50 results about "Multi rate" patented technology

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.

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.

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 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 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.

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.

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.

The application provides a multi-rate real-time simulation device and an input interface and an output interface modeling method. The device comprises a large-step simulation system, a small-step simulation system, an input interface and an output interface. The two simulation systems can be jointly operated through the two interfaces. The input interface can integrate the input data of the large-step simulation system and transmit the integrated data to the small-step simulation system for simulation calculation. The output interface can extract the output data of the small-step simulation system and transmit the extracted data to the large-step simulation system for simulation calculation. Therefore, the device can improve the system development and test efficiency through two data interaction links with different simulation steps. In addition, the application adopts different interface modeling methods in the two interfaces, so that the correctness of the logic design in the device can be detected in the same development environment, the design errors of the device in the development process can be excluded in advance, and the development cycle is shortened.

The invention belongs to the technical field of simulation, and particularly relates to a performance monitoring method for a multi-rate simulation model, electronic equipment and a storage medium, and the method comprises the steps: determining a minimum common period based on the step length of each subsystem in the multi-rate simulation model, and determining a target collection period based on the minimum common period; in a preset number of target acquisition periods, acquiring performance data generated by execution of each subsystem for the first time in each target acquisition period, and taking the performance data as target monitoring data; based on the target monitoring data, the performance monitoring result of the multi-rate simulation model is determined, it is ensured that observation points of all subsystems in each target acquisition period are strictly aligned in time, the problem of performance data dislocation between the subsystems is solved, and the performance monitoring accuracy is improved. The acquired target monitoring data can truly reflect the running state of each subsystem in the same reference period, the performance expression difference of each subsystem under the same time dimension is accurately reflected, and the accuracy of performance monitoring of the multi-rate simulation model is improved.

The invention discloses a multi-rate shaping filter structure based on a parallel lookup table, and relates to the technical field of satellite communication. According to the minimum sampling resolution of a set system and the number of taps of a shaping filter, a corresponding coefficient of an FIR filter is designed and stored in a parallel mode; after the design is completed, according to the accumulated step length of the configured NCO, generating a pulse of a target symbol rate, sending a modulated and mapped symbol point into a register according to the pulse, generating an address based on the current value of the NCO, reading a stored coefficient, and after the reading is completed, multiplying and accumulating based on the read coefficient and data in the register; therefore, the accuracy of communication filtering is improved.

The application discloses a multi-rate control-based aviation power source power factor correction system, comprising a multi-rate control loop and a three-phase current type rectifier; three-phase voltage on an AC side of the three-phase current type rectifier, load voltage and load current on a DC side are connected to the multi-rate control loop as input signals and feedback signals of a control process; the multi-rate control loop adopts an interrupt nested multi-rate control strategy to interpolate three-phase voltage output, and then calculates a rectifier switch tube driving signal of a fast rate, so that the switching frequency of the three-phase current type rectifier is improved without changing the sampling frequency, and the demand of the aviation power system for a method of improving the control frequency under a slow sampling frequency and a power factor correction system is solved.

This invention discloses an elastic control method for linear uncertain systems based on multi-rate state measurement information. The method includes establishing a linear dynamic model and a state estimation model based on multi-rate state measurement information of the controlled system; acquiring state measurement information of the controlled system; resetting the state of the state estimation model based on the state measurement information; designing an elastic control law based on the linear dynamic model and the state estimation model; inputting control commands based on the elastic control law into the actuator to stabilize the state of the controlled system; and controlling the system with a period T. s The above process is repeated at intervals until control ends. This invention can maintain stable system operation even when there are parameter uncertainties, actuator errors, and irregular updates of state measurement information.

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.

An apparatus and method for multi-rate encoding and decoding incorporating a generalized artificial intelligence / machine learning (AI / ML) model is provided. In one embodiment, a multi-rate encoder generates an intermediate output vector and performs a generalization, where the generalization process is one selected from a segmentation-based generalization, a downsampling-based generalization, and a quantization-based generalization. In another embodiment, a decoder receives one or more potential vectors of different sizes from one or more encoders, and generalizes each potential vector using an AI model, where the generalization process is one selected from zero fill-based generalization, up-sampling-based generalization, and dequantization-based generalization. In another embodiment, a multi-rate AI / ML auto-encoder is provided, including a multi-encoder and a multi-rate decoder. In one embodiment, a decoding AI model used by the decoder to perform the generalization differs in nature from an encoding AI model used to generate the encoded data.

The application provides a three-level inverter multi-rate control method, for any control axis of alpha beta 0: a voltage target value is subtracted from an actual value to obtain a voltage deviation, and a subscript is a control axis code; a repetitive controller is used as an input quantity, and an output result obtained is added to obtain; a state feedback controller is based on phase currents of alpha beta 0 and a control signal at a previous moment to output a control signal, and finally, the inverter is controlled to operate via 3D-SVPWM. The three-level inverter multi-rate control method can improve the dynamic performance and phase characteristics of the system by introducing the state feedback controller under the multi-rate control framework, configuring the closed-loop poles of the inverter discrete model, and thereby improving the stability of the system under the condition of downsampling.

The invention relates to the technical field of electric digital data processing and the like, and provides a lossless transmission method for a multi-rate high-bandwidth real-time data stream, which is applied to a system comprising an FPGA (Field Programmable Gate Array) and a processor. The method comprises the following steps of: caching multiple paths of source end data streams in a first-stage buffer area according to respective bandwidths on an FPGA (Field Programmable Gate Array) side, and integrating the multiple paths of source end data streams into burst data blocks; suddenly writing the data block into an off-chip DDR (Double Data Rate) serving as a second-level buffer area by using a write priority strategy; the DDR read-write state difference is monitored in real time to dynamically quantify the backpressure degree; and according to a flow control signal from the processor and a DDR backpressure evaluation result, dynamically collaborating data outflow: reading data from a DDR burst to a third-stage buffer area when a condition is allowed, and when the data volume meets the condition, sending the data to the processor through a communication interface burst. Through three-level buffering and dynamic cooperation, the contradiction between high-continuity output of the FPGA end and the processing capacity and link state uncertainty of the processor end is effectively solved, and high-throughput and loss-free data transmission in a back-end fluctuation scene is achieved.

The invention provides a multi-rate switching error code testing device and a working method thereof. The multi-rate switching 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, packaging the multi-rate switching test configuration command into a control command and issuing the control command to the control module; the control module is used for receiving a control command sent by the control terminal and scheduling the signal generation unit and the signal receiving unit to execute operation corresponding to the control command; the signal generation unit is used for preloading a test signal code pattern parameter matched with the current target rate from the multi-rate parameter library according to the control command, generating a test signal according to the test signal code pattern parameter and sending the test signal to the tested equipment; and the signal receiving unit is used for receiving an output signal output by the tested equipment according to the test signal and carrying out error code statistics on the output signal. By applying the error code testing device, the testing efficiency can be improved.