65 results about "Multi rate" patented technology

The invention discloses a high-frequency motor drive multi-rate control method for time sequence disturbance compensation, and the core principle of the method is that low-rate disturbance compensation and a reference tracking trajectory are improved and converted into a time sequence processing process matched with a high-rate control instruction; specifically, a single disturbance compensation value which can be known only at a sampling moment Ts is expanded into time sequence prediction of disturbance changes on N control points in the future through a generalized proportional-integral observer; meanwhile, a low-frequency single reference instruction is constructed into a smooth high-frequency reference trajectory covering N control points through a Lagrange interpolation method, and closed-loop correction of disturbance compensation and reference tracking is achieved on each high-frequency control point Tc. The problem that open-loop prediction errors are continuously accumulated and spread due to mismatching of information updating rates in traditional multi-rate control is fundamentally solved, and therefore high-precision robust control over the high-frequency motor driving system is achieved.

The invention provides a soft measurement method and device for industrial multi-rate acquisition and a medium, and the method comprises the steps: collecting historical data in an industrial process, and dividing the historical data into a plurality of pieces of sampling rate data; feature extraction is carried out on different sampling rate data, and dimension regularization is carried out to obtain each scale feature; according to each scale feature and the query source, obtaining each bidirectional cross attention matrix, and performing fusion to obtain a bidirectional cross attention feature; dynamically calibrating the bidirectional cross attention features based on historical features to obtain a soft measurement model; and inputting to-be-predicted data in the industrial process into the soft measurement model to obtain a quality variable prediction result in the industrial process. According to the method, the device and the medium, the problem of low industrial process quality variable prediction accuracy caused by insufficient feature extraction, insufficient cross-scale association mining and limited utilization of historical target trend information when a soft measurement method of an existing industrial system processes multi-sampling-rate data can be solved.

The invention relates to the technical field of data transmission, in particular to a CAN communication network multi-rate adaptive transmission control system, a control method and a vehicle electronic control system. According to the CAN communication network multi-rate adaptive transmission control system, dynamic rate adjustment and intelligent load balancing are realized through four core modules: a data classification module divides data into a security class, a power class, a comfort class and an entertainment class, and calculates a dynamic weight; the network state monitoring module adopts a sliding window algorithm to calculate a network load rate in real time; the rate decision module dynamically selects the transmission rate according to the priority and the load rate; and the multi-path control module selects an optimal standby path based on the comprehensive score of the path load rate, the hop count and the link quality, and distributes traffic through a weighted polling algorithm. The system breaks through the limitation of a traditional CAN fixed rate, realizes low-delay transmission of high-priority data and efficient utilization of network resources, and is particularly suitable for a high-load communication scene of an intelligent automobile.

The invention relates to a multi-rate wireless frame adaptive architecture method and device, equipment and a storage medium, and the method comprises the steps: receiving channel state information, and determining pilot frequency configuration according to the channel state information; receiving service data to be transmitted, selecting a corresponding modulation mode based on the channel state information, and performing symbol modulation on the service data according to the modulation mode to obtain a service modulation symbol; carrying out frequency hopping distribution on the service modulation symbols based on the pilot frequency configuration, and carrying out frequency hopping transmission on the service modulation symbols according to the frequency hopping distribution; and receiving the frequency hopping data after the frequency hopping transmission, and performing data recovery on the frequency hopping data to obtain decoded service data. The method and the device have the effect of improving the adaptability of the multi-rate architecture.

The invention discloses a time synchronization method in a multi-rate OFDM (Orthogonal Frequency Division Multiplexing) communication system. The time synchronization method comprises the following steps: S1, forming a training symbol based on a ZC sequence; s2, quantifying the matching degree of a received signal and a synchronous signal in the multi-rate OFDM communication system; s3, performing sliding window energy normalization on the received signal to generate a dynamic detection threshold value; and S4, when the matching degree of the received signal and the synchronization signal is greater than a dynamic detection threshold, detecting the peak position of the synchronization signal, and outputting a timing estimation position to realize time synchronization. According to the method, a ZC sequence synchronization mechanism is expanded to a dynamic bandwidth scene for the first time, the synchronization problem under a complex channel in unmanned aerial vehicle communication is solved through unique characteristics of the ZC sequence, the technical blank of high-maneuverability unmanned aerial vehicle communication is filled, and efficient and high-precision time synchronization is achieved.

A method for adaptively estimating distortion coefficients of a power amplifier for compensating distortion of the power amplifier, the method has the steps of: estimating the power-amplifier distortion coefficients based on a first digital signal for generating a radio-frequency analog signal through the power amplifier, and a second digital signal obtained from the radio-frequency analog signal. The first digital signal has a length adaptively variable based on a predefined distortion-estimation accuracy.

A system for activating multi-rate optical network units (ONUs) includes an optical network having an optical line terminal (OLT) optically coupled to a plurality of ONUs, including one or more multi-rate ONUs configured to support multiple upstream rates. During discovery when other ONUs are permitted to transmit in the same quiet window, a multi-rate ONU that supports a higher rate is instead configured to send a discovery response at a sufficiently low rate so as not to require training of an equalizer, thereby allowing for a short preamble for the discovery response. Thereafter, during a quiet window for ranging when only the multi-rate ONU will be transmitting to prevent data collisions, the multi-rate ONU is transitioned to a higher rate and transmits a message with a sufficiently long preamble to train an equalizer at the OLT.

This disclosure provides methods, components, devices and systems for multirate audio mixing. Some aspects more specifically relate to mixing audio streams with different sample rates. In some examples, an audio source device may convert audio streams with different sample rates to the frequency domain using a modified discrete cosine transform (MDCT), and the audio source device may mix the audio streams with different sample rates in the frequency domain. The audio source device may apply a pre-emphasis filter after mixing the audio streams in the frequency domain. An audio stream with a higher sample rate may be down-sampled by dropping frequency bins after converting the audio stream to the frequency domain. Additionally, or alternatively, an audio stream with a lower sample rate may be up-sampled by padding frequency bins of the frequency domain-converted audio stream.

The application provides a kind of multi-rate adaptive compatible coherent demodulation method and device, belong to coherent demodulation technical field;The method comprises: the pre-treatment of coherent light signal;Adopt the double-stage mechanism of coarse identification and fine identification combination to automatically identify the rate and modulation format of signal, wherein fine identification utilizes lightweight CNN classifier;According to the recognition result, adaptively configure the core demodulation parameters such as sampling rate, equalizer order, operation bit width and carrier recovery algorithm;Through the unified configurable modular architecture, complete synchronization, equalization, carrier recovery and other demodulation processing;Soft decision is made to demodulated signal and real-time monitoring performance index;According to the monitoring result, closed-loop dynamic fine tuning is carried out on demodulation parameter;The application realizes the automatic identification and compatible demodulation of 100G / 200G / 400G and PM-QPSK / PM-16QAM signal, and is suitable for general coherent acquisition platform, intelligent optical network receiver and multi-rate optical communication tester.

An apparatus may include a transmitter. The apparatus may identify a target code rate and a low density parity check (LDPC) code that has a base code rate for a base size of information bits, select, based at least on the target data rate and the base code rate, a first size that is less than the base size of information bits, generate a second set of information bits to include a first set of information bits corresponding to the first size and one or more bits to increase a size of the second set of information to correspond to the base size of information bits, encode, using the base code rate, the second set of information bits to generate parity data, and generate a codeword by concatenating the first set of information bits and the parity data to achieve the target code rate. The transmitter may transmit the codeword.

The invention discloses a multi-rate asynchronous sampling control method for a driving motor of a deep-sea robot. The method comprises the following steps: configuring basic electrical and mechanical parameters of a motor system with a plurality of independent partitions; constructing a parameter matrix and realizing control signal decoupling through structural decomposition; setting a basic sampling period and configuring a differential sampling period which is integral multiple of the basic sampling period for each partition to complete control signal discretization; constructing a selection matrix to determine a control signal sequence under multi-rate sampling; discretizing the parameter matrix and solving a feedback control gain matrix; constructing an autonomous system to describe a rotating speed tracking signal and solving a feed-forward control gain matrix; finally, discrete control voltage is calculated according to a multi-rate period based on the armature current detected in real time, and the motor is driven. Through a multi-rate asynchronous sampling strategy, dynamic characteristics and control requirements of different partitions are effectively matched, and the motor control efficiency and response performance in a deep sea environment are remarkably improved.

A method and procedure for manufacturing a disk device capable of improving head positioning accuracy in a disk device controlled by multi-rate actuators using two-stage actuators are provided. In this embodiment, before applying an additional MA filter, a test signal is applied at 1 / N cycles to measure the head position error spectrum and frequency characteristics for both the VCM and MA operation values. Based on the frequency characteristics, a multi-rate sensitivity characteristic is calculated, and the frequency to be corrected by the MA filter is determined based on the head position error spectrum and the multi-rate sensitivity characteristic. Furthermore, with each candidate of a plurality of MA filter candidates applied, a test signal is applied at 1 / N cycles to measure the frequency characteristics for both the VCM and MA operation values. Based on the frequency characteristics, a multi-rate sensitivity characteristic is calculated, and the candidate with the lowest head position error and a peak value of the multi-rate sensitivity characteristic below a threshold is selected as the MA filter to be used.

The invention provides a method for predicting the industrial residual service life based on multi-rate data, and the method comprises the steps: training a prediction model, and inputting the data of a test target domain into the prediction model to obtain the prediction output, and the process of training the prediction model comprises the steps: obtaining a source domain data sample, preprocessing the source domain data sample to obtain a source data matrix sample; performing position code embedding processing on the source data matrix sample to obtain a code matrix after position code embedding; and inputting the coding matrix into a Mamba model to obtain a prediction model. According to the method, firstly, the input sequence X in a source domain data sample and the corresponding timestamp t are obtained, missing data are processed through linear interpolation and forward / backward filling, and data continuity and integrity are ensured. Afterwards, the complemented data is connected with the residual error through a multi-layer convolutional network to ensure that the original value is not interfered, and fine-grained complementation is carried out through an encoder to optimize the data precision.

The invention provides a multi-rate network intelligent route planning method based on minimum media occupancy time, and belongs to the field of multi-rate networks and route planning. According to the method, firstly, an ant colony algorithm is adopted, the mobility of nodes is introduced, a stable and optimal MPR set is selected, and whole network topology information is obtained; then giving a network link weight based on media occupancy time; and finally, selecting an optimal route based on a simulated annealing algorithm of multi-agent optimization. According to the method, the traditional method of selecting the routing based on the minimum hop count is abandoned, the media occupation time is defined to comprehensively evaluate the network link weight, the time delay of the network is reduced, and the throughput of the network is increased; and secondly, routing is selected by adopting a simulated annealing algorithm based on multi-agent optimization, so that the optimization capacity is improved, the network dynamics is adapted, and the robustness of the network is enhanced.

This application discloses an LVDS adaptive frame synchronization system, comprising: a transmitting end: a clock generation module providing multi-rate clocks; a data parallel-to-serial conversion module converting parallel data into a high-speed serial bit stream under clock control; a multi-functional auxiliary channel parallel-to-serial conversion module interleaving and encoding auxiliary control information and synchronization information into a composite bit stream; and an LVDS driver group converting signals into differential signals for transmission. The receiving end: an LVDS receiver group converts differential signals into single-ended signals, including multiple data signals, one auxiliary channel signal, and one half-rate clock signal. A serial-to-parallel conversion and synchronization control module uses a half-rate clock to perform DDR sampling of the data and auxiliary channel signals. Synchronization information is extracted by sampling on the falling edge of the auxiliary channel signal, and auxiliary control information is extracted by sampling on the rising edge. A synchronization detection unit obtains the capture sequence from the synchronization information, and a numerically controlled delay unit calculates the delay correction amount based on the mapping relationship between the capture sequence and the correction signal to delay the data, thereby achieving adaptive frame synchronization.

The application provides a multi-rate switching error code testing device and a working method thereof. The error code testing device comprises a control terminal, a control module, a signal generating unit and a signal receiving unit. The control terminal is used for receiving a multi-rate switching test configuration command of a user, encapsulating the multi-rate switching test configuration command as a control command and issuing the control command to the control module. The control module is used for receiving the control command issued by the control terminal, scheduling the signal generating unit and the signal receiving unit to execute an operation corresponding to the control command. The signal generating unit is used for preloading a test signal pattern parameter matched with a current target rate from a multi-rate parameter library according to the control command, generating a test signal according to the test signal pattern parameter and sending the test signal to a device under test. The signal receiving unit is used for receiving an output signal output by the device under test according to the test signal, and performing error code statistics on the output signal. The error code testing device can improve test efficiency.

An adaptable, multistage, multi-rate digital predistortion system that can increase the accuracy of the distortion applied to a power amplifier input signal is disclosed. Further, the digital predistortion system can be implemented using a reduced circuit area by reducing a number of coefficients used by the models applied to generate the distortion compensation signal. Further, the system can implement an improved digital predistortion adaptation engine that improves an adjacent channel leakage ratio of the digital predistortion system. Moreover, the system can compensate for non-linear impairments due to analog / RF circuits and systems and improve at least the following metrics: Error vector magnitude (EVM), adjacent channel leakage ratio (ACLR), spectrum emission mask (SEM), and power consumption of the circuits and systems. An example of circuits and systems is radio frequency power amplifier (RF PA).

The present invention belongs to the technical field of communication signal detection, and discloses a method for quickly capturing multi-rate communication signals under low signal-to-noise ratio, mainly solving problems such as slow signal detection speed, single method for selecting statistics, and decreased capture ability in a low signal-to-noise ratio environment when performing time-domain serial capture on signals with different code rates. The implementation steps are as follows: (1) pre-group the possible range of the signal code rate; (2) sample and quantize the received signal; (3) calculate the zero-delay slice of the cyclic correlation of the received signal to estimate the carrier frequency of the signal; (4) intercept the processed signal, slide and select multiple delay slices for accumulation, construct a statistic adapted to the change of the code rate, and perform a rough estimation of the signal code rate; (5) according to the rough estimation result of the code rate, select the best slice of the cyclic correlation to obtain the accurate value of the code rate. The present invention has the advantages of high flexibility and real-time performance, fast capture speed, high capture accuracy, etc., can quickly capture signals in a low signal-to-noise ratio complex electromagnetic environment, and is beneficial to the establishment of a fast communication link.

The present invention discloses a multi-rate asynchronous sampling control method for a deep-sea robot's drive motor. The method includes the following steps: configuring the basic electrical and mechanical parameters of a motor system with multiple independent partitions; constructing a parameter matrix and achieving control signal decoupling through structural decomposition; setting a base sampling period and configuring differentiated sampling periods that are integer multiples of the base sampling period for each partition to discretize the control signal; constructing a selection matrix to determine the control signal sequence under multi-rate sampling; discretizing the parameter matrix and solving the feedback control gain matrix; constructing an autonomous system to describe the speed tracking signal and solving the feedforward control gain matrix; and finally, calculating discrete control voltages based on the real-time detected armature current according to the multi-rate period to drive the motor. This multi-rate asynchronous sampling strategy effectively matches the dynamic characteristics of different partitions with the control requirements, significantly improving motor control efficiency and responsiveness in deep-sea environments.

Embodiments of the present disclosure relate to a multi-rate low density parity check (LDPC) code. An apparatus may include a transmitter. The apparatus may identify a target code rate and a low density parity check (LDPC) code having a base code rate for a base size of an information bit, select a first size of the information bit less than the base size of the information bit based at least on the target data rate and the base code rate, generating a second set of information bits to include a first set of information bits corresponding to the first size and one or more bits to increase a size of the second set of information to the base size corresponding to information bits, encoding the second set of information bits using the base code rate to generate parity data, and generating a codeword by concatenating the first set of information bits and the parity data to achieve the target code rate. The transmitter may transmit the codeword.

The invention discloses a self-adaptive multi-rate gear air-to-air communication method, which comprises the following steps of: respectively installing a host and a responder of a microwave radar on an active aircraft and a target aircraft, and performing data interaction between the active aircraft and the target aircraft by the host and the responder through air-to-air communication in a rendezvous and docking process of the active aircraft and the target aircraft; the host and the responder transmit and receive according to an inter-satellite communication measurement integrated frame, the host or the responder for transmitting air-to-air communication is called as a transmitting end, the host or the responder for receiving air-to-air communication is called as a receiving end, a QPSK modulation scheme is adopted, and an I path serves as a measurement branch and is used for measuring data and transmitting low-rate communication data; and the Q path is used as a communication branch and is used for transmitting communication data at different high-speed gears. According to the invention, measurement and communication integration is realized on the basis of high-precision measurement, and the problem of multi-path tracking under multi-rate communication is solved.

The present invention discloses a multi-rate process fault detection method based on a Total Auto-regressive Dynamic Latent Variable Model. The multi-rate data samples of the process are collected online. The method utilizes a Total Multi-rate Auto-regressive Dynamic Latent Variable Model (TMrARDLV) to obtain the dynamic T2 statistics of the current moment test samples, static T2 statistics for each sampling rate, and SPE statistics. These statistics are then compared with the pre-established detection control limits to determine the online detection results of the process. This method fully utilizes comprehensive multi-rate data information from the process. It also considers the dynamic and static characteristics of the data separately by employing Kalman filtering and Bayesian methods. Moreover, it achieves accurate estimation of dynamic and static latent variables. The dynamic and static latent variables obtained through dimensionality reduction respond to faults in different data subspaces. This method enhances the accuracy and applicability of fault detection.

The invention provides a multi-rate asynchronous fusion photoelectric tracking and laser radar constraint correction recapture device and method, which are suitable for photoelectric detection and stable tracking of a maneuvering target. The recapture device comprises a photoelectric tracking subsystem, a laser radar subsystem, a timestamp and synchronization module, an asynchronous fusion processing module, a state machine, a scanning control module, a pointing control module and a pointing execution mechanism. According to the recapture method, time sequence inconsistency caused by low-frequency ranging delay is eliminated through multi-rate asynchronous fusion and timestamp delay compensation, the tracking stability and recapture efficiency in a sheltered or lost scene can be improved, and the method is used for solving the problem that a photoelectric tracking system is difficult to realize stable tracking in complex environments such as backlighting and weak textures at night. And the technical problem of how to quickly recapture the target in a short-time shielding / quick maneuvering or view field edge access scene of the target is solved.

The invention discloses a self-adaptive capturing method for a multi-rate direct sequence spread spectrum signal of a low earth orbit satellite, and belongs to the field of low earth orbit satellite communication. According to the method, the multi-rate direct sequence spread spectrum signal self-adaptive capturing method is constructed, multiple sets of direct sequence spread spectrum signal receivers at all rates do not need to be achieved, signal detection and synchronization can be conducted on the multi-rate direct sequence spread spectrum signals only through one set of receiver algorithm, and hardware resource consumption of the receivers is reduced; meanwhile, the capturing method is compatible with processing of multi-rate direct sequence spread spectrum signals, so that risks caused by program reconstruction and interruption of communication services can be avoided; in addition, under the condition that the transmitting power is not changed, the ground terminal adjusts the transmitting rate, on one hand, the transmitting rate can be increased, and the signal exposure time can be shortened; on the other hand, the transmission rate can be reduced to ensure the communication reliability, and the communication is more flexible; according to the invention, on the basis of a DSSS receiver algorithm, signal detection and synchronization of spread spectrum signals with different rates are completed through a self-adaptive adjustment capturing method.

The invention relates to the technical field of material mechanical property testing, in particular to a multi-rate tensile test method based on speed correction and self-adaptive adjustment. The method comprises the following steps: firstly, determining a theoretical tensile speed according to collision regulations, and obtaining a real strain rate of a material through a primary test; and correcting the theoretical speed in combination with the scale distance of the sample. Starting from the corrected speed, by comparing the change of the maximum stress of the material at the adjacent rates, adaptively selecting different proportions to adjust the subsequent test speed step by step, and iteratively carrying out until a preset span ratio termination condition is met. Through speed planning and feedback adjustment of the system, an effective stress-strain curve which covers a wide strain rate range and is free of data redundancy can be efficiently obtained with the least test times, the test efficiency and the data validity are remarkably improved, and accurate and reliable material model input is provided for vehicle collision simulation.

The application discloses a kind of based on different discrete method's multiscale simulation stability research method.Just construct the state space equation including multiple simulation step length, realize the linearization description of multiscale system by introducing time-varying parameter.Multiple rate system is linearized into single rate system by using matrix transformation, for the discretization process of multiscale system, different discrete methods are used to the subsystem of different simulation step length Discrete, convert continuous state space equation into discrete form, to determine the stability of system by classic pole position analysis.The application can process large step length non-small step length integer multiple simulation scene, and there is no quantity limit to the number of sampling step length used, with universality.Different discrete methods are used to the subsystem of different simulation step length, can balance efficiency and accuracy.The stability research method proposed in the application can quickly determine suitable simulation step length, save the time of test.

Techniques are directed to using communication metric data associated with multiple modulation schemes to achieve a link quality metric that is representative of the link as a whole, across the multiple modulation schemes that may be employed on the link. A calculation of a link quality metric may be triggered by a network layer transmission attempt, with communication metrics accumulated at the link layer of the link. A filter used to calculate the link quality metric may be updated based on network layer transmission attempts, based on successful and / or unsuccessful transmissions at a Media Access Control (MAC) layer of the link. More generally, a calculation of link quality may be triggered by a higher layer transmission attempt while being calculated based on transmission attempts at a lower layer of the link.

The embodiment of the application discloses a dynamic phasor representation DC power system random transient analysis method, relates to the power electronic field of the DC power system, and can reflect system characteristics caused by source-load random excitation conditions and multi-rate simulation, and balance the contradiction between precision and efficiency. The application comprises the following steps: obtaining DC power system parameters and setting initial parameters; obtaining circuit models of two types of lumped elements in the DC power system; establishing a dynamic phasor model of a converter station in the DC power system and obtaining a dynamic companion circuit of the converter station; using the circuit models of the two types of lumped elements and the dynamic companion circuit of the converter station, establishing a model of the DC power system; obtaining node voltage equations of the DC power system; updating a node admittance matrix and an injected current vector according to changes in a switching function of the converter station; and converting dynamic phasors output by the model of the DC power system into instantaneous values.

The present invention relates to a clock data recovery circuit, a display device, and a driving method. The clock data recovery circuit includes: a phase-locked loop circuit that generates a multi-phase clock signal based on input data and includes a multi-rate phase detector capable of operating at multiple rates and operating at an initial rate that is a predetermined one of the multiple rates in an initial interval; a lock detector that detects the locked state of the phase-locked loop circuit to generate a lock enable signal; a dead zone calibration circuit that determines a final rate corresponding to the data rate of the input data among the multiple rates in response to the lock enable signal; and a digital block that controls the multi-rate phase detector to operate at the final rate, generates a calibration enable signal, the dead zone calibration circuit determines whether the multi-phase clock signal is locked within the dead zone in response to the calibration enable signal, and changes the phase of the multi-phase clock signal when the multi-phase clock signal is locked within the dead zone.

Methods and systems of processing audio data with a multi-stage audio front end model is provided. A one-dimensional audio waveform is received as input and processed using a multi-stage audio frontend model to convert the one-dimensional waveform into a two-dimensional matrix representing features of the audio waveform. The multi-stage learnable audio frontend model is configured to apply a first filterbank to the audio waveform to generate a first time-frequency representation of the audio waveform; apply a first decimation filter to the audio waveform to generate a first decimated audio input; apply a second filterbank to the first decimated audio input to generate a second time-frequency representation of the audio waveform; and stack the first time-frequency representation and the second time-frequency representation together to generate the two-dimensional matrix.