80 results about "Skew" patented technology

The invention provides a high-frequency welded pipe roller wear state monitoring method and device, and relates to the technical field of artificial intelligence and data processing, a holographic sensing system of working condition parameters and physical signals is constructed through synchronous monitoring of a multi-source sensor, and noise spectrum offset is tracked in real time based on time-frequency expression of data in different modes, so that the real-time monitoring of the wear state of a high-frequency welded pipe roller is realized. And an anti-error filtering protection channel is constructed, so that the inherent characteristics of the damage can be effectively captured. In addition, multi-physical field damage characterization information is fused from multiple complementary dimensions of transient impact (instantaneous frequency vector), spectrum complexity (spectral entropy) and amplitude distribution deflection (skewness), more comprehensive and richer state description can be provided, accurate quantitative evaluation of the roller wear level is achieved, and the capacity of real-time monitoring and accurate recognition of the roller wear state is remarkably improved.

An apparatus includes a clock skew calibration circuit configured to be coupled to a multi-phase clock generator through a plurality of delay lines, wherein a first clock skew calibration unit comprises a frequency doubler configured to receive a plurality of multi-phase clock signals and generate a clock signal based on the plurality of multi-phase clock signals, a frequency divider configured to receive the clock signal and generate a reduced frequency signal based on the clock signal, and a delay line control circuit configured to compare the duty cycle of the reduced frequency signal with a predetermined duty cycle, and generate a first control signal to adjust the skew of the first multi-phase clock signal through adjusting a first delay applied to the first multi-phase clock signal until a calibrated signal of the first multi-phase clock signal is achieved.

The invention discloses a non-uniform clutter and interference cooperative suppression target fusion detection method and system, and relates to the technical field of broadband radar signal processing, and the method comprises the steps: carrying out the unitary transformation of test data, a clutter covariance matrix, a target coordinate matrix and an interference coordinate matrix based on the skew symmetry of the clutter covariance matrix; constructing a distance extension target Gradient detection statistical magnitude under the condition of a known clutter skew symmetry covariance matrix; calculating the maximum likelihood estimation of the clutter skew symmetry covariance matrix; based on the maximum likelihood estimation of the clutter skew-symmetric covariance matrix and the distance expansion target Gradant detection statistic, constructing a target detection statistic of non-uniform clutter and interference cooperative suppression; performing target fusion detection on the target detection unit based on the target detection statistical magnitude and a preset detection threshold; according to the invention, the technical problems of complex construction process and high calculation complexity of the target detector in the prior art are solved.

An apparatus includes a clock skew calibration circuit configured to be coupled to a multi-phase clock generator through a plurality of delay lines, wherein a first clock skew calibration unit comprises a frequency doubler configured to receive a plurality of multi-phase clock signals and generate a clock signal based on the plurality of multi-phase clock signals, a frequency divider configured to receive the clock signal and generate a reduced frequency signal based on the clock signal, and a delay line control circuit configured to compare the duty cycle of the reduced frequency signal with a predetermined duty cycle, and generate a first control signal to adjust the skew of the first multi-phase clock signal through adjusting a first delay applied to the first multi-phase clock signal until a calibrated signal of the first multi-phase clock signal is achieved.

The invention provides an axial skewed pole motor eccentricity detection method based on asymmetric layered Hall, and the method comprises the following steps: respectively installing a first group of linear Hall sensors and a second group of linear Hall sensors on a first axial layer and a second axial layer of a stator notch of an axial skewed pole motor in an asymmetric manner; after analog-to-digital conversion is carried out on the voltage signals detected by the linear Hall sensor, a pair of orthogonal third harmonic sinusoidal signals is obtained through grouping signal superposition, and the eccentric direction is determined; and based on a complex factor filter and a synchronous reference system phase-locked loop, extracting amplitudes of a positive sequence signal, a negative sequence signal and a sideband signal from the third harmonic sinusoidal signal, and further calculating a static eccentricity rate and a dynamic eccentricity rate. According to the axial skewed pole motor eccentricity detection method, two groups of linear Hall sensors are mounted in a layered and asymmetric manner, so that the eccentricity detection sensitivity and precision are effectively improved, the eccentricity state change in the motor operation process can be quickly responded, and the dynamic and static eccentricity rates and the eccentricity direction are output.

The invention relates to the technical field of broadband radar signals, and provides a radar target robust intelligent detection and interference adaptive suppression method and system, and the method comprises the steps: carrying out the decorrelation transformation of received data and a parameter matrix through employing the skew symmetry characteristic of a clutter covariance matrix, and completing the preprocessing of initial data; carrying out correlation calculation estimation under the condition of no target hypothesis and under the condition of target hypothesis, and constructing distance extension target Gradient detection statistics under the condition of a known clutter skew symmetry covariance matrix; constructing a detection statistic lambda of the radar target robust intelligent detection and interference adaptive suppression method; and determining a detection threshold T through theoretical calculation or Monte Carlo simulation according to a preset false alarm probability, comparing the detection statistic lambda with the detection threshold T, and judging whether a distance expansion target exists in the current distance unit to be detected or not according to a comparison result. According to the method, an analytical expression design is adopted, a complex iterative calculation process is avoided, and the operation efficiency is improved.

The invention relates to a positioning method, a positioning device and a readable storage medium, and relates to the technical field of satellite navigation. The positioning method is applied to a receiver, and the receiver receives a pseudo satellite signal sent by each target satellite in a plurality of target satellites simulated by a pseudo satellite base station; wherein the number of the target satellites is at least four, and the target satellites are satellites which are invisible at the position where the receiver is located; for each pseudo-satellite base station, determining auxiliary positioning information of the pseudo-satellite base station according to the pseudo-satellite signal corresponding to the pseudo-satellite base station; wherein the auxiliary positioning information comprises the base station position of the pseudo satellite base station and the clock skew, and the clock skew is the skew between the clock of the pseudo satellite base station and the local clock of the receiver; and determining the position of the receiver according to the auxiliary positioning information of the pseudo satellite base station.

The application discloses a method for compensating internal skew of a differential via channel, comprising the steps of: calculating skew time between differential signals; using obtained material parameters to establish a model of a PCB and a differential via; simulating the established high-precision differential model to obtain S parameters of the differential via structure through simulation; obtaining S parameters and differential internal skew values of a design measurement to calibrate a scale factor of 3D modeling; optimizing stub length difference h in the differential via structure; comparing whether the optimization result meets a design allowed differential internal skew target value, if yes, optimization is completed, and if not, stub length difference h is continuously optimized. The application occupies small layout and wiring space, and the proposed differential via structure compensates for skew of differential phase in time, effectively avoiding the influence of internal skew.

A method for estimating the statistical characteristic parameters of ice-source noise sound pressure belongs to the field of underwater acoustic signal processing technology. The statistical characteristic parameters include a characteristic exponent α, a scale parameter γ, a skew parameter β, and a location parameter δ. The method includes: 1) basic theoretical analysis of the α-stable distribution; 2) estimation of the scale parameter γ; 3) calculation of the characteristic function point ω; 4) estimation of the characteristic exponent α; 5) estimation of the skew parameter β; and 6) estimation of the location parameter δ. A statistical characteristic parameter estimation method model is constructed based on the α-stable distribution theory to achieve rapid estimation of the four statistical characteristic parameters of ice-source noise sound pressure with non-stationary and impulsive characteristics. The value of the second characteristic function point is determined by the estimated result of the scale parameter. The skew parameter is estimated by selecting different estimation formulas based on the size of the characteristic exponent. This method is applicable to both skewed and symmetric α-stable distributions, has high estimation accuracy, and does not require a quantile table, making the calculation simple.

To provide a receiving device and a transmitting / receiving system having a de-skew function for estimating an accurate amount of skew in a short time over a wide range of data rates.SOLUTION: In a transmitting / receiving system 1, a receiving device 20 includes a clock delay unit 21, a sampling unit 22, and a delay amount setting unit 23. The clock delay unit delays a received clock and outputs the clock with delay added. The sampling unit samples a data signal received with the delayed clock output by the clock delay unit. The delay amount setting unit sequentially sets a clock delay amount to each value during a training period in which a training data signal and a clock are sent from a transmitting device 10, samples the training data signal output by the sampling unit at each set value to obtain a data sequence, and after the end of the training period, sets the clock delay amount within a matching range in which the data sequence obtained at each set value matches the training data signal.SELECTED DRAWING: Figure 1

An apparatus and method for timing skew calibration. For example, the apparatus may include an analog-to-digital conversion circuit configured to sample an input signal based on a clock signal and convert the sampled input signal into a digital code, a skew detection circuit configured to calculate a first sum of standard deviations for respective levels of the digital code, compare the first sum of the standard deviations with a previously calculated second sum of standard deviations, and select a smaller value from among the first sum and the second sum, and a compensation circuit configured to compensate for a skew of the clock signal based on the selected one of the first sum and the second sum.

The present disclosure is a parallel signal transmission system comprising: a transmission device that transmits a parallel signal by using a wavelength-multiplexed signal; a reception device that receives the wavelength-multiplexed signal from the transmission device and outputs the parallel signal; and a wavelength switching unit that is connected between the transmission device and the reception device and that changes at least one of the transmission wavelengths of the parallel signal so as to reduce the skew of the parallel signal in the reception device.

The present invention provides a circuitry including a first sampling circuit and a second sampling circuit. The first sampling circuit is configured to use a first clock signal to sample first data to generate sampled first data to a plurality of first lanes of a transmitter via a plurality of first connection lines. The second sampling circuit is configured to use a second clock signal to sample second data to generate sampled second data to a plurality of second lanes of the transmitter via a plurality of second connection lines. Lengths of the plurality of second connection lines are longer than lengths of the plurality of first connection lines, and delay amount of the second clock signal is less than delay amount of the first clock signal.

The invention relates to the technical field of integrated circuit verification, in particular to a queue-based clock frequency deviation monitoring device, which comprises an initialization module used for setting module-related initialization data; the clock event capturing module is used for monitoring the edge of a clock signal in real time and obtaining the accurate simulation time of the moment; the queue management and reference model module is used for storing timestamp information into a dynamic queue as required; the comparison and report module is used for obtaining the size of the queue, comparing the size of the queue with the alarm upper limit and the alarm lower limit in real time and outputting a corresponding report according to a comparison result, the dynamic distribution and efficient operation characteristics of the SystemVerilog queue are utilized, clock events are stored and processed in real time, long-time and multi-clock-domain continuous monitoring is supported, and the real-time performance of the system is improved. An efficient, reliable and low-cost solution is provided for clock verification of a modern digital integrated circuit, and verification completeness and automation level are greatly improved.

The present invention is an energy management system that realizes energy conservation focusing on a frequency distribution indicating the frequency of energy consumption amounts in an energy demand facility, the energy management system managing consumed energy in the energy demand facility, wherein the energy management system comprises a clustering unit for clustering past energy consumption amounts for the energy demand facility into a plurality of clusters on the basis of a prescribed condition, a modeling unit for modeling a frequency distribution indicating the frequency of the energy consumption amounts in each cluster into a distribution having at least one positive skew, and a schedule adjustment unit for adjusting the operation schedule of the energy demand facility so as to reduce the variance of the modeled distribution.

A transport device includes a skew correction unit configured to correct skew of a medium by colliding with the medium and a buffer unit provided with a contact portion configured to come into contact with the medium between a first transport unit transporting the medium to the skew correction unit and the skew correction unit in a transport direction. The buffer unit is configured such that a second transport velocity is lower than a first transport velocity, the first transport velocity being a transport velocity of the medium upstream of the buffer unit in the transport direction, the second transport velocity being a transport velocity of the medium when the medium collides with the skew correction unit after coming into contact with the contact portion. The buffer unit is configured such that the contact portion does not collide with the medium strongly enough to correct the skew of the medium.

The application relates to the field of radio astronomy signal processing, and discloses a radio frequency interference reduction method and device for a phased array radio telescope, wherein the method comprises the following steps: acquiring relative position information of a plurality of navigation satellites, determining potential interference satellites from the plurality of navigation satellites according to the relative position information; acquiring a wideband signal collected by the phased array radio telescope, and determining a plurality of interfered subbands in the wideband signal; matching the interfered subbands with the potential interference satellites, and determining subband interference information of the interfered subbands according to a matching result; acquiring a signal subspace and an interference subspace of the interfered subbands, and then determining a skew projection matrix of the interfered subbands; and simultaneously performing interference reduction and digital beam forming on the interfered subbands according to the skew projection matrix and the signal subspace. The technical scheme provided by one or more embodiments of the application can realize continuous interference reduction of the phased array radio telescope on the in-orbit satellites.

To enable varying a skew amount without performing a mechanical operation.SOLUTION: A differential skew generation device 1 includes: a clock oscillator 2 for oscillating and outputting a clock signal; a first pattern generator 4A having a first output terminal 11A that outputs a positive signal to an evaluation target W at timing of a signal in which a phase angle is adjusted by IQ modulation of the clock signal, and a second output terminal 12A to which a terminator 5A is connected; and a second pattern generator 4B having a first output terminal 11B to which a terminator 5B is connected, and a second output terminal 12B that outputs a negative signal to the evaluation target W at timing of a signal in which a phase angle is adjusted by IQ modulation of the clock signal. The first pattern generator 4A and the second pattern generator 4B operate in synchronization with each other and allocate an integer unit of a UI of a set skew amount to transmission timing shift and a decimal unit as IQ modulation to control.SELECTED DRAWING: Figure 1

Systems and methods are provided for a multi-beamforming network using an antenna array. A matrix circuit is provided for feeding elements of the antenna array to generate multiple beams. To address beam skew, a series of phase shifters with specific phase delay characteristics are used between the matrix circuit and the antenna array elements to mitigate beam skew. Linearly increasing or decreasing phase differences between signals fed to adjacent antenna array elements across the antenna array mitigate or eliminate beam skew in the resulting multi-beams. The phase shifters are programmed to provide this increasing or decreasing phase difference.

A sequence pattern generation device that can control skew between lanes of a plurality of lanes by controlling a transmission start timing of a sequence pattern of a plurality of outputs. The sequence pattern generation device includes a primary module 2 and a secondary module 3 each having two outputs of data signals, and a device control unit 16 that, in a case where a start of a sequence of the outputs of the data signals is synchronized, sets delay amounts, aligns phases of clocks of the primary module 2 and the secondary module 3, locks phases of clocks of a primary data generation unit 26 of the primary module 2 and a secondary data generation unit 36 of the secondary module 3, and starts the sequence with the delay amounts set in the primary data generation unit 26 and the secondary data generation unit 36.

The application provides a minimum phase channel skew correction method and device, electronic equipment and storage medium, and relates to the technical field of communication.The application first acquires training result data corresponding to each line pair of a plurality of line pairs of a target communication system in a training mode, wherein the training result data includes a tap coefficient sequence of a DFE and a received symbol sequence; the plurality of line pairs include a reference line pair and a plurality of to-be-corrected line pairs; then, based on the tap coefficient sequence corresponding to each line pair and a preset cross-correlation operation algorithm, timing offset data is determined; further, based on the timing offset data and the received symbol sequence corresponding to each line pair, the receiving order of each line pair is determined, so as to correct the skew of the target communication system in a data transmission mode based on the timing offset data and the receiving order of each line pair. In this way, skew correction with low complexity and high reliability is realized, the skew correction can be quickly completed in the starting stage, and the accuracy of data transmission is ensured.

A circuit is disclosed that includes timer interleaved (TI) analog-to-digital converter (ADC) circuitry that generates a digital output signal. Correction circuitry receives the digital output signal from the TI ADC circuitry and uses weight values to generate a corrected output signal to correct for time skew. The correction circuitry includes a derivative filter that removes a frequency dependency between the weight value and an input signal to the TI ADC circuitry. Weight update circuitry receives the correction output signal and generates an updated weight value for the correction circuitry. The weight update circuitry includes a notch filter that suppresses spectral content in the corrected output signal to eliminate spurious dependencies during a weight update process.

To provide a composite cable with a small outer diameter and reduced skew. [Solution] The composite cable 1 comprises a bundled core 3 formed by twisting together multiple stranded wires 2 in multiple layers, and a sheath 6 that covers the bundled core 3. The bundled core 3 includes multiple types of stranded wires 2, and the stranded wires 2 include quad stranded wires 21 formed by twisting together two pairs of differential signal lines 210 that transmit differential signals, and multiple quad stranded wires 21 are included in one layer of the bundled core 3.

A divider circuit is disclosed. The divider circuit includes a pair of differential latch circuits. The divider circuit receives complementary clock signals as a pair of differential signals. The divider circuit generates frequency divided signals based on the complementary clock signals, inverted versions of the complementary clock signals, and input signals. The frequency divided signals may be substantially ripple-free. Further, the frequency divided signals remain substantially ripple-free in a presence of the skew between the complementary clock signals.

As the timing-based servo (TBS) patterns of the first and second servo bands rotate, the heights of the upper and lower portions of the servo stripes of the servo frames of the TBS patterns are adjusted to compensate for the change in the usable height of the servo stripes caused by the rotation.

A data receiver, which communicates with a data transmitter through a plurality of lanes, includes: a first reception unit which receives first data through a first lane; a second reception unit which receives second data through a second lane; and a detector which compares the first data and the second data to detect a skew between the first lane and the second lane. The first reception unit includes a first clock data recovery unit which recovers a first clock and first payload data from the first data. The first reception unit controls a loop speed of the first clock data recovery unit based on a skew level of the skew.

The apparatus includes a clock skew calibration circuit configured to be coupled to the multi-phase clock generator via a plurality of delay lines, wherein the first clock skew calibration unit comprises: a frequency multiplier configured to receive a plurality of multi-phase clock signals and to generate a clock signal based on the plurality of multi-phase clock signals; a frequency divider configured to receive the clock signals and to generate a reduced frequency signal based on the clock signals; and a delay line control circuit configured to compare a duty cycle of the reduced frequency signal with a predetermined duty cycle and to generate a first control signal to adjust the skew of the first multi-phase clock signals by adjusting a first delay applied to the first multi-phase clock signals until a calibrated signal of the first multi-phase clock signals is achieved.

Disclosed are integrated circuit structures with buried rails and backside metals for routing input signals to and / or output signals from one or more cells of the integrated circuit structures. Port landing-free connections to input ports and / or from output ports are enabled. As a result, signal routing flexibility is enhanced.

The application belongs to the technical field of optical fiber communication, and proposes a receiver IQ skew measurement method and system based on frequency domain reorganization ZC sequence, comprising: generating ZC sequence based on two different root indexes for the training sequence of the transmitting end; calculating the real part and the imaginary part of the ZC sequence based on orthogonal frequency domain time-frequency transformation, reorganizing the sequence based on the real part and the imaginary part, and taking the reorganized ZC sequence as the training sequence of the transmitting end; and based on the frequency domain, block the received sequence signal, perform conjugate summation on adjacent frequency domain sub-blocks, solve the phase angle based on the summation result, and obtain the IQ skew based on the phase angle. Compared with the prior art, the application reduces the calculation complexity of error solving.

A method, apparatus, and computer program product for estimated transmit skew comprising restoring an I component and a Q component of a signal, extracting clock information from the I component, extracting clock information from the Q component, and determining the skew between the I component and the Q component using the extracted clock information from the I component and the extracted clock information from the Q component.