4results about How to "Accurate amplitude" patented technology

The invention discloses a phased-array antenna calibration test method and system and a storage medium, and belongs to the technical field of phased-array antennas. When the phased-array antenna is calibrated, an upper computer, a wave controller and a vector network are converted into instantaneous pulses of a hardware circuit through information interaction of a specific protocol and a complex process. A Flash storage chip and an FPGA chip are arranged in the wave control box, before a phased-array antenna is prepared for calibration testing, an upper computer writes a calibration instruction set into the Flash of the wave control box, and a vector network is set to be in an external trigger mode. In the calibration process, the condition that the upper computer sends a calibration instruction to the wave controller and the wave control box analyzes the calibration instruction and then issues the calibration instruction is avoided, but the wave control box directly sends the calibration instruction and triggers the vector network, and the vector network collects and caches data. And after receiving a calibration completion command sent back by the wave control box, the upper computer reads the cached data at one time through the vector network FIFO function and then analyzes and displays the cached data. According to the method, the communication overhead between the upper computer and the wave control and vector network during calibration is saved, the calibration speed and accuracy are improved, and the labor cost is saved.

The utility model belongs to the field of automatic scanning devices, in particular to a multi-angle automatic scanning device for a sorting machine, which is characterized in that the side part of a multi-surface scanning device is fixedly connected with a connecting plate, the end part of the connecting plate is fixedly connected with a sliding frame, a groove at the end part of the sliding frame is slidably connected with a bracket, and the end part of the bracket is fixedly connected to the ground; the middle of the sliding frame is slidably connected to the end of a power piece, the upper portion of the power piece is fixedly connected with a limiting piece, the limiting piece is clamped with a fixing clamping handle, the end of the fixing clamping handle is fixedly connected to the upper portion of the sliding frame, a frame body of the power piece is fixedly connected with a driving piece, and a groove of the sliding frame is slidably connected with a clamping piece. The sliding frame is fixed, so that the height of the multi-surface scanning device can be freely adjusted, sliding of the sliding frame is more stable through connection of the sliding hole and the guide column, the limiting mode is convenient to operate, and height adjustment of the multi-surface scanning device can be completed without an external tool.

This invention relates to the fields of marine meteorology and navigation, and discloses a method for predicting meteorological factors for ship navigation based on marine meteorological information. This method is used to predict meteorological factors for ship navigation, assess navigation risks, and plan alternative routes. The method includes processing meteorological data and ship data for a target sea area to obtain historical meteorological time series and ship motion response sequences; constructing state vector trajectories of meteorological factors using historical meteorological data, establishing a dynamic model library, and obtaining the ship motion response function to meteorology based on meteorological and motion response data; generating deterministic meteorological factor prediction sequences by embedding the current meteorological state into the dynamic model; and constructing stochastic differential equations to generate probabilistic prediction distributions of meteorological factors. This invention integrates data-driven and physical constraints, providing more comprehensive navigation decision support.

The invention discloses a harmonic current measurement method and device based on TCW improved Fourier transform, and the method comprises the steps: reducing a scale factor of a trapezoidal compensation window, carrying out the discrete time Fourier transform of a current sampling signal through the improved trapezoidal compensation window, and obtaining an amplitude measurement value of a DC component; taking the average value of the plurality of amplitude measurement values of the direct-current component as the amplitude of the direct-current component; removing the direct-current component according to the amplitude of the direct-current component and the improved trapezoidal compensation window to obtain a current sampling signal alternating-current component; performing Fourier transform on the alternating current component of the current sampling signal by using the improved trapezoidal compensation window to obtain an alternating current component in the improved trapezoidal compensation window; and when the actual frequency of the harmonic component in the improved trapezoidal compensation window is an integral multiple of the frequency of the harmonic component obtained by Fourier transform, obtaining the amplitude and phase of the harmonic component in the improved trapezoidal compensation window as a harmonic current measurement value. According to the invention, the measurement precision of the amplitude and the phase of the harmonic current is improved.