27 results about "Forward wave" patented technology

An electronic device may include signal transmission circuitry having a signal path and a signal source that transmits a signal on the signal path. First and second signal couplers may be coupled to the signal path. Control circuitry may use the first signal coupler to measure the signal at a first reference plane and may use the second signal coupler to concurrently measure the signal at a second reference plane. The signal measurements may include power wave, forward wave, reverse wave, impedance, and / or delivered power measurements. Terminations in the signal couplers may be adjusted to dynamically shift the reference planes. The first and second signal couplers may be formed from first and third metallization layers on a stacked dielectric substrate, where the signal path is formed from a second metallization layer. Additional signal couplers may be coupled to the signal path for concurrently measuring additional reference planes.

A reflective focusing-based depth-velocity modeling method, relating to the field of seismic exploration, comprising: determining an actual seismic record and an initial velocity model (S1); on the basis of a seismic observation system, performing forward simulation on the initial velocity model, and obtaining forward wave field data (S2); on the basis of the actual seismic record and the forward wave field data, calculating a focusing function of a reflected wave residual response, calculating a Green's function of the reflected wave residual response on the basis of the focusing function, and, on the basis of the Green's function and the forward wave field data, calculating a gradient of an objective function with respect to a longitudinal wave velocity (S3); determining an updated velocity model on the basis of the gradient of the objective function with respect to the longitudinal wave velocity and an update step size (S4); and on the basis of the actual seismic record and the updated velocity model, determining whether a termination condition has been met (S5), if so, using the finally obtained updated velocity model as a depth-velocity model, and if not, re-performing forward simulation and the following steps. Further related is a reflective focusing-based depth-velocity modeling apparatus.

A high-frequency power supply system according to the present disclosure includes a first power supply, a second power supply, and a first matcher. The first power supply performs frequency modulation control in a second power supply ON period and performs frequency offset control to output a forward wave voltage VF3 having a fundamental frequency F3 obtained by adding an offset frequency to a fundamental frequency F1 in a second power supply OFF period. An optimum value of an initial phase α of a modulation signal is searched for, and an offset frequency Fos at which a difference between a reflection coefficient ρ11 or load-side impedance Z11 corresponding to a center of a locus and a reflection coefficient ρ12 or load-side impedance Z12 is minimum is searched for, and the fundamental frequency F3 in the second power supply OFF period is set.

The invention relates to the technical field of forward wave oscillators, in particular to a K-band TE11 mode microwave oscillator. Comprising a cylindrical waveguide, and sequentially comprises a cut-off transition section, an interaction section and an output transition section, the cathode structure is mounted in the cut-off transition section; the anode waveguide structure comprises a plurality of slotted circular ring metamaterial units which are arranged in the interaction section at intervals in the axial direction, are linked through a metal cylinder to form a serial structure and are connected to the wall of the cylindrical waveguide to form a double-spiral anode slow wave structure; electron beams generated by the cathode structure rotate in the axial direction under the action of an external electromagnetic field, interact with each other in the anode slow wave structure to excite forward waves in a TE11 mode, and radiate outwards along an output transition section; the collector is arranged in the output transition section. On the basis of realizing a Gaussian beam TE11 mode, a traditional mode conversion structure is omitted, the structure is more compact, and light weight and miniaturization are easy to realize.

The application relates to the technical field of bone imaging, and provides an ultrasonic cancellous bone imaging method based on full-wave inversion, which comprises the following steps: S1: setting an imaged bone phantom model, emitting an ultrasonic pulse signal, recording the ultrasonic pulse signal passing through the model, and sampling the signal as a simulation experiment wave field signal; S2: establishing a simulation wave field, setting an initial sound velocity model as a current sound velocity model; S3: based on the current sound velocity model, carrying out forward modeling on the simulation wave field, carrying out incremental extrapolation of the forward wave field signal along the propagation direction of the ultrasonic pulse signal, recording the simulation wave field signal after completing one round of emission-reception; S4: constructing a loss function, solving the loss function by using a conjugate gradient method, and updating the current sound velocity model; and S5: judging whether the loss function converges or not, and outputting the current sound velocity model if the loss function converges. High-resolution ultrasonic imaging of bone and microstructure is realized, and the demand of bone medical treatment and diagnosis with high precision requirements is met.

The invention provides a PP and PS combined reverse time migration imaging method based on cosine similarity measurement, and the method comprises the steps: 1, obtaining observed seismic data, and extracting seismic wavelets; step 2, calculating a P-wave forward propagation wave field at a seismic source end, a P-wave backward propagation wave field at a detection point end and an S-wave backward propagation wave field at the detection point end; 3, calculating a PP imaging data volume and a PS imaging data volume; 4, calculating the cosine similarity of the PP and PS imaging data volumes; 5, filtering the PP imaging data volume and the PS imaging data volume by using cosine similarity; and step 6, superposing the filtered PP imaging data volume and PS imaging data volume corresponding to all the single shot records, and outputting the PP imaging data volume and the PS imaging data volume. According to the PP and PS combined reverse time migration imaging method based on cosine similarity measurement, the overall quality of PP and PS imaging data volumes is improved, calculation is simple, implementation is easy, high practicability is achieved, and the reliability of the imaging result is high.

The application discloses a kind of plant fiber reinforced composite based on three-dimensional waveguide wave field's full complex stiffness matrix identification method and system, comprising: narrow-band waveguide excitation is applied to sample and three-dimensional velocity time-domain response signal is collected;Signal is converted to polar coordinate system and modal separation is carried out;Real wave number-frequency pair representing dispersion characteristics and imaginary wave number-frequency pair representing attenuation characteristics are extracted respectively;Based on material structure parameter, establish stiffness matrix method forward wave propagation model and calculate theoretical complex wave number;Two-stage optimization objective function of real and imaginary wave number joint constraint is constructed, and full complex stiffness matrix is obtained by mixed optimization algorithm inversion.This application realizes the decoupling of geometric diffusion and material dissipation by multi-modal three-dimensional wave signal processing and complex wave number separation extraction;Combined with efficient forward model and global-local mixed optimization strategy, the stability and precision of high-dimensional parameter inversion are improved, which can be used for nondestructive testing and viscoelastic parameter accurate identification of plant fiber reinforced composite.

The invention provides a radio frequency power supply phase synchronization method, a phase calibration method and a calibration device thereof. In one embodiment, the radio frequency power supply phase synchronization calibration method comprises the steps of obtaining a phase of a co-excitation input signal, obtaining a phase of a sampling signal, calculating a first phase difference between the sampling signal and the co-excitation input signal, obtaining a phase of a forward wave signal in a load signal, and calculating a second phase difference between the sampling signal and the co-excitation input signal. A second phase difference between the forward wave signal and the co-excitation input signal is calculated, a third phase difference between the forward wave signal and the load signal is calculated, and the third phase difference is calculated based on the load signal and the forward wave signal and the reflected wave signal in the load signal; and calculating a fixed phase difference based on the first phase difference, the second phase difference and the third phase difference, wherein the fixed phase difference serves as a phase synchronization calibration parameter of the radio frequency power supply. The phase synchronization calibration method can realize phase synchronization of the radio frequency power supply output signal and the co-excitation input signal under any load impedance.

The present application relates to a kind of back wave field synthesis processing method, device, computer equipment and storage medium, method includes the following steps: respectively obtaining source back wave data and source wavelet data;According to source back wave data and source wavelet data, determine sparse linear filter coefficient;Using the numerical value of non-zero sparse linear filter coefficient and delay, time delay weighted superposition of forward wave field, synthesis back wave field.The above-mentioned back wave field synthesis processing method, based on source back data is the convolution of source wavelet data and sparse linear filter, determine sparse linear filter coefficient by source back data and source wavelet data, then according to the principle of superposition, time delay weighted superposition of forward wave field, synthesis back wave field.No need to rely on back data to obtain back wave field by solving wave equation, power is greatly reduced, can improve processing efficiency, reduce processing time, can also reduce memory consumption, so as to reduce power cost.

The invention relates to a fault property pre-judgment method and equipment for a multi-terminal flexible direct current selective coincidence line. The method comprises the following steps: judging whether the line has a fault or not; judging an area where a fault occurs; selecting one end from the transmitting end and the receiving end as an injection end according to the fault occurrence area, and controlling the injection end to inject a mixed voltage wave sequence; calculating an injection end line mode voltage fault forward wave; building an equivalent calculation circuit model for lossless traveling wave calculation, and theoretically calculating a fault-free forward traveling wave of the line mode voltage of the injection end; and reconstructing the injection end line mode voltage fault forward wave and the fault-free forward wave, and calculating the Hausdorff distance between the reconstructed injection end line mode voltage fault forward wave and the fault-free forward wave so as to judge the line fault property. According to the method, the overcurrent risk of the direct current circuit breaker or the MMC converter is completely eliminated, the safety of primary equipment is greatly improved, and the method has the advantages of high transition resistance resistance and dead zone fault identification capability.

The invention discloses a power transmission line three-point fault distance measurement method and system, and the method comprises the steps: obtaining the initial fault traveling wave arrival time of all measurement points of a power transmission line when the power transmission line triggers fault distance measurement, and calculating the front traveling wave waveform and the reverse traveling wave waveform of a third measurement point; and judging the direction of an initial fault traveling wave of the third measurement point based on the forward traveling wave waveform and the reverse traveling wave waveform, selecting a distance measurement formula corresponding to the direction, and calculating the distance between the first measurement point and the fault point and the distance between the second measurement point and the fault point by using the distance measurement formula according to the arrival time of the initial fault traveling wave. The approximate position interval of a fault point can be indirectly judged in a mode of calculating a forward wave waveform and a reverse wave waveform, so that a distance measurement formula needing to be used is determined, accurate fault distance measurement can be realized by using the distance measurement formula according to the arrival time of an initial fault traveling wave, and the process does not need to depend on the wave velocity; therefore, the fault distance measurement precision is improved.

The invention discloses a heart-shaped channel positive and negative wave coupling sound production and pickup device. A sound box relates to the technical field of acoustics, and is characterized in that a plurality of sound outlet holes are formed in the front surface of a box body shell along the edge of the box body shell; the loudspeaker unit is embedded in the box body shell and faces the front face of the box body shell, and the other face of the loudspeaker unit is located in the box body shell; the heart-shaped main cavity and the crescent-shaped auxiliary cavity are arranged in the box body shell, the heart-shaped main cavity is arranged on the peripheral side of the loudspeaker unit in a surrounding mode, and the crescent-shaped auxiliary cavity is located below the heart-shaped main cavity. According to the heart-shaped channel positive and negative wave coupling sound production and pickup device, a heart-shaped main cavity is firstly filled with backward waves generated by vibration of a vibrating diaphragm of a loudspeaker unit, and the backward waves enter a crescent-shaped auxiliary cavity through an opening in the apex part of the heart-shaped main cavity according to the physical function characteristics of the heart shape; and the air enters the air through a plurality of small holes distributed in the edge part of the crescent-shaped auxiliary cavity and is coupled with the forward wave of the loudspeaker unit.

The present application belongs to the field of tunnel engineering geophysical prospecting technology, and particularly relates to a full-wave field tunnel advanced exploration method based on rock physics constraints, which comprises the following steps: constructing an initial geological model, sampling at the upper interface of the tunnel layer and carrying out longitudinal and transverse wave velocity measurement to obtain longitudinal wave velocity Vp and transverse wave velocity Vs, combining all the sampled longitudinal wave velocity Vp and transverse wave velocity Vs according to the VRH theory to calculate the longitudinal and transverse wave velocities of the target layer, obtaining the elastic parameters of the target layer, importing the obtained elastic parameters into the initial geological model to obtain a parameter inversion initial model, constructing a forward wave field and simulated seismic record, making a difference between the actual observation record and the simulated record, and carrying out conjugate gradient inversion. The present application can provide more accurate tunnel front geological prediction by fully utilizing all the wave field information excited by the shield machine and carrying out high-precision parameter inversion under the rock physics constraints, thereby providing a scientific basis for safe and efficient construction of the shield machine.

To perform protection control regardless of an output set value of progressive wave power of a repetition period.SOLUTION: The high-frequency power supply device 101 outputs progressive wave power PF having a plurality of levels of power values during a repetition period T to a load, and includes an instantaneous power upper limit setting unit 50 that sets a first instantaneous power upper limit value Pmax, a first output setting unit 60 that sequentially outputs an output power set value Pfset corresponding to an elapsed time, a coefficient setting unit 61 that sets an output power coefficient k within a range in which an average power value during the repetition period does not exceed an average power upper limit value, a multiplication unit 70 that outputs a second instantaneous power upper limit value k·Pmax obtained by multiplying the first instantaneous power upper limit value Pmax by the output power coefficient k, a second output setting unit 80 that outputs a second output set value PFset2 that is a smaller one of the first instantaneous power upper limit value Pmax and the second instantaneous power upper limit value k·Pmax, and an output power control unit 90 that performs control so that a progressive wave power value pf becomes equal to the second output set value PFset2.SELECTED DRAWING: Figure 2

The invention discloses an earth and rockfill dam hidden danger full-waveform inversion method based on a simulated inter-well observation system, and the method comprises the steps: laying excitation points and detection points at a dam crest and upstream and downstream dam slopes along the cross section of an earth and rockfill dam, and constructing the simulated inter-well observation system to collect seismic data; establishing a hidden-danger-free initial model, performing forward modeling as a current model, and constructing a target function based on observation and simulation records; when the target function value does not reach the preset threshold value, performing wave field back-stepping through the residual record, and calculating the physical property parameter gradient of the current model in combination with the forward modeling wave field; processing by adopting a conjugate gradient method to obtain a conjugate gradient, and then constructing a precondition operator for suppressing surface wave interference and accelerating deep updating in a dam body to correct the precondition operator; and obtaining an optimal inversion step length through step length search, updating the model, and carrying out iteration until an objective function is converged, so as to obtain a physical property parameter model reflecting the earth and rockfill dam hidden danger. According to the invention, the accuracy and inversion efficiency of earth and rockfill dam hidden danger detection can be effectively improved.

The present invention provides a radio wave radiation device capable of increasing the possibility that a radiation target reaches a target state and improving the energy efficiency of radio waves. A radio wave radiation device (1) comprises: a signal generation unit (2) that generates a high-frequency signal; a power amplification unit (41) that amplifies the high-frequency signal; a radio wave radiation unit (51) that enables radiation of radio waves into a chamber accommodating a radiation target on the basis of the high-frequency signal amplified by the power amplification unit (41); a traveling wave power measurement unit (151) that measures the power of a traveling wave; a reflected wave power measurement unit (161) that measures the power of a reflected wave; and a control unit (71) that executes first control for controlling the power amplification unit (41) so that the power of the traveling wave is equal to or greater than a first power value for causing the radiation target to change to a target state, and switches from the first control to second control for controlling the power amplification unit (41) so that the power of the traveling wave becomes equal to or greater than a second power value that is greater than the first power value when it is determined, on the basis of the power of the reflected wave, that the radiation target has changed to the target state.

This application relates to a method, system, terminal, and storage medium for suppressing coupled vibrations in ships, and pertains to the technical field of ship vibration reduction control. The method includes acquiring the shafting torsional vibration amplitude; determining whether the shafting torsional vibration amplitude exceeds a preset torsional vibration amplitude threshold; if not, continuously acquiring the shafting torsional vibration amplitude for cyclic judgment; if exceeding, acquiring the main engine output torque and shafting output torque; determining whether the main engine output torque and shafting output torque meet preset coupled vibration result requirements; if not, continuously acquiring the main engine output torque and shafting output torque for cyclic judgment; if meeting, acquiring historical intervention data and forward wave data; analyzing the historical intervention data and forward wave data, and controlling a preset dynamic torque output from the motor to suppress the coupled vibration between the preset ship main engine and the preset shaft drive system. This application improves the effectiveness and accuracy of ship coupling suppression.

The application provides a processing method for western system airborne friend-or-foe identification, comprising the following steps: developing laboratory test on OBA table of each sub-wave position in N main-wave position and M sub-wave position set and obtaining; carrying out autonomous scanning or traction inquiry according to working mode instruction, putting forward wave beam dispatch optimization according to demand, carrying out plot condensation according to response data obtained by inquiry, and obtaining initial plot; carrying out same sector preprocessing and different sector preprocessing on the initial plot; designing adaptive correlation threshold, taking each mode clear code as target friend-or-foe identification task processing criterion, carrying out correlation matching according to the adaptive correlation threshold, simultaneously introducing multi-target cluster similar identification, and obtaining target friend-or-foe identification attribute; maintaining and reporting once radar traction target set. The application can effectively improve the azimuth detection precision of the target, better avoid mis-correlation phenomenon when the number of targets in the same area is relatively large, and greatly improve the friend-or-foe identification success rate.

The application discloses a high-precision cross-hole geological radar detection method, comprising the following steps: acquiring radar single-hole self-sending and self-receiving data of a single excitation source of two detection holes respectively, and acquiring radar double-hole transmission data of the two detection holes; generating an initial geological model by using the radar single-hole self-sending and self-receiving data; converting the radar double-hole transmission data into radar single-hole reflection wave data by virtual source mapping; carrying out forward modeling on the radar double-hole transmission data based on the initial geological model to obtain a forward wave field; carrying out wave field reverse continuation on the radar single-hole reflection wave data based on the initial geological model to obtain a reverse-time wave field; imaging the forward wave field and the reverse-time wave field at the same time to obtain imaging results, and then superimposing the imaging results of the excitation sources at different depths of the same detection hole to obtain wave field migration imaging. Compared with the prior art, the method improves the imaging precision.

Method for analyzing a measurement object, where n is a number greater than or equal to 1, comprising the following steps: - Generating a generator signal, - Direct forwarding of the generator signal to an input switch (2), - Forwarding the generator signal as a leading wave to a coupling unit (3.1, 3.2, 3.3, 3.4) selected by means of the input switch (2), - Tapping a reference signal (a x = i,j,k,l ) from the leading wave in the coupling unit (3.1, 3.2, 3.3, 3.4), - Forwarding the leading wave to a measuring object, - Return of a wave reflected from the object under test to the selected coupling unit (3.1, 3.2, 3.3, 3.4) and extraction of a corresponding return signal (b x = i,j,k,l ) from the returning wave through the selected coupling unit (3.1, 3.2, 3.3, 3.4) and / or - Transmission of a wave transmitted through the object under test to another coupling unit (3.1, 3.2, 3.3, 3.4) and extraction of a corresponding transmission signal (b x = i,j,k,l ) from the transmitted wave through the other coupling unit (3.1, 3.2, 3.3, 3.4), - Feeding in the tapped signals (a x = i,j,k,l , b x = i,j,k,l ) to a single measuring point (5) via a coupling switch (4), - Separating and demodulating the tapped signals (a x = i,j,k,l , b x = i,i,k,l ) at the measuring point (5) and - Calculation of the behavior of the object being measured at the measuring point (5).

The invention discloses a wave field direction calculation method and device based on a stabilized Poynting vector, electronic equipment and a storage medium. The method comprises the following steps: calculating a wave equation forward propagation wave field through a finite difference algorithm based on a migration velocity field and seismic wavelets; calculating a first gradient operator and a first time derivative of a forward propagation wave field of the wave equation; calculating a first Poynting vector of the forward propagation wave field based on the first gradient operator and the first time derivative; calculating a second gradient operator corresponding to the first time derivative and a second time derivative; calculating a second Poynting vector of the time derivative wave field based on the second gradient operator and the second time derivative; and constructing a stabilized Poynting vector of the forward propagation wave field based on the first Poynting vector and the second Poynting vector. According to the method, the calculation instability of the Poynting vector at the local extreme value is effectively eliminated, the efficient calculation of the real propagation direction of the seismic wave field is realized, and the extraction precision of the angle gather is improved.

The application provides a multiple wave migration imaging method and device based on an iterative deconvolution imaging condition, relates to the fields of seismic data imaging and migration in oil geophysical exploration, and comprises the following steps: obtaining a seismic wave forward wave field and a seismic wave reverse wave field; performing multiple wave imaging on the seismic wave forward wave field and the seismic wave reverse wave field by using a deconvolution imaging condition to obtain an initial imaging result; taking the seismic wave forward wave field, the seismic wave reverse wave field and the initial imaging result as inputs, and performing multiple wave imaging by using an iterative deconvolution imaging method to obtain an iterative deconvolution multiple wave imaging result; determining a deconvolution imaging target function value in the multiple wave imaging process; if the target function value does not satisfy a preset condition, performing iteration on the imaging result until the deconvolution imaging target function value satisfies the preset condition; and generating a final iterative deconvolution multiple wave imaging result according to the iterated imaging result.

This invention relates to the field of ship adjustment technology and discloses a navigation planning and control method for an autonomous sightseeing boat based on ADRC. The method includes: acquiring the sightseeing boat's pose feedback and forward wave disturbance data; mapping the disturbance data to feature sampling points and fitting them to generate a spatiotemporal evolution envelope of the disturbance; determining a gradient gain factor based on the principal curvature of the evolution envelope at the forecast point; using the gradient gain factor to set the observation bandwidth of the extended state observer and estimating the lumped disturbance amount including environmental interference and unmodeled dynamics; generating an initial adjustment amount based on the path deviation and outputting a thrust command in conjunction with the lumped disturbance amount. This invention utilizes differential geometric features to actively adjust the observation bandwidth, transforming disturbance perception from a delayed response to an early prediction, effectively suppressing the divergence of observation logic caused by the physical limitations of the power system, and ensuring the fidelity of path tracking in complex waters.

This invention discloses a method for measuring the reflection coefficient of an internal electromagnetic field. Based on field values ​​measured at three equally spaced points, this method extracts the field values ​​of the forward and backward waves from the total electromagnetic wave, including both forward and backward waves, using the field values ​​of these three points within a one-dimensional uniform or periodic structure. The reflection coefficient within the structure is then obtained accordingly. This method is simple, fast, and accurate, and can be used in the design of transmission lines and antennas. It can be applied to both uniform and periodic structures; both closed transmission line structures such as waveguides and open transmission lines such as microstrip lines; both waveguide structures of transmission lines and radiating structures of antennas; and both lossless and lossy structures.

The application discloses a protection method for flexible direct current (HVDC) lines based on fault transient amplitude-frequency extreme value and energy distribution, and specifically comprises the following steps: Step 1, extracting voltage and current data in a time window from before protection starting to after protection starting, and obtaining a line mode voltage forward wave; Step 2, calculating a fault transient amplitude-frequency curve of the forward wave according to the line mode voltage forward wave obtained in Step 1; Step 3, performing normalization processing on the extracted fault transient amplitude-frequency curve; Step 4, identifying characteristic parameters of the normalized fault transient amplitude-frequency curve, counting the number of maximum values N max , if N max > 2, it is judged as an internal fault; otherwise, Step 5 is entered; Step 5, defining a low-frequency band energy proportion of the normalized fault transient amplitude-frequency curve as R , and judging the fault type. The method can accurately distinguish internal faults, external faults and lightning interference in the initial stage of protection starting.

[Task] A radio transmitter test system enables an exact measurement of the reflected wave power of an antenna. [Solution] A radio transmitter test system (100) includes: a power amplifier (136) that amplifies the power of a high-frequency signal from a signal generator (134); a simulation antenna (130) for which a voltage standing wave ratio is variable and which is connected to a coaxial cable (112) instead of an antenna (102); a directional coupler (138) connected between the power amplifier and the simulation antenna, which couples the high-frequency signal to the simulation antenna and outputs forward wave power and reflected wave power between the power amplifier and the simulation antenna; a power meter (140) connected downstream of the directional coupler;and a control device (110), wherein the control device calculates, for each voltage standing wave ratio of the simulation antenna, a correlation coefficient which specifies a correlation between the forward wave power and the reflected wave power of the simulation antenna, and the forward wave power and the reflected wave power measured by the power meter, and the reflected wave power of the antenna by correcting the forward wave power and the reflected wave power measured by the power meter with the correlation coefficient in a state in which the simulation antenna is replaced by the antenna.

An electronic device may include signal transmission circuitry having a signal path and a signal source that transmits a signal on the signal path. First and second signal couplers may be coupled to the signal path. Control circuitry may use the first signal coupler to measure the signal at a first reference plane and may use the second signal coupler to concurrently measure the signal at a second reference plane. The signal measurements may include power wave, forward wave, reverse wave, impedance, and / or delivered power measurements. Terminations in the signal couplers may be adjusted to dynamically shift the reference planes. The first and second signal couplers may be formed from first and third metallization layers on a stacked dielectric substrate, where the signal path is formed from a second metallization layer. Additional signal couplers may be coupled to the signal path for concurrently measuring additional reference planes.