148 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 relates to the technical field of road slope safety monitoring, in particular to a slope large deformation timely sensing and graded warning method based on a distributed optical fiber technology, and the method comprises the steps: arranging a first-stage sensing optical cable, a second-stage sensing optical cable, a third-stage sensing optical cable and a positioning optical fiber which are designed in a mechanical property gradient manner on a slope platform, and achieving the cooperation with the deformation of a rock-soil body; a double-threshold self-adaptive denoising algorithm is adopted to process optical signals, environmental interference is eliminated, and breakpoints are accurately recognized; three-level alarm is triggered based on the broken optical cable level, the slope sliding acceleration is calculated through a catastrophe evolution prediction model, advanced early warning is achieved, and when specific conditions are met, special-level alarm is triggered, and emergency broadcast is linked; high-precision position determination is achieved through stake mark matching positioning, and stable operation of the system is guaranteed by combining design of a temperature compensation optical fiber, an independent monitoring route and the like. According to the invention, deformation of different degrees of the slope can be accurately sensed, graded warning and intelligent decision making are realized, and the accuracy and reliability of slope disaster prevention and control are effectively improved.

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 single-phase phase-locked loop system capable of intelligently adjusting parameters, and the system comprises a spectrum analysis unit which outputs a fundamental wave frequency fc, a fundamental wave angular velocity omega c, and a cascade delay signal elimination parameter ni; the self-adaptive single-phase phase-locked loop unit comprises a third-order generalized integrator, a dq converter, a cascade delay signal canceller CDSC, a PI controller, an integrator and a modulus taking device, and the cascade delay signal canceller CDSC takes a fundamental wave frequency fc as a reference frequency and takes a fundamental wave angular velocity omega c as a reference angular velocity of an input end of the integrator; an angular velocity increment delta omega output by the PI controller and a fundamental wave angular velocity omega c are added to jointly determine a phase locking angle theta, and a proportionality coefficient kp and an integral coefficient ki of the PI controller are refreshed online from the outside and take effect immediately; and the control parameter intelligent optimization unit is used for iteratively solving the optimal [kp, ki] based on a mirage search optimization algorithm MSO and writing the optimal [kp, ki] into the nonvolatile memory. According to the single-phase phase-locked loop system capable of intelligently adjusting the parameters, manual parameter adjustment is avoided, and phase locking is rapid, accurate and stable for a long time.

The invention discloses a variable-speed working condition rolling bearing fault diagnosis method based on improved wavelet packet transformation and envelope order tracking, and the method specifically comprises the steps: carrying out the equal-angle resampling of a vibration signal according to the phase of a rotating shaft, and carrying out the wavelet packet transformation of an angle domain vibration signal through an improved wavelet packet transformation algorithm, and finally, fault diagnosis is carried out according to the transformed envelope order spectrum of the wavelet packet coefficient of each node. According to the method, time domain signals are converted into angle domain signals through equal-angle resampling, frequency spectrum fuzziness caused by rotating speed changes is eliminated, and the angle domain signals are divided to different order bands through the excellent frequency domain decomposition capacity of an improved wavelet packet transformation algorithm so that sub-signals with the high signal-to-noise ratio can be obtained. And finally, solving the envelope spectrum of the sub-signal to further highlight the fault characteristics. According to the method, the problem of difficulty in fault diagnosis of the variable-speed working condition bearing is solved, meanwhile, the process of determining a high-frequency resonance frequency band by means of a kurtosis graph and extracting a high-frequency resonance signal through band-pass filtering is avoided, and the diagnosis method is simple, efficient and high in accuracy.

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 relates to a temperature drift compensation flexible pressure sensor system based on bionic mechanics. The temperature drift compensation flexible pressure sensor system comprises a flexible sensing module, a temperature drift compensation module and a signal processing module. The flexible sensing module is designed by adopting a bionic mechanical structure, and the mechanical characteristics of biological tissues are simulated by compounding a plurality of layers of flexible materials, so that high-sensitivity pressure detection is realized; the temperature drift compensation module is integrated with a temperature sensor and a compensation algorithm, monitors the environment temperature change in real time, dynamically adjusts a sensing signal and eliminates temperature interference; and the signal processing module is used for filtering, amplifying and digitally processing the compensated signal and outputting pressure detection data. According to the system, through combination of bionic structure design and intelligent temperature drift compensation, the measurement precision and stability of the flexible pressure sensor in a complex environment are remarkably improved, and the system is suitable for high-precision pressure detection requirements in the fields of medical treatment, robots and the like.

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.

The invention discloses an interference signal offset method based on modulation interference accurate reconstruction, and belongs to the technical field of satellite communication. The method comprises the following steps: carrying out symbol estimation, time delay estimation, carrier phase estimation and amplitude estimation of an interference signal on a mixed signal; carrying out carrier recovery on the mixed signal, reconstructing a symbol, and generating an interference signal for offset; carrying out time delay on the mixed signal, and carrying out time alignment on the mixed signal and a regenerated interference signal; using a channel response estimation method to counteract interference signals in the delayed mixed signals, and outputting residual low-speed signals; and carrying out carrier phase reduction on the residual low-speed signals to finish interference signal cancellation. The power spectrum density of the low-speed signals in the overlapped satellite communication system can be effectively reduced, and the system capacity of the low-speed signals is improved under the condition that the low-speed signals occupy the total satellite power.

Techniques are disclosed for self-interference signal cancellation. A self-interference cancellation method includes measuring an error between an output of a hardware cancellation circuit and an output of a software model of the hardware cancellation circuit. The method further includes estimating an amplitude error, a phase error, and a delay error based on the measured error and the output of the hardware cancellation circuit, and locating a largest frequency domain error peak in the measured error. The method further includes applying an all-pass filter to the estimated and measured signals at the peak error frequency to produce a filtered estimated signal and a filtered measured signal and optimizing the filtered estimated signal and the filtered measured signal to obtain an optimized canceller setting. The optimized canceller setting is provided to the hardware cancellation circuit.

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.

There is disclosed an apparatus. The apparatus comprises means for performing: in response to detecting a jamming signal, obtaining a sample waveform of the jamming signal; and sending information of the jamming signal to another apparatus.

The present invention describes a rotor blade (2) having a leading edge (23) and a trailing edge (24), wherein the rotor blade (2) is designed and configured to be exposed to a fluid flowing substantially from the leading edge (23) to the trailing edge (24), the rotor blade (2) including at least two sensors (31) designed to detect the flow characteristics of the fluid and provide corresponding sensor signals, and the rotor blade (2) further including at least two actuators (32) for generating an anti-noise signal (36) based on the sensor signals, the sensors (31) being arranged along the spanwise direction at a surface of the rotor blade (2), and the actuators (32) being arranged along the chord direction at a surface of the rotor blade (2), and the actuators (32) being arranged and prepared such that flow-induced edge noise (35) of the rotor blade (2) generated by the fluid is at least partially eliminated by the anti-noise signal (36). The present invention further describes a method for forming such a rotor blade, and a related wind turbine.

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.

The present invention describes a user equipment (UE). The UE includes a receiving circuit configured to receive a radio resource control (RRC) message including information for configuring the UE to monitor a physical downlink control channel (PDCCH) for a downlink control information (DCI) format. The DCI format includes an interrupt transmission indication. The UE also includes a processing circuit configured to cancel a physical uplink shared channel (PUSCH) transmission in a physical resource block and / or symbol indicated by the interrupt transmission indication. The information is configured for each uplink bandwidth part (UL BWP). The interrupt transmission indication applies to a physical random access channel (PRACH) transmission associated with a contention-based random access procedure. The interrupt transmission indication does not apply to a PRACH transmission associated with a contention-free random access procedure.

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.

Disclosed are a camera perturbation effect evaluation and elimination method, device and storage medium. The method includes: decomposing a signal to be processed and eliminating them one by one to generate a plurality of second signal sets, obtaining a plurality of frequency domain mirror indexes according to curve information obtained after frequency domain analysis of the plurality of second signal sets and a mirror index formula, determining a perturbation signal based on a maximum frequency domain mirror index, and eliminating the perturbation signal to obtain a perturbation elimination signal.

The present invention relates to a method for eliminating interference signals from automotive millimeter-wave radars based on sparse low-rank decomposition. This method considers the standard deviation of the interference signal and the radar signal during interference signal elimination, eliminating target signal loss and enabling the generation of a complete and accurate target signal. Furthermore, the method eliminates the need for modern algorithms to optimize the model, offering excellent performance and requiring no prior knowledge. Therefore, it can be implemented on automotive millimeter-wave radars, demonstrating its potential for application.

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.

Techniques are disclosed for self-interference signal cancellation. A spectral density measurement system includes a self-interference cancellation circuit configured to generate a cancellation signal based on a first radio signal and a second radio signal, the first radio signal transmitted and the second radio signal received simultaneously. A first signal channel is configured to sample the first radio signal into a sampled first radio signal, and a second signal channel is configured to sample the second radio signal into a sampled second radio signal. The system further includes a cross power spectral density measurement module configured to generate a control signal for controlling the cancellation circuit based on the sampled first radio signal and the sampled second radio signal.