626 results about "Signal modulation" patented technology

The invention discloses a semi-supervised LPI radar signal modulation identification system and method based on entropy perception pseudo labels, and relates to the technical field of radar signal processing and mode identification. The system comprises a preprocessing module, a multi-scale reconstruction enhancer, a classification backbone network and a semi-supervised training module. The multi-scale reconstruction intensifier is used for reconstructing dual-channel separation through high-frequency detail enhancement and a low-frequency structure and enhancing discriminative characteristics in a noise environment; the classification backbone network introduces an adaptive contraction unit to realize channel-level noise suppression; and the semi-supervised training module dynamically evaluates the uncertainty of the unlabeled samples by adopting an entropy sensing mechanism, and generates weighted pseudo labels to carry out consistency regularization training. The method realizes signal modulation identification based on the system. According to the method, the problem of feature shielding under the condition of low signal-to-noise ratio is solved, the dependence of the model on labeled data is reduced through a reliable pseudo label generation mechanism, and stable and efficient modulation identification can still be realized in a severe channel environment with scarce labeled data.

The invention discloses an intelligent signal modulation identification method and system fusing time-frequency characteristics. The method comprises the following steps: extracting time-domain characteristics and frequency-domain characteristics in a radio signal in a complex baseband form; fusing the radio signal, the time domain feature and the frequency domain feature to obtain a multi-channel fusion feature; training a convolutional attention network model comprising a stem embedding layer, a plurality of cascaded feature extraction stages and a classification head; inputting the multi-channel fusion features into a trained convolutional attention network model, and performing feature extraction on the multi-channel fusion features through a stem embedding layer to obtain first extraction features; performing deep feature extraction on the first extraction feature through a plurality of cascaded feature extraction stages to obtain a second extraction feature; and inputting the second extraction feature into a classification head for signal modulation identification to obtain a signal modulation identification result corresponding to the radio signal. According to the invention, the accuracy of signal modulation identification can be improved.

The invention discloses a signal modulation identification method fused to Transform and a hybrid expert mechanism, and belongs to the technical field of wireless communication and artificial intelligence crossing. The method solves the problem that the model capacity and the adaptability to complex signals are limited by a fixed feed-forward network in the automatic modulation identification of the conventional Transform model. According to the technical scheme, the method comprises the steps of inputting dual-channel time sequence signals of in-phase components and orthogonal components; extracting preliminary features through convolution operation; the features are input into a Transform architecture integrating an attention mechanism and a hybrid expert mechanism; in the hybrid expert mechanism, calculating a routing weight through a gating network with noise routing and sparsely activating an expert network; merging expert outputs according to routing weights to obtain depth features; and finally, outputting a modulation identification result through the classifier. According to the method, the calculation efficiency is maintained while the model parameter scale is expanded, and the recognition accuracy in a complex channel environment is improved.

The invention provides an intelligent night lamp control method, device and equipment based on multi-mode AI and a medium, and is suitable for the technical field of digital dimming, and the method comprises the steps: carrying out the feature extraction of sensor data, and obtaining an environment feature data set, performing spatio-temporal behavior identification of each user and segmentation of an activity area on the environment feature data set to obtain a target area and a non-target area, calculating a preliminary illumination parameter set according to the environment feature data set, the target area and the non-target area, and performing light pollution simulation evaluation on the preliminary illumination parameter set according to the non-target area to obtain a light pollution index, and performing multi-target constraint optimization on the preliminary illumination parameter set according to the light pollution index to obtain an adjustment illumination parameter set, and performing signal modulation on the adjustment illumination parameter set according to the equipment data to generate a night lamp control signal. According to the method and the device, directional, low-interference and energy-saving safe illumination for the user getting up at night is realized through region segmentation based on user behavior recognition and regional preliminary dimming.

The invention provides a semi-supervised signal modulation identification method based on multi-codebook discrete virtual adversarial training, and the method comprises the steps: carrying out the high-dimensional potential representation coding of input labeled and unlabeled sample signals through employing a vector quantization generative adversarial network, so as to obtain a continuous potential representation; mapping the continuous potential representation into a discrete vector sequence through a quantizer; virtual confrontation disturbance meeting the condition that the L2 norm does not exceed epsilon is applied to the unlabeled sample at the input end, and a disturbance sample is generated; respectively inputting a labeled sample, a label-free sample and a disturbance sample into a classifier, calculating cross entropy loss and KL divergence consistency loss, and jointly optimizing parameters of an encoder, a codebook and the classifier in a weighted sum form; therefore, the discrete potential representation is obtained through the vector quantization generative adversarial network, disturbance is constructed for the unlabeled sample at the input end, and joint optimization is performed in combination with the cross entropy and the KL divergence loss, so that the recognition accuracy and robustness under the conditions of few labels and low signal-to-noise ratio are improved.

The invention discloses a laser radar and a signal modulation method and device of a silicon light phase shifter, and relates to the technical field of laser radars. The signal modulation method comprises the following steps: providing an initial driving voltage signal for a silicon light phase shifter, so that the silicon light phase shifter modulates a laser signal according to the initial driving voltage signal; obtaining the phase of the laser signal modulated by the silicon light phase shifter; modulating the initial driving voltage signal into a periodic modulation voltage signal according to the phase of the laser signal; acquiring a modulation slope corresponding to the modulation voltage signal of each period; performing waveform modulation on the modulation voltage signal according to the modulation slope corresponding to the modulation voltage signal of each period to determine a modulation driving voltage signal; providing the modulation driving voltage signal to a silicon light phase shifter, so that the silicon light phase shifter modulates the laser signal according to the modulation driving voltage signal, and determining a modulation laser signal; and the frequency of the modulated laser signal is linearly changed in a triangular wave form along with time. According to the invention, the measurement precision of the laser radar is improved.

The invention discloses a pre-phase-based one-bit beam reconfigurable metasurface antenna device, which comprises a pre-phase-based one-bit metasurface antenna unit which is designed by adopting a resonance scattering analysis method, two microstrip line paths with different lengths are switched through a single-pole double-throw switch, so that a 180-degree phase difference of a signal is obtained to realize 1-bit phase regulation and control, and the one-bit beam reconfigurable metasurface antenna device is obtained. Electromagnetic simulation software is utilized to optimize geometric parameters and output reflection electromagnetic response of the design model; the overall design of the reconfigurable antenna array panel is carried out based on the designed unit model, and the reconfigurable antenna array panel comprises a sub-panel composed of a plurality of low-cost microstrip antenna array units and a control panel connected with external feed equipment and a main panel.

A signal modulation chip, method, and computer-readable storage medium for optical signal modulation. The chip includes N first electrodes distributed on at least two different side edges, N modulators each connected to one electrode, an input interface for receiving optical signals, and an output interface for outputting modulated signals. Each first electrode i receives electrical signals and transmits them to corresponding modulator i. The input interface transmits optical signals to the modulators, which modulate the optical signals according to received electrical signals to obtain modulated optical signals. The output interface then outputs these modulated optical signals, enabling efficient optical signal processing through distributed electrode architecture and electrical control mechanisms.

The invention discloses a preparation method and structure of a photon integrated laser, and the method comprises the steps: dividing a device into seven functional regions, including two modulator regions, two gain regions, two front grating regions and a common rear grating region; an active material of a modulator region and a passive material of a grating region are respectively formed through two times of butt-joint growth; after sampling gratings are manufactured in the front grating area and the rear grating area, a cladding layer, a contact layer and a ridge waveguide structure grow, cantilever beam heat insulation structures are formed on the two sides of the ridge waveguide of the shared grating area, and finally electrodes of the rear functional areas are manufactured. Wavelength tuning of the two lasers is achieved by sharing the rear grating area, and the size of the lasers is effectively reduced; the cantilever beam structure of the rear grating area is utilized to effectively reduce heat conduction, improve wavelength tuning efficiency and reduce power consumption; through the double-end integrated electro-absorption modulator, bidirectional light emission of a single integrated chip is realized, signal modulation of different bidirectional light emission wavelengths can be carried out, and the utilization rate of optical fiber transmission is improved.

The invention relates to a low-noise high-precision pressure measuring circuit which comprises a bridge type sensor, an alternating-current excitation signal source, a phase-sensitive detector, a low-pass filter, a reference signal source and a signal conditioning amplifier. The alternating current excitation signal source modulates a differential voltage signal generated by the bridge type sensor to a high-frequency alternating current excitation signal generated by the alternating current excitation signal source to obtain a high-frequency pressure signal; the high-frequency pressure signal is amplified by the signal conditioning amplifier to form a modulated signal; the phase-sensitive detector performs frequency mixing on the modulated signal and a reference signal generated by a reference signal source to obtain a frequency mixing signal; the frequency mixing signal is filtered by a low-pass filter to form a direct-current voltage signal for pressure measurement; the reference signal generated by the reference signal source and the high-frequency AC excitation signal generated by the AC excitation signal source have the same frequency. According to the circuit, signals are modulated to a high-frequency area with low noise energy to be processed by adopting alternating-current excitation and coherent detection technologies, the signals and noise are effectively separated, and extremely high measurement resolution and precision are achieved.

The invention discloses a power data network wide area synchronous transmission system based on APN6 intelligent slicing, and relates to the technical field of power system communication, the service type of current transmission data is obtained through an identification embedding module, and a structured APN6 identifier is embedded in a Hop-by-Hop option header of an IPv6 extension header; the slice creation module judges whether retransmission is carried out or not according to CRC verification, dynamically creates multi-level slices according to time delay levels, and calculates an optical fiber refraction compensation value according to topological path coding; when the phase compensation module monitors that a line fault or a node is overloaded, different strategies are executed for slices of different levels, and transmission phases of slices around a fault area are adjusted through the signal modulation module; and when the slice capacity expansion module detects that the new energy cluster oscillates, bandwidth directional capacity expansion is executed according to the slice resource elastic scheduling framework. According to the method and the device, the data identification accuracy and the slice resource adaptability are improved.

The invention relates to the technical field of data processing and intelligent environment control, in particular to a sleep environment feedback control data processing method based on cognitive behavior therapy logic, which comprises the following steps: a reference model construction step: acquiring a non-contact multi-mode time sequence signal, and reconstructing a reference signal balance curve to construct a target signal manifold model; a simulation flow generation step of converting the preset interference characteristics into signal modulation operators and injecting the signal modulation operators into the model to generate a simulation signal flow; a double-track difference calculation step: executing double-track difference operation to respectively extract residual features representing system deviation and theoretical interference; a similarity judgment and control step: calculating the topological similarity of the residual features in a time-frequency domain, judging a deviation dominant type, generating a corresponding control instruction, and driving an execution mechanism to act; according to the method, psychological anxiety and environmental discomfort are effectively distinguished by using a double-track differential mechanism, and accurate attribution analysis of sleep interference sources is realized.

The invention provides a passive laser gyroscope based on a light force induced transparency effect and a measurement method thereof, the passive laser gyroscope comprises a frequency stabilized laser light source, a signal modulation input device, a balance homodyne detection device, an annular optical resonant cavity and a signal detection and feedback device, wherein a reflection cavity mirror with a photomechanical resonance structure characteristic is integrated in the annular optical resonant cavity; according to the passive laser gyroscope, a narrow transparent window modulated by a mechanical damping rate is generated on an annular optical resonant cavity of the passive laser gyroscope by utilizing a light force induced transparency effect and a light-mechanical coupling effect, so that the quality factor of the annular optical resonant cavity is improved, and the measurement sensitivity of the passive laser gyroscope is enhanced.

The invention discloses a chirp spread spectrum photon terahertz communication perception integrated system. The system comprises a coherent light source module used for generating two beams of coherent single-frequency optical carrier signals; the signal modulation module is used for generating a baseband chirp spread spectrum communication sensing integrated signal and modulating the signal to one beam to form a carrier signal; the integrated signal transmitting module is used for taking the other beam of single-frequency optical carrier signal as an optical local oscillator signal, and after the optical local oscillator signal is coupled with the carrier signal, a terahertz communication sensing integrated signal is generated and radiated through optical down-conversion; the communication receiving module is used for performing frequency conversion and demodulation on the received terahertz communication sensing integrated signal and recovering communication information in the signal; and the radar receiving module is used for performing de-chirp and target information estimation on the received terahertz communication sensing integrated signal. According to the system, the advantages of a photon terahertz architecture are fully exerted, and an ultra-wideband chirp spread spectrum integrated signal is generated, so that a communication sensing integrated system with high spread spectrum gain and high energy efficiency is realized.

The invention relates to the technical field of electrical variable measurement, solves the technical problems that in the prior art, path planning is lack of dynamics, mechanical wear is caused by frequent acceleration and deceleration of a probe, and key features are easy to omit in a complex multi-path environment, and particularly relates to a method and system for coping with an antenna performance test and a storage medium. The method comprises the steps of collecting target test frequency point data and standard signal modulation data of a target antenna, and generating synchronous excitation signal data through multi-dimensional signal processing and synchronous adjustment. The sampling efficiency and the data quality are remarkably improved through multi-stage collaborative optimization, a sampling domain is primarily selected in combination with a theoretical directional diagram and interference distribution, and the synchronous excitation signal data are generated. The method has the advantages that invalid area measurement is avoided, learning is reinforced to dynamically plan a path to reduce mechanical loss, redundancy is reduced by refining point locations, data independence and coverage are ensured by weighted evaluation, adaptability in a dynamic channel environment is higher, and the method is particularly suitable for millimeter wave and other high-dimensional antenna test scenes.

The invention discloses a multi-system adaptive switching radio direction finding method and system. The method comprises the following steps: acquiring signal modulation characteristic parameters and electromagnetic environment interference characteristic data to construct a system evaluation criterion, identifying a system mismatch sensitive area, and generating an interference weight distribution diagram and a system coverage margin; performing system competitive advantage decline analysis on the two to generate a switching urgency level and construct a hierarchical switching index set; obtaining a degradation offset coefficient through performance degradation trend tracking, and performing threshold correction on the real-time switching index to generate an adaptive switching index and a switching cooperation parameter; and tracking a system performance evolution trajectory based on the switching cooperation parameters and the interference weight distribution diagram, identifying an optimal system migration trigger point, completing optimal direction finding system selection and outputting an incoming wave direction measurement result. According to the invention, adaptive sensing of electromagnetic environment change and dynamic optimization of system switching are realized, and the accuracy and continuity of wave direction measurement in a complex interference environment are improved.

A measuring instrument includes a movable portion configured to rotate in an arc motion about a pivot portion, and an electronic position encoder configured to measure an absolute relative position between a detector portion and a scale portion, one of which forms part of the movable portion. In the detector portion, first and second scale element portions of first and second track portions are arc-shaped and parallel to each other. In the scale portion, first signal modulating scale elements are disposed along a first scale element portion according to a first signal modulating element angular spatial step θWSME1 and second signal modulating scale elements are disposed along a second scale element portion according to a second signal modulating element angular spatial step θWSME2 that is different than the first signal modulating element angular spatial step θWSME1.

The invention belongs to the technical field of photoelectric detection imaging, and particularly relates to a dim target enhancement device and method based on range gating polarization imaging, the device comprises a transmitting system and a receiving system, the transmitting system comprises a pulse laser, a signal modulation circuit and a transmitting optical system; the pulse laser is used for emitting laser beams; the signal modulation circuit is used for generating a high-frequency modulation electric signal and modulating a laser beam emitted by the pulse laser; the emission optical system is used for focusing and adjusting the light beam direction and the emergent light polarization state; the receiving system comprises a receiving optical system, a focal plane polarization detector, a synchronous control board, a signal processing board, an image processing board and display control equipment; according to the device, the pulse illumination module, the time synchronization control module and the polarization imaging module are integrated, and an image definition evaluation algorithm is combined, so that synchronous acquisition and fusion of target polarization information and distance information are realized.

The invention relates to an IRNSS navigation signal simulation generation method and system based on parameter compensation, and the method comprises the steps: receiving original signal data outputted by an IRNSS navigation receiver, and receiving a target machine position coordinate and a velocity vector; analyzing the navigation message to extract ephemeris parameters, and calculating the real-time position and velocity vector of the satellite; calculating a Doppler frequency compensation value and a pseudo code time delay compensation value; according to the pseudo code time delay compensation value and a preset target simulation coordinate, modifying a signal emission time field in the navigation message, generating a simulation navigation message frame, carrying out forward error correction coding processing, generating a coding symbol sequence, and carrying out modulo-two addition operation on the coding symbol sequence and a pre-generated PRN pseudo code sequence to obtain a baseband spread spectrum signal; generating an intermediate frequency carrier signal according to the Doppler frequency compensation value and the carrier phase; and modulating the baseband spread spectrum signal to the intermediate frequency carrier signal, and outputting an intermediate frequency analog signal. According to the invention, the concealment of signal simulation and the success rate of capturing the analog signal by the target receiver can be improved.

Network elements and methods of use, including a transmitter comprising a client-side input, signal and clock conditioning blocks, a modulation block, and antennas. The client-side input receives baseband signals having client data. The signal conditioning block adjusts signal characteristics of the baseband signals to generate intermediate signals. The clock conditioning block receives a first clock signal having a first clock frequency and adjusts signal characteristics of the first clock signal to generate a second clock signal having a harmonic frequency of the first clock frequency. The modulation block modulates the intermediate signals onto the second clock signal to generate antenna feed signals. The antennas generate radiated signals based on the antenna feed signals and couple the radiated signals into hollow waveguides. The radiated signals are radiated electromagnetic waves configured for coherent detection with a transmission frequency in a range between 300 Gigahertz (GHz) and 10 Terahertz (THz).

The invention discloses a deformation compensation control method, a deformation compensation control system and a deformation compensation control device for a special-shaped flexible display screen, which are used for improving the display consistency and the structural stability of the flexible display screen in a complex deformation state, prolonging the service life and improving the use experience. The method comprises the steps of calculating deformation characteristic parameters of different display units based on a spatial form model, and determining a target area to be subjected to deformation compensation according to a comparison result of the deformation characteristic parameters and a preset threshold value; based on the geometric direction variable quantity of the target area in the spatial form model, generating a display driving compensation parameter associated with the deformation characteristic parameter to carry out brightness and chrominance adjustment; adjusting a display driving signal modulation mode of the target area according to the thermal adjustment requirement; taking the magnetic attraction state change information as a structure side constraint condition of the deformation characteristic parameters; and carrying out constraint adjustment on the display power of the target area based on a comprehensive judgment result of the structure side constraint condition and the deformation characteristic parameter.

The invention provides a digital isolator with both high-speed communication and high common-mode transient immunity. The digital isolator comprises a transmitter, a coupling inductor and a receiver, the transmitter comprises an oscillator, a modulation capacitor assembly and a common-mode transient immunity enhancement module; the oscillator is configured to receive a data signal and generate a first differential signal based on the data signal; the modulation capacitor assembly is configured to modulate a code element 0 into a first frequency and modulate a code element 1 into a second frequency; the common-mode transient immunity enhancement module is configured to determine a bias control signal according to the first differential signal; the receiver is configured to receive the second differential signal and obtain a square wave signal based on the second differential signal; obtaining a triangular wave signal based on the square wave signal; obtaining the maximum value of a triangular wave signal according to the falling edge signal of the square wave signal; and obtaining a target data signal based on the maximum value, so as to solve the problem of low communication and common-mode transient immunity performance of the existing digital isolator.

A measuring instrument includes a movable portion configured to rotate in an arc motion about a pivot portion, and an electronic position encoder configured to measure an absolute relative position between a detector portion and a scale portion, one of which forms part of the movable portion. In the detector portion, first and second scale element portions of first and second track portions are linear and parallel to each other, with the second track portion closer to the pivot portion than the first track portion. In the scale portion, first signal modulating scale elements are disposed along a first scale element portion according to a first signal modulating element linear spatial step WSME1 and second signal modulating scale elements are disposed along a second scale element portion according to a second signal modulating element linear spatial step WSME2 different than the first signal modulating element linear spatial step WSME1.

The demodulation circuit includes a waveform regulator, a first counter, a second counter, and an SR latch. The waveform regulator generates a regulated modulation signal according to a pair of differential isolated modulation signals, which is generated according to a modulation of an input data signal with a carrier clock signal. The first counter counts cycles of the regulated modulation signal so as to generate a set signal. The second counter counts cycles of a reference clock signal so as to generate a reset signal. The SR latch includes a set terminal for receiving the set signal, a reset terminal for receiving the reset signal, and an output terminal for outputting a demodulated output signal. The SR latch is triggered by the set signal to pull up the demodulated output signal, and is triggered by the reset signal to pull down the demodulated output signal.

An optical system includes a first modulator configured to: receive first input light, modulate an amplitude of the first input light with a first data signal, modulate a phase of the first input light with a first marker signal, and output to an optical element, as first modulated light, the first input light modulated with the first data signal and the first marker signal. The optical system includes a second modulator configured to: receive second input light, modulate an amplitude of the second input light with a second data signal, modulate a phase of the second input light with a second marker signal, and output to the optical element, as second modulated light, the second input light modulated with the second data signal and the second marker signal. The second marker signal includes a complementary version of the first marker signal.

The method includes, for example in one embodiment, exposing an odorant to a sensor array having a first sensor and a second sensor respectively configured with a first response characteristic and a different second response characteristic. In one embodiment, in response to the odorant, the first sensor outputs a first sensor signal having a signal-time characteristic and the second sensor outputs a second sensor signal having a different signal-time characteristic due to the different second response characteristic. In one embodiment, the method includes generating a signal having a complex waveform shape corresponding to the odorant, and optionally to a concentration of the odorant, using the first sensor signal and the second sensor signal. The generating includes, for example in one embodiment, converting the first sensor signal and the second sensor signal into respective sensor signal modulated oscillatory signals, and combining the sensor signal modulated oscillatory signals.

An active transmission type intelligent metasurface and a matching circuit applied to the intelligent metasurface, the circuit comprising: a receiving antenna for receiving an electromagnetic wave signal; a power amplification unit for amplifying the electromagnetic wave signal received by the receiving antenna; a phase coupling unit for modulating the amplified electromagnetic wave signal into electromagnetic wave signals with various phase differences; a phase selection unit for selecting an electromagnetic wave signal with a required phase difference from the electromagnetic wave signals with various phase differences; and a radiation antenna for radiating the electromagnetic wave signal with the corresponding phase difference; the intelligent metasurface comprises a plurality of active transmission intelligent metasurface units arranged periodically to form an N*M array, and each active transmission intelligent metasurface unit in the array comprises an active transmission circuit. The present application realizes the active amplification function which the existing transmission RIS structure does not have and has the 2-bit phase control function, and the present application has low design complexity, low deployment cost and good system performance.

According to one aspect, a medical device system for visualizing internal patient anatomy may comprise: a shaft including a distal tip portion, the tip portion including an imaging device, and a signal modulator; and a control unit operatively coupled to the shaft and including a de-modulator. The imaging device may be configured to output a first signal to the signal modulator. The signal modulator may be configured to modulate the received first signal and output a modulated second signal to the control unit; and the de-modulator of the control unit may be configured to receive the modulated second signal, de-modulate the second signal, and output a de-modulated third signal. The control unit may be configured to output the de-modulated third signal to an electronic display.

This invention relates to the field of signal processing technology and discloses a multi-band UAV signal jamming system. The system includes modules for signal acquisition, frequency band analysis, jamming generation, signal modulation, and integrated control. The signal acquisition module collects various types of signals from the UAV, the frequency band analysis module precisely analyzes these signals, the jamming generation module adaptively generates jamming signals, the signal modulation module optimizes modulation, and the integrated control module regulates transmission and jamming effects in real time. This system can comprehensively acquire signals, deeply analyze frequency band characteristics, adaptively generate jamming signals and optimize modulation, and monitor and adjust the jamming effect in real time, significantly improving the accuracy, targeting, and persistence of jamming, effectively addressing the challenges of UAV supervision. Compared to traditional jamming technologies, it overcomes the limitations of single-band jamming and weak signal analysis and processing capabilities, possesses good versatility and scalability, is suitable for various scenarios, and provides reliable technical support for UAV management.

This utility model discloses a visible light communication transmitting device, relating to the field of visible light communication technology. The visible light communication transmitting device includes a format conversion circuit, a bandwidth expansion circuit, a level bias circuit, and a modulation and LED array circuit connected in sequence. The input terminal of the format conversion circuit receives a high-speed differential electrical signal, and the output terminal outputs a serial electrical signal. The input terminal of the bandwidth expansion circuit receives the serial electrical signal, and the output terminal outputs an inverted high-speed signal. The input terminal of the level bias circuit receives the inverted high-speed signal, and the output terminal outputs a forward high-speed signal. The input terminal of the modulation and LED array circuit receives the forward high-speed signal, and the output terminal outputs visible light. This utility model can reduce the hardware cost of the device while ensuring a large bandwidth for the visible light communication device.