3results about How to "Improve waveform" patented technology

The invention relates to the technical field of high-voltage cable fault detection, and provides a low-sampling high-voltage cable fault positioning method based on head edge correction and waveform quality weighting. The method comprises the following steps: deploying low-power-consumption wave recording terminals at two ends or key nodes of a high-voltage cable joint so as to collect a timestamp sequence when a high-voltage cable fault occurs; calculating a first edge slope, a signal-to-noise ratio and oscillation symmetry triggered by the first edge; calculating a waveform quality correction coefficient of the first edge based on the slope of the first edge, the signal-to-noise ratio of the signal and the oscillation symmetry; based on the timestamp sequence, screening subsequent timestamps strongly associated with the first edge by taking the first edge timestamp as a reference to obtain an effective timestamp sequence; and taking the first edge as a positioning reference, performing fitting correction on the deviation of the first edge by using the effective timestamp sequence and combining the waveform quality correction coefficient of the first edge to obtain a corrected first edge time difference, and further obtaining a fault position through a double-end positioning method.

This invention discloses a dynamic calibration device for a frequency-adjustable variable cross-section gas flow meter, belonging to the field of gas flow metering technology. The device includes a variable frequency motor, a rotary valve, a fan, a rectifier, a stabilizing section, a contraction section, a development section, and a testing section connected in sequence. The rotary valve consists of a stator and a rotor; the rotor rotation causes the flow cross-sectional area to change sinusoidally, generating a standard sinusoidal flow signal. The variable frequency motor is used to adjust the rotor speed, achieving precise control of the signal frequency. The fan provides suction power. The rectifier, stabilizing, contraction, and development sections are used to ensure the airflow reaches a fully developed laminar flow state. The testing section measures the pressure gradient using a dynamic pressure sensor. This invention also provides a method for obtaining a standard volumetric flow signal by solving the analytical solution of the Navier-Stokes equations based on the pressure gradient. This device solves the problems of difficulty in controlling the generation of dynamic flow signals and the difficulty in directly tracing the source of standard flow, achieving high-precision calibration of the dynamic characteristics of the gas flow meter.

The application relates to a radar waveform design method and device, computer equipment and a storage medium. The method comprises the following steps: determining a target echo signal according to a radar receiver; constructing a radar echo optimization model by taking the waveform energy and the waveform equivalent bandwidth of the target echo signal as design variables and maximizing the echo signal-to-noise ratio as an optimization target; discretely decomposing the radar echo optimization model to obtain a discrete optimization model; approximating the discrete optimization model by using the Dirac-Bach rule to obtain a second-order cone programming model; iteratively solving the second-order cone programming model by using a second-order cone programming algorithm to obtain a transmission waveform power spectrum of the radar echo optimization model; and synthesizing the transmission waveform power spectrum by using a phase recovery algorithm to obtain a radar optimization time-domain waveform. The method can overcome the problem of performance loss of a heuristic signal-to-noise ratio and guarantee the high-precision requirements of target tracking and measurement.