A fiber optic gyroscope

Abstract

The present invention proposes a fiber optic gyroscope, which relates to the field of gyroscopes. The device comprises a housing, a light source mounted within the housing, a first coupler, and three groups of fiber optic gyroscopes. Light emitted by the light source is divided into three beams by the first coupler and enters the three groups of fiber optic gyroscopes respectively. Each group of fiber optic gyroscopes comprises a second coupler, a Y-waveguide, an optical fiber ring, a photodetector, and a signal processing circuit, which are connected in sequence. The device utilizes integrated sampling design technology in fiber optic inertial navigation, whereby a single light source drives three fiber optic gyroscopes. This effectively solves the problems of light source stability and parameter consistency, and overcomes the cross-interference resistance of three-axis multiplexed optical paths. Key technologies include miniaturized integration technology and rapid startup of fiber optic gyroscopes. This reduces costs, reduces volume, shortens system startup time, improves system reliability, and provides vibration and shock resistance.

Description

Technical Field

[0001] The present invention relates to the field of gyroscopes, and in particular to a fiber optic gyroscope. Background Art

[0002] Traditional inertial gyroscopes are primarily mechanical. These gyroscopes have high requirements for process engineering and complex structures, and their accuracy is subject to numerous limitations. Since the 1970s, the development of modern gyroscopes has entered a new era. Modern fiber-optic gyroscopes, capable of accurately determining the position of moving objects, are widely used in modern aviation, navigation, aerospace, and defense industries as inertial navigation instruments. Their development holds strategic importance for a country's industry, defense, and other high-tech developments.

[0003] The implementation of the fiber optic gyroscope is mainly based on the Segnik theory: when a light beam travels in a circular channel, if the circular channel itself has a rotational speed, then the time required for the light to travel along the direction of the channel's rotation is longer than the time required to travel along the opposite direction of the channel. In other words, when the optical loop rotates, in different directions of travel, the optical path of the optical loop will change relative to the optical path when the loop is stationary. By using this change in optical path and detecting the phase difference or interference fringes between the two optical paths, the angular velocity of the optical path rotation can be measured.

[0004] However, in actual applications, the light source of the fiber optic gyroscope is easily interfered with, resulting in reduced navigation signal accuracy. Summary of the Invention

[0005] In order to overcome the above problems or at least partially solve the above problems, an embodiment of the present invention provides a fiber optic gyroscope to improve the accuracy of navigation signals.

[0006] The embodiment of the present invention is achieved as follows:

[0007] The object of the present invention is to provide a fiber optic gyroscope, comprising: a housing, a light source installed in the housing, a first coupler, and three groups of fiber optic gyroscopes;

[0008] The light emitted by the light source is divided into three beams after passing through the first coupler and enters three groups of fiber optic gyroscopes respectively;

[0009] Each set of fiber optic gyroscopes includes a second coupler, a Y waveguide, a fiber optic ring, a photodetector, and a signal processing circuit connected in sequence;

[0010] The second coupler in each fiber optic gyroscope splits a beam of light sent from the first coupler into two. One of the beams enters the Y-waveguide. After internal adjustment in the Y-waveguide, the two beams of linearly polarized light that meet coherence conditions and have a high degree of polarization are output. The two beams of linearly polarized light propagate towards each other in the fiber ring while sensing the external angular velocity. The photodetector detects changes in the intensity of the interference signal, converts the optical signal into an electrical signal, and then inputs it into a signal processing circuit for processing to generate a modulated voltage signal to adjust the Y-waveguide, causing the Y-waveguide to produce a feedback phase shift equal in magnitude and opposite in direction to the external Sagnac phase shift.

[0011] In some embodiments of the present invention, the shell includes a cover body and a bottom cover, the cover body and the bottom cover are detachably connected, and first fixing holes are symmetrically provided on the left and right sides of the bottom cover. The fixing holes pass through the bottom cover from top to bottom, and the fixing holes are located outside the cover body.

[0012] In some embodiments of the present invention, the bottom cover has symmetrically provided openings on the left and right sides of the lower bottom surface.

[0013] In some embodiments of the present invention, a side wall of the cover body is provided with an installation opening for installing a connector.

[0014] In some embodiments of the present invention, the lower part of the cover body is provided with a thickened portion inclined outward, the lower bottom surface of the thickened portion is provided with multiple screw holes, and the bottom cover is provided with multiple corresponding second fixing holes, and the screw holes correspond one-to-one to the second fixing holes.

[0015] In some embodiments of the present invention, the signal processing circuit includes an A / D circuit, a logic circuit, and a D / A circuit. The A / D circuit receives the electrical signal from the photodetector and converts the electrical signal into a digital signal and sends it to the logic circuit for processing. The D / A circuit outputs a modulated voltage signal.

[0016] Some embodiments of the present invention further include a transceiver and a GPS module connected to each other.

[0017] In some embodiments of the present invention, the transceiver includes an ADM2587 chip, 0.01uF, 10uF and two 0.1uF capacitors are connected between the input ends of the two VCC pins and the GND1 pin, a 0.1uF capacitor and a 0.01uF capacitor are connected between the Visoin pin and the GND2 pin, a 0.1uF capacitor and a 1.0uF capacitor are connected between the Visout pin and the GND2 pin, the RXD pin is used to send signals to the GPS module, the Visoin pin is connected to the Visout pin, the A pin and the Y pin are connected as a half-duplex A signal line, the B pin and the Z pin are connected as a half-duplex B signal line, the Visoin pin is connected to the A pin via a resistor R37, the GND2 pin is also connected to the voltage stabilizing circuit U20, the two pins of the voltage stabilizing circuit U20 are respectively connected to the A pin and the B pin, the A pin and the B pin are respectively connected to the connector after passing through a fuse, and a resistor R38 is connected between the B pin and the GND2 pin.

[0018] In some embodiments of the present invention, the GPS module adopts a GR-87 chip, the VCC pin of the GR-87 chip is grounded after passing through capacitor C92, the VCC pin is also connected to pin 1 of the connector, pin 1 of the connector is connected to the D pole of the field effect transistor Q1, resistor R32 is connected between the S pole and the G pole of the field effect transistor Q1, the G pole of the field effect transistor Q1 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is connected to the base after passing through resistors R34 and R33, the common end of resistors R34 and R33 is connected to input terminal 2 of the AND gate U24A, the TX_A pin is connected to input terminal 1 of the AND gate U24A, the RXD pin of the ADM2587 chip is connected to input terminal 4 of the AND gate U24B, the output terminals of the AND gate U24A and the AND gate U24B are respectively connected to the input terminals of the OR gate U25A, and the output terminal of the OR gate U25A is connected to the RX_A pin of the GR-87 chip.

[0019] In some embodiments of the present invention, the AND gates U24A and U24B are of type 74HC08, and the OR gate U25A is of type 74HC32.

[0020] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0021] An embodiment of the present invention provides a fiber optic gyroscope to improve the accuracy of navigation signals.

[0022] The embodiment of the present invention is achieved as follows:

[0023] The present invention aims to provide a fiber optic gyroscope, comprising: a housing, a light source mounted within the housing, a first coupler, and three groups of fiber optic gyroscopes. The three groups of fiber optic gyroscopes have the same structure, each including a second coupler, a Y-waveguide, an optical fiber ring, a photodetector, and a signal processing circuit. Light emitted by the light source is divided into three beams by the first coupler and enters the three groups of fiber optic gyroscopes. The integrated sampling design technology in the fiber optic inertial navigation system, whereby a single light source drives the three fiber optic gyroscopes, effectively solves the problems of light source stability and parameter consistency, and overcomes the cross-interference resistance of the three-axis multiplexed optical path. Key technologies include miniaturized integration technology and rapid startup of the fiber optic gyroscopes. This reduces costs, reduces volume, shortens system startup time, improves system reliability, and provides resistance to vibration and shock.

[0024] Specifically, the second coupler in each fiber optic gyroscope (FOG) splits the light beam transmitted from the first coupler into two. One of the light beams enters a Y-waveguide. After internal regulation within the Y-waveguide, the two linearly polarized beams are output, meeting coherence conditions and exhibiting high polarization degrees. These two linearly polarized beams propagate in opposite directions within the fiber loop, simultaneously sensing external angular velocity. The photodetector detects changes in the intensity of the interference signal and converts the optical signal into an electrical signal, which is then fed into a signal processing circuit for processing. A modulated voltage signal is generated to modulate the Y-waveguide, causing it to produce a feedback phase shift equal in magnitude and opposite in direction to the external Sagnac phase shift. FOG compasses utilize strapdown inertial navigation technology. The basic operating principle is based on Newtonian mechanics. The acceleration of the carrier in an inertial reference frame is measured, integrated over time, and then transformed into a navigation coordinate system. Velocity, yaw angle, and position information in the navigation coordinate system are obtained. Practical systems typically use an inertial navigation system as the primary navigation system, while other navigation systems, such as astronomical navigation and GPS, are used as auxiliary navigation systems. Kalman filtering techniques are applied, and the auxiliary information is used as an observation. The state variables of the combined system are used to obtain the most reliable and high-precision navigation signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a structural schematic diagram of an embodiment of a fiber optic gyroscope of the present invention;

[0027] Figure 2 This is a schematic structural diagram of a fiber optic gyroscope in one embodiment of the present invention;

[0028] Figure 3 This is a structural schematic diagram of a housing in one embodiment of a fiber optic gyroscope of the present invention;

[0029] Figure 4 This is a structural schematic diagram of a housing in one embodiment of a fiber optic gyroscope of the present invention;

[0030] Figure 5 This is a circuit schematic diagram of a transceiver in one embodiment of a fiber optic gyroscope of the present invention;

[0031] Figure 6 This is a circuit schematic diagram of a GPS module in one embodiment of a fiber optic gyroscope of the present invention.

[0032] Icons: 1. Shell; 11. Cover; 111. Mounting port; 112. Thickened portion; 113. Screw hole; 12. Bottom cover; 121. First fixing hole; 122. Extension port; 123. Second fixing hole; 2. Light source; 3. First coupler; 4. Fiber optic gyroscope; 41. Second coupler; 42. Y-waveguide; 43. Fiber optic ring; 44. Photodetector; 45. Signal processing circuit; 451. A / D circuit; 452. Logic circuit; 453. D / A circuit. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0037] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0038] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] Example

[0040] Please refer to Figure 1-2 An embodiment of the present invention provides a fiber optic gyroscope 4, comprising: a housing 1, a light source 2 installed in the housing 1, a first coupler 3, and three groups of fiber optic gyroscopes 4.

[0041] The light emitted by the light source 2 passes through the first coupler 3 and is split into three beams, each entering three sets of fiber optic gyroscopes 4. The integrated sampling design technology in fiber optic inertial navigation, where a single light source 2 drives three fiber optic gyroscopes 4, effectively solves the stability and parameter consistency issues of the light source 2 and overcomes the cross-interference resistance of the three-axis multiplexed optical path. Key technologies include miniaturized integration and rapid startup of the fiber optic gyroscopes 4. This reduces costs, reduces size, shortens system startup time, improves system reliability, and provides resistance to vibration and shock.

[0042] Specifically, each set of fiber optic gyroscopes 4 includes a second coupler 41, a Y-waveguide 42, a fiber ring 43, a photodetector 44, and a signal processing circuit 45 connected in sequence. The second coupler 41 in each set of fiber optic gyroscopes 4 splits a beam of light sent from the first coupler 3 into two, one of which enters the Y-waveguide 42. After internal adjustment by the Y-waveguide 42, the two beams of linearly polarized light that meet the coherence condition and have a high degree of polarization are output. The two beams of linearly polarized light propagate towards each other in the fiber ring 43 while sensing the external angular velocity. The photodetector 44 detects the change in the intensity of the interference signal, converts the optical signal into an electrical signal, and then inputs it into the signal processing circuit 45 for processing to generate a modulation voltage signal to adjust the Y-waveguide 42, so that the Y-waveguide 42 generates a feedback phase shift equal in magnitude and opposite in direction to the external Sagnac phase shift, thereby forming a digital closed-loop operating mode, so that the fiber optic gyroscope 4 always operates near zero phase.

[0043] The fiber optic gyro compass utilizes strapdown inertial navigation technology. Its basic operating principle is based on Newton's laws of mechanics. It measures the acceleration of the carrier in an inertial reference frame, integrates it over time, and then transforms it into a navigation coordinate system. This information, including velocity, yaw angle, and position, is obtained in the navigation coordinate system. In practical systems, an inertial navigation system is typically used as the primary navigation system, while other navigation systems, such as astronomical navigation and GPS, are used as auxiliary navigation systems. Kalman filtering is applied to this auxiliary information, using it as an observation variable. The state variables of the combined system are then analyzed to generate a reliable, high-precision navigation signal.

[0044] Please refer to Figure 3-4 In some embodiments of the present invention, the housing 1 includes a cover 11 and a bottom cover 12. The cover 11 and the bottom cover 12 are detachably connected. Figure 3 In this embodiment, the cover body 11 and the bottom cover 12 are connected by fasteners. The bottom cover 12 is symmetrically provided with first fixing holes 121 on both sides. The fixing holes penetrate the bottom cover 12 from top to bottom and are located outside the cover body 11. To fix the housing 1, when in use, the cover body 11 and the bottom cover 12 are first fixed by fasteners, and then the housing 1 is fixed to the desired position through the fixing holes according to actual needs.

[0045] In some embodiments of the present invention, the bottom cover 12 has symmetrically disposed insertion openings 122 on the left and right sides of its lower surface. This facilitates disassembly of the housing 1. The insertion openings 122 provide a force point for the user during disassembly, allowing the user to insert both hands into the insertion openings 122 on the left and right sides of the bottom cover 12. Furthermore, this facilitates transport.

[0046] Furthermore, a side wall of the cover body 11 is provided with an installation opening 111 for installing a connector.

[0047] Please refer to Figure 4 In some embodiments of the present invention, the lower portion of the cover body 11 is provided with an outwardly inclined thickened portion 112. The thickened portion 112 is used to provide screw holes 113 for fixing the bottom cover 12. The bottom surface of the thickened portion 112 is provided with multiple screw holes 113, and the bottom cover 12 is provided with multiple corresponding second fixing holes 123. The screw holes 113 correspond one-to-one with the second fixing holes 123. This configuration is intended to reinforce the bottom cover 12.

[0048] Exemplarily, the signal processing circuit 45 includes an A / D circuit 451, a logic circuit 452 and a D / A circuit 453. The A / D circuit 451 receives the electrical signal from the photodetector 44 and converts the electrical signal into a digital signal and sends it to the logic circuit 452 for processing. The D / A circuit 453 outputs a modulated voltage signal.

[0049] Furthermore, it also includes a transceiver and a GPS module connected to each other.

[0050] Please refer to Figure 5 In some embodiments of the present invention, the transceiver includes an ADM2587 chip, 0.01uF, 10uF and two 0.1uF capacitors are connected between the input ends of the two VCC pins and the GND1 pin, a 0.1uF capacitor and a 0.01uF capacitor are connected between the Visoin pin and the GND2 pin, a 0.1uF capacitor and a 1.0uF capacitor are connected between the Visout pin and the GND2 pin, the RXD pin is used to send signals to the GPS module, the Visoin pin is connected to the Visout pin, the A pin and the Y pin are connected as a half-duplex A signal line, the B pin and the Z pin are connected as a half-duplex B signal line, the Visoin pin is connected to the A pin via a resistor R37, the GND2 pin is also connected to the voltage stabilizing circuit U20, the two pins of the voltage stabilizing circuit U20 are respectively connected to the A pin and the B pin, the A pin and the B pin are respectively connected to the connector after passing through a fuse, and a resistor R38 is connected between the B pin and the GND2 pin. The A, B, Y, and Z pins have ±15KV ESD protection and 25KV / us common-mode suppression capabilities, which can provide most of the protection functions for the chip pins. In harsh application environments, devices such as TVS tubes can be added to the bus to enhance the chip's protection against large surge currents and voltages.

[0051] Please refer to Figure 6In some embodiments of the present invention, the GPS module uses a GR-87 chip. The VCC pin of the GR-87 chip is grounded via a capacitor C92. The VCC pin is also connected to pin 1 of a connector. Pin 1 of the connector is connected to the D electrode of a field-effect transistor Q1. A resistor R32 is connected between the S and G electrodes of the field-effect transistor Q1. The G electrode of the field-effect transistor Q1 is connected to the collector of a transistor Q2. The emitter of the transistor Q2 is connected to the base via resistors R34 and R33. The common end of the resistors R34 and R33 is connected to input terminal 2 of an AND gate U24A. The TX_A pin is connected to input terminal 1 of the AND gate U24A. The RXD pin of the ADM2587 chip is connected to input terminal 4 of an AND gate U24B. The outputs of the AND gates U24A and U24B are respectively connected to the inputs of an OR gate U25A. The output of the OR gate U25A is connected to the RX_A pin of the GR-87 chip. It has the ability to quickly locate and track 20 satellites, has GPS wireless connection, and has reserved external interface. It comes with the US GPS, China's Beidou positioning, and Russia's GLONASS, so it is called three-mode, with stable signal and internal rotation conversion.

[0052] Exemplarily, the AND gate U24A and the AND gate U24B are of type 74HC08, and the OR gate U25A is of type 74HC32.

[0053] In summary, an embodiment of the present invention provides a fiber optic gyroscope (4), comprising: a housing (1), a light source (2) mounted within the housing (1), a first coupler (3), and three groups of fiber optic gyroscopes (4). The three groups of fiber optic gyroscopes (4) have the same structure, each including a second coupler (41), a Y-waveguide (42), a fiber ring (43), a photodetector (44), and a signal processing circuit (45). The light emitted by the light source (2) is divided into three beams by the first coupler (3), and enters the three groups of fiber optic gyroscopes (4). The integrated sampling design technology in the fiber optic inertial navigation system (FIIN), whereby a single light source (2) drives the three fiber optic gyroscopes (4), effectively solves the stability and parameter consistency issues of the light source (2), and overcomes the cross-interference resistance of the three-axis multiplexed optical path. Key technologies include miniaturized integration technology and rapid startup of the fiber optic gyroscopes (4). This reduces costs, reduces volume, shortens system startup time, improves system reliability, and provides resistance to vibration and shock.

[0054] Specifically, the second coupler 41 in each fiber optic gyroscope 4 splits the light beam transmitted from the first coupler 3 into two. One of the light beams enters the Y-waveguide 42. After internal regulation within the Y-waveguide 42, the two linearly polarized beams are output, meeting the coherence condition and exhibiting high polarization. These two linearly polarized beams propagate in opposite directions within the fiber ring 43, simultaneously sensing the external angular velocity. The photodetector 44 detects changes in the intensity of the interference signal and converts the optical signal into an electrical signal, which is then input into the signal processing circuit 45 for processing. The resulting modulated voltage signal modulates the Y-waveguide 42, causing it to produce a feedback phase shift equal in magnitude and opposite in direction to the external Sagnac phase shift. The fiber optic gyroscope 4 compass utilizes strapdown inertial navigation technology. Its basic operating principle is based on Newtonian mechanics. By measuring the acceleration of the carrier in an inertial reference frame, the acceleration is integrated over time, and then transformed into a navigation coordinate system. Velocity, yaw angle, and position information in the navigation coordinate system are obtained. Practical systems typically use an inertial navigation system as the primary navigation system. Other navigation systems, such as astronomical navigation and GPS, are used as auxiliary navigation systems. Kalman filtering technology is applied, and the auxiliary information is used as observations to analyze the state variables of the combined system to obtain the most reliable and high-precision navigation signal.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0056] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A fiber optic gyroscope, characterized in that: include: A housing and a light source, a first coupler and three sets of fiber optic gyroscopes installed in the housing; The light emitted by the light source is divided into three beams after passing through the first coupler and enters three groups of fiber optic gyroscopes respectively; Each set of fiber optic gyroscopes includes a second coupler, a Y waveguide, a fiber optic ring, a photodetector, and a signal processing circuit connected in sequence; The second coupler in each fiber optic gyroscope group splits a beam of light sent from the first coupler into two, one of which enters the Y-waveguide. After internal adjustment in the Y-waveguide, the two beams of linearly polarized light that meet the coherence condition and have a high degree of polarization are output. The two beams of linearly polarized light propagate in opposite directions in the fiber ring while sensing the external angular velocity. The photodetector detects the change in the intensity of the interference signal, converts the optical signal into an electrical signal, and inputs it into the signal processing circuit for processing to generate a modulation voltage signal to adjust the Y-waveguide, causing the Y-waveguide to produce a feedback phase shift equal in magnitude and opposite in direction to the external Sagnac phase shift. It also includes a transceiver and GPS module that are connected to each other; The transceiver includes an ADM2587 chip, 0.01uF, 10uF and two 0.1uF capacitors are connected between the input ends of the two VCC pins and the GND1 pin, a 0.1uF capacitor and a 0.01uF capacitor are connected between the Visoin pin and the GND2 pin, a 0.1uF capacitor and a 1.0uF capacitor are connected between the Visout and GND2 pins, the RXD pin is used to send signals to the GPS module, the Visoin pin is connected to the Visout pin, the A pin and the Y pin are connected as the half-duplex A signal line, the B pin and the Z pin are connected as the half-duplex B signal line, the Visoin pin is connected to the A pin via a resistor R37, the GND2 pin is also connected to the voltage stabilizing circuit U20, the two pins of the voltage stabilizing circuit U20 are respectively connected to the A pin and the B pin, the A pin and the B pin are respectively connected to the connector after passing through a fuse, and the B pin is connected to the GND2 pin. Resistor R38; The GPS module adopts the GR-87 chip, the VCC pin of the GR-87 chip is grounded after passing through the capacitor C92, the VCC pin is also connected to the No. 1 pin of the connector, the No. 1 pin of the connector is connected to the D pole of the field effect transistor Q1, the S pole and the G pole of the field effect transistor Q1 are connected between the resistor R32, the G pole of the field effect transistor Q1 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is connected to the base after passing through the resistors R34 and R33, the common end of the resistors R34 and R33 is connected to the No. 2 input end of the AND gate U24A, the TX_A pin is connected to the No. 1 input end of the AND gate U24A, the RXD pin of the ADM2587 chip is connected to the No. 4 input end of the AND gate U24B, the output ends of the AND gate U24A and the AND gate U24B are respectively connected to the input end of the OR gate U25A, and the output end of the OR gate U25A is connected to the RX_A pin of the GR-87 chip; The shell includes a cover body and a bottom cover, the cover body and the bottom cover are detachably connected, and first fixing holes are symmetrically provided on the left and right sides of the bottom cover. The fixing holes pass through the bottom cover from top to bottom and are located outside the cover body.

2. The fiber optic gyroscope according to claim 1, wherein: The bottom surface of the bottom cover is symmetrically provided with insertion openings on both sides.

3. The fiber optic gyroscope according to claim 1, wherein: A side wall of the cover body is provided with an installation opening for installing a connector.

4. The fiber optic gyroscope according to claim 1, wherein: The lower part of the cover body is provided with a thickened portion inclined outward, the lower bottom surface of the thickened portion is provided with a plurality of screw holes, and the bottom cover is provided with a plurality of matching second fixing holes, and the screw holes correspond to the second fixing holes one by one.

5. The fiber optic gyroscope according to claim 1, wherein: The signal processing circuit includes an A / D circuit, a logic circuit and a D / A circuit. The A / D circuit receives the electrical signal from the photodetector and converts the electrical signal into a digital signal and sends it to the logic circuit for processing. The D / A circuit outputs a modulated voltage signal.

6. The fiber optic gyroscope according to claim 1, characterized in that: The AND gate U24A and the AND gate U24B are of type 74HC08, and the OR gate U25A is of type 74HC32.

Images