High-integration-level circuit for three-axis integrated laser gyroscope and laser gyroscope

Abstract

The utility model provides a high-integration circuit for a three-axis integrated laser gyroscope and the laser gyroscope. The circuit comprises a processing unit, the jitter feedback conditioning unit is connected with the input end of the processing unit; the jitter driving unit is connected with the output end of the processing unit; the photocurrent signal amplification unit is connected with the input end of the laser gyroscope test board; the light intensity signal amplification unit is connected with the input end of the processing unit; the stable control unit is connected with the output end of the processing unit; the laser gyroscope comprises a main body and further comprises a high-integration-level circuit for the three-axis integrated laser gyroscope, and the high-integration-level circuit for the three-axis integrated laser gyroscope is arranged in the main body; according to the high-integration circuit for the three-axis integrated laser gyroscope provided by the utility model, the circuit part of the laser gyroscope and the circuit part of the laser gyroscope are integrated on the same circuit board, so that the overall size can be further reduced; meanwhile, mutual interference among the units can be eliminated, and the overall control precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser gyroscopes, in particular to a highly integrated circuit for a three-axis integrated laser gyroscope and a laser gyroscope. Background Art

[0002] The laser gyroscope is a sensing device based on the Sagnac effect used to measure the angular motion of a carrier. It is one of the core components of an inertial navigation system. Compared with other types of gyroscopes, such as mechanical gyroscopes, three-float gyroscopes, electrostatic gyroscopes, and fiber optic gyroscopes, the laser gyroscope has the advantages of fast startup, high precision, large dynamic range, shock resistance, and high stability. It is currently the most widely used gyroscope.

[0003] Commonly used laser gyroscopes use single-axis laser gyroscopes, that is, a single-axis laser gyroscope can only measure the angular rate in one direction. Three single-axis laser gyroscopes need to be installed orthogonally to measure the angular rates in three directions to meet the needs of the inertial navigation system.

[0004] In the prior art, authorization publication number CN 218097784 U, titled "A New Space Three-Axis Laser Gyro Resonant Cavity," proposes a first, second, and third sensitive optical loops, each of which intersects perpendicularly in the non-gain region. This new design prevents interference between the three optical paths and allows for independent adjustment, effectively circumventing the technical difficulties of cross-correlation cavity tuning and cross-frequency stabilization in current space three-axis laser gyros. This design further improves the precision of the space three-axis laser gyro and reduces the difficulty of cavity tuning and frequency stabilization.

[0005] However, although the existing technology achieves simultaneous three-axis measurement, the overall size is relatively large due to structural limitations. In addition, in the three-axis integrated laser gyroscope, the circuit structure is one of the cores, which plays a vital role in the miniaturization and precision of the three-axis integrated laser gyroscope. Therefore, in order to better miniaturize and improve the precision of the three-axis integrated laser gyroscope, a highly integrated circuit for the three-axis integrated laser gyroscope is urgently needed. Utility Model Content

[0006] The purpose of the utility model is to provide a highly integrated circuit and a laser gyroscope for a three-axis integrated laser gyroscope, which can solve the above-mentioned technical problems;

[0007] The utility model provides a highly integrated circuit for a three-axis integrated laser gyroscope, which is characterized by comprising:

[0008] processing unit;

[0009] a jitter feedback conditioning unit for receiving a jitter wheel feedback signal, connected to an input terminal of the processing unit;

[0010] a jitter driving unit for receiving a driving signal output by the processing unit, connected to an output terminal of the processing unit;

[0011] A photocurrent signal amplifying unit for receiving a photocurrent signal, connected to an input terminal of the laser gyro test bench;

[0012] A light intensity signal amplifying unit for receiving the light intensity current signal, connected to the input end of the processing unit;

[0013] The stabilization control unit is used to receive the frequency stabilization control signal output by the processing unit and is connected to the output end of the processing unit.

[0014] As a further technical solution, the jitter feedback conditioning unit is connected to the first input terminal, the second input terminal and the third input terminal of the processing unit respectively.

[0015] As a further technical solution, the jitter feedback conditioning unit outputs a first feedback signal, a second feedback signal, and a third feedback signal respectively; and the first feedback signal, the second feedback signal, and the third feedback signal enter the processing unit through the first input terminal, the second input terminal, and the third input terminal respectively.

[0016] As a further technical solution, the light intensity signal amplifying unit is connected to the third input terminal and the fourth input terminal of the processing unit respectively.

[0017] As a further technical solution, the light intensity signal amplifying unit outputs the first light intensity signal and the second light intensity signal respectively, and the first light intensity signal and the second light intensity signal enter the processing unit through the third input end and the fourth input end respectively.

[0018] As a further technical solution, the processing unit includes a first output end and a second output end, and the first output end and the second output end are both connected to the dither driving unit.

[0019] As a further technical solution, the stabilization control unit includes: a frequency stabilization control drive module and a current stabilization control module; the frequency stabilization control drive module and the current stabilization control module are both connected to the output end of the processing unit.

[0020] As a further technical solution, the processing unit includes a third output terminal, a fourth output terminal, a fifth output terminal, a sixth output terminal and a seventh output terminal, and the third output terminal and the fourth output terminal are both connected to the frequency stabilization control drive module; the fifth output terminal, the sixth output terminal and the seventh output terminal are all connected to the current stabilization control module.

[0021] As a further technical solution, it also includes: a high-voltage module connected to the output end of the steady-flow control module.

[0022] The utility model also proposes a laser gyroscope, which includes a main body and a highly integrated circuit for the three-axis integrated laser gyroscope. The highly integrated circuit for the three-axis integrated laser gyroscope is arranged in the main body.

[0023] The technical solution of the present invention is to further process the signals received after processing by the jitter feedback conditioning unit, the photoelectric signal amplifying unit and the light intensity signal amplifying unit through the processing unit, and send the processing results to the jitter driving unit and the stabilization control unit respectively, so as to control the gyroscope body; and in the present invention, the processing unit, the jitter feedback conditioning unit, the photoelectric signal amplifying unit, the light intensity signal amplifying unit, the jitter driving unit and the stabilization control unit are all arranged on the same circuit board, so that the overall volume can be further reduced without affecting the overall control; at the same time, since they are arranged on the same circuit board, the mutual interference between the units can be eliminated, thereby improving the overall control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a circuit diagram of an advanced circuit for a three-axis integrated laser gyroscope according to the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] like Figure 1 As shown, the present invention proposes a highly integrated circuit for a three-axis integrated laser gyroscope, which is characterized by comprising:

[0030] The processing unit is preferably an ADuC7020 chip; the jitter feedback conditioning unit is connected to the input end of the processing unit and receives the jitter wheel feedback signal through the jitter feedback conditioning unit; the jitter driving unit is connected to the output end of the processing unit and receives the driving signal output by the processing unit through the jitter driving unit;

[0031] Among them, the jitter feedback conditioning unit obtains the jitter feedback signal sent by the piezoelectric ceramic on the resonant jitter wheel, processes the obtained jitter feedback signal, and then outputs a feedback signal, and transmits the feedback signal to the processing unit; specifically, the normal operating frequency of the jitter wheel is set to 500Hz, and after receiving the jitter feedback signal sent by the piezoelectric ceramic on the resonant jitter wheel, it is compared with the set normal operating frequency of the jitter wheel and the difference is output, and the feedback signal is output to the processing unit; a comparator is provided inside the processing unit, and the input feedback signal is processed by the comparator to form a drive signal DV, and the generated drive signal DV is transmitted to the jitter drive unit, and the resonant jitter wheel is controlled by the jitter drive unit. In the utility model, the drive signal DV is preferably output in the form of a jitter drive pulse width;

[0032] The photocurrent signal amplification unit is connected to the input end of the laser gyroscope test bench and receives the photocurrent signal output by the gyroscope through the photocurrent signal amplification unit. Specifically, the first photocurrent signal SS and the second photocurrent signal CS output by the gyroscope are transmitted to the photocurrent signal amplification unit. The photocurrent signal amplification unit processes the obtained first photocurrent signal SS and the second photocurrent signal CS and outputs two square wave signals. Specifically, the photocurrent signal amplification unit uses a photodetector in the prior art to convert the first photocurrent signal SS and the second photocurrent signal CS into two square wave signals respectively. The two output square wave signals are then transmitted to the laser gyroscope test bench, where they are phase-detected and counted and then jitter stripped. The number of pulses output by the gyroscope is obtained through the Sagnac effect of the optical gyroscope.

[0033] The light intensity signal amplifying unit is connected to the input end of the processing unit; the light intensity current signal LI output by the gyroscope is received through the light intensity signal amplifying unit; the stabilization control unit is connected to the output end of the processing unit; the frequency stabilization control signal output by the processing unit is received through the stabilization control unit; specifically, the light intensity signal amplifying unit processes the received light intensity current signal LI and outputs a first light intensity signal and a second light intensity signal, specifically, an optical amplifier in the prior art is used to amplify the light intensity current signal LI and form a first light intensity signal LIAC and a second light intensity signal LIDC; and the first light intensity signal LIA C and the second light intensity signal LIDC are transmitted to the processing unit, and the processing unit outputs a frequency stabilization control signal PCC and a small jitter square wave VIB after processing the first light intensity signal LIAC and the second light intensity signal LIDC; it is assumed that the data of the first light intensity signal LIAC and the second light intensity signal LIDC are collected for a time of 10s respectively, and the average value of the data is calculated to be a, and the average value of the normal light intensity is c, then: if a>c, the value of PCC is -1, which means that the laser driving frequency needs to be reduced (the higher the laser driving frequency, the greater the light intensity), and the square wave width of VIB is proportional to the size of (ac); if a <c,PCC的值为1,代表要增大激光驱动频率,VIB的方波宽度与(c-a)大小成正比;由此可知,PCC输出结果只-1或者1,-1代表减小,1代表增大;VIB的方波宽度与差值大小有关,具体要通过标定获得比例系数;

[0034] The frequency stabilization control signal PCC and the small jitter square wave VIB are transmitted to the stabilization control unit, the small jitter square wave VIB is output as a small jitter sine signal through a band-pass filter and is superimposed with the amplified frequency stabilization control signal to obtain a frequency stabilization driving signal PLC; wherein, the average value of the first light intensity signal LIAC and the second light intensity signal LIDC is set as a1, the normal light intensity average value is c, the square wave width of VIB is x, and the proportional factor can be obtained as (c-a1) / x; and PLC can be obtained through the formula PLC=PCC*(square wave width of VIB) / proportional factor.

[0035] The jitter feedback conditioning unit is connected with the first input end, the second input end and the third input end of the processing unit respectively; the jitter feedback conditioning unit outputs the first feedback signal DE_WC, the second feedback signal DE_W and the third feedback signal DAT respectively; and the first feedback signal DE_WC, the second feedback signal DE_W and the third feedback signal DAT enter the processing unit through the first input end, the second input end and the third input end respectively; the processing unit comprises a first output end and a second output end, and the first output end and the second output end are connected with the jitter driving unit.

[0036] Specifically, the first feedback signal DE_WC is a feedback sine signal, and the second feedback signal DE_W is a jitter feedback comparison threshold and a jitter feedback amplitude signal; the first feedback signal DE_WC and the second feedback signal DE_W are processed through the comparator arranged in the processing unit to obtain a jitter feedback period signal; the third feedback signal collects control information of the jitter driving signal intensity, and specifically collects a jitter wheel feedback signal in the form of a pulse of the processing unit; and the first jitter driving pulse width DTP and the second jitter driving pulse width DTN are output through the first output end and the second output end of the processing unit to the jitter driving unit to control the resonant jitter wheel; specifically, the sign of the feedback signal is the direction of the pulse width, and the value of the feedback signal is the length of the pulse width.

[0037] The light intensity signal amplification unit is connected with the third input end and the fourth input end of the processing unit respectively; the light intensity signal amplification unit outputs the first light intensity signal and the second light intensity signal respectively, and the first light intensity signal and the second light intensity signal enter the processing unit through the third input end and the fourth input end respectively; wherein, the first light intensity signal is an alternating current light intensity signal LIAC, and the second light intensity signal is a direct current light intensity signal LIDC; the first light intensity signal and the second light intensity signal are transmitted to the processing unit, and the processing unit processes the first light intensity signal and the second light intensity signal to output the frequency stabilization control signal PCC and the small jitter square wave VIB; the frequency stabilization control signal PCC and the small jitter square wave VIB are transmitted to the stabilization control unit.

[0038] The stabilization control unit includes: a frequency stabilization control drive module and a current stabilization control module; the frequency stabilization control drive module and the current stabilization control module are both connected to the output end of the processing unit; the processing unit includes a third output end, a fourth output end, a fifth output end, a sixth output end and a seventh output end;

[0039] The third output terminal and the fourth output terminal are both connected to the frequency stabilization control driving module; specifically, the third output terminal outputs the frequency stabilization control signal PCC, and the fourth output terminal outputs the small jitter square wave VIB; and the output frequency stabilization control signal PCC and the small jitter square wave VIB are transmitted to the frequency stabilization control driving module; the fifth output terminal, the sixth output terminal and the seventh output terminal are all connected to the current stabilization control module.

[0040] The high-voltage module is connected to the output end of the steady-current control module; and in the present invention, the high-voltage module is also connected to the frequency stabilization module, and after obtaining the steady-frequency drive signal PLC output by the frequency stabilization control drive module and the control signal HVFB output by the steady-current control module, the He-He gas in the wall of the laser gyroscope is excited to form an optical path.

[0041] The present utility model also proposes a laser gyroscope, which includes a main body and a highly integrated circuit for a three-axis integrated laser gyroscope. The highly integrated circuit for the three-axis integrated laser gyroscope is arranged in the main body; the laser gyroscope signal is obtained and the laser gyroscope is controlled through the highly integrated circuit of the three-axis integrated laser gyroscope.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A highly integrated circuit for a three-axis integrated laser gyroscope, characterized in that: include: processing unit; a jitter feedback conditioning unit for receiving a jitter wheel feedback signal, connected to an input terminal of the processing unit; a jitter driving unit for receiving a driving signal output by the processing unit, connected to an output terminal of the processing unit; A photocurrent signal amplifying unit for receiving a photocurrent signal, connected to an input terminal of the laser gyro test bench; A light intensity signal amplifying unit for receiving a light intensity current signal, connected to an input end of the processing unit; A stabilization control unit for receiving the frequency stabilization control signal output by the processing unit is connected to the output end of the processing unit.

2. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 1, characterized in that: The jitter feedback conditioning unit is connected to the first input terminal, the second input terminal and the third input terminal of the processing unit respectively.

3. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 2, characterized in that: The jitter feedback conditioning unit outputs a first feedback signal, a second feedback signal, and a third feedback signal respectively; and the first feedback signal, the second feedback signal, and the third feedback signal enter the processing unit through the first input terminal, the second input terminal, and the third input terminal respectively.

4. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 1, characterized in that: The light intensity signal amplifying unit is connected to the third input terminal and the fourth input terminal of the processing unit respectively.

5. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 4, characterized in that: The light intensity signal amplifying unit outputs a first light intensity signal and a second light intensity signal respectively, and the first light intensity signal and the second light intensity signal enter the processing unit through the third input end and the fourth input end respectively.

6. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 1, characterized in that: The processing unit includes a first output end and a second output end, and the first output end and the second output end are both connected to the dither driving unit.

7. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 1, characterized in that: The stabilization control unit includes: a frequency stabilization control driving module and a current stabilization control module; the frequency stabilization control driving module and the current stabilization control module are both connected to the output end of the processing unit.

8. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 7, characterized in that: The processing unit includes a third output terminal, a fourth output terminal, a fifth output terminal, a sixth output terminal and a seventh output terminal, the third output terminal and the fourth output terminal are both connected to the frequency stabilization control drive module; the fifth output terminal, the sixth output terminal and the seventh output terminal are all connected to the current stabilization control module.

9. The highly integrated circuit for a three-axis integrated laser gyroscope according to claim 7, characterized in that: Also includes: The high-voltage module is connected to the output end of the steady-current control module.

10. A laser gyroscope, comprising a main body, characterized in that: It also includes a highly integrated circuit for a three-axis integrated laser gyroscope as described in any one of claims 1 to 9, and the highly integrated circuit for a three-axis integrated laser gyroscope is arranged in the main body.

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