CN110987010B - Signal interference detection method, computer storage medium and computer equipment - Google Patents
Signal interference detection method, computer storage medium and computer equipment Download PDFInfo
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- CN110987010B CN110987010B CN201911284125.0A CN201911284125A CN110987010B CN 110987010 B CN110987010 B CN 110987010B CN 201911284125 A CN201911284125 A CN 201911284125A CN 110987010 B CN110987010 B CN 110987010B
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- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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Abstract
The invention belongs to a detection method of a high-precision optical fiber gyroscope signal processing circuit, and aims to solve the technical problem that whether interference exists between signals of the signal processing circuit can not be accurately evaluated when a dead zone exists in the working process of an optical fiber gyroscope in the prior art, the invention provides a signal interference detection method, a computer storage medium and computer equipment, wherein the interference between the signals in the signal processing circuit can be effectively detected under the condition that no additional instrument or circuit is added, a sine wave with controllable frequency is generated by an FPGA (field programmable gate array) in a core control unit and is input to a signal modulation and feedback unit, the sine wave is processed and then subjected to Fourier transform, and a corresponding time domain signal is converted into a frequency spectrum to be used as a standard signal; and then, the ground signal and the power signal are respectively input into a signal demodulation unit, the processed output is converted into frequency spectrum through Fourier transform, and the frequency spectrum is respectively compared with the standard signal to judge whether interference exists between the signals.
Description
Technical Field
The invention belongs to a detection method of a high-precision optical fiber gyroscope signal processing circuit, and particularly relates to a signal interference detection method, a computer storage medium and computer equipment.
Background
A Fiber Optic Gyroscope (FOG) is an optical Fiber angular velocity sensor based on the Sagnac effect, and a current digital closed-loop interference type optical Fiber Gyroscope is a relatively mature interference type optical Fiber Gyroscope, and consists of a light source, a light path and a signal processing circuit. The light source is mainly used for providing a proper optical signal required for generating the Sagnac effect for the optical fiber gyroscope, and obtaining an interference signal with a high signal-to-noise ratio due to high stable output optical power; the optical path part comprises a coupler, a Y waveguide and an optical fiber ring and is mainly used for obtaining the phase difference of interference signals through the Sagnac effect in a closed optical path; the signal processing circuit is mainly used for conditioning weak signals, realizing a closed-loop algorithm and corresponding modulation of the Y waveguide, and calculating and outputting angular rate.
As shown in fig. 1, the signal processing circuit of the fiber-optic gyroscope mainly comprises a signal demodulation unit 01, a core control unit 02, a signal modulation and feedback unit 03, a serial communication interface 04 and a power circuit 05. When the angular rate is input in the sensitive direction of the gyroscope from the outside, error information related to the angular rate is superposed on the output optical signal of the gyroscope, the optical signal is output and converted into a voltage signal through the PIN-FET, the voltage signal is conditioned through the signal demodulation unit 01, the voltage signal is converted into a digital signal through the analog-to-digital converter in the signal demodulation unit 01 after blocking, cutting a peak, amplifying, adjusting a bias voltage and converting a single end into a difference, and the digital signal is sent to the FPGA in the core control unit 02. On one hand, the FPGA acquires the digital signal, calculates the digital quantity of the input angular rate error signal, digitally modulates the angular rate information, outputs the feedback control quantity to the digital-to-analog converter in the signal modulation and feedback unit 03, and outputs the feedback control quantity to the Y waveguide of the gyroscope after passing through the amplifying and filtering circuit in the signal modulation and feedback unit 03, and adjusts the phase error signal generated by the input angular rate to the original working point to form closed-loop feedback. On the other hand, the FPGA carries out digital demodulation on the input error signal to obtain gyro sensitive angular rate output data, and the gyro data are output through the serial port communication circuit according to the protocol specification.
The fiber-optic gyroscope has been widely used in the field of inertial navigation due to its advantages of impact resistance, high sensitivity, long service life, large dynamic range, short start-up time, etc. With the development of the optical fiber gyroscope towards high precision, light weight and small size, the low-speed sensitivity index of the optical fiber gyroscope becomes poor, so that a dead zone in a certain range exists during the operation of the optical fiber gyroscope. When the fiber-optic gyroscope is used on an inertial navigation product, the existence of the dead zone may cause the errors of navigation precision and alignment precision to become large.
In the existing research, whether the optical fiber gyro has a dead zone is mostly measured by a rate turntable low-speed rotation test method or a flat plate eight-position placement test method, among a plurality of factors causing the dead zone, the interference between signals of an optical fiber gyro signal processing circuit is the most important factor, and if the dead zone exists through the test, but the factors causing the dead zone cannot be accurately and quickly separated, whether the dead zone is caused by the interference between the signals of the optical fiber gyro signal processing circuit cannot be evaluated.
Disclosure of Invention
The invention mainly aims to solve the technical problems that in the prior art, when a dead zone exists in the working process of a fiber-optic gyroscope, the interference between signals of a signal processing circuit cannot be accurately evaluated, and further whether the interference between the signals is a factor causing the dead zone of the fiber-optic gyroscope cannot be eliminated, and provides a signal interference detection method, a computer storage medium and computer equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
a signal interference detection method, characterized by comprising the steps of:
s1, obtaining a standard signal
S1.1, an FPGA in a core control unit generates a sine wave, and the sine wave is input to a signal modulation and feedback unit;
s1.2, after the sine wave is processed by a signal modulation and feedback unit, carrying out Fourier transform to obtain a frequency spectrum corresponding to the sine wave;
s2, ground signal comparison
S2.1, inputting a ground signal of the signal processing circuit into a signal demodulation unit, and controlling a core control unit to acquire the ground signal through an analog-to-digital converter in the signal demodulation unit through an FPGA (field programmable gate array) to obtain a discrete digital signal;
s2.2, carrying out Fourier transform on the discrete digital signal corresponding to the ground signal to obtain a frequency spectrum corresponding to the ground signal;
s2.3, comparing the frequency spectrum corresponding to the sine wave with the frequency spectrum corresponding to the ground signal, finding the amplitude value under the frequency corresponding to the sine wave in the frequency spectrum corresponding to the ground signal, and if the amplitude value corresponding to the frequency point which is greater than 0HZ in the frequency spectrum corresponding to the sine wave has magnitude difference, the ground signal has interference under the frequency corresponding to the sine wave between the signal modulation and feedback unit and the signal demodulation unit;
s3, comparing power signals
S3.1, inputting a power supply signal of the power supply circuit into a signal demodulation unit, and acquiring the power supply signal by a core control unit through an analog-to-digital converter in an FPGA control signal demodulation unit to obtain a discrete digital signal;
s3.2, carrying out Fourier transform on the discrete digital signal corresponding to the power signal to obtain a frequency spectrum corresponding to the power signal;
and S3.3, comparing the frequency spectrum corresponding to the sine wave with the frequency spectrum corresponding to the power signal, finding the amplitude value under the frequency corresponding to the sine wave in the frequency spectrum corresponding to the power signal, and if the amplitude value corresponding to the frequency point which is greater than 0HZ in the frequency spectrum corresponding to the sine wave has magnitude difference, the power signal has interference under the frequency corresponding to the sine wave between the signal modulation and feedback unit and the signal demodulation unit.
Further, in S1.1, the FPGA in the core control unit generates a sine wave, and a generation frequency of the sine wave covers at least a fifth harmonic of an eigenfrequency of the fiber optic gyroscope.
Further, in S2.1, the core control unit controls the analog-to-digital converter in the signal demodulation unit to acquire the ground signal through the FPGA, and the frequency of the ground signal acquired by the analog-to-digital converter is the frequency of the closed loop working state of the fiber-optic gyroscope and is less than or equal to 80% of the maximum sampling frequency of the analog-to-digital converter.
Further, in S3.1, the core control unit acquires a power signal through an analog-to-digital converter in the FPGA control signal demodulation unit, and a frequency of a ground signal acquired by the analog-to-digital converter is a frequency of a closed loop working state of the fiber-optic gyroscope and is less than or equal to 80% of a maximum sampling frequency of the analog-to-digital converter.
A computer-readable storage medium, on which a computer program is stored, characterized in that the program realizes the steps of the method as described above when executed by a processor.
Computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method as described above are implemented when the processor executes the program.
Compared with the prior art, the invention has the beneficial effects that:
1. the signal interference detection method can effectively detect the interference among signals in the signal processing circuit based on the original structure of the signal processing circuit without adding any additional instrument or circuit, generates a sine wave with controllable frequency through an FPGA (field programmable gate array) in a core control unit, inputs the sine wave into a signal modulation and feedback unit, performs Fourier transform after processing, and converts a corresponding time domain signal into a frequency spectrum as a standard signal; and then, the ground signal and the power signal are respectively input into the signal demodulation unit, the processed output is converted into frequency spectrum through Fourier transform, so that the frequency characteristics of the signals are clearer, the signals are respectively compared with standard signals to judge whether interference exists between the signal modulation and feedback unit and the signal demodulation unit, the detection method is simple and easy to realize, the frequency spectrum corresponding to sine waves is simple, and whether signal interference exists under a specified frequency point can be detected according to requirements.
2. The core control unit controls the acquisition frequency of the analog-to-digital converter to be less than or equal to 80% of the maximum sampling frequency of the analog-to-digital converter, and the analog-to-digital converter can work in the optimal state.
3. The computer-readable storage medium of the present invention stores the above-described detection method, and converts the detection method into a program for detecting signal interference.
4. The processor of the computer device of the present invention can execute the above signal interference detection method, and the computer device can be directly used for detection.
Drawings
FIG. 1 is a schematic diagram of a fiber-optic gyroscope signal processing circuit in the prior art;
in fig. 1, 01-signal demodulation unit, 02-core control unit, 03-signal modulation and feedback unit, 04-serial communication interface and 05-power supply circuit.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments do not limit the present invention.
In practical application, a fiber optic gyroscope has a relatively obvious nonlinear error under the condition of a relatively small input angular rate, particularly near a zero input, the output of the gyroscope is always zero, namely the gyroscope is insensitive to the input, namely a dead zone phenomenon exists. When the modulated signal output by the signal modulation and feedback unit is in crosstalk with the signal conditioning circuit, the gyroscope cannot be normally reset, and a dead zone exists in the gyroscope.
A signal interference detection method is used for evaluating the interference condition between signals, and other devices do not need to be connected externally on the basis of an original signal processing circuit, and the specific steps in one embodiment of the invention are as follows:
s1, obtaining a standard signal
S1.1, generating a sine wave by an FPGA (field programmable gate array) in a core control unit, wherein the frequency generated by the sine wave at least covers the fifth harmonic of the eigenfrequency of the fiber-optic gyroscope, and inputting the sine wave to a signal modulation and feedback unit;
s1.2, after the sine wave is processed by a signal modulation and feedback unit, carrying out Fourier transform to obtain a frequency spectrum corresponding to the sine wave;
s2, ground signal comparison
S2.1, inputting a ground signal of the signal processing circuit into a signal demodulation unit, and controlling a core control unit to acquire the ground signal through an analog-to-digital converter in the signal demodulation unit through an FPGA (field programmable gate array) to obtain a discrete digital signal; the core control unit can control the acquisition frequency of the analog-to-digital converter through the FPGA, and the frequency of the ground signal acquired by the analog-to-digital converter is the frequency of the closed loop working state of the fiber-optic gyroscope and is less than or equal to 80% of the maximum sampling frequency of the analog-to-digital converter;
s2.2, carrying out Fourier transform on the discrete digital signal corresponding to the ground signal to obtain a frequency spectrum corresponding to the ground signal;
s2.3, comparing the frequency spectrum corresponding to the sine wave with the frequency spectrum corresponding to the ground signal, finding the amplitude value under the frequency corresponding to the sine wave in the frequency spectrum corresponding to the ground signal, and if the amplitude value corresponding to the frequency point which is greater than 0HZ in the frequency spectrum corresponding to the sine wave has magnitude difference, the ground signal has interference under the frequency corresponding to the sine wave between the signal modulation and feedback unit and the signal demodulation unit;
s3, comparing power signals
S3.1, inputting a power supply signal of the power supply circuit into a signal demodulation unit, and acquiring the power supply signal by a core control unit through an analog-to-digital converter in an FPGA control signal demodulation unit to obtain a discrete digital signal; the core control unit can control the acquisition frequency of the analog-to-digital converter through the FPGA, and the frequency of the ground signal acquired by the analog-to-digital converter is the frequency of the closed loop working state of the fiber-optic gyroscope and is less than or equal to 80% of the maximum sampling frequency of the analog-to-digital converter;
s3.2, carrying out Fourier transform on the discrete digital signal corresponding to the power signal to obtain a frequency spectrum corresponding to the power signal;
and S3.3, comparing the frequency spectrum corresponding to the sine wave with the frequency spectrum corresponding to the power signal, finding the amplitude value under the frequency corresponding to the sine wave in the frequency spectrum corresponding to the power signal, and if the amplitude value corresponding to the frequency point which is greater than 0HZ in the frequency spectrum corresponding to the sine wave has magnitude difference, the power signal has interference under the frequency corresponding to the sine wave between the signal modulation and feedback unit and the signal demodulation unit.
S2.3 is similar to S3.3 in that a frequency point of a sine wave is found in the ground signal spectrum or the power signal spectrum, and then an amplitude corresponding to the frequency point is compared with an amplitude at a frequency point other than 0Hz in the ground signal spectrum or the power signal spectrum, and if there is signal crosstalk, the amplitude at the frequency point will have a significant magnitude difference compared with amplitudes at other frequency points. The detection method can be used for detecting the signal interference condition under the frequency corresponding to the sine wave, and can more accurately detect whether the signal interference exists under the specified frequency point according to the requirement.
The detection method is to detect whether there is signal interference from the signal modulation and feedback unit to the signal demodulation unit, if the signal component of the signal modulation and feedback unit is detected in the signal of the signal demodulation unit, the interference can be considered to exist, the signal is processed with Fourier transform, the frequency characteristic of the signal can be clearer, and the judgment is easier. In addition, it may also be determined whether the signal interference is caused by a ground signal, a power signal, or both. In actual detection, only the ground signal or only the power signal may be detected as required.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A signal interference detection method, comprising the steps of:
s1, obtaining a standard signal
S1.1, an FPGA in a core control unit generates a sine wave, and the sine wave is input to a signal modulation and feedback unit;
s1.2, after the sine wave is processed by a signal modulation and feedback unit, carrying out Fourier transform to obtain a frequency spectrum corresponding to the sine wave;
s2, ground signal comparison
S2.1, inputting a ground signal of the signal processing circuit into a signal demodulation unit, and controlling a core control unit to acquire the ground signal through an analog-to-digital converter in the signal demodulation unit through an FPGA (field programmable gate array) to obtain a discrete digital signal;
the frequency of the ground signal collected by the analog-to-digital converter is the frequency of the closed loop working state of the fiber-optic gyroscope, and is less than or equal to 80% of the maximum sampling frequency of the analog-to-digital converter;
s2.2, carrying out Fourier transform on the discrete digital signal corresponding to the ground signal to obtain a frequency spectrum corresponding to the ground signal;
s2.3, comparing the frequency spectrum corresponding to the sine wave with the frequency spectrum corresponding to the ground signal, finding the amplitude value under the frequency corresponding to the sine wave in the frequency spectrum corresponding to the ground signal, and if the amplitude value corresponding to the frequency point which is greater than 0HZ in the frequency spectrum corresponding to the sine wave has magnitude difference, the ground signal has interference under the frequency corresponding to the sine wave between the signal modulation and feedback unit and the signal demodulation unit;
s3, comparing power signals
S3.1, inputting a power supply signal of the power supply circuit into a signal demodulation unit, and acquiring the power supply signal by a core control unit through an analog-to-digital converter in an FPGA control signal demodulation unit to obtain a discrete digital signal;
the frequency of the ground signal collected by the analog-to-digital converter is the frequency of the closed loop working state of the fiber-optic gyroscope, and is less than or equal to 80% of the maximum sampling frequency of the analog-to-digital converter;
s3.2, carrying out Fourier transform on the discrete digital signal corresponding to the power signal to obtain a frequency spectrum corresponding to the power signal;
and S3.3, comparing the frequency spectrum corresponding to the sine wave with the frequency spectrum corresponding to the power signal, finding the amplitude value under the frequency corresponding to the sine wave in the frequency spectrum corresponding to the power signal, and if the amplitude value corresponding to the frequency point which is greater than 0HZ in the frequency spectrum corresponding to the sine wave has magnitude difference, the power signal has interference under the frequency corresponding to the sine wave between the signal modulation and feedback unit and the signal demodulation unit.
2. The signal interference detection method of claim 1, wherein: in S1.1, an FPGA in the core control unit generates sine waves, and the frequency generated by the sine waves at least covers the fifth harmonic of the eigenfrequency of the fiber-optic gyroscope.
3. A computer-readable storage medium having stored thereon a computer program, characterized in that: which program, when being executed by a processor, carries out the steps of the method as claimed in claim 1 or 2.
4. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: the processor, when executing the program, implements the steps of the method of claim 1 or 2.
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| CN1945209A (en) * | 2006-10-20 | 2007-04-11 | 北京航空航天大学 | Combined modulating and demodulating method for inhibiting optic fiber gyroscope cross interference |
| CN101071068A (en) * | 2007-06-20 | 2007-11-14 | 北京航空航天大学 | Co-channel interference measuring method of signal processing device for interference optical fiber gyroscope |
| CN103313070A (en) * | 2012-03-16 | 2013-09-18 | 三星电子株式会社 | Broadcast receiving apparatus and method for removing interference signal of analog broadcast signal |
| CN107607101A (en) * | 2017-11-05 | 2018-01-19 | 西北工业大学 | MEMS gyro sliding-mode control based on interference observer |
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| US7038783B2 (en) * | 2003-05-23 | 2006-05-02 | Honeywell International Inc. | Eigen frequency detector for Sagnac interferometers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945209A (en) * | 2006-10-20 | 2007-04-11 | 北京航空航天大学 | Combined modulating and demodulating method for inhibiting optic fiber gyroscope cross interference |
| CN101071068A (en) * | 2007-06-20 | 2007-11-14 | 北京航空航天大学 | Co-channel interference measuring method of signal processing device for interference optical fiber gyroscope |
| CN103313070A (en) * | 2012-03-16 | 2013-09-18 | 三星电子株式会社 | Broadcast receiving apparatus and method for removing interference signal of analog broadcast signal |
| CN107607101A (en) * | 2017-11-05 | 2018-01-19 | 西北工业大学 | MEMS gyro sliding-mode control based on interference observer |
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