31 results about "Doppler measurements" patented technology

The invention belongs to the technical field of wireless communication, and particularly relates to a positioning method based on low-orbit satellite opportunity signal Doppler measurement. The method solves the Doppler measurement positioning problem based on low orbit (LEO) satellite opportunity signals under the condition that GNSS signals are limited or unavailable. A positioning process is modeled as a non-linear state space framework, a joint estimation scheme combining a cubic Kalman smoother and an expectation maximization algorithm is provided, efficient estimation of a terminal position and Doppler frequency shift is realized, and noise covariance is adaptively optimized at the same time. The method provided by the invention theoretically ensures the optimal performance in statistical significance. A simulation result shows that compared with a traditional nonlinear least square method, the scheme provided by the invention can remarkably improve the positioning precision, and the calculation overhead is kept reasonable and balanced.

The invention relates to the technical field of flow field measurement, in particular to an ocean flow field measurement method and device, and provides the following scheme: the method comprises the following steps: collecting ocean environment parameters through a vertical sensor, determining an overlook angle of an inclination sensor based on an optimization algorithm, and generating a virtual Doppler measurement array through micro-amplitude scanning; inputting to a chaotic oscillator network to identify a Lyapunov exponent maximum direction, and determining a horizontal included angle of a second inclination sensor; furthermore, a frequency shift signal is collected, and the flow velocity and the flow direction are calculated by combining adjusting parameters, so that high-precision and high-adaptability flow field measurement is realized; the method has a dynamic response capability, and is suitable for direction structure identification and real-time flow direction calculation under complex sea conditions.

A method of processing reference signals at an apparatus includes: obtaining, at the apparatus, a reference signal (RS) configuration corresponding to a set of pilots to be transmitted on a set of resource elements in at least one RS repetition of an allocated RS; and selectively processing, at the apparatus, only a subset of the set of resource elements, to process fewer than all resource elements of the set of resource elements, based on at least one Doppler / velocity RS measurement consideration corresponding to at least one of a Doppler RS measurement or a velocity RS measurement.

The invention provides a turbulent flow space statistical magnitude measuring method, which comprises the following steps of: acquiring a sampling signal for laser Doppler velocity measurement, processing, setting filtering and pre-signal amplification coefficient parameters, carrying out data enveloping and modulation, checking a calculation result, filtering again if the calculation result is unqualified after the calculation result is checked, and if the calculation result is not qualified after the calculation result is checked, judging whether the calculation result is qualified or not. If the inspection is qualified, outputting a result; determining a laser Doppler measurement volume diameter corresponding to the low-intensity steady turbulence by applying a Taylor freezing hypothesis, and performing Fourier transform by adopting a time slot auto-covariance method to draw a turbulence space kinetic energy spectrum density curve; second-order and third-order structure function curves of a turbulent space are drawn based on a convection recording method and a time slot auto-covariance method to be verified respectively, a turbulent average dissipation value is calculated according to the initial slope of a third-order structure function of the turbulent space, and then the dissipation scale is calculated according to the energy dissipation rate of fluid and the kinematic viscosity coefficient of the fluid. According to the measurement method, the measurement precision of the turbulence space is improved.

Various aspects of the present disclosure relate to measurements for sensing in a wireless network. An apparatus, such as a device implementing a measurement entity, receives first signaling including at least one configuration parameter corresponding to a set of doppler measurements associated with sensing one or more targets. The device receives second signaling including one or more reference signals associated with sensing the one or more targets. The device transmits, based on the at least one configuration parameter and the one or more reference signals, third signaling including sensing information of the one or more targets, where the sensing information is based on the set of doppler measurements.

The invention relates to an integrated navigation precision improvement method based on fused hydrological information, which belongs to the technical field of inertial navigation, and comprises the following steps: S1, based on hydrological information of a target navigation sea area, calculating to obtain a sound velocity profile of the target navigation sea area and wave beam angles of each water layer of the target navigation sea area; s2, based on the sound velocity profile of the target navigation sea area and each water layer beam angle, obtaining a corrected Doppler measurement speed; s3, compensating the corrected Doppler measurement speed based on the beam incident angle after equivalent refraction to obtain a compensated Doppler measurement speed; and S4, fusing the compensated Doppler measurement speed with the inertial navigation speed to obtain a corrected navigation calculation result of the ship or the underwater vehicle. According to the invention, the hydrological environment data and the inertial navigation data are fused, so that the position precision and reliability of the ship or the underwater vehicle during long-time autonomous navigation are greatly improved.

The application discloses a communication method, a communication device and a computer readable storage medium. The application is applied to a wireless local area network system supporting IEEE 802.11ax next generation Wi-Fi protocol, such as 802.11be, 802.15.4z, 802.15.4ab, Wi-Fi7 or EHT, for example, 802.11be next generation, Wi-Fi8 or 802.11 series protocol, and can also be applied to a wireless personal area network system based on ultra-wideband (UWB), a sensing system. The method comprises: generating a transmission signal, a peak value of a first sidelobe of the transmission signal belonging to a first peak value range; and transmitting the transmission signal, the transmission signal being used for ranging, angle measurement or Doppler measurement. In the embodiment of the application, the peak value of the first sidelobe of the transmission signal belongs to the first peak value range, so that the influence of the direct diameter of the transmission signal on the non-direct diameter can be reduced.

This invention belongs to the field of target tracking technology based on the fusion of multiple phased array radar data, and specifically relates to a target tracking system and method that utilizes Doppler measurement information for sequential filtering and fusion. A multi-radar sequential fusion target tracking method (SQ-AFSF) based on adaptive information feedback is proposed. In this algorithm, the DMM-LSF filtering algorithm is used, with the estimated result of the sequentially fused position filtering as the input for the sequential filtering. The filtering results of the sequential filtering are further sequentially fused to obtain the estimated result after sequential filtering. Finally, adaptive information feedback is performed according to the corresponding scenario to obtain the final target state estimation result.

This invention discloses a high-speed blood flow Doppler measurement method and system for miniaturized ultrasound catheter probes. It employs a high-pulse repetition frequency complementary Golay-coded pulse sequence to replace continuous wave transmission, achieving a distance-dimensional information-discarding equivalent CW effect through extremely high PRF combined with range-gate coherent summation. Pulse compression processing gain is obtained through Golay BPSK encoding excitation. A pulse-by-pulse A / B alternating transmission strategy is used, with each physical pulse independently extracting Doppler samples using a matched filter corresponding to the codeword. Time-division multiplexing of pulse modes enables full-aperture transmission and reception, eliminating TX-RX acoustic leakage. This invention achieves a comprehensive signal-to-noise ratio gain of approximately 31 dB without exceeding the thermal load of traditional CW, restoring clinically usable CW equivalent Doppler spectra on ICE catheters, and can be implemented through firmware upgrades on existing PW Doppler hardware.

The present invention discloses integrated sensing and communications (ISAC). A mechanism for calibrating sensing nodes in a mobile radio network is provided. A sensing transmitter transmits one or more reference signal sets, each set comprising at least two reference signals transmitted using a common spatial filter within a configured time period. A sensing receiver receives the one or more reference signal sets and performs sensing calibration, such as estimating path parameters based on the one or more reference signal sets to compensate for timing and / or frequency offsets. The present invention achieves bias-free delay and Doppler measurements, improved sensing accuracy, and scalable deployment in multi-node ISAC systems, addressing challenges in synchronization for multi-node sensing in next-generation wireless networks.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a wireless communication device may send an indication of micro-Doppler measurements associated with a first artificial intelligence or machine learning (AI / ML) model. The wireless communication device may receive an indication of a second AI / ML model in association with sending the indication of the micro-Doppler measurement, the second AI / ML model being an update to the first AI / ML model. The wireless communication device may transmit an indication associated with object identification in conjunction with using the second AI / ML model. Numerous other aspects are described.

A first cellular base station transmits a configuration message to a reporting device installed on a high-speed vehicle. The configuration message specifies one or more parameters of a Doppler measurement report. The reporting device performs one or more first Doppler measurements on the first base station and / or one or more second Doppler measurements on a second base station. The reporting device transmits the Doppler measurement report to the first and / or second base stations. The Doppler measurement report may be used by the first and / or second base stations to perform Doppler pre-compensation on transmissions to the reporting device.

The invention discloses a generalized Doppler effect measurement method and device, belongs to the technical field of photoelectric detection and motion sensing, and aims to solve the problem that the complete vector information of a moving target cannot be obtained at one time through single laser because the linear effect, the rotation effect and the vector effect are mutually independent in the existing laser Doppler measurement technology. The method comprises the following steps: generating and emitting a spin-dual orbital angular momentum coupling light field to a moving target; scattering signals are received and converted into time-domain electric signals after polarization analysis; performing spectrum analysis on the signal to obtain a generalized spectrum containing a traditional Doppler signal peak, a Doppler polarization signal peak and two Doppler polarization vortex signal peaks; calculating the frequency shift according to the spectrum peak position, and judging the motion direction according to the relative phase difference. The corresponding device comprises a narrow linewidth laser, a polarization modulation and coupling light field generation module, a 4F imaging system, a digital micromirror target simulation unit and a signal detection and analysis unit.

The invention discloses a spectrum Doppler measurement method and ultrasonic imaging equipment, and the method comprises the steps: setting a spectrum sampling region at a to-be-measured blood vessel structure of an ultrasonic image in a spectrum Doppler mode, and enabling ultrasonic echo data in the spectrum sampling region to comprise echo data from a plurality of receiving scanning lines; and performing spectral analysis on the ultrasonic echo data at the frequency spectrum sampling area to obtain a frequency spectrum image of the blood vessel structure to be detected more accurately.

The application particularly relates to a tight combination positioning method of a multi-epoch robust navigation system based on MSCKF, which comprises the following steps: receiving base station and rover station observations of a first navigation device, point cloud of a second navigation device and specific force and angular velocity of an inertial measurement unit; performing mechanical arrangement on a third navigation device by using the specific force and the angular velocity, then predicting a state vector and a covariance of the MSCKF, based on a prediction result, performing data preprocessing on the point cloud data by using prior pose of the third navigation device, performing multi-frame data association, and constructing a multi-state constraint second navigation device measurement model of the MSCKF; performing gross error detection and elimination on the first navigation device observation by using multi-epoch robustness, then constructing a pseudo-range and Doppler measurement model of the first navigation device, and performing measurement update on the state vector and the covariance of the MSCKF, and controlling the first navigation device, the second navigation device and the third navigation device to perform tight combination positioning according to an update result.

A MIMO radar system has a transmitting array with a plurality of transmitting antennas arranged at a distance from each other in an angle resolving direction, a receiving array with a plurality of receiving antennas arranged at a distance from each other in an angle resolving direction, an antenna spacing of one of the transmitting and receiving arrays being above the Nyquist limit for a single valued angle measurement, however an antenna spacing of the combination of the transmitting and receiving arrays being below the Nyquist limit, a control and analysis processing device configured for transmitting a transmitting signal by the transmitting array in each of a plurality of measurement periods implemented repeatedly according to a periodic multiplexing scheme, converting a signal received in a measurement period into a detection space of at least two dimensions, testing a plurality of hypotheses of a plurality valuedness against an estimate, selecting a hypothesis of the plurality valuedness with a highest quality measure for a single valued Doppler measurement, performing an independent angle estimation based on the transmitting and receiving array, merging results of the independent angle estimations into a single valued angle measurement.

A first cellular base station (102) transmits a configuration message to a reporting device installed on a high speed vehicle. The configuration message specifies one or more parameters of a Doppler measurement report. The reporting device performs one or more first Doppler measurements on the first base station (102) and / or one or more second Doppler measurements on a second base station (102). The reporting device transmits the Doppler measurement report to the first base station and / or the second base station (102). The first base station and / or the second base station (102) can use the Doppler measurement report to perform Doppler pre-compensation on transmissions to the reporting device.

The present invention relates to a central unit (Z) for a distributed radar system, which can be operated, for example, in a means of transport. The central unit (Z) is designed to provide a first transmission signal (S-C) in the form of a continuous sequence of chirp signals for a designated radar transmission unit, and to provide, in alternation, second transmission signals (S-I) in the form of an intermittent sequence of chirp signals for the rest of the radar transmission units. Multiple transmission frequencies, which differ from one another by a frequency swing, are used by the one designated radar transmission unit and the rest of the radar transmission units. The first radar echo signal (R-C) resulting from the first transmission signal (S-C) is evaluated for a Doppler measurement. The second radar echo signals (R-I) resulting from the second transmission signals (S-I) are used for detecting objects in the environment. The present invention also relates to a distributed radar system comprising such a central unit (Z). The invention also relates to a method and a computer program for operating such a central unit (Z) and to a means of transport which has a distributed radar system comprising such a central unit (Z).

The application provides a bidirectional prediction intelligent connection method and system for long-term interruption data of deep space narrowband Doppler measurement, which comprises the following steps: S1, channel decomposition and aggregation of bidirectional prediction data before and after interruption based on time-frequency domain multi-angle characteristics; S2, one-way data modeling and prediction based on multi-channel decomposition and aggregation; S3, variable weight fusion of bidirectional prediction data based on confidence interval and frequency domain decomposition; and S4, polynomial fitting and prediction curve smoothing of integrated data. The application performs adaptive decomposition and channel aggregation on the data segments before and after long-term interruption of deep space exploration based on the characteristics of the data segments, and respectively performs modeling and prediction on the channel data from the positive direction and the reverse direction, and performs data fusion and trend smoothing under the guidance of the confidence interval, so that the interpolation accuracy is significantly higher than that of the traditional one-way extrapolation fitting method, and the application has good generality and stability, especially in the long-term deep space data interruption state.

Disclosed are techniques for radio frequency (RF) sensing. In an aspect, a user equipment (UE) may send, to a network entity, information indicating Doppler reporting capability. The UE may receive, from the network entity, a Doppler reporting request. The UE may determine Doppler measurement parameters and Doppler reporting parameters to be used based on the Doppler reporting capability and the Doppler reporting request. The UE may calculate a Doppler estimate of a received signal according to the Doppler measurement parameters. The UE may report the Doppler estimate to the network entity according to the Doppler reporting parameters.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a reference signal (RS) on a RS resource via a hybrid reconfigurable intelligent surface (H-RIS) relay link. The network entity may configure the H-RIS to perform Doppler measurements on the RS. The H-RIS may then compensate for Doppler effects on the relay link based on Doppler measurements. For example, a network entity may indicate RS resources to an H-RIS, which may indicate the H-RIS to compensate for Doppler effects on a relay link between the network entity and a UE according to previously measured Doppler effects. In some cases, the network entity may indicate other RS resources to the H-RIS and to other UEs in the wireless communication system, and the H-RIS may measure and compensate for Doppler effects on other relay links corresponding to the other UEs.

In some implementations, one or more devices may obtain epoch measurement information indicating pseudo-range measurements, carrier phase measurements, and Doppler measurements performed by a reference global navigation satellite system (GNSS) receiver on radio frequency (RF) signals transmitted by a plurality of GNSS satellites. The device (s) may obtain initial state space representation (SSR) data, including track correction, clock correction, and code bias information for the epoch. The device (s) may determine ionosphere correction data for the epoch based on measurement information and initial SSR data. The device (s) may determine troposphere correction data for the epoch based on the determined ionosphere correction data, measurement information, and initial SSR data. The device (s) may provide extended SSR data, where the extended SSR data includes ionosphere correction data and troposphere correction data.

The application discloses a target motion parameter estimation method and system based on a bistatic Doppler time-frequency curve; a plane rectangular coordinate system is established with a receiver position as an origin, a transmitter position is a known fixed coordinate, and a target is assumed to be a uniform linear motion; according to analytical expressions of distances between the transmitter and the target and between the receiver and the target, a bistatic equivalent path length is constructed, and an analytical expression of Doppler variation with time is derived based on a Doppler physical model; a target Doppler time-frequency curve is sampled at multiple time points to obtain a Doppler measurement vector, and outputs of the analytical model at corresponding time points are combined to form a model vector, so that an observation equation with target motion parameters as unknown quantities is formed; and a nonlinear least square algorithm is used to estimate the target motion parameters. The application has the advantages of not needing distance measurement, complete theoretical basis, high estimation precision and easy engineering implementation, and can be used for multi-station radar target trajectory matching and information fusion.

The invention discloses a laser vibration measurement analysis method based on an autocorrelation algorithm, and belongs to the technical field of laser high-precision detection. According to the method, the structure of a laser Doppler measurement system is optimized, and a typical phase modulation signal is generated by simultaneously driving an acousto-optic frequency shifter through a trigger signal and mixing the acousto-optic frequency shifter with a photocurrent signal after AD sampling. The phase change frequency of a modulation signal is directly analyzed by using an autocorrelation algorithm, the target vibration frequency is obtained, and complex processes such as orthogonal carrier generation, phase unwrapping and FFT transformation in a traditional method are avoided. In order to solve the problem that self-correlation may only demodulate even harmonics, a delay comparison step is introduced to ensure the uniformity of odd-even harmonic identification. According to the invention, the working process of the system is obviously simplified, the realization difficulty and cost of the laser Doppler vibration measurement technology are reduced, and the analysis efficiency and robustness are improved.

The application relates to the technical field of flow field measurement, in particular to a marine flow field measurement method and device, and the following scheme is provided: a vertical sensor is used to collect marine environment parameters, an optimal algorithm is used to determine the horizontal angle of a tilt sensor, a virtual Doppler measurement array is generated by using micro-scan, and the virtual Doppler measurement array is input into a chaotic oscillator network to identify the maximum direction of Lyapunov exponent and determine the horizontal angle of a second tilt sensor; then, a frequency shift signal is collected, and the flow velocity and flow direction are calculated by combining adjustment parameters, so that high-precision and high-adaptability flow field measurement is realized; and the application has dynamic response capability and is suitable for direction structure identification and real-time flow direction calculation under complex sea conditions.

The present application relates to a kind of based on the combination navigation precision promotion method of fusion hydrological information, belong to inertial navigation technical field, comprising the following steps: S1, based on the hydrological information of target navigation sea area, the sound speed profile of target navigation sea area and its each water layer beam angle are calculated;S2, based on the sound speed profile of the target navigation sea area and each water layer beam angle, obtain corrected doppler measurement speed;S3, based on the equivalent refraction after beam incidence angle, the compensated doppler measurement speed after the corrected doppler measurement speed is compensated;S4, the compensated doppler measurement speed and inertial navigation speed are fused, and the corrected ship or underwater vehicle navigation solution result is obtained.The present application fuses hydrological environment data and inertial navigation data, and the position accuracy and reliability of ship or underwater vehicle in long time autonomous navigation are greatly improved.

An apparatus, a method, and a computer program product for object detection are provided. An example method may include receiving, from a second wireless device, a first sensing combination configuration for combining a first set of micro-Doppler measurements based on a first set of sensing resources. The example method may also include transmitting, to a second wireless device, a first metric associated with a combination of the first set of micro-Doppler measurements based on the first set of sensing resources.

The scheme provides a complex ocean current state three-dimensional flow field reconstruction method and device based on a multi-beam acoustic Doppler measurement principle, comprising: obtaining an echo data set of a target reconstruction area at a current time based on a sampling strategy; obtaining an initial three-dimensional flow field by inversion based on the echo data set; constructing a physical constraint target function composed of an observation consistency index term, a continuity constraint term, a smoothing constraint term, a boundary condition constraint term, and an initial value maintaining term, and iteratively optimizing the initial three-dimensional flow field to minimize the physical constraint target function as an optimization target to obtain a final three-dimensional flow field; and calculating a comprehensive scheduling function and dynamically adjusting the sampling strategy at the next time in combination with the comprehensive scheduling function. The scheme constructs a physical constraint target function that integrates continuity, smoothing degree, and boundary conditions to iteratively optimize the initial inversion result, so that the three-dimensional flow field meets the physical constraint and boundary constraint, and the physical rationality of the three-dimensional flow field is improved.

The present invention relates to a central unit (Z) for a distributed radar system, which can be operated, for example, in a means of transportation. The central unit (Z) is configured to provide a first transmit signal (SC) in the form of a continuous sequence of chirp signals to a designated radar transmitter unit, and to provide second transmit signals (SI) alternately in the form of an intermittent sequence of chirp signals to the other radar transmitter units. The chirp signals of the first transmit signal (SC) and the chirp signals of the second transmit signals (SI) have the same signal waveform but different modulation times. The chirp signals of the first transmit signal (SC) are also transmitted during pauses between the chirp signals of the second transmit signals (SI). The first radar echo signal (RC) resulting from the first transmit signal (SC) is evaluated for a Doppler measurement.The second radar echo signals (RI) resulting from the second transmitted signals (SI) are used for detecting objects in the surrounding area. The present invention further relates to a distributed radar system with such a central unit (Z), as well as a transmitting module and a receiving module for a distributed radar system. The invention also relates to a method and a computer program for operating such a central unit (Z), as well as a means of transport comprising a distributed radar system with such a central unit (Z).

A method for locating a ground-based device using only one non-geostationary satellite, wherein Doppler measurements are extracted from received signals, and a plurality of computing iterations are performed, each computing iteration including defining a new geographical window having an area different from an area of a directly preceding geographical window, simulating Doppler curves for a plurality of positions inside the defined geographical window, training a machine learning model with the simulated Doppler curves associated with their position of emission, and obtaining a location of the ground-based device by inputting in the trained model the extracted Doppler measurements.