32 results about "Linear component" patented technology

The invention discloses a digital self-interference cancellation method based on transceiver nonlinear behavior modeling, and belongs to the technical field of electronic reconnaissance and interference. The digital self-interference cancellation method comprises the following steps of performing linear combination on memory components of a broadband signal, and generating cross terms with different phase structures by using a nonlinear effect so as to construct a Wiener model; establishing a multipath self-interference channel model; nonlinear modeling is carried out on linear components of interference signals received by a radio frequency front end at a receiver, and nonlinear component modeling is a linear model; for a nonlinear model constructed by a linear component in an interference signal received by a radio frequency front end, adopting dynamic reduction measurement to reduce the complexity of the model; parameter preliminary estimation is carried out by using the characteristics commonly represented by the intermediate variables, and parameter estimation is optimized by combining a two-step iterative algorithm; and reconstructing the transmitting signal in the digital domain according to a parameter estimation result to generate a reference signal, and realizing interference cancellation in the digital domain of the receiving end.

The invention discloses a method for solving a signal instantaneous phase standard deviation, and the method comprises the steps: solving an instantaneous phase of a non-weak signal segment through setting a reasonable amplitude judgment threshold, carrying out the unwinding of the non-weak instantaneous phase through setting a reasonable unwinding threshold, solving a linear coefficient through linear fitting, calculating a residual carrier frequency offset value, and correcting original IQ data. And finally, fitting the sequence again to obtain a linear component, subtracting the linear component from the nonlinear component instantaneous phase sequence again, performing secondary linear component removal on the nonlinear component instantaneous phase sequence, and calculating a standard deviation through a standard calculation formula to obtain a non-weak signal segment. And obtaining the standard deviation of the instantaneous phase. According to the method, the instantaneous phase linear component of the amplitude modulation signal can be completely removed, and meanwhile, compared with an existing scheme, the problem of excessive unwrapping can be effectively solved in terms of instantaneous phase removal linear components of phase modulation and frequency modulation signals.

The invention belongs to the technical field of aviation cable fault positioning, and particularly relates to a cable fault positioning method based on time-frequency domain analysis, which comprises the following steps: firstly, collecting a cable fault signal, adopting a GWO-VMD algorithm, taking a minimum sample entropy as a fitness function, and optimizing to find an optimal penalty factor and decomposition layer number, so as to obtain a fault positioning result; removing a high noise component obtained by VMD decomposition according to the current sample entropy, and obtaining a reflected signal after noise reduction; performing cross term suppression on the reflected signal after noise reduction by using smooth pseudo Wigner distribution to obtain discrete SPWVD; and performing blind area elimination on the discrete SPWVD based on a blind area elimination algorithm of hypothesis verification to obtain a fault distance. A grey wolf optimization algorithm is applied to a variational mode decomposition algorithm, and parameters of decomposition layers and penalty factors of the VMD are optimized, so that the problem of interference of noise on reflection signal extraction is solved; secondly, the smooth pseudo Wigner distribution is adopted to solve the problem of cross term interference among a plurality of linear components in the traditional WVD distribution, and the positioning precision is improved.

The invention discloses a curvature compensation band-gap reference circuit with a high power supply rejection ratio, which is characterized by comprising a pseudo power supply circuit, a starting circuit and a main body circuit, the pseudo power supply circuit is connected with the starting circuit, and the starting circuit is connected with the main body circuit; compared with a traditional band-gap reference circuit, the band-gap reference circuit has the advantages that the power supply rejection ratio of the band-gap reference voltage source is increased by using a pseudo power supply circuit technology, so that the reference voltage source can still keep stable when the power supply voltage changes; the influence of a linear component and a nonlinear component of a temperature coefficient in the circuit on the reference voltage is reduced through the main body circuit, so that the band-gap reference has a relatively low temperature drift coefficient in a wide temperature range, which is crucial for keeping the stability of the reference voltage; and on the premise of not increasing the scale of the circuit, the stability and reliability of the power supply can be effectively improved, and the overall performance of the power supply is improved.

The present disclosure relates to an S-box implementation method, device, electronic device and computer-readable storage medium, and relates to the technical field of cryptographic algorithms. The S-box implementation method includes: transforming the S-box in a finite field GF(2 8 ) to perform affine transformation on the input elements to obtain the first intermediate variable and the second intermediate variable; the first intermediate variable is transformed in the field GF(2 4 ) and perform a first multiplication and exponentiation operation on the first multiplication and exponentiation results, and obtain the result of the XOR operation; the result of the XOR operation is converted into the field GF(2 4 ) to obtain a third intermediate variable; perform a second multiplication operation on the second intermediate variable and the third intermediate variable over the field GF(2), and perform an exclusive-OR operation on the result of the second multiplication operation to obtain an output result of the S-box. The present disclosure can reduce the number of logic gates required for the linear component of the S-box, compress the depth of the logic gate circuit, and optimize the efficiency of hardware implementation.

The invention provides a linear component engineering quantity extraction method based on a BIM model, and belongs to the technical field of airport facility digital construction, and the method comprises the steps: decomposing a linear component into a plurality of surfaces, and obtaining a starting bottom edge of the linear component; identifying a bottom surface containing the starting bottom edge, and taking the bottom surface as a target object; identifying the relative bottom edge of the target object, and calculating the length of the target object; taking the opposite bottom edge as a new starting bottom edge, identifying a new bottom surface according to the adjacency relation with the new starting bottom edge, and taking the new bottom surface as a new target object; and extracting the sum of the lengths of all the bottom surfaces to calculate the linear component engineering quantity. The invention further provides a linear component engineering quantity extraction device based on the BIM model, electronic equipment and a storage medium. By adopting the technical scheme of the invention, the technical problems of large calculation error and low efficiency of the engineering quantity calculation of the linear component in the prior art can be solved.

The invention relates to the technical field of circuit structure design of radio frequency amplifiers in the field of wireless communication, and in particular to an adaptive bias circuit of a millimeter wave amplifier for improving linearity. Adaptive bias is achieved by setting a feedback module to offset gain reduction under high power. Input impedance is optimized by a coupling module, linear components are reduced, and a third-order intermodulation intercept point is improved. While achieving bias adaptation and ensuring high power gain, saturated output power and efficiency, amplifier linearity is improved by constructing a coupling path to overcome the contradiction between efficiency and linearity. When input power increases, a feedback signal is received by a feedback module to gradually increase an output bias voltage and keep the gain from decreasing. When input power continues to increase, the series-parallel structure of diodes further enhances the bias voltage increase trend and increases the saturated output power.

The invention discloses an intelligent frequency agility method and system based on frequency spectrum cognition and deep learning, and the method comprises the steps: generating a plurality of baseband linear frequency modulation signals with different center frequencies, and obtaining a broadband radio frequency linear frequency modulation signal set; inputting the signals into a digital phased array receiving channel at the same time to obtain a multi-path baseband data set; according to the real-time total delay of the receiving channel, performing integral multiple clock period delay on each signal data in the baseband data set to obtain a delay linear frequency modulation signal set; according to the multi-path baseband data set and the delay linear frequency modulation signal set, determining a peak position of each datum in the correlation peak data set through a peak search algorithm model, and further calculating a phase difference set; and removing a first-order linear component and a direct-current component in the phase difference set by adopting a dechirp algorithm to obtain a phase nonlinear set of the digital phased array receiving channel. According to the invention, nonlinear, efficient, accurate and low-cost measurement of the phase of the digital phased array receiving channel can be realized.

Circuitry for determining an impedance of an electrochemical cell comprising at least one first electrode and a second electrode, the circuitry comprising: drive circuitry configured to apply a stimulus to the electrochemical cell, the stimulus having a stimulation frequency and a stimulation amplitude; and measurement circuitry configured to: measure an output of the electrochemical cell to generate an output signal; separate the output signal into a linear component and a non-linear component; and determine the impedance of the cell based on the linear component of the response.

Amplifier circuit (100), comprising: a differential input stage (102) configured to receive a differential input signal, wherein the differential input stage (102) is susceptible to an offset error having a linear offset error component and a nonlinear offset error component; and an offset error correction circuit (406) coupled to the differential input stage (102) and configured to apply a second-order error correction signal to the differential input stage (102) in order to correct the non-linear component of the offset error wherein the offset error correction circuit (406) comprises a reference current circuit (608) configured to generate a current signal with a second-order dependence on temperature as the second-order error correction signal and to adjust the magnitude and polarity of the current signal according to the non-linear component of the offset error, and wherein the reference current circuit (608) is configured to generate the current signal using a voltage differential signal with a temperature-dependent second-order voltage signal component.

The invention discloses a method, a device and equipment for measuring the phase nonlinearity of a digital phased array receiving channel, and the method comprises the steps: generating a plurality of baseband linear frequency modulation signals with different center frequencies, and obtaining a broadband radio frequency linear frequency modulation signal set; inputting the signals into a digital phased array receiving channel at the same time to obtain a multi-path baseband data set; according to the real-time total delay of the receiving channel, performing integral multiple clock period delay on each signal data in the baseband data set to obtain a delay linear frequency modulation signal set; according to the multi-path baseband data set and the delay linear frequency modulation signal set, determining a peak position of each datum in the correlation peak data set through a peak search algorithm model, and further calculating a phase difference set; and removing a first-order linear component and a direct-current component in the phase difference set by adopting a dechirp algorithm to obtain a phase nonlinear set of the digital phased array receiving channel. According to the invention, nonlinear, efficient, accurate and low-cost measurement of the phase of the digital phased array receiving channel can be realized.

The embodiment of the invention discloses an amplification circuit and electronic equipment, and the amplification circuit comprises an input matching unit which is used for matching impedance between an input end of a gain unit and a signal source, and the input matching unit is provided with a signal receiving end and a first output end. The correction unit is used for generating a compensation signal, and the compensation signal comprises a non-linear component. The gain unit receives the impedance-matched first signal output by the input matching unit and performs transconductance amplification on the first signal to generate a second signal; the compensation signal is received, the compensation signal and the second signal are superposed and then are further amplified to generate and output a third signal, and the compensation signal and the second signal are opposite in electrical property. And the output matching unit is used for matching impedance between the output end of the gain unit and the load so as to perform impedance matching processing on the received third signal and output the third signal subjected to the impedance matching processing.

1. Name of the product in this design: Precision Linear Component. 2. Application of this design: This design is a precision linear component that allows the inner component to move relative to the outer guide rail. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1. 5. The fine lines shown in “Reference Figure 1” to “Reference Figure 5” are all ridge lines used to define the shape of the three-dimensional surface.

The present disclosure refers to a rotation device, particularly a flow producing device, as well as methods that are configured to determine a condition of a bearing arrangement of rotation device. The bearing arrangement bears a rotor of an electric motor and / or a rotor arrangement including the rotor rotatingly around a rotating axis. At least one rotation parameter is determined that describes the rotation around the rotation axis, as well as at least one power parameter that describes the power of the electric motor. The determination of the at least one rotation parameter and the at least one power parameter is carried out to a current observation point in time, particularly at least at one observation point in time during a determination time phase. The at least one rotation parameter and the at least one power parameter are evaluated in relation to one another and therefrom a condition parameter is determined describing the condition of bearing arrangement. Particularly for this purpose a linear component of a power-rotation-correlation between the at least one current rotation parameter and the at least one current power parameter is used.

The utility model relates to the technical field of radio frequency front ends, in particular to a high-linearity HBT (Heterojunction Bipolar Transistor) power amplification circuit with temperature compensation. According to the circuit, the linear improvement is realized through the synergistic effect of the bias module and the pre-distortion module, and the high linearity of the circuit is realized through the anti-phase offset of the nonlinear component phases of the two modules; the temperature compensation unit is arranged on the bias module, so that high linearity can be realized in a relatively large working range.

The invention relates to a rotating device 10, in particular a flow-generating device 11, and to a method V1, V2, which is designed to detect a state of a bearing arrangement 18 of the rotating device 10. The bearing arrangement 18 rotatably supports a rotor 16 of the electric motor 14 and / or a rotor arrangement 17 having a rotor about a rotational axis A. At least one rotational movement parameter describing the rotational movement about the rotational axis A and at least one power parameter describing the power of the electric motor 14 are determined. At least one rotational motion parameter D and at least one power parameter P are detected at a current observation time, in particular at at least one observation time in the detection time period [Delta] t. The at least one rotational motion parameter D and the at least one power parameter P are evaluated in relation to each other and a state parameter B describing a state of the bearing assembly 18 is determined therefrom. In particular, a linear component of a power-rotational motion correlation KA between at least one current rotational motion parameter D and at least one current power parameter P is used for this purpose.

The invention discloses a memristor monostable trigger circuit, and relates to the technical field of circuit design, and the memristor monostable trigger circuit comprises a first resistor R1, a second resistor R2, a first transistor T1, a second transistor T2, a first memristor M1, a second memristor M2, a first signal source V1, a second signal source V2 and a third signal source V3. A traditional RC module is replaced by cooperative control of the double memristors, the pulse width is dynamically adjusted by directly utilizing the charge memory characteristic of the memristors, the design enables the output pulse width to be adaptive to input signal changes, meanwhile, pulse width distortion caused by capacitor electric leakage is eliminated, the dependence of a traditional circuit on linear elements is broken through, and the reliability of the circuit is improved. And thus, a more efficient solution is provided for intelligent sequential control.

Circuitry for determining an impedance of an electrochemical cell comprising at least one first electrode and a second electrode, the circuitry comprising: drive circuitry configured to apply a stimulus to the electrochemical cell, the stimulus having a stimulation frequency and a stimulation amplitude; and measurement circuitry configured to: measure an output of the electrochemical cell to generate an output signal; separate the output signal into a linear component and a non-linear component; and determine the impedance of the cell based on the linear component of the response.

The application discloses a power system power shortage estimation method and device, terminal equipment and a storage medium. The method comprises the following steps: constructing a local frequency variation model of a generator in a power system; sampling the local frequency of the generator in the power system to obtain a local frequency variation time sequence; extracting the coefficient of a linear component of the local frequency variation according to the local frequency variation model and the local frequency variation time sequence through least square fitting; and calculating a power system power shortage estimation value according to the coefficient of the linear component of the local frequency variation and the total inertia of the power system. The application can quickly estimate the power system power shortage without real-time communication.

The invention discloses a Conv-BiLSTM and LS-based simultaneous same-frequency full-duplex digital domain adaptive self-interference elimination method and system, and relates to a self-interference signal elimination technology in the field of communication. The invention aims to provide a same-time same-frequency full-duplex digital field adaptive self-interference elimination method for determining the length of a self-interference channel based on a Bayesian optimization algorithm and combining Conv-BiLSTM and LS so as to solve the problems in the background technology. The method comprises the following steps: estimating the length of a self-interference channel by using a Bayesian optimization algorithm, and carrying out self-interference linear cancellation on a self-interference signal by using LS according to determined parameters; the method comprises the following steps: constructing a Conv-BiLSTM network, then training by using the constructed Conv-BiLSTM network to fit a self-interference nonlinear component, and compared with an FFNN, the constructed Conv-BiLSTM network can process a high-dimensional time sequence signal more effectively and has a good effect on prediction of a non-linear distortion signal with memorability; and finally, subtracting the reconstructed self-interference signal from the received signal at a receiving end to achieve the purpose of self-interference cancellation.

The invention provides a missile-borne bistatic forward-looking SAR time-frequency synchronization method based on direct waves, and the method comprises the steps: carrying out the data demodulation of a received direct wave signal, and carrying out the distance compression of the demodulated direct wave signal; extracting a peak signal with the maximum amplitude of each sampling pulse in the direct wave matrix after distance compression to form a peak signal vector, and performing Doppler centroid estimation on the peak signal vector; performing polynomial fitting on peak position historical data corresponding to peak signals in each sampling pulse, extracting linear components, eliminating deviations corresponding to Doppler centroids, obtaining an offset rate of a linear time synchronization error, and compensating the linear time synchronization error according to the offset rate; the peak phase of the peak signal is subtracted, deviation corresponding to the Doppler centroid is eliminated, an estimated value of the fixed frequency synchronization error is obtained, and the fixed frequency synchronization error is compensated according to the estimated value. According to the method, the time-frequency synchronization error between missile-borne double-base foresight SAR platforms can be effectively eliminated, and high-quality imaging in the whole guidance process is guaranteed.

This signal-processing device comprises: a transmission control unit (141) that transmits a control signal for causing a transmission unit (11) to transmit a plurality of transmission signals having different characteristics; a reception signal acquisition unit (142) that acquires a plurality of reception signals from a reception sensor (13); a non-linear component extraction unit (143) that extracts a non-linear component by performing calculation according to the characteristics of the transmission signals transmitted by the transmission unit (11), on the basis of the plurality of reception signals acquired by the reception signal acquisition unit (142); and a property estimation unit (144) that estimates a property of a measurement target (2) on the basis of the non-linear component extracted by the non-linear component extraction unit (143). The plurality of transmission signals each have an amplitude that allows a plurality of transmission pulses to exhibit non-linear effects in air. The plurality of reception signals include low-frequency components generated by the non-linear effects in air.

A frequency modulation continuous wave (FMCW)-based system configured to convert measurements of a linearly modulated wave from a time-domain into a frequency-domain to produce a non-linear frequency signal, where the non-linear frequency signal comprises a known linear component representing the desired linear modulation and an unknown non-linear component representing the non-linearity of the modulation. The FMCW-based system is further configured to determine coefficients of a basis function approximating a difference between the non-linear frequency signal and the linear frequency component in the frequency domain. The FMCW-based system is further configured to detect one or multiple spectrum peaks in the distorted beat signal with the distortion compensated according to the basis function with the determined coefficients to determine one or multiple distances to the one or multiple objects in the scene.

The invention relates to the technical field of motor control, in particular to a model prediction control method based on a hybrid nonlinear Hammerstein model, which comprises the following steps of: sampling three-phase current of a motor, constructing the hybrid nonlinear Hammerstein model, calculating d-axis and q-axis linear component stator current at a k + 1 moment through an external input autoregression model, and calculating a k + 1 moment. D-axis and q-axis non-linear component stator currents at the k + 1 moment are selected through the midline table and the non-linear component table, a first control equation is constructed, a modulation signal is obtained, and the modulation signal is converted into a pulse control signal through a modulation module and controls a motor driver. According to the method, the hybrid nonlinear Hammerstein model is introduced to be applied to the permanent magnet synchronous motor driving system, and nonlinear motion component factors of the motor system are brought into a model prediction process, so that linear and nonlinear motion of the motor system are considered, the motion state of the motor system can be accurately represented, and the description precision is relatively good.

The application relates to the technical field of motor control, in particular to a model predictive control method based on a hybrid nonlinear Hammerstein model, which comprises the following steps: sampling three-phase currents of a motor, constructing a hybrid nonlinear Hammerstein model, calculating linear component stator currents of d-axis and q-axis at k+1 time through an external input autoregressive model, selecting nonlinear component stator currents of d-axis and q-axis at k+1 time through a neutral line table and a nonlinear component table, constructing a first control equation, obtaining a modulation signal, and converting the modulation signal into a pulse control signal through a modulation module and controlling a motor driver. The application introduces the hybrid nonlinear Hammerstein model into a permanent magnet synchronous motor driving system, and puts nonlinear motion component factors of the motor system into a model prediction process, so that linear and nonlinear motions of the motor system are considered, the motor system motion state can be accurately characterized, and the description precision is good.

A multilevel linear amplifier with non-linear components, MLINC (1), for a radio frequency transmitter, the MLINC (1) comprising a first outphasing amplifier (2) adapted to receive a first set of input signals (S11, S12) and providing a first intermediate signal (S1) with a stepped envelope depending on a controlled portion (θc1) of a phase modulation in the first set of input signals (S11, S12); a second outphasing amplifier (3) adapted to receive a second set of input signals (S21, S22) and to provide a second intermediate signal (S2) with a stepped envelope depending on a controlled portion (0c2) of a phase modulation in the second set of input signals (S21, S22); and a combiner (6) adapted to combine the first and second intermediate signals (S2) into an output signal (Sout) having an envelope linearized due to a phase symmetry of the first and second intermediate signals (S1, S2).

The invention relates to a rotary device (10), in particular a flow-generating device (11), and a method (V1, V2) configured to determine the state of a bearing arrangement (18) of the rotary device (10). The bearing arrangement (18) rotatably supports a rotor (16) of an electric motor (14) and / or a rotor arrangement (17) comprising the rotor about an axis of rotation (A). At least one rotational motion parameter describing the rotation about the axis of rotation (A) and at least one power parameter describing the power of the electric motor (14) are determined. The determination of the at least one rotational motion parameter (D) and the at least one power parameter (P) is carried out at a current observation point, in particular at at least one observation point within an observation period (Δt).The at least one rotational motion parameter (D) and the at least one power parameter (P) are evaluated in relation to each other, and a state parameter (B) is determined from this, which describes the state of the bearing arrangement (18). In particular, a linear component of a power-rotational motion correlation (KA) between the at least one current rotational motion parameter (D) and the at least one current power parameter (P) is used for this purpose.