32 results about "Fixed gain" patented technology

The invention discloses an IMU attitude calculation method, device and equipment and a storage medium, and the method comprises the steps: obtaining IMU original data which comprises a three-axis acceleration measurement value and a three-axis angular velocity measurement value; dynamically updating gain parameters of a Mahony complementary filtering algorithm based on the three-axis acceleration measurement value, the gain parameters including a proportional gain parameter and an integral gain parameter; based on the gain parameter, correcting the triaxial angular velocity measurement value to obtain a target triaxial angular velocity value; and calculating body attitude information based on the three-axis acceleration measurement value and the target three-axis angular velocity value. Compared with a traditional Mahony algorithm adopting fixed gain parameters, the method can reduce error fluctuation of the airframe under rapid movement and improve the accuracy of attitude calculation.

The invention belongs to the technical field of radio frequency amplification circuits, and particularly discloses a short-wave receiving amplification circuit capable of realizing cascade transmission and a short-wave communication system. According to the invention, direct current and interference in a previous-level signal are filtered through the filtering module, a pure radio frequency signal is obtained, and a foundation is laid for subsequent processing; the signal strength is improved through the amplification module, and single-stage transmission attenuation is overcome; the key point is that the balance gain module applies gain processing which is compensated for the loss characteristic of a transmission link to the amplified signal, so that the signal strength can be accurately matched with the actual loss of the line, and the problem that a fixed gain mode cannot adapt to the multi-stage series accumulated loss is solved. Compared with the prior art, the scheme realizes stable cascade transmission of short-wave signals through cooperative work of the modules, and remarkably improves the transmission distance and reliability of the system through dynamic compensation accumulated loss.

A control method of an optical transceiver having a transmission port, a reception port, and a light source for transmission and reception of an optical signal, includes: determining whether a state of a connection of a transmission path to the reception port is a loopback connection from the transmission port; and switching a control of a gain of the reception from an automatic gain control (AGC) to a fixed gain when determining the state of the connection to be the loopback connection.

The signal dynamic gain control system provided by this invention constructs an adaptive gain adjustment path through a first operational amplifier circuit and a feedback control circuit. This allows for real-time adjustment of the pre-amplification factor based on the signal strength at the front end of the analog-to-digital converter, avoiding signal overload caused by fixed gain and improving the system's adaptability to dynamic audio input. Furthermore, a comparison circuit composed of a voltage comparator and a programmable reference voltage source enables real-time judgment of high and low level logic signals, facilitating the construction of a control feedback link with a response time in the microsecond range and enhancing the system's protection sensitivity.

A variable gain amplifier for amplifying an input voltage and providing an amplified output voltage includes an input stage including two differential transistor pairs, the input stage coupled to an input of the amplifier. The variable gain amplifier also includes an output stage including a transistor quad and an additional transistor pair, the output stage coupled to an output of the amplifier, the transistor quad including a terminal for receiving a gain control. The variable gain amplifier also includes coupling outputs of the two differential transistor pairs of the input stage to inputs of the transistor quad and additional transistor pair of the output stage to provide a variable gain path and a fixed gain path, respectively. The variable gain amplifier exhibits improved dynamic range of gain variability, lower complexity, and better noise performance.

An equalizer includes a graphic equalizer circuit, a first multiplication circuit, a second multiplication circuit, a summing circuit, and a gain control circuit. The graphic equalizer circuit processes a first input signal and outputs a first output signal and a second output signal. The first multiplication circuit multiplies the first output signal by one of an adjustable gain value and a fixed gain value to produce a first adjusted output signal. The second multiplication circuit multiplies the second output signal by the other of the adjustable gain value and the fixed gain value to produce a second adjusted output signal. The summing circuit combines the first adjusted output signal and the second adjusted output signal to produce an equalizer output signal. The gain control circuit dynamically adjusts the adjustable gain value based on the equalizer output signal.

The invention is suitable for the technical field of automation control, and provides a follow-up control method, device and equipment and a storage medium, the method comprises the steps that the actual height between a machining head and a plate is obtained, and the current error and the error change rate between the actual height and the preset target height are determined; performing fuzzification processing on the current error and the error change rate to obtain an error membership degree and a change rate membership degree; according to a preset fuzzy rule table, performing fuzzy reasoning on the error membership degree and the change rate membership degree to obtain a proportion-integration-differentiation (PID) gain membership degree; performing defuzzification processing on the gain membership degree to obtain a PID gain increment; and carrying out superposition processing on the gain increment and the PID fixed gain to generate an adjusted control signal. According to the follow-up control method provided by the embodiment of the invention, the PID gain can be adaptively adjusted so as to cope with follow-up control under complex working conditions, and overshoot or insufficient follow-up response is avoided.

The application discloses a self-adaptive fiber-optic F-P sensor demodulation device and a working method thereof, a tunable wavelength light source, a photoelectric detector, a low-pass filter, a high-pass fixed gain amplifier, a high-pass continuous variable gain amplifier and a controller. The demodulation device is based on a stable working point method, scans the tunable wavelength light source, detects an interference curve of the F-P sensor, thereby obtaining a phase sensitivity of the F-P sensor, and adjusts the high-pass continuous variable gain amplifier, so that the output analog signal has a determined phase sensitivity relationship. The application has the characteristics that the F-P sensor with inconsistent parameters can be automatically adapted, the output phase sensitivity or vibration displacement sensitivity coefficient is stable, the application is suitable for low-precision and high-precision F-P sensors, has real-time analog signal output, and is convenient for being integrated as a module.

The invention relates to the field of control, in particular to a multi-sensor data fusion slip form construction closed-loop control method and system, and the method comprises the steps: collecting the pressure and displacement data of each jacking fulcrum of a slip form device in real time; calculating a pressure compensation weight coefficient of the absolute value of the sliding mode variable in the previous period through an exponential attenuation function, weighting a pressure mean value and a reference pressure difference, multiplying the weighted pressure mean value and reference pressure difference by a pressure-displacement conversion coefficient to obtain an equivalent displacement compensation amount, adding the two values to obtain a comprehensive deviation, constructing a sliding mode surface function, and calculating the sliding mode variable; calculating a second norm of the time change rate of the pressure data, and determining the actual boundary layer thickness; the sliding mode control law comprises an equivalent part and a switching control part, when the absolute value of a sliding mode variable is larger than the thickness of a boundary layer, switching control is a fixed gain sign function, otherwise, switching control is a proportional term, and a global jacking speed reference instruction is generated; according to the difference value between the real-time pressure of each fulcrum and the pressure mean value, the speed differential adjusting amount is calculated through proportional-integral adjustment, and the speed differential adjusting amount and the global reference instruction are superposed to obtain the jacking speed control instruction of each fulcrum.

This invention belongs to the field of industrial automation control technology, specifically relating to a feeding control method and system for a synthesis reactor. The method includes: real-time acquisition of the reactor's internal temperature; calculation of instantaneous deviation and deviation change rate; deriving a proportional scale and nominal rate based on the base gain and the device's output range; obtaining a nonlinear proportional gain by combining the instantaneous deviation and the proportional scale; determining the phase relationship by combining the instantaneous deviation, deviation change rate, and nominal rate to obtain the integral weight; obtaining a dynamic differential gain by combining the deviation change rate and nominal rate; and combining the three adaptive gains to calculate the proportional, integral, and differential terms respectively, and adding them together to obtain the final control output. This invention solves the temperature overshoot and oscillation problems caused by fixed gain and integral lag in traditional PID control.

The utility model discloses a kind of opto-coupler isolation amplification circuits, including first voltage stabilizing circuit, first amplifier circuit, second amplifier circuit, the input end of first voltage stabilizing circuit is used to obtain input signal, the output end of first voltage stabilizing circuit is connected the input end of first amplifier circuit, the output end of first amplifier circuit is connected the input end of second amplifier circuit, the output end of second amplifier circuit is used to output isolated amplification signal;First amplifier circuit is used to the input signal of first voltage stabilizing circuit output is amplified after opto-coupler isolation according to preset first amplification multiple, obtains first amplification signal;Second amplifier circuit is used to first amplification signal is amplified according to preset second amplification multiple, obtains isolated amplification signal.Solved the isolation chip of special use in traditional isolation circuit, this type of isolation chip has fixed gain multiple, signal isolation after output signal amplitude adjustment circuit is relatively complex, leading to the problem of higher cost of existing isolation circuit.

The application discloses a kind of multi-agent system fault-tolerant control methods under actuator failure, first construct the linear multi-agent system mathematical model of introducing actuator multiplicative fault and additive fault to describe the influence of actuator failure on control input, based on the communication topological relationship of system, construct a consistent error dynamic equation, for describing the change of each agent state error with time, finally design fixed gain fault-tolerant controller based on the multi-agent system mathematical model, realize multi-agent system fault-tolerant control.The method of the application has the advantages of simple controller structure, strong adaptability, low implementation cost, high communication efficiency, etc., can be widely applied to unmanned aerial vehicle formation, robot cooperation, sensor network and other multi-agent system fault-tolerant control scene, has good engineering application value and popularization prospect.

This invention relates to the field of permanent magnet synchronous motor (PMSM) technology, specifically a time-delay control method, system, and medium for PMSLM motors based on adaptive gain dynamics. A dynamic order model of the PMSLM motor position-current dual closed-loop system is established, the position tracking error is defined, and the position error dynamic equation is derived. The desired position tracking error dynamics are designed, and the equivalent control law for time delay is solved based on the equivalent control concept. The system lumped uncertainty is estimated and filtered online using a time delay estimation method, achieving effective compensation for parameter uncertainties, external disturbances, and unmodeled dynamics, resulting in a time delay control law under fixed gain. Adaptive gain dynamics based on Lyapus stability analysis is introduced to achieve online adaptive adjustment of the control gain. This invention realizes servo control and optimization of PMSLM motors based on adaptive gain dynamics, significantly improving the motor's position tracking accuracy, robustness, and adaptability to different operating conditions.

The application relates to the technical field of ultrasonic thickness measurement, in particular to a thickness measurement method based on electromagnetic ultrasonic signals. First, an echo signal of a measured object is acquired through an electromagnetic ultrasonic transducer; then, the echo signal is sequentially subjected to fixed gain amplification, primary band pass filtering, adjustable gain amplification and secondary band pass filtering to obtain a filtered signal; subsequently, the signal-to-noise ratio of the filtered signal is calculated, and a corresponding processing strategy is selected according to the signal-to-noise ratio; finally, the initial thickness is calculated according to the peak value interval and the ultrasonic wave speed, the average thickness is obtained after averaging, and the final thickness is obtained through relative standard deviation verification, so that the thickness measurement precision is effectively improved.

The invention provides a digital automatic gain system and a control method thereof. The digital automatic gain system comprises a digital control attenuator, a gain switching circuit and a fixed gain circuit which are sequentially connected in series, the output end of the fixed gain circuit is also provided with a directional coupler, and further comprises a detector and a control unit; the directional coupler couples one path of signal; after the signal is detected by the detector, the result is sent to the control unit; and the control unit assigns the numerical control attenuator and the gain switching circuit according to the detection result of the detector so as to realize the stability of the gain output by the digital automatic gain system. The control method comprises the steps of initial value setting, detection voltage judgment, required attenuation calculation, attenuation setting scheme judgment, attenuator and amplifier state value output and the like. According to the invention, the system and the method for fast automatic gain control in a wide range are realized, and the target gain is accurately set through at most five-step calculation and judgment. The scheme has the advantages of simplicity and reliability.

The invention relates to the technical field of wireless communication and electronic circuits, in particular to a multi-channel receiver and an automatic gain control method, and the control method comprises the steps: obtaining an energy value of a current receiving signal of each receiving channel; calculating a target total gain value required by each receiving channel at the next moment according to the energy value; comparing the target total gain value of each channel with a preset fixed gain value of a low noise amplifier; and controlling the opening or closing state of the low-noise amplifier according to the comparison result, and independently adjusting the gain value of the variable gain amplifier in each receiving channel based on the state of the low-noise amplifier. According to the scheme of the invention, the cost and the size of the multi-channel receiver are effectively reduced, intelligent saturation prevention can be realized, and the stability of signal receiving is effectively improved.

The application discloses a current sampling circuit of a power tube, comprising: a sampling resistor connected with the power tube; a voltage amplification circuit comprising a first input end and a second output end connected with two ends of the sampling resistor respectively, the voltage amplification circuit being used for amplifying the voltage between the two ends of the sampling resistor and outputting the amplified voltage through the first output end and the second output end; a feedback output circuit connected with the first output end and the second output end of the voltage amplification circuit, the feedback output circuit outputting a sampling current representing the current flowing through the power tube by making the voltage of the first output end equal to the voltage of the second output end; and a current bias circuit comprising a first resistor, used for providing a bias current to the voltage amplification circuit according to the first resistor, so that the voltage amplification circuit has a fixed gain with high precision and without change with process corner.

This application discloses a current-sensing amplifier circuit and calibration method, including: an input module, a reference voltage module, an amplifier, a feedback module, a first switch, and a second switch; the input module and the first switch are sequentially connected to the non-inverting input terminal of the amplifier; the input module and the second switch are sequentially connected to the inverting input terminal of the amplifier; the input module is used to switch between providing a non-zero detection voltage or a zero detection voltage to the amplifier; the inverting input terminal of the amplifier is also connected to the output terminal of the amplifier through the feedback module; the reference voltage module is connected in parallel with the first switch, and the reference voltage module is used to switch between directly outputting the reference voltage or outputting the reference voltage by voltage division; the feedback module is used to switch between providing unity gain or fixed gain to the amplifier. The embodiments of this application can accurately calibrate the detection voltage.

The invention discloses a wireless passive sensing system and method based on adaptive gain. The wireless passive sensing system comprises a reading resonator and two sensing resonators. The read resonator includes a capacitor, an inductor, and a negative resistor. Each of the two sensing resonators comprises a capacitor, an inductor and a resistor. The natural frequencies of the two sensing resonators are kept symmetrically offset relative to the natural frequency of the reading resonator. By adding disturbance to any resistor in the two sensing resonators, a driving system is expanded to EP5, and the sensitivity in the sensing process is improved. Meanwhile, a vector network analyzer or an impedance analyzer is used as a negative resistor, and a zero crossing point of an input impedance imaginary part or a reflection coefficient imaginary part is used as an eigen frequency criterion in frequency scanning, so that a traditional'fixed gain-scattering extreme value 'is converted into a new measurement form of'impedance imaginary part zero crossing point-eigen frequency direct reading'.

The invention discloses a nonlinear self-adaptive PID tracking control method suitable for complex electromechanical systems such as a mechanical arm. According to the method, nonlinear proportion, integral and differential modulation functions are introduced, and the linear limitation of traditional PID is broken through; smooth transition between a fixed gain linear PID and a nonlinear PID can be realized through parameter adjustment. An integral modulation function adopts a bounded or self-disappearance form, so that the problems of integral saturation and overshoot are effectively suppressed; the designed self-adaptive single-parameter setting mechanism can avoid the defect of repeated trial and error of parameters depending on artificial experience in traditional PID control, and the debugging difficulty and the engineering cost are remarkably reduced. The method can realize asymptotic tracking and guarantee bounded comprehensive performance indexes in the presence of modeling uncertainty and external disturbance, has the advantages of high robustness, simplicity in implementation and wide application range, and is suitable for various application scenes such as industrial mechanical arms, service robots and picking mechanical arms.

The invention provides a motion control method and device for mechanical equipment, and is applied to a controller of a control system. Firstly, actual position information, detected by a sensor, of the mechanical equipment is obtained, and then position deviation information of the mechanical equipment is obtained based on the actual position information. Then, a pre-configured fixed gain coefficient of the controller is obtained, and the fixed gain coefficient comprises a fixed proportion scheduling coefficient; and then, determining a sliding mode surface based on the position offset information and a fixed proportion scheduling coefficient. And then, determining a dynamic differential scheduling coefficient of the controller according to the sliding mode surface. And finally, processing the position offset information by adopting a fixed gain coefficient and a dynamic differential scheduling coefficient to obtain controller output information, outputting the controller output information to an actuator, and controlling the movement of the mechanical equipment through the actuator. According to the scheme, the differential gain item of the controller is dynamically adjusted through the sliding mode surface to enhance the damping of the mechanical equipment, and the residual vibration phenomenon after the mechanical equipment moves can be effectively inhibited.

The present application relates to permanent magnet synchronous motor technology field, especially the PMSLM motor time delay control method, system and medium based on adaptive gain power, the dynamics order model of the position-current double closed loop system of PMSLM motor is established, the position tracking error is defined and the position error dynamics equation is derived, the expected position tracking error dynamics is designed, and the time delay equivalent control law is solved based on the equivalent control idea, the system lumped uncertainty is estimated and filtered on line by using time delay estimation method, the effective compensation of parameter uncertainty, external disturbance and unmodeled dynamic is realized, and the time delay control law under fixed gain is obtained, the adaptive gain dynamics based on Lyapunov stability analysis is introduced, and the on-line adaptive adjustment of control gain is realized.The present application realizes the adaptive gain dynamics PMSLM motor servo control and optimization, and significantly improves the position tracking accuracy, robustness and working condition adaptability of the motor.

The invention belongs to the technical field of broadband underwater acoustic signal acquisition and processing, and particularly relates to a multichannel broadband sonar signal conditioning circuit based on a programmable filter. Comprising a fixed gain preamplifier; an adjustable high-pass filter; an adjustable low-pass filter; an emitter follower amplifier; the programmable gain amplifier is connected with the output end of the emitter follower amplifier; the gain control unit is used for carrying out accurate gain control on the filtered signal, and the gain value is set by the micro-control unit through a digital communication interface SPI, so that the signal amplitude is adjusted to an optimal quantization interval; the differential amplifier is connected with the output end of the programmable gain amplifier; the analog-to-digital converter is used for converting an analog signal into a high-resolution digital signal; and the synchronous clock circuit is used for providing a homologous clock signal for the band-pass filter. The invention aims to solve the problems of poor flexibility, low multi-channel consistency, complex system, high cost and the like in the existing sonar signal conditioning technology.

The invention discloses an audio signal compensation method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out the framing and frequency division of an original audio signal, calculating the frequency band energy ratio of each sub-band signal, and determining the target gain of each sub-band signal through the frequency band energy ratio of each sub-band signal, and inputting the target gain into the filter of each sub-band for gain compensation to obtain a gain-compensated target audio signal, and determining the target gain of each sub-band signal through the band energy ratio of each sub-band signal compared with the mode of performing compensation processing on the audio signal by adopting a fixed gain parameter. According to the invention, dynamic gain compensation can be realized according to energy of different frequency bands in the audio signal, the compensation mode is more flexible, at least one sub-frequency band where human voice and musical instrument sound are located can be selected for targeted compensation, the human voice and the musical instrument sound are more prominent when the compensated audio signal is played, and the audition feeling effect of the audio is improved.

This invention discloses an automatic adjustment control method, system, device, and storage medium for coaxial video signals, comprising the following steps: acquiring an analog coaxial video signal; adjusting the amplitude of a set frequency signal therein so that its gain can be controlled by control parameters to obtain an adjusted analog coaxial video signal; converting the adjusted analog coaxial video signal into a discrete digital coaxial video signal; and extracting a reference level value from the digital coaxial video signal according to the quadrature modulation signal demodulation principle. Beneficial effects: It can match the actual attenuation degree of the coaxial video signal under different transmission distances and cable losses without manual intervention, completely solving the signal problems caused by insufficient or excessive compensation in existing fixed gain schemes, accurately offsetting the amplitude attenuation of high-frequency signals caused by long-distance transmission, and ensuring the brightness edge sharpness and color stability of the decoded video image.

The invention discloses a measurement and control system for electron multiplier acceleration testing, and belongs to the field of electron multiplier service life testing. The system comprises a vacuum system, an electronic gun servo module, a program control high-voltage source, an electrometer, a universal meter and a computer measurement and control program. The system adopts a modular design, and the vacuum system provides an electron multiplier test vacuum degree and an electron gun working vacuum degree; the electron gun servo module comprises an electron gun current source and an electron gun potential servo module and is used for accurately controlling the size of an incident electron beam current of the electron multiplier; the program-controlled high-voltage source can be controlled by a computer program and provides working voltage for the multiplier, and the multiplier is externally connected with a divider resistor port and a current collecting port. The electrometer and the universal meter are used for collecting data. The computer control software is written by MATLAB language and has a graphical interface. After the output of the current source and the potential of the electron gun are fixed, a control program controls the output voltage of the program-controlled high-voltage source through a serial port by collecting the output current of the multiplier, so that the multiplier is ensured to work in a fixed gain mode. The incident current is controlled to be at a relatively large value, and the total output charge number when the multiplier fails can be obtained through an acceleration test in a fixed gain mode.

In some implementations, an optical amplifier system includes a variable gain optical amplifier that is an erbium doped fiber amplifier. The variable gain optical amplifier may provide a first gain stage for an optical signal. The optical amplifier system may include a fixed gain optical amplifier that is an erbium-ytterbium doped fiber amplifier. The fixed gain optical amplifier may provide a second gain stage for the optical signal following the first gain stage.

The application relates to the technical field of laser measurement, and discloses an aluminum alloy door and window size laser measurement device which comprises a rack, a laser detector, a conveyor and a gain multiple regulation system. The gain multiple regulation system is integrated with an environmental context module, a target characteristic module, a core feedback module, a signal quality module and a dynamic stability module. According to multi-dimensional parameters such as target distance, environmental light intensity, target surface reflectivity, laser incidence angle and received signal strength, the gain multiple of a laser receiving module is output and dynamically adjusted through an environmental model, a geometric optical compensation model, a constraint automatic gain control model, a signal form diagnosis model and a smooth filtering and dynamic response model. The application solves the problems of signal saturation or measurement failure caused by the fact that the existing laser measurement device cannot adapt to complex working conditions due to a fixed gain strategy, and realizes high-precision and high-stability self-adaptive measurement of the size of aluminum alloy doors and windows under various environments and target characteristics.

The application relates to a transducer matching optimization program algorithm for an NB remote transmission ultrasonic gas meter, wherein the method comprises continuously sampling measurement data in the gas meter in a sampling period to obtain a sampling data set; a first sound velocity estimation value is obtained according to a forward flow propagation time and a reverse flow propagation time; a preliminary screening sub-database is obtained based on all the first sound velocity estimation values; a matching flow medium corresponding to a target flow medium is determined in the preliminary screening sub-database according to the first sound velocity estimation value; an initial working parameter group in the transducer is determined in a flow medium acoustic parameter database according to the matching flow medium; the initial working parameter group is adaptively corrected according to the first sound velocity estimation value to obtain a recommended working parameter group; a control instruction is generated based on the recommended working parameter group, and the control instruction is sent to the transducer. Compared with a fixed gain mode, the method can adaptively match various gas media, and the application range of the ultrasonic gas meter is significantly expanded.

A phase-locked loop (PLL) circuit includes a voltage-controlled oscillator configured to generate an output clock signal of the PLL circuit, a phase detector configured to generate a phase error signal representing a phase difference between a first clock signal based on a reference clock signal and a second clock signal based on the output clock signal, a comparator configured to generate a phase error sign signal based on a reference voltage and the phase error signal, and a reference voltage generation circuit configured to scale first and second sign values of the phase error sign signal based on a fixed gain value and a variable gain value, respectively, and generate the reference voltage based on the scaled first and second sign values.