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33 results about "Continuous wave doppler" patented technology
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Continuous wave Doppler ultrasound. a technique in which the transducer emits and receives the ultrasound beam continuously, enabling the measurement of high velocity blood flow, such as occurs through heart valve stenoses.
Medical diagnostic ultrasound instrument with ECG module, authorization mechanism and methods of use
InactiveUS6962566B2Restricts modificationImprove distributionElectrocardiographyBlood flow measurement devicesDiagnostic modalitiesColor doppler
A handheld ultrasound instrument is disclosed having enhanced diagnostic modes including pulse / continuous wave Doppler, time-motion analysis, spectral analysis and tissue harmonic imaging. An external electrocardiograph (ECG) recording unit is also disclosed. The ECG unit is adaptable to be used with the handheld ultrasound instrument to provide for ECG monitoring while performing an ultrasound scan in B-mode, Doppler, color Doppler, M-mode, and CW / PW mode. The enhanced handheld ultrasound instrument further includes a security mechanism allowing any combination of the diagnostic modes to be enabled by the manufacturer, and later to enable or disable any one or group of the diagnostic modes. The invention also discloses a method for a manufacturer to maintain a database of handheld ultrasound instrument capabilities after the instruments enter the stream of commerce.
Owner:FUJIFILM SONOSITE
Combined blood flow and pressure monitoring system and method
ActiveUS20150351703A1Improved cardiovascular measurementImproved monitoring systemCatheterAngiographyContinuous wave dopplerPressure measurement
A method of blood flow monitoring for a patient, the method comprising the steps of: a) receiving a first signal indicative of the real time cardiac output for the patient; b) processing the continuous wave Doppler signal to provide an estimate of blood flow velocity as a function of time; c) receiving a pressure measurement indicative of the blood flow resistance through the patient; and d) calculating an Inotropy measure indicative of the potential and kinetic energy of the cardiac output of the patient.
Owner:USCOM
Medical diagnostic ultrasound instrument with ECG module, authorization mechanism and methods of use
InactiveUS20060025684A1Restricts modificationRestricts replacementElectrocardiographyBlood flow measurement devicesDiagnostic modalitiesColor doppler
Owner:FUJIFILM SONOSITE
Fully-coherent continuous-wave Doppler radar and distance measurement and velocity measurement method thereof
ActiveCN106405541AWith no distance blind spot rangingEliminate the effects ofRadio wave reradiation/reflectionBlind zoneFree distance
The invention discloses a fully-coherent continuous-wave Doppler radar and a distance measurement and velocity measurement method thereof. According to the fully-coherent continuous-wave Doppler radar and the distance measurement and speed measurement method thereof, difference-frequency complex signals obtained by mixing echo signals and transmitted signals are acquired; according to the modulation characteristics of distance difference-Doppler frequency and target distance-velocity, a distance-dimension FFT and azimuth-dimension MTD-combined two-dimensional joint detection method is adopted to independently obtain fuzziness-free radial velocity information based on a plurality of coherent high-repetition frequency modulation signals; Doppler information introduced by velocity is removed from the frequency-domain information in the distance dimension, so that the influence of distance-velocity coupling can be eliminated, and therefore, accurate distance information can be obtained. The fully-coherent continuous-wave Doppler radar and the distance measurement and velocity measurement method thereof of the invention have coherent radar velocity measurement function and a continuous-wave radar distance blind zone-free distance measurement function and can satisfy requirements for distance blind zone-free and simultaneous distance measurement and velocity measurement, real-time performance, miniaturization and low power consumption.
Owner:SUZHOU TUSHI ELECTRONICS TECH CO LTD
Heartbeat frequency detection algorithm of non-contact vital sign detection system
InactiveCN105232026AEfficient extractionAccurate heart rate informationDiagnostic recording/measuringSensorsHuman bodyBandpass filtering
The invention provides a heartbeat frequency detection algorithm of a non-contact vital sign detection system; the steps are: respectively doing bandpass filtering for I and Q two way signals outputted by a continuous wave doppler radar; using a center estimate algorithm to carry out useful dc component recovery; using a complete cluster experience modal decomposition algorithm to separate a heartbeat signal from a human body jitter signal, a breathing signal and environment interference noises; resolving a Hilbert marginal spectrum of each decomposition signal and doing peak value detection; finding out the Hilbert marginal spectrum corresponding to the heartbeat signal according to a marginal spectrum peak position and energy concentration degree close to the spectrum peak; obtaining heartbeat frequency information according to the spectrum peak position. The heartbeat frequency detection algorithm can effectively extract the heartbeat signal under unstable human body and large environment interference noises, thus obtaining accurate heartbeat frequency information, improving anti-interference property of the non-contact vital sign detection system, and satisfying heartbeat frequency detection accuracy demands of medical affairs personnel.
Owner:WUXI NANLIGONG TECH DEV
Poly-phase code radar signal waveform automatic identification method based on continuous wave Doppler (CWD) feature
InactiveCN103064063ARealize identificationImprove accuracyWave based measurement systemsPhase CodePeak value
The invention relates to a poly-phase code radar signal waveform automatic identification method based on continuous wave Doppler (CWD) feature and belongs to the technical field of information countermeasures. According to the poly-phase code radar signal waveform automatic identification method based on CWD feature, a discrete sampling type Choi-Williams conversion is used as a basic tool, a CWD image of poly-phase code pulse compression radar signal is used as a feature extraction object, a Pseudo-Zernike moment of the CWD image, a target number of an image, a time position of a peak power in a CWD and a poly-phase code waveform symmetrical property are taken as features to identify a poly-phase code pulse compression radar waveform, and a neural network which is composed of 10 perceptrons and stops in advance of overall average is set up for automatic waveform identification. The poly-phase code radar signal waveform automatic identification method based on CWD feature has the advantages that the identification precision of the poly-phase code radar signal waveform is improved, the requirement of a signal to noise ratio is further decreased, and a new way can be developed for the design of radar signal identification and sorting by popularized and used in a poly-phase code continuous wave radar signal.
Owner:NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
Shape based similarity of continuous wave doppler images
Continuous wave Doppler images in a data base comprising cardiac echo studies are processed to separate Doppler frames. The frames are pre-processed to extract envelope curves and their corner shape features. Shape patterns in Doppler images from echo studies of patients with known cardiac (valvular) diseases are employed to infer the similarity in valvular disease labels for purposes of automated clinical decision support. Specifically, similarity in appearance of Doppler images from the same disease class is modeled as a constrained non-rigid translation transform of velocity envelopes embedded in these images. Shape similarity between two Doppler images is then judged by recovering the alignment transform using a variant of dynamic shape warping. Since different diseases appear as characteristic shape patterns in Doppler images, measuring the similarity in the shape pattern conveyed within the velocity region of two Doppler images can infer the similarity in their diagnosis labels.
Owner:IBM CORP
Implantable doppler blood flow monitor and doppler probe
InactiveUS20130116575A1Avoid problemsEasy to disassembleBlood flow measurement devicesCatheterBlood vesselDoppler flow
A Doppler blood flow monitoring system comprises a sensor cuff capable of being secured around an exterior surface of a patient's vessel, at least one transducer attached to the sensor cuff for generating signals into the vessel and for receiving said signals, and a transmitter in communication with the at least one transducer and capable of wirelessly transmitting an RF signal external to the patient's body. The system also comprises a receiver capable of receiving the RF signal from the transmitter and being capable of generating an audible sound or signal commensurate with detected flow. The system can take advantage of pulse wave or continuous wave Doppler technology.
Owner:UNIVERSITY OF PITTSBURGH
Object motion identification method based on multi-channel continuous-wave Doppler radar
ActiveCN106405520ASolving Phase Blur ProblemsImprove recognition accuracyWave based measurement systemsObject motionContinuous wave doppler
The present invention provides an object motion identification method based on a multi-channel continuous-wave Doppler radar. One antenna is employed to emit electromagnetic wave to irradiate the surface of a motion object to be measured, the reflected signals are received by 2-3 receiving antennas and are subjected to down conversion to a base band, the arcsine algorithm is employed to demodulate the phase information without the phase ambiguity limitation, the distance changing information between each receiving antenna and the motion object is obtained, the track formula is employed to obtain the object's motion track, and the mode identification is performed on the basis of the motion track. The object motion identification method based on the multi-channel continuous-wave Doppler radar can avoid the phase ambiguity problem of the arc tangent class function, is applied to the work condition with high the sampling rate and work condition with the low sampling rate and keeps the accuracy in the condition with the low sampling rate. The mode identification is realized on the basis of location and tracking of the object to be measured. The identification accuracy is high, the anti-interference capability is high, the configuration is simple, and the cost is low, the most of the demodulated motions are the linear relation with no need for the complex data processing process, and the hardware resource is saved.
Owner:ZHEJIANG UNIV
Liquid surface tension testing method based on mechanical vibration of liquid droplet
ActiveCN108318384AReduce dosageGood value for moneySurface tension analysisFrequency measurementsUltrasound doppler
The invention relates to a liquid surface tension testing method based on mechanical vibration of a liquid droplet. The method specifically comprises the following steps: placing a hydrophobic substrate on a Doppler ultrasonic probe, and generating a liquid droplet on the hydrophobic substrate; vibrating a triggering device to freely vibrate the liquid droplet; converting free vibration of capillary waves on the surface of the liquid droplet into an ultrasonic Doppler frequency shift signal through the ultrasonic probe by using a non-focusing continuous wave Doppler method, and amplifying theultrasonic Doppler frequency shift signal; acquiring a free vibration characteristic diagram of the liquid droplet from the ultrasonic Doppler frequency shift signal by using a computer signal processing module, performing Fourier transform so as to obtain a vibration frequency characteristic diagram, analyzing the vibration frequency characteristic diagram, and reading frequency of a second harmonic generation peak; by taking the reciprocal of the mass of the liquid droplet as a transverse coordinate, and the square of the frequency of the second harmonic generation peak as a longitudinal coordinate, drawing diagrams, fitting straight lines, calculating a straight slope, and further calculating the surface tension of the liquid droplet. The method based on ultrasonic Doppler frequency shifting is capable of carrying out frequency measurement on ultrasonic signals, and has the advantages of reagent conservation, high performance cost ratios and portability.
Owner:TONGJI UNIV
Shape based similarity of continuous wave doppler images
Continuous wave Doppler images in a data base comprising cardiac echo studies are processed to separate Doppler frames. The frames are pre-processed to extract envelope curves and their corner shape features. Shape patterns in Doppler images from echo studies of patients with known cardiac (valvular) diseases are employed to infer the similarity in valvular disease labels for purposes of automated clinical decision support. Specifically, similarity in appearance of Doppler images from the same disease class is modeled as a constrained non-rigid translation transform of velocity envelopes embedded in these images. Shape similarity between two Doppler images is then judged by recovering the alignment transform using a variant of dynamic shape warping. Since different diseases appear as characteristic shape patterns in Doppler images, measuring the similarity in the shape pattern conveyed within the velocity region of two Doppler images can infer the similarity in their diagnosis labels.
Owner:INT BUSINESS MASCH CORP
Liquid viscosity test method based on liquid drop mechanical vibration
The invention relates to a liquid viscosity test method based on liquid drop mechanical vibration. The method concretely comprises the following steps that a hydrophobic substrate is placed on a ultrasonic probe of a Doppler ultrasonic instrument; liquid drops are generated on the hydrophobic substrate through a microinjector; the liquid drops are vibrated through a vibration triggering device with an automatic rebounding function; then, the vibration triggering device rebounds; the liquid drops generate free vibration; the free vibration of liquid drop surface capillary waves is converted into ultrasonic wave Doppler frequency shift signals by a non-focusing continuous wave Doppler method through the ultrasound probe, and the signals are amplified; a computer signal processing module collects and processes the Doppler frequency shift signals to obtain a liquid drop free vibration characteristic pattern; the free vibration characteristic pattern is subjected to fitting to obtain the decay rate of the liquid drop amplitude along with the time; further, the liquid viscosity is obtained through calculation. When the method is used for measuring the liquid drop viscosity, the responsespeed is high; the application range is wide; the reliability is high; the equipment is portable; the cost performance is high; the reagent consumption is little.
Owner:TONGJI UNIV
Cerebral blood circulation dynamic analysis method and instrument
InactiveCN1593333AEasy to calculateQuick Test ResultsCatheterBlood flow measurementBlood vesselVessel diameter
The invention provides a method and apparatus for brain blood flow dynamic analysis, wherein a continuous wave Doppler blood flow rate waveform detecting module is utilized to carotid artery blood flow rate waveform and value, a pulse type supersonic carotid artery caliber detecting module is employed to detect the blood vessel diameter of the carotid artery, an arm type electronic blood pressure measurement module is used to obtain the human body blood pressure readings, and a simplified method is employed to calculate and analyze the cerebrovascular dynamic parameters. The invention can substantially improve the detecting and analyzing speed for the brain hemodynamic parameters, and greatly reduce the volume of the apparatus.
Owner:上海德安生物医学工程有限公司
Method and device for synthesizing simulation wave beam in continuous wave doppler modular
ActiveCN101147686ALow priceGood amplitude consistencyUltrasonic/sonic/infrasonic diagnosticsDigital data processing detailsLow noiseCapacitance
The present invention relates to a synthesis method of anolog wave beam in continuous wave Doppler module and its device. The described device includes a delay line LC network formed from inductor and capacitor and a resistor series-connected with the input end of the described delay line LC network for making magnitude compensation of inputted signal. The low-noise outputted multi-channel voltage signals are passed through the resistor series-connected with delay line to make signal magnitude compensation, after having been compensated said signals can be added into the LC network of delay line from different taps to make signal delay and signal accumulation, finally a wave beam synthesized signal can be outputted from output end of LC network.
Owner:SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD +1
Spectrum estimation method based on Doppler radar heartbeat detection
PendingCN113951856AQuick Heart Rate EstimationAccurate Heart Rate EstimationSensorsMeasuring/recording heart/pulse rateDigital signal processingLow noise
The invention provides a non-contact accurate heartbeat detection method based on a Doppler radar. The method comprises the following steps: firstly, capturing frequency shift caused by weak chest displacement due to human heart beating by adopting the principle of continuous wave Doppler radar sign detection, namely transmitting T(t) to a subject through a transmission end by Radar, and modulating the phase of the T (t) signal by the chest wall movement x (t) of the subject, and capturing a reflected signal by a radar receiving end; secondly, passing the reflection signal through a front-end low-noise amplifier to obtain a baseband signal, demodulating the baseband signal by adopting an orthogonal mixer, and acquiring a chest wall signal through arc tangent demodulation and winding calculation after the reflection signal passes through a gain amplifier; and finally, passing the chest wall analog signal through an analog-to-digital converter to obtain a digital signal x (t), processing the digital signal x(t), separating and extracting a heart signal at a PC end through a Marithan algorithm and a matched filtering algorithm, and performing FTPR-TWV algorithm to obtain a heartbeat spectrum result.
Owner:ZHEJIANG SCI-TECH UNIV
System For Determining Peripheral Artery Disease and Method of Use
ActiveUS20210052246A1Reduce the amount requiredBlood flow measurement devicesOrgan movement/changes detectionDiseaseTransceiver
A system for determining peripheral artery disease and method of use for determining the presence or absence of peripheral vascular disease and the severity of the disease in particular vascular segments. The System for determining peripheral artery disease and method of use includes a continuous wave Doppler transceiver which generates a digitized version of quadrature detected stereo audio and is coupleable to a waveform converter and processor. The waveform converter and processor provides filtering, time domain to frequency domain conversion, gain control, and statistical processing of the converted Doppler Stereo audio and is operationally coupled to a display for presenting results to a technician.
Owner:BLUEDOP MEDICAL
Non-contact accurate heart rate detection method based on 77GHz millimeter wave radar
PendingCN113854992AHigh detection sensitivityAccurate extractionSensorsMeasuring/recording heart/pulse rateFrequency spectrumDigital converter
The invention provides a non-contact accurate heart rate detection method based on a 77GHz millimeter wave radar. The method comprises the steps that firstly, the frequency shift caused by weak thoracic cavity displacement caused by human body heart beating is captured by adopting the continuous wave Doppler radar sign detection principle, that is, the radar transmits T (t) to a subject through a transmitting end; then the phase of a T (t) signal is modulated by the chest wall movement x (t) of the subject, and a reflected signal is captured by a radar receiving end; secondly, the reflected signal passes through a low-noise amplifier at the front end to obtain a baseband signal, the baseband signal is demodulated by adopting an orthogonal mixer, and after the baseband signal passes through a gain amplifier, a chest wall signal can be obtained through arc tangent demodulation and winding calculation; finally, a chest wall analog signal passes through an analog-digital converter to obtain a digital signal x (t), and after the digital signal is processed, a heartbeat spectrum result is obtained through a heartbeat signal extraction algorithm VMD and a heartbeat spectrum estimation algorithm CZT at a PC end.
Owner:ZHEJIANG SCI-TECH UNIV
CW Doppler Radar Sensor and Motion Demodulation Method Based on Subcarrier Modulation
ActiveCN105824020BSimple structureLow priceRadio wave reradiation/reflectionLocal oscillator signalPhase difference
The invention discloses a subcarrier-modulation-based continuous wave Doppler radar sensor and a motion demodulation method. A radio-frequency transceiver chip is connected with a control module; a clock distribution module is connected with the control module and the radio-frequency transceiver chip; and the radio-frequency transceiver chip has transmitting and receiving functions. After clock distribution of a crystal oscillator, two paths of low-frequency sinusoidal signals are generated and one path of signal is transmitted to the control module for digital modulation; the radio-frequency transceiver chip generates two paths of sinusoidal continuous wave radio-frequency carrier signals, one path of signal is a local oscillator signal, and the other path of signal and the low-frequency sinusoidal signals are mixed to generate a subcarrier signal for detection; after under sampling of an echo, the processed signal is transmitted to the control module; filter, mixing, and demodulation are carried and then an anti-trigonometric function is calculated to obtain phase information; a distance and relative displacement information are calculated based on a phase difference; and a motion track is recovered. According to the invention, defects of inherent direct-current excursion and scintillation noises of the traditional zero-intermediate-frequency architecture type receiver can be overcome. While the simple structure and low cost of the zero-intermediate-frequency receiver are kept, the image-frequency suppression function of which the traditional low-intermediate-frequency architecture type receiver is lack is also realized.
Owner:ZHEJIANG UNIV
Signal processing method for calibrating direct current offset of single-frequency continuous wave Doppler radar
PendingCN113589249AAccurate acquisitionWave based measurement systemsContinuous wave dopplerDescent algorithm
The invention discloses a signal processing method for calibrating direct-current offset of a single-frequency continuous-wave Doppler rada. The method comprises steps of determining the sampling frequency of a Doppler radar signal, and obtaining an IQ signal of the Doppler radar; performing down-sampling processing on the original data of the IQ signals of the Doppler radar in parallel to obtain radar data after down-sampling; performing signal real-time calibration based on an improved gradient descent algorithm on the down-sampled radar data, and when IQ direct current offset in a set error range is met, calibrating the radar data by using a Gramer-Schmidt orthogonalization formula to obtain calibrated arc data; phase information related to target motion being recovered from the calibrated IQ signal through an arc tangent demodulation algorithm; and obtaining the motion information of the target object according to the recovered phase information related to the target motion.
Owner:中山艾朗格科技有限公司
Doppler radar low-speed measurement method
ActiveCN110058221AReduce jitterGuaranteed stabilityRadio wave reradiation/reflectionICT adaptationCross-linkLow speed
The invention discloses a Doppler radar low-speed measurement method. The Doppler radar low-speed measurement method is mainly used for solving the problem that an existing continuous wave Doppler radar cannot measure the speed when an aerial carrier hovers and flies at the low speed. According to the realization scheme, the Doppler radar low-speed measurement method comprises the steps that 1, anantenna cover of a Doppler radar is thickened, the selected position of the edge of the antenna cover of the Doppler radar is coated with a matched wave-absorbing material, and the standing-wave ratio of a microstrip antenna and radio frequency transceiver cross-linking interface is controlled; 2, the wave-absorbing material is pasted on the upper part of a radio frequency transceiver of the Doppler radar; 3, an amplifying circuit in an intermediate-frequency receiver of the Doppler radar is adjusted, and the intermediate-frequency receiver is optimized; 4, the intermediate-frequency receiveris subjected to AGC control in a mode of combining a PID algorithm and a linear algorithm; 5, the radar wave beam switching period is prolonged; and 6, a low-speed signal of the aerial carrier is measured under the clearance measuring environment through the Doppler radar improved by the steps 1-5. According to the Doppler radar low-speed measurement method, the low-speed measurement ability of the continuous wave Doppler radar is improved, and the Doppler radar low-speed measurement method can be used for stale speed measurement during hovering or low-speed flying of an aircraft.
Owner:SHAANXI CHANGLING ELECTRONICS TECH
Pacemaker evaluation method and apparatus
InactiveUS20050245981A1Promote resultsBlood flow measurement devicesHeart stimulatorsUltrasound deviceContinuous wave doppler
A method of optimizing the performance of a cardiac prosthetic pacing device including monitoring, optionally transcutaneously or non-invasively, the flow output from the heart; optionally using a continuous wave Doppler ultrasound device, followed by adjusting the timing of said cardiac prosthetic pacing device so as to optimize the flow from the heart under operational condition, optionally including different pharmacological conditions.
Owner:USCOM
System for determining peripheral artery disease and method of use
ActiveUS20210030401A1Reduce the amount requiredBlood flow measurement devicesOrgan movement/changes detectionDiseaseTransceiver
A system for determining peripheral artery disease and method of use for determining the presence or absence of peripheral vascular disease and the severity of the disease in particular vascular segments. The System for determining peripheral artery disease and method of use includes a continuous wave Doppler transceiver which generates a digitized version of quadrature detected stereo audio and is coupleable to a waveform converter and processor. The waveform converter and processor provides filtering, time domain to frequency domain conversion, gain control, and statistical processing of the converted Doppler Stereo audio and is operationally coupled to a display for presenting results to a technician.
Owner:BLUEDOP MEDICAL
Doppler full-process quantitative analysis method and device, electronic equipment and storage medium
PendingCN114255226AImprove accuracyRealize the whole process automation analysisImage enhancementImage analysisContinuous wave dopplerRadiology
The invention relates to a Doppler full-process quantitative analysis method and device, electronic equipment and a storage medium. The method comprises the following steps: receiving an input user interface image of Doppler spectrum imaging; determining a modal recognition result and a part recognition result of the user interface image; performing quantitative analysis of motion information on the user interface image according to the modal recognition result and the part recognition result; wherein the modal identification result comprises one of pulse wave Doppler, continuous wave Doppler and tissue Doppler. According to the embodiment of the invention, the accuracy of the target object motion information obtained through analysis can be improved, and the full-process automatic quantitative analysis of the Doppler image is realized.
Owner:BEIJING ANDE YIZHI TECH CO LTD
Stand-alone cw doppler probe interface for phased array ultrasound system
InactiveUS20090099453A1Blood flow measurement devicesInfrasonic diagnosticsCW DopplerContinuous wave doppler
A stand-alone continuous wave (CW) Doppler probe (CW probe) comprises a scanning end that has a single transmit element and a single receive element. A connector has probe connecting elements configured to interface with port connecting elements of a probe port that is provided on an ultrasound system. The port connecting elements are configured to connect with system channels of the ultrasound system. Transmit circuitry connects a first set of the probe connecting elements in parallel, and the transmit circuitry is interconnected with the transmit element. Receive circuitry connects a second set of the probe connecting elements in parallel, and the receive circuitry is interconnected with the receive element.
Owner:GENERAL ELECTRIC CO
Object Movement Pattern Recognition Method Based on Multi-Channel Continuous Wave Doppler Radar
ActiveCN106405520BSolving Phase Blur ProblemsImprove recognition accuracyWave based measurement systemsObject motionLinearity
The present invention provides an object motion identification method based on a multi-channel continuous-wave Doppler radar. One antenna is employed to emit electromagnetic wave to irradiate the surface of a motion object to be measured, the reflected signals are received by 2-3 receiving antennas and are subjected to down conversion to a base band, the arcsine algorithm is employed to demodulate the phase information without the phase ambiguity limitation, the distance changing information between each receiving antenna and the motion object is obtained, the track formula is employed to obtain the object's motion track, and the mode identification is performed on the basis of the motion track. The object motion identification method based on the multi-channel continuous-wave Doppler radar can avoid the phase ambiguity problem of the arc tangent class function, is applied to the work condition with high the sampling rate and work condition with the low sampling rate and keeps the accuracy in the condition with the low sampling rate. The mode identification is realized on the basis of location and tracking of the object to be measured. The identification accuracy is high, the anti-interference capability is high, the configuration is simple, and the cost is low, the most of the demodulated motions are the linear relation with no need for the complex data processing process, and the hardware resource is saved.
Owner:ZHEJIANG UNIV
Double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias
InactiveCN109239671AIncrease profitHigh precisionRadio wave reradiation/reflectionAudio power amplifierContinuous wave doppler
The invention discloses a double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias. A receiving antenna is connected with a fourth power divider; one path ofan output end of the fourth power divider is serially connected with a first band-pass filter, a first low-noise amplifier, a first mixer, a fifth band-pass filter and a first analog-to-digital converter, and the other path of the output end of the fourth power divider is serially connected with a second band-pass filter, a second low-noise amplifier, a second mixer, a sixth band-pass filter anda second analog-to-digital converter; the first analog-to-digital converter and the second analog-to-digital converter both are connected to a field-programmable gate array; a transmitting antenna isserially connected with a power amplifier and a second power divider; an input end of the second power divider is connected with a third power divider; a first power divider is connected to a first local oscillator, and one path of an output end of the first power divider is connected to the second power divider, and the other path of the output end of the first power divider is connected to the first mixer via a third band-pass filter; and the third power divider is connected to a second local oscillator, and one path of an output end of the third power divider is connected to the second power divider, and the other path of the output end of the third power divider is connected to the second mixer via the fourth band-pass filter.
Owner:TIANJIN UNIV
Continuous wave doppler detection of rosc
InactiveUS20170231600A1Organ movement/changes detectionHeart defibrillatorsContinuous wave dopplerContinuous wave
An event-driven medical treatment data notification system is disclosed. Embodiments are directed to a treatment protocol for detecting Return of Spontaneous Circulation by employing a Doppler effect analysis on a signal transmitted at a patient's heart. A reflected signal is evaluated to determine if the patient's heart is moving, thereby indicating that the patient's heart is beating and, therefore, that blood is flowing.
Owner:PHYSIO CONTROL INC
Combined blood flow and pressure monitoring system and method
A method of blood flow monitoring for a patient, the method comprising the steps of: a) receiving a first signal indicative of the real time cardiac output for the patient; b) processing the continuous wave Doppler signal to provide an estimate of blood flow velocity as a function of time; c) receiving a pressure measurement indicative of the blood flow resistance through the patient; and d) calculating an Inotropy measure indicative of the potential and kinetic energy of the cardiac output of the patient.
Owner:USCOM LTD
A Liquid Viscosity Test Method Based on Droplet Mechanical Vibration
ActiveCN108007825BReduce dosageGood value for moneyFlow propertiesVibration amplitudeLiquid viscosity
Owner:TONGJI UNIV
Fully Coherent Continuous Wave Doppler Radar and Its Range and Velocity Measurement Method
ActiveCN106405541BWith no distance blind spot rangingEliminate the effects ofRadio wave reradiation/reflectionFrequency modulationLow power dissipation
The invention discloses a fully coherent continuous wave Doppler radar and its distance measurement and speed measurement method. First, the difference frequency complex signal obtained by mixing the echo signal and the transmission signal is obtained, and according to the range frequency-Doppler frequency and the target distance ‑Modulation characteristics of velocity, using the two-dimensional joint detection method of distance dimension FFT + azimuth dimension MTD, using multiple coherent high repetition frequency modulation signals to independently obtain unambiguous radial velocity information, and then introduce the velocity into the Doppler The information is removed in the distance dimension and frequency domain information to eliminate the influence of distance-velocity coupling, so as to further obtain accurate distance information. The invention has the characteristics of coherent radar speed measurement and continuous wave radar distance measurement without distance blind zone, and meets the requirements of no distance blind zone, simultaneous distance measurement and speed measurement, real-time performance, miniaturization, and low power consumption.
Owner:SUZHOU TUSHI ELECTRONICS TECH CO LTD
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