22 results about "Phase jitter" patented technology

The invention relates to the technical field of communication, and discloses a network communication chip signal interference suppression processing method. The method comprises the following steps: acquiring a local oscillator phase jitter sequence in real time through an on-chip phase noise monitoring unit; estimating Doppler frequency shift and channel coherence time based on the sequence; dynamically adjusting the closed-loop bandwidth of the phase-locked loop; and generating a phase compensation signal, and performing time-varying channel minimum mean square error equalization in combination with a received baseband signal to eliminate inter-symbol interference. The system integrates a phase noise monitoring function module, a channel parameter estimation function module, a phase-locked loop bandwidth regulation function module, a phase compensation generation function module and an interference joint elimination function module. By means of dynamic bandwidth reconstruction and high-precision phase compensation, the bit error rate under high-speed movement is remarkably reduced, the 5G millimeter wave communication standard requirement is met, and the method has the advantages of being achieved on a whole chip, low in delay and high in robustness.

The invention discloses a multi-entropy source dynamic fusion true random number hardware generation system, which comprises a multi-entropy source acquisition module used for acquiring original entropy signals generated by at least two heterogeneous physical entropy sources in parallel, the heterogeneous physical entropy sources comprising an entropy source based on semiconductor junction thermal noise and an entropy source based on ring oscillator phase jitter; the entropy preprocessing module is used for carrying out adaptive gain adjustment and frequency band filtering on each original entropy signal and converting the original entropy signals into digital bit streams; the entropy source quality evaluation module is used for receiving each digital bit stream in real time and calculating a real-time quality evaluation score of each entropy source based on statistical characteristics of the digital bit streams, i is an entropy source identifier, and t is a time sequence; according to the method, the high randomness, high safety and high reliability of true random number generation can be fundamentally improved.

The invention discloses a scene interference method and device based on pseudo-fuzzy echoes, and the method comprises the steps: obtaining the working mode parameter data of a target object, and constructing a target object parameter database; based on the target object parameter database, processing large-scene image data of a target area to obtain a target pseudo-fuzzy echo interference database; processing target area signal data based on the target pseudo-fuzzy echo interference database to obtain target online interference data; and regulating and controlling the target online interference data to obtain a target online interference signal and transmitting the target online interference signal to a target area. According to the invention, phase jitter is compensated, the influence of phase jitter on interference signals is solved, the physical generation effect of pseudo-fuzzy echoes is guaranteed, and effective interference on a non-cooperative SAR platform is realized.

The invention discloses a high-precision active receiving link phase jitter measurement method, which comprises the following steps of: measuring the phase of the same point frequency signal for multiple times by using an active receiving link, counting a measurement result, obtaining a phase jitter result, analyzing the signal-to-noise ratio of the point frequency signal received by the active receiving link, and calculating the signal phase jitter caused by noise corresponding to the signal-to-noise ratio by using a Cramer-Rao bound formula. And deducting phase jitter caused by noise from a statistical result of dot frequency signal phase measurement to realize accurate measurement of the phase jitter by the active receiving link.

The invention provides an extended target phase offset coherent waveform design and efficient accumulation method. The method comprises the following steps: acquiring a pulse signal of a JFPA waveform received by a target, returning echo signals of a plurality of extended targets, and searching a target coarse velocity by using a minimum envelope entropy, constructing a matching function to perform motion compensation on the echo signal to obtain a two-dimensional time domain signal; taking the jitter initial phase of the echo signal corresponding to the reference waveform as a matched filter, and compensating the jitter initial phase of the echo signal corresponding to the coherent accumulation waveform; and designing the echo signal after initial compensation as a coherent echo signal, and performing Fourier transform on the coherent echo signal along slow time to obtain a coherent accumulation result of the target. According to the method, accurate initial phase jitter compensation is completed without target distance information, the method is suitable for an extended target, and after the echo signal of the JFPA waveform is subjected to initial phase jitter compensation, the phase is controlled to be uniform, so that the complexity of FFT coherent processing can be reduced.

The application relates to the technical field of underwater communication and signal processing, and provides an anti-interference method for underwater power carrier communication, which comprises the following steps: acquiring a power carrier time-frequency signal received by an SRM and synchronously collecting a control instruction stream, wherein the power carrier time-frequency signal is an OFDM signal; determining a state perception weight matrix based on a relay action time window, wherein the relay action time window is determined based on the control instruction stream; determining a joint optimization problem provided with a phase distortion correction operator based on the power carrier time-frequency signal, the state perception weight matrix and a frequency domain confidence matrix in combination with a double-weighted robust principal component analysis algorithm, wherein the frequency domain confidence matrix is determined based on the high-frequency attenuation characteristics of an underwater umbilical cable; and solving the joint optimization problem based on a linearized alternating direction multiplier method to determine a target power carrier signal. The application solves the problem that reliable communication cannot be realized under the double constraints of strong interference and severe phase jitter in the related art.

The invention discloses a multi-mode control switching method for a robot servo system, relates to the technical field of control switching, and is used for solving the problem that the control quantity received by an execution layer at the moment of control mode switching is discontinuous. Collecting a control instruction output frequency of a current control mode controller, calculating an output stability factor based on an output frequency sequence, and when the output stability is insufficient, introducing a log write-in proportion of a control software operation level and calculating a phase jitter density; the mode switching process is subjected to conjoint analysis from the two sides of control output behavior and software state activity, the switching impact time delay is calculated by combining the historical instantaneous switching behavior characteristics of the mode to be switched and the amplitude limiting trigger duration of the controller, the default transition duration interval is subjected to targeted adjustment, and the mode switching time delay is calculated. And the mode switching smoothness and the operation reliability in a complex operation scene are improved.

This invention discloses a multi-mode control switching method for robot servo systems, relating to the field of control switching technology. It addresses the problem of discontinuous control quantities received by the execution layer during control mode switching. By identifying that the robot is in a control mode switching state, the method collects the output frequency of the controller's control commands for the current control mode and calculates an output stability factor based on the output frequency sequence. When output stability is insufficient, it introduces the log writing ratio at the control software runtime level and calculates the phase jitter density. The method jointly analyzes the mode switching process from two perspectives: control output behavior and software state activity. Combining the historical instantaneous switching behavior characteristics of the mode to be switched with the controller's limiting trigger duration, it calculates the switching impact delay and adjusts the default transition duration range accordingly, improving the smoothness and reliability of mode switching in complex operating scenarios.

The present application relates to a kind of system for realizing large-scale MIMO transceiver phase calibration function, including MIMO transceiver, signal source and vector network analyzer, when the transmitting phase of MIMO transceiver is calibrated, the output end of signal source is connected with first port, and transmitting channel TX1-TXn of MIMO transceiver is connected to second port one by one;When the receiving phase of MIMO transceiver is calibrated, one-way output of two-way power divider is connected to first port, and other-way output is connected to receiving channel RX1-RXn of MIMO transceiver one by one.The present application also relates to a kind of method for realizing large-scale MIMO transceiver phase calibration processing, device, processor and storage medium.The system for realizing large-scale MIMO transceiver phase calibration function, method, device, processor and its computer readable storage medium of the present application solve that the phase error caused by large-scale MIMO system itself reference channel phase jitter is larger, and the reliability problem of phase calibration value, ensure the phase consistency of large-scale MIMO transceiver system.

The invention provides an AC voltage phase jitter error compensation system and method based on differential sampling, and the system is characterized in that a to-be-detected AC source is connected with one side of a self-made double-pole double-throw switch; the common end of the double-pole-double-throw switch is connected with the low end of the digital-to-analog conversion board card serving as the voltage standard and the low end of the transformed sampling voltmeter. Two groups of reference signals sent by the rubidium clock are respectively connected to external reference clocks of the two groups of arbitrary waveform generators and external reference signals of the digital-to-analog conversion board card through the self-made optical isolator; the group of arbitrary waveform generators are respectively connected with an external phase-locked end of the AC signal calibration source to be tested, the transformed sampling voltmeter and a trigger signal end of the standard digital-to-analog conversion board card through three optical isolators; and the other group of arbitrary waveform generator is connected with an external reference signal end of the sampling voltmeter through a self-made optical isolator. According to the invention, measurement errors caused by phase jitter can be effectively compensated, so that the accuracy of high-frequency AC voltage magnitude transmission is improved.

The application discloses a low-voltage power supply pile management method and system, relates to the technical field of intelligent power supply pile management, and samples through a signal sampling and processing module at a high frequency greater than 50 kHz, and constructs an original current set and a preprocessing set, so that subtle disturbances and nonlinear fluctuation characteristics in a power supply process can be accurately captured, the technical limitation that only 'exceeding the limit can be identified' is broken from the root, and the capacity of discovering abnormal signal rudiment in advance is possessed. The ripple feature extraction module constructed by the system not only identifies the ripple density change in the current, but also fuses information in multiple dimensions such as frequency spectrum energy discreteness and phase jitter intensity, and forms a micro-disturbance feature set. Different from the traditional method of only paying attention to the mean value or the peak value, the system identifies the structural change and the continuity change of the disturbance through multiple angles, greatly enhances the identification capacity of the system to the implicit problem in the complex disturbance scene, and improves the resolution and sensitivity of the electrical behavior identification.

The embodiment of the invention provides a random number generation circuit, a chip and a chip module. The circuit comprises a plurality of delay units and an output unit, the plurality of delay units are connected in series to form an annular loop and used for generating oscillation signals, and for each delay unit in the plurality of delay units, the first input end of the delay unit is connected with the output end of the last-stage delay unit of the delay unit, and the second input end of the delay unit is connected with the output end of the last-stage delay unit. The output end of each delay unit is connected with the first input end of the next-stage delay unit, the second input end of each delay unit is connected with the output end of the next-stage delay unit, and the output unit is connected with the output ends of the delay units and used for outputting random numbers according to output signals of the delay units. According to the circuit provided by the embodiment of the invention, by introducing a local feedback mechanism for feeding back the output of the latter stage of delay unit to the former stage of delay unit, multi-stage immediate feedback and efficient collection and amplification of phase jitter can be realized, the entropy of an output signal is remarkably improved, and the quality of a random number is improved.

The invention relates to the cross technical field of integrated circuits and neural engineering, discloses an in-memory adaptive clock synchronization method and chip for a multi-mode brain-computer interface signal, and aims to solve the problems of large phase jitter, high power consumption and slow dynamic response caused by large sampling rate difference and dependence on an external non-adaptive phase-locked loop in the prior art. According to the method, instantaneous energy features of high-frequency electroencephalogram signals are extracted in real time in a storage and calculation integrated feature extraction array, phase adjustment control signals are generated through an energy-to-phase module, and a local ring oscillator is dynamically adjusted to generate a self-adaptive low-frequency sampling clock which is used for triggering sampling of low-frequency near-infrared spectrum signals and binding a high-precision timestamp. The system comprises a near infrared spectrum signal acquisition module, a storage and calculation integrated feature extraction array, an energy-to-phase module, a digital control ring oscillator, a timestamp generation module and a state synchronization control module. According to the invention, through a storage and calculation integrated closed-loop feedback mechanism, sub-picosecond-level synchronization precision, ultra-low power consumption and high-sensitivity response to key neural events are realized.

The invention discloses a ring oscillator based on multi-phase coupling calibration, which belongs to the technical field of radio frequency integrated circuit design and comprises three mutually coupled oscillation loops based on three-stage delay units and calibration loops among the oscillation loops. In the structure, an input node of a delay unit of each oscillation loop is connected with a calibration unit of a calibration loop, when phases at two ends of the calibration unit are inconsistent, oscillation loop current is redistributed through the calibration unit, and phase alignment is realized through a current real-time compensation mechanism; after the three oscillation loops are mutually coupled, phase jitter caused by external noise disturbance of any oscillation loop can be fed back to the other two oscillation loops through the calibration loop, so that automatic compensation and equalization of phase errors are realized in the whole system, and the phase noise of each oscillation loop is effectively reduced. Meanwhile, the dynamic phase calibration mechanism of the three oscillation loops significantly enhances the single event effect resistance of the circuit.

The application relates to the field of communication technology and discloses a network communication chip signal interference suppression processing method.The method comprises the following steps: collecting a local oscillator phase jitter sequence in real time through an on-chip phase noise monitoring unit; estimating a Doppler frequency shift and a channel coherence time based on the sequence; dynamically adjusting a phase-locked loop closed loop bandwidth; generating a phase compensation signal and jointly performing time-varying channel minimum mean square error equalization on the received baseband signal to eliminate inter-symbol interference.The system integrates five function modules of phase noise monitoring, channel parameter estimation, phase-locked loop bandwidth regulation, phase compensation generation and interference joint elimination.The application significantly reduces the bit error rate under high-speed movement through dynamic bandwidth reconstruction and high-precision phase compensation, meets the requirements of the 5G millimeter wave communication standard, and has the advantages of full-chip implementation, low delay and high robustness.

The application provides a double feedback integral type bit synchronization loop and bit synchronization method of a digital communication system, which triggers a filter feedback loop and a threshold feedback loop to independently generate a filter feedback loop local bit synchronization signal clock signal and a threshold feedback loop local bit synchronization signal clock signal according to a local clock and an input signal; and then selects one of the outputs according to the state of the filter feedback loop. Thus, the application can use the filter feedback loop to avoid the possible non-convergence of the threshold feedback loop caused by inaccurate threshold setting; and correspondingly, after the filter feedback loop successfully captures and enters a phase-locked state, the synchronization clock of the threshold feedback loop is switched, so that the phase jitter problem caused by the continued use of the filter feedback loop in the phase-locked state is avoided through the threshold feedback loop.

The application aims at solving the technical problem that the time resolution of the system is difficult to break through the technical barrier of 100 femtoseconds due to the phase jitter between the radio frequency field and the pump laser in the prior art, and providing an ultrafast electron pulse non-jitter static magnetic time compression device and compression method; the device comprises a femtosecond laser, an ultrafast electron gun, an electron beam collimation transmission assembly, an Omega type static magnetic time compression assembly, an electron beam aberration correction and final stage focusing assembly and a sample cavity which are sequentially arranged on the light output path of the femtosecond laser; the Omega type static magnetic time compression assembly is used for introducing an energy related time delay to the ultrafast electron pulse, compensating the initial time chirp of the electron pulse, and compressing the pulse width of the ultrafast electron pulse to below 100 femtoseconds. In the process of electron pulse acceleration and pulse compression, the device does not need to consider the time jitter between the radio frequency field and the femtosecond laser, and can maximize the time resolution of the ultrafast characterization instrument.

The invention provides a flexible DC power transmission control protection system and a communication control method thereof, and the method comprises the steps: carrying out the local clock reference configuration based on the transmission demands of to-be-transmitted data in the flexible DC power transmission control protection system, and determining the transmission frame gap of the to-be-transmitted data in the Ethernet; generating a plurality of data frames based on the to-be-transmitted data in combination with the frame gap and a preset frame structure; bypassing a TCP / IP (Transmission Control Protocol / Internet Protocol) protocol stack, and packaging the plurality of data frames into a plurality of corresponding transmission frames through a naked MAC (Media Access Control) frame injection and static MAC binding mechanism; and scheduling and transmitting the plurality of transmission frames by adopting a time sequence control mechanism. Through clock reference configuration and a frame gap, a plurality of data frames are enabled to pass through a naked MAC frame injection and static MAC binding mechanism, so that formed transmission frame time sequences are the same, transmission of the transmission frames is enabled to be stable, signal rising / falling edge time sequence offset caused by clock phase jitter can be overcome, a sampling point of a receiving end is enabled not to be deviated, and error rate is reduced.

This invention relates to the field of avionics bus testing and modular instrument technology, specifically to an automated functional testing system for avionics buses based on a modular instrument architecture. The system includes a communication acquisition node, a backplane transmission channel with a first-in-first-out buffer, a low-level bus probe, a status acquisition module, a congestion quantization module, a strategy generation module, and an adaptive scheduling module. The status acquisition module acquires memory access channel occupancy, trigger synchronization clock phase jitter parameters, and system interrupt response differences. The congestion quantization module uses weighted summation to obtain the system's micro-congestion entropy index. The strategy generation module generates full-load concurrent injection, local frequency reduction, or backbone communication deterministic protection strategies based on a first risk threshold and a second limit threshold. The adaptive scheduling module uses feedback sampling to adjust control quantities, correcting the time difference between excitation transmission and response reception, and improving timing reliability in high-concurrency closed-loop testing.

The invention belongs to the technical field of GNSS ionosphere scintillation monitoring, and relates to a double-frequency GNSS ionosphere phase scintillation calculation method and system, and the method comprises the steps: obtaining carrier phase observation data and channel tracking state information collected by a GNSS receiver, and extracting effective carrier phase observation data; subtracting the effective carrier phase observation data of the two different frequency points at the same moment to obtain a difference value; ionosphere delay which changes slowly is removed through polynomial fitting, and a phase jitter measurement value caused by ionosphere flicker is obtained; and calculating the ionosphere phase flicker index according to the phase jitter measurement value. According to the invention, the problems of unstable calculation and large calculation resource consumption caused by digital filtering can be effectively solved; the method does not depend on a receiver clock with high stability; meanwhile, the influence of clock adjustment of the receiver can be directly eliminated through the original data of the receiver, and the related information of clock adjustment in the receiver does not need to be obtained.

The invention relates to the technical field of unmanned aerial vehicle navigation, in particular to an unmanned aerial vehicle autonomous navigation control method in a strong electromagnetic environment. Acquiring an original electromagnetic interference signal containing broadband power spectrum density distribution, a pulse interference timestamp sequence and a specific frequency point phase jitter characteristic in a flight airspace; generating an interference source distribution thermodynamic diagram through an electromagnetic environment feature analyzer, and fusing inertial navigation attitude data to construct an electromagnetic situation awareness constraint field; performing dynamic topology reconstruction on a global route according to the constraint field, generating a local route segment set avoiding a high-interference sector, and marking an electromagnetic safety margin level; and combining a ground feature point image sequence acquired by the optical auxiliary positioning module with the local route segment set to carry out space registration, and generating a composite navigation guide instruction. The method can effectively adapt to a strong electromagnetic environment, and the stability and accuracy of autonomous navigation of the unmanned aerial vehicle are improved.

The application discloses a phase jitter compensation method, a module and a digital phase-locked loop. The phase jitter compensation method comprises the following steps: acquiring a phase error signal of the digital phase-locked loop in a current period and a phase error signal of an adjacent previous period, and determining duty cycle mismatch information according to the phase error signal in the current period and the phase error signal of the adjacent previous period, wherein the phase error signal comprises a digital signal formed by a difference between an input reference signal phase and a feedback signal phase; generating current phase compensation information according to the duty cycle mismatch information; correcting the phase error signal in the current period by using the current phase compensation information, and sending the corrected phase error signal to the digital phase-locked loop, so as to re-perform phase tracking according to the corrected phase error signal. The technical scheme of the embodiment of the application can improve calibration accuracy and reduce the area of a circuit required for calibration.