91 results about "Wave angle" patented technology

Methods and apparatus to visualize locations of radio frequency identification (RFID) tagged items are described. One example method processes received Radio Frequency (RF) waves to extract wave angles to determine a location of one or more RFID tagged items. Additionally, the example method also indicates the location of one or more RFID tagged items via a portable electronic device configured with a transparent visual display.

A drag reduction method for hypersonic vehicles based on the leading edge shock attenuation of synthetic jet wing is proposed. A plasma synthetic jet actuator is installed upstream of the hypersonic vehicle flank. During the flight of hypersonic vehicle, the plasma synthetic jet actuator is turned on to generate discharge in the cavity of the plasma synthetic jet actuator, which causes the gas inthe cavity of the actuator to expand by heat and eject out at high speed to generate high-speed gas hot jet. Under the interaction of high-speed gas hot jet and hypersonic free-coming flow; the jet interaction shock wave, large-scale vortex structure and local relative high temperature region weaken the oblique shock wave intensity, reduce the oblique shock wave angle, raise the shock foot and reduce the pressure on the outer surface of the hypersonic vehicle side wing, thus achieving the purpose of reducing the drag of the hypersonic vehicle. The invention effectively reduces the drag of thehypersonic vehicle without placing higher requirements on the power system or the booster and the aircraft configuration.

The invention discloses a single-hole directional detecting radar antenna for advance geology forecast of a tunnel. The single-hole directional detecting radar antenna mainly comprises a drilled directional radar antenna, an in-hole automatic travelling device and a cable receiving and sending device. The single-hole directional detecting radar antenna further comprises a rotor, a stator and a housing; a directional emission antenna in the rotor continuously rotates to change the emission direction of electromagnetic wave, the reflected wave can be received by a directional receiving antenna in the rotor, and the directional angle of a geological anomalous body can be obtained by the strongest reflection wave angle extracting algorithm; the in-hole automatic travelling device and the cable conveying and recovering machine can be controlled by a radar host to automatically send and recover a radar antenna and a communication cable. With the adoption of the single-hole directional detecting radar antenna, the geological anomalous body within a certain range around a drilled hole can be accurately examined, and the directional angle can be accurately positioned; the detecting directionality can be obviously improved; the resolution of the directional angle of the geological anomalous body can be obviously increased; the detection is fully automatically carried out, and therefore, the detecting efficiency and accuracy can be greatly increased.

The invention discloses an intelligent parking system and a control method thereof. The intelligent parking system comprises an information acquisition unit and a control unit. The information acquisition unit comprises four side radar probes positioned at the front positions and the back positions of the two side edges of a car body and four corner radar probes arranged at the corners of the carbody. The side radar probes and the corner radar probes collect current parking environment information to be transmitted to the control unit, and the control unit combines the information collected by the adjacent side radar probes and the corner radar probes to calculate boundary lines of car body side edges of parked cars, so that edges of parking spaces are fitted, and automatic parking pathsare planned. The corner radar probes are obliquely arranged relative to the car body, the boundary lines of the car body side edges of the parked cars in the inclined parking spaces can be detected through waving angles of the corner radar probes, algorithm fusion is conducted on the information collected by the adjacent side radar probes and the corner radar probes through the control unit, and the boundary lines of the car body side edges of the parked cars are calculated, so that contours of the parking spaces are stimulated, and the parking paths are planned.

The invention belongs to a quick processing method for a sensor antenna array received signals. The quick processing method comprises dividing subarrays, establishing signal matrixes of the subarrays, establishing autocorrelation matrixes and cross correlation matrixes, establishing signal subspace matrixes, establishing signal characteristic matrixes and inverse matrixes thereof, establishing transition matrixes, establishing rotation invariable relation matrixes, and finally obtaining incoming wave angles of different signals. A method of directly establishing the rotation invariable relation matrixes is adopted, and a method of processing and establishing an array rotation invariable relation through the multiplication and addition of the matrixes is only used, so that a sensor antennaarray quickly tests incoming wave directions of a single or a plurality of wireless transmission signals; and compared with the prior art, the method has the advantages that the processing speed is high, the accuracy of testing the incoming wave direction angles is obviously improved particularly when the signal to noise ratio is low, and the method has the characteristics of low requirements forequipment and hardware performance, quick and accurate test on target incoming wave directions, high accuracy, short flow, low operating cost, wide application range and the like.

The invention relates to an asymmetry measurement method for a two-way atmosphere turbulence optical transmission channel. The method is characterized in comprising the steps of firstly, measuring optical wave angle of arrival fluctuation variances in two transmission directions by employing an optical wave angle of arrival fluctuation variance measurement system of the two-way atmosphere turbulence optical transmission channel; secondly, calculating valid coherent lengths of two random phase screens at positions of z=L / 4 and z=L / 3 according to the angle of arrival fluctuation variances in the two transmission directions; and finally, calculating the asymmetry of the two-way atmosphere turbulence optical transmission channel according to the valid coherent lengths of the random phase screen P <l > and the random phase screen P <r >. According to the method, the asymmetry of the two-way atmosphere turbulence optical transmission channel is obtained by measuring the optical wave angle of arrival fluctuation variances of the two-way atmosphere turbulence optical transmission channel, thereby providing actual data support for performance analysis and optimization design of links of a two-way free space optical transmission system in different transmission directions.

A highly-secure wireless communication system has a transmitter for transmitting the same information at predetermined polarized wave angles having different rotation-polarized waves for rotating the polarized waves of a carrier wave, and a receiver for restoring the reception information at the aforementioned predetermined polarization wave angles and for comparing the restoration results of the predetermined polarization wave angles with one another.

The invention relates to a method for evaluating incoming wave direction of multi-sector intelligent antenna system. Wherein, it comprises that (1), using spectrum evaluate method to initially evaluate the incoming wave direction of user, to obtain an incoming wave angle relative to the incoming power spectrum maximum value; (2), based on said angle, judging if user is at the edge of target sector, if it is, calculating out the powers of two sectors near the target sector; (3), if the area pointed by incoming wave angle is near the higher-power nearby sector, said angle is the final result, or else, searching the area reversed to the area pointed by incoming wave angle, to obtain the angle with maximum power spectrum in reversed area, as the final result. The invention can improve the accuracy of DOA evaluation.

The invention discloses a method for extracting a converted wave angle channel set for improving the speed and precision of calculating the converted wave incidence angle in the earthquake process. A channel set, the converted wave speed and aeolotropy parameters of a converted wave are utilized for calculating the speed, the aeolotropy parameters of a longitudinal wave, the longitudinal shot-geophone distance corresponding to the converted wave shot-geophone distance, the converted wave travel time of the aero shot-geophone distance, the longitudinal wave travel time and the interlayer longitudinal wave speed, wherein the channel set is formed through longitudinal wave incidence converted wave data and transverse wave reflection converted wave data, the amplitude of the channel set changes along with the offset distance, and the normal difference of the channel set is corrected. The converted wave incidence angle theta is calculated according to the longitudinal wave time difference equation and the interlayer longitudinal wave speed, and the incidence angle of each sampling point is calculated, wherein each sampling point is placed on the angle channel of the incidence angle. The process is carried out repeatedly for all sampling points to obtain the converted wave angle channel set. According to the method, the calculation is easy to conduct, and the speed and precision of extracting the converted wave angle channel set can be improved.

The invention provides a measuring method of electric parameters with a wide change range and system. The method is applied to a microgrid where medium-small capacity wind generating sets are accessed. The method includes the steps of step 1, obtaining discrete voltage signals through discrete sampling on instantaneous voltage signals, carrying out sliding-window iterative discrete Fourier transform, combined with phase lock negative feedback phase angle signals, on the discrete voltage signals so as to obtain phase difference signals, step 2, carrying out proportional integral control on the phase difference signals to obtain fundamental wave angle frequency of zero phase difference signals, step 3, obtaining output frequency through the fundamental wave angle frequency, carrying out discrete integration on the output frequency and adding the output frequency and the fundamental wave angle frequency to obtain a phase angle, and carrying out phase locking negative feedback on the phase angle, and step 4, computing to obtain voltage and current effective values through the output frequency. The method achieves the purpose of digital phase locking of voltage wide in frequency change range, and provides an input parameter measuring method for quick power control of the medium-small capacity wind generating sets.

The invention discloses a coaxial multi-rotor simulation method and system. The method comprises the following steps: inputting real-time flight parameters and real-time rotor attributes into a coaxial N-rotor finite state model to obtain the induction speed of each rotor and the waving angle and angular acceleration of each blade; calculating the thrust of each rotor wing according to the induction speed in combination with the real-time flight parameters; substituting the thrust into the flight motion equation for resolving to obtain an attitude and a position; performing simulation according to the waving angle and angular acceleration of each blade and the attitude and position; the establishment process of the model comprises the following steps: establishing a single-rotor finite-state model for expressing the relationship among flight parameters, rotor attributes, induction speeds, segmented lift forces of all blades, swing angles of all the blades and angular accelerations; determining a load formula according to the load change of the single rotor wing under the influence of the induced speed of the surrounding rotor wings; and creating a coaxial N-rotor finite state modelaccording to the single-rotor finite state model and a load formula. According to the invention, simulation precision and real-time performance can be considered.

The invention discloses a statistic channel modeling method based on a multi-antenna MIMO 3D hollow ellipsoid. The method comprises the steps of establishing a hollow ellipsoid statistic channel model, calculating the AOA possibility density function of the a azimuth angle and the pitch angle of a 3D hollow ellipsoid moving table end, calculating the AOA probability density function of the azimuth angle and the pitch angle of a base station end, and calculating the probability density function of doppler frequency shift (DS). A multi-antenna MIMO 3D space domain channel model is established, so that the mobile communication environments of macrocells and microcells can be estimated more accurately, flexibly and conveniently, the accuracy of estimation of electromagnetic signal wave angle of arrival (AOA), time of arrival (TOA), Doppler of shift (DS) and other channel parameter estimation can be improved, and the research and the application of space statistic channel models are expanded.

The invention provides an extraction method and an extraction device for extracting the converted wave angle gather of transversely isotropic media. The method comprises the steps of based on a co-conversion point gather of pre-stack converted waves, obtaining a converted-wave stacking velocity Vc2, a vertical velocity ratio gamma 0, an equivalent speed ratio gamma eff and a converted wave anisotropic parameter Chi eff through the velocity analysis progress; at a k-th sampling point, processing each seismic trace in the co-conversion point gather to obtain an incident angle theta k at the k-th layer of the pre-stack converted waves; assigning k to be 1 to n, and conducting the above treatment for each k value so as to obtain a converted-wave incident angle of each seismic trace at each sampling point; classifying seismic traces of the same converted-wave incident angle into the same incident angle gather so as to obtain a converted wave angle gather, wherein n represents the number of total sampling points.

There have been a variety of attempts to make light-emitting display sticks, used when directing traffic at night, cheering at various events, and the like, that not only simply emit light but take advantage of persistence of vision to display letters or patterns in space. However, depending on the manner in which and speed at which the stick is waved, said letters or patterns become distorted and unrecognizable. In light of this problem, the issue is to implement a light-emitting display stick that both is suited to cheering at events and can display easily recognizable letters in space regardless of the manner in which and speed at which the stick is waved. The light-emitting display stick in the present invention contains an internal waving-angle sensor and can display undistorted letters or patterns in space by having light-emitting elements emit light in accordance with waving-angle information indicating angles with respect to a base angle. Said light-emitting display stick can also switch to a mode in which all of the light-emitting elements emit light. Said light-emitting display stick is thus easier to use and more effective.

The invention belongs to the technical field of water immersion ultrasonic non-destructive testing on the inner surface of small-bore tubular equipment in a nuclear power station and relates to an ultrasonic wave angle adjustment device in water immersion ultrasonic testing. The ultrasonic wave angle adjustment device comprises water immersion probes (2 and 4), and the ultrasonic wave angle adjustment device in the water immersion ultrasonic testing is used for adjusting the angles of ultrasonic waves generated by the water immersion probes (2 and 4); the ultrasonic wave angle adjustment device also comprises a mounting base (1), a reflecting mirror (6), a motor (7) and a reflecting mirror base (9), wherein the water immersion probes (2 and 4) and the reflecting mirror base (9) are fixed on the mounting base (1) and are arranged at appointed intervals, the reflecting mirror (6) is rotationally arranged on the reflecting mirror base (9) and faces the water immersion probes (2 and 4), the reflecting mirror (6) is connected with the stator of the motor (7), and the reflecting mirror base (9) is connected with the rotor of the motor (7). According to the ultrasonic wave angle adjustment device in the water immersion ultrasonic testing, the two water immersion probes are adopted, the locating water immersion probe and the quantifying water immersion probe are switched as required by scanning, and the ultrasonic incident angle can be adjusted remotely.

The invention provides a converted wave extreme attribute hydrocarbon detection method, which belongs to the field of hydrocarbon geophysics. The method includes the following steps: (1) a converted wave common conversion point gather is inputted; (2) velocity analysis and dynamic correction are carried out for the common conversion point gather, so that a dynamically corrected gather is formed; (3) longitudinal wave and transverse wave velocity fields are inputted, the angles of converted wave incidence are tracked by a ray, and a converted wave angle gather is formed; (4) the power function y equal to ax plus cx fitting of amplitude versus angle is carried out for a converted wave amplitude sequence at the same time sampling point and different angles of incidence point by point, and an extreme position and extreme amplitude are outputted; (5) a velocity ratio Gamma is obtained by inversion; (6) a transverse wave reflection coefficient Rss0 is inverted; (7) according to a reservoir gas-bearing velocity ratio decrease principle, the gas-bearing property of a reservoir is predicted by means of the velocity ratio Gamma obtained by inversion. The method utilizes high-signal-to-noise-ratio data within an offset range nearby the extreme amplitude, and increases the precision of converted wave AVO (Amplitude Variation with Offset) inversion.

The invention discloses a full-polarized ultra-wideband electromagnetic wave angle selection transparent structure, which is mainly formed by surface close arraying of n cyclic flat plate structures with different cycle numbers. Each cyclic flat plate structure is mainly formed by close alternate lamination of two materials including a flat plate medium and an equivalent electromagnetic medium, wherein two ends of the cyclic flat plate structure are both equivalent electromagnetic media after lamination, and an alternate lamination cycle number is m. The flat plate media and the equivalent electromagnetic media in each cyclic flat plate structure are equal in thickness. By setting of thicknesses of the different cyclic flat plate structures, operating frequency of the cyclic flat plate structures is set; since the cyclic flat plate structures are set to be unequal, different operating frequency distributions are formed on the surface to realize an angle selection transparent surface. An existing research bottleneck is broken through, a traditional design in which only TM polarization angle selection transparency is realized is expanded to TE polarization and arbitrary polarization,and accordingly practical engineering application of the electromagnetic wave angle selection transparent structure is promoted.

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 provides a dimmable LED drive circuit and a control method. The dimmable LED drive circuit comprises a silicon controlled rectifier dimmer, a bleeder current circuit and an LED circuit.The bleeder current circuit provides a current required by the silicon controlled rectifier dimmer when an input voltage does not reach a conduction voltage of the LED circuit. The dimmable LED drivecircuit is characterized in that the dimmable LED drive circuit also comprises a silicon controlled rectifier shear wave angle detection circuit and a bleeder current control circuit. After the silicon controlled rectifier dimmer is conducted, the silicon controlled rectifier shear wave angle detection circuit acquires a first electrical parameter signal representing a silicon controlled rectifiershear wave angle; and the bleeder current control circuit compares the first electrical parameter signal with a first threshold to control the bleeder current circuit. Besides, an output current compensation circuit is further added and used for comparing the electrical parameter signal with a second threshold value to control the current of the LED circuit.

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 method for improving Doppler direction-finding precision and mainly solves a problem of unroundness of Doppler direction finding in the prior art. The implementation scheme includes 1, performing band pass filtering on received signals; 2, performing accumulation pre-treatment on data subjected to filtering; 3, multiplying the accumulated data with local oscillation signals so as to obtain complex baseband signals; 4, performing frequency discrimination computation on the complex baseband signals and replacing a prior local oscillation frequency with a result obtained through computation; 5, performing phase discrimination computation on the complex baseband signals and replacing a prior local oscillation phase with a result obtained through computation;6, performing calculation on the complex baseband signals through a rotating vector method and estimating incoming wave angles. According to the invention, the unroundness is reduced, easy implementation is achieved and the direction finding precision is high; the method is applicable to a single-channel Doppler direction-finding system.

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.