CN116840578B - Fluid noise interference cancellation method and device for dynamic measurement of underwater electric field - Google Patents
Fluid noise interference cancellation method and device for dynamic measurement of underwater electric field Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
- G01R29/14—Measuring field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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Abstract
The application provides a fluid noise interference cancellation method and device for dynamic measurement of an underwater electric field, comprising an aircraft, an electric field sensor matrix, a speed measurement module and an acceleration measurement module.
Description
Technical Field
The application relates to the technical field of underwater electric field signal processing, in particular to a fluid noise interference cancellation method and device for dynamic measurement of an underwater electric field.
Background
In the navigation process of underwater targets such as underwater ships, submarines and various underwater vehicles, an electrochemical corrosion or sacrificial anode protection device of an underwater metal part of the underwater targets can generate underwater electric field signals (the electric field signals are divided into electrostatic fields and alternating electric fields), the underwater electric field signals can be passively received by an electric field sensor array arranged on the underwater vehicle, and in the receiving process, the electric field sensor obtains the underwater electric field signals by acquiring potential difference measurement in an underwater space.
In the course of navigation, the underwater vehicle moves relative to sea water, sea water flows through the electrodes of the electric field sensor array as conductive fluid, according to the electromagnetic induction principle, an induction electric field related to the relative flow velocity of sea water can be generated between the electrodes, but the generated induction electric field can interfere the measurement of underwater ship, submarine and various underwater vehicles and other underwater target electric field signals (including electrostatic fields and alternating electric fields), and the interference can have adverse effects on the real space distribution characteristics of the measured target underwater electric field.
Therefore, it is necessary to provide a method and a device for canceling noise interference of fluid in dynamic measurement of underwater electric field to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the application provides a method and a device for canceling fluid noise interference in underwater electric field dynamic measurement, which are characterized in that a speed signal is measured by a speed measuring module on an aircraft, and the gain multiple of a gain control circuit of a signal conditioning module is reversely controlled by the speed signal so as to cancel a direct current interference signal generated by sea water fluid in constant-speed navigation; the acceleration signal measured by the acceleration measuring module of the aircraft is input into the phase-locked tracking filter circuit, so that alternating-current interference signals generated by the sea water fluid during speed changing navigation of the aircraft are filtered, and signal interference of the sea water fluid on electric field signals during navigation of the aircraft is eliminated.
The application provides an underwater electric field dynamic measurement fluid noise interference cancellation device, which comprises an aircraft, an electric field sensor matrix, a speed measurement module and an acceleration measurement module, wherein the electric field sensor matrix, the speed measurement module and the acceleration measurement module are arranged on the aircraft, electric field signals are measured by the electric field sensor matrix, speed signals of the aircraft are measured by the speed measurement module, and acceleration signals of the aircraft are measured by the acceleration measurement module;
the system also comprises a signal conditioning module, the signal conditioning module comprises a gain control circuit and a filter circuit which are coupled and connected, the electric field sensor matrix and the speed measuring module are electrically connected with the signal input end of the gain control circuit, the acceleration measuring module is electrically connected with the signal input end of the filter circuit,
the gain control circuit is used for outputting a gain control signal according to an input speed signal, and canceling direct-current voltage interference generated during constant-speed navigation through the gain control signal, and comprises a gain amplifier and an inverting amplifier which are electrically connected;
the filtering circuit is used for controlling the notch frequency according to the input acceleration signal, filtering alternating voltage interference generated during speed-changing navigation through the notch frequency, and comprises a limiting amplifier, a shaping circuit, a frequency doubling circuit and a band elimination filter which are electrically connected.
Preferably, the electric field sensor matrix includes electric field sensors arranged in an X-direction and in a Y-direction.
Preferably, the speed measuring module is an electromagnetic speed measuring module arranged at the bottom of the aircraft.
Preferably, the acceleration measurement module is a MEMS accelerometer mounted at the bottom of the aircraft.
Preferably, the inverting amplifier comprises an operational amplifier and is electrically connected with the operational amplifier in an output resistor R3 and a feedback resistor R4.
Preferably, the gain control circuit further comprises a divider resistor R1 and a divider resistor R2 electrically connected with the gain amplifier.
Preferably, the filter circuit is a phase-locked tracking band-stop filter circuit.
Preferably, the shaping circuit comprises a comparator and a pull-up resistor R4 which are electrically connected.
Preferably, the multiple of the frequency multiplication circuit is fifty times, and the frequency multiplication circuit comprises a phase-locked loop and a counter which are electrically connected.
The application also discloses a fluid noise interference cancellation method for dynamic measurement of the underwater electric field, which is applied to the fluid noise interference cancellation device for dynamic measurement of the underwater electric field, and the cancellation method comprises the following steps:
generating an electric field signal from the electric field sensor matrix;
measuring the navigation speed of the underwater vehicle by the speed measuring module and generating a speed signal;
measuring acceleration of the underwater vehicle by the acceleration measuring module and generating an acceleration signal;
inputting the speed signal into the gain control circuit, outputting a gain control signal by the gain control circuit, and counteracting direct-current voltage interference generated during constant-speed navigation through the gain control signal;
and inputting the acceleration signal into the filter circuit, outputting a notch frequency by the filter circuit, and filtering alternating voltage interference generated during variable speed navigation through the notch frequency.
Compared with the related art, the method and the device for canceling the noise interference of the fluid in the underwater electric field dynamic measurement have the following beneficial effects:
according to the application, the speed signal is measured by the speed measuring module on the aircraft, and the gain multiple of the gain control circuit of the signal conditioning module is reversely controlled by the speed signal so as to offset the direct-current voltage interference signal generated by the seawater fluid during constant-speed navigation, thereby ensuring the reliability of the acquired space distribution characteristic of the underwater electric field.
According to the application, the acceleration signal measured by the acceleration measuring module of the aircraft is input into the phase-locked tracking filter circuit, the alternating voltage interference signal generated by the sea water fluid during speed changing navigation of the aircraft is filtered by controlling the notch frequency of the filter circuit, and the reliability of the acquired space distribution characteristic of the underwater electric field is ensured.
Drawings
FIG. 1 is a schematic diagram of a device for dynamically measuring fluid noise interference cancellation of an underwater electric field;
FIG. 2 is a schematic diagram of a gain control circuit of an underwater electric field dynamic measurement fluid noise interference cancellation device according to the present application;
FIG. 3 is a schematic diagram of a filtering circuit of an underwater electric field dynamic measurement fluid noise interference cancellation device provided by the application;
FIG. 4 is a schematic flow chart of a method for canceling noise interference of fluid in dynamic measurement of underwater electric field according to the present application;
FIG. 5 is a schematic diagram of an electric field sensor matrix distribution of an underwater electric field dynamic measurement fluid noise interference cancellation device provided by the application;
reference numerals in the drawings: 1. an electric field sensor a; 2. an electric field sensor b; 3. an electric field sensor c; 4. a signal conditioning module; 5. an acceleration measurement module; 6. and the speed measuring module.
Detailed Description
When the aircraft moves at a constant speed, direct-current voltage interference related to a speed V is generated between the electric field sensor matrixes according to an electromagnetic induction formula E=BLV; when the aircraft is in variable speed motion, alternating voltage interference related to acceleration can be generated between the electric field sensor matrixes.
In the process of measuring underwater ship, submarine and various underwater vehicles, etc., the DC voltage interference and AC voltage interference generated in the process of measuring underwater target electric field signals (including electrostatic fields and alternating electric fields) will both interfere the measurement result, and the interference will distort the spatial distribution characteristics of the measured target underwater electric field, so that the application needs to solve the problem by adopting the device and method for dynamically measuring fluid noise interference cancellation of underwater electric field.
The application provides a device and a method for canceling fluid noise interference in underwater electric field dynamic measurement, which are described in detail below with reference to the accompanying drawings and the embodiments.
Example 1
Referring to fig. 1 and 4, the application provides an underwater electric field dynamic measurement fluid noise interference cancellation device, which comprises an aircraft, an electric field sensor matrix, a speed measuring module and an acceleration measuring module, wherein the electric field sensor matrix, the speed measuring module and the acceleration measuring module are all arranged at the bottom of the aircraft, electric field signals are respectively measured by the electric field sensor matrix, speed signals of the aircraft are measured by the speed measuring module, and acceleration signals of the aircraft are measured by the acceleration measuring module.
In this embodiment, referring to fig. 5, the electric field sensor matrix is distributed at the bottom of the aircraft in an X-axis and Y-axis matrix, and the electric field sensor is mainly composed of a silver-silver chloride sensor or a carbon fiber sensor.
For example, an electric field sensor a and an electric field sensor b positioned in the X-axis direction are mounted on the aircraft, thereby forming an electric field sensor pair in the X-axis direction; the electric field sensor a and the electric field sensor c which are positioned in the Y-axis direction are arranged on the aircraft, so that an electric field sensor pair in the Y-axis direction is formed, and finally the electric field sensor a, the electric field sensor b and the electric field sensor c form an electric field sensor matrix, so that underwater electric field distribution in the two-axis direction of underwater X, Y can be measured.
In this embodiment, the speed measuring module is a universal underwater speed measuring device, which may be an electromagnetic speed measuring device, an inertial navigation device or an acoustic speed measuring device, and the measured speed is approximately equivalent to the relative speed between the aircraft and the sea water, that is, the relative speed of the sea water fluid between the electric field sensors, the corresponding relationship between the induced electromotive force and the relative speed is obtained by using the law of electromagnetic induction, and the corresponding relationship is expressed by using a transfer function, so that the analog voltage V corresponding to the relative speed can be given 1 。
In this embodiment, the acceleration speed measuring module is a capacitive accelerometer or a MEMS accelerometer, and is configured to measure a speed variation of an aircraft, and can provide an analog voltage V corresponding to an acceleration of the aircraft 2 。
Referring to fig. 1, the underwater electric field distribution device further comprises a signal conditioning module, wherein the signal conditioning module comprises a gain control circuit and a filter circuit which are coupled and connected, an electric field sensor matrix is electrically connected to a signal input end of the gain control circuit, and electric field signals measured by the electric field sensor are required to be processed by the signal conditioning circuit, so that more real underwater electric field distribution characteristics can be obtained;
the speed measuring module is electrically connected with the signal input end of the gain control circuit and is used for measuring the analog voltage V corresponding to the speed signal obtained by the speed measuring module 1 The input gain control circuit can offset direct-current voltage interference signals generated by the seawater fluid during constant-speed navigation, and the reliability of the acquired space distribution characteristics of the underwater electric field is ensured.
The acceleration measuring module is electrically connected with the signal input end of the filter circuit and is used for comparing the acceleration signalsAnalog voltage V of the application 2 The alternating current voltage interference signals generated by the sea water fluid during the speed changing navigation of the aircraft are filtered by controlling the notch frequency of the filtering circuit, so that the reliability of the acquired space distribution characteristics of the underwater electric field is ensured.
In this embodiment, referring to fig. 2, the gain control circuit is configured to output a gain control signal according to an input speed signal, and cancel dc voltage interference generated during constant speed navigation through the gain control signal, where the gain control circuit includes a gain amplifier and an inverting amplifier that are electrically connected.
The gain amplifier is an N2 voltage-controlled gain amplifier, the model is VCA810, the inverting input end of the N2 voltage-controlled gain amplifier is connected with the electric field signal input by the front stage, and the non-inverting input end of the N2 voltage-controlled gain amplifier is connected with the ground to amplify the electric field signal in an inverting way.
The inverting amplifier mainly comprises an operational amplifier (model OPA 698), an output resistor R3 and a feedback resistor R4, and the resistance values of the output resistor R3 and the feedback resistor R4 are equal, so that the gain of the inverting amplifier is-1 times, namely, only the inverting conversion is performed.
In addition, the inverting amplifier comprises an operational amplifier and is electrically connected with the operational amplifier at an output resistor R3 and a feedback resistor R4.
The gain adjustment of the N2 voltage controlled gain amplifier is connected with a gain control voltage which is an analog voltage V containing navigational speed information 1 After the inversion conversion, the gain of the whole gain control circuit is obtained after the voltage division by the voltage dividing resistor R1 and the voltage dividing resistor R2 is as follows:
；
wherein V is in Equivalent to V 1 。
It can be seen that V in The larger the amplification of the overall gain control circuit loop, the smaller.
Thus, an analog voltage V containing information on the speed of an underwater vehicle in Negative feedback is formed: the higher the navigational speed of the underwater vehicle, the more induced DC voltage is formed between the electric field sensorsLarge; while the higher the navigational speed is, the analog voltage V corresponding to the navigational speed of the aircraft is given 1 The larger the analog voltage signal V in Correspondingly, the larger the direct current amplification factor of the whole circuit loop is, the smaller the direct current amplification factor is, and thus, the inhibition and the offset effects on direct current voltage interference generated by underwater fluid are achieved.
In this embodiment, referring to fig. 3, the filtering circuit is a phase-locked tracking bandstop filtering circuit, and is configured to control a notch frequency according to an input acceleration signal, and filter alternating voltage interference generated during speed-changing navigation through the notch frequency, where the filtering circuit includes a limiting amplifier, a shaping circuit, a frequency doubling circuit, and a bandstop filter that are electrically connected.
More specifically, the phase-locked tracking band-stop filter circuit takes a switched capacitor filter (model is LTC 1068-50) as a core and is provided with a band-stop filter for automatically tracking an input signal, wherein the filtering frequency of the switched capacitor filter is as follows:
；
the switch capacitor filter and the peripheral resistor-capacitor component form a band-stop filter according to the structure of a typical circuit of a chip manual, and the center frequency of a stop band of the band-stop filter is one fiftieth of the frequency of a control clock signal.
The limiting amplifier mainly comprises an operational amplifier (model OPA 698) and a peripheral resistor, and after the acceleration signal enters the limiting amplifier, the limiting amplifier is amplified to full-amplitude output even though the acceleration signal is weak due to the extremely large closed loop gain of the limiting amplifier, and at the moment, the frequency information of the acceleration signal measured by the acceleration measuring module is extracted.
The shaping circuit mainly comprises a high-speed comparator (model LM 311) and a peripheral pull-up resistor R4, signals enter a positive input end of the high-speed comparator, and compared with a low level of a negative input end, the comparator turns over, the signals become more regular rectangular waves, shaping is achieved, at the moment, acceleration signals output by full amplitude of a front-stage limiting amplifier enter the shaping circuit and are shaped into regular square waves, and frequency information is kept.
The frequency doubling circuit mainly comprises a phase-locked loop (model 74HC 4046) and a counter (model 74HC 390), and after the square wave signal output by the shaping circuit enters the frequency doubling circuit, the frequency is improved by 50 times.
The acceleration signal sensed by the acceleration measuring module is amplified in a limiting way through a limiting amplifier and then shaped into square waves through a high-speed comparator, and then the frequency signal measured by the acceleration measuring module is extracted; the frequency multiplication circuit formed by phase-locked loop and counter can raise frequency signal by 50 times, and the filtering frequency of switch capacitor filter chip isThe central notch frequency of the stopband of the band-stop filter is automatically kept consistent with the frequency of the speed change of the aircraft measured by the acceleration measurement module, so that the notch frequency of the stopband always tracks the signal frequency of the acceleration measurement module, and alternating current voltage interference generated by the variable speed motion of the aircraft relative to the seawater fluid is filtered.
The application provides a fluid noise interference cancellation method and device for dynamic measurement of an underwater electric field, which are based on the following working principles: when the aircraft moves, electric field signals of underwater targets are received, the signals are processed by the signal conditioning module and then enter the post-stage data record, and direct-current voltage and alternating-current voltage interference signals can be generated due to relative movement of sea water fluid among electric field sensor matrixes.
Thus, the speed signal of the aircraft measured by the speed measuring module of the aircraft is converted into a control voltage (equivalent to the analog voltage V 1 ) The gain multiple of the gain control circuit of the signal conditioning module is reversely controlled to offset the direct-current voltage interference signal generated by the induced voltage of the seawater fluid.
Meanwhile, an acceleration signal of the aircraft is measured by an acceleration measurement module on the aircraft, after the acceleration frequency information is extracted by a phase-locked tracking filter, the interference signal band-stop filter of the frequency band acceleration is carried out, an alternating voltage interference signal is restrained, and finally, an electric field signal is subjected to gain adjustment and tracking band-stop filter, so that the direct current voltage interference signal and the alternating voltage interference signal are restrained, and the reliability of the acquired underwater electric field space distribution characteristic is ensured.
Example two
The application also discloses a fluid noise interference cancellation method for dynamic measurement of the underwater electric field, which is applied to the fluid noise interference cancellation device for dynamic measurement of the underwater electric field, and comprises the following steps:
generating an electric field signal from the electric field sensor matrix;
measuring the navigation speed of the underwater vehicle by a speed measuring module and generating a speed signal;
measuring the acceleration of the underwater vehicle by an acceleration measuring module and generating an acceleration signal;
the speed signal is input into a gain control circuit, the gain control circuit outputs a gain control signal, and direct-current voltage interference generated during constant-speed navigation is counteracted by the gain control signal;
the acceleration signal is input into a filter circuit, the notch frequency is output by the filter circuit, and the alternating voltage interference generated during speed changing navigation is filtered through the notch frequency.
The application also discloses a fluid noise interference cancellation method for dynamic measurement of the underwater electric field, which comprises the following specific principles: the speed signal of the aircraft, which is measured by the speed measuring module of the aircraft, is converted into a control voltage (equivalent to an analog voltage V1), and the gain multiple of the gain control circuit of the reverse control signal conditioning module is used for counteracting the direct-current voltage interference signal generated by the sea water fluid induced voltage.
Meanwhile, an acceleration signal of the aircraft is measured by an acceleration measurement module on the aircraft, after the acceleration frequency information is extracted by a phase-locked tracking filter, the interference signal band-stop filter of the frequency band acceleration is carried out, an alternating voltage interference signal is restrained, and finally, an electric field signal is subjected to gain adjustment and tracking band-stop filter, so that the direct current voltage interference signal and the alternating voltage interference signal are restrained, and the reliability of the acquired underwater electric field space distribution characteristic is ensured.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Those of ordinary skill in the art will appreciate that all or a portion of the steps of the various methods of the above embodiments may be implemented by hardware associated with a program that is stored in a computer-readable storage medium, including read-only memory (ROM), random-access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage, tape storage, or any other medium that is readable by a computer that can be used to carry or store data.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
Claims (7)
1. An underwater electric field dynamic measurement fluid noise interference cancellation device comprises an aircraft, an electric field sensor matrix, a speed measurement module and an acceleration measurement module, wherein the electric field sensor matrix, the speed measurement module and the acceleration measurement module are arranged on the aircraft, electric field signals are measured by the electric field sensor matrix, speed signals of the aircraft are measured by the speed measurement module, and acceleration signals of the aircraft are measured by the acceleration measurement module;
it is characterized in that the system also comprises a signal conditioning module, the signal conditioning module comprises a gain control circuit and a filter circuit which are coupled and connected, the electric field sensor matrix and the speed measuring module are electrically connected with the signal input end of the gain control circuit, the acceleration measuring module is electrically connected with the signal input end of the filter circuit,
the gain control circuit is used for outputting a gain control signal according to an input speed signal, and canceling direct-current voltage interference generated during constant-speed navigation through the gain control signal, and comprises a gain amplifier and an inverting amplifier which are electrically connected;
the filtering circuit is a phase-locked tracking band-stop filtering circuit and is used for controlling notch frequency according to an input acceleration signal, filtering alternating voltage interference generated during speed-changing navigation through the notch frequency, and the filtering circuit comprises a limiting amplifier, a shaping circuit, a frequency doubling circuit and a band-stop filter which are electrically connected;
the shaping circuit comprises a comparator and a pull-up resistor R4 which are electrically connected, and the frequency multiplication circuit is fifty times and comprises a phase-locked loop and a counter which are electrically connected.
2. The underwater electric field dynamic measurement fluid noise interference cancellation device of claim 1, wherein the electric field sensor matrix comprises electric field sensors arranged in an X-direction and in a Y-direction.
3. The device for dynamically measuring fluid noise interference cancellation of an underwater electric field according to claim 1, wherein the speed measuring module is an electromagnetic speed measuring module installed at the bottom of the aircraft.
4. The underwater electric field dynamic measurement fluid noise interference cancellation device of claim 1, wherein the acceleration measurement module is a capacitive accelerometer or a MEMS accelerometer mounted at the bottom of the aircraft.
5. The device of claim 1, wherein the inverting amplifier comprises an operational amplifier and is electrically connected to the operational amplifier at an output resistor R3 and a feedback resistor R4.
6. The underwater electric field dynamic measurement fluid noise interference cancellation device of claim 1, wherein the gain control circuit further comprises a divider resistor R1 and a divider resistor R2 electrically connected to the gain amplifier.
7. A method for canceling fluid noise interference in underwater electric field dynamic measurement, applied to an underwater electric field dynamic measurement fluid noise interference cancellation device as set forth in any one of claims 1 to 6, characterized in that the cancellation method comprises the steps of:
generating an electric field signal from the electric field sensor matrix;
measuring the navigation speed of the underwater vehicle by the speed measuring module and generating a speed signal;
measuring acceleration of the underwater vehicle by the acceleration measuring module and generating an acceleration signal;
inputting the speed signal into the gain control circuit, outputting a gain control signal by the gain control circuit, and counteracting direct-current voltage interference generated during constant-speed navigation through the gain control signal;
and inputting the acceleration signal into the filter circuit, outputting a notch frequency by the filter circuit, and filtering alternating voltage interference generated during variable speed navigation through the notch frequency.
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| CN219201859U (en) * | 2022-10-12 | 2023-06-16 | 北方工业大学 | Seawater fuel cell discharge service performance testing device |
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