the temperature signals, and the digital demodulation circuit board outputs corrected three-axis angular velocity information and processed three-axis acceleration information to an external control end as navigation information, thereby improving the output precision of the navigation information. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is a structure explosion drawing of the navigation device embodiment based on the fiber-optic gyroscope and the MEMS accelerometer.

[0047] Figure 2 It is a three-dimensional structure schematic diagram of the table body in the navigation device embodiment based on the fiber-optic gyroscope and the MEMS accelerometer.

[0048] Figure 3 It is another three-dimensional structure schematic diagram of the table body in the navigation device embodiment based on the fiber-optic gyroscope and the MEMS accelerometer.

[0049] Figure 4 It is a three-dimensional structure schematic diagram of the navigation device embodiment based on the fiber-optic gyroscope and the MEMS accelerometer (not including the cover plate).

[0050] The reference signs are explained as follows:

[0051] 1, first cover plate; 2, digital demodulation circuit board; 3, second MEMS accelerometer chip board; 4, second cover plate; 5, first fiber-optic ring module; 6, table body; 7, second fiber-optic ring module; 8, third cover plate; 9, first photoelectric converter; 10, light source driving circuit board; 11, light source; 12, second photoelectric converter; 13, third photoelectric converter; 14, fourth cover plate; 15, first MEMS accelerometer chip board; 16, fifth cover plate; 17, third fiber-optic ring module; 18, sixth cover plate. DETAILED DESCRIPTION

[0052] In order to make the purpose, advantages and features of the present application clearer, the following further describes a navigation device and information processing method based on the fiber-optic gyroscope and the MEMS accelerometer in combination with the drawings and specific embodiments.

[0053] The present application is described in detail below in combination with the drawings and specific embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0054] As Figures 1-4As shown, a navigation device based on fiber-optic gyroscope and MEMS accelerometer includes a three-axis fiber-optic gyroscope, a three-axis MEMS accelerometer, a 1J79 soft magnetic alloy material base 6, a digital demodulation circuit board 2, a temperature sensor, and a 1J79 soft magnetic alloy material cover plate. The three-axis fiber-optic gyroscope includes three fiber-optic ring modules, three photoelectric converters, a light source 11, and a light source driving circuit board 10. The light source 11 and the light source driving circuit board 10 are both fixed at the central position of the base 6. The light source driving circuit board 10 is connected with the light source 11 and used to drive the light source 11 to provide light signals for the three fiber-optic ring modules. The three-axis MEMS accelerometer includes a first MEMS accelerometer chip board 15 and a second MEMS accelerometer chip board 3 connected with the first MEMS accelerometer chip board 15 through a flexible wire. Two MEMS accelerometers are integrated on the first MEMS accelerometer chip board 15, and one MEMS accelerometer is on the second MEMS accelerometer chip board 3. The three-axis fiber-optic gyroscope and the three-axis accelerometer are installed in a compact base 6 and sealed by the cover plate to form an inertial navigation device. The device can sense the angular motion and linear motion of three axes, has a navigation function, good miniaturization design and mechanical stability, low cost, and is easy to popularize. The device has high precision and high cost performance under the same volume and weight.

[0055] The base 6 is a cuboid frame structure with six mounting surfaces. The inside of the base 6 has a light source mounting position and a temperature sensor mounting position. The cover plate is six pieces, and the six cover plates are respectively matched in size with the six mounting surfaces of the base 6. The cover plate includes a first cover plate 1, a second cover plate 4, a third cover plate 8, a fourth cover plate 14, a fifth cover plate 16, and a sixth cover plate 18. The six cover plates are respectively mounted on the six mounting surfaces of the base 6. The cover plate is connected with the base 6 and used to seal the navigation device based on fiber-optic gyroscope and MEMS accelerometer.

[0056] Three fiber ring modules are arranged orthogonally on three mounting surfaces of the table body 6, and three photoelectric converters are arranged on the mounting surfaces respectively. The first MEMS accelerometer chip plate 15 and the second MEMS accelerometer chip plate 3 are orthogonally mounted on any two of the three mounting surfaces of the table body 6 which do not mount the fiber ring modules. The mounting surface of the table body 6 which connects with the external device is defined as the bottom surface, and the opposite surface is the top surface. The third fiber ring module 17 is mounted on the bottom surface, the second fiber ring module 7 is mounted on the first side surface connected with the bottom surface, and the first fiber ring module 5 is mounted on the second side surface connected with the first side surface and the bottom surface. The three photoelectric converters include the first photoelectric converter 9, the second photoelectric converter 12 and the third photoelectric converter 13. The first photoelectric converter 9 shares one mounting surface with the third fiber ring module 17, the second photoelectric converter 12 and the third photoelectric converter 13 are mounted on the opposite surface of the first side surface, and the three photoelectric converters are arranged close to the three fiber ring modules respectively. The opposite surface of the second side surface is the third side surface, the first MEMS accelerometer chip plate 15 is mounted on the third side surface, and the second MEMS accelerometer chip plate 3 is mounted on the top surface.

[0057] The light source mounting position is located at the middle position of the cavity of the table body, and the light source mounting surface is provided on the light source mounting position. The light source mounting surface is provided with heat-conducting silicone grease, the light source 11 is mounted on the light source mounting surface through the heat-conducting silicone grease, and is tightly attached to the light source mounting surface. The surface roughness of the light source mounting surface and the mounting surface corresponding thereto on the light source 11 is 0.8. By mounting the light source 11 at the middle position inside the table body 6, and precisely processing the light source mounting surface on the table body 6 to have a surface roughness of 0.8, the light source 11 can be tightly attached to the table body 6 after being mounted, and the heat generated by the light source 11 can be quickly conducted to the table body 6. The metal table body has a large heat capacity, which can ensure that the temperature of the light source 11 is in a suitable range, so that the light source 11 can work stably.

[0058] The temperature sensor is mounted on the temperature sensor mounting position. The temperature sensor, the first MEMS accelerometer chip plate 15, the second MEMS accelerometer chip plate 3 and the three photoelectric converters are electrically connected with the digital demodulation circuit board 2. By mounting the temperature sensor inside the table body 6, the temperature change inside the table body 6 is collected. The temperature sensor is connected with the digital demodulation circuit board 2, and the temperature signal is transmitted to the digital demodulation circuit board 2. The digital demodulation circuit board 2 controls the stable output of the navigation information by software compensation (i.e. using a correction coefficient to correct the three-axis angular velocity information), reduces the interference of the external temperature change on the navigation device based on the fiber-optic gyroscope and the MEMS accelerometer, and effectively improves the temperature adaptability.

[0059] The second MEMS accelerometer chip plate 3 is arranged above the light source driving circuit board 10 through four first screw connecting columns, the bottom ends of the four first screw connecting columns are fixedly connected with the support positions arranged on the bottom side, the top ends are all provided with first threaded holes, and the second MEMS accelerometer chip plate 3 is fixed on the top ends of the four first screw connecting columns through four second screw connecting columns.

[0060] The bottom surface is provided with mounting tables at four outer corners, and the four corners of the table body 6 are provided with mounting notches corresponding to the mounting tables to form mounting channels.

[0061] Meanwhile, the application further provides a navigation information processing method based on the fiber-optic gyroscope and the MEMS accelerometer, which comprises the following steps:

[0062] Step 1: preparing a navigation device based on the fiber-optic gyroscope and the MEMS accelerometer as described above;

[0063] Step 2: the light source 11 emits light signals, the light signals pass through three fiber-optic ring modules and three photoelectric transducers to generate electrical signals containing three-axis angular velocity information, and the photoelectric transducers transmit the electrical signals containing the three-axis angular velocity information to the digital demodulation circuit board 2;

[0064] Step 3: while executing step 2, the temperature sensor collects the internal temperature of the table body 6 and transmits electrical signals containing temperature information to the digital demodulation circuit board 2;

[0065] Step 4: while executing step 2, the first MEMS accelerometer chip plate 15 and the second MEMS accelerometer chip plate 3 generate electrical signals containing three-axis acceleration information, process the electrical signals containing the three-axis acceleration information to obtain processed three-axis acceleration information, and transmit the processed three-axis acceleration information to the digital demodulation circuit board 2;

[0066] Step 5: the digital demodulation circuit board 2 corrects the three-axis angular velocity information obtained in step 2 according to the temperature information obtained in step 3 and the preset correction coefficients corresponding to different temperature information to obtain corrected three-axis angular velocity information, and the specific steps are as follows:

[0067] Step 5.1, the digital demodulation circuit board 2 obtains the temperature information collected by the temperature sensor;

[0068] Step 5.2, the digital demodulation circuit board 2 compares the temperature information obtained in step 5.1 with the temperature range corresponding to the pre-set correction coefficient, to obtain the correction coefficient to be selected for the obtained temperature information.

[0069] Step 5.3, according to the correction coefficient obtained in step 5.2, the three-axis angular velocity information obtained in step 2 is corrected to obtain the corrected three-axis angular velocity information.

[0070] Step 6, the digital demodulation circuit board 2 outputs the corrected three-axis angular velocity information and the processed three-axis acceleration information as navigation information to the external control end, and completes the navigation information processing.

[0071] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0072] In the description of the present application, it should be noted that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0073] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A navigation device based on fiber-optic gyroscope and MEMS accelerometer, comprising a three-axis fiber-optic gyroscope and a three-axis MEMS accelerometer, the three-axis fiber-optic gyroscope comprising three fiber-optic ring modules, three photoelectric converters, one light source (11) and one light source driving circuit board (10), wherein, The light source driving circuit board (10) is connected with the light source (11) and is used for driving the light source (11) to provide optical signals for three fiber ring modules; the three-axis MEMS accelerometer comprises a first MEMS accelerometer chip board (15) and a second MEMS accelerometer chip board (3) connected with the first MEMS accelerometer chip board (15) through a flexible wire, two MEMS accelerometers are integrated on the first MEMS accelerometer chip board (15), and one MEMS accelerometer is arranged on the second MEMS accelerometer chip board (3); characterized in that: The base (6) of soft magnetic alloy material, the digital demodulation circuit board (2), the temperature sensor and the cover plate of soft magnetic alloy material are further included. The base (6) has a cuboid frame structure and six mounting surfaces, and has an optical source mounting position and a temperature sensor mounting position in the interior. Three of the fiber ring modules are arranged on three mounting surfaces of the base (6) in orthogonal distribution along an inertial coordinate system, and one of the three photoelectric converters shares one mounting surface with one of the three fiber ring modules. The optical source mounting surface is provided with heat-conducting silicone grease, the optical source (11) is mounted on the optical source mounting surface through the heat-conducting silicone grease, and is tightly attached to the optical source mounting surface. The first MEMS accelerometer chip board (15) and the second MEMS accelerometer chip board (3) are orthogonally mounted on any two of the remaining three mounting surfaces of the base (6) which are not provided with the fiber ring modules, and the remaining one mounting surface is used for mounting the remaining two photoelectric converters. The temperature sensor is mounted on the temperature sensor mounting position. The temperature sensor, the first MEMS accelerometer chip board (15), the second MEMS accelerometer chip board (3) and the three photoelectric converters are electrically connected with the digital demodulation circuit board (2). The cover plate is connected with the base (6) and is used for sealing the navigation device based on the fiber-optic gyroscope and the MEMS accelerometer.

2. The navigation device based on fiber optic gyroscope and MEMS accelerometer according to claim 1, characterized in that: The cover plate comprises six cover plates which are respectively matched in size with the six mounting surfaces of the base (6).

3. The navigation device based on fiber optic gyroscope and MEMS accelerometer of claim 1, wherein: The optical source (11) is fixed at a middle position of the base (6), and the light source driving circuit board (10) is fixedly mounted at a position close to the optical source (11) in the base (6).

4. The navigation device based on fiber optic gyroscope and MEMS accelerometer of claim 3, wherein: The mounting surface of the base (6) connected with an external device is defined as a bottom surface, and an opposite surface thereof is defined as a top surface, one of the fiber ring modules is mounted on the bottom surface, and the second MEMS accelerometer chip board (3) is mounted on the top surface.

5. The navigation device based on fiber optic gyroscope and MEMS accelerometer of claim 4, wherein: The second MEMS accelerometer chip board (3) is arranged above the light source driving circuit board (10) through four first screw connecting columns, the bottom ends of the four first screw connecting columns are fixedly connected with the support positions arranged on the bottom side, the top ends of the four first screw connecting columns are provided with first screw holes, and the second MEMS accelerometer chip board (3) is fixed on the top ends of the four first screw connecting columns through four second screw connecting columns.

6. The navigation device based on fiber optic gyroscope and MEMS accelerometer of claim 5, wherein: The four outer corners of the bottom surface are provided with mounting tables, and the four corners of the table body (6) are provided with mounting notches corresponding to the mounting tables to form mounting channels.

7. The navigation device based on fiber optic gyroscope and MEMS accelerometer of claim 1, wherein: The table body (6) and the cover plate are both made of 1J79 soft magnetic alloy material.

8. The navigation device based on fiber optic gyroscope and MEMS accelerometer of claim 1, wherein: The surface roughness of the light source mounting surface and the mounting surface corresponding to the light source (11) is 0.

8.

9. A navigation information processing method based on a fiber-optic gyroscope and a MEMS accelerometer, characterized by, The method comprises the following steps: Step 1, preparing a navigation device based on the optical fiber gyroscope and the MEMS accelerometer according to claim 1; Step 2, the light source (11) emits light signals, the light signals pass through three optical fiber ring modules and three photoelectric transducers, and then generate electrical signals containing three-axis angular velocity information, and the photoelectric transducers transmit the electrical signals containing three-axis angular velocity information to the digital demodulation circuit board (2); Step 3, while step 2 is being performed, the temperature sensor collects the internal temperature of the table body (6) and transmits electrical signals containing temperature information to the digital demodulation circuit board (2); Step 4, while step 2 is being performed, the first MEMS accelerometer chip board (15) and the second MEMS accelerometer chip board (3) generate electrical signals containing three-axis acceleration information, process the electrical signals containing three-axis acceleration information, obtain processed three-axis acceleration information, and transmit the processed three-axis acceleration information to the digital demodulation circuit board (2); Step 5, the digital demodulation circuit board (2) corrects the three-axis angular velocity information obtained in step 2 according to the temperature information obtained in step 3 and the preset correction coefficient corresponding to different temperature information, and obtains corrected three-axis angular velocity information; Step 6, the digital demodulation circuit board (2) outputs the corrected three-axis angular velocity information and the processed three-axis acceleration information as navigation information to an external control end, and completes navigation information processing.

10. The navigation information processing method based on a fiber-optic gyroscope and a MEMS accelerometer according to claim 9, characterized by, Step 5 specifically comprises the following steps: Step 5.1, the digital demodulation circuit board (2) obtains the temperature information collected by the temperature sensor; Step 5.2, the digital demodulation circuit board (2) compares the temperature information obtained in step 5.1 with the temperature range corresponding to the preset correction coefficient, and obtains the correction coefficient to be selected for the obtained temperature information; Step 5.3, the three-axis angular velocity information obtained in step 2 is corrected according to the correction coefficient obtained in step 5.2, and corrected three-axis angular velocity information is obtained.

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