33results about How to "Achieving Phase Synchronization" patented technology

The invention discloses a multi-channel high-speed digital-to-analogue converter (DAC) synchronization method, which comprises the following steps of: first generating a digital signal source reference signal, a synchronous clock signal and a resetting signal by using a field programmable gate array-MASTER (FPGA-MASTER), simultaneously transmitting the signals to an FPGA-SLAVEP and a DACM, and roughly adjusting multi-path delay, wherein P and M are positive integers; then performing FPGA-MASTER synchronous clock phase discrimination in the FPGA-SLAVEP, and regulating a phase difference to 0 by using a fine delay module; and finally performing DACM reference clock phase discrimination in the FPGA-SLAVEP, and regulating a phase difference to 0 by using the fine delay module. Output signals can be subjected to phase synchronization, a plurality of FPGAs and a plurality of high-speed DACs can be simultaneously cascaded without the limitation of clock speed of the DACs, and FPGA-SLAVEPs are used for performing phase discrimination and phase regulation on the FPGA-MASTER and the DACs to make the phases of data of the FPGA-MASTER, the FPGA-SLAVEs and the DACs consistent, so that the time sequence of each path of DAC is completely synchronous and controllable, working efficiency is improved, and a signal output bandwidth is expanded.

The invention discloses a phase synchronization method comprising that a second synthetic aperture radar (SAR) receives a first phase synchronization signal transmitted by a first SAR to obtain a first received signal; the first SAR receives a second phase synchronization signal sent by the second SAR to obtain a second received signal; a peak phase difference between the first received signal andthe second received signal is determined, and a compensation phase is determined according to the peak phase difference according to a first preset rule; phase compensation is performed on an echo signal generated by a radar signal transmitted by the first SAR and received by the second SAR according to the compensation phase. The invention also discloses a phase synchronization device, a storagemedium and an information processing device.

The invention discloses a four-phase reflection type coherent optical communication system, and belongs to the technical field of optical communication systems. The optical communication system comprises a laser, a reflective optical modulator, a polarization controller, a 3dB coupler, a polarization beam splitter, a homodyne coherent receiver, a digital signal processing module and an adder. According to the reflection type coherent optical communication system provided by the invention, the self-coherent demodulation technology is adopted, the signal light and the local oscillation light arefrom the same light source, the wavelength tracking of the local oscillation laser is realized without closed-loop feedback in a traditional coherent optical communication system, and the receiving part is relatively simple.

The invention discloses a time division power multiplier and an implementation method thereof. The time division power multiplier comprises a voltage processing circuit, a current processing circuit,an analog switch, a filter and a V / f converter. The voltage processing circuit comprises a conditioning circuit 1, a phase synchronization circuit, a triangular wave generator and a pulse width modulation circuit. According to the invention, using signal conversion and phase locking technologies, a measured signal and a triangular wave generator of a time division multiplier are subjected to related processing, the triangular wave generator of the time division power multiplier is synchronized with the whole period of a measured signal, and the phase difference in conversion of the product oftwo measured alternating current quantities is reduced, so that the accuracy of a power / electric energy measurement result is improved, and the accuracy of the measurement technology of the time division power multiplier is improved to meet most active power / electric energy measurement requirements.

The invention discloses a multi-channel high-speed digital-to-analogue converter (DAC) synchronization method, which comprises the following steps of: first generating a digital signal source reference signal, a synchronous clock signal and a resetting signal by using a field programmable gate array-MASTER (FPGA-MASTER), simultaneously transmitting the signals to an FPGA-SLAVEP and a DACM, and roughly adjusting multi-path delay, wherein P and M are positive integers; then performing FPGA-MASTER synchronous clock phase discrimination in the FPGA-SLAVEP, and regulating a phase difference to 0 by using a fine delay module; and finally performing DACM reference clock phase discrimination in the FPGA-SLAVEP, and regulating a phase difference to 0 by using the fine delay module. Output signals can be subjected to phase synchronization, a plurality of FPGAs and a plurality of high-speed DACs can be simultaneously cascaded without the limitation of clock speed of the DACs, and FPGA-SLAVEPs are used for performing phase discrimination and phase regulation on the FPGA-MASTER and the DACs to make the phases of data of the FPGA-MASTER, the FPGA-SLAVEs and the DACs consistent, so that the time sequence of each path of DAC is completely synchronous and controllable, working efficiency is improved, and a signal output bandwidth is expanded.

The application discloses a method and system for phase synchronization of a digital lock-in amplifier. The method includes: the phase adjustment module obtains an adjustment enable signal, and enters an adjustment mode based on the adjustment enable signal; Measure the result, and adjust the first phase signal to the second phase signal; the sinusoidal signal generator generates the first sinusoidal signal based on the second phase signal; A sinusoidal signal is multiplied; the low-pass filter filters out the high frequency in the result of multiplying the signal output by the delay unit output by the multiplier and the first sinusoidal signal, and outputs the second measurement result; after a preset period of time, the phase adjustment module, A second measurement of the output of the low pass filter is recorded and the phase adjustment value is updated. The present application can effectively realize the phase synchronization of the digital lock-in amplifier and reduce resource consumption.

The invention relates to the technical field of wireless communication, and discloses a device for clock signal recovery. The device includes: a differential input signal module which is used for acquiring antenna voltage and generating a differential input signal according to the antenna voltage; a pre-amplification module, wherein the first end of the pre-amplification module is electrically connected with one end of the differential input signal module, and the pre-amplification module is used for amplifying the differential input signal; a comparator, wherein one end of the comparator is electrically connected with the second end of the pre-amplification module, and the comparator is used for comparing the amplified differential input signals to obtain clock signals; and a negative feedback module, wherein the first end of the negative feedback module is electrically connected with the other end of the differential input signal module, the second end of the negative feedback module is electrically connected with the third end of the pre-amplification module, the third end of the negative feedback module is electrically connected with the other end of the comparator, and the negative feedback module is used for adjusting an amplification parameter of the differential input signal according to the clock signal so as to recover the clock signal. The invention also discloses a method for clock signal recovery.and an NFC chip.

The invention discloses an optical fiber phase synchronization system based on optical active compensation, comprising: a frequency reference, a phase-locked frequency multiplier, a pulse generator, a laser, a 1×2 optical coupler, a polarization scrambler, a circulator, and an optical delay line , optical fiber, demultiplexer, photodetector, radio frequency amplifier, pulse distribution amplifier, radio frequency power divider, phase detector, time interval counter, delay processing unit, drive circuit. The present invention can ensure that the frequency signal phases are consistent under operations such as shutdown and restart or optical fiber routing change, and realize phase synchronization, thereby improving the coherence of time-frequency transmission and meeting the requirements of coherent detection applications such as distributed radar arrays.

A clock synchronization method for devices in a local area network. Based on the design idea of ​​IEEE 1588 protocol, it collects the clock information of each device in the time management unit through the round-trip message; calculates the phase deviation and the frequency correction coefficient of the device according to the time of each device and the information of the time management unit; The frequency correction coefficient is associated with the device number to generate a relative time deviation list, which is sent to each device that needs to be synchronized; the device queries the relative deviation time list according to its own device number and the destination device number to obtain the frequency correction coefficient of the device and the time difference between the device and the destination device. The relative time deviation can realize the synchronization of the clock phase and the correction of the frequency. The invention not only optimizes the problem of heavy load caused by the IEEE 1588 protocol synchronization process and the possible long clock synchronization execution period, but also proposes a list-based clock frequency synchronization method during the time synchronization process.

The invention discloses a time-division power multiplier and its realization method. The time-division power multiplier includes a voltage processing circuit, a current processing circuit, an analog switch, a filter and a V / f converter, and the voltage processing circuit includes a conditioning circuit 1. Phase synchronization circuit, triangular wave generator and pulse width modulation circuit. The present invention uses signal conversion and phase-locking technology to correlate the measured signal with the triangular wave generator of the time-division power multiplier, and realize the synchronization of the triangular wave generator of the time-division power multiplier with the entire period of the measured signal, so that the two The phase difference in the transformation of the measured AC product is reduced, thereby improving the accuracy of the power / electric energy measurement results, and improving the accuracy of the time-division multiplier measurement technology to meet most active power / electric energy measurement requirements.

The present invention provides a phase synchronization method, device and terminal, which relate to the technical field of time service. The phase synchronization method includes: sending a first clock signal to a receiving device; detecting the first clock signal and the third clock sent by a zero-delay module The phase difference of the signal; through the zero delay of the second clock signal, and the second clock signal is fed back to the timing device; the ratio of the first path delay and the second path delay is also set as a preset value, according to the preset Set the value and the phase difference to obtain the phase-shifting phase value; realize the phase-shifting of the second clock signal according to the phase-shifting phase value, thereby realizing the phase alignment of the first clock signal and the output signal; the present invention can realize the output signal of the timing device and the output of the receiving device The phase synchronization of the signal reduces the error introduced by the phase and improves the timing accuracy.

The present application relates to the technical field of wireless communication, and discloses a device for recovering a clock signal. Including: a differential input signal module, which is used to obtain the antenna voltage and generate a differential input signal according to the antenna voltage; a pre-amplification module, the first end of which is electrically connected to one end of the differential input signal module; the pre-amplification module is used to amplify the differential input signal; A comparator, one end is electrically connected to the second end of the pre-amplification module, the comparator is used to compare the amplified differential input signal to obtain a clock signal; the negative feedback module, the first end is electrically connected to the other end of the differential input signal module, The second end of the negative feedback module is electrically connected to the third end of the pre-amplification module, and the third end of the negative feedback module is electrically connected to the other end of the comparator; the negative feedback module is used to perform the amplification parameter of the differential input signal according to the clock signal adjustment to achieve recovery of the clock signal. The application also discloses a method for recovering a clock signal and an NFC chip.

The invention discloses a method for measuring and compensating a power quality device. The method comprises the steps of: obtaining the fundamental wave and harmonics of the power quality device after harmonic analysis; obtaining the theoretical conversion coefficient of voltage and the theoretical conversion coefficient of current; obtaining the automatic Calibrate the voltage amplitude compensation coefficient, automatically calibrate the current amplitude compensation coefficient, automatically calibrate the voltage phase compensation coefficient and automatically calibrate the current phase compensation coefficient; obtain the voltage interval amplitude compensation coefficient and the current interval amplitude compensation coefficient; obtain the voltage frequency phase compensation coefficient and current frequency phase compensation coefficient; obtain the voltage temperature amplitude compensation coefficient and current temperature amplitude compensation coefficient; calculate the amplitude and phase of the compensated fundamental wave voltage, the amplitude and phase of the compensated fundamental wave current, and the compensated harmonic The amplitude and phase of the voltage, the amplitude and phase of the compensated harmonic current. The invention can realize the phase synchronization of the power quality device and effectively improve the measurement accuracy of the power quality device.

The invention provides an FMCW SAR phase synchronization method based on distributed satellites. The method comprises the following steps: at any time t, emission satellite output signals are emitted after being respectively subjected to K frequency multiplication and N frequency multiplication; and then frequency mixing with carrier frequency signals is carried out after M frequency multiplication, and emission-end carrier wave phase differences are obtained through frequency spectrum peak extraction. One path of receiving satellite output signals are subjected to frequency mixing with echo signals after K frequency multiplication, and thus dual-station echo signals are obtained; one path of the receiving satellite output signals are emitted after M frequency multiplication; and one path of the receiving satellite output signals are subjected to frequency mixing with the received emission signals after N frequency multiplication, and receiving-end carrier wave phase differences are obtained through frequency spectrum peak extraction. According to the invention, the emission-end carrier wave phase differences and the receiving-end carrier wave phase differences at any time t can be obtained by use of such a process, and compensation phases of the dual-station echo signals are obtained after difference processing is performed on the emission-end carrier wave phase differences and the receiving-end carrier wave phase differences. According to the invention, the measurement frequency of the carrier wave phase differences can be improved, and the phase synchronization precision is improved.

The invention discloses a phase synchronization method. A second Synthetic Aperture Radar (SAR) receives a first phase synchronization signal sent by a first SAR to obtain a first received signal; the first SAR receives a signal sent by the second SAR The second phase synchronization signal of the second received signal to obtain the second received signal; determine the peak phase difference between the first received signal and the second received signal, and determine the compensation phase according to the peak phase difference using a first preset rule; according to the Compensating the phase, performing phase compensation on the echo signal received by the second SAR and generated by the radar signal transmitted by the first SAR. The invention also discloses a phase synchronization device, a storage medium and an information processing device.

The invention discloses a high-precision optical fiber time transmission system which comprises a local reference frequency signal generation module, a local trigger time signal generation module, a local high-precision time frequency synchronization module, a local time frequency transmission device, a local return time frequency synchronization module, a far-earth time frequency transmission device and a far-earth high-precision time frequency synchronization module. The system is based on a high-precision time signal generation and transmission technology of time frequency signal phase synchronization. Phase locking of the demodulated and recovered time signal and the demodulated and recovered frequency signal is achieved through the high-precision time-frequency synchronization module,a low-jitter time signal synchronous with the phase of the frequency signal in real time is generated, and transmission of the high-precision time signal is achieved while the time signal is output.Meanwhile, the invention provides a high-precision optical fiber time transmission method. According to the invention, the phase locking of the rising edge of the time signal and the sine frequency signal is realized, and the high-stability frequency signal is utilized to generate the low-jitter time signal synchronous with the phase of the high-stability frequency signal, so that the high-precision transmission of the time signal is realized.

The invention relates to an integrated circuit bypass signal difference amplification sampling system and an acquisition method. The sampling system comprises a control unit and a collection unit; the control unit is connected to a collection unit through a first data port for controlling the collection process of the collection unit, transmitting a collection stop signal, regulating delaying parameters and filter parameters, receiving collected a digital bypass signals, and performing data interaction with the upper computer through the second data port; the collection unit comprises a first test socket for inserting the detected integrated circuit chip, a second test socket for inserting the safety chip, a difference amplifier, a band pass filter, an analog-to-digital converter and a second data port; and the first test socket and a second test socket are commonly connected to the same set of the periphery circuit. The integrated circuit bypass signal difference amplification sampling system and acquisition method can obtain the dynamic high accuracy bypass signal of the integrated circuit chip, can effectively inhibit the interference of the logic noise, gets rid of the dependence on the high accuracy oscilloscope, and improves the collection accuracy and collection efficiency on the integrated circuit.

The invention provides a phase synchronization detection method and device based on IPT parallel multi-inverter, the device includes n inverter modules, one inverter module is the main inverter module, and the other n-1 inverter modules The inverter module is a slave inverter module; n drive circuits are respectively connected with n external coupled inductors ICT i Parallel connection, 1≤i≤n; each drive circuit includes 4 half-bridge switching arms, 4 half-bridge switching arms are respectively connected with 4 coupling inductors ICT ij Parallel connection, 1≤j≤4; the present invention reflects the synchronous state of the inverter voltage phase according to the error between the inverter output phase and the average value of all output phases, and adjusts the output voltage phase, thereby realizing multiple parallel connections. The function of phase synchronization of inverters and correct measurement of voltage phases of multiple inverters in parallel.

A four-phase reflective coherent optical communication system belongs to the technical field of optical communication systems. The optical communication system includes a laser, a reflective optical modulator, a polarization controller, a 3dB coupler, a polarization beam splitter, a homodyne coherent reception, a digital signal processing module and an adder. The reflective coherent optical communication system provided by the present invention adopts the self-coherent demodulation technology, the signal light and the local oscillator light come from the same light source, and does not need the closed-loop feedback in the traditional coherent optical communication system to realize the wavelength tracking of the local oscillator laser , the receiving part is relatively simple.

The invention relates to a method, a device and a system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules. The method comprises steps of collecting three phase input current of a first rectification power supply module to obtain ring current between the first rectification power supply module and a second rectification power supply module; obtaining a phase difference of triangular carrier signals of the first rectification power supply module and the second rectification power supply module according to the ring current; calculating a carrier compensation delay time according to the carrier phase difference; and adjusting a phase of the triangular carrier signal of the first rectification power supply module according to the carrier compensation delay time so as to synchronize phases of the triangular carrier signals of the first rectification power supply module and the second rectification power supply module. The invention can effectively inhibit ring current between two rectification power supply modules, balances loads of the two rectification power supply modules, and improves safety and stability of a power distribution network.