3 results about "Phase time" patented technology

The application discloses a phase compensation method of a multifunctional electric power digital display instrument, relates to the technical field of phase compensation, and is used for improving the incompatible problems of phase differences of various detection circuits in the multifunctional electric power digital display instrument, and comprises the following steps: detecting a correction environment, obtaining a normal power frequency period of a reference signal, setting a power frequency locking experiment in the correction environment to determine the power frequency of the reference signal, calculating the power frequency period according to the power frequency of the reference signal, setting the number of oversampling, calculating a sampling interval by using a geometric mean method according to the power frequency period and the number of oversampling, calculating a sampling point interval difference after the sampling interval is determined, obtaining historical data, comprehensively using the historical data and the sampling point interval difference to select direct compensation or time delay adjustment by using fuzzy reasoning, detecting channel noise when the time delay adjustment is selected, collecting phase differences of various channels, converting the phase differences into phase time differences, and completing phase compensation according to the phase time differences.

This invention discloses a multi-stage time synchronization method for a structural health monitoring array, comprising: preprocessing a floor acceleration signal with unknown time delay; calculating the initial delay of the floor acceleration signal based on cross-correlation; calculating the residual time delay of the floor acceleration signal based on wave propagation constraints; calculating the residual time delay of the floor acceleration signal based on cross-spectral phase; reconstructing the synchronized floor acceleration signal using the initial delay, residual time delay, and residual time delay; calculating the displacement response through integration; and outputting the inter-story displacement. This invention divides the synchronization process into three sequential stages: the first stage rapidly reduces the large time delay to the order of several vibration periods; the second stage further refines the process, controlling the residual time delay within one period; and the third stage utilizes phase information to achieve high-precision synchronization while limiting the frequency range to avoid the influence of high-frequency noise.

The invention discloses a frequency agility frequency synthesizer system capable of keeping phase consistency, relates to the technical field of frequency synthesis, and forcibly constrains an originally asynchronous and random frequency updating request to a determined time node generated by a frequency dividing circuit. And the frequency of the synchronous trigger signal becomes a common divisor of all preset output frequencies, namely the output frequency and the trigger frequency are in an integral multiple relationship. No matter when the system sends out a frequency hopping instruction, the actual frequency switching action is always standardized at the determined zero-phase time points, so that the phase randomness introduced due to uncertain instruction arrival time is eliminated, the phases of output signals are strictly consistent in any two processes of hopping from the same frequency to the same frequency, and the frequency hopping efficiency is improved. And phase maintenance and repeatability are realized.