178 results about "Filter design" patented technology

The invention discloses an online iterative learning control method and device based on bidirectional frequency binary search, and belongs to the technical field of tracking control, and the method comprises the steps: building a piezoelectric positioning system, and enabling the piezoelectric positioning system to have a certain low-frequency disturbance suppression capability while keeping stable through adjusting the parameters of a proportional-integral controller; constructing a control structure combining a YK parameterization method and iterative learning control; constructing a robust filter in iterative learning control by adopting a filter design method of a parallel cascade composite structure; a differential parameter constraint space is set for each filter based on a bidirectional frequency binary search method, and iterative updating of filter parameters is driven in a time domain by taking norm minimization of system errors as an optimization target, so that continuous optimization of online disturbance suppression performance is realized. According to the method, YK parameterization and an iterative learning control structure are combined, and the stability of the piezoelectric positioning system in the whole frequency domain can be ensured.

The invention relates to the technical field of electromagnetic compatibility, in particular to a new energy automobile electronic part EMC (Electro Magnetic Compatibility) multi-dimensional simulation verification method, which comprises the following steps of: based on a geometric structure and material attributes of a new energy automobile electronic part, identifying an abnormal field intensity region, extracting a signal path and an electromagnetic wave incident direction, and analyzing an overlapping relationship between the signal path and the electromagnetic wave incident direction; according to the method, the electromagnetic field distribution and the interference source of the parts are accurately modeled and analyzed, the shielding and filtering design is optimized, the electromagnetic compatibility is improved, the interference coupling point is identified, the shielding effectiveness and the filtering effect are evaluated, the optimization policy is identified, the electromagnetic field distribution after optimization is analyzed, the fluctuation data of the external electromagnetic field is captured, and the influence evaluation list of the external electromagnetic field is generated. The reliability of the design under actual working conditions is ensured, electromagnetic interference is prevented, stable work of parts in a variable electromagnetic environment is ensured, the electromagnetic compatibility of the whole automobile is improved, the influence of electromagnetic interference on the functions of the new energy automobile is reduced, the design effect is optimized, and the performance and safety are improved.

An apparatus (10, 110) comprising: means for transmitting, to a second apparatus (120), first information (901) indicative of a capability of the apparatus to adapt at least one of: a design of a frequency-domain spectral shaping, FDSS, filter (902) for FDSS-based orthogonal frequency division multiplexing, OFDM, transmission, or a spectral extension parameter (903) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (904), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (906) for generating training data for training a machine learning, ML, based FDSS filter; and means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the FDSS filter design (909) or a first spectral extension parameter (910), at least a first FDSS-based OFDM transmission (908) to the second apparatus.

The invention discloses a fusion type distributed optical fiber vibration sensing system with broadband response, which is suitable for high-precision acoustic signal measurement and spatial position positioning. The system comprises an acoustic measurement unit, a position measurement unit and a data acquisition synchronous control module which are respectively used for acquiring high-frequency vibration information and positioning low-frequency signals, has the sensing capabilities of wide band, high resolution and high signal-to-noise ratio, and realizes signal synchronization by adopting phase-locked control and high-sampling-rate data acquisition, so that the accuracy of signal synchronization is improved. And the signal stability and the signal-to-noise ratio are improved through polarization control and filtering design. The method supports frequency feature extraction, accurate identification and spatial positioning of the vibration event, and is suitable for pipeline structure monitoring, fault diagnosis and other engineering application scenes in a complex environment.

A method of processing video data performed by a decoder includes: decoding a bitstream to obtain video data and coding information, the coding information comprising weighting map indication information for defining a weighting map and filter coefficients optimized for the weighting map; obtaining a picture block based on the video data; upsampling the picture block; determining the weighting map using the weighting map indication information; and obtaining an enhanced picture block by applying a signal enhancement filter using the filter coefficients, together with the weighting map, to the upsampled picture block.

The invention relates to the technical field of radio frequency filters, in particular to a 13GXBAR filter design method based on a lithium niobate film. The Euler angle of the lithium niobate thin film is subjected to simulation setting in finite element simulation software, admittance responses under different cutting angles are obtained, an admittance curve with a large electromechanical coupling coefficient and complete stray mode suppression is obtained, the tangential angle is used for simulating an electrode material, the interdigital logarithm, the interdigital distance, the thin film thickness and the metallization ratio, and an admittance curve with a large electromechanical coupling coefficient and complete stray mode suppression is obtained. The method comprises the following steps of: constructing a plurality of resonators, obtaining impedance of each resonator, obtaining material parameters of the corresponding resonator, constructing a three-dimensional force-electricity coupling model of the lithium niobate resonator, carrying out layout design on the physical model in finite element simulation software through a field-circuit coupling method, and coupling force-electricity-sound multi-physical fields to obtain an S parameter curve of the designed XBAR filter; and whether the S parameter result is consistent with the target is verified, so that the forward design of full-simulation driving is realized.

This invention discloses a filter physical perception optimization method based on residual attention and transposed convolution, comprising the following steps: constructing a filter characteristic prediction surrogate model based on residual self-attention mechanism and transposed convolution decoding to establish a nonlinear mapping relationship between filter geometric parameters and electromagnetic response parameters; training the filter characteristic prediction surrogate model using an S-parameter weighted mean square error loss function to obtain a trained filter characteristic prediction surrogate model; and using a physical perception-improved differential evolution algorithm, employing the trained filter characteristic prediction surrogate model as a predictor to find the optimal combination of geometric parameters that satisfies the filter design specifications in the solution space. This method is a filter optimization design method that balances high-precision prediction and high-efficiency optimization. This method can predict the S-parameters of microwave filters more accurately than traditional neural networks, effectively replacing time-consuming full-wave electromagnetic simulation.

A robot force control method based on a diffusion model belongs to the field of robot control, and comprises the following steps: collecting 6D force / torque data and pose data of a robot end effector, and preprocessing the collected data; constructing a diffusion model and training; designing and integrating a dynamic system filter; force control instruction generation and robot control closed loop: collecting a current tail end pose and historical five frames of 6D force / torque data in real time, inputting the data into a diffusion model for reasoning, and inputting a predicted value output by the diffusion model into a dynamic system filter to generate a real-time force control instruction; and the force control instruction is converted into the pose adjustment amount of the robot end effector according to the robot dynamic model, the pose adjustment amount is sent to the robot controller, the robot is driven to execute actions, and the force control effect is verified through the next round of data acquisition. According to the method, the zero sample migration capability and robustness are remarkably improved, the real-time performance and the control frequency matching degree reach the standard, the task application range is expanded, and the economic and social benefits are remarkable.

The application belongs to the technical field of electromagnetic compatibility control design, and particularly relates to a marine low-ground-capacitance filter design method. The method specifically comprises the following steps: firstly, using an inductor as a main filter device, for a low-frequency band below 100 kHz, a magnetic core of the inductor uses an iron-based nanocrystalline material, for a low-frequency band from 100 kHz to 1 MHz, the magnetic core of the inductor uses MnZn magnetic material, and for a high-frequency band above 1 MHz, the magnetic core of the inductor uses NiZn magnetic material; secondly, based on the designed inductor, a multi-stage filter circuit combining low frequency and high frequency is designed; the filter circuit comprises: a plurality of common-mode inductors connected in series, a differential-mode capacitor Cx connected in parallel to both ends of the common-mode inductor, a common-mode capacitor Cy connected in parallel between a live wire and the ground, and a common-mode capacitor Cy connected in parallel between a zero wire and the ground; finally, modular packaging and glue filling are performed, so that the inductor of the filter circuit is parallel to the shell, the center position of the filter circuit is located at the center position of the shell, and overall insulation glue filling is not performed.

The utility model relates to the technical field of thermal steady-state salt treatment devices, in particular to a detachable pre-filtering cleaning device for removing thermal steady-state salt, which comprises a pretreatment box, a plurality of groups of longitudinal parallel filter screens which are detachably mounted and a pH (potential of hydrogen) adjusting bin. The filter screen is of a two-section type plate frame structure, plate frames on the two sides are connected with inserting plates through inserting grooves and provided with supporting and moving assemblies, a screw cylinder is rotated to drive a screw rod, and the plate frames are controlled to move relatively so as to compress the end buffering sealing gasket or be separated and detached. The supporting transfer rods and the fastening plates are matched with the inner wall of the pretreatment box to achieve stable positioning. According to the device, quick mounting and dismounting are realized through modular design, the problem that a traditional fixed filter screen is inconvenient to clean is solved, meanwhile, the multi-stage filtering design is adaptive to different particle impurities, and the pre-filtering efficiency and the stability of an amine liquid treatment system are improved.

The invention discloses a pouring data-based filter design method, which comprises the following steps of: acquiring pouring variables and configuration variables in a plurality of filter samples, and determining a pouring liquid filtering result of the plurality of filter samples; screening a plurality of filter samples based on the filtering result, performing first processing on pouring variables of the screened filter samples to obtain a plurality of sample features, and constructing a feature matrix of the filter samples; constructing a prediction model by using the feature matrix and the configuration variables; the required pouring variables are calculated and preprocessed and then input into the prediction model, and the filtering piece is designed according to the value interval of the configuration variables output by the prediction model, so that the pouring liquid flows through the filtering piece more quickly on the premise of ensuring the high impurity filtering rate, the filtering efficiency is improved, and meanwhile, the manufacturing cost control of the filtering device is facilitated.

An apparatus (10, 100) comprising: means for transmitting, to a second apparatus (120), first information (1101) indicative of a capability of the apparatus to adapt at least one of: a design of a first frequency-domain spectral shaping, FDSS, filter (1102) for FDSS-based orthogonal frequency division multiplexing, OFDM, transmission, wherein the first FDSS filter design is matched with a design of a second FDSS filter of the second apparatus, and wherein at least one of the first or second FDSS filter designs has trainable operational parameters; or a spectral extension parameter (1103) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (1104), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (1106) for training the operational parameters of at least one of the first or second FDSS filter designs; and means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the first FDSS filter design (1109) or a first spectral extension parameter (1110), at least a first FDSS-based OFDM transmission (1108) to the second apparatus; receiving, from the second apparatus, third information (1112), for use in training the operational parameters of the first FDSS filter design, wherein the third information is based at least in part on the first FDSS-based OFDM transmission received at the second apparatus via the second FDSS filter design; and training the operational parameters of the first FDSS filter design based at least in part on: the first FDSS-based OFDM transmission, and the third information.

This invention discloses a miniaturized, wide-stopband low-pass filter design method, covering 3D model design, simulation optimization, circuit fabrication and testing, and design verification based on dielectric integrated suspension line technology. The core of the low-pass filter design is based on dielectric integrated suspension line technology. Furthermore, the core circuit of this filter employs three layers of surface-mount capacitors and a double-layer spiral inductor to reduce circuit size, while combining a honeycomb structure to extend the stopband. Compared to traditional circuit designs, the implemented filter exhibits self-encapsulation characteristics, achieving low insertion loss and an ultra-wide stopband range, providing an important basis for filter performance optimization.

The invention provides a corrugated low-pass filter design method and device.The method comprises the steps that an input matching section used for input waveguide port matching, a main suppression section used for wide stop-band suppression and an output matching section used for outlet waveguide port matching are sequentially arranged in the electromagnetic wave direction to form an arrangement structure, the arrangement structure is symmetrical along the narrow side gap of the first width; arranging the band elimination units in the arrangement structure at equal intervals, determining an initial trend of a main suppression section envelope line by using an incremental function, determining initial trends of input matching section and output matching section envelope lines by using a windowing function, and determining heights of all the band elimination units according to the initial trends; and keeping the height of the band elimination unit unchanged, compressing the narrow-side gap at the center position of the filter from the first width to the second width, and adaptively adjusting the width change of the narrow-side gap to obtain the ripple low-pass filter. According to the invention, an additional impedance converter is not needed, a stop band covering a complete frequency band can be formed, and a high-frequency spurious mode is effectively suppressed.

This invention provides a control method and system for a robotic arm used in oil sample collection at a converter station. The method includes: constructing a kinematic model, a dynamic model, and a three-stage cascaded motor system model; designing a non-matched composite disturbance filter; designing a switching preset finite-time time-varying convergence function, and constructing a first control signal generation function based on the switching preset finite-time time-varying convergence function; designing a state constraint function based on dynamic boundaries, and calculating dynamic boundary parameters using the pole placement method, then substituting the dynamic boundary parameters into the state constraint function to obtain the dynamic boundaries; performing expected convergence on the first control signal generation function based on the non-matched composite disturbance filter function and the dynamic boundaries to obtain a second control signal generation function, and obtaining the control signal for the robotic arm based on the second control signal generation function. This invention can meet the requirements of high-precision, stable, and safe oil sample collection operations in the complex environment of a converter station.

The present application relates to a kind of multi-module ship finite time fast collaborative obstacle avoidance control method, program, equipment and storage medium.The present application considers the requirement of multi-module ship to formation speed when executing task, based on backstepping method and finite time instruction filter, finite time distributed formation controller is designed;Using function segmentation design idea, dynamic artificial potential field method is used to realize formation to avoid static obstacles, avoid dynamic obstacles and dynamic collision avoidance between module ships, and static obstacle avoidance, dynamic obstacle avoidance and dynamic collision avoidance control item in formation control rate are designed;While considering the influence of external interference, finite time disturbance observer is added to estimate external time-varying disturbance;In order to reduce module ship communication consumption and prolong controller update cycle, event trigger mechanism is introduced into the multi-module ship collaborative formation controller.The present application can ensure that multi-module ship formation is stable, safe and executes task under the condition of environmental disturbance.

The invention discloses an anti-symmetric filter design method based on an anti-auto-inverse matrix theory, and belongs to the technical field of digital signal processing. According to the method, a design problem of an antisymmetric filter is modeled into an optimization problem of an impulse response vector h, and an inverse self-inverse constraint h =-Jh (J is an inverse unit matrix) is applied, so that an optimization target minize | A -d | is constructed. An iterative solution technology of a generalized coupling Sylster transpose matrix equation is adopted, and through parameter initialization, residual matrix updating, step length dynamic adjustment and anti-auto-back projection operation, it is ensured that a filter coefficient strictly meets antisymmetry. Furthermore, the calculation complexity is reduced by using block calculation, fast multiplication and a precondition technology, and the frequency domain performance is optimized in combination with a weighted least square method and a Lagrange multiplier method. According to the filter designed by the invention, the strict linear phase characteristic is maintained, meanwhile, the stop-band attenuation can reach more than 50dB, the gradient of a transition band is improved by 30%, and the group delay fluctuation is controlled within 0.1 sampling point, so that the filter is suitable for medical image and radar signal processing and high-fidelity audio systems, and has the characteristics of high calculation efficiency and excellent performance.

The invention discloses a reconfigurable filter design method based on a numerical control adjustable zero point technology, an MOS switch array is directly driven by using a digital control signal, an external DAC is not needed to generate an analog control voltage, the problems that an analog circuit is complex, the precision is limited and the system size is increased are avoided, a mode switching module adopts a programmable multi-switch structure, and the design efficiency is improved. By changing the connection mode of the high-pass filter and the reconfigurable low-pass filter, flexible switching among all-pass, low-pass, high-pass and band-pass modes can be realized, and various filtering functions can be completed by a single chip. The whole filter structure is realized based on a standard CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process, an external transmission line or a variable capacitance element is not needed, the area occupation and the parasitic effect under a low-frequency band are reduced, the system integration level and the reconfigurability are remarkably improved, and the filter realizes the effects of small size, simple control, stable frequency response and easy integration; the defects that in the prior art, the size is large, DAC control is relied on, and frequency band application is limited by a transmission line structure are comprehensively overcome.

The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to a design method of an asymmetric three-passband filter based on a frequency-variable coupling structure. According to the method, a frequency-dependent coupling structure is applied to the design of the asymmetric three-passband filter based on the REMEZ-like algorithm, and after a frequency-dependent coupling matrix corresponding to a topological structure is converted into a non-frequency-dependent coupling matrix, all unknown parameters of the frequency-dependent coupling matrix are optimized and solved through a constrained nonlinear minimization function; therefore, an original cross coupling path is eliminated; and the generated N-1 transmission zeros can be generated and independently controlled by the frequency-variable coupling structure, so that the topological structure of the filter is simplified, and the debugging complexity is reduced. The three-passband filter with different orders, return losses and bandwidths can be synthesized in different passbands and specified transmission zero points, an in-line topological structure is achieved, the difficulty of filter design and simulation is lowered, and the degree of out-of-band rejection and isolation between the passbands is greatly improved.

An apparatus (10, 110) comprising: means for transmitting, to a second apparatus (120), first information (1301) indicative of a capability of the apparatus to adapt at least one of: a design of a frequency-domain spectral shaping, FDSS, filter (1302) for FDSS-based orthogonal frequency division multiplexing, OFDM transmission, or a spectral extension parameter (1303) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (1305), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (1306) in which a performance of the FDSS filter design is monitored; means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the FDSS filter design (1309) or a first spectral extension parameter (13010), at least a first FDSS-based OFDM transmission (1308) to the second apparatus; receiving, from the second apparatus, third information (1312), wherein the third information is based at least in part on the at least first FDSS-based OFDM transmission received at the second apparatus; and monitoring the performance of the FDSS filter design based at least part on the third information.

The invention provides a hybrid event trigger fault detection method for a fuzzy Markov jump system, and the method comprises the following steps: for a discrete time T-S fuzzy Markov jump system, considering the modal asynchronism between the system and a fault detection filter and the asynchronism of a membership function at the same time based on a hidden Markov model and a non-parallel distributed compensation strategy; introducing a double-asynchronous fault detection filter; considering system measurement output and network communication between filters, and introducing an adaptive event triggering mechanism; the mismatching degree of the membership function is integrated into an event triggering condition, a hybrid event triggering mechanism is introduced, and the phenomenon of the mismatched membership function is processed; constructing a fault detection closed-loop system; and fault detection performance analysis and fault detection filter design are realized. The invention designs a hybrid adaptive event triggering scheme. The mismatching degree of the membership function is integrated as a part of a trigger mechanism, so that the mismatching problem is effectively solved while the trigger condition is ensured.

The utility model discloses a topological structure, a filter and communication equipment. The topological structure comprises an input end, an output end, a parallel line, a first parallel three line, a second parallel three line, a first short-circuit branch knot and a second short-circuit branch knot, one end of the parallel line is connected with one end of the first parallel three-line and one end of the first short-circuit branch, the other end of the first parallel three-line is connected with the input end, the other end of the first short-circuit branch is used for grounding, and the other end of the parallel line is connected with one end of the second parallel three-line and one end of the second short-circuit branch. The other end of the second parallel three-wire is connected with the output end, and the other end of the second short-circuit branch is grounded; wherein the first parallel three line, the second parallel three line, the first short-circuit branch knot and the second short-circuit branch knot are symmetrical about the parallel line. By means of the mode, the broadband band-pass filter designed based on the topological structure has high selectivity, the signal transmission quality can be improved, and noise can be reduced.

The invention discloses a high-temperature superconducting band-pass filter design method and system, a storage medium and equipment. The method comprises the following steps: firstly, determining design indexes including center frequency, relative bandwidth and the like and an extensible structure framework formed by cascading a plurality of coupling lines and more than one branch line; respectively establishing a differential-mode equivalent circuit model and a common-mode equivalent circuit model of the filter according to a transmission line theory; then constructing a multilayer perceptron type circuit-level physical information neural network model with residual connection, inputting design indexes into the model, and embedding an equivalent circuit matrix and a target differential mode transmission function into a loss function to complete training; and outputting coupling line even-mode and odd-mode characteristic impedance and branch line characteristic impedance through the trained model, and generating a filter physical layout according to the output coupling line even-mode and odd-mode characteristic impedance and the branch line characteristic impedance. The method fuses the physical information neural network, can quickly generate the superconductive filter layout, and effectively improves the design efficiency and prediction precision.

The utility model relates to the technical field of microwave devices, in particular to a high-power cavity low-pass filter. According to the utility model, through a distributed semi-lumped mode, a series inductance equivalent circuit of the low-pass filter with the lumped element having the zero point is realized by using the inductor, and a parallel series resonance equivalent circuit of the low-pass filter with the lumped element having the zero point is realized by using the high impedance line and the low impedance line; the problems that a low-pass filter designed at a low frequency band is large in size (in the length direction of a main finger) or large in insertion loss under the condition of 15-order or more high inhibition in the prior art are solved; the problem that a 15-order or more cavity low-pass filter designed at a high frequency band is difficult to process is solved; and the suppression and insertion loss performance is improved. Under the same inhibition requirement, miniaturization and low insertion loss are realized; under the same volume requirement, the out-of-band rejection is improved; compared with a common low-insertion-loss sugar-coated haw low-pass filter, the processing precision requirement is reduced.

This invention discloses a secure Tobit filtering method based on a three-wheel Ackerman steering model. The method includes the following steps: 1. Establishing a three-wheel Ackerman steering model with spoofing attacks and censoring measurements; 2. Designing a secure Tobit filter for the three-wheel Ackerman steering model; 3. Calculating the upper bound of the prediction error covariance matrix of the three-wheel Ackerman steering model at time h; 4. Calculating the gain matrix K of the three-wheel Ackerman steering model at time h+1. h+1 5. K h+1 Substitute into step two to obtain the filtering judgment at time h+1. If h+1 < Y, then proceed to step six; step six, through K... h+1 The upper bound of the filter error covariance matrix of the three-wheel Ackerman steering model at time h+1 is calculated, and h = h+1 is set. The process is repeated until h+1 = Y. This invention solves the problem that existing secure Tobit filtering methods cannot simultaneously handle censoring measurements and spoofing injection attacks in nonlinear filtering.

The invention discloses an interpolation filter design method based on fuel measurement signal multi-phase decomposition, and belongs to the technical field of filter digital signal processing. According to the method, the cut-off frequency and transition band characteristics of an interpolation filter are optimized through the multi-sampling-rate conversion theory and the multi-phase decomposition technology, and filtering parameters are dynamically adjusted in combination with an adaptive algorithm; the high-precision reconstruction of a fuel measurement signal is realized; the core is that a rear digital low-pass filter is designed, a frequency spectrum compression and expansion technology is used for inhibiting an aliasing effect, and calculation efficiency is improved through a multiphase decomposition structure; the method is especially suitable for an aviation fuel measurement system, can balance data redundancy and signal fidelity under different sampling rates, and significantly improves the measurement precision and the system stability.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure provides a method and a device for filtering-based channel estimation. A method comprises configuring a filter design with a stopband region between at least two bandpass regions in a time domain associated with channel behavior, suppressing, via the filter design, multi-user interference (MUI) or orthogonal cover code (OCC) interference in the time domain, and providing frequency domain-based channel estimation (CE) based on the filter design.

The invention discloses a dynamic positioning control method for a full-drive ship. The dynamic positioning control method comprises the following steps: (1) establishing a three-degree-of-freedom mathematical model of the full-drive ship; (2) based on the three-degree-of-freedom mathematical model, establishing a ship observer kinetic model, fusing data of position, speed and acceleration sensors, and outputting observation values including position, speed, acceleration and low-frequency load components; (3) designing an acceleration feedforward controller based on the state variable observation value, and designing an acceleration feedback controller based on a low-pass filter; and (4) calculating control input by adopting a composite PID (Proportion Integration Differentiation) controller combined with acceleration feedforward and acceleration feedback to realize full-drive ship dynamic positioning control. According to the invention, the resistance of the ship to external environment interference can be enhanced, and the control precision is improved.