132 results about "Bandwidth (signal processing)" patented technology

The invention provides an electroencephalogram signal artifact removing method and device, equipment and a medium, and relates to the technical field of biological signal processing, collected electroencephalogram signal data is processed to obtain an optimal modal number and an optimal bandwidth parameter, and the optimal modal number and the optimal bandwidth parameter are used for conducting self-adaptive variational mode decomposition on the electroencephalogram signal data to obtain a plurality of modal components; then carrying out multi-dimensional feature analysis to obtain a plurality of feature indexes for judging an artifact suspicion mode and an effective mode component; performing short-time Fourier transform on the artifact suspicion mode, and constructing a time-frequency confidence map to guide weighted time-frequency independent component separation on the artifact suspicion mode to obtain an artifact component; suppressing the artifact component to obtain a suppressed independent component, and performing weighted reconstruction and multi-component fusion on the suppressed independent component and the effective modal component based on the time-frequency confidence map to obtain an artifact-removed electroencephalogram signal; and the fidelity, the robustness and the real-time performance of the electroencephalogram signal are improved.

The invention provides a synchronization signal processing method and an artificial intelligence chip. The synchronization signal processing method comprises the following steps: receiving a synchronization signal reading request with a prompt sign sent by a first processing core; confirming that the synchronization signal reading request is a synchronization operation according to the prompt sign; determining that storage addresses in an effective state exist, and determining whether a target storage address matched with the target program segment identifier and the target synchronous address identifier exists in the storage addresses in the effective state; if the target storage address exists, when the synchronization value in the target storage address is the same as the target synchronization value, returning a synchronization success message to the first processing core, and adjusting readable times in the target storage address; the time spent on reading the synchronizing signal is greatly shortened, the time is saved, the delay is reduced, and the processing efficiency of the processing core is improved; moreover, the bandwidth can be saved, the bandwidth waste is avoided, and the working efficiency of the whole system is improved.

The invention relates to the technical field of indoor positioning, in particular to a millimeter wave CSI (Channel State Information) indoor positioning method and system based on a generative adversarial network, and millimeter waves are large in bandwidth, narrow in beam, high in time resolution and space angle resolution and capable of reducing the influence of a multipath effect. Position estimation is directly obtained from CSI data directly obtained in the millimeter wave communication process, complex signal processing and filtering steps of obtaining other parameters from CSI are avoided, and the system calculation complexity is greatly reduced. The information of the AP position is extracted from the high-dimensional observation vector by using the generative adversarial network, so that complex positioning algorithms such as Kalman filtering or graph optimization are avoided, and the calculation complexity is reduced; according to the method, AP position estimation is obtained through confrontation training of the generator and the discriminator, position coordinates of reference points do not need to serve as labels, input data are all label-free data, dependence on marked data is avoided, and prior knowledge such as the AP or the reference points is not needed.

The present disclosure provides a radio frequency receiving unit and a method of signal reception thereof, in particular, a radio frequency receiving unit is provided. The radio frequency receiving unit comprises a plurality of signal processing paths, at least one receiving port, each of the at least one receiving port being configured to receive a received signal having any frequency within a full bandwidth encompassing a predetermined range of frequencies, a frequency detection unit configured to detect a frequency band to which the received signal belongs, and a control unit configured to control routing, based on the detected frequency band, of the received signal to a corresponding signal processing path for processing.

The application provides a device for adopting multi-channel transmitting signals, and belongs to the technical field of signal processing. The device comprises multiple signal transmitting branches, each of which comprises a directional antenna and a radio frequency channel connected with the directional antenna; a baseband module connected with the multiple signal transmitting branches; the radio frequency channel comprises a first band-pass filter, a second band-pass filter, a first radio frequency switch and a gain adjusting module; the first radio frequency switch is used for selecting the first band-pass filter or the second band-pass filter to be communicated with the gain adjusting module according to the working mode of the device for adopting multi-channel transmitting signals, so as to output the filtered target bandwidth signal through the directional antenna, output the filtered target bandwidth signal through the directional antenna in each signal transmitting branch, and further provide a test scene for a to-be-tested wearable device, so that the performance verification of the to-be-tested wearable device does not need to be carried out in an actual scene, the verification cost is reduced, and the verification efficiency is improved.

The application discloses a kind of distributed array high-precision time synchronization method based on compressed sensing (CS) and secondary least square (QLS), belong to wireless communication and radar signal processing technical field.For under the restriction hardware bandwidth and strong multipath environment, traditional cross-correlation method is limited by Rayleigh resolution and sampling grid, there is the problem of serious peak aliasing, insufficient synchronization accuracy, the application proposes CS-QLS joint decoupling strategy.The method constructs frequency domain observation matrix and high-density time delay over-complete dictionary by transmitting sparse multi-tone probe signal, reconstructs sparse channel impulse response using CS, separates multipath aliasing and determines direct wave coarse synchronization boundary;Further combined with main path and adjacent grid point amplitude information, QLS is used to fit continuous domain peak position, and grid mismatch error is corrected.The method breaks through the limitation of physical bandwidth and sampling grid, and realizes nanosecond-level high-precision time synchronization in complex non-line-of-sight environment with very low computational complexity.

The application discloses a differential phase encoding optical communication method, device and system based on probability shaping, relates to the technical field of optical communication, and the differential phase encoding optical communication method based on probability shaping comprises the following steps: at a sending end, the probability of differential phase occurrence is changed, so that the code type with small phase change has a large occurrence probability, and the code type with large phase change has a small occurrence probability, so as that the spectrum of a sending signal is compressed; and a sending signal with compressed spectrum is modulated and transmitted. The application can keep the signal processing structure of the original system unchanged, effectively reduce the signal bandwidth through the coding mode, reduce the ISI between code types, and improve the system performance.

An imaging device according to one embodiment of the present disclosure includes a multispectral sensor section, a narrowband signal generator, and a controller. The multispectral sensor section outputs a plurality of (N) wavelength signals as pixel signals. The narrowband signal generator uses a coefficient matrix to generate, from the plurality of wavelength signals output from the multispectral sensor, a plurality of M (M>N) narrowband signals that is narrower in bandwidth than the wavelength signa. The controller calculates an evaluation value by performing weighted average processing on the plurality of wavelength signals or a plurality detection values generated using the plurality of wavelength signals, and performs exposure control of the multispectral sensor section on the basis of the calculated evaluation value.

The application discloses a trigonometric function window generating method based on DSP, which comprises the following steps: converting the cosine term of the trigonometric function window into the n-th power form of the complex exponential fixed value based on the Euler formula; after the program initializes the calculation of the fixed value, generating the complex exponential term of each point sequence by recursive multiplication and storing the complex exponential term in the first-level storage space of the DSP; then, the SIMD parallel operation is realized by using the in-line function of the DSP, the first half of the window function values are calculated and stored; the first half of the window function values are inversely symmetrical copied to generate the second half of the window function values; finally, the hardware adaptive memory allocation is completed by combining the hierarchical storage architecture of the DSP, the stack is allocated to the first-level storage space, and the window function generation is completed by summarizing the data. The application greatly reduces the operation amount and the storage occupation, guarantees the calculation precision, deeply adapts to the hardware characteristics of the DSP, can efficiently generate the Hanning, Hamming and Blackman trigonometric function windows, and meets the real-time and high-precision requirements of the signal processing with large bandwidth and high sampling rate.

The invention provides a vehicle-mounted SDR monitoring method and device for mobile monitoring of an urban electromagnetic environment, and the method comprises the steps: receiving and down-converting a radio frequency signal through a radio frequency front-end module, carrying out the analog-to-digital conversion and digital down-conversion of a signal processing module, and carrying out the spectrum analysis through a main control and analysis module; when the monitoring bandwidth exceeds the single sampling capability of hardware, a step tuning strategy is adopted to carry out segmented scanning and frequency spectrum splicing; performing standardization processing on the data through a power calibration model, and finally uploading the standardized spectrum data through an MQTT protocol; according to the invention, a reconfigurable SDR platform is adopted, and step tuning, power calibration and lightweight transmission mechanisms are combined, so that the technical problems of limited bandwidth, hardware rigidity, unreliable data transmission, uncomparable measurement results and the like of traditional monitoring equipment are solved, and broadband, high-precision and high-efficiency urban electromagnetic environment mobile monitoring is realized.

The application discloses a long-term service hydroelectric generating set operation state evaluation and early warning method and system, and belongs to the technical field of hydroelectric generating set state monitoring and fault early warning. The application converts a traditional point-to-point regression problem into a signal recovery problem in graph signal processing based on a graph smoothing regression method, integrates and constructs a high-dimensional working condition space adaptive neighbor graph by integrating a training set and a to-be-measured set, calculates an edge weight through an adaptive kernel bandwidth and constructs a graph Laplace matrix, introduces a variational objective function with global potential energy anchoring to complete full graph signal analytical solution, obtains a health benchmark value corresponding to a working condition, and realizes unit state evaluation and adaptive early warning through residual comparison of a measured value and the health benchmark value. The application has strong robustness, high full-working-condition evaluation accuracy, and can stably anchor the health benchmark without fault samples, accurately identifies early performance degradation of the unit, and is suitable for state maintenance application of long-term service pumped storage units.

The invention discloses an MEMS digital accelerometer bandwidth test system and method. The system comprises a linear vibration control test bench, a digital-to-analog conversion module, a synchronous data acquisition card and an accelerometer signal processing module. The method comprises the following steps: connecting an MEMS digital accelerometer bandwidth test system and starting the MEMS digital accelerometer bandwidth test system; the linear vibration control test bench receives the frequency specified by the accelerometer signal processing module and drives the MEMS digital accelerometer to be tested to vibrate; the linear vibration control test bench outputs a reference analog signal V1 to the synchronous data acquisition card; the digital-to-analog conversion module is used for converting a digital signal of the MEMS digital accelerometer to be tested into an analog signal V2 to be tested and sending the analog signal V2 to the synchronous data acquisition card; the synchronous data acquisition card carries out synchronous digital processing on the analog electric signals V1 and V2 and then sends the analog electric signals V1 and V2 to the accelerometer signal processing module; and the accelerometer signal processing module adopts an RFFT weighting algorithm based on a self-adaptive sliding window to obtain the bandwidth of the MEMS digital accelerometer, and outputs a dynamic characteristic curve of the MEMS digital accelerometer to be measured.

The application discloses a decision feedback equalizer for PAM4 encoding band infinite impulse response filter, belongs to the field of signal processing, and comprises a high-pass filter and a linear equalizer, a decision feedback adder, and an infinite impulse response filter coefficient feedback control module; noise filtering is performed on a high-speed signal, low-frequency attenuation of the high-speed signal is compensated, a tailing effect in a frequency response is eliminated, high-speed inter-symbol interference is suppressed and eliminated, and an offline post-cursor in the frequency response is fed back and compensated; meanwhile, aiming at PAM4 encoded data, an RLM (Level separation mismatch ratio) calibration module and a clock data recovery circuit are added, which are used for improving the speed of clock receiving and recovery, and due to the addition of more high-speed modules, the load of the equalization adder is increased; the application uses a layout planning of a double-difference six-port mutual inductance bridge type (T-coil) inductive network, and bandwidth is expanded by using inductive peaking technology.

The present application relates to radar target recognition tracking technical field, especially in the field of phased array radar multi-target adaptive identification method and system, including: first, the radar echo and platform attitude data are acquired, the velocity distribution is extracted and the target is divided into two groups of high speed / low speed; for high speed group, the displacement prediction parameter is extracted to adaptively adjust the beam pointing sequence, for low speed group, the pulse repetition frequency is determined based on the residence time window and the frequency shift characteristics, and the resource allocation scheme is generated; then the attitude correction result is integrated into the beam control parameter, the adaptive observation sequence is generated combined with the resource scheme, and the trajectory information is tracked in real time; again, the Doppler shift deviation is estimated according to the trajectory, the gain / bandwidth and other signal processing parameters are compensated online, and the corrected target position and velocity are output. The present application realizes three-dimensional high-precision identification, continuous stable tracking and efficient resource utilization in complex dynamic scene.

The invention discloses a high-parallelism data acquisition and playback method, device and system based on an FPGA (Field Programmable Gate Array), and belongs to the field of signal processing, and the method comprises the following steps: S1, data acquisition: accessing an external signal, sequentially completing signal filtering, band-pass sampling and ADC (Analog to Digital Converter) conversion, and then storing; and S2, data playback: sequentially performing first caching, orthogonal down-conversion, low-pass filtering, second caching, interpolation, orthogonal up-conversion and DAC conversion on the acquired data, and outputting the data to related receiving equipment. The system supports high-speed data acquisition, high-throughput signal storage and large-bandwidth signal playback, and has a very high engineering application value.

This invention addresses the problem that the direct zeroing method used in existing satellite navigation signal processing frequency domain FFT notch filtering easily leads to power loss near interference frequencies, affecting signal integrity. It proposes a narrowband interference suppression system and method for BeiDou navigation. The narrowband interference suppression system includes a BeiDou RF front-end module, a high-speed ADC sampling module, a digital down-conversion (DDC) module, a signal distributor and buffer module, an interference detection and parameter estimation unit, an interference suppression execution unit, a baseband correlation and demodulation module, and a navigation and positioning result output module. A cascaded array of IIR notch filters is constructed using a cascaded array module. A steep transition band is achieved through small-order serial units, and the stopband width of the notch filters can be flexibly adjusted via a convergence factor. This enables precise suppression of extremely narrow stopband interference at different bandwidths, filtering out signals only at interference frequencies, effectively avoiding impact on surrounding useful BeiDou signals and preventing spectrum leakage.

The application provides an analog-digital converter, a method for improving bandwidth of the analog-digital converter and an electronic device, and relates to the technical field of signal processing. A dynamic amplifier and a time-to-digital converter are added in the SAR ADC. The first input end of the dynamic amplifier is coupled with a capacitor array, the second input end of the dynamic amplifier is coupled with a comparator, and the output end of the dynamic amplifier is coupled with the time-to-digital converter. When the comparator enters a metastable state, the dynamic amplifier receives a control signal sent by the comparator, converts an input analog electric signal into a time sequence signal with time, and then converts the time sequence signal into a digital signal through the time-to-digital converter, so that higher resolution is obtained at the same time, that is, the conversion speed of the SAR ADC is improved, and the single-channel bandwidth of the SAR ADC is improved.

The application discloses a target channel selection output method and system for frequency division multiplexing superconducting detectors, and belongs to the technical field of digital signal processing and superconducting detector readout electronics. The method aims at the problems of high resolution channelization resource occupation, high full spectrum output bandwidth pressure, and obvious spectrum leakage and crosstalk under high multiplexing ratio. On the basis of high resolution channelization processing, the mapping relationship between target frequency points and channels and the target channel selection output mechanism are introduced. After the wideband digital input signal is processed by the polyphase filter bank channelization, only the complex data corresponding to the target frequency points containing effective signals are selected and output, and are further separated into I / Q data stream output. The scheme combines high resolution channelization processing with the mapping driven selection output mechanism, reduces resource occupation and data transmission bandwidth while ensuring frequency resolution, and improves real-time performance and signal fidelity in the readout scene of high multiplexing ratio detectors.

A photonic-integrated distributed acoustic sensing system (DAS) with long-distance and wide-frequency response includes: a low-voltage DC electric drive module, an optical transmitter chip, an integrated optical amplification module, an optical receiver chip, a signal conditioning and acquisition chip, and a digital signal processing chip that are sequentially connected. The photonic-integrated DAS system has the features of extended monitoring distance, broad frequency response bandwidth, high signal fidelity, ultra-sensitive detection capabilities, low power consumption, compact form factor, and robust environmental adaptability.

The present application relates to a digital pre-distortion processing circuit and a signal processing device, the digital pre-distortion processing circuit comprising a narrow-band spread spectrum module, a digital pre-distortion module and a filtering module. The narrow-band spread spectrum module is used to spread the input narrow-band radio frequency signal into a wide-band radio frequency signal. The bandwidth of the wide-band radio frequency signal is a preset bandwidth. The digital pre-distortion module is used to perform digital pre-distortion linearization processing on the wide-band radio frequency signal to obtain a linearized wide-band radio frequency signal; the preset bandwidth is located within the optimal cancellation bandwidth of the digital pre-distortion module. The filtering module is used to perform signal filtering on the linearized wide-band radio frequency signal to obtain a linearized narrow-band radio frequency signal. The digital pre-distortion linearization processing on the narrow-band radio frequency signal is realized, and the cancellation capability of the digital pre-distortion system for the narrow-band radio frequency signal is greatly improved.

This invention discloses an on-chip integrated two-dimensional van der Waals heterojunction high-speed photodetector and its fabrication method, comprising: a substrate constructed sequentially from bottom to top; an optical waveguide; a heterojunction composed of stacked graphene and black phosphorus layers; metal electrodes respectively contacting the graphene and the black phosphorus; and an alumina layer covering the surfaces of the black phosphorus and graphene layers for protection. This invention achieves an operating bandwidth greater than 40 GHz, significantly improving the applicability of the photodetector in high-speed communication and high-frequency signal processing, meeting the performance requirements of future ultra-high-speed optoelectronic systems. By optimizing the black phosphorus and graphene heterojunction structure, dark current is suppressed to the microampere level, while a high responsivity of 18 mA / W is achieved at a wavelength of 1.55 μm, providing high-sensitivity photodetection capability. By covering the channel material surface of the device with an alumina protective layer, the environmental adaptability and long-term operational stability of the heterojunction are significantly improved, ensuring high reliability and stability of the device under complex environmental conditions.

This invention discloses a high-performance signaling analysis and verification processing method in mobile communication networks, belonging to the field of mobile communication. The system includes: accessing OTN and SDH signals using channelization equipment, performing polling analysis to identify and extract signaling data streams from the signals, encapsulating the signaling data streams as E1 data streams, automatically aggregating and tracing the source, and outputting them to a signal processing device; the signaling analysis and verification processing service is deployed as a backend service on multiple computing blades of the signal analysis and processing device; the signaling analysis and verification processing service employs a cascaded E1 data stream parallel acquisition module, an E1 data analysis module, an SS7 signaling data analysis module, and an information matching verification module, performing signaling analysis and verification processing on the E1 data streams through a pipelined data processing framework. The system of this invention can improve data access bandwidth and efficient parallel processing capabilities, enhancing the completeness and comprehensiveness of signaling data processing functions.

The application discloses a low-resource-overhead super-high-speed modulation and demodulation method. In view of the signal processing demand faced by high-frequency bands and large bandwidths in millimeter wave and terahertz communication, the application adopts a parallel architecture to meet the high-speed signal processing demand and correct non-ideal characteristics of a channel; and adopts a fusion processing method to fuse interpolation, anti-aliasing, timing interpolation, matched filtering, time domain equalization and decimation into a multi-phase filter, so that the signal overhead caused by high-speed demodulation is greatly reduced. The application can be applied to a millimeter wave / terahertz super-high-speed transmission system, and provides low-complexity super-high-speed modulation and demodulation to meet the performance and resource demand of super-high-speed transmission.

The present application relates to the technical field of electronic measurement, more particularly, it is especially related to a composite pressure expansion, flow expansion and frequency expansion circuit, which comprises an input signal source, a front-stage precision operational amplifier circuit, a rear-stage high-voltage and high-current operational amplifier circuit and a feedback loop, the input signal source is connected with the input end of the front-stage precision operational amplifier circuit, the output end of the front-stage precision operational amplifier circuit is connected with the input end of the rear-stage high-voltage and high-current operational amplifier circuit, and the feedback loop is connected between the output end of the rear-stage high-voltage and high-current operational amplifier circuit and the input end of the front-stage precision operational amplifier circuit.The present application uses cascaded operational amplifier circuits to realize a high-precision, high-voltage, high-current and wide-frequency output circuit.Through multi-stage operational amplifier cascading and feedback configuration, higher closed-loop gain is obtained under the premise of ensuring stability, and the effective bandwidth is expanded to meet the high-frequency or high-gain signal processing requirements.

The application discloses a distributed digital coverage system, comprising an access unit, an extension unit MEU and a remote unit; the access unit comprises a TDD radio frequency signal processing subsystem, an FDD radio frequency signal processing subsystem, a multi-channel radio frequency transceiver subsystem, an FPGA processing subsystem, a signal coupler, a signal feature analysis and / or time domain synchronization module and an MCU core master control module. The technical scheme of the application does not blindly amplify the signals of the whole bandwidth, and does not require any prior information, and can detect and analyze the signal system, frequency band, frequency point, bandwidth and carrier number feature information of the signal actually working in real time and adaptively.

The present disclosure provides a laser measurement system and method, which is applied to the field of microwave photon technology. The system comprises an antenna, a microwave source, a laser, a polarization controller, a double parallel Mach-Zehnder modulator, an electrical coupler, a photoelectric detector and a signal processing module. The antenna is used to receive a return signal, the microwave source is used to emit a reference signal, the polarization controller controls the polarization direction of the optical carrier emitted by the laser, the return signal and the reference signal are modulated onto the optical carrier with the controlled polarization direction through the double parallel Mach-Zehnder modulator, and a modulated optical signal is output, the modulated optical signal enters the signal processing module after frequency mixing processing by the photoelectric detector, and the signal processing module outputs a final result to obtain the measurement results of Doppler shift and angle of arrival at the same time. The present disclosure can realize the simultaneous measurement of Doppler shift and angle of arrival, determine the direction of Doppler shift, and is not limited by electromagnetic interference and working bandwidth, and has a very large working bandwidth.

The present application relates to radar target detection and identification technical field, especially in kind, a kind of dual-rotor micro-doppler feature extraction method and system, first to the echo sequence of dual-rotor unmanned aerial vehicle carries out the micro short-time Fourier transform, obtains initial amplitude spectrum matrix;Secondly, according to initial amplitude spectrum matrix, calculate the gentle loss function of party damage;Then using gradient descent method, according to the window length of time window function in gentle party damage loss function adaptive closed loop iteration optimization, output the optimal window length of time window function;Finally, according to the optimal window length, determine the time-frequency feature map spectrum.The present application parameterizes and differentiable time-frequency transform process, uses gradient descent adaptive to find optimal window length, does not change analytical bandwidth with frequency, but is matched with global optimal bandwidth to target characteristic frequency, solves the problem that resolution and cross term cannot be considered in traditional method in dual-rotor signal processing.

The application discloses a method for expanding the instantaneous bandwidth of optical sampling analog-digital conversion of a linear frequency modulation signal, and relates to photoelectric technology. An input linear frequency modulation signal is converted into a digital signal by an optical sampling analog-digital converter. A digital signal processing unit firstly performs interpolation twice on the output digital signal in sequence, then performs fractional Fourier transform on the interpolated signal and performs digital filtering in the fractional domain, and finally performs inverse fractional Fourier transform on the filtered data. Therefore, the input linear frequency modulation signal with a signal bandwidth not greater than twice the instantaneous bandwidth of optical sampling can be received without aliasing. The method uses an interpolation algorithm to improve the equivalent sampling rate of the system, and realizes non-aliasing reception of a full-symbol wideband linear frequency modulation signal through twice interpolation. In addition, the influence of image signals and stray signals can be eliminated by means of the fractional Fourier transform and filtering algorithm, and finally the instantaneous bandwidth of optical sampling analog-digital conversion of the linear frequency modulation signal is expanded to twice the original.

The embodiment of the invention provides a plasma voltage characteristic on-line monitoring device and method, and the device comprises a detection handle assembly, a shielding cable, a monitoring host, a signal processing module employing a resistance-capacitance voltage division and operational amplification architecture with AC amplitude-frequency characteristic compensation, and a full-scale linear non-step ADC sampling module. And in combination with a sliding window type transient voltage capture algorithm, plasma voltage signals are acquired, processed and monitored. By means of the technical scheme, full-scale high-precision online detection of the plasma voltage characteristics within the bandwidth ranging from-500 V to + 500 V and 0-2 MHz can be achieved, data support is provided for performance calibration and closed-loop adjustment of plasma cleaning equipment, and the risk of electrical damage to workpieces in the plasma cleaning process is greatly reduced.

The invention relates to a reference signal processing method and device, equipment, a storage medium and a program product. According to the method, CSI-RS parameters of a cell are read from a cache, the CSI-RS parameters are divided into multiple sets of CSI-RS parameters, multiple signal mapping processing units are called according to the multiple sets of CSI-RS parameters to carry out parallel processing on multiple sets of reference signals, a target reference signal is output, and each set of reference signals comprises multiple types of CSI-RS reference signals. According to the method, a plurality of signal mapping processing units are arranged, so that a multi-set parallel processing CSI-RS method adaptive to bandwidth configuration of various types of reference signals is realized, and the efficiency of processing various types of CSI-RS signals by access network equipment can be greatly improved.