113 results about "Constant coefficients" patented technology

The invention relates to a method for monitoring the respiration activity of a subject, comprising the acquisition of a sensor signal of at least one Doppler-Radar sensor representing the respiration activity of a subject, the transformation of the sensor signal into a transformation signal being a series according to Formula (I) where a_k is a set of predetermined constant coefficients specific for one individual subject, and processing the transformation signal S(t). The transformation signal can be analysed with basic signal processing techniques that are applied in the field of inductive plethysmography. The invention is further related to a corresponding monitoring system.

A brake system control method determines vehicle operating conditions, compares the conditions to an allowable range, and uses a neural network to predict an expected coefficient of friction when the conditions are within the range. When the conditions fall outside of the range, the method determines an amount of required braking force using a constant coefficient of friction, and calculates the required braking force using the expected coefficient of friction when the conditions are within the range. The vehicle operating conditions include a vehicle speed, brake pressure, modeled brake rotor temperature, and apply state. The expected coefficient is multiplied by a constant or a calculated correction factor. A vehicle has an engine, transmission, and braking system, with a controller and an algorithm for predicting a coefficient of friction for two brake rotors, calculating a hydraulic brake pressure, and for applying the braking system using the hydraulic brake pressure.

The invention discloses an inverter droop control method capable of achieving secondary frequency modulation and pressure regulation and belongs to the technical field of distributed power supply inverter output control. According to the inverter droop control method capable of achieving secondary frequency modulation and pressure regulation, aiming at the defect that a traditional local inverter droop control method can not achieve secondary frequency modulation and pressure regulation, with the restriction of the purpose of meeting the upper limit, the lower limit and the specified working point of power output of an inverter, an S-shaped droop control curve is constructed based on a traditional droop control curve with the specified working point as a middle transition point; modeling is achieved by means of a cubic function or a piecewise function, traditional droop control constant coefficients are replaced with a quadratic function, so that power output can be adjusted dynamically along with load change; due to the fact that when a traditional electric generator operates under the control of a frequency modulator / pressure regulator, the movement track of the intersection point of the secondary frequency modulation and pressure regulation power output curve of the electric generator and a load characteristic curve is an S-shaped curve, the curve can be directly used for controlling the inverter, and then secondary frequency modulation and pressure regulation are achieved, and operation performance of the inverter is better than that when the inverter is under traditional droop control.

The invention discloses an implementation method of a high-speed reed-solomon (RS) codec based on a field programmable gate array (FPGA), comprising FPGA implementation of a high-speed RS (244, 212) coder and FPGA implementation of a high-speed RS (244, 212) decoder. In the invention, the high-speed RS coder is a circuit based on polynomial division, and the high-speed RS decoder is based on three-level pipeline architecture, and dual-clock driving based on clock i_clk and reverse clock i_clk180 is adopted; In addition, based on a common Galois field (GF) multiplying unit, three basic computing units, including a constant coefficient GF multiply-add fused unit, a constant coefficient GF multiplying unit and a dual-clock period controlled GF multiplying unit are provided, thereby greatly improving the computing speed and reducing hardware complexity. The implementation method has the advantages of high supporting throughput rate and strong capacity of correcting burst errors and can be applied to many aspects.

The present invention provides a method and apparatus for quickly and efficiently processing an error correction polynomial to locate bit errors using a Chien search algorithm. In accordance with the present invention, it has been determined that multiplying the Λ coefficients of the error locator polynomial by a scaling vector prior to performing the Chien search algorithm matrix operations, it possible to use constant coefficients in the matrix multiply logic. This enables a relatively small amount of logic to be used to perform the matrix multiplication operations of the Chien search algorithm. The Chien search algorithm logic of the present invention is configured to perform many matrix multiply operations in parallel, which enables the Chien search algorithm to be executed very quickly to locate the bit errors in the error locator polynomial. Such a large number of matrix multiply operations would normally require a very large number of gates. However, the constant coefficient matrix multiply logic configuration of the present invention that is made possible by the aforementioned scaling significantly limits the amount of logic needed to perform the matrix multiply operations. Therefore, the present invention enables very high-speed throughput with respect to error correction, and does so using a relatively small amount of logic. This renders the decoder of the present invention suitable for use in high data rate systems. Furthermore, the use of a relatively small amount of logic limits area and power consumption requirements.

The invention discloses a DCT (Discrete Cosine Transform) realizing method comprising the following steps of: 1. serially inputting data in an M*M image data block to M registers; 2. outputting the data to a multiplication module by the registers, multiplying the data with a constant coefficient matrix stored in the multiplication module and sending the result to an addition module; 3. summating the data by the addition module and outputting the result; 4. storing the data into a storage module row by row or column by column in an M*M matrix way to form an M*M data block to finish a one-dimensional DCT operation; and 5. inputting the data in the storage module into the other M registers row by row or column by column, and repeating the steps 2 and 3 to finish two-dimensional DCT operation. The invention also discloses a DCT realizing circuit comprising a one-dimensional operation circuit and a two-dimensional operation circuit which both adopt a serial operation way with rapid operation and without deserialization. The DCT realizing circuit has a stronger capacity of resisting disturbance and a function of interrupt recovery.

A parametric elastic vibration analysis method of a rotating annular periodic structure comprises the steps of building a rigid-elastic coupling dynamic model of the rotating annular periodic structure according to a Hamilton principle under a global stationary coordinate system; introducing coordinate conversion, and converting the dynamic model to a support follow-up coordinate system so that a parametric item in an original equation is eliminated; performing discrete processing on a partial differential constant coefficient dynamic equation under the rotating support follow-up coordinate system by a Galerkin method to obtain an ordinary differential matrix equation; analyzing a characteristic value of the ordinary differential matrix equation by using a classical vibration theory; and respectively analyzing mode characteristic of the rotating annular periodic structure and a dynamic stability rule of parametric elastic vibration by employing an imaginary part and a real part of the characteristic value of the ordinary differential matrix equation. The parametric elastic vibration analysis method can be used for dynamic analysis of rotating machinery, calculation and solution of the mode characteristic of a system, and analysis on the dynamic stability and the dynamic response of the system.

The invention discloses a parallel implementation method and a parallel implementation device for a reed-solomon (RS) code. The method comprises the following steps of: determining a generating polynomial G(x) of an RS code according to parameters m, n and k, judging whether k and (n-k) can be exactly divided by H; selecting a corresponding parallel code implementation structure according to the condition whether (n-k) can be exactly divided by H; calculating a coefficient of a constant coefficient multiplier in the parallel code implementation structure according to the generating polynomial G(x); determining whether zero-fill or zero-suppression processing is required according to the condition whether k can be exactly divided by H; determining control of feedback door control signal, and input enabling and output selection signals in the parallel code implementation structure according to the parameters n, k and H; and outputting a parallel coding result. The parallel implementation method and the parallel implementation device are suitable for the parallel implementation of an arbitrary RS code pattern on a Galois Field (GF)(2m) under arbitrary parallelism degree H (H is not greater than k).

The invention belongs to the technical field of digital video signal coding, and particularly discloses a universal method applied to kinds of video standards for multi-size two-dimensional integer cosine transform. A plurality of different video coding standards can be supported by configuring a coefficient value of a constant coefficient multiplier, and simultaneously, the four transformation sizes of 4*4, 8*8, 16*16 and 32*32 are supported. By the method, two-dimensional discrete cosine transform is decomposed into twice one-dimensional discrete cosine transform; when the one-dimensional discrete cosine transform of four points is calculated, a computational load is reduced and computation speed is increased by adopting a conventional butterfly computation method; and an improved butterfly computation method is adopted for the one-dimensional discrete cosine transform of eight points, sixteen points and thirty-two points, so a relatively smaller one-dimensional discrete cosine transform unit can be multiplexed when the one-dimensional discrete cosine transform of a relatively larger size is computed, thereby greatly reducing the hardware resource overhead of the whole system.

A Reed-Solomon (RS) coding system is provided that can employ an RS code of varying correction power, and which can maintain a small area requirement. The Reed-Solomon coding system can include an RS encoder and an RS decoder. Both of these components can be implemented using primarily constant multipliers rather than more area-consuming general multipliers. For example, the programmable encoder can be realized by implementing polynomials with constant coefficients rather than variable coefficients, and a Berlekamp-Massey algorithm performed by the decoder can be realized using a serial implementation. To further reduce the area of the coding system, hardware sharing can be utilized between the RS encoder and the RS decoder.

The invention provides a design method for a noise-absorption metal fibrous porous material, the metal fibrous porous material and a preparation method thereof. According to the design method, the porosity and the fiber diameter of the metal fibrous porous material meet the following relational expression: phi<opt>=x1e<x2D>+x3e<x4D>, wherein, phi<opt> is the optimal porosity, D is the fiber diameter, x1, x2, x3 and x4 are constant coefficients and are changed with change of the thickness and the noise frequency of the metal fibrous porous material and obtained by calculating a plurality of data points through an optimization method. Under the condition that the noise frequency band and the fiber diameter are determined, the optimal porosity of the metal fibrous porous material with high-efficiency noise absorption performance can be obtained by the design method. The metal fibrous porous material obtained by the design method can meet the noise absorption requirement of the specific frequency band and can be widely applied to noise control in rail traffic, aerospace, automobiles, machining operation and experimental places.

The present invention relates to a method for automatically adjusting the screwing speed of a screwdriver in several successive steps. The method is characterized by comprising executing at least two continuous grades, wherein a preset point speed Vc is kept constantly in the period of each grade and is adjusted from one grade to the next grade. Furthermore the preset point speed is calculated for satisfying an equation: Vc=VMax*K1*K2, wherein K1 is a constant coefficient of the variation range of torque that varies along with time. Furthermore K2 is a constant coefficient which aims at the percentage range of the final torque. Furthermore each grade is predefined by an upper limit and a lower limit that are represented by the percentage form of the final torque. Furthermore the variation from one grade to the next grade causes value variation of the coefficient K2.

The invention relates to an automatic latitude measuring and calculating and automatic precision compensating method of a pendulum gyro north seeker. The method is characterized in that the geographic latitude is resolved by utilizing the pendulum period measured by an alidade of the pendulum gyro north seeker under a non-tracking state, and the directive coefficient is calculated, so that the precision compensation of deviation brought about by torsion zero deviating from true north is completed, and the method comprises the four steps of calibrating the relationship coefficient of the period and the latitude, starting a north seeking process, measuring the period under the non-tracking state, resolving the latitude by the non-tracking period, and correcting the torsion zero deviation automatically. Compared with the prior art, the automatic latitude measuring and calculating and automatic precision compensating method of the pendulum gyro north seeker has the advantages that in actual applications, the latitude is not required to be input before measurement, and the directive coefficient is also not required to be calibrated and calculated; through the constant coefficient relationship of the period and the latitude, which is calculated in advance in a calibrating site, the latitude at the site can be resolved only by measuring the non-tracking pendulum period of a measured site, and further a measurement result is corrected. The method can be widely applied to the fields of aviation, aerospace, geodetic measurement, guided missile aiming and the like.

The present invention provides a method for electrochemical polishing of a metal interconnection wafer structure. The method provided by the invention comprises: the step 1, performing electrochemical polishing of one part of wafers in a wafer production, and obtaining an average time T0 being required to polish a qualified wafer; the step 2, measuring the thickness front value D0 of any one wafer O in the wafer production, and comparing the thickness front value D0 with a front value target value D; the step 3, performing electrochemical polishing of the wafer O; the step 4, cleaning the wafer O; the step 5, measuring the thickness back value D1 of the wafer O; the step 6, determining whether the thickness back value D1 of the wafer O meets the requirement of a back value target value D' or not, and reworking the wafer O or putting into a CMP module. The time T (which is required for polishing the wafer O)=T0+[(D0-D)/(K*RR)]*60, wherein RR is polishing rate and K is a constant coefficient; the RR slows down with increasing the batch number of polishing wafers, and the K is determined by the feature of the wafer production. The method for electrochemical polishing of a metal interconnection wafer structure is easy to implement and obvious in effect, and is able to greatly improve the yield rate of high polishing wafer productions.

The invention discloses a simplified analysis method for an inherent frequency and the stability of a rotational symmetric structure. The method comprises the steps of establishing a complete dynamic differential equation of a system, a dynamic differential equation adopting a no-extension hypothesis, and a dynamic differential equation adopting an extension hypothesis: establishing the complete dynamic differential equation of the system; establishing the dynamic differential equation adopting the no-extension hypothesis; establishing the dynamic differential equation adopting the extension hypothesis; introducing coordinate conversion for converting the three dynamic differential equations to a support follow-up coordinate system so as to obtain corresponding three constant coefficient partial differential dynamic equations; performing discrete processing on the three constant coefficient partial differential dynamic equations in the support follow-up coordinate system to obtain three constant differential matrix equations; obtaining an eigenvalue of the complete dynamic differential equation and eigenvalues of two simplified dynamic differential equations; and analyzing a parametrically excited vibration mode characteristic and a dynamic stability change law of the rotational symmetric structure according to the three eigenvalues. According to the method, a specific analysis expression of system eigenvalues can be obtained more clearly.

The invention belongs to the technical field of an integrated circuit design, and particularly relates to a high-precision and low-power-consumption FFT processor. The FFT processor adopts a storage device interaction based framework, and comprises a butterfly computation unit, an address generator, a data storage device, a twiddle factor storage device and a zoom factor generator. The high-precision and low-power-consumption FFT processor adopts an improved block floating point technology and or gate based Trounding technology, a data path is equipped with a constant coefficient multiplying unit array and a common plural multiplying unit, and which module is used for multiplying operation is selected according to a data sequence number based determination mechanism. The FFT process has small error and high entire conversion accuracy, and can effectively reduce the power consumption of the multiplying operation; and the FFT processor can be excellently applied to an embedded type low-power-consumption system.

The invention relates to a guidance control method for a carrier rocket, which is characterized by comprising the following steps: binding standard values such as a standard speed module value v, guidance constant coefficients kuPhi(v) and kuPhi(v) corresponding to the standard speed module value v, and guidance amplification coefficients Kd<Phi> and Kd<Psi>, and the like; according to linear interpolation of two points, calculating the guidance constant coefficients k'uPhi(v) and k'uPsi'(v) of the current point; calculating the guidance weight function I(t) of the current point; further calculating the guidance quantity UPhi(v) and UPsi (v) of the current point, and carrying out amplitude limiting on Uphi(v) and UPsi (v) and then outputting to an attitude control system. By directly adopting rocket speed (or apparent velocity) for replacing the existing universal speed and taking flying time as independent variable, the guidance control method leads guidance calculation process not tobe influenced by each-class shutdown, separation and injection time deviation anymore and improves accuracy of guidance.

The invention provides a thermal analysis modeling method for data extraction, which comprises the following steps of: firstly, establishing a model in finite element software, and dividing grids; secondly, calculating coefficients changing with time changes on the basis of information of the finite element software; thirdly, extracting a constant coefficient matrix without changing with the timechanges on the basis of the finite element software; fourthly, configuring a solving environment; fifthly, setting initial conditions and boundary conditions; and sixthly, resolving the model. When the modeling method is adopted, the powerful modeling and grid-dividing functions of the finite element software can be utilized; the problem of difficulty in establishing a complex model and dividing the grids is solved; the workload of the finite element modeling can be reduced; and complex boundary conditions can be loaded conveniently and quickly.

The invention discloses a method for dynamically optimizing washout coefficient to bring the movement platform overload capacity into full play. A cost function is used for determining a washout module coefficient, and positions and gestures of six freedom degrees of the movement platform are generated after the implementation of real-time dynamic optimization. The variation of the overload, which is generated in the middle of the stroke of a mechanism is greater than the variation of the positions and gestures of the six freedom degrees, which is generated by a constant coefficient washout module, and in an attachment to the stroke end of the mechanism, the actually achieved positions and gestures of the six freedom degrees of the movement platform after the output of a previous command are taken into consideration so as to prevent the frequent brake in the neighborhood of the stroke end of the mechanism, so that the movement platform overload capacity is brought into full play and the aim of maximally developing the movement platform performance is achieved. The invention is used for improving the fidelity of dynamic simulation of a flight simulator and relates to the field of dynamic simulation of the six-freedom-degree movement system of the flight simulator.

The invention provides a feed source device and a microwave antenna, applicable to the field of antennae. The feed source device comprises a waveguide tube, a dielectric medium inserted at one end of the waveguide tube and an auxiliary reflecting surface nested on the internal surface of the dielectric medium. The feed source device also comprises a matching medium coating the periphery of the dielectric medium, and the dielectric constant and the thickness of the matching medium are respectively disclosed in the specifications, wherein epsilon r is the dielectric constant of the dielectric medium 20, a is a constant coefficient between 0.5 and 3.5, and lambda is the wavelength of electromagnetic waves in vacuum. Through the feed source device and the microwave antenna provided by the invention, the reflection of the external surface of the dielectric medium to the electromagnetic waves can be greatly reduced by means of the added matching medium, the deterioration of standing-wave ratio caused by waves reflected by the external surface of the dielectric medium is basically eliminated, and the limitation to the material selection of the dielectric medium is also lowered.