21 results about "Signal cancellation" patented technology

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 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.

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.

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.

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.

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.

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.

The application discloses a multi-antenna receiving beam forming method of GMSK frequency hopping signals, which comprises the following steps: based on a known GMSK training sequence and by an approximate maximum posterior probability method, accurately estimating a real direction of an expected signal, so as to effectively correct a mismatched direction vector; on this basis, further adopting a covariance matrix reconstruction technology, removing an expected signal component from a sampling covariance matrix, effectively suppressing the expected signal cancellation phenomenon, and being able to perceive a spatial interference distribution and form a relatively accurate null in the interference direction, and significantly improving the output signal-to-interference-and-noise ratio performance of the system.

To obtain a delay profile that accurately reflects the frequency characteristics in the actual radio wave propagation environment. [Solution] The delay profile measuring device 1 comprises a frequency characteristic calculation unit 30a that calculates the frequency characteristics of a received signal, and a delay profile calculation unit 40 that calculates a delay profile in the time domain. The delay profile calculation unit 40 includes an FFT unit 50 that generates a feedback signal obtained by converting the delay profile to the frequency domain, an IFFT unit 43 that converts the error signal between the frequency characteristics and the feedback signal to the time domain, a first threshold processing unit 44 that sets to zero any signals in the time domain whose amplitude is less than or equal to a first threshold, and an adder unit 46 that updates the delay profile by adding the signal processed by the first threshold processing unit 44 to the delay profile.

The present disclosure relates to a vehicle-mounted living body detection method and device, a vehicle, a computer readable storage medium and a computer program product, and relates to the technical field of intelligent cockpit. The vehicle-mounted living body detection method comprises: acquiring a UWB response signal; performing Fourier transform on the UWB response signal to obtain a response spectrum signal; determining a target signal peak according to the signal energy of the response spectrum signal; in response to the frequency of the target signal peak not being located in a breathing frequency band, determining that the target signal peak corresponds to an interference signal; performing signal cancellation processing on the UWB response signal based on the interference signal to obtain a target response signal; and performing living body detection based on the target response signal to determine whether there is a living body in the vehicle cabin. The method suppresses the strong Doppler component generated by the moving object in the cabin by performing cancellation processing based on the identified interference signal, significantly improves the accuracy and robustness of the in-vehicle living body detection, and effectively reduces the false positive and false negative risks.

This invention discloses a spurious signal cancellation method, apparatus, electronic device, storage medium, and product, relating to the field of wireless communication technology. The spurious signal cancellation method includes: performing frequency shift processing on original data according to the frequency point of the spurious signal to obtain a target frequency-shifted signal; determining the DC component of the target frequency-shifted signal, and determining the amplitude and phase information of the spurious signal based on the DC component; determining an initial cancellation signal for each frequency point based on the target frequency-shifted signal corresponding to the spurious signal and the amplitude and phase information; determining a phase compensation signal for each frequency point based on the link processing delay; determining a target cancellation signal according to the phase compensation signal and the initial cancellation signal of the corresponding frequency point; and performing spurious signal cancellation on the original data based on the target cancellation signal, thereby compensating for the cancellation signal at the frequency points, eliminating the need for delay alignment operations on the original signal, and significantly reducing the overall data delay of the receiver link.

The application provides a miniaturized cold Rydberg atom antenna device and a noise double-mode suppression method, relates to the technical field of quantum information, and vacuum compatible integrated atom source modules maintain the vacuum degree of a glass vacuum cavity through outgassing sheets and getter sheets; a low-temperature magnetic optical trap can cool atomic gas and gather the cold atomic gas into an F-P cavity; a Rydberg atom detection module can use coupling light to excite atoms to a Rydberg state, use detection light to detect information when cold Rydberg state atoms are split by EIT-AT after a microwave electric field is applied, and generate a main detection signal; an F-P cavity fluorescence suppression module can collect fluorescence emitted by cold Rydberg state atoms and generate a fluorescence noise signal; and a signal processing module can eliminate fluorescence noise based on the main detection signal and the fluorescence noise signal. Through the above mode, the problems that a Rydberg atom antenna device based on cold atoms is large in size and difficult to suppress fluorescence noise are solved, and the detection performance of the device can be improved.

This application pertains to a control method that addresses the technical problems of existing phase-locked loop (PLL) structures being unable to adapt to complex operating conditions under non-ideal power grids, failing to balance performance and real-time capabilities, lacking practical application capabilities, and insufficient consideration of dynamic changes in power grid impedance. It provides a PLL control method and related devices for energy storage converters. Through multiple series-connected delay signal cancellation modules, multiple subharmonics in the PLL input are eliminated, thus removing interference components and accurately extracting the fundamental positive-sequence component of the power grid voltage. Then, an orthogonal signal generator using a second-order generalized integrator separates the subharmonic-eliminated input into positive and negative sequence components. Based on these components, the positive components of the input in the two-phase stationary coordinate system are calculated. Finally, the PLL is applied to the positive components in the two-phase stationary coordinate system to obtain phase information.

This invention relates to a method and system for simultaneous, full-duplex, digital-domain adaptive self-interference cancellation based on Conv-BiLSTM and LS, and relates to self-interference signal cancellation technology in the field of communication. The purpose of this invention is to propose a method for simultaneous, full-duplex, digital-domain adaptive self-interference cancellation based on Bayesian optimization algorithm to determine the self-interference channel length, combined with Conv-BiLSTM and LS, to solve the problems existing in the background technology. Key technical points: First, the self-interference channel length is estimated using a Bayesian optimization algorithm. Then, based on the determined parameters, LS is used to perform linear self-interference cancellation on the self-interference signal. Next, the constructed Conv-BiLSTM network is trained to fit the nonlinear components of the self-interference. Compared with FFNN, the constructed Conv-BiLSTM network can more effectively handle high-dimensional time-series signals and has a good effect on predicting nonlinear distortion signals with memory. Finally, the reconstructed self-interference signal is subtracted from the received signal at the receiving end to achieve the purpose of self-interference cancellation.

The application provides an interference signal elimination method and device, a storage medium and a computer program product. The method comprises the following steps: determining an error value based on a received input signal and a filtered signal output by a filter; determining a step value based on the error value and an error threshold; determining a filter coefficient based on the step value, and eliminating an interference signal based on the filter coefficient.

The invention discloses a grid-connected inverter stability control method based on an improved phase-locked loop, and belongs to the technical field of new energy grid-connected control, and the method comprises the steps: firstly building a grid-connected inverter impedance model, and revealing a mechanism that the phase-locked loop introduces negative damping and reduces stability margin under a weak power grid; based on an impedance model, a composite control strategy fusing dynamic feed-forward compensation and an improved Kalman observer is designed, the former actively counteracts the negative impedance effect of a phase-locked loop, and the latter improves dynamic response through state reconstruction and advanced prediction. Finally, an improved cascade delay signal elimination phase-locked loop with a selective conduction harmonic filtering function is provided, and the improved cascade delay signal elimination phase-locked loop is deeply integrated with the control strategy and a multi-harmonic feedback link, so that high-precision phase locking and active harmonic suppression are realized. According to the method, the operation stability, the dynamic performance and the electric energy quality of the grid-connected system under the conditions of high background harmonic waves and weak power grids are remarkably improved.

The present application relates to the technical field of computers. Disclosed are an audio processing method and apparatus, and a device and a storage medium. The method is executed by a terminal device, which comprises a first speaker and a second speaker. The method comprises: when a first speaker and a second speaker are respectively located on two sides of a terminal device, acquiring a left-channel difference signal, a right-channel difference signal and a common signal in an audio signal; when the terminal device is in a first state, executing enhancement processing on the common signal to obtain a processed audio signal; and when the terminal device is in a second state, respectively executing signal cancellation processing on the left-channel difference signal and the right-channel difference signal to obtain a processed left-channel audio signal and a processed right-channel audio signal. According to the present application, different audio processing methods are used on the basis of the positions on two sides where a first speaker and a second speaker are located from a visual effect perspective, thereby improving the stereophonic playback effect.

This invention discloses a method for canceling secondary cooperative interference of vortex electromagnetic wave modes, comprising: the transmitter selecting a primary OAM mode and a secondary OAM mode; based on a set of keys and real-time times defined by the transmitter and receiver respectively, the transmitter generating a secondary cooperative transformation sequence of modes, and based on the secondary cooperative transformation sequence, dividing the input binary information bits into OAM mode index information bits and signal modulation bits, and jointly designing the positional distribution of the two in the information frame structure; after determining the G secondary cooperative transformation OAM modes activated in each hop, the transmitter loading the G secondary cooperative transformation OAM modes carrying constellation point symbols onto each element of the antenna, and transmitting the resulting G mutually orthogonal vortex electromagnetic wave mode secondary cooperative transformation signals to the receiver; the receiver performing detransformation and interference signal cancellation on the received signal, and estimating the signal vector by searching for constellation point symbols, thereby effectively improving spectral efficiency and enhancing anti-interference capability.

The present application provides a kind of multi-probe staggered infrared detection device, the infrared detection device is based on the structure and arrangement design of at least two pyroelectric sensors, there is suitable interval between the sensitive element in the same signal channel, so that the field of view formed by the sensitive element of different pyroelectric sensors can be staggered, while weakening the signal cancellation degree between the sensitive element in the same signal channel, the projection of the field of view of the infrared detection device in unit area forms blind area, and the behavior of corresponding infrared radiator across the field of view boundary can be effectively responded by the infrared detection device based on the isolation between different pyroelectric sensors in signal channel, and then under the gap size requirement limit between the sensitive element in the same signal channel, the equivalent improvement of the field of view density of the infrared detection device is formed, and the detection sensitivity of the infrared detection device is improved to be suitable for micro-motion detection scene beyond the limit.