241results about How to "Accurate distance measurement" patented technology

A method for measuring distances of targets by measuring the time of flight of pulses, in particular laser pulses, reflected on those targets, including the steps of; transmitting pulses having a pulse interval which varies according to a modulation signal as transmitted pulses, and concomitantly recording of reflected pulses as received pulses; determining a first series of distance measurement values from times of flight between transmitted pulses and those received pulses which are respectively received within a first time window following each transmitted pulse; determining at least a second series of distance measurement values from times of flight between transmitted pulses and those received pulses which are respectively received within a second time window following each transmitted pulse; and determining that series of distance measurement values which is least affected by the modulation signal as result of the distance measurement.

A measuring device, comprising, (a) an ultrasonic acoustic transceiver unit capable of sending and receiving acoustic signals into the body of a patient; (b) frequency modulating circuitry which drives said transceiver unit with a signal whose frequency varies with time; and (c) processing circuitry which extracts an indication of a distance, from at least one signal detected by said transceiver unit, said signal being a reflection of a transmission of said transceiver unit driven by said time varying frequency signal. Optionally, the indication is a distance between walls of a bladder.

Two different wireless protocols can be used for ranging between a mobile device and an access control system (e.g., a vehicle). The first wireless protocol (e.g., Bluetooth®) can be used to perform authentication of the vehicle and exchange ranging capabilities between a mobile device (e.g., a phone or watch) and the vehicle. The second wireless protocol (e.g., ultra-wideband, UWB) can use a pulse width that is less than a pulse width used by the first wireless protocol (e.g., 1 ns v. 1 μs). The narrower pulse width can provide greater accuracy for distance (ranging) measurements.

The invention relates to a chaotic signal transmitter using a pulse shaping method to amplitude-modulate a chaotic signal according to a transmission signal, thereby transmitting the chaotic signal having various slopes. The chaotic signal transmitter includes a waveform converter for blocking high frequency component of the transmission signal to convert the waveform of the transmission signal and a chaotic signal generator for generating the chaotic signal. The chaotic signal transmitter further includes a modulator for amplitude-modulating the chaotic signal according to the waveform-converted transmission signal.

This invention describes the detection of atherosclerotic plaque or cancer cells by a light probe inside a blood vessel or internal to an elongate organ. In one embodiment, vessel wall is imaged by employing a scanning mechanism using one emitting and one receiving fiber, whereby light is directed at a spinning mirror, approximately normal to the vessel or elongate organ surface. The light is reflected circumferentially around the vessel or elongate organ surface as the mirror rotates and received by a low-numerical aperture (NA) fiber, which transmits it to a light detector, thereby generating a set of light amplitudes circumferentially around the vessel/elongate organ surface. Multiple rings are acquired by translating the probe within the vessel/elongate organ. In another embodiment, adding a piezoelectric transducer in proximity to the distal ends of the fibers permits simultaneous ultrasound and light images to be created.

A skin-marking device is disclosed that has a holder body and cap having a shape other than round, preferably triangular, to prevent the device from accidentally rolling off a flat surface. Measuring indicia is disposed on the device for accurately measuring distances. The device contains a dermatologically acceptable coloring agent for marking a patient's skin and one that may be selected from the group consisting of a radioopaque substance for x-ray diagnostic purposes, a fluorescent composition, a non-magnetic hydrogel for nuclear magnetic resonance imaging diagnostic purposes, a sterilizable gel ink, a combination of any of these, and a mixture of any of these. The holder body or cap may include a pocket clip or magnet attached thereto to permit the skin marker to be clipped inside a person's pocket or prevented from sliding off a magnetic drape or other magnetic surface, respectively. The skin marker may also come in a number of different sizes, one of which is optionally short enough to allow it to fit into a needle counter box to be packaged as part of a mini kit.

An elongated substantially flat four-conductor moisture detection and location sensor is described. The sensor includes four parallel conductors laminated to a dielectric substrate. Two of the conductors are protected by a water pervious dielectric layer and form the water-sensing element. Two other conductors are covered by a water impervious dielectric layer and are used to loop-back one or more of the water-sensing conductors. Precise location of a water leak location is determined by connecting the four conductors to a resistance bridge. The design allows for the connection of a four-conductor cable to extend the monitoring and detection point to a convenient location without loss of location accuracy.

There is provided a radio communication system capable of distinguishing objects from one another while taking advantage of the low power consumption and distance measurement ability of the radio communication of the UWB method. A radio tag TGn includes: a characteristic impedance unit (3) for generating a response signal by using a pulse signal received from a broad-band antenna (1); a transmission path (2) having a predetermined length, transmitting the pulse signal received by the broad-band antenna (1) from the broad-band antenna (1) to the characteristic impedance unit (3), and transmitting the generated response signal from the characteristic impedance unit (3) to the broad-band antenna (1); and the broad-band antenna (1) for receiving the pulse signal and transmitting the response signal. The aforementioned pulse wave is transmitted to the radio tag TGn by the UWB method. The response signal from the radio tag TGn is received and the radio tag TGn is identified from the reception waveform.

An apparatus comprises a test signal generator (401) which generates an ultrasonic test signal by modulating an audio band test signal on an ultrasonic signal. The ultrasonic test signal is radiated from a parametric loudspeaker (403) and is demodulated by non-linearities in the air. A reflected audio signal may arise from reflections of an object, such as a wall. An audio band sensor (405) generates an audio band captured signal which comprises the demodulated reflected audio band signal. A distance circuit (407) then generates a distance estimate for the distance from the parametric loudspeaker (403) to the object in response to a comparison of the audio band captured signal and the audio band test signal. Specifically two signals may be correlated to determine a delay corresponding to the full path length. Based on the distance estimates an audio environment may be estimated and a sound system may be adapted accordingly.

The invention discloses a dynamic positioning method and device based on UWB and laser ranging combination and belongs to dynamic positioning methods and devices. The dynamic positioning device comprises an ultra-wide band (UWB) wireless communication sensors, a UWB positioning label, laser ranging sensors, an upper computer and a POE interchanger. An ultra-wide band (UWB) wireless communication sensor station is arranged in an area to be detected, the laser ranging sensors are installed on and fixed to the ultra-wide band (UWB) wireless communication sensors, the UWB positioning label is fixed to a target to be detected, and the ultra-wide band (UWB) wireless communication sensors and the laser ranging sensors are connected with the upper computer through the POE interchanger. According to the dynamic positioning method and device based on the UWB and laser ranging combination, the laser ranging sensors are arranged on the ultra-wide band (UWB) wireless communication sensors respectively, so that the relative distance between every two adjacent ultra-wide band (UWB) wireless communication sensors is obtained, in this way, the coordinates of the ultra-wide band (UWB) wireless communication sensors can be re-determined or corrected after the ultra-wide band (UWB) wireless communication sensors are moved, and thus the requirement for dynamic positioning is met. The dynamic positioning method and device based on the UWB and laser ranging combination have the advantages that the dynamic positioning method based on the UWB and laser ranging combination is adopted, positioning is accurate, safety and reliability are guaranteed, installation is easy, and operation is convenient.

A distance measuring system and method employing a laser distance sensor may have utility in various applications. In accordance with one aspect of the present invention, a laser distance sensor may acquire accurate distance measurements with a short baseline.

The invention belongs to navigation methods and particularly relates to a method for combined navigation of an inertia/visual odometer/laser radar. The method comprises (1) state model establishment, (2) visual odometer speed measurement based on characteristic information, (3) establishment of a measurement equation and obtaining of a measurement value, (4) Kalman filtering and (5) system error correction. The method has the advantages that a machine vision autonomous navigation technology is used, a monocular camera can measure a vector speed under the conditions of a known distance through the difference of a front frame image and a rear frame image, the laser radar can accurately measure the distance of an observation point and then measure a vector speed, navigation is performed by utilizing combination of the speed obtained through measurement and an inertial reference speed, and high-accuracy navigation is performed finally under the conditions of no outside reference information.

The application discloses a method for measuring distance of double-camera. The method comprises the following steps: simultaneously obtaining an image of a target object through the two cameras when a mobile apparatus is used for measuring distance, when receiving a target point on an input image obtained by a camera, determining a position of an imaging point of the target point on the image obtained by other camera so as to compute the distance from the target object to the mobile apparatus. Based on the same inventive concept, the application further provides a device for accurately measuring the distance from the mobile apparatus to the target object.

A system and method for accurate measurement of distance and location of an object. The system comprises low-cost optical signal generators, aligned in a known configuration, to project a two-dimensional geometric figure on the object to be measured, or on a target attached to the object. The system captures an image of the projected figure, determines the exact geometry (e.g., area or circumference) of the figure, and calculates the exact distance to the object based on comparison of that geometry to the known configuration of the laser line generators. The invention simultaneously determines relative X and Y position of the object, thereby giving accurate X, Y, and Z coordinates.

Systems, methods, and computer program products are provided for accurately measuring frequency-and/or-phase-related parameters of a sinusoidal signal that varies non-linearly in frequency or phase. A sinusoidal signal is sampled over a finite period of time at a plurality of sample points. The sampled signals are pre-processed, and a Fourier transform is performed on the pre-processed sampled signals. Phases of the pre-processed sampled signals are extracted from the Fourier transform, and a measurement indicative of frequency of the sinusoidal signal is determined from slope of the phases of the pre-processed sampled signals. Range to a target may be determined using the exemplary signal processing described above on laser radar interference signals.

A laser distance measuring apparatus, for measuring the distance between objects existing in two directions at least as seen from the apparatus by using laser light, comprises two projectors for projecting laser beams along a specified projection axis toward each one of the objects, a photo detector for receiving reflected light of projection from each object, a distance measurement processor for measuring the distance from a reference point of the apparatus to each object on the basis of the reception signal to the projection by the photo detector, and a distance calculation processor for calculating the distance between the objects on the basis of the distance data measured by the distance measurement processor and the angle formed by two projection axes, in which the projection axis by one projector is variable in angle with respect to the other projector. Therefore, the distance between objects can be measured easily and at high precision by one distance measuring operation only.

A method for detecting an intruder in a protected space that uses a microwave frequency sensor to determine an accurate distance measurement to the intruder. The accurate distance measurement reduces the false alarms typically associated with microwave frequency sensors due to motion outside the protected space and vibration within the protected space. The motion detector transmits three microwave frequency signals of different frequencies in order to eliminate an ambiguity problem when determining the accurate distance measurement. The accuracy of the intruder distance measurement may be determined with greater resolution by reiteratively transmitting and evaluating microwave frequency signals of different frequencies. The motion detector of the present invention may include a PIR sensor. The accurate distance measurement allows the motion detector to precisely set signal threshold levels for the microwave frequency detector and the passive infrared detector to reliably detect an intruder while discriminating against an animal or other moving object.

A ranging system is disclosed which measures a distance between terminals operating on a multi-carrier transmission system. The ranging system includes a frequency domain data processing device that acquires impulse responses by subjecting data from transmitted and/or received packets to fast discrete Fourier transform for conversion into frequency domain data subject to a predetermined process and by applying a spectrum estimation algorithm to the processed frequency domain data.

In a specific embodiment, this invention includes a method for determining an accurate, consensus pharmacophore structure shared by compounds that bind selectively to a target molecule. Optionally, the method begins with screening a diversity library against the target molecule of interest to pick the selectively binding members. Next the structure of the selected members is examined and a candidate pharmacophore responsible for the binding to the target molecule is determined. Next, preferably by REDOR nuclear magnetic resonance, several highly accurate interatomic distances are determined in certain of the selected members which are related to the candidate pharmacophore. A highly accurate consensus, configurational bias, Monte Carlo method determination of the structure of the candidate pharmacophore is made using the structure of the selected members and incorporating as constraints the shared candidate pharmacophore and the several measured distances. This determination is adapted to efficiently examine only relatively low energy configurations while respecting any structural constraints present in the organic diversity library. If the diversity library contains short peptides, the determination respects the known degrees of freedom of peptides as well as any internal constraints, such as those imposed by disulfide bridges. Finally, the highly accurate pharmacophore so determined is used to select lead organics for drug development targeted at the initial target molecule.

A method and apparatus for determining range of a radar target is provided. Signal samples based on returns of a target during tracking are processed to produce a wideband envelope range estimate for components of target motion. The components of target motion include precession and spin motion. Ambiguous phase values are measured. An unambiguous phase value indicative of range is produced from the wideband envelope range estimate and measured ambiguous phase values.

The optical sensor according to an embodiment disclosed herein includes: a lighting unit; a color photographing element for obtaining a color image in the sensing region; a photographing control unit for controlling a light irradiating time; a memory unit for storing a color image and a resultant image; a measurement light image extracting unit for processing the color image or the resultant image; a distance calculating unit for calculating distance or location information of the object; and a color correcting unit for calculating corrected distance or location information of the object.

An echo-signal monitoring device having a plurality of transceiver units for transmitting signals and receiving the echoes reflected by an external object and an analyzer unit for estimating the distance from the monitoring device to the external object on the basis of the received echoes is characterized in that the device has an operating mode for calculating the relative position of the transceiver units from one another on the basis of the reflected echoes.

A cooperative adaptive lighting system for motor vehicles in which a vehicle transmits its geographic coordinates and receives similar coordinates from other vehicles, pedestrians, and stationary warning devices. Using the coordinates, the vehicle computes distances, and relative position more specifically, to those entities. When the distances become sufficiently small, indicating that the entities fall within headlight range, the vehicle alters its headlight beams to either (1) throw more light on an entity, (2) reduce light reaching the entity as appropriate, or (3) change a lighting pattern as appropriate.

A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.