109 results about "Modulation function" patented technology

The invention discloses a power grid power load intelligent prediction method, system and device and a medium, and relates to the technical field of power distribution network transmission optimization. Power load data is decomposed into a trend component, a periodic component and a random fluctuation component, and then the importance of different components is evaluated by using a feature channel attention layer; the time sequence attention layer captures key moments in each component time sequence and extracts features at the key moments, and then the features extracted based on the importance and the features extracted at the key moments are fused, so that the multi-scale features of the power load are captured; and then inputting the fused features into the dynamic gating residual connection LSTM network for prediction, and in the prediction process, improving the attention degrees of long-term sequences, short-term sequences and fluctuation sequences in different features through a residual modulation function, thereby more accurately capturing the multi-scale features of the power load and obtaining a prediction value of the power load.

The invention discloses an acoustic excitation digital modulation noise reduction method and system for laser acoustic vibration detection and application. Comprising the following steps: step 1, acquiring single-point measurement time sequence parameters of laser vibration measurement equipment, step 2, measuring response characteristics of an audio excitation device, and determining pre-stabilization time required by an audio excitation signal from starting to reaching a stable amplitude; step 3, constructing an on-off keying modulation function, generating a digital gating function according to the time sequence parameter and the pre-stabilization time, and performing time domain multiplication on the audio excitation signal and the digital gating function to generate a modulated intermittent audio excitation signal; and 4, controlling the audio excitation device to play intermittent audio excitation signals, and synchronously triggering the laser vibration measurement equipment to scan and collect the measurement points on the surface of the object to be measured according to the time sequence parameters. Through the on-off keying digital modulation technology, audio excitation can be started only in the effective detection time period of laser vibration measurement, and therefore the average noise level and equipment power consumption are remarkably reduced.

The invention provides an engineering construction monitoring method and system based on multi-source data fusion, and relates to the technical field of engineering construction monitoring. Structural vibration, wind power and multi-dimensional environment data are fused, a wind load modulation function and an environment correction model are constructed, the influence of a wind load nonlinear amplification effect and environment disturbance on vibration signals is effectively eliminated, and the accuracy of the vibration signals is improved. The accuracy and sensitivity of damage feature extraction are improved; meanwhile, in combination with a signal decomposition technology and multi-layer Bayesian reasoning, probabilistic evaluation and real-time risk early warning of the structural damage state are realized, the response capability and the discrimination capability of the monitoring system to structural state changes under complex working conditions are enhanced, and the precision and the reliability of health monitoring of the engineering building structure are improved.

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

Modulation-encoded light, using different spectral bin coded light components, can illuminate a stationary or moving (relative) target object or scene. Response signal processing can use information about the respective different time-varying modulation functions, to decode to recover information about a respective response parameter affected by the target object or scene. Electrical or optical modulation encoding can be used. LED-based spectroscopic analysis of a composition of a target (e.g., SpO2, glucose, etc.) can be performed; such can optionally include decoding of encoded optical modulation functions. Baffles or apertures or optics can be used, such as to constrain light provided by particular LEDs. Coded light illumination can be used with a focal plane array light imager receiving response light for inspecting a moving semiconductor or other target. Encoding can use orthogonal functions, such as an RGB illumination sequence, or a sequence of combinations of spectrally contiguous or non-contiguous colors.

The invention discloses a non-spectral infrared gas analysis system, which relates to the technical field of gas analysis, and comprises an infrared absorption cell used for receiving gas to be detected; the black-body radiation infrared light source is used for emitting infrared light to the infrared absorption cell; the gas to be detected is used for selectively absorbing infrared light; the light source driving modulation circuit is used for driving a black-body radiation infrared light source through a resistor of which the resistance value dynamically changes along with the temperature; the infrared detector is used for receiving the infrared light absorbed by the gas to be detected; the signal processing module is used for detecting the intensity change of the infrared light before the infrared light is absorbed by the gas to be detected and the intensity change of the infrared light after the infrared light is absorbed by the gas to be detected, converting the intensity change into an electric signal, and processing the electric signal to obtain a digital signal; and the controller is used for converting the digital signal into the concentration of the gas to be detected. According to the non-spectral infrared gas analysis system, a black-body radiation infrared light source is adopted, and the power consumption is reduced through a rapid electric modulation function.

The invention belongs to the technical field of time modulation arrays, and relates to a direction and polarization joint estimation method based on a time modulation array, which comprises the following steps: establishing an alternating polarization time modulation array, obtaining a receiving signal of each array element, a time modulation function and a polarization vector of each array element, and further obtaining an actual receiving signal of each array element, establishing a linear relation among a harmonic component, a polarization parameter and an incident direction of a received signal of each sub-array; according to the linear relation, the relation between direction disturbance and direction function disturbance is obtained, a vector formed by subarray harmonic components is rewritten into a form containing a noise item, error disturbance between a truth value of a direction function and a corresponding estimator is obtained, and then a direction estimation value is obtained; according to the linear relation, the relation between the polarization matching coefficient of the array manifold vector estimation value and antenna polarization and radiation source polarization is obtained, and then the polarization estimation value is obtained. According to the invention, joint estimation of direction and polarization can be realized.

The embodiment of the invention relates to the field of film measurement, and discloses a thickness measurement signal processing method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a sample thickness actual measurement signal generated by a to-be-measured sample through optical interference thickness measurement; the sample thickness actual measurement signal is modulated through a preset modulation function, a first processing signal is obtained, and the modulation function is generated based on overlapping parameters of an overlapping frequency band with the matching degree of an ideal thickness measurement signal of a preset thickness standard sample wafer and an actual thickness measurement signal of the thickness standard sample wafer reaching a preset standard in a frequency domain; the overlapping parameters comprise at least one of the central position, the width and the amplitude of the overlapping frequency band and the matching degree corresponding to the overlapping frequency band; and performing thickness analysis based on the first processing signal. According to the method, the frequency band carrying the correct thickness characteristic is screened out from the aliasing frequency and is purified, so that the thickness measurement and calculation precision of the signal containing noise is remarkably improved.

The application provides a phase optical element and a method for obtaining stable transmission of light intensity of non-diffraction light beams. The phase optical element having an equivalent light field modulation function to the amplitude optical element is used to replace the amplitude optical element, so that the light intensity distribution of the non-diffraction light beams is obtained. Compared with the amplitude optical element, the phase optical element has the advantages of small energy loss, low cost, easy processing and the like, and is suitable for more extensive practical applications.

The present invention discloses an intermittent sampling interference method and system based on pseudo-random sequence frequency shift modulation, which relates to the technical field of radar electronic countermeasures, including intermittent sampling of enemy radar signals to obtain intermittent sampling signals; setting a pseudo-random sequence and a frequency shift amount, constructing a frequency shift amount function and a frequency shift modulation function; using the frequency shift modulation function to modulate and forward the intermittent sampling signal to obtain a frequency shift modulation interference signal; then performing matched filtering processing, parsing the filtered interference signal to obtain an optimal frequency shift amount matrix; substituting the optimal frequency shift amount matrix into the filtered interference signal to obtain an optimal interference signal, and implementing interference on the enemy radar. The present invention causes false targets to randomly superimpose around the real target, forming strong false targets with random distributions of leading, nearby, and lagging; not only adjusting the amplitude and position distribution of the strong false targets, but also destroying the time-frequency distribution and spatial distribution characteristics of the intermittent sampling interference, having both suppression and deception interference effects.

An optical multiplexer includes: an coupled MMI optical multiplexing part formed by coupling, from an input side, a first MMI optical multiplexing part and a second MMI optical multiplexing part having a width narrower than the first MMI optical multiplexing part; two optical input side optical waveguides connected to the first MMI optical multiplexing part; and a single optical output side optical waveguide connected to the second MMI optical multiplexing part, wherein one light input side optical waveguide is a two-color propagation light input side optical waveguide for propagating a combined laser light composed of two laser lights having different wavelengths, and the other is a one-color propagation light input side optical waveguide for propagating one laser light having a wavelength different from the two laser lights, and the second MMI optical multiplexing part is disposed on an extension of the one-color propagation light input side optical waveguide.

The invention provides an optical multiplexer, an optical multiplexing member, an optical multiplexing member with an optical modulation function, a visible light source module, an optical engine, and XR glasses which can be reduced in size and reduced in optical loss compared with the prior art. An optical multiplexer (100) is provided with: an MMI-coupled optical multiplexer unit (50) in which a first MMI-type optical multiplexer unit and a second MMI-type optical multiplexer unit having a narrower width than the first MMI-type optical multiplexer unit are coupled; two optical input-side optical waveguides connected to the first MMI-type optical multiplexer unit; and one optical output-side optical waveguide connected to the second MMI-type optical multiplexer unit. One optical input side optical waveguide is a two-color propagation optical input side optical waveguide for propagating a combined laser beam comprising two laser beams having different wavelengths, and the other optical input side optical waveguide is a single-color propagation optical input side optical waveguide for propagating one laser beam having a wavelength different from that of the two different laser beams. The second MMI-type optical multiplexer is disposed on an extension line of the monochromatic propagation light input-side optical waveguide.

Methods, systems, and computer-implementable algorithms for determining time-varying pulses for a patient with an implantable stimulator device (ISD) are disclosed. At least one time-invariant tonic stimulation pulse parameter (e.g., amplitude, pulse width, or frequency) is modified by a modulation function to produce a time-varying pulse (TVP), and one or more measurements are made to determine the effectiveness of the TVP. The measurements can be objective and taken from the patient, and / or subjective and determined based on feedback from the patient. In one example, the objective measurements can include one or more features determined from an epidural spinal cord electrogram (ESG) signal detected by the ISD, which can include an evoked compound action potential. The one or more measurements are used to determine a score for the TVP, which is useful in selecting the best TVP for use with the patient, or for adjusting the modulation function applied to the tonic stimulation parameters.

The invention provides a design method of a dual-beam time modulator. The method comprises the following steps: expanding a time modulation function into Fourier series; keeping the amplitude weighted value of the target sideband consistent, and setting the amplitude weighted values of the other sidebands as 0; setting the initial phase of the target sideband as a certain value, and setting the initial phases of the other sidebands as 0; a + 1 secondary sideband and a-1 secondary sideband are selected as target sidebands, the initial phase of the + 1 secondary sideband is independently controllable, the amplitudes of the + 1 secondary sideband and the-1 secondary sideband are set to be 1, the initial phases are set to be delta phi and 0 respectively, and a dual-beam time modulation function with the adjustable initial phases is constructed; a programmable time modulator architecture is utilized to realize a dual-beam time modulation function with an adjustable initial phase.

The invention relates to a method configured for computing, by computer, data of an ophthalmic lens for manufacturing the ophthalmic lens using the data, the method comprising a step of generating data of a random modulation surface of the ophthalmic lens, and the method is characterized in that the data of the random modulation surface results from applying a continuous random surface modulation function or a scaled continuous random surface modulation function to a predefined surface of the ophthalmic lens.

The application discloses a spatial light modulator control method, a spatial light modulator and a control system, and relates to the technical field of spatial light modulator development and application. The method comprises the following steps: after obtaining addressing data and control data of a spatial light modulator, the addressing data and the control data are fused and encoded on resolution indication bits and bit depth indication bits in an addressing data format to obtain a video signal to be transmitted; then the video signal is transmitted to the spatial light modulator through a video signal transmission channel; the spatial light modulator parses the addressing data and the control data from the video signal; the corresponding light wave modulation function is completed according to the addressing data; and the corresponding control function is completed according to the control data. Thus, the interface requirement of an upper computer can be reduced, the purpose of transmitting signals by using the same interface and time sequence is achieved, the synchronous precision is high, the user operation is easy, and the method is convenient for practical application.

The present invention discloses a fatigue damage assessment method under uniformly modulated non-stationary non-Gaussian random loads, which relates to the field of random vibration fatigue damage assessment. The method includes obtaining a non-stationary random process based on a uniform modulation function, and defining the non-stationary random process obtained by modulating a stationary non-Gaussian random process as a true non-stationary non-Gaussian random process. Based on the EPSD decomposition method for non-stationary Gaussian fatigue damage assessment, the spectral method for stationary non-Gaussian fatigue damage assessment is incorporated to solve the random vibration fatigue damage of non-stationary non-Gaussian stress. The present invention further considers the situation where both non-stationarity and non-Gaussianity coexist in random vibration fatigue damage analysis. For non-Gaussianity, a more reasonable definition and division of the non-stationary random process are carried out, and the problem of random vibration fatigue damage assessment with both non-stationarity and non-Gaussianity is solved under the condition of a reliable precision spectrum.

Evaluation and adjustment of time-varying pulse patterns in spinal cord stimulator systems are disclosed. Methods, systems, and computer-implemented algorithms are disclosed for determining time-varying pulses for a patient having an implantable stimulator device (ISD). At least one time-invariant stimuli pulse parameter (e.g., amplitude, pulse width, or frequency) is modified by a modulation function to produce a time-varying pulse (TVP), and one or more measurements are made to determine the effectiveness of the TVP. The measurements may be objective and taken from the patient, and / or subjective and determined based on feedback from the patient. In one example, the objective measurements may include one or more features determined from electrospinal cord (ESG) signals detected by the ISD, which may include evoked composite action potentials. One or more measurements are used to determine a score of TVP, which is useful in selecting an optimal TVP for use with a patient, or in adjusting a modulation function applied to an ankylosing stimulation parameter.

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) general inductance integrated waveform optimization method and device and a medium, and the method comprises the steps: carrying out the optimization processing of information bits through employing an optimization algorithm, and generating reserved bits; deploying OFDM subcarriers by adopting a fragmentation and layering mode based on the reserved bits and the information bits, and coding each layer of bit plane to obtain a coded bit sequence; modulating the coded bit sequence of each layer of bit plane through a preset modulation function; and synthesizing the modulated bit sequence to generate an OFDM (Orthogonal Frequency Division Multiplexing) general inductance integrated waveform. According to the method, the peak-to-average ratio (PAPR) and the sidelobe ratio (PSLR) are suppressed, and meanwhile, the radar receiving end can correctly reconstruct the reference signal through a decoding technology.

The present invention discloses a security testing method and system for Face ID identity authentication, which belongs to the field of information security technology. The reference scattered image with different depth information generated by the original depth-sensing camera of the device under test is collected; the reference scattered image is preprocessed; according to the preprocessed reference scattered image with different depth information, a "depth information-infrared scattered displacement" mapping relationship is constructed based on the peak signal-to-noise ratio, and a depth mapping modulation function is obtained by polynomial fitting; the target depth image is modulated into the preprocessed reference scattered image with maximum depth information, and the pixel points in the infrared scattered image are reset to a preset size using a point spread function; the infrared scattered image to be tested is projected so that the original depth-sensing camera of the device under test obtains a false target depth image, thereby realizing security testing. The present invention can interfere with the imaging of the original depth-sensing camera, simulate non-existent depth information, and has high test accuracy.

The application discloses a current measurement method based on an optical fiber current sensor and belongs to the field of optical fiber sensing. The period of a basic digital square wave is composed of a current signal collection period and a vibration signal collection period, and the size is related to the round-trip time of the modulated light. The current phase shift and the vibration phase shift are collected in the two collection periods respectively, the first digital step wave and the second digital step wave are obtained according to the two phase shifts, the total phase of the optical fiber current sensor is kept at the sensitive point of pi / 2 in the current signal collection period through the reset and closed-loop modulation functions, the total phase of the optical fiber current sensor is kept at the insensitive point of 0 in the vibration signal collection period, the current signal and the vibration signal are obtained, the time of vibration occurrence is determined through the vibration signal, and the vibration filtering is performed on the current signal. The method can improve the measurement precision and stability and avoid the occurrence of false locking accidents.

The present application relates to the field of computational imaging technology, and in particular to a CIS system for elemental imaging, which includes: a main imaging system, a microlens array, an image acquisition unit, a first mask arranged before and after the microlens array, including on the microlens array, and a second mask arranged near the main imaging system, including on the main imaging lens and before the microlens array, wherein the main imaging system is used to obtain a first image of a target object; the first mask is used to amplitude modulate the first image, and the microlens array is used to phase modulate the optical path of the first image using a preset phase modulation function to obtain a second image of the target object; the first mask is used to mask modulate the second image using a preset first mask modulation function, introducing more uniform spectral aliasing, and obtaining light field information of the target object, so that the image acquisition unit generates a final image based on the light field information. Therefore, the light field acquisition method based on two microlens arrays with added masks improves sampling efficiency and light field imaging and reconstruction quality, and also solves the problems of high cost and large volume when a camera array adds a mask between the camera lens and the sensor to achieve light field acquisition.

The present invention provides a method for calculating an optical modulation transfer function based on a knife-edge image, comprising the following steps: using an optical modulation function measurement device to collect a knife-edge image and converting the knife-edge image into a grayscale image; calculating the knife-edge rising edge width of the grayscale image; performing a convolution operation on the grayscale image using a differential template matrix to obtain an LSF image; identifying the edge coordinates of the LSF image, and then rotating the LSF image using an affine transformation; and then performing a discrete Fourier transform to obtain an optical modulation transfer function curve. The optical modulation transfer function calculation method provided by the present invention calculates the average value of the rising edge pixel width of each row to obtain a corresponding adaptive differential convolution template, then convolves the knife-edge image to obtain a line spread function (LSF) image, and finally obtains an optical transfer function curve through a discrete Fourier transform. Because the differential method of this method relies on an adaptive differential template to perform convolution, it effectively removes noise.

To provide an optical multiplexer which is connectable to or can be integrated with an optical modulator using a lithium niobate film, and which can be more downsized than before.SOLUTION: An optical multiplexer 100 according to the present invention multiplexes a plurality of laser beams differing in wavelength, and comprises an optical multiplexing unit 50, a plurality of optical input-side optical waveguides 21-1, 21-2, 21-3 connecting thereto, and one optical output-side optical waveguide 22T connecting to the optical multiplexing unit 50, with the optical multiplexing unit 50 composed of one stage or multiple stages of MMI-type optical multiplexing units. The optical input-side optical waveguides 21-1, 21-2, 21-3 have a trapezoidal cross section, and the optical multiplexing unit 50 and the optical output-side optical waveguide 22T have a trapezoidal or a rectangular cross section. The lower side internal angles α21, α22 of the trapezoidal or a rectangular cross section of the optical multiplexing unit 50 and the optical output-side optical waveguide 22T are larger than at least one of the two lower side internal angles α11, α12 of the trapezoidal cross section of the optical input-side optical waveguides 21-1, 21-2, 21-3.SELECTED DRAWING: Figure 1

A polishing method includes: holding a substrate against the polishing surface of a polishing pad using a carrier head; generating relative movement between the substrate and the polishing pad; applying a first pressure modulated by a first modulation function to a first region of the substrate; applying a second pressure modulated by a second modulation function orthogonal to the first modulation function to a second region of the substrate; monitoring the substrate with an in-situ friction monitoring system to generate a sequence of measurements during the polishing of the substrate; and determining the relative contribution of the first region and the second region to the sequence of measurements based on distinguishing between a first frequency and a second frequency.

The application belongs to the technical field of time modulation array, and relates to a direction and polarization joint estimation method based on a time modulation array, which comprises the following steps: establishing an alternating polarization time modulation array, obtaining the received signal of each array element, a time modulation function and the polarization vector of each array element, then obtaining the actual received signal of each array element, and establishing a linear relationship among the harmonic component of each subarray received signal, a polarization parameter and an incident direction; according to the linear relationship, obtaining the relationship between the direction disturbance and the direction function disturbance, rewriting the vector formed by the subarray harmonic component into a form containing a noise term, obtaining the error disturbance between the true value of the direction function and the corresponding estimation quantity, and then obtaining the estimation value of the direction; according to the linear relationship, obtaining the relationship between the polarization matching coefficient of the array manifold vector estimation value and the antenna polarization and the polarization of the radiation source, and then obtaining the estimation value of the polarization. The application can realize joint estimation of the direction and the polarization.

The utility model discloses a handheld radio station with a train dispatching function, and relates to the technical field of wireless communication, the handheld radio station with the train dispatching function comprises an antenna, a battery, a mainboard, a loudspeaker and a microphone, the mainboard is electrically connected with the antenna, the battery, the loudspeaker and the microphone, and the battery is used for providing electric energy for the handheld radio station; wherein the main board is provided with a vocoder, a control unit, a radio frequency unit and a signal processing unit, and the control unit is electrically connected with the vocoder, the radio frequency unit and the signal processing unit; the microphone and the loudspeaker are both connected to the vocoder; the radio frequency unit is electrically connected to the antenna. According to the utility model, the analog-to-digital converter and the digital-to-analog converter are arranged in the hand-held radio station, the hand-held radio station sends and receives digital modulation signals, and the digital modulation signals are used for transmission, so that the anti-interference performance of the signals is enhanced; and meanwhile, an encoder and a decoder are added in the handheld radio station, so that the safety of signals is enhanced.

The invention discloses a high-noise transmission electron microscope under-focus sequence image registration method and device, and the method comprises the steps: employing the synergistic effect of frequency domain modulation and information entropy optimization, specifically, extracting the amplitude information of a structure signal through Fourier transform, combining with a multi-type frequency domain modulation function, and obtaining an under-focus sequence image of a high-noise transmission electron microscope. Noise spectrum energy suppression and effective signal frequency band enhancement are realized in a frequency domain; mutual information calculation is carried out on the basis of the image after frequency domain modulation, and the defect that traditional intensity matching is sensitive to noise is overcome by utilizing non-linear relevance of frequency domain signal statistical distribution, so that robust registration is driven.

The present application relates to a kind of microlens array refractive power distribution modulation method, application, verification method and vision correction element, comprising the following steps: constructing space weight modulation function to the refractive power of each microlens is dynamically modulated, the refractive power of each microlens from center to edge smooth transition, adjacent microlens curvature is continuous, adjacent microlens has continuous curved surface / step surface and refractive power at boundary;Wherein, the curved surface / step surface position between adjacent microlenses, curved surface / step surface slope and curved surface / step surface curvature smooth connection.The modulation method of the present application is dynamically modulated to the refractive power of each microlens, the refractive power of each lens in microlens array from center to edge smooth transition, and through single parameter adaptation different refractive power demand, user no longer perceives the sudden change of correction degree when scanning across lens boundary, and viewing experience is uniform and comfortable, belong to optical element design technical field.

The present invention relates to a method for improving the Doppler tolerance problem of NLFM signals, and belongs to the technical field of radar signal processing. The method for improving the Doppler tolerance problem of NLFM signals is a solution to the pulse compression performance and main lobe peak delay problems of NLFM signals with Doppler frequency shift. On the one hand, spectrum correction filtering is used to improve the signal pulse compression performance. The spectrum correction filter is designed by making the spectrum correction filter output an ideal window function, thereby significantly suppressing the sidelobe level of the pulse compression result of the NLFM signal with Doppler frequency shift. On the other hand, to address the waveform main lobe peak delay problem caused by Doppler frequency shift, the true peak position of the echo signal is calculated by taking the average of the main lobe peak time of the pulse compression waveform under positive and negative frequency modulation functions, thereby avoiding the influence of Doppler frequency shift on radar ranging.