90 results about "Signal cancellation" patented technology

The invention relates to the technical field of power system relay protection, and discloses a relay protection device mutual inductor adjustment system and method, and the system comprises a system connection initialization module, a data collection reference data generation module, a power frequency background signal offset module, a pilot frequency current injection error calibration module, and a calibration result verification output module. The method comprises the following steps: initializing sampling frequency of a to-be-calibrated mutual inductor and calibration source output precision of a calibration system, collecting amplitude and phase data of real-time power frequency current of the mutual inductor, generating offset current with equal amplitude and opposite directions through power electronic compensation based on reference data, optimizing offset current parameters through a closed-loop adjustment algorithm, and adjusting the offset current parameters through a closed-loop adjustment algorithm. Power frequency background signal offset is completed, pilot frequency calibration parameters are set, a difference value between a mutual inductor pilot frequency output signal and a calibration source standard signal is extracted by adopting a zero pointing technology, an optimal calibration coefficient is automatically calculated, verification of a calibration result is completed, and accuracy and reliability of the calibration result are ensured.

The invention discloses a domestic high-power IGBT rectification system and method, and relates to the technical field of IGBT rectification, and the method comprises the steps: constructing an active front-end rectification main circuit; a direct current side hybrid harmonic modulation auxiliary circuit is integrated; performing multiple delay signal elimination operation on the sampled signal, filtering out a harmonic interference signal, and locking the frequency and phase of the fundamental voltage of the power grid through a phase-locked loop; establishing a control structure of a voltage outer loop and a current inner loop, generating an instruction amplitude of a grid-side active current and an ideal sinusoidal current reference waveform, and controlling an IGBT in an active front-end rectification main circuit in real time; real-time fast Fourier transform analysis is carried out on the actual input current of the grid side, and residual harmonic components are identified; and feedback management of regenerated energy is realized. The invention provides a fused high-adaptability active front-end IGBT (Insulated Gate Bipolar Translator) rectification method and system which can stably operate under the condition of power grid voltage distortion and realize deep harmonic suppression and efficient energy bidirectional flow.

The invention discloses a wide-frequency three-phase phase-locked loop method, which relates to the technical field of three-phase phase-locked loops and comprises an alternating-current signal acquisition and coordinate transformation unit, a double-reduced-order generalized integrator, a frequency-locked loop frequency estimation unit, a double-second-order generalized integrator, a parallel delay signal cancellation filtering module and a phase-locked loop phase estimation unit. A three-phase power grid voltage signal is input into the alternating current signal acquisition and coordinate conversion unit to obtain a two-phase voltage under a static coordinate system; the double-reduced-order generalized integrator and frequency-locked loop frequency estimation unit outputs a three-phase power grid frequency estimation value and carries out feedforward; and the bisecond-order generalized integrator outputs a three-phase power grid positive sequence component, inputs the three-phase power grid positive sequence component into the parallel delay signal cancellation filtering module to filter out a higher harmonic component, and then inputs the three-phase power grid positive sequence component into the phase-locked loop phase estimation unit to output a three-phase power grid phase estimation value. The method can effectively solve the problem that a traditional phase-locked loop is difficult to lock the phase quickly and accurately when the ship microgrid frequency fluctuates in a large range, and improves the phase-locking precision and dynamic performance.

The invention discloses a frequency-locked loop of a self-adaptive delay signal elimination filter, which comprises a first filter, a second filter, a Park transformation module, a low-pass filter, an amplitude normalization module, an inverse Park transformation module, a frequency estimation module and a low-pass filter, and is characterized in that the first filter is used for eliminating higher harmonics, the second filter is used for eliminating low-order single harmonics, and the amplitude normalization module is used for normalizing the amplitude of the inverse Park transformation module. A signal passing through the filter is converted into a direct current component under a dq coordinate system through the Park conversion module, high-frequency clutter is filtered out through the low-pass filter, then the signal enters the amplitude normalization module, the signal amplitude is standardized to be 1, the signal is recovered into an alternating current signal through the reverse Park conversion module, the alternating current signal is input into the frequency estimation module, and the frequency estimation module estimates the frequency of the signal. And finally, a stable power grid frequency estimation value is obtained after processing by a low-pass filter. The invention aims to eliminate rounding errors and introduce a novel prefilter with relatively small time delay, so that the dynamic and steady-state performance of the first-order frequency-locked loop is improved.

This application discloses a method and system for online condition assessment of permanent magnet motors based on multi-scale fuzzy entropy, relating to the technical field of permanent magnet motor fault diagnosis and reliability index analysis. It solves the technical problems of existing technologies that often rely on macroscopic parameters such as failure rate, making it difficult to quantify the degree of motor performance degradation and lacking consideration for real-time online condition assessment of permanent magnet motors, resulting in low accuracy and real-time performance of permanent magnet motor condition assessment. The method generates a radial air gap magnetic flux density difference signal based on the radial air gap magnetic flux density signal, and uses this to generate a multi-scale fuzzy entropy and a permanent magnet demagnetization assessment model. It generates the permanent magnet condition result based on the multi-scale fuzzy entropy corresponding to the online radial air gap magnetic flux density signal, and eliminates magnetic flux density background interference through the radial air gap magnetic flux density difference signal. By characterizing the subtle differences in signal complexity under different demagnetization states through multi-scale fuzzy entropy, it achieves a quantitative description of the degree of permanent magnet degradation, improving the real-time performance and accuracy of condition assessment.

The application relates to the technical field of general control or regulation systems, and discloses an automatic regulation method for a plug taking pump operation, which comprises the following steps: synchronously acquiring a voltage vector and a current vector of a controlled execution unit; calculating a transient active power by calculating a scalar product of the voltage vector and the current vector; removing a steady power consumption component in the transient active power to extract an energy recoil pulse; generating a micro-elastic recoil energy product representing load yield information by integration; monitoring a differential gradient of the micro-elastic recoil energy product; and determining an output negative gradient duty cycle signal at a collapse moment to regulate a power slope. The application uses a vector power analysis mechanism to capture a load fragmentation signal, eliminates hydraulic hysteresis of a control loop, ensures that a negative pressure release rate of a pipeline matches a load displacement increment, and improves regulation accuracy under a load impedance step working condition.

The embodiment of the invention discloses a vehicle parking method, a parking control system and a domain controller, the method comprises the steps that the domain controller of a vehicle detects whether the distance between the vehicle and a parking point is smaller than a preset first distance or not, if yes, a pull-in mode enable signal is generated and sent to a chassis control unit, and if not, the chassis control unit controls the vehicle to stop; and the domain controller responds to a reflector signal output when the photoelectric sensor detects the positioning reflector installed at the parking point, generates the jump trigger signal and sends the jump trigger signal to the chassis control unit, so that the chassis control unit controls the vehicle to perform emergency braking and completes parking. According to the method, sensor signals are directly processed through the chassis bottom layer, calculation time consumption and communication delay of an upper-layer system are eliminated, and the effect of accurate parking is achieved. Moreover, when the distance between the vehicle and the parking point is smaller than the preset first distance, the chassis control unit is activated to receive the jump triggering signal, false triggering caused by other reflective objects is effectively avoided, and the system safety is improved.

The application provides a multi-excitation vibrator vibration test control method, device, terminal and medium, the method comprises the following steps: obtaining a multi-channel white noise signal and a multi-channel output signal, and obtaining an adaptive inverse matrix according to the multi-channel white noise signal and the multi-channel output signal; the driving signal of the current frame is applied to the test piece through the excitation vibrator, and the test piece response signal is obtained; the dynamic target phase is obtained according to the test piece response signal; the driving signal of the next frame is obtained according to the dynamic target phase, the test piece response signal, the driving signal of the current frame and the adaptive inverse matrix, and the test piece is controlled according to the driving signal of the next frame through the excitation vibrator, and the test piece response signal of the next frame is obtained. The inter-channel antagonistic effect is eliminated, the error is efficiently eliminated, the number of iterations required to reach the target spectrum tolerance band is shortened, and the control convergence speed is improved.

The invention belongs to the technical field of petroleum well logging, and discloses a method for eliminating array induction direct coupling signals, which comprises the following steps of: calibrating the unit thickness change of an adjusting piece and the quantitative contribution of each receiving coil direct coupling signal through electromagnetic simulation modeling and an underground environment equivalent experiment; the target thickness is solved and replaced through a linear correction model, closed-loop calibration is matched to enable a direct coupling signal to approach a preset threshold value, based on array induction logging, an existing three-coil system structure is difficult to thoroughly offset the direct coupling signal due to machining errors, useful signal extraction is seriously disturbed, the method does not need to modify a core structure of an instrument, operation is easy and convenient, adaptability is high, and the method is suitable for large-scale popularization and application. Direct coupling signals are eliminated accurately and thoroughly, the measurement accuracy of the stratum conductivity is effectively improved, and reliable data support is provided for oil and gas reservoir identification and evaluation.

This application discloses a signal cancellation circuit, a signal cancellation method, and an interface circuit. The signal cancellation circuit is applied to a full-duplex transmit / receive circuit, which includes a transmitter and a receiver. The transmitter provides a first-channel differential signal to the communication link based on an input signal, and the receiver receives a second-channel differential signal through the communication link. The signal cancellation circuit includes: a signal suppression unit connected to the differential input terminal of the receiver, used to provide a reverse-suppressed differential signal to the differential input terminal of the receiver based on the input signal; and a residual calibration unit, used to obtain the residual signal between the first-channel differential signal and the reverse-suppressed differential signal during the calibration phase, and to adjust the amplitude of the reverse-suppressed differential signal based on the offset characteristic value of the residual signal. By adjusting the reverse-suppressed differential signal, communication quality can be improved.

The invention discloses a multi-source LEO signal detection method and device, equipment and a storage medium. When the method provided by the embodiment of the invention is executed, the opportunity signals of the multi-source near-earth orbit LEO satellites can be obtained to obtain the mixed LEO signals, and the satellite signal with the strongest power component is identified from the mixed LEO signals through the GLR method to serve as the target LEO signal. And constructing an orthogonal projection matrix of the target LEO signal, and performing signal elimination on the mixed LEO signal by using the orthogonal projection matrix to obtain a new mixed LEO signal. And repeating the steps of identifying the signal with the strongest power component, constructing the orthogonal projection matrix and eliminating the signal until the latest mixed LEO signal is identified to have no effective satellite signal, and obtaining a plurality of target LEO signals. According to the invention, weak signals in the multi-source LEO signals can be effectively identified and separated, and the accuracy and integrity of signal detection are improved.

An amplifier (700) includes a common emitter stage coupled to a first input (720) and a second input (725), a common base stage coupled to the common emitter stage and a first output (730) and a second output (735), and a cancellation path coupled to the common emitter stage and the common base stage and the first output and the second output. The cancellation path generates a first cancellation signal 180 degrees out of phase with a first leakage signal at the first output and a second cancellation signal 180 degrees out of phase with a second leakage signal at the second output. The cancellation path includes a first cancellation transistor (M6) coupled to the common emitter stage and the common base stage and the first output and a second cancellation transistor (M5) coupled to the common emitter stage and the common base stage and the second output.

This application discloses a method for measuring instantaneous engine speed. The engine is equipped with a flywheel and a speed sensor. The flywheel has signal holes evenly distributed around its circumference, and also has missing hole positions. The speed sensor collects the sensing signals triggered by the signal holes during rotation. The method includes the following steps: Step 1: Obtain the interval angle between adjacent signal holes around the circumference of the flywheel; Step 2: During flywheel rotation, acquire and store the sensing signals using an oscilloscope to obtain the correspondence between the sensing signals and time; Step 3: Eliminate the offset of the sensing signals; Step 4: Obtain the positive and negative critical voltage values ​​and corresponding sampling times of the voltages adjacent to the falling edge of the sensing signals; Step 5: Obtain the time corresponding to 0 potential using interpolation; Step 6: Calculate the instantaneous speed based on the time difference between adjacent 0 potentials and the angle between the corresponding signal holes of the flywheel, and arrange the instantaneous speeds in chronological order to obtain a more accurate correspondence between instantaneous speed and time.

The application discloses a kind of high-power IGBT rectifying system and method, it is related to the technical field of IGBT rectification, including active front-end rectification main circuit is constructed;Integrated dc side hybrid harmonic modulation auxiliary circuit;Multiple delay signal elimination operation is carried out to the signal obtained by sampling, filter harmonic interference signal, the frequency and phase of grid fundamental voltage are locked by phase-locked loop;Establish the control structure of voltage outer loop and current inner loop, generate the instruction amplitude of net side active current and ideal sine current reference waveform, and real-time control IGBT in active front-end rectification main circuit;Actual input current of net side is analyzed in real time by fast fourier transform, and residual harmonic component is identified;Realize the feedback management of regenerative energy.The application proposes a kind of active front-end IGBT rectification method and system with high adaptability of fusion type, which can operate stably under grid voltage distortion conditions, and realize deep harmonic suppression and high efficient energy bidirectional flow.

This invention discloses a method for inverting atmospheric N2O column concentration based on thermal infrared satellite remote sensing, belonging to the field of atmospheric environment remote sensing technology. The method includes: acquiring and preprocessing satellite observation data; selecting a specific spectral range as the inversion characteristic spectral region; introducing a fast radiative transfer model to construct a forward simulation operator to simulate the radiance of the top atmospheric layer; selecting N2O-sensitive characteristic bands with high signal-to-noise ratio and low interference based on a channel optimization strategy using the N2O / CO2 Jacobi intensity ratio; constructing an extended state vector, using surface temperature as an unknown parameter and performing joint optimal estimation iterative inversion with the N2O profile to correct the surface temperature in the reanalysis data, thereby achieving high-precision inversion of N2O atmospheric column concentration. This invention transforms surface temperature from a fixed input parameter into a state variable to be inverted, effectively decoupling surface temperature error from the N2O signal, eliminating systematic bias, and significantly improving the inversion accuracy of N2O column concentration.

According to the Hall position measurement optimization method of the moving-magnet type magnetic suspension planar motor, the magnetic field characteristics of a Halbach permanent magnet array are combined, an orthogonal Hall array is adopted to obtain a magnetic induction intensity signal, and a cascade delay elimination algorithm is introduced to suppress harmonic distortion, so that the displacement calculation precision is improved. A time delay signal elimination method is a method for eliminating signal interference caused by time delay, a harmonic signal is effectively eliminated by carrying out time delay processing on a voltage signal and combining the voltage signal with an original signal, and meanwhile the integrity of a fundamental component can be reserved. The signal is delayed by a quarter of a period by using the voltage quantity under the alpha and beta coordinate systems, and is combined with the original signal. In the process, a harmonic component in the signal can be eliminated, and a fundamental component is ensured not to be influenced by delay attenuation, so that a phase error caused by harmonic waves can be effectively avoided. Experimental results show that harmonic waves can be effectively filtered out.

A method and system for suppressing leakage signal of continuous wave SAR by using secondary sampling, according to the characteristics that the leakage signal is strongly superimposed on the weak echo signal in the SAR system, after the first digital sampling of the SAR echo signal, secondary sampling is performed after the original signal cancellation (suppression of leakage signal) of the digital-to-analog conversion, and finally the effective echo data is obtained. The method can suppress the leakage signal without improving the antenna isolation, and can lay the foundation for the application of continuous wave SAR on satellite platform.

A radio frequency (RF) switch employing differential signal cancellation is disclosed. The differential RF switch enables high isolation and extremely small size by employing cascode current steering within a differential switching amplifier. Unlike series RF switches, isolation with the differential RF switch is limited by device mismatch, not switch parasitic capacitance, enabling high frequency operation. Since the differential RF switch can be placed within the already present cascode devices, there is no additional insertion loss from the switch.

The application discloses an 8-point phase array non-basic harmonic suppression method and system based on a magnetic encoder and the magnetic encoder, eight magnetic sensitive elements are regularly arranged along the circumferential direction of a magnetic ring of the magnetic encoder, are divided into four groups of differential pair signals, magnetic field signals output by the magnetic sensitive elements are acquired, original differential signals of each group are calculated, and basic reference deviation and even harmonic components are eliminated; the eight magnetic sensitive elements are distributed to sine and cosine channels, third harmonic components of the sine channel are eliminated according to two groups of original differential signals corresponding to the sine channel, pure sine signals are obtained, and third harmonic components of the cosine channel are eliminated according to two groups of original differential signals corresponding to the cosine channel, and pure cosine signals are obtained. According to the application, the eight magnetic sensitive elements are arranged according to a certain rule, signal vectors of specific space phases are superposed, third harmonic components are mutually offset in an analog front end, and third harmonic components, even harmonic components and basic reference deviation are completely eliminated from a physical hardware layer.

A multi-chip module (MCM includes a substrate and first and second integrated circuit chips disposed on the substrate. The second IC chip includes transceiver circuitry configured to communicate with the first IC chip. The transceiver circuitry includes transmit circuitry having an inverter circuit to generate a first signal for transmission to the first IC chip along a signaling link. The signaling link includes a line termination impedance. Receiver circuitry includes a receiver circuit to receive a second signal from the first IC chip along the signaling link concurrently with transmission of the first signal along the signaling link. Hybrid circuitry is coupled to the transmit circuitry and to the receiver circuitry. The hybrid circuitry is configured to cancel a received component of the first signal. The hybrid circuitry includes a replica termination impedance that is configured in an open state.

The invention discloses a narrow linewidth optical fiber interferometer laser system and method based on a spread spectrum technology, and belongs to the technical field of optical fiber communication. The narrow linewidth optical fiber interferometer laser system comprises a laser, a first acousto-optic modulator, a first coupler, a second acousto-optic modulator, an optical loop device, a second coupler, a detection frequency mixing module and a power divider. According to the invention, low noise of a narrow linewidth optical fiber interferometer laser system is realized by using the structure of a circulating optical fiber loop, and the influence of higher harmonics of radio frequency signals and optical fiber reflection on the performance of the system is eliminated through spread spectrum driving signals applied to the second acousto-optic modulator. A narrow linewidth optical fiber interferometer laser system with low additional noise and high robustness is realized.

The invention discloses a high-speed camera jitter error compensation method suitable for rotating body micro-amplitude vibration measurement, which comprises the following steps of: acquiring a continuous image sequence containing a rotating body target and a calibration plate through a high-speed camera, and applying random excitation to a vibration table by using an excitation hammer in the acquisition process to simulate external jitter; selecting a preset number of sample images from the continuous image sequence, marking a rotating body target area for the selected sample images, and dividing the selected sample images into a training set and a verification set according to a preset proportion; taking each frame of image in the obtained continuous image sequence as input of a PnP algorithm, and obtaining camera jitter projection errors of each frame of image in x and y directions under a pixel coordinate system; obtaining a trained error compensation network model; inputting each frame of image in the continuous image sequence into the trained error compensation network model in sequence, and extracting a mixed vibration displacement signal of the rotating body; and in combination with the obtained camera jitter projection error, eliminating the jitter error of the mixed vibration displacement signal of the rotating body to realize correction, and outputting a real vibration displacement signal of the rotating body. According to the invention, through collaborative fusion of the PnP pose tracking technology and the error compensation network model based on deep learning, camera shake interference is effectively eliminated.

The present disclosure relates to an echo cancellation method, an echo cancellation device, an electronic device and a storage medium, which are applied to a terminal with a speaker and a microphone, and the method comprises: estimating a linear echo component in an input microphone signal according to a speaker signal output by the speaker; cancelling the linear echo component in the microphone signal according to a linear echo signal; estimating a residual echo component in a linear echo cancellation signal and determining a first suppression parameter according to a spectrum of the microphone signal and a spectrum of the linear echo signal; estimating a reverberation echo component in the linear echo cancellation signal according to linear echo signals of the previous N frames; determining a second suppression parameter according to the linear echo cancellation signal and a reverberation echo signal; and processing the linear echo cancellation signal according to the first suppression parameter and the second suppression parameter to output an echo cancellation signal. Thus, on the basis of linear echo cancellation, the processing of the call signal is realized through fast and accurate reverberation echo estimation, and the call effect is improved.

A method comprises performing an iterative calibration process in which transmit signals are transmitted via respective different selected subsets of antenna elements of a transmit phased array antenna of a radar system and corresponding amounts of transmit signal energy are monitored in a receive phased array antenna of the radar system to determine impacts of the different selected subsets of antenna elements of the transmit phased array antenna on isolation between the transmit and receive phased array antennas. The method further comprises identifying a particular one of the different selected subsets of the antenna elements of the transmit phased array antenna based at least in part on their relative impacts on the isolation between the transmit and receive phased array antennas, and utilizing the particular identified subset of the antenna elements of the transmit phased array antenna for isolation-enhancing transmit signal cancellation during operation of the radar system.

The invention belongs to the field of wireless communication, and particularly provides an on-chip integrated electronic balance duplexer, so that the duplexer can simultaneously transmit and receive at the same frequency, and the limitation that a traditional duplexer needs to work at different frequency bands is eliminated. The electronic balance duplexer is composed of switches SW1-SW4, a transformer and an RC impedance tuning module. A primary coil of the transformer is connected with a differential signal output by the TX circuit, one end of a secondary coil of the transformer is connected with an antenna through a switch SW1, the other end of the secondary coil of the transformer is grounded through a switch SW4, and meanwhile, the grounding end of the secondary coil of the transformer is connected with an RC impedance tuning module; the center tap of the secondary coil of the transformer is connected with the input end of the RX circuit through the switch SW3, and meanwhile the input end of the RX circuit is connected with the antenna through the switch SW2. In conclusion, through impedance balance of the RC impedance tuning module and the antenna, the principle of TX signal cancellation is realized, so that TRX signals work at the same time and at the same frequency, the applicability is wide, and on-chip integration is easy to realize.

The application provides a temperature compensation circuit, comprising: a first resistance unit, the first resistance unit being used for outputting a reference voltage changing with temperature; a second resistance unit, the second resistance unit being used for outputting a control voltage changing with temperature; a transconductance unit, a first input end of the transconductance unit being connected to the reference voltage, and a second input end of the transconductance unit being connected to the control voltage; wherein the transconductance unit is used for performing common-mode signal cancellation on the reference voltage and the control voltage changing with temperature, and outputting an output voltage with a temperature coefficient of 0. The application outputs the reference voltage changing with temperature through the first resistance unit, outputs the control voltage changing with temperature through the second resistance unit, and finally performs common-mode signal cancellation on the reference voltage and the control voltage changing with temperature through the transconductance unit, so as to output the output voltage with the temperature sensitive coefficient of 0, and avoid the phenomenon that the temperature compensation is abnormal due to the non-ideal reference element with positive and negative temperature coefficients.

This application provides a method for interpolating a sensor signal, comprising the following steps: interpolating N measurement points x of the signal to be measured using an unequal interval interpolation method. i (i=0,1,...,N-1) is calculated, and then the N measurement points x0, x1,...,x obtained from the calculation are calculated. N-1 After converting and calculating N corresponding electrical signals yi, x i and y i The data is constructed into pairs, and N interpolation points (x i ,y i ) obtains the above N interpolation points (x i ,y i Based on this, polynomial interpolation is performed to calculate the interpolation function y=f(x). The sensor then obtains the value of the signal under test x by solving the equation for the electrical signal y based on the interpolation function y=f(x), and establishes a correspondence between the electrical signal y and the signal under test x. The interpolation function signal obtained by the above method of this invention can accurately reproduce the original signal collected by the sensor-sensitive element, eliminating the Runge vibration phenomenon, allowing the sensor to obtain more accurate measurements, and improving the accuracy of the sensor. This invention further provides a sensor, terminal device, and storage medium that use the above signal interpolation method.