11 results about "Pulsed doppler" patented technology

The application discloses a dual-channel parallel detection airborne phased array radar ground moving target extraction method, comprising the following steps: acquiring coherent pulse train data of an airborne phased array radar; forming sum-difference beam data according to preset sum-difference beam weighting coefficients; constructing a pulse compression matching function to perform pulse compression on the sum-difference beam data; performing platform motion compensation and pulse Doppler processing on the pulse compressed sum-difference beam data; performing high-speed channel determination according to amplitude statistical results of each Doppler unit of the sum beam, and performing CFAR detection; performing low-speed channel determination according to the amplitude statistical results of each Doppler unit of the sum beam, processing low-speed channel data by using sum-difference 3DT-STAP algorithm, and performing CFAR detection and amplitude normalization processing on the processed data; merging the CFAR detection results of the high-speed channel data and the CFAR detection and amplitude normalization processing results of the low-speed channel data, and extracting a point track.

The invention relates to a brain small vessel blood flow monitoring method and system based on ultrasonic imaging, and the method comprises the steps: setting pulse Doppler ultrasonic imaging devices at different positions, and carrying out the color pulse Doppler imaging of the artery and vein in a brain small vessel through the pulse Doppler ultrasonic imaging devices, arranging according to spatial positions corresponding to different positions to obtain three-dimensional color pulse Doppler imaging; in the process of color pulse Doppler imaging, comparing and analyzing a current frame of color pulse Doppler image and a previous frame of color pulse Doppler image to obtain an analysis result for optimizing a subsequent color pulse Doppler image; blood flow power information is extracted from the three-dimensional color pulse Doppler imaging, and the blood flow change condition of the small cerebral vessels is obtained based on the blood flow power information. The brain small vessel blood flow monitoring system can realize real-time and dynamic monitoring of brain small vessel blood flow, has high clinical application value, and provides a new technical means for prevention and treatment work of brain small vessel diseases.

The invention relates to the related technical field of signal processing, in particular to a signal processing method and system for a radar life detector, and the method comprises the steps: collecting a radar detection signal, and configuring a parameter judgment reference; evaluating the analysis feasibility of the pulse Doppler radar signal, and determining a local detection sub-region under the echo signal intensity distribution mark; and adjusting the sampling frequency and the detection coverage of the signal processing unit, and generating a detection report. The technical problems that signals are processed at a fixed sampling frequency and a detection range, blind analysis is still performed when the effective analysis probability of the signals is low, local signals are easily ignored under a complex terrain, and the detection reliability is difficult to guarantee are solved, an effective analysis probability evaluation mechanism is introduced, only high-probability analyzable signals are deeply processed, local detection sub-regions are locked, and the detection reliability is ensured. The technical effects of synchronously adjusting the sampling frequency and the detection coverage range, eliminating a detection blind area under a complex terrain, performing registration correction on radar scanning surface data and discrete point data, and ensuring the detection reliability are achieved.

The invention belongs to the technical field of radar height measurement, and particularly discloses an inter-pulse phase modulation radar height measurement method based on range ambiguity. The method comprises the following steps: a transmitting branch of a pulse Doppler radar altimeter transmits a pulse signal; a receiving branch of the pulse Doppler radar altimeter receives the echo signal; obtaining an echo signal after the range gate is gated, and determining a demodulation code corresponding to the range gate; and carrying out decoding identification on the echo signal of the target distance received at the distance door according to the demodulation code. According to the scheme, the technical problem of fuzzy ranging of the pulse Doppler system radar altimeter is solved.

The present disclosure provides a kind of water flow rate and silt thickness measurement method, device, equipment and medium based on pulse Doppler, it is related to fluid measurement and pipeline monitoring technical field.The method comprises: obtaining Doppler echo signal and ultrasonic echo signal;Based on the Doppler frequency deviation information corresponding to the scattering echo signal of different water layers in Doppler echo signal, the water flow rate of different water layers in pipeline is determined;Based on the attenuation echo signal of silt layer in Doppler echo signal, the water body height between water surface and the interface between water body and silt in pipeline is determined;Based on ultrasonic echo signal, the liquid level height between water surface and pipeline bottom in pipeline is determined;Based on liquid level height and water body height, the thickness of silt layer in pipeline is determined.Thereby, the measurement efficiency and measurement accuracy of water flow rate and silt thickness can be improved.

The invention discloses an ultrasonic spectrum Doppler signal reconstruction method and device and imaging equipment. The method aims to solve the problem of intermittent lack of pulse Doppler signals caused by B-mode scanning insertion in an ultrasonic duplex mode. The method comprises the following core steps: firstly, continuously collecting a section of pulse Doppler signal, and learning a patient specific dynamic coefficient by using a sparse autoregression model; then during duplex operation, high-precision interpolation compensation is carried out on a signal containing a missing point by using the coefficient; constructing a pseudo-random observation matrix based on a Poisson disk sampling criterion, and sampling the interpolated signal; and finally, combining the observation data and introducing an interpolation signal as a priori, and reconstructing a complete time domain signal through a compressed sensing algorithm. The method can adapt to physiological features of different patients, while the real-time performance is guaranteed, the accuracy and continuity of spectrum reconstruction are remarkably improved, artifacts are effectively eliminated, and more reliable hemodynamic information is provided for clinical diagnosis.

The application particularly relates to a pulse Doppler echo simulation method of a rotor unmanned aerial vehicle, which comprises the following steps: equivalent to a machine body as an isotropic scattering point, simulating a radar echo signal of the machine body based on an RCS of the machine body scattering point and a distance between the radar and a machine body gravity center; equivalent to rotor blades as a group of uniformly distributed isotropic scattering points on straight lines, simulating a radar echo signal of the rotor scattering points based on an RCS of the rotor scattering points and a distance between the rotor scattering points and the machine body gravity center; simulating a radar echo signal of a single blade based on the radar echo signal of the rotor scattering points, simulating a radar echo signal of a single rotor based on the radar echo signal of the single blade, simulating a radar echo signal of all rotors based on the radar echo signal of the single rotor; and simulating a pulse Doppler echo signal of the rotor unmanned aerial vehicle based on the radar echo signal of all rotors, the radar echo signal of the machine body and an echo signal noise. The method more truly simulates a radar echo characteristic of the rotor unmanned aerial vehicle.

This specification discloses a filtering method and system for ultrasound imaging. The method includes: acquiring multiple pulse Doppler echo signals, with adjacent pulse Doppler echo signals distributed at intervals in the time domain; demodulating the multiple pulse Doppler echo signals to generate discontinuous multi-segment IQ data; for each segment of IQ data: filtering at least a portion of the data points; and recursively filtering the filtered data points and the unfiltered data points to obtain segmented filtered IQ data.

The embodiment of the invention provides a pulse Doppler filling data determination method and device and electronic equipment. The method comprises the following steps: acquiring reference Doppler data before and / or after a to-be-filled time period, wherein the reference Doppler data is obtained through scanning of Doppler ultrasonic equipment; performing spectrum analysis on the reference Doppler data to obtain corresponding reference spectrum information; and predicting Doppler data to be filled in the time period to be filled based on the reference frequency spectrum information to obtain target Doppler data, target frequency spectrum information corresponding to the target Doppler data being determined based on the reference frequency spectrum information. The target Doppler data obtained through prediction by the scheme is relatively accurate, and the scheme is relatively small in calculation amount and can be suitable for an application scene of real-time scanning.

The application belongs to the technical field of short-range radar signal processing, and provides a pulse Doppler short-range radar signal processing simulation method based on a multi-scattering point model. The application simulates and realizes the working process of the pulse Doppler short-range radar under the condition that a short-range body target is locally irradiated by a radar, and uses a multi-scattering point structure to approximately construct a body target scattering source model capable of generating a return signal. The return signal of the part of the rigid body target irradiated by the transmitted signal is calculated, the return signals in the same range gate are superimposed to form the overall return signal of the body target, the return signal containing noise is demodulated and filtered, and then the frequency domain constant false alarm detection and the time domain threshold detection are used for target detection, so that the target starting point information is obtained. The technical scheme provided by the application can guarantee the influence of the target surface details on the effective return signal amplitude, and can also consider the calculation efficiency of the short-range radar signal simulation and the target starting point information.

The application relates to an ultrasonic imaging method, an ultrasonic imaging device, an ultrasonic imaging equipment and a storage medium. The method comprises the following steps: encoding original transmission pulses of each array element according to a preset encoding mode, and transmitting the encoded transmission pulses to a target region; receiving echo signals of the target region through each array element, and extracting clutter signals from the echo signals according to a decoding mode corresponding to the encoding mode to obtain denoised echo signals; and performing ultrasonic imaging on the denoised echo signals to obtain a pulse Doppler image of the target region. The method can improve the accuracy of the obtained pulse Doppler image of the target region.