CN211477159U - Miniaturized optical fiber strapdown inertial measurement unit data processing circuit - Google Patents
Miniaturized optical fiber strapdown inertial measurement unit data processing circuit Download PDFInfo
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- CN211477159U CN211477159U CN202020134291.4U CN202020134291U CN211477159U CN 211477159 U CN211477159 U CN 211477159U CN 202020134291 U CN202020134291 U CN 202020134291U CN 211477159 U CN211477159 U CN 211477159U
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Abstract
The utility model discloses a miniaturized optical fiber strapdown inertial measurement unit data processing circuit, which comprises a digital signal processor, and an optical fiber gyro signal acquisition circuit, an acceleration signal acquisition circuit and a communication interface circuit which are respectively electrically connected with the digital signal processor; the data signal processor demodulates the angular velocity signal acquired by the optical fiber gyroscope signal acquisition circuit and the acceleration signal acquired by the acceleration signal acquisition circuit respectively, and outputs the demodulated angular velocity signal and the demodulated acceleration signal through the communication interface circuit; the utility model discloses an integrate the design, realize optic fibre top signal, acceleration signal and data processing through a digital signal processing chip, have small, with low costs, the low power dissipation, advantage that the reliability is high.
Description
Technical Field
The utility model belongs to the technical field of data processing, more specifically relates to a miniaturized optic fibre strapdown is used to group data processing circuit.
Background
The optical fiber strapdown inertial measurement unit has the outstanding advantages of no rotating part structure, large dynamic range, strong shock resistance, small volume, light weight, long service life, low power consumption, low cost and the like. Due to the advantages, the optical fiber strapdown inertial measurement unit gradually replaces the traditional mechanical inertial measurement unit in many fields, and is widely applied to the fields of aerospace, weapon navigation, robot control, oil drilling, railway detection and the like. The optical fiber strapdown inertial measurement unit mainly comprises an optical fiber gyroscope, an accelerometer, a power panel, a data processing panel and a structural member, wherein the data processing panel is a core processing module of the optical fiber strapdown inertial measurement unit, and the functions of the data processing panel are particularly important.
In order to adapt to various complex application environment conditions, the important development direction of the optical fiber strapdown inertial measurement unit is miniaturization and integration, and the miniaturization and integration design is a great challenge for a data processing board circuit. The inertial sensors in the conventional optical fiber strapdown inertial measurement unit usually have respective independent processing circuit boards, and a common data processing board circuit is added, so that the circuit design is slightly redundant, and the miniaturization design of the optical fiber strapdown inertial measurement unit is not facilitated. How to realize the fusion design of the independent processing circuit board and the data processing board circuit of the inertial sensor is of great significance to the miniaturization design of the optical fiber strapdown inertial measurement unit. Therefore, it is particularly important to design a miniaturized fiber strapdown inertial measurement data processing board circuit.
SUMMERY OF THE UTILITY MODEL
Aiming at least one defect or improvement requirement in the prior art, the utility model provides a miniaturized optical fiber strapdown inertial group data processing circuit, which adopts the integrated design, the whole structure of the circuit is simple and independent, the digital signal processor only has one FPGA chip, and the functions of all parts of the circuit are relatively independent; the communication interface module sends the processed data information to a navigation computer for navigation resolving, and the communication interface module has the characteristics of simplicity, practicability, small size, low power consumption and low cost.
In order to achieve the above object, according to an aspect of the present invention, there is provided a miniaturized fiber optic strapdown inertial measurement unit data processing circuit, including a digital signal processor, and a fiber optic gyroscope signal acquisition circuit, an acceleration signal acquisition circuit and a communication interface circuit electrically connected to the digital signal processor, respectively;
the data signal processor respectively demodulates the angular velocity signal acquired by the optical fiber gyroscope signal acquisition circuit and the acceleration signal acquired by the acceleration signal acquisition circuit, and outputs the demodulated angular velocity signal and the demodulated acceleration signal through the communication interface circuit.
Preferably, in the miniaturized fiber optic strapdown inertial measurement unit data processing circuit, the fiber optic gyroscope signal acquisition circuit includes a first operational amplifier, a first differential amplifier and a first a/D conversion chip, which are connected in sequence;
the input end of the first operational amplifier receives an angular velocity signal of the fiber-optic gyroscope, and the output end of the first A/D conversion chip is connected with the first input end of the digital signal processor; the angular velocity signal is amplified and subjected to analog-to-digital conversion and then is sent to the digital signal processor through the first A/D conversion chip.
Preferably, in the miniaturized fiber strapdown inertial measurement unit data processing circuit, the fiber-optic gyroscope signal acquisition circuit further includes a D/a conversion chip and a second operational amplifier connected to each other;
the input end of the D/A conversion chip is connected with the first output end of the digital signal processor, and the output end of the second operational amplifier is connected with an external signal modulator; the D/A conversion chip converts the angular velocity signal demodulated by the digital signal processor into an analog signal, and the second operational amplifier amplifies the analog signal and feeds the amplified analog signal back to the signal modulator.
Preferably, in the miniaturized optical fiber strapdown inertial measurement unit data processing circuit, the optical fiber gyro signal acquisition circuit further includes an analog switch tip removal circuit;
the input end of the analog switch tipple removal circuit receives an angular velocity signal of the optical fiber gyro, the output end of the analog switch tipple removal circuit is connected with the input end of the first operational amplifier, and the angular velocity signal of the optical fiber gyro is filtered and then sent to the first operational amplifier.
Preferably, the acceleration signal acquisition circuit of the miniaturized optical fiber strapdown inertial measurement unit data processing circuit comprises a sampling circuit and a second a/D conversion chip which are connected with each other;
the input end of the sampling circuit receives an acceleration signal of the accelerometer, and the output end of the second A/D conversion chip is connected with the second input end of the digital signal processor; and the acceleration signal is amplified and subjected to analog-to-digital conversion and then is sent to the digital signal processor through the second A/D conversion chip.
Preferably, the sampling circuit of the miniaturized fiber strapdown inertial measurement unit data processing circuit includes a sampling resistor, a third operational amplifier and a second differential amplifier, which are connected in sequence.
Preferably, the acceleration signal acquisition circuit of the miniaturized optical fiber strapdown inertial measurement unit data processing circuit further includes a resonator, which is used for providing a clock signal for the second a/D conversion chip.
Preferably, the acceleration signal acquisition circuit of the miniaturized optical fiber strapdown inertial measurement unit data processing circuit further includes a reference voltage chip for providing a reference voltage for the second a/D conversion chip.
Preferably, the miniaturized optical fiber strapdown inertial measurement unit data processing circuit further comprises a power module;
and the power supply module is respectively connected with the digital signal processor, the fiber-optic gyroscope signal acquisition circuit, the acceleration signal acquisition circuit and the communication interface circuit and provides working voltage for each functional circuit.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the whole circuit framework is simple and independent, the digital signal processing module only has one FPGA chip, and the functions of all parts of the circuit are relatively independent.
(2) The integrated design is adopted, the signal processing of the fiber-optic gyroscope, the acceleration signal and the data processing are realized through a digital signal processing chip, and the integrated optical gyroscope is small in size, low in cost, low in power consumption and high in reliability.
Drawings
Fig. 1 is a logic block diagram of a miniaturized optical fiber strapdown inertial measurement data processing circuit provided in an embodiment of the present invention;
fig. 2 is a detailed structural diagram of a miniaturized optical fiber strapdown inertial measurement data processing circuit according to an embodiment of the present invention;
fig. 3 is a circuit structure diagram of a part of the signal acquisition circuit of the fiber-optic gyroscope according to the embodiment of the present invention;
fig. 4 is a circuit structure diagram of a part of the acceleration signal acquisition circuit provided in the embodiment of the present invention;
fig. 5 is a circuit structure diagram of a power module according to an embodiment of the present invention;
fig. 6 is a circuit structure diagram of a communication interface circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 is a logic block diagram of a miniaturized fiber optic strapdown inertial measurement data processing circuit provided in this embodiment, as shown in fig. 1, the data processing circuit includes a digital signal processor, and a fiber optic gyroscope signal acquisition circuit, an acceleration signal acquisition circuit, and a communication interface circuit that are electrically connected to the digital signal processor, respectively;
the optical fiber gyroscope signal acquisition circuit is mainly used for acquiring angular velocity signals of the optical fiber gyroscope, and the acceleration signal acquisition circuit is mainly used for acquiring acceleration signals of the accelerometer;
the data signal processor demodulates the angular velocity signal and the angular velocity signal respectively, and outputs the demodulated angular velocity signal and the demodulated acceleration signal to the navigation computer through the communication interface circuit, and the navigation computer performs navigation calculation. The data signal processor stores the commonly used angular velocity and acceleration signal demodulation and processing programs.
Fig. 2 is a detailed structure diagram of a miniaturized fiber optic strapdown inertial measurement unit data processing circuit provided in this embodiment, and referring to fig. 2, in this embodiment, a fiber optic gyroscope signal acquisition circuit includes an analog switch tipple removal circuit, a first operational amplifier, a first differential amplifier, and a first a/D conversion chip, which are connected in sequence;
the input end of the analog switch tipple removal circuit is used for receiving an angular velocity signal of the fiber-optic gyroscope, and the output end of the first A/D conversion chip is connected with the first input end of the digital signal processor; the angular velocity signal is amplified and subjected to analog-to-digital conversion and then is sent to the digital signal processor through the first A/D conversion chip.
Specifically, firstly, an angular velocity signal of the fiber optic gyroscope is converted into an electrical signal through a photoelectric detector; the analog switch de-sharpening circuit filters and de-sharpens a weak electric signal output by the photoelectric detector, then the weak electric signal is filtered and amplified by the first operational amplifier, the weak electric signal is converted into a differential signal by the first differential amplifier and then input into the first A/D conversion chip, and the differential signal is converted into a digital signal by the first A/D conversion chip.
The digital signal processor receives the digital signal sent by the first A/D conversion chip and demodulates the digital signal to obtain a fiber-optic gyroscope modulation signal, and the fiber-optic gyroscope modulation signal is output to the navigation computer through the communication interface circuit.
As a preferable example of this embodiment, the fiber-optic gyroscope signal acquisition circuit further includes a D/a conversion chip and a second operational amplifier connected to each other; the input end of the D/A conversion chip is connected with the first output end of the digital signal processor, and the output end of the second operational amplifier is connected with an external signal modulator;
after the digital signal processor generates the optical fiber gyro modulation signal, the square wave signal is generated according to the optical fiber gyro modulation signal and is sent to a D/A conversion chip in the optical fiber gyro signal acquisition circuit, the square wave signal is converted into an analog signal by the D/A conversion chip, the analog signal obtained by conversion is amplified by a second operational amplifier and then fed back to the signal modulator, and the digital closed-loop signal processing of the optical fiber gyro is completed.
As shown in fig. 2, in this embodiment, the acceleration signal acquisition circuit includes a sampling circuit and a second a/D conversion chip connected to each other;
the input end of the sampling circuit receives an acceleration signal of the accelerometer, and the output end of the second A/D conversion chip is connected with the second input end of the digital signal processor; the acceleration signal is amplified and subjected to analog-to-digital conversion and then is sent to the digital signal processor through the second A/D conversion chip.
Specifically, firstly, an acceleration signal of an accelerometer is converted into an electric signal through a photoelectric detector; the sampling circuit collects the electric signal and converts the electric signal into a voltage signal, then the voltage signal is filtered and converted into a differential signal, and the differential signal is output to the second A/D conversion chip and converted into a digital signal by the second A/D conversion chip.
And the digital signal processor demodulates the digital signal sent by the second A/D conversion chip to obtain an accelerometer modulation signal, and outputs the accelerometer modulation signal to the navigation computer through the communication interface circuit.
In addition, the digital signal processor also carries out error compensation and temperature compensation on the fiber-optic gyroscope modulation signal and the accelerometer modulation signal before outputting the fiber-optic gyroscope modulation signal and the accelerometer modulation signal to the navigation computer, eliminates the interference of abnormal factors and improves the signal acquisition precision. In the embodiment, the digital signal processor selects SPARTAN6 series FPGA chip XC6SLX45-2CSG 324.
In this embodiment, the sampling circuit includes a precision sampling resistor, a third operational amplifier, and a second differential amplifier, which are connected in sequence; the precise sampling resistor is used for converting the electric signal into a voltage signal, and the third operational amplifier is used for filtering and amplifying the voltage signal; the second differential amplifier is used for converting the amplified voltage signal into a differential signal and transmitting the differential signal to the second A/D conversion chip.
In addition, the acceleration signal acquisition circuit also comprises a resonator and a reference voltage chip, wherein the resonator is mainly used for providing a clock signal for the second A/D conversion chip. The reference voltage chip is mainly used for providing reference voltage for the second A/D conversion chip.
The miniaturized optical fiber strapdown inertial group data processing circuit provided by the embodiment further comprises a power supply module; the power supply module is respectively connected with the digital signal processor, the fiber-optic gyroscope signal acquisition circuit, the acceleration signal acquisition circuit and the communication interface circuit, and provides working voltage for each functional circuit.
Fig. 3 is a partial circuit structure diagram of the fiber-optic gyroscope signal acquisition circuit provided in this embodiment, and as shown in fig. 3, the fiber-optic gyroscope signal acquisition circuit includes a first AD conversion chip, a DA conversion chip, and a second operational amplifier; in this embodiment, the AD conversion chip D1 selects AD9235, the DA conversion chip D2 selects MAX5885, and the operational amplifier N1 selects AD 8139. In fig. 3, VIN + and VIN-are the fiber-optic gyroscope forward-amplifying differential signals output by the first differential amplifier, REF is a reference voltage, VOUT + and VOUT-are the fiber-optic gyroscope modulation signals output by the second operational amplifier, CLK is an AD clock signal, AD0 to AD11 are 12-bit AD data, CLKP is a DA clock signal, and DA0 to DA15 are 16-bit DA data. By adjusting the resistors R10 and R12, the resistor R11 and the resistor R13, the voltage output by the second operational amplifier to the signal modulator is ensured to be in a proper range.
Fig. 4 is a circuit structure diagram of a part of the acceleration signal acquisition circuit provided in the present embodiment, and as shown in fig. 4, the acceleration signal acquisition circuit includes a sampling resistor, a second AD conversion chip, a reference voltage chip, and a resonator; in this embodiment, the ADs1210 is selected as the second AD conversion chip D3, the AD780 is selected as the reference voltage chip U4, and the JA110 is selected as the resonator G1.
In fig. 4, R13 is a sampling resistor, AIN is an accelerometer input current signal, DRDY is a data ready signal, SDOUT is a data output, SDIO is a data input, and SCLK is a data clock. The resistance value deviation of the sampling resistor R13 is small, the precision is high, the variation quantity influenced by the temperature is small, and the accuracy of the acquired current signal is ensured.
A resonator G1 is arranged between the 7 end and the 8 end of the second AD conversion chip D3, the two ends of the resonator G1 are grounded through a capacitor C41 and a capacitor C42 respectively, and the capacitors C41 and C42 ensure that the resonator G1 works normally to generate a clock signal required by the work of the second AD conversion chip.
Fig. 5 is a circuit structure diagram of the power module provided in this embodiment, and as shown in fig. 5, the power module mainly includes a power conversion chip U2 and a power conversion chip U3, where the power conversion chip U2 selects LTM4622, and the power conversion chip U3 selects TPS 73625. The terminal connection is as follows: a2 end, an E2 end, a B3 end, a D3 end, a D2 end, a B2 end is connected with +5V, a capacitor C22 is arranged between the A2 end, the D4 end is connected with +5V through a resistor R5, a B4 end is connected with +5V through a resistor R4, a C1 end, a C2 end, a B5 end, a C5 end and a D5 end are grounded, a capacitor C23 is arranged between the E3 end and the ground, a capacitor C24 is arranged between the A3 end and the ground, a capacitor R6 is arranged between the C4 end and the ground, a capacitor R7 is arranged between the E4 end and the ground, a capacitor R8 is arranged between the A4 end and the ground, a D1 end, an E1 end is connected with +3.3V, a capacitor C27 and a capacitor C28 are arranged between the ground, a1 end and a capacitor C1; the 1 end and the 3 end of the U3 are connected with +3.3V, a capacitor C29 is arranged between the 3 end and the ground, the 2 end is grounded, a capacitor C30 is arranged between the 4 end and the ground, the 5 end is connected with +2.5V, and a capacitor C31 is arranged between the 5 end and the ground.
Fig. 6 is a circuit structure diagram of the communication interface circuit provided in this embodiment, where the communication interface circuit includes an interface chip D5, and the interface chip D5 selects MAX 3490. The terminal connection is as follows: the 1 end is connected with +3.3V, a capacitor C32 is arranged between the 1 end and the ground, the 5 end and the 6 end are differential signal outputs, the 7 end and the 8 end are differential signal inputs, and a resistor R9 is arranged between the 7 end and the 8 end.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A miniaturized optical fiber strapdown inertial measurement unit data processing circuit is characterized by comprising a digital signal processor, and an optical fiber gyro signal acquisition circuit, an acceleration signal acquisition circuit and a communication interface circuit which are respectively and electrically connected with the digital signal processor;
the data signal processor respectively demodulates the angular velocity signal acquired by the optical fiber gyroscope signal acquisition circuit and the acceleration signal acquired by the acceleration signal acquisition circuit, and outputs the demodulated angular velocity signal and the demodulated acceleration signal through the communication interface circuit.
2. The miniaturized fiber optic strapdown inertial measurement unit data processing circuit of claim 1, wherein the fiber optic gyroscope signal acquisition circuit comprises a first operational amplifier, a first differential amplifier and a first a/D conversion chip which are connected in sequence;
the input end of the first operational amplifier receives an angular velocity signal of the fiber-optic gyroscope, and the output end of the first A/D conversion chip is connected with the first input end of the digital signal processor; the angular velocity signal is amplified and subjected to analog-to-digital conversion and then is sent to the digital signal processor through the first A/D conversion chip.
3. The miniaturized fiber optic strapdown inertial measurement data processing circuit of claim 2, wherein the fiber optic gyroscope signal acquisition circuit further comprises a D/a conversion chip and a second operational amplifier connected to each other;
the input end of the D/A conversion chip is connected with the first output end of the digital signal processor, and the output end of the second operational amplifier is connected with an external signal modulator; the D/A conversion chip converts the angular velocity signal demodulated by the digital signal processor into an analog signal, and the second operational amplifier amplifies the analog signal and feeds the amplified analog signal back to the signal modulator.
4. The miniaturized fiber optic strapdown inertial measurement data processing circuit of claim 2 or 3, wherein the fiber optic gyroscope signal acquisition circuit further comprises an analog switch de-pointing circuit;
the input end of the analog switch tipple removal circuit receives an angular velocity signal of the optical fiber gyro, the output end of the analog switch tipple removal circuit is connected with the input end of the first operational amplifier, and the angular velocity signal of the optical fiber gyro is filtered and then sent to the first operational amplifier.
5. The miniaturized fiber optic strapdown inertial data processing circuit according to claim 1 or 3, wherein the acceleration signal collecting circuit comprises a sampling circuit and a second A/D conversion chip which are connected;
the input end of the sampling circuit receives an acceleration signal of the accelerometer, and the output end of the second A/D conversion chip is connected with the second input end of the digital signal processor; and the acceleration signal is amplified and subjected to analog-to-digital conversion and then is sent to the digital signal processor through the second A/D conversion chip.
6. The miniaturized fiber optic strapdown inertial measurement data processing circuit of claim 5, wherein the sampling circuit comprises a sampling resistor, a third operational amplifier and a second differential amplifier connected in sequence.
7. The miniaturized fiber optic strapdown inertial data processing circuit of claim 5, wherein the acceleration signal acquisition circuit further comprises a resonator for providing a clock signal to the second A/D conversion chip.
8. The miniaturized fiber optic strapdown inertial data processing circuit of claim 5, wherein the acceleration signal collecting circuit further comprises a reference voltage chip for providing a reference voltage to the second A/D converting chip.
9. The miniaturized fiber optic strapdown inertial data processing circuit of claim 1, further comprising a power module;
and the power supply module is respectively connected with the digital signal processor, the fiber-optic gyroscope signal acquisition circuit, the acceleration signal acquisition circuit and the communication interface circuit and provides working voltage for each functional circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514048A (en) * | 2021-06-15 | 2021-10-19 | 北京航天时代光电科技有限公司 | High-reliability miniaturized fiber-optic gyroscope signal processing and interface circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514048A (en) * | 2021-06-15 | 2021-10-19 | 北京航天时代光电科技有限公司 | High-reliability miniaturized fiber-optic gyroscope signal processing and interface circuit |
| CN113514048B (en) * | 2021-06-15 | 2022-08-12 | 北京航天时代光电科技有限公司 | High-reliability miniaturized fiber-optic gyroscope signal processing and interface circuit |
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