A small-volume fiber optic gyroscope north finder

Abstract

This utility model relates to a small-volume fiber optic gyroscope north-finding instrument, comprising a housing, inside which a fiber optic gyroscope and an accelerometer are installed. The housing includes an upper cylinder and a lower cylinder, with corresponding connecting ears on the top of the upper cylinder and the bottom of the lower cylinder. The lower cylinder has mounting holes on its wall for installing connectors. An electric turntable is also installed inside the housing. The body of the electric turntable is fixedly mounted on the bottom wall of the lower cylinder by several support rods. A mounting bracket is mounted on the turntable, including a fixed plate on the surface of the turntable and a U-shaped fork arm perpendicular to the fixed plate. The fixed plate is fixedly mounted on the surface of the turntable by screws. The bottom end of the U-shaped fork arm is fixedly connected to the fixed plate, and the top of the U-shaped fork arm is fixedly connected to the base plate of the fiber optic gyroscope by bolts. The accelerometer is also fixedly mounted on the U-shaped fork arm. This small-volume fiber optic gyroscope north-finding instrument is compact, lightweight, and easy to assemble and maintain.

Description

Technical Field

[0001] This utility model relates to a north-finding instrument, and more particularly to a small-volume fiber optic gyroscope north-finding instrument. Background Technology

[0002] A north-finding instrument is a guiding device used to confirm true north, widely used in surveying and exploration. Existing north-finding instruments primarily rely on gyroscopes and accelerometers to confirm true north. The gyroscope detects the Earth's rotational angular velocity, and the accelerometer measures the gravity vector, thus compensating for errors caused by the tilt of the carrier. The host computer system uses the Earth's rotational angular velocity obtained from the gyroscope and the gravity data obtained from the accelerometer, along with a specific algorithm, to calculate the true north. However, existing north-finding instruments have an imperfect structural design, resulting in a large overall size and weight, and making assembly and maintenance relatively difficult. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a small-volume fiber optic gyroscope north finder that is compact in structure, lightweight, and easy to assemble and maintain.

[0004] The present invention relates to a small-volume fiber optic gyroscope north finder, comprising a housing, wherein a fiber optic gyroscope and an accelerometer are disposed inside the housing. The housing comprises an upper cylinder and a lower cylinder, both of which are cylindrical structures with one end open and the other end closed. Connecting ears are correspondingly provided at the top of the upper cylinder and the bottom of the lower cylinder, and connecting holes through the connecting ears are provided on the surface of the connecting ears. Mounting holes for installing connectors are provided on the cylinder wall of the lower cylinder.

[0005] An electric turntable is also installed inside the housing. The body of the electric turntable is fixedly mounted on the bottom wall of the lower cylinder by several support rods. A mounting bracket is installed on the turntable of the electric turntable. The mounting bracket includes a fixed plate set on the surface of the turntable and a U-shaped fork arm perpendicular to the fixed plate. The fixed plate is fixedly mounted on the surface of the turntable by screws. The bottom end of the U-shaped fork arm is fixedly connected to the fixed plate. The top of the U-shaped fork arm is fixedly connected to the base plate of the fiber optic gyroscope by bolts. The accelerometer is also fixedly mounted on the U-shaped fork arm.

[0006] The advantages of this small-volume fiber optic gyroscope north-finding instrument lie in its housing, which comprises an upper cylinder and a lower cylinder, fixed together by connecting lugs to form a sealed cylindrical body, simplifying assembly and disassembly. Simultaneously, an electric turntable inside the housing is fixed to the bottom wall of the lower cylinder by several support rods. A fiber optic gyroscope and accelerometer are mounted on the turntable via a fixing plate and U-shaped fork arm, driving the gyroscope and accelerometer to rotate. This allows for the measurement of angular velocity and acceleration at four positions, thereby calculating true north. Compared to existing north-finding instruments, this small-volume fiber optic gyroscope north-finding instrument uses a high-precision fiber optic gyroscope to obtain the Earth's rotation angular rate and a high-precision accelerometer to obtain the gravitational acceleration component for tilt compensation. The high-precision electric turntable drives the gyroscope and accelerometer, and with the aid of specific signal processing circuits and algorithms, it can quickly determine the true north azimuth of the carrier.

[0007] Furthermore, in the present invention, the small-volume fiber optic gyroscope north finder, the support rod includes a main rod body, a connecting rod is provided on the top surface of the main rod body, the connecting rod is fixedly installed in the positioning hole on the bottom surface of the electric turntable, and the bottom end of the main rod body is fixedly installed on the bottom wall of the lower cylinder.

[0008] The main rod, connecting rod, and positioning holes enable the positioning and fixation of the electric turntable.

[0009] Furthermore, in this utility model of a small-volume fiber optic gyroscope north finder, the left and right sides of the main body are respectively provided with planar grooves that run horizontally through the main body.

[0010] The flat groove on the side of the main rod body makes it easy for operators to fix the support rod to the bottom wall of the lower cylinder with bolts.

[0011] Furthermore, in this utility model of a small-volume fiber optic gyroscope north finder, the surface of the fixing plate is provided with a through hole penetrating the fixing plate.

[0012] The through holes on the surface of the fixing plate not only reduce the weight of the fixing plate, but also facilitate its connection with different models of turntables and motors.

[0013] Furthermore, in this utility model of a small-volume fiber optic gyroscope north finder, the bottom end of the lower cylinder is also provided with a fixing lug, and a fixing hole is opened in the middle of the fixing lug.

[0014] The fixed lugs make it easy for operators to install this small fiber optic gyroscope north finder on external devices.

[0015] Furthermore, in this utility model of a small-volume fiber optic gyroscope north finder, both the upper and lower cylinders are made of stainless steel.

[0016] The upper and lower cylinders, made of stainless steel, not only have rust-proof and corrosion-resistant properties, but are also lightweight, thereby further reducing the overall weight of the instrument and improving its portability.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following describes the embodiments of this utility model in detail. Attached Figure Description

[0018] Figure 1 This is a 3D diagram of a small-volume fiber optic gyroscope north-finding instrument.

[0019] Figure 2 This is a three-dimensional view of the upper cylinder.

[0020] Figure 3 This is a three-dimensional view of the lower cylinder.

[0021] Figure 4 This is a diagram of the internal structure of a small-volume fiber optic gyroscope north finder.

[0022] Figure 5 This is the front view of the support rod.

[0023] Figure 6 This is a 3D view of the support rod.

[0024] Figure 7 It is a 3D view of the mounting bracket.

[0025] Figure 8 This is a disassembled diagram of a small-volume fiber optic gyroscope north-finding instrument.

[0026] In the diagram, 1 is the housing, 2 is the fiber optic gyroscope, 3 is the upper cylinder, 4 is the lower cylinder, 5 is the connecting lug, 6 is the connecting hole, 7 is the mounting hole, 8 is the electric turntable, 9 is the support rod, 10 is the mounting bracket, 11 is the fixing plate, 12 is the U-shaped fork arm, 13 is the main rod, 14 is the connecting rod, 15 is the positioning hole, 16 is the flat groove, 17 is the through hole, 18 is the fixing lug, and 19 is the fixing hole. Detailed Implementation

[0027] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0028] Example 1: See Figures 1 to 8The small-volume fiber optic gyroscope north finder of this embodiment includes a housing 1, in which a fiber optic gyroscope 2 and an accelerometer are disposed. The housing includes an upper cylinder 3 and a lower cylinder 4. Both the upper cylinder and the lower cylinder are cylindrical structures with one end open and the other end closed. Connecting ears 5 are correspondingly provided at the top of the upper cylinder and the bottom of the lower cylinder. Connecting holes 6 are provided on the surface of the connecting ears. Mounting holes 7 for installing connectors are provided on the cylinder wall of the lower cylinder.

[0029] An electric turntable 8 is also provided inside the housing. The body of the electric turntable is fixedly mounted on the bottom wall of the lower cylinder by several support rods 9. A mounting bracket 10 is provided on the turntable of the electric turntable. The mounting bracket includes a fixed plate 11 set on the surface of the turntable and a U-shaped fork arm 12 perpendicular to the fixed plate. The fixed plate is fixedly mounted on the surface of the turntable by screws. The bottom end of the U-shaped fork arm is fixedly connected to the fixed plate. The top of the U-shaped fork arm is fixedly connected to the base plate of the fiber optic gyroscope by bolts. The accelerometer is also fixedly mounted on the U-shaped fork arm.

[0030] The advantages of this small-volume fiber optic gyroscope north-finding instrument lie in its housing, which comprises an upper cylinder and a lower cylinder, fixed together by connecting lugs to form a sealed cylindrical body, simplifying assembly and disassembly. Simultaneously, an electric turntable inside the housing is fixed to the bottom wall of the lower cylinder by several support rods. A fiber optic gyroscope and accelerometer are mounted on the turntable via a fixing plate and U-shaped fork arm, driving the gyroscope and accelerometer to rotate. This allows for the measurement of angular velocity and acceleration at four positions, thereby calculating true north. Compared to existing north-finding instruments, this small-volume fiber optic gyroscope north-finding instrument uses a high-precision fiber optic gyroscope to obtain the Earth's rotation angular rate and a high-precision accelerometer to obtain the gravitational acceleration component for tilt compensation. The high-precision electric turntable drives the gyroscope and accelerometer, and with the aid of specific signal processing circuits and algorithms, it can quickly determine the true north azimuth of the carrier.

[0031] The connecting lugs are used to connect the upper and lower cylinders. They have a triangular cross-section with a connecting hole for mounting bolts in the middle. During installation, the operator aligns the connecting lugs on the upper and lower cylinders, passes the bolt through the connecting hole in the middle of the connecting lug, and then connects it with the nut, thereby achieving quick fixing of the upper and lower cylinders.

[0032] An electric turntable drives the mounting bracket and its mounted gyroscope and accelerometer to rotate, enabling rapid and precise north-finding. To improve measurement accuracy, a high-precision stepper motor can be used as the rotation drive. The control system precisely controls the turntable's rotation angle by outputting step signals to the stepper motor. During measurement, the control system samples data from the fiber optic gyroscope and accelerometer every 90 degrees of rotation. After sampling, the turntable continues to rotate until it completes one full rotation. Then, the control system processes the sampled data using a specific algorithm to obtain the true north direction.

[0033] The mounting bracket is used to mount fiber optic gyroscopes and accelerometers. It includes a mounting plate fixed to the turntable and a U-shaped fork arm fixedly connected to the mounting plate. The mounting plate has a through hole in the middle to accommodate turntables with different signal types. The U-shaped fork arm not only ensures stable mounting of the fiber optic gyroscope but also reduces its weight, thus lowering the overall weight of the instrument.

[0034] The support rods are used to fix the electric turntable inside the housing. In this embodiment, there are four support rods. The four support rods are evenly distributed below the electric turntable. Their top ends are fixed to the body of the electric turntable, and their bottom ends are fixed to the bottom arm of the lower cylinder.

[0035] Preferably, the support rod includes a main rod body 13, a connecting rod 14 is provided on the top surface of the main rod body, the connecting rod is fixedly installed in the positioning hole 15 on the bottom surface of the electric turntable, and the bottom end of the main rod body is fixedly installed on the bottom wall of the lower cylinder.

[0036] The main rod, connecting rod, and positioning holes enable the positioning and fixation of the electric turntable.

[0037] Specifically, the bottom surface of the electric turntable body has four positioning holes, and the connecting rods at the top of the four support rods are fixedly installed in the four positioning holes respectively. The connecting rods can be connected and fixed to the electric turntable body through interference fit, threaded fit, key connection, etc.

[0038] Preferably, the left and right sides of the main rod are provided with planar grooves 16 that run horizontally through the main rod.

[0039] The flat groove on the side of the main rod body makes it easy for operators to fix the support rod to the bottom wall of the lower cylinder with bolts.

[0040] Specifically, after placing the support rod in the predetermined position on the bottom wall of the lower cylinder, the operator inserts the bolt from below through the through hole on the bottom wall of the lower cylinder into the threaded hole on the bottom surface of the main rod, and then tightens the bolt onto the main rod, thereby firmly fixing the support rod to the bottom wall of the lower cylinder. During the tightening process, the operator can hold the flat groove by hand or use a wrench to grip the flat groove part of the main rod to prevent the main rod from rotating during the bolt connection process.

[0041] In addition, in order to reduce the impact of external shocks and vibrations on the fiber optic gyroscope and accelerometer, the support rod can be made of a material with certain shock-absorbing properties, such as rubber with a certain degree of elasticity, to reduce the impact of external shocks on the fiber optic gyroscope and accelerometer.

[0042] Preferably, the surface of the fixing plate is provided with a through hole 17 that penetrates the fixing plate.

[0043] The through holes on the surface of the fixing plate not only reduce the weight of the fixing plate, but also facilitate its connection with different models of turntables and motors.

[0044] Preferably, the bottom end of the lower cylinder is also provided with a fixing ear 18, and a fixing hole 19 is provided in the middle of the fixing ear.

[0045] The fixed lugs make it easy for operators to install this small fiber optic gyroscope north finder on external devices.

[0046] Preferably, both the upper and lower cylinders are made of stainless steel.

[0047] The upper and lower cylinders, made of stainless steel, not only have rust-proof and corrosion-resistant properties, but are also lightweight, thereby further reducing the overall weight of the instrument and improving its portability.

[0048] The above description is merely a preferred embodiment of this utility model, used to assist those skilled in the art in implementing the corresponding technical solutions, and is not intended to limit the scope of protection of this utility model. The scope of protection of this utility model is defined by the appended claims. It should be noted that, for those skilled in the art, several equivalent improvements and modifications can be made based on the technical solutions of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Furthermore, it should be understood that although this specification describes the embodiments as described above, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions of each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A small-volume fiber optic gyroscope north finder, comprising a housing (1), wherein a fiber optic gyroscope (2) and an accelerometer are disposed within the housing, characterized in that: The housing includes an upper cylinder (3) and a lower cylinder (4). Both the upper and lower cylinders are cylindrical structures with one end open and the other end closed. The top of the upper cylinder and the bottom of the lower cylinder are respectively provided with connecting ears (5). The surface of the connecting ears is provided with connecting holes (6) that pass through the connecting ears. The cylinder wall of the lower cylinder is provided with mounting holes (7) for installing connectors. An electric turntable (8) is also provided inside the housing. The body of the electric turntable is fixedly mounted on the bottom wall of the lower cylinder by several support rods (9). A mounting bracket (10) is provided on the turntable of the electric turntable. The mounting bracket includes a fixed plate (11) set on the surface of the turntable and a U-shaped fork arm (12) perpendicular to the fixed plate. The fixed plate is fixedly mounted on the surface of the turntable by screws. The bottom end of the U-shaped fork arm is fixedly connected to the fixed plate. The top of the U-shaped fork arm is fixedly connected to the base plate of the fiber optic gyroscope by bolts. The accelerometer is also fixedly mounted on the U-shaped fork arm.

2. The small-volume fiber optic gyroscope north finder according to claim 1, characterized in that: The support rod includes a main rod body (13), a connecting rod (14) is provided on the top surface of the main rod body, the connecting rod is fixedly installed in the positioning hole (15) on the bottom surface of the electric turntable, and the bottom end of the main rod body is fixedly installed on the bottom wall of the lower cylinder.

3. The small-volume fiber optic gyroscope north finder according to claim 2, characterized in that: The left and right sides of the main rod are respectively provided with planar grooves (16) that run horizontally through the main rod.

4. The small-volume fiber optic gyroscope north finder according to claim 1, characterized in that: The surface of the fixing plate is provided with a through hole (17) that penetrates the fixing plate.

5. The small-volume fiber optic gyroscope north finder according to claim 1, characterized in that: The bottom end of the lower cylinder is also provided with a fixing lug (18), and a fixing hole (19) is provided in the middle of the fixing lug.

6. The small-volume fiber optic gyroscope north finder according to claim 1, characterized in that: Both the upper and lower cylinders are made of stainless steel.

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