155 results about "Phase distortion" patented technology

The invention discloses a main power grid short-time load prediction method using a hybrid active filter, and particularly relates to the technical field of load prediction. The method comprises the following steps: acquiring active control parameters and passive branch parameters of a hybrid active filter, combining a real-time load fluctuation signal of a main power grid, extracting harmonic suppression characteristics and phase distortion characteristics, and analyzing and generating a time scale compensation factor through a dynamic coupling effect; and constructing a phase correction model based on the transient harmonic residual component and the time scale compensation factor, and performing frequency domain and time domain combined reconstruction on the real-time load fluctuation signal to obtain a corrected load fluctuation characteristic sequence. A short-time load prediction model is calibrated through a collaborative mapping relation, a load power prediction value of a main power grid in a future preset time window is output, a secondary high-frequency interference signal generated by real load fluctuation and filter self-resonance is effectively distinguished, and the problem of coupling interference of harmonic residual components on the load prediction model in a power grid impedance sudden change scene is solved.

The invention discloses a BIM (Building Information Modeling)-based large-span post-tensioned bonded prestressed beam construction method. The BIM-based large-span post-tensioned bonded prestressed beam construction method comprises the following steps: collecting a vibration signal of a working rib and a matt rib reference signal of a matt rib; inputting the dummy rib reference signal into an adaptive filtering algorithm to which phase preserving constraint is applied, and performing noise cancellation processing on the working rib vibration signal to generate a purified pressure wave signal; performing multi-scale decomposition on the purified signal, extracting propagation time delay of the direct wave based on coherence analysis among components, and generating a phase-time delay characteristic matrix; and based on pre-configured geometric parameters of the BIM three-dimensional model, a real-time stress distribution field is calculated through inversion according to the phase-time delay characteristic matrix, and the real-time stress distribution field is synchronously updated to the BIM three-dimensional model. According to the method, the phase distortion problem under noise interference is solved through a physical reference channel and phase preserving filtering, the accuracy of time delay extraction is improved through a multi-path separation technology, and high-precision and high-robustness real-time monitoring of the prestress is achieved.

Apparatus, methods, and computer-readable media for facilitating multiplexing of uplink signals at a repeater are disclosed herein. An example, a method for wireless communication at a repeater, includes obtaining a first uplink signal associated with a UE. The example method also includes providing a first uplink communication including the first uplink signal multiplexed with a second uplink signal, the second uplink signal being associated with an MT component of the repeater. Additionally, the example method includes obtaining a multiplexing configuration based in part on at least one of a phase distortion and a power mismatch associated with the first uplink communication. The example method also includes providing a second uplink communication based in part on the multiplexing configuration, the second uplink communication including a third uplink signal multiplexed with a fourth uplink signal.

The invention relates to the technical field of image processing, in particular to an optical thin film quality detection method based on image processing, which comprises the following steps: S101, acquiring a transient light field image sequence of an optical thin film in a dynamic stress field; s102, performing spectral analysis on the brightness time sequence of each pixel point, extracting a dominant frequency component as a brightness oscillation period, processing time domain fluctuation data by adopting a Fourier transform algorithm, and calculating a local optical path difference variation based on the brightness oscillation period of each pixel point in the image sequence; and S103, projecting the phase distortion field to a preset film elastic modulus distribution model, establishing a phase distortion-stress distribution-defect mapping relation, and identifying a modulus mutation region. A dynamic stress field is generated through the synergistic effect of mechanical vibration and thermal radiation, remarkable stress concentration can be generated at the micro-defect position, the deformation difference of the micro-defect is amplified, and therefore the sensitivity of defect detection is improved.

The invention relates to the technical field of optical detection, and discloses an object surface three-dimensional topography measurement method based on optical interference, which comprises the following steps: acquiring a mixed time domain interference signal sequence in an axial scanning process; extracting seed pixels and constructing a spatial topology connectivity feature matrix; introducing fractional Fourier transform, and constructing a joint decoupling objective function containing a frequency domain nonlinear phase distortion evaluation index and a time domain physical invariant evaluation index; executing multi-stage optimization for the seed pixels, and locking a global optimal rotation angle; array self-adaptive decoupling is executed in combination with the spatial topology connectivity feature matrix, and an optimal rotation angle matrix is generated; and performing signal decoupling and reconstruction on the mixed signal, and extracting the absolute surface height of each pixel point to generate three-dimensional shape data. According to the invention, through multi-dimensional joint decoupling and spatial prior constraint, the problem of phase decoupling caused by film interference aliasing is solved, and the calculation overhead of a large-pixel array is reduced while the measurement precision is improved.

The invention relates to the technical field of industrial vision, in particular to an automobile part surface defect detection method and system based on machine vision, and the method comprises the steps: firstly loading a CAD three-dimensional model, and rendering an ideal fringe reflection map in a virtual environment; calculating an optical distortion correction matrix by comparing the phase distortion with the phase distortion of an actual initial reflection image, driving a programmable light source to project a compensation pattern, and generating a normalized reflection intensity image; signal object decoupling is achieved through multi-scale wavelet transform, and high-frequency components and low-frequency components are separated; homomorphic filtering is applied to the low-frequency component to construct a homogenized background model, the high-frequency component is reversely corrected, and a high-signal-to-noise-ratio defect signal image is output; generating a coarse segmentation mask by the high-frequency signal through an adaptive local threshold, generating a morphology anomaly mask by the low-frequency signal through Hessian matrix morphological analysis, and fusing to form a collaborative segmentation mask; and extracting multi-dimensional geometric attributes of connected domains in the masks, and inputting the multi-dimensional geometric attributes into a decision tree to realize accurate classification and confidence output of defects.

The invention discloses a dynamic regulation and control method and system for a drilling tool of a machine tool, relates to the field of mechanical automation, and solves the problems that the tool monitoring cost is high, the number of misinformation and missing information is large, and the chip removal efficiency is low. Constructing a cutting impedance dynamic model, inputting spindle motor current, motor voltage, spindle rotating speed, motor internal resistance, motor operation frequency and time information into the cutting impedance dynamic model to obtain cutting impedance, and determining an impedance break variable according to the cutting impedance; determining a current phase difference offset and a reference phase difference, and calculating a cutter phase distortion index according to the offset and the reference phase difference; the cutter phase distortion index and the impedance break variable are fused to generate a comprehensive health index; compared with a traditional method, the method has the advantages that the detection precision is high, the false alarm rate is low, the response speed is high, the hardware cost is reduced, and the service life of a tool is prolonged.

The invention discloses an underwater target positioning method and system based on dynamic error suppression, and a terminal, and the method comprises the steps: obtaining a vibration signal of an underwater target through a distributed optical fiber sound wave sensing technology, obtaining a rough position of the underwater target according to the vibration signal, and carrying out the positioning of the underwater target according to the rough position; obtaining a first time difference through a sound field propagation phase compensation model, and correcting the phase distortion of the rough position according to the first time difference to obtain a first accurate position; acquiring strain data of the optical fiber, obtaining an actual curvature radius of the sound wave propagation path by using the strain data, obtaining a second time difference according to the actual curvature radius, and correcting the deformation of the optical cable at the first accurate position according to the second time difference to obtain a second accurate position; dynamically compensating the sound path difference according to the second time difference to obtain a corrected sound path difference, and obtaining a final accurate position according to the corrected sound path difference; and performing coordinate conversion on the final accurate position to obtain a real coordinate. According to the invention, the precision of underwater target positioning is obviously improved.

The invention relates to the technical field of high-precision satellite navigation, and particularly discloses a control method for introducing amplitude-phase distortion by anti-interference weighting of high-precision anti-interference navigation, which comprises the following steps of: aiming at amplitude-phase distortion difference caused by self-adaptive zero-setting anti-interference and multi-beam anti-interference processing; total amplitude phase distortion introduced after self-adaptive zero-setting anti-interference and multi-beam anti-interference weighting is calculated respectively, and total amplitude phase compensation needing to be carried out before a certain satellite signal is captured and tracked is obtained. According to the method, the thought of converting zero into integer and compensating for loss is adopted, and the total amplitude phase distortion introduced by anti-interference weighting to a satellite signal is calculated by means of a steering vector of the satellite signal; before the satellite signal is captured and tracked, total amplitude-phase distortion introduced by anti-interference weighting is compensated, it is ensured that follow-up capturing and tracking are not affected by the amplitude-phase distortion introduced by the anti-interference weighting, and the application scene requirements of self-adaptive zero-setting anti-interference and multi-beam anti-interference are met.

The invention provides an intelligent compensation method for a continuous variable quantum key distribution channel of a high-altitude platform, and relates to the technical field of quantum communication, and the method comprises the steps: obtaining a current light intensity distribution diagram of a to-be-compensated channel link, inputting the current light intensity distribution diagram into a constructed atmospheric turbulence phase prediction model, predicting phase distortion caused by turbulence in the to-be-compensated channel link to obtain a phase prediction result; and compensating the to-be-compensated channel link by using the phase prediction result. The network architecture of the atmospheric turbulence phase prediction model comprises an input layer, a feature extraction module, a small sample learning module, a dynamic optimization module and an output layer which are connected in sequence. According to the invention, the problem of poor correction precision in the traditional optical correction technology is effectively solved, and the efficiency and stability of the high-altitude platform CV-QKD channel are improved.

The invention relates to the technical field of audio processing, and discloses a voice recognition method and system based on a neural network, and the method comprises the steps: firstly obtaining a real-time audio stream of a target scene, extracting a time-frequency feature group, analyzing a pulse coding sequence, and constructing a voice network architecture; identifying an acoustic feature cluster by using the acoustic feature cluster, matching a preset framework hierarchical topological relation, and optimizing node weight to generate an adaptive mapping network; based on this, analyzing a sound source propagation path, identifying a multipath effect factor, calculating a frequency domain coupling coefficient, and performing hierarchical fusion to obtain a mixed feature tensor; querying a tensor adaptive response trajectory, extracting a phase distortion feature and a signal-to-noise ratio index, and calculating a signal-to-noise attenuation entropy; and finally, determining a robust recognition level, reconstructing a sound source acquisition dimension and formulating a sound recognition scheme. According to the invention, the voice recognition precision in a complex environment can be improved.

The invention discloses a light off-axis structured light digital holographic microscopy super-resolution imaging method based on a Kramers-Kronig relation. In a light off-axis structured light digital holographic microscopy system, structural illumination patterns with different angle directions and phase shift amounts are loaded on an object light beam to acquire a structural illumination hologram, and an unloaded reference light beam is acquired to acquire a reference light intensity graph; the structure illumination hologram is combined with the reference light intensity graph to calculate complex amplitude by utilizing a KK relation, phase distortion of the complex amplitude is compensated to obtain distortion-removed complex amplitude, a frequency spectrum separation matrix is constructed by combining information during acquisition to perform frequency spectrum separation on high and low frequency components in the complex amplitude, and finally frequency spectrum synthesis is performed to realize super-resolution object light reconstruction. According to the invention, high resolution improvement can be realized, the interference problem of zero-order item frequency spectrum of the hologram under the light off-axis condition is effectively solved, the noise is obviously reduced, the imaging quality is improved, and the method has important application value in the fields of biological tissue observation, microstructure measurement and the like.

The invention discloses a power supply detection device and a test method thereof, particularly relates to the field of power electronic control, and is used for solving the problems of high-frequency phase distortion and incapability of reflecting a stability boundary under a real load dynamic state in an open-loop state caused by introduction of additional impedance due to disconnection of a loop in an existing open-loop injection test method. A switching node voltage ripple signal is synchronously collected as a disturbance input signal and an output voltage feedback signal is synchronously collected as a response output signal in a power supply closed-loop state; performing time domain alignment on the two signals to generate a time correlation signal pair; fourier transform is carried out on the signal pair to extract open-loop transfer function characteristics; mapping the characteristics to an intersection phase angle of a Nyquist plane identification curve and a unit circle; generating a chaos distortion index based on the local curvature change characteristics of the Nyquist curve of the intersection neighborhood; and correcting the phase angle of the intersection point by using a chaotic distortion index, and outputting a loop stability evaluation conclusion according to a correction result, thereby realizing high-precision stability evaluation of uninterrupted closed-loop control.

The invention relates to the technical field of ultrasonic signal processing, in particular to an ultrasonic data processing method and system and electronic equipment, and the method comprises the steps: obtaining an original ultrasonic echo signal, and carrying out the time gain compensation, band-pass filtering and down-sampling preprocessing; extracting dynamic frequency dispersion characteristic parameters based on Coann class time-frequency distribution; constructing a depth self-adaptive phase compensation model, and correcting nonlinear phase distortion segment by segment; hilbert transform is adopted to extract an envelope, and after logarithmic compression and linear mapping are carried out, image reconstruction is completed by utilizing delay summation beam forming and an adaptive contrast enhancement algorithm. According to the method, the imaging definition is improved through cooperation of frequency dispersion modeling and phase correction, and the method has good depth adaptability and image visualization effect and is suitable for high-precision image acquisition requirements in scenes such as medical ultrasonic imaging and industrial nondestructive testing.

The invention relates to the technical field of satellite communication, and discloses an efficient encoding and decoding and distribution transmission method for satellite image data, which comprises the following steps of: acquiring satellite epoch parameters, estimating a downlink channel capacity sequence, decomposing the image data into a basic feature code stream and a background residual code stream, and distributing a transmission priority, and mapping the basic feature code stream to the most significant bit of the modulation symbol, mapping the background residual code stream to the least significant bit of the modulation symbol, and implementing nonlinear displacement stretching on the coordinate of the constellation point where the modulation symbol is located according to the carrier frequency shift change rate. A core semantic bit phase tolerance boundary is expanded by compressing a background data judgment space, high-fidelity transmission of key image features in a severe phase distortion environment is ensured, and the information transparent transmission capacity in a high-dynamic link is improved.

The invention discloses an audio signal phase adjustment method, device and equipment and a storage medium, and relates to the technical field of vehicle-mounted loudspeakers, and the method comprises the steps: carrying out the frequency division processing, delay compensation and equalizer adjustment of an input audio signal, and obtaining an initial processing signal; outputting the initial processing signal to a target loudspeaker, and measuring a current frequency response curve of the target loudspeaker; determining an all-pass filter coefficient and a maximum phase filter coefficient according to the frequency division point, the wave crest and the wave trough of the current frequency response curve; performing phase adjustment on the initial processing signal based on the all-pass filter coefficient or the maximum phase filter coefficient to obtain an adjusted audio signal; and outputting the audio signal to the target loudspeaker, and returning to the step of measuring the current frequency response curve of the target loudspeaker until the current frequency response curve meets a preset flatness requirement, thereby completing phase adjustment. Phase distortion at the frequency division point and the wave crest and the wave trough of the frequency response curve can be improved through phase adjustment, so that the frequency response curve of the loudspeaker is optimized.

The invention relates to the technical field of equipment calibration, and discloses a collaborative directional calibration method and system, electronic equipment and a storage medium, and the method comprises the steps: obtaining the circumferential strain distribution data of a drill rod, and extracting the amplitude-frequency characteristics of a dominant vibration mode and the phase offset of an associated coupling vibration mode; generating an amplitude compensation coefficient according to the amplitude-frequency characteristics, generating a time-varying phase compensation factor in combination with the phase offset, and generating a dynamic vibration compensation parameter based on vibration energy distribution dynamic weighted fusion; based on a pre-trained nonlinear phase distortion compensation model, inputting a dynamic vibration compensation parameter and then outputting a gyroscope angular velocity signal after phase correction; performing vibration interference frequency band suppression processing on the accelerometer signal, and outputting the processed accelerometer signal; and performing iterative optimization on the corrected angular velocity signal and the processed accelerometer signal, and outputting a directional calibration result in combination with filtering smoothing processing. According to the invention, high-precision cooperative calibration of the inertial sensor in a multi-mode mechanical vibration environment can be realized.

The invention relates to the technical field of light field regulation and control, and discloses a static phase distortion compensation system of a spatial light modulator, which comprises a polarization splitting prism arranged in the light emitting direction of a laser and used for adjusting a light beam emitted by the laser into linearly polarized light in the horizontal direction, the first quarter-wave plate adjusts the linearly polarized light into circularly polarized light and irradiates the circularly polarized light to the spatial light modulator; a second quarter-wave plate arranged in the light emitting direction of the spatial light modulator adjusts an emergent light beam of the spatial light modulator into linearly polarized light, and a linear polarizer performs polarization analysis on the emergent light beam of the second quarter-wave plate; the static phase error of the spatial light modulator is determined through the polarization direction included angle of the incident beam of the first quarter-wave plate and the emergent beam of the second quarter-wave plate, and the polarization direction included angle is determined through the Malus law relation of the incident light intensity and the transmission light intensity of the linear polarizer. The static phase distortion of the spatial light modulator is compensated by using the phase error, and the static phase distortion compensation cost is reduced.

The invention discloses a power amplifier for improving amplitude phase distortion, relates to the technical field of power amplifiers, and solves the technical problems that the improvement of the amplitude phase distortion of the power amplifier is limited, the gain is greatly reduced, and the performance of the power amplifier is influenced in the prior art. The power amplifier comprises a first-stage input matching circuit, a first-stage driving amplifier circuit, a first-stage inter-stage matching circuit, a second-stage power amplifier circuit, a second-stage output matching circuit and a linearization structure, the second-stage power amplifier circuit adopts a fully differential structure to suppress the output of a common-mode signal, and performs power output based on an A-type working state of a CASCODE structure; the linearization structure introduces a third harmonic signal of the power amplifier into the alternating current ground through a capacitor, prevents fundamental waves from flowing in, and adjusts the opening degree through an MOS tube. The CASCODE structure is connected with a linear structure, amplitude phase distortion is improved, the linearity of the circuit is improved, and gain reduction is little.

The application relates to the technical field of underwater communication and signal processing, and provides an anti-interference method for underwater power carrier communication, which comprises the following steps: acquiring a power carrier time-frequency signal received by an SRM and synchronously collecting a control instruction stream, wherein the power carrier time-frequency signal is an OFDM signal; determining a state perception weight matrix based on a relay action time window, wherein the relay action time window is determined based on the control instruction stream; determining a joint optimization problem provided with a phase distortion correction operator based on the power carrier time-frequency signal, the state perception weight matrix and a frequency domain confidence matrix in combination with a double-weighted robust principal component analysis algorithm, wherein the frequency domain confidence matrix is determined based on the high-frequency attenuation characteristics of an underwater umbilical cable; and solving the joint optimization problem based on a linearized alternating direction multiplier method to determine a target power carrier signal. The application solves the problem that reliable communication cannot be realized under the double constraints of strong interference and severe phase jitter in the related art.

The present invention discloses a Fourier-assisted phase-shift profile measurement method for dynamic scenes, comprising: S1, judging the motion state of an object according to a motion mask, and if it is a dynamic object, proceeding to step S2; S2, performing Fourier transform on the stripe distortion map of the dynamic object to obtain a corresponding frequency domain image; S3, filtering the frequency domain image obtained in step S2 using a bandpass filter with preset parameters to remove the DC component and obtain a filtered frequency domain image; S4, obtaining the maximum position of the filtered frequency domain image, and using the maximum position as the filter center, filtering the filtered frequency domain image again using a bandpass filter with preset parameters to obtain a baseband component; S5, performing inverse Fourier transform on the baseband component to obtain a complex image group, and calculating the complex image The wrapped phase is obtained by calculating the ratio of the imaginary and real components of the group; S6, the two projected fringe distortion images are respectively calculated by the Fourier transform profilometry of steps S2 to S5 to obtain the wrapped phase of each fringe distortion image; the wrapped phases of two adjacent fringe distortion images of each group are subtracted to obtain two groups of phase differences; S7, the two groups of phase differences are substituted into the standard N-step phase shift profilometry algorithm to compensate for the phase distortion caused by motion and obtain the compensated wrapped phase; and the uncompensated wrapped phase is substituted into the solution of the dual-frequency fringe order to solve the fringe order; S8, the fringe order obtained in step S7 is corrected for the fringe order; S9, the unwrapped phase is obtained using the fringe order corrected in step S8 and the wrapped phase after compensation in step S7 to obtain the dynamic point cloud.

This invention discloses a method for amplitude and phase distortion correction in ISAR broadband direct sampling receivers. First, an amplitude and phase distortion echo signal model for the ISAR broadband direct sampling receiver is constructed. Matched filtering is applied to the amplitude and phase distortion echo signal at a single scattering point, and a fitness function is constructed based on the matched filtering results. Then, the PSO algorithm is used to iteratively optimize the amplitude and phase distortion coefficient vector of the echo signal at each scattering point, obtaining an estimated vector of amplitude and phase distortion coefficients, thus obtaining the amplitude and phase distortion estimates for the echo signal at each discrete point. Finally, an amplitude and phase compensation factor is calculated based on the estimated amplitude and phase distortion values ​​of the echo signal at the discrete points. This factor is used to correct the amplitude and phase distortion echo signal at each discrete point in real time, obtaining the corrected echo signal at each discrete point. The corrected echo signals at each discrete point are then superimposed to obtain the final corrected echo signal. This method solves the problems of insufficient targeting and easy getting trapped in local optima in high-dimensional solutions, thus improving ISAR imaging performance.

The present invention relates to the field of communication equipment technology, and provides a multi-frequency phase shifter and a multi-frequency antenna. The multi-frequency phase shifter includes a cavity and a plurality of phase shifters. The plurality of phase shifters are arranged in the cavity and connected in sequence along the length of the cavity. Adjacent phase shifters are connected in sequence via a first pin board. The first pin board is composed of multiple layers of elastic conductive sheets stacked together, each layer of elastic conductive sheets corresponding to a signal transmission channel of a different frequency band, and adjacent elastic conductive sheets are staggered in the horizontal direction to form an electromagnetic shielding isolation structure. The contact surface between the phase shifter and the first pin board is provided with a groove. In the multi-frequency phase shifter and multi-frequency antenna provided by the present invention, the plurality of phase shifters are arranged in sequence along the length of the cavity. Adjacent phase shifters are connected via the first pin board. This shortens the length of a single phase shifter and facilitates processing. Furthermore, the deformation compensation of the elastic conductive sheets is combined with the impedance matching of the gradient medium to solve the phase distortion problem of high-frequency pin connections.

The present disclosure provides a sequential power amplifier that achieves phase distortion compensation using sequential operation. [Solution] The sequential power amplifier according to this disclosure comprises a main amplifier that performs signal amplification at a constant load regardless of the input level, and an auxiliary amplifier that performs signal amplification at high power output when the input level is above a predetermined level, and whose phase distortion characteristics are different from those of the main amplifier. The phase distortion characteristics of the main amplifier are inverse to those of the auxiliary amplifier.

A memory device may include memory cell array a clock circuit configured to generate a plurality of clock signals for access operations associated with the memory cell array. The clock circuit may include a ring oscillator circuit that is configured to equalize phase distortions of the plurality of clock signals.

Disclosed in the present invention is a high‑linearity, high‑power GaAs HBT power amplifier having a power detection function, characterized in that: the GaAs HBT power amplifier comprises a radio frequency path, a bias module and a power detection circuit. The radio frequency path is used to perform power amplification on a radio frequency signal, a negative feedback network is used to improve the stability and expand the bandwidth, and second harmonic suppression improves the overall linearity. The bias circuit is used to provide, to a three-stage amplification circuit, a bias voltage that dynamically changes along with an input power, so as to solve the problems of linearity degradation and current instability caused by a self-heating effect in a GaAs HBT transistor under high-power input, thereby mitigating amplitude-amplitude distortion and amplitude-phase distortion of the power amplifier. The power detection circuit is used to output a direct current voltage that is positively correlated with an output power, so as to achieve accurate control of the output power of the power amplifier. By fully integrating negative feedback, dynamic biasing and harmonic suppression techniques, the present invention effectively improves the overall linearity of the amplifier.

The invention belongs to the technical field of radio frequency integrated circuits, and discloses a stacked broadband radio frequency amplifier and a wireless transceiver circuit thereof, the stacked broadband radio frequency amplifier comprises an input impedance matching network, a first stacked amplification circuit, a second stacked amplification circuit and an output impedance matching network; the input end of the input impedance matching network serves as the input end of the stacked broadband radio-frequency amplifier and is connected with a radio-frequency signal input end, the output end of the input impedance matching network outputs a radio-frequency signal to the first stacked amplification circuit, and the input end of the first stacked amplification circuit receives the radio-frequency signal and then outputs a primary amplified radio-frequency signal. The first stack amplification circuit receives the primary amplification radio frequency signal and then further amplifies and outputs a secondary amplification radio frequency signal. The input end of the output impedance matching network receives the secondary amplification radio frequency signal and then outputs and obtains an amplified radio frequency signal. The amplifier is simple in structure and has excellent high-power output, low-phase distortion and wide temperature stability performance.

The invention discloses an indoor positioning method based on two-dimensional sparse array signals. The method comprises the following steps: firstly, deploying a pair of equipment carrying a commercial Wi-Fi network card (Intel 5300) indoors, and configuring and acquiring channel state information (CSI) under multi-time snapshots in a form of'single transmitting antenna + three receiving antennas'; secondly, inhibiting phase distortion in the CSI data by using a linear fitting preprocessing method; thirdly, partitioning the total CSI data according to time snapshots, and inputting the total CSI data into a two-dimensional sparse iteration covariance estimation algorithm to estimate a multipath signal angle-time delay parameter; and finally, through a clustering algorithm, locking direct path features and completing accurate positioning. According to the method, the number of array elements of the receiving array is virtually expanded by using the subcarriers, the bottleneck of limited physical array elements of commercial Wi-Fi equipment is broken through, the positioning precision is greatly improved, the deployment cost is low, the compatibility is high, and the method is suitable for indoor positioning and other scenes.

The present application relates to quantum key distribution, in particular to a satellite-ground continuous variable quantum key distribution system and method based on deep learning, a signal receiving and branching module receives multiplexed optical signals containing quantum signals and classical reference pulses from a satellite, and separates the quantum signals and classical reference pulses corresponding to a coherent detection and key generation module and an intensity measurement module; the intensity measurement module obtains a two-dimensional intensity distribution image of the classical reference pulses; a deep learning phase estimation module has a pre-trained deep learning model, takes the two-dimensional intensity distribution image as input, and outputs a two-dimensional phase correction value matrix with the same resolution as the input image; a phase modulation module performs real-time phase correction on the locally generated optical wavefront according to the two-dimensional phase correction value matrix to compensate for the phase distortion caused by atmospheric turbulence; the present application can effectively overcome the defect that it is difficult to accurately and real-time correct the phase distortion caused by atmospheric turbulence in the satellite-ground link.

The present invention relates to a signal design technique resistant to phase distortion and may provide a method of a transmitter, the aspect comprising the steps of: modulating a sequence of source bits to be transmitted to a receiver to generate a first block of symbols; inserting at least one pilot into the first symbol block to generate a second symbol block; performing cumulative linear coding on the second symbol block to generate a third symbol block; performing real phase conversion on the third symbol block to generate a first signal converted to a phase value; adding a cyclic prefix (CP) to the first signal to generate a second signal; and wirelessly transmitting the second signal to the receiver.