146 results about "Multiple echo" patented technology

The present invention is a man-portable counter-mortar radar (MCMR) radar system that detects and tracks enemy mortar projectiles in flight and calculates their point of origin (launch point) to enable and direct countermeasures against the mortar and its personnel. In addition, MCMR may also perform air defense surveillance by detecting and tracking aircraft, helicopters, and ground vehicles. MCMR is a man-portable radar system that can be disassembled for transport, then quickly assembled in the field, and provides 360-degree coverage against an enemy mortar attack. MCMR comprises an antenna for radiating the radar pulses and for receiving the reflected target echoes, a transmitter that produces the radar pulses to be radiated from the antenna, a receiver-processor for performing measurements (range, azimuth and elevation) on the target echoes, associating multiple echoes to create target tracks, classifying the tracks as mortar projectiles, and calculating the probable location of the mortar weapon, and a control and display computer that permits the operation of the radar and the display and interpretation of the processed radar data.

The invention relates to a satellite-borne multi-channel synthetic aperture radar imaging device, which is characterized in that multiple channels of pitching direction receiving antenna assemblies are arranged in the pitching direction of the radar at equal distance, echoes received by the multiple channels of pitching direction receiving antenna assemblies are formed into a channel of echo signal after passing through pitching direction digital beam forming units, multiple channels of pitching direction receiving antennas corresponding to the channel of echo signal are used as a row of receiving antennas, multiple rows of azimuth receiving antenna assemblies are arranged in the azimuth of the radar, multiple echo signals are formed after the multiple rows of azimuth receiving antenna assemblies pass through respective digital beam forming units, and enter azimuth frequency spectrum reestablishing units to be subjected to azimuth frequency spectrum reestablishing, the azimuth frequency spectrum reestablishing units are respectively connected with the multiple channels of pitching direction digital beam forming units for carrying out azimuth frequency spectrum reestablishing on the multiple channels of echo signals to generate and output a synthetic aperture radar echo signal, and an imaging device is connected with the azimuth frequency spectrum reestablishing units, and is used for receiving and generating the synthetic aperture radar echo signal into a synthetic aperture radar image.

A method and an apparatus for recognizing a parking area are disclosed. The parking area recognizing apparatus includes: a signal transmitter transmitting a signal using a sensor; an echo signal receiver receiving an echo signal for the signal; a multiple signal generator generating a multiple echo signal using the echo signal based on first and second preset thresholds; and a parking area recognizer recognizing a parking area by calculating a round trip time and a duration time for the multiple echo signal and selecting an available echo signal based on at least one of the round trip time and the duration time. Accordingly, a precision in recognition of a parking area is enhanced by reducing a measurement error by processing an echo signal received after it is reflected on an object with a multiple echo signal in recognition of the parking area using a sensor such as an ultrasonic sensor or a radar sensor.

The invention discloses a three-dimensional imaging method based on a single detector correlated imaging theory. In the method, a digital processor controls a pulse laser to emit intense pulsed light, which is optically processed into the intense pulsed light with a known spatial pattern for irradiating to a spatial optical modulator, and the spatial optical modulator generates a pseudorandom additive phase position for the incident intense pulsed light, wherein the distribution of the pseudorandom additive phase position is known and has been stored already for the subsequent processing of the digital processor; the intense pulsed light passes through an illumination beam expansion system after passing through the spatial optical modulator, irradiates to a target and is reflected, and then is condensed to a high-speed single-point light intensity detector by a condenser lens; detector signals are transmitted to the digital processor after A / D (Analog to Digital) conversion; and after a plurality of times of detection, the digital processor processes the collected information and the stored pseudorandom distribution phase positions to finally produce a three-dimensional image. The method disclosed by the invention can be used for acquiring the three-dimensional information of the target at high speed, and has the advantages of capability of acquiring multiple echo target signals, long detection distance and the like.

The invention discloses a laser non-visual-field three-dimensional imaging scene modeling method based on a point cloud model. The method comprises the following steps of firstly, setting non-visual-field scene space parameters, imaging system parameters and imaging index parameters, and determining a visible region of a specified scanning point-to-point cloud target; secondly, segmenting the visible region point cloud into a plurality of micro-point clouds by utilizing space voxels; detecting angular points to form micro-surface elements, estimating the region, the centroid and the surface normal of each micro-surface element, and establishing an energy transmission model of signals emitted from a laser through three times of diffuse reflection and received by a detector in combination with imaging system parameters to obtain echo energy and echo photon distribution histograms, and finally, setting different scanning points, and repeating the above steps to obtain a photon distribution histogram of multiple echo signals. The modeling method is advantaged in that the process that signals are emitted from a laser, subjected to three times of diffuse reflection of an intermediate surface and a point cloud target with three-dimensional characteristics and finally detected and counted is simulated for the first time.

A fast, efficient, qualitatively high-grade shim is enabled in a magnetic resonance apparatus and a method to set shim parameters of a magnetic resonance apparatus, to prepare the implementation of a magnetic resonance examination of a patient with an imaging medical magnetic resonance apparatus having a displaceable patient bed, wherein an examination region of the patient that is to be examined is larger than an imaging region of the magnetic resonance apparatus.Field inhomogeneities are measured while the examination region is moved through the imaging region by a continuous displacement of the patient bed with the patient positioned thereon. Information representing field inhomogeneities (B0 map) is acquired at multiple positions of the patient bed from respective magnetic resonance signals received at these positions. Information representing field inhomogeneities is acquired by excitation of multiple respective slices before the readout of the echo of the first of these slices, with one echo train composed of multiple echoes being generated per excitation signal.Shim parameters of the magnetic resonance apparatus are adjusted dependent on the measured information.A magnetic resonance examination of the examination region is implemented with the apparatus shimmed according to the shim parameters.

A fill-level measuring device includes a self-learn device that is able to automatically determine the length of the dome shaft of the container. To this effect the self-learn device uses a multiple echo classified as such by a multiple-echo detection device. In this manner the result of fill level measuring may be improved.

The invention discloses a frequency modulated continuous wave radar level meter of 120 GHz and a distance measurement method. The radar level meter comprises a frequency modulating module, an intermediate frequency signal conditioning and sampling module, an echo signal processing module, a threshold value curve generation module and a spectrum estimation module; the frequency modulating module isarranged to be used for generating a difference frequency in-phase signal IF_I and a difference frequency orthogonal signal IF_Q of sending frequency TX and receiving frequency RX; the intermediate frequency signal conditioning and sampling module is arranged to be used for sequentially processing the difference frequency in-phase signal IF_I and the difference frequency orthogonal signal IF_Q togenerate digitalized intermediate frequency orthogonal signals IF_I' and IF_Q'; the echo signal processing module is arranged to be used for converting the intermediate frequency orthogonal signals IF_I' and IF_Q' as time domain signals into a frequency spectrum curve; the threshold value curve generation module is arranged to be used for dynamically generating a threshold value curve according to the generated frequency spectrum curve so that multiple echoes can be obtained. The frequency modulated continuous wave radar level meter of 120 GHz has the advantages that the area of a measurementblind region is small, and precision is high.

Exemplary method, systems and arrangements can be provided for creating a high-resolution magnetic resonance image (“MRI”) or obtaining other information of a target. For example, radio-frequency (“RF”) pulses can be transmitted toward the target by a RF transmitter of a MRI apparatus. In response, multiple echoes corresponding to each pulse may be received from the target. Data from each of the echoes can be assigned to a single line of k-space of a distinct image, and stored in memory of the apparatus. An image of the target, velocity data and / or acceleration data associated with a target can be generated as a function of the data. In one exemplary embodiment, the data from different echoes can be assigned to the same k-space line and to different cardiac phases. The exemplary embodiments of the present disclosure can be utilized for the heart or for any other anatomical organ or region of interest.

Measurements of functional, hemographic, and blood flow parameters use a multiple echo or spin echo gradient pulse sequence whereby an early echo is acquired near the beginning of the pulse sequence which avoids saturation effects and a later echo near the end of the pulse sequence which can provide information with more sensitivity to a contrast agent for a susceptibility weighted image.

The invention describes an evaluation device (701) and a method for determining a characteristic variable (dL) for the position of a boundary surface (105, 108) in a container (109, 501, 601), wherein multiple echoes (207, 209, 405, 611) including at least one stage (N, N1, N2) is identified in the echo curve (204, 427), wherein the characteristic variable (dL) of the boundary surface in the container is determined based on the positions (DML1, DML2, DMB1) of the multiple echoes and the stages (N, N1, N2)of the multiple echoes.

A fast, efficient, qualitatively high-grade shim is enabled in a magnetic resonance apparatus having a displaceable patient bed and an examination region of the patient that is to be examined is larger than an imaging region of the magnetic resonance apparatus. Field inhomogeneities are measured while the examination region is moved through the imaging region by a continuous displacement of the patient bed with the patient positioned thereon. Information representing field inhomogeneities is acquired at multiple positions of the patient bed from respective magnetic resonance signals received at these positions, by excitation of multiple respective slices before the readout of the echo of the first of these slices, with one echo train composed of multiple echoes being generated per excitation signal. Shim parameters of the magnetic resonance apparatus are adjusted dependent on the measured information.

A method for inversion of multiple echo trains with different wait times uses a cutoff times for each of the echo trains for full polarization. Simultaneous inversion is carried out for T2 bins where full polarization exists