26 results about "Phase imbalance" patented technology

The invention discloses a resonant gyroscope two-channel phase imbalance error compensation method and device, which are applied to the field of resonant gyroscopes, and the method comprises the following steps: in a full-angle mode, sequentially changing a series of detection phase imbalance compensation values, and applying a forward angular velocity and a reverse angular velocity to a resonant gyroscope through a turntable, a first mapping relation set formed by the multiple detection phase imbalance compensation values and the corresponding first orthogonal control force amplitude difference values is obtained, and then the optimal detection phase imbalance compensation value is determined; standing the gyroscope, sequentially changing a series of excitation phase imbalance compensation values, and applying a forward angle control force and a reverse angle control force which are the same in size to enable the resonant gyroscope to virtually carry out self-precession, so as to obtain a second mapping relation set formed by a plurality of excitation phase imbalance compensation values and corresponding second orthogonal control force amplitude difference values; and further determining an optimal excitation phase imbalance compensation value. After the phase imbalance error is compensated, the control precision and performance of the gyroscope can be improved.

This invention discloses a broadband oscillation discrimination system and method based on a positive-sequence instantaneous power algorithm, comprising: an A / D sampling module for acquiring an analog signal and obtaining a synchronously sampled digital signal based on the analog signal; an FPGA module for calculating the positive-sequence instantaneous power based on the synchronously sampled digital signal and obtaining a second calculation result; and a CPU module for obtaining a broadband oscillation discrimination result based on the second calculation result. The FPGA module is connected to the A / D sampling module and the CPU module via a parallel data bus. Using positive-sequence instantaneous power to discriminate broadband oscillations can filter out the second harmonic component caused by three-phase imbalance, and also filter out new frequency components caused by this component superimposed on the broadband oscillation instantaneous power.

In a displacement monitoring method based on elliptical trajectory calibration and modified principal component analysis, four channels are compressed into two set signals through linear combination to solve null point issue in Doppler radar and cancel clutter effect. The two sets linear combined signals make two tilted elliptical trajectories which can be calibrated for DC offset, amplitude imbalance and phase imbalance using simple computation. Due to the elliptical trajectories are mirror symmetric tilt ellipses, the residual clutter can be cancelled to recover a clear Doppler phase after demodulation and combination.

A correction circuit for correcting an amplitude imbalance and a phase imbalance between an in-phase signal and a quadrature signal, the correction circuit comprising a plurality of variable gain circuits configured to provide in-phase and quadrature signals having balanced amplitudes and balanced phases, wherein each variable gain circuit is configured to apply a gain to amplify, attenuate or to pass a signal.

The present invention provides a method and system for correcting quadrature demodulation imbalance in optical fiber distributed acoustic wave sensing data. The method comprises: obtaining I / Q signals I0 and Q0 at each observation point on an optical fiber; performing DC offset correction on the I / Q signals I0 and Q0 to obtain DC offset-corrected I / Q signals I1 and Q1; performing amplitude imbalance correction on the DC offset-corrected I / Q signals I1 and Q1 using a Hilbert transform to obtain amplitude imbalance-corrected I / Q signals I2 and Q2; and performing phase imbalance correction on the amplitude imbalance-corrected I / Q signals I2 and Q2 using a Hilbert transform to obtain imbalance-corrected I / Q signals I3 and Q3. The method provided by the present invention can accurately correct I / Q signals, accurately and efficiently suppress optical fiber demodulation noise, and improve the quality of optical fiber distributed acoustic wave sensing data acquisition.

The invention discloses an IQ imbalance calibration method and system. The method comprises pre-calibration and fine calibration. During pre-calibration, firstly, M frequency points are selected in a sectional mode, narrow-band calibration is carried out, correlation factors of amplitude imbalance errors and phase imbalance errors of the multiple frequency points are obtained, interpolation fitting is carried out on zero frequency points, and frequency response characteristics in the whole bandwidth are obtained. On the basis, a solution equation is constructed to calculate a filter coefficient, and a filter is designed to compensate the IQ imbalance error. During fine calibration, based on the least square method, the compensation coefficient of the filter is calculated in a real-time and self-adaptive manner, whether iteration is updated or not is judged, iterative filtering is carried out to enhance the stability of the system, and the problem of calibration performance deterioration caused by environmental factors such as temperature change is effectively solved. Compared with traditional narrowband calibration, the calibration system combining pre-calibration and fine calibration has a calibration effect on receiver large-bandwidth IQ imbalance, the adaptive capacity of the calibration system to environment temperature changes is enhanced, and the calibration precision and robustness are improved.

A compact, broadband, transformer-based Quadrature Hybrid Coupler (QHC) (34) exhibits improved gain and phase imbalance over a broadband frequency range, compared to conventional QHCs (30) The QHC (34) comprises a combination of a conventional transformer- based QHC (30) and a constant-R bridged-T all pass delay element (32). The QHC (34) operates as a 90° phase shift splitter and combiner. Applications of the QHC (34) include balanced amplifiers and Load Modulated Balanced PAs (LMBA). The constant-R network provides a discrete equivalent of a wideband dispersion free transmission line, increasing the QHC (34) bandwidth. It introduces a constant phase delay for all frequencies. More than a mere combination of these two circuits, however, the inventive QHC (34) merges several of the passive elements (inductors / transformers) to reduce component count, and some capacitors are placed conveniently at the center of the transformer, resulting in a compact, broadband QHC (34).

The present invention provides a zero-IF transmit I / Q imbalance correction method and system, including: S1. After the zero-IF transmitter is powered on, parameter estimation is performed through a single-tone signal set within the frequency band to obtain the I / Q imbalance parameters of the zero-IF transmitter at different frequencies; the I / Q imbalance parameters include the phase imbalance parameter, amplitude imbalance parameter, and channel imbalance parameter of the local oscillator; S2. Correction filter parameters and phase imbalance parameters independent of frequency are calculated through the I / Q imbalance parameters, and the zero-IF transmitter is preliminarily corrected through the correction filter parameters and phase imbalance parameters; S3. The signals received by the preliminarily corrected zero-IF transmitter are tracked and analyzed to obtain the correction filter parameters and phase imbalance parameters in different time periods for tracking correction of the signals; the accuracy of I / Q imbalance correction for single-tone signals is improved; the adaptability to signal sources is increased.

The application relates to a method, device, medium and equipment for calibrating ultra-wideband unevenness and IQ imbalance, wherein the method comprises the following steps: receiving a single-tone signal at equal frequency intervals, and performing filtering processing on the single-tone signal to obtain a first single-tone signal; performing windowing processing and frequency domain conversion on the first single-tone signal to obtain a second single-tone signal; obtaining peak points of the second single-tone signal IQ two-way in the corresponding frequency domain, determining IQ phase imbalance information and IQ amplitude imbalance information according to the phases and amplitudes of the peak points; establishing an imbalance signal according to the IQ phase imbalance information and the IQ amplitude imbalance information; establishing a local standard signal, calculating the coefficient of an equivalent filter based on the imbalance signal and the local standard signal by using a least square method, and performing filtering on the single-tone signal according to the coefficient of the equivalent filter, so as to calibrate the ultra-wideband unevenness and the IQ imbalance. The application has the effect of effectively calibrating the ultra-wideband unevenness and the IQ imbalance of a receiver.

A radar device may identify a peak in an integrated range-velocity map. The peak may indicate one or more targets in the integrated range-velocity map and being associated with a range-velocity bin index. The radar device may extract, based on the range-velocity bin index associated with the peak, an actual signal vector from a plurality of range-velocity maps. Each range-velocity map in the plurality of range-velocity maps may correspond to a respective radar channel from a plurality of radar channels. The radar device may determine an estimated target signal vector based on the actual signal vector and a first estimated imbalance vector. The radar device may determine a second estimated imbalance vector based on the actual signal vector, the estimated target signal vector, and an error vector. The radar device may perform an action, associated with the plurality of radar channels, based on the second estimated imbalance vector.

The invention relates to an IQ phase imbalance broadband compensation method and device and computer equipment. The method comprises the following steps: determining the phase response of each channel; phase equalization all-pass filters of the corresponding channels are obtained based on the phase responses; carrying out cascade connection on the all-pass filter and the corresponding channel; and compensating each frequency point of the channel after each cascade all-pass filter. According to the method, the channels are equalized, and then the frequency points of the cascaded channels are compensated, so that the purpose of broadband calibration compensation between IQ is achieved, and IQ phase imbalance broadband compensation can be accurately carried out.

The invention discloses an IQ imbalance estimation and compensation method based on a constellation diagram, and belongs to the technical field of wireless communication signal processing. The method comprises the following steps: preprocessing a received signal, including frequency offset compensation, power normalization, matched filtering, symbol synchronization and phase correction; extracting constellation points of the demodulated signals, and mapping the constellation points to ideal constellation points; respectively constructing an amplitude error function and a phase error function, and estimating an IQ amplitude imbalance factor and a phase imbalance factor with high precision by using a least square method; and finally, compensating a received signal by using the estimated factor, and correcting a distorted constellation diagram. The core of the method is that low-complexity and high-precision IQ imbalance blind estimation and compensation can be realized only by using demodulated constellation point information without depending on a training sequence or pilot frequency, the bit error rate of the system is effectively reduced, and the method is particularly suitable for burst communication and high-order modulation systems.

Spurious signals in a receiver are rejected using a method of correcting amplitude and phase imbalances in the received signal. A system implementing the method can be built into the receiver or can be used during assembly of the receiver.

The invention discloses an online monitoring method and system for IQ damage of a feed-forward type full-blind coherent optical receiver, and belongs to the technical field of optical fiber communication, coherent detection and digital signal processing. The method aims to solve the problems of low spectrum efficiency and high calculation complexity caused by dependence on pilot frequency or an iterative feedback process in the existing on-line monitoring technology. The method is characterized by comprising the following steps of: performing fast Fourier transform on a received signal; screening out monitoring frequency points which can be used for damage estimation in a protection band by utilizing local oscillation frequency deviation and signal protection band information; respectively calculating a first estimation parameter and a second estimation parameter based on the frequency domain data of the monitoring frequency point; and directly obtaining an IQ amplitude imbalance estimation value through the first estimation parameter, carrying out linear fitting on the second estimation parameter, and respectively extracting IQ relative time delay and phase imbalance estimation values from the slope and the intercept of a fitting straight line. According to the invention, non-iterative feed-forward online monitoring without a training sequence is realized, and the complexity and power consumption of the system are reduced.

The invention relates to an IQ mixer calibration circuit, a calibration method and a related device, and the first end of a local oscillator of an IQ mixer is connected with the first end of an I-path mixer of the IQ mixer through a first phase shifter; the first end of the local oscillator is connected with the first end of the Q-path mixer of the IQ mixer through the second phase shifter; the second end, connected with the I end of the IQ mixer, of the I-path mixer, the second end, connected with the Q end of the IQ mixer, of the Q-path mixer, the first phase shifter and the second phase shifter are respectively connected to a detection calibration module; and the detection calibration module is used for respectively determining a first phase value of the first phase shifter and a second phase value of the second phase shifter based on a first signal output by the second end of the I-path mixer and a second signal output by the second end of the Q-path mixer. According to the embodiment of the invention, the amplitude and phase imbalance calibration of the IQ mixer can be realized under the condition that a baseband module is not adopted, and the realization complexity is low.

This invention discloses a short-range microwave ranging method based on I / Q signal correction, belonging to the field of microwave ranging and signal processing technology. Addressing the issues of DC bias in I / Q signals caused by receiver non-ideals and clutter reflections, as well as trajectory distortion and demodulation errors caused by unknown amplitude modulation and I / Q amplitude-phase imbalance in microwave phase difference ranging, a correction process combining DC bias estimation and spectral correction is proposed. The method includes: constructing a ratio differential signal incorporating DC bias parameters; establishing an objective function based on elliptic fitting residuals and solving for the DC bias using an optimization algorithm; performing demodulation reconstruction and frequency domain analysis after DC compensation to solve for the amplitude-phase imbalance parameters; correcting the I / Q signals accordingly; and obtaining the target distance change through arctangent demodulation and phase expansion. This application can achieve parameter estimation under any unknown amplitude modulation conditions, improving the accuracy and robustness of short-range ranging.

The invention discloses a power distribution system inter-phase imbalance correction device and method based on energy storage cooperation, and relates to the technical field of power conversion, and the method comprises the steps: collecting inter-phase historical operation data of a power distribution system, and predicting an inter-phase operation curve based on the historical operation data; acquiring an actual inter-phase operation curve of the power distribution system in real time, calculating an error coefficient based on the predicted inter-phase operation curve and the actual inter-phase operation curve, and generating a corrected inter-phase operation curve based on the error coefficient; and on the basis of the correction interphase operation curve, obtaining an interphase imbalance time point and a correction value at a future moment, wherein the imbalance time point and the correction value serve as correction parameters of the energy storage unit. An error coefficient of a predicted interphase operation curve and an actual interphase operation curve is analyzed, a corrected interphase operation curve is generated based on the error coefficient, and an interphase imbalance time point and a correction value at a future moment are extracted from the corrected interphase operation curve, so that the interphase of the power distribution system is corrected in advance, and the failure rate of interphase imbalance is reduced.

1. Name of the product in this design: Microcomputer Motor Protector (YHDB). 2. Application of this design: It is used for multiple protections of motors against overload, short circuit, phase loss and phase imbalance, overvoltage, undervoltage and leakage. 3. The key design features of this product are the combination of shape and color. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. The design for which protection is sought includes color.

The present invention discloses a phase-to-phase imbalance correction device and correction method for a power distribution system based on energy storage collaboration, which relates to the field of power conversion technology and includes: collecting historical phase-to-phase operating data of the power distribution system, and predicting the phase-to-phase operating curve based on the historical operating data; collecting the actual phase-to-phase operating curve of the power distribution system in real time, calculating the error coefficient based on the predicted phase-to-phase operating curve and the actual phase-to-phase operating curve, and generating a corrected phase-to-phase operating curve based on the error coefficient; obtaining the phase-to-phase imbalance time point and correction value at a future moment based on the corrected phase-to-phase operating curve, and using the imbalance time point and correction value as correction parameters for the energy storage unit. By analyzing the error coefficient between the predicted phase-to-phase operating curve and the actual phase-to-phase operating curve, and generating a corrected phase-to-phase operating curve based on the error coefficient, the phase-to-phase imbalance time point and correction value at a future moment are extracted from the corrected phase-to-phase operating curve, thereby performing early correction on the phases of the power distribution system and reducing the failure rate of phase imbalance.

An on-chip variable termination circuit includes a plurality of first tuning circuits and a plurality of second tuning circuits. Each of the first tuning circuits is coupled between a positive signal node of a differential signal port and a voltage node. The first tuning circuits include at least one amplitude tuning circuit and at least one phase tuning circuit. Each of the second tuning circuits is coupled between a negative signal node of the differential signal port and the voltage node. The second tuning circuits include at least one amplitude tuning circuit and at least one phase tuning circuit.

The embodiment of the invention provides a calculation device and a calibration device for imbalance of an optical coherent receiver, and an optical communication system. The calculating device comprises a phase shifter which is arranged on a local oscillation circuit or a signal circuit of an input optical coherent receiver to be detected, the phase shifter carries out at least one phase change of 0-2pi within a preset duration, and the local oscillation circuit and the signal circuit share a laser as a light source; the first calculation unit is used for calculating the average power of the I-path signal, the average power of the Q-path signal and the correlation quantity of the I-path signal and the Q-path signal within the preset duration according to the I-path signal and the Q-path signal output by the optical coherent receiver to be detected; and the second calculation unit is used for calculating the amplitude imbalance and the phase imbalance of the optical coherent receiver to be detected according to the average power of the I-path signal, the average power of the Q-path signal and the correlation quantity of the I-path signal and the Q-path signal in the preset duration.

The embodiment of the invention discloses a filter synchronization signal extraction and phase locking device and method, a storage medium and a terminal, and the device comprises a signal source module which is used for determining a two-phase voltage component according to a three-phase power grid voltage signal; the filtering feedback network is used for filtering the two-phase voltage component according to the corresponding condition of the input frequency and determining a single-frequency waveform component under the current input frequency; the self-adaptive wave trapping module comprises a plurality of self-adaptive wave traps connected in parallel, and the self-adaptive wave traps are respectively used for receiving single-frequency waveform components corresponding to the input frequencies of the self-adaptive wave traps and determining orthogonal signal components under the current input frequency; the synchronous signal extraction module is used for extracting a positive sequence component and a negative sequence component of the orthogonal signal component; and the phase locking module is used for performing phase locking according to the positive sequence component. According to the method, the positive sequence component and the negative sequence component under different input frequencies can be accurately extracted, and the positive sequence component and the negative sequence component can be accurately tracked under severe conditions such as three-phase imbalance of power grid voltage.

A system for phase imbalance calibration, including: an in-phase (I) signal channel including an analog-to-digital converter (ADC) for sampling an I signal to provide a sampled I signal; a quadrature (Q) signal channel including an ADC for sampling a Q signal to provide a sampled Q signal; a sampling clock for controlling the sampling of the ADC on the I signal channel and the sampling of the ADC on the Q signal channel; and sampling clock delay circuitry for adjusting one of a sampling start time of the ADC on the I channel and a sampling start time of the ADC on the Q channel relative to one another such that the sampled I signal and the sampled Q signal are in phase.

A system for phase imbalance calibration, including: an in-phase (I) signal channel including an analog-to-digital converter (ADC) for sampling an I signal to provide a sampled I signal; a quadrature (Q) signal channel including an ADC for sampling a Q signal to provide a sampled Q signal; a sampling clock for controlling the sampling of the ADC on the I signal channel and the sampling of the ADC on the Q signal channel; and sampling clock delay circuitry for adjusting one of a sampling start time of the ADC on the I channel and a sampling start time of the ADC on the Q channel relative to one another such that the sampled I signal and the sampled Q signal are in phase.

The embodiment of the present application discloses a phase-changing method and device based on a phase-changing switch. When the three-phase load is unbalanced, the phases to which each phase-changing switch is currently connected are obtained; all phase-changing schemes are determined according to the number and combination of the phase-changing switches; the three-phase imbalance corresponding to each phase-changing scheme is determined according to the current change of the phase-changing switches in each phase-changing scheme; the phases to which the phase-changing switches in each phase-changing scheme are connected are compared with the phases to which each current phase-changing switch is respectively connected to determine the number of phase-changing switches switched in each phase-changing scheme; each phase-changing scheme is grouped according to the number of phase-changing switches switched; according to the three-phase imbalance, the phase-changing scheme to be selected is determined in each group, and the phase-changing operation is performed based on the phase-changing scheme to be selected to reduce the three-phase imbalance. Through the above method, the number of times the phase-changing switch is operated is reduced, and the service life of the phase-changing switch is extended.

The invention relates to the field of blade tip clearance measurement, in particular to a compensation type displacement high-precision microwave measurement method, by providing a new compensation technology, namely radar orthogonal signal equalization, the radar orthogonal signal equalization method firstly provides a mirror image congruence concept in an I / Q channel self-convolution track space, and the compensation type displacement high-precision microwave measurement method is provided. And a new view angle is provided for compensating amplitude and phase imbalance. The method comprises the following steps of: firstly, estimating a direct-current offset parameter by analyzing accumulated energy of a orthogonal channel; then, based on the mirror image congruence characteristic, an objective function used for compensating parameter estimation is formulated, amplitude-phase imbalance correction is achieved through multiple regression, the parameter estimation performance of the radar orthogonal signal equalization method has robustness for nonlinear modulation and high-order harmonics, and the method is superior to an existing method; and errors and nonlinearity of blade tip clearance measurement are significantly reduced.