10 results about "Wave train" patented technology

This application relates to the field of medical ultrasound measurement technology, specifically providing a method for in-situ measurement of skull thickness and sound velocity using ultrasound. The method includes: acquiring reflected echo data from N transmitting array elements, wherein the N transmitting array elements sequentially transmit ultrasound waves to the location to be measured on the skull, and array elements centrally symmetrical to the transmitting array elements receive the reflected echoes of the ultrasound waves; arranging the reflected echo data from the N transmitting array elements together to form a wave train diagram of the N transmitting array elements; extracting the sound pressure amplitude values ​​corresponding to the normal incident reflection time from the wave train diagram, and superimposing the extracted sound pressure amplitude values ​​to form a superimposed amplitude spectrum, with the maximum superimposed sound pressure amplitude value corresponding to the wave train diagram being the equivalent matching velocity; and calculating the sound velocity and thickness at the location to be measured on the skull based on the equivalent matching velocities at the maximum superimposed sound pressure amplitude values ​​and the normal incident reflection time. This method can accurately measure the sound velocity and thickness of the skull in situ.

TITLE: Device and method for very precise pointing of a decoy source. Device for very precise pointing of a decoy source comprising one or more galaxies of geolocation satellites regularly emitting, for each satellite, a wave train, three GNSS antennas arranged more than one meter apart, said antennas forming a planar triangle, the three heights of said triangle each having a length greater than one meter, said three antennas being positioned on the aircraft in such a way that they receive the signals emitted by the geolocation satellites, a means of comparing, for each selected satellite and at each instant, the time difference values ​​allowing to determine, if these time difference values ​​are respectively substantially equal to a predetermined value, greater than a few tens of nanoseconds,and in this case to determine that the signals sent by this satellite are not spoofed, and that otherwise the signals sent by this satellite are spoofed, a calculation method allowing precise targeting of the spoofing satellite, in the case where the method has determined that the selected satellite is spoofed, by constructing a trihedron with the antennas as its base and a point as its vertex indicating the direction of the spoofing satellite. Figure for the abbreviation: Figure 1,

This invention discloses a wave generation control method and apparatus for wave generators deployed at both ends in a wave testing tank. First, the target positions and target angular frequencies of two wave trains are determined based on the target function, which can be wave attenuation, bidirectional wave generation, or focused wave generation. Then, the propagation times of the two wave trains are calculated respectively. Based on the propagation times, the target activation time of the corresponding wave generator is determined. Finally, the corresponding wave generator is activated at the target activation time, generating the corresponding waves based on the target wave height and target angular frequency. In this invention, each end of the wave generators deployed at both ends can independently control wave generation at each end. Based on the synergistic effect of the wave generators deployed at both ends, wave propagation and superposition are controlled, accurately generating focused waves and simulating the effect of concentrated waves on marine structures.

The application belongs to the field of wireless communication, and relates to a 5G millimeter wave train-ground wireless communication switching method, device and computer equipment. The method comprises the following steps: predicting a future trajectory of a train and a signal change trend based on multi-source information fusion, forming a prediction baseline, and generating initial switching strategy parameters; periodically acquiring a real physical state at a current time before a switching correction time limit, comparing the real physical state with the prediction baseline in real time, and calculating a deviation amount; diagnosing whether the current real-time situation and the predicted wireless propagation law are consistent, thereby evaluating the credibility of the initial prediction, and obtaining a diagnosis result; according to the diagnosis result, corresponding decision branches are executed, and final switching control parameters are generated online; link switching of a physical layer and a protocol layer is completed, and real-time confirmation is performed; switching process data is collected, switching performance is evaluated, and iterative updating of channel characteristic parameters is driven. Precise prediction and intelligent decision can be performed, efficient link switching can be performed, and continuous optimization and performance improvement can be realized.

The application discloses a turbine rotating-static spacing design method for inhibiting wave system interference, and the method comprises the following steps: obtaining turbine overall design input parameters; establishing a rotating-static axial spacing quantitative calculation model based on the input parameters; satisfying supersonic airflow local blockage conditions; and inhibiting wave system interference through induced shock waves. The optimal spacing is calculated by using the model, so that the rotor blade is swept by three times of extended, reflected and induced shock waves when passing through the guide vane channel, and aerodynamic excitation spectrum is widely distributed. The spacing is output to the turbine stage axial layout design. The application optimizes the axial distance between the rotor blade and the stator guide vane, directly reduces the turbine stage axial size, and through the accurate control of the axial spacing, the rotor blade is swept by three times of extended, reflected and induced shock waves when passing through the guide vane channel, the wide distribution of the aerodynamic excitation energy spectrum is realized, and the aerodynamic excitation on the turbine rotor blade is significantly reduced.

The application provides a method and system for calculating the electromagnetic scattering coefficient of a sea surface under the action of a two-dimensional flow field, comprising the following steps: step 1, setting a sea surface area to be observed, setting flow field and wind field data, and setting radar parameters; step 2, setting relevant parameters in a wave-current interaction model, and establishing a wave action spectrum conservation equation according to the wave-current interaction model; step 3, solving the wave action spectrum conservation equation by using a ray tracing method to obtain a new wave action spectrum of a wave train after the wave train is modulated by the flow field; step 4, converting the new wave action spectrum obtained in step 3 into a wave height spectrum, and calculating sea level related information including the root mean square height and the local incidence angle of each point by using the wave height spectrum; and step 5, inputting the calculated sea surface information and the set radar parameters into an IEM electromagnetic scattering model to calculate the modulated backscattering coefficient. The flow field modulation model based on the IEM model can effectively calculate the electromagnetic scattering of the sea surface under the modulation of the two-dimensional flow field.

This invention discloses a method, apparatus, and electronic device for inverting landslide surge wave height based on distributed optical fiber sensing. The method includes: acquiring the raw time-series signal collected by an optical fiber sensing array and performing adaptive denoising processing; separating high-frequency landslide vibration and low-frequency surge components using time-frequency analysis technology to construct a spatiotemporal evolution spectrum; accurately determining landslide surge events based on the distinct trajectory slope characteristics exhibited in the spectrum due to the significant difference in propagation speed between the two components; constructing a frequency-domain phase-pressure conversion model, introducing a frequency-dependent correction factor to restore the true surge pressure spectrum, and determining landslide deformation correction coefficients based on wave train superposition characteristics to compensate for energy dissipation; and finally, combining the above factors and coefficients to invert and obtain the corrected landslide surge wave height. This invention effectively solves the problems of difficult signal identification and insufficient inversion accuracy in complex water areas through physical field decoupling and a dual correction mechanism, achieving high-precision quantitative monitoring of the entire landslide surge process.

This application provides a waveform processing method and electronic device for numerical simulation of acoustic variable density logging, belonging to the field of numerical simulation technology. The method includes: obtaining an engineering value of the acoustic amplitude based on the calculated acoustic amplitude waveform; calculating the cement bonding index based on the engineering value of the acoustic amplitude; simulating the cement bonding index waveform based on the cement bonding index; and when the positive peak amplitude is greater than a preset threshold, using a numerical simulation waveform processing algorithm to extract the positive peak from the wave train of the cement bonding index waveform, performing variable density map processing, and obtaining a forward-modeled acoustic amplitude variable density map. This application's solution can quantitatively determine the degree of cement bonding based on the cement bonding index and intuitively evaluate the cementing quality based on the forward-modeled acoustic amplitude variable density map.

The application relates to a pile single-hole seismic wave imaging detection method and device, and relates to the field of engineering measurement, which comprises the following steps: S1, after a detection sensor is lowered, a coupling fluid is filled in an acoustic pipe; S2, vertical excitation is applied on a pile top, so that a seismic wave signal is excited in pile concrete; S3, a detection sensor receives a Stoneley wave signal generated by the coupling effect of the seismic wave on the interface of a pile defect and the fluid in the acoustic pipe; S4, a depth-time wave train is generated according to the Stoneley wave signal; and S5, an eight-character feature in the wave train is identified to judge and position the pile defect. The application has the effect of improving detection efficiency.