90 results about "Wave angle" patented technology

The invention discloses a low-complexity polarization parameter estimation and tracking device and method. The device comprises an antenna signal processing module and a polarization parameter estimation module; the antenna signal processing module comprises multiple subarray signal processing modules, analog signal beams received by a mixed dual-polarized antenna array is formed and converted into a digital signal; and the polarization parameter estimation module is used for performing signal processing on the output of the antenna signal processing module to estimate an incoming wave polarization parameter. The signal is received by adopting a plane mixed dual-polarized antenna array, the self-adaptive tracking and estimation of the incoming wave angle of arrival can be sufficiently utilized to improve the beam forming receiving signal-to-noise ratio, thereby improving the estimation precision and convergence speed of the parameter estimation, and the calculation process only relatesto ordinary four arithmetic operation, the calculated quantity is small, and the realize is fast.

The invention discloses a method used for estimating an incoming wave angle by directional diagram overlapped antennas and used for indoor positioning. The method comprises the steps that the multipledirectional antennas are used for common point installation to realize overlapping of directional diagrams of the directional antennas. Difference operation is carried out on received incoming wave signal strength (Rss) through the multiple directional antennas, and AoA is estimated by using an Rss difference value. The method has the characteristics of low complexity and high AoA estimation accuracy, and conditions are created for improving the indoor moving target position estimated accuracy based on the WLAN network and the Rss.

The embodiment of the invention provides a wave-absorbing device which comprises a wave-absorbing module and an electromagnetic wave angle adjustment module, wherein the electromagnetic wave angle adjustment module is used for converting an electromagnetic wave emitted from a spherical electromagnetic wave, which is sent out by a point source, into a parallel electromagnetic wave; and the parallel electromagnetic wave is emitted to the wave-absorbing module and absorbed by the module. By using the wave-absorbing device, the electromagnetic wave sent out by the point source can be converted into a plane wave after passing through the electromagnetic wave angle adjustment module, and then the plane wave is vertically emitted to the wave-absorbing module, thereby forming an outstanding wave-absorbing effect to the electromagnetic wave sent out by the point source.

The invention discloses a longitudinal wave and converted wave prestack joint inversion method and system. The method comprises the steps that a longitudinal wave angle gather and a converted wave angle gather are input; longitudinal wavelets and converted wavelets at all angles are extracted; an initial elasticity parameter model of a longitudinal wave time domain is established; a longitudinal wave synthesis record error of the longitudinal wave time domain is calculated; a time-displacement operator matrix and an error back-propagation operator matrix are calculated; a converted wave synthesis record error of a converted wave time domain is calculated; a total error of longitudinal waves and converted waves in the longitudinal wave time domain is calculated; if the total error is smaller than or equal to a set error threshold value, an elasticity parameter inversion result is output; and if the total error is greater than the set error threshold value, a logarithmic elasticity parameter model of the longitudinal wave time domain is updated. Through the method and system, longitudinal wave and converted wave prestack joint inversion in which longitudinal waves and transverse waves are precisely and automatically matched is realized, the precise and stable elasticity parameter inversion result is acquired, and reservoir prediction precision is improved.

An ultrasonic inspection method of a back end of a thick-wall aluminum alloy pipe relates to a method for inspecting the back end of the thick-wall aluminum alloy pipe and solves a problem that the inspection is not complete when a presently-adopted metallographical random inspection method is used for inspecting back end residual of a thick-wall aluminum alloy pipe workpiece. The ultrasonic inspection method is as follows: selecting an ultrasonic detector and a longitudinal wave normal probe and a transversal wave angle probe which are assorted with the ultrasonic detector; grinding an interface between the transversal wave angle probe and a workpiece into a cambered surface with curvature which is the same as the curvature of the pipe workpiece; debugging the ultrasonic detector and the probes in a combined manner; then, by using the two probes, simultaneously carrying out ultrasonic inspection on a tail end of the thick-wall aluminum alloy pipe workpiece to be inspected; moving the probes towards the pipe tail part by starting from a position in which echo wave amplitude of the ultrasonic probes is 80 percent of a full swing, till the amplitude is not greater than 1 percent; and cutting a 20-millimeter section of the pipe workpiece in a direction, which is the reverse of the movement direction of the ultrasonic probes, by taking the position as a boundary. The invention can realize 100-percent inspection of products, avoids phenomena of missed inspection of the back end residual and waste of surplus cut finished products, and ensures the product quality.

The invention discloses a positioning method based on arrival time and angle of arrival. The method comprises the steps that S1 a receiver receives a signal sent by a transmitter, detects the power ofthe signal, and acquires the incoming wave angle of the transmitter according to the power; S2 the receiver detects the transmission delay of the transmitter transmitting an ultra-wideband signal, and calculates the distance between the receiver and the transmitter according to the transmission delay; and S3 according to the incoming wave angle in the step S1 and the distance in the step S2, thelocation of the transmitter is determined. The positioning method is simple.

The invention relates to seismic data processing, in particular to a method of directly extracting longitudinal wave time domain converted wave angle gather. Multi-wave and multi-component seismic disposal forms rectified gather of normal time difference with amplitude varying with offset. The rectified speed, the vertical speed ratio and the effective speed ratio of a transverse wave reflective converted wave time difference are obtained through speed analysis. The thickness of each layer, inter-layer longitudinal waves and transverse wave speed parameters of layered media are calculated by using a Dix formula. Ray tracing calculates longitudinal wave incidence, a transverse wave reflective converted wave incidence angle and corresponding longitudinal wave reflective time of each sampling point. The sampling points are placed on the longitudinal wave reflective time of the angle gather of a converted wave incidence angle to obtain the longitudinal wave incidence of longitudinal wave time domain and the angle gather of the transverse wave reflective converted wave. The method of directly extracting the longitudinal wave time domain converted wave angle gather simplifies multi-component information united explanation flow, and obtained converted wave angle gather can be directly used for AVO inversion of converted waves and can also be directly used for AVO inversion of multiple waves.

The invention discloses a power factor correction (PFC) circuit, a load driving circuit and a signal control method. An input end of the PFC circuit receives chopped wave voltage. The PFC circuit comprises a main switch tube and a Ton control unit. Control signals of the Ton control unit is in positive correlation with chopped wave angles of the chopped wave voltage within a range smaller than or equal to a maximum. The PFC circuit further comprises a detection compensation unit, and the detection compensation unit is used for detecting the chopped wave angles of the chopped wave voltage, generating compensating signals with amplitude in positive correlation with the chopped wave angles and controlling comparison signals of the Ton control unit according to the compensating signals so as to enable control signals corresponding to the equal chopped wave angles within a range of the control signals smaller than or equal to the maximum. The PFC circuit, the load driving circuit and the signal control method can shorten invalid adjusting process in a light-dimming process.

The invention discloses a simple AOA signal incoming wave angle calculation system and a method thereof, the simple AOA signal incoming wave angle calculation system comprises a baseband signal processing module and an AOA signal processing module; the baseband signal processing module is connected with the AOA signal processing module; the baseband signal processing module is used for calculating a frequency deviation value of an AOA signal and a multipath channel impulse response numerical value and sending the frequency deviation value and the multipath channel impulse response numerical value to the AOA signal processing module; the AOA signal processing module is used for receiving the frequency deviation value and the multipath channel impulse response value, realizing frequency deviation compensation and multipath compensation of the AOA signals, calculating the phase and frequency f of each compensated AOA signal, and subtracting the phases of the previous antenna and the current antenna at the same moment to obtain a phase difference psi; and the current incoming wave angle theta is calculated according to the phase difference and the frequency. On the premise that the algorithm precision is ensured, the calculation process of the signal angle is greatly simplified, and implementation of the algorithm in the SOC is facilitated.

The invention relates to a multi-component seismic data amplitude-preserving angle domain common imaging point gather extraction method and system. The method comprises the following steps of constructing a forward-propagation multi-component seismic wave field; calculating a gradient profile according to the forward-propagation multi-component seismic wave field; constructing a descending direction profile based on the gradient profile; utilizing the descending direction profile to obtain a predicted seismic wave field; calculating a predicted multi-component seismic record increment based onthe predicted seismic wave field; updating the offset domain common imaging point gather and predicting the multi-component seismic record according to the optimal step length, the descending direction profile and the multi-component seismic record increment; judging whether convergence standards are met or not; if so, outputting a final offset domain common imaging point gather and determining an optimal angle domain common imaging point gather; and if not, calculating the offset domain common imaging point gather gradient profile of the next iteration until the optimal angle domain common imaging point gather is obtained. According to the method, the multi-wave angle domain common imaging point gather with high precision, high resolution, high signal-to-noise ratio and amplitude fidelity can be obtained.