22 results about "Doppler processing" patented technology

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

The invention discloses a fan structure deformation monitoring method based on distributed millimeter-wave radars, and relates to the technical field of detection, and the method comprises the steps: arranging at least two millimeter-wave radar nodes at the bottom of a fan tower in a non-intrusive manner, and controlling the emission time sequence of each radar through a unified PWM trigger signal and a preset time delay matrix, co-frequency interference is eliminated, and multi-radar cooperative detection is ensured; performing distance-Doppler FFT processing on echo signals acquired by each radar node, generating local point cloud data in combination with incoherent accumulation and a constant false alarm detection algorithm, and converting polar coordinates into rectangular coordinates to form a three-dimensional point cloud model; performing iterative registration on the local point clouds of the multiple radar nodes based on an ICP algorithm, unifying the local point clouds to a global coordinate system of a fan tower footing, and fusing to generate a complete fan structure three-dimensional point cloud field; and calculating a point-to-point distance difference between the historical reference point cloud and the current point cloud, counting a mean value and a maximum value, and judging whether deformation early warning is triggered or not according to a preset threshold value.

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

The invention relates to a photonic radar system (100) and a method for operating a photonic radar system (100). The invention further relates to a central unit (10) and a method for operating the central unit (10). The invention relates to reducing the computational effort required for Doppler processing in sparsely distributed antenna apertures by incorporating uniform linear array (ULA) structures (70).

Described are techniques for interleaving range and Doppler radar processing. A data cube is memory accessed differently, from one look period to the next, which allows Doppler processing for a current look period to happen in parallel with range processing for a next look period. Range processing for a first look period writes to rows of the data cube; Doppler processing reads from and empties its columns. But before Doppler processing can finish, a second look period begins. Rather than re-writing to the rows, range processing in the second look period writes to the columns just emptied by the ongoing Doppler processing. Doppler processing for the first look period is allowed to finish by executing during processing idle times in the second period, e.g., in-between chirps. With better processor utilization, Doppler processing is afforded more time to do its complex operations, while keeping look periods as short as possible.

The invention discloses a millimeter wave radar array-based wind field fan blade integrated monitoring method, which comprises the following steps of: generating a point cloud observation result by performing range direction and Doppler processing on observation data acquired by a millimeter wave radar array at the top of a cabin, and constructing an echo energy time sequence in a fan blade area; and determining the sweep-over period of the fan blade through peak detection. A time slot control sequence is constructed, a fan blade occupation time period is used for point cloud reconstruction, and a non-shielding time period is used for wind measurement. In a fan blade point cloud reconstruction time slot, reconstructing a fan blade point cloud through methods of multi-channel signal synthesis, threshold detection, angle estimation and the like, and extracting blade state parameters; in a wind measurement time slot, a wind speed vector inversion model is established through multi-sight radial speed observation, and the wind speed and the wind direction are obtained by adopting a weighted fusion method. And fusing and outputting the fan blade state parameters and the wind field parameters in a unified coordinate system and a time axis. According to the method, additional wind measurement equipment is not needed, and integrated, continuous and high-reliability monitoring of the wind field and the fan blades is achieved.

The application discloses a kind of wind field wind blade integrated monitoring method based on millimeter wave radar array, comprising: by the observation data obtained by millimeter wave radar array on the top of cabin is carried out distance and doppler processing, generate point cloud observation result, and construct echo energy time sequence in wind blade area, determine wind blade sweep period by peak value detection.Construct time slot control sequence, wind blade occupation period is used for point cloud reconstruction, unobstructed period is used for wind measurement.In wind blade point cloud reconstruction time slot, reconstruct wind blade point cloud by multi-channel signal synthesis, threshold detection and angle estimation etc., and extract blade state parameter;In wind measurement time slot, by multi-view radial velocity observation, establish wind speed vector inversion model, and obtain wind speed and wind direction by using weighted fusion method.Wind blade state parameter and wind field parameter are fused and output under unified coordinate system and time axis.The method does not need additional wind measurement equipment, realizes the integration, continuity and high reliable monitoring of wind field and wind blade.

A method and apparatus for radar sensing in a disaggregated radio access network. The apparatus includes interface circuitry to receive data from a radio unit and processing circuitry to perform radar sensing processing on the received data to determine at least one of range, velocity, or direction of at least one target in an environment. The radar sensing processing includes range processing, Doppler processing, two-dimensional range-Doppler periodogram processing, constant false alarm rate (CFAR) detection processing, angular resolution processing, and post processing. The data received from the radio unit is beam domain data obtained by receive beamforming, and the processing circuitry is configured to perform decompression processing for converting the beam domain data to antenna domain data and perform at least the angular resolution processing and the post processing on the antenna domain data. The processing circuitry may perform the decompression processing after the CFAR detection processing.

A radar system that uses a range walk compensation algorithm to reduce system losses resulting from moving targets. During the coherent integration of pulse radar systems, the conventional Fast Fourier Transform (FFT) for Doppler processing needs to change the input range bin number in accordance to the velocity of the target. The algorithm allows for configuration of Doppler groups to compute several Dopplers with one FFT. Each Doppler group has a transform Doppler that is close to the center of the group which will dictate the change of range bins for the input data to the FFT. As the range bins are changed, there are two input filter techniques: nearest bin select, and 2-tap filter. After range walk compensation processes all Doppler groups by FFT, the resultant output block has much higher coherent integration as compared to just a conventional FFT.

The invention relates to the technical field of radar speed measurement, and discloses a radar speed measurement method based on gain control, comprising the following steps: S1, system initialization and gain calibration: pre-testing loop stability; s2, signal transmitting and echo receiving: transmitting and receiving a dynamic gain control echo signal; s3, high-speed signal acquisition and synchronization: acquiring I / Q channel data; s4, Doppler processing and dynamic gain compensation: Doppler frequency is extracted; s5, Doppler peak value detection and speed calculation: detecting a target peak value, and calculating a target speed; s6, dynamic performance verification: carrying out a multi-target scene test and an anti-interference test; s7, boundary condition robustness test: carrying out extreme environment test and overload recovery test; and S8, calibrating and outputting data. Through real-time gain compensation of digital automatic gain control and robust Doppler processing, high-precision speed measurement can still be realized under the conditions of strong clutter, interference and rapid gain change, the stability is good, and the influence of the environment is small.

The application discloses a kind of ultra-long baseline distributed radar transceiver local oscillator frequency calibration method and equipment, belong to radar detection technical field.The application includes: selecting the target of relative ultra-long baseline distributed radar stationary, through the echo Doppler processing of stationary target, extracts the local oscillator frequency difference of ultra-long baseline distributed radar, based on the local oscillator frequency difference of ultra-long baseline distributed radar, the compensation of other target echo signal is completed.The application can meet the local oscillator frequency calibration demand of ultra-long baseline distributed detection radar, reduce the influence of distributed radar local oscillator existing frequency difference on system detection performance, reduce the complexity of ultra-long baseline distributed detection system.

A technique for interleaved range and Doppler radar processing is described. The data cube's memory access differs from one view cycle to the next, allowing Doppler processing in the current view cycle to run concurrently with range processing in the next. Range processing in the first view cycle writes rows to the data cube; Doppler processing reads from and clears the columns of the data cube. However, the second view cycle begins before the Doppler processing can complete. Range processing in the second view cycle writes to the columns just cleared by the ongoing Doppler processing, instead of rewriting rows. This allows the Doppler processing of the first view cycle to complete by executing during processing idle times in the second cycle (e.g., between chirps). Through better processor utilization, Doppler processing can have more time to complete its complex operations while maintaining the shortest possible view cycles.

Systems and methods are provided and include a radar system that transmits radar signals within frames having radar chirps. The radar chirps have a stepped frequency waveform such that the initial and end frequencies are changed for subsequent chirps and have a constant pulse repetition period between chirps. The radar system performs range fast Fourier transform (FFT) processing and Doppler FFT processing on receive values corresponding to reflected signals from an object. The radar system estimates range and range-rate information about the object based on range FFT values and Doppler FFT values using a signal model and determines information about the object based on the estimated range and range-rate information. The signal model includes (1) a fast-time dimension term corresponding to samples within a radar chirp and (2) a slow-time dimension term corresponding to individual radar chirps within the frame, with the slow-time dimension term including a second degree term.

The invention discloses a multi-mode radar signal rapid implementation method based on GPU multi-stream processing, which is suitable for real-time signal processing of active, passive and active and passive mixed radar modes, and performs parallel processing on radar echo data through a GPU multi-stream processing mechanism by depending on GPU parallel computing capability and a cuFFT special acceleration library. The CPU host end constructs a circular queue and adopts multiple threads to realize in-dequeue non-interference parallel, and after UDP data receiving, frame verification and mode classification are completed, valid data are copied to a GPU video memory through a PCIE bus; the GPU side accelerates core algorithms of all modes in parallel through corresponding streams, active radar pulse compression, moving target detection, passive radar clutter cancellation, distance Doppler processing and the like are achieved respectively, two kinds of stream processing are started synchronously in the mixed mode, and finally a detection result is transmitted back to the CPU and displayed in real time through a UI interface. According to the method, the multi-mode radar signal processing efficiency is effectively improved, the problems of multi-mode data interference and processing delay are solved, and the real-time processing requirement is met.

The present application provides an ultrasonic time series data processing apparatus and a non-transitory storage medium. A Doppler processing section (18) or a beam data processing section (20) generates object time series data based on a received beam data string from a receiving section (16). An artifact prediction section (38) predicts a kind of artifact generated by the object time series data by inputting the object time series data to a learned artifact prediction learner (32). An artifact reduction section (40) performs artifact reduction processing based on the predicted kind of artifact. A display control section (24) notifies a user of a corrected ultrasonic image (62) on which the artifact reduction processing is performed or a prediction result of the artifact prediction section (38).

An ultrasound diagnosis apparatus according to an embodiment includes transmitter and receiver circuitry and Doppler processing circuitry. The transmitter and receiver circuitry is configured to transmit ultrasound and receive an echo signal corresponding to the ultrasound. The Doppler processing circuitry is configured to perform principal component analysis of a first signal data string obtained from the echo signal, and is configured to extract a second signal data string from the first signal data string by reducing a predetermined Doppler frequency component, on the basis of at least one of an eigenvalue and an eigenvector obtained by the principal component analysis.

An ultrasound diagnostic apparatus (1) includes a B-mode processing unit (6) that generates a B-mode image in which at least a blood vessel is imaged based on a reception signal obtained by transmitting and receiving ultrasonic waves to and from a subject; a display device (9) that displays the B-mode image; a vascular wall detection unit (10) that detects a vascular wall based on the B-mode image; a gate setting unit (11) that sets a Doppler gate in the blood vessel on the B-mode image; a Doppler processing unit (7) that acquires Doppler data in the Doppler gate; a blood flow velocity calculation unit (13) that calculates a blood flow velocity based on the Doppler data; and a blood flow rate measurement unit (12) that measures a blood flow rate based on the detected vascular wall and the calculated blood flow velocity, in which the blood flow rate is automatically measured based on a fixed start trigger.

The application discloses a flexible wearable heart ultrasonic imaging and blood flow dynamics continuous monitoring system which combines a flexible two-dimensional surface array and real-time deformation compensation beam synthesis based on echo signals, ensures the continuity and definition of images, and realizes quantitative Doppler blood flow measurement without manual intervention, repeatability and compliance with clinical diagnosis standards through the cooperative work of AI-driven standard cross-section electronic tracking locking and an optimized spectrum Doppler processing channel.

The invention discloses a laser radar signal generation method, a laser radar signal detection method and a laser radar signal detection system. The system comprises a transmitting end and a receiving end, the transmitting end comprises a transmitting end modulation module used for generating a first electric driving signal and a target modulation reference signal; the direct modulation module directly modulates the first electric driving signal to generate a calibration electric signal; the pre-distortion equalization module compares the calibration electric signal with the modulation reference signal to generate a second electric driving signal; the beam transmitting module adopts a second electric driving signal to drive a direct modulation laser to generate radar detection signal light to be transmitted; the receiving end comprises a beam receiving module used for receiving reflected signal light after the radar detection signal light is reflected by a target; the coherent detection module performs coherent mixing on the reflected signal light and the transmitted signal light to obtain an electric signal; the phase recovery module obtains a signal after phase recovery according to the electric signal; the distance analysis module estimates the distance of the target; the Doppler processing module estimates a relative velocity of the target.

This invention discloses a wind field detection method based on adjustable pulse waveform generation from meteorological millimeter-wave radar, comprising constructing a first transmitted waveform for near-ground low-altitude detection and a second transmitted waveform for mid-to-high-altitude detection, and loading different pulse waveforms respectively. m Sequence encoding forms a coded modulation waveform; within the same detection period, two types of coded waveforms are transmitted in a time-division manner based on a preset control strategy; target echo signals are received, and matched filtering is performed using the corresponding coded sequences to separate the waveform echoes; the separated echo data undergoes range grouping and Doppler processing to obtain radial velocity information at different altitudes; and the near-surface and mid-to-high-altitude detection results are fused based on the range distribution to generate a continuous vertical wind field profile. This invention improves the separability and anti-interference capability of echoes at different altitudes by combining time-domain scheduling with coding-domain differentiation, achieving coordinated unification of near-surface fine detection and mid-to-high-altitude long-range detection.